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3314 lines
98 KiB
C
3314 lines
98 KiB
C
/* BFD back-end for mmo objects (MMIX-specific object-format).
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Copyright (C) 2001-2014 Free Software Foundation, Inc.
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Written by Hans-Peter Nilsson (hp@bitrange.com).
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Infrastructure and other bits originally copied from srec.c and
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binary.c.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/*
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SECTION
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mmo backend
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The mmo object format is used exclusively together with Professor
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Donald E.@: Knuth's educational 64-bit processor MMIX. The simulator
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@command{mmix} which is available at
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@url{http://mmix.cs.hm.edu/src/index.html}
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understands this format. That package also includes a combined
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assembler and linker called @command{mmixal}. The mmo format has
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no advantages feature-wise compared to e.g. ELF. It is a simple
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non-relocatable object format with no support for archives or
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debugging information, except for symbol value information and
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line numbers (which is not yet implemented in BFD). See
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@url{http://mmix.cs.hm.edu/} for more
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information about MMIX. The ELF format is used for intermediate
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object files in the BFD implementation.
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@c We want to xref the symbol table node. A feature in "chew"
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@c requires that "commands" do not contain spaces in the
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@c arguments. Hence the hyphen in "Symbol-table".
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@menu
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@* File layout::
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@* Symbol-table::
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@* mmo section mapping::
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@end menu
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INODE
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File layout, Symbol-table, mmo, mmo
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SUBSECTION
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File layout
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The mmo file contents is not partitioned into named sections as
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with e.g.@: ELF. Memory areas is formed by specifying the
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location of the data that follows. Only the memory area
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@samp{0x0000@dots{}00} to @samp{0x01ff@dots{}ff} is executable, so
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it is used for code (and constants) and the area
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@samp{0x2000@dots{}00} to @samp{0x20ff@dots{}ff} is used for
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writable data. @xref{mmo section mapping}.
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There is provision for specifying ``special data'' of 65536
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different types. We use type 80 (decimal), arbitrarily chosen the
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same as the ELF <<e_machine>> number for MMIX, filling it with
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section information normally found in ELF objects. @xref{mmo
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section mapping}.
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Contents is entered as 32-bit words, xor:ed over previous
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contents, always zero-initialized. A word that starts with the
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byte @samp{0x98} forms a command called a @samp{lopcode}, where
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the next byte distinguished between the thirteen lopcodes. The
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two remaining bytes, called the @samp{Y} and @samp{Z} fields, or
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the @samp{YZ} field (a 16-bit big-endian number), are used for
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various purposes different for each lopcode. As documented in
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@url{http://mmix.cs.hm.edu/doc/mmixal.pdf},
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the lopcodes are:
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@table @code
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@item lop_quote
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0x98000001. The next word is contents, regardless of whether it
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starts with 0x98 or not.
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@item lop_loc
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0x9801YYZZ, where @samp{Z} is 1 or 2. This is a location
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directive, setting the location for the next data to the next
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32-bit word (for @math{Z = 1}) or 64-bit word (for @math{Z = 2}),
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plus @math{Y * 2^56}. Normally @samp{Y} is 0 for the text segment
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and 2 for the data segment. Beware that the low bits of non-
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tetrabyte-aligned values are silently discarded when being
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automatically incremented and when storing contents (in contrast
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to e.g. its use as current location when followed by lop_fixo
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et al before the next possibly-quoted tetrabyte contents).
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@item lop_skip
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0x9802YYZZ. Increase the current location by @samp{YZ} bytes.
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@item lop_fixo
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0x9803YYZZ, where @samp{Z} is 1 or 2. Store the current location
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as 64 bits into the location pointed to by the next 32-bit
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(@math{Z = 1}) or 64-bit (@math{Z = 2}) word, plus @math{Y *
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2^56}.
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@item lop_fixr
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0x9804YYZZ. @samp{YZ} is stored into the current location plus
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@math{2 - 4 * YZ}.
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@item lop_fixrx
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0x980500ZZ. @samp{Z} is 16 or 24. A value @samp{L} derived from
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the following 32-bit word are used in a manner similar to
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@samp{YZ} in lop_fixr: it is xor:ed into the current location
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minus @math{4 * L}. The first byte of the word is 0 or 1. If it
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is 1, then @math{L = (@var{lowest 24 bits of word}) - 2^Z}, if 0,
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then @math{L = (@var{lowest 24 bits of word})}.
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@item lop_file
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0x9806YYZZ. @samp{Y} is the file number, @samp{Z} is count of
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32-bit words. Set the file number to @samp{Y} and the line
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counter to 0. The next @math{Z * 4} bytes contain the file name,
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padded with zeros if the count is not a multiple of four. The
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same @samp{Y} may occur multiple times, but @samp{Z} must be 0 for
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all but the first occurrence.
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@item lop_line
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0x9807YYZZ. @samp{YZ} is the line number. Together with
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lop_file, it forms the source location for the next 32-bit word.
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Note that for each non-lopcode 32-bit word, line numbers are
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assumed incremented by one.
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@item lop_spec
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0x9808YYZZ. @samp{YZ} is the type number. Data until the next
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lopcode other than lop_quote forms special data of type @samp{YZ}.
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@xref{mmo section mapping}.
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Other types than 80, (or type 80 with a content that does not
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parse) is stored in sections named <<.MMIX.spec_data.@var{n}>>
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where @var{n} is the @samp{YZ}-type. The flags for such a
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sections say not to allocate or load the data. The vma is 0.
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Contents of multiple occurrences of special data @var{n} is
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concatenated to the data of the previous lop_spec @var{n}s. The
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location in data or code at which the lop_spec occurred is lost.
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@item lop_pre
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0x980901ZZ. The first lopcode in a file. The @samp{Z} field forms the
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length of header information in 32-bit words, where the first word
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tells the time in seconds since @samp{00:00:00 GMT Jan 1 1970}.
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@item lop_post
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0x980a00ZZ. @math{Z > 32}. This lopcode follows after all
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content-generating lopcodes in a program. The @samp{Z} field
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denotes the value of @samp{rG} at the beginning of the program.
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The following @math{256 - Z} big-endian 64-bit words are loaded
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into global registers @samp{$G} @dots{} @samp{$255}.
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@item lop_stab
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0x980b0000. The next-to-last lopcode in a program. Must follow
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immediately after the lop_post lopcode and its data. After this
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lopcode follows all symbols in a compressed format
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(@pxref{Symbol-table}).
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@item lop_end
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0x980cYYZZ. The last lopcode in a program. It must follow the
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lop_stab lopcode and its data. The @samp{YZ} field contains the
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number of 32-bit words of symbol table information after the
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preceding lop_stab lopcode.
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@end table
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Note that the lopcode "fixups"; <<lop_fixr>>, <<lop_fixrx>> and
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<<lop_fixo>> are not generated by BFD, but are handled. They are
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generated by <<mmixal>>.
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EXAMPLE
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This trivial one-label, one-instruction file:
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| :Main TRAP 1,2,3
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can be represented this way in mmo:
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| 0x98090101 - lop_pre, one 32-bit word with timestamp.
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| <timestamp>
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| 0x98010002 - lop_loc, text segment, using a 64-bit address.
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| Note that mmixal does not emit this for the file above.
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| 0x00000000 - Address, high 32 bits.
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| 0x00000000 - Address, low 32 bits.
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| 0x98060002 - lop_file, 2 32-bit words for file-name.
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| 0x74657374 - "test"
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| 0x2e730000 - ".s\0\0"
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| 0x98070001 - lop_line, line 1.
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| 0x00010203 - TRAP 1,2,3
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| 0x980a00ff - lop_post, setting $255 to 0.
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| 0x00000000
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| 0x00000000
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| 0x980b0000 - lop_stab for ":Main" = 0, serial 1.
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| 0x203a4040 @xref{Symbol-table}.
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| 0x10404020
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| 0x4d206120
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| 0x69016e00
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| 0x81000000
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| 0x980c0005 - lop_end; symbol table contained five 32-bit words. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "libiberty.h"
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#include "elf/mmix.h"
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#include "opcode/mmix.h"
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#define LOP 0x98
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#define LOP_QUOTE 0
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#define LOP_LOC 1
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#define LOP_SKIP 2
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#define LOP_FIXO 3
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#define LOP_FIXR 4
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#define LOP_FIXRX 5
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#define LOP_FILE 6
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#define LOP_LINE 7
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#define LOP_SPEC 8
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#define LOP_PRE 9
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#define LOP_POST 10
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#define LOP_STAB 11
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#define LOP_END 12
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#define LOP_QUOTE_NEXT ((LOP << 24) | (LOP_QUOTE << 16) | 1)
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#define SPEC_DATA_SECTION 80
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#define LOP_SPEC_SECTION \
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((LOP << 24) | (LOP_SPEC << 16) | SPEC_DATA_SECTION)
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/* Must be a power of two. If you change this to be >= 64k, you need a
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new test-case; the ld test b-loc64k.d touches chunk-size problem areas. */
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#define MMO_SEC_CONTENTS_CHUNK_SIZE (1 << 15)
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/* An arbitrary number for the maximum length section name size. */
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#define MAX_SECTION_NAME_SIZE (1024 * 1024)
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/* A quite arbitrary number for the maximum length section size. */
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#define MAX_ARTIFICIAL_SECTION_SIZE (1024 * 1024 * 1024)
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#define MMO3_WCHAR 0x80
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#define MMO3_LEFT 0x40
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#define MMO3_MIDDLE 0x20
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#define MMO3_RIGHT 0x10
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#define MMO3_TYPEBITS 0xf
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#define MMO3_REGQUAL_BITS 0xf
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#define MMO3_UNDEF 2
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#define MMO3_DATA 8
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#define MMO3_SYMBITS 0x2f
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/* Put these everywhere in new code. */
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#define FATAL_DEBUG \
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_bfd_abort (__FILE__, __LINE__, \
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"Internal: Non-debugged code (test-case missing)")
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#define BAD_CASE(x) \
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_bfd_abort (__FILE__, __LINE__, \
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"bad case for " #x)
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enum mmo_sym_type { mmo_reg_sym, mmo_undef_sym, mmo_data_sym, mmo_abs_sym};
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/* When scanning the mmo file, a linked list of mmo_symbol
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structures is built to represent the symbol table (if there is
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one). */
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struct mmo_symbol
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{
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struct mmo_symbol *next;
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char *name;
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bfd_vma value;
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enum mmo_sym_type sym_type;
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unsigned int serno;
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};
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struct mmo_data_list_struct
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{
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struct mmo_data_list_struct *next;
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bfd_vma where;
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bfd_size_type size;
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bfd_size_type allocated_size;
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bfd_byte data[1];
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};
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typedef struct mmo_data_list_struct mmo_data_list_type;
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struct mmo_symbol_trie
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{
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struct mmo_symbol_trie *left;
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struct mmo_symbol_trie *right;
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struct mmo_symbol_trie *middle;
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bfd_byte symchar;
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/* A zero name means there's nothing here. */
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struct mmo_symbol sym;
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};
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/* The mmo tdata information. */
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struct mmo_data_struct
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{
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struct mmo_symbol *symbols;
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struct mmo_symbol *symtail;
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asymbol *csymbols;
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/* File representation of time (NULL) when this file was created. */
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bfd_byte created[4];
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/* When we're reading bytes recursively, check this occasionally.
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Also holds write errors. */
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bfd_boolean have_error;
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/* Max symbol length that may appear in the lop_stab table. Note that
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this table might just hold a subset of symbols for not-really large
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programs, as it can only be 65536 * 4 bytes large. */
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int max_symbol_length;
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/* Here's the symbol we build in lop_stab. */
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char *lop_stab_symbol;
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/* Index into lop_stab_symbol for the next character when parsing the
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symbol information. */
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int symbol_position;
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/* When creating arbitrary sections, we need to count section numbers. */
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int sec_no;
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/* When writing or reading byte-wise, we need to count the bytes
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within a 32-bit word. */
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int byte_no;
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/* We also need a buffer to hold the bytes we count reading or writing. */
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bfd_byte buf[4];
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};
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typedef struct mmo_data_struct tdata_type;
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struct mmo_section_data_struct
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{
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mmo_data_list_type *head;
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mmo_data_list_type *tail;
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};
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#define mmo_section_data(sec) \
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((struct mmo_section_data_struct *) (sec)->used_by_bfd)
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/* These structures are used in bfd_map_over_sections constructs. */
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/* Used when writing out sections; all but the register contents section
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which is stored in reg_section. */
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struct mmo_write_sec_info
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{
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asection *reg_section;
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bfd_boolean retval;
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};
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/* Used when trying to find a section corresponding to addr. */
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struct mmo_find_sec_info
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{
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asection *sec;
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bfd_vma addr;
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};
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static bfd_boolean mmo_bfd_copy_private_bfd_data (bfd *, bfd *);
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static void mmo_write_section_unless_reg_contents (bfd *, asection *, void *);
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static void mmo_find_sec_w_addr (bfd *, asection *, void *);
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static void mmo_find_sec_w_addr_grow (bfd *, asection *, void *);
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static asection *mmo_make_section (bfd *, const char *);
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static void mmo_get_symbol_info (bfd *, asymbol *, symbol_info *);
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static void mmo_print_symbol (bfd *, void *, asymbol *,
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bfd_print_symbol_type);
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static void mmo_init (void);
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static bfd_boolean mmo_mkobject (bfd *);
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static bfd_boolean mmo_scan (bfd *);
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static asection *mmo_decide_section (bfd *, bfd_vma);
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static asection *mmo_get_generic_spec_data_section (bfd *, int);
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static asection *mmo_get_spec_section (bfd *, int);
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static INLINE bfd_byte *mmo_get_loc (asection *, bfd_vma, int);
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static void mmo_xore_64 (asection *, bfd_vma vma, bfd_vma value);
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static void mmo_xore_32 (asection *, bfd_vma vma, unsigned int);
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static void mmo_xore_16 (asection *, bfd_vma vma, unsigned int);
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static const bfd_target *mmo_object_p (bfd *);
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static void mmo_map_set_sizes (bfd *, asection *, void *);
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static bfd_boolean mmo_get_symbols (bfd *);
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static bfd_boolean mmo_create_symbol (bfd *, const char *, bfd_vma,
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enum mmo_sym_type, unsigned int);
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static bfd_boolean mmo_get_section_contents (bfd *, asection *, void *,
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file_ptr, bfd_size_type);
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static long mmo_get_symtab_upper_bound (bfd *);
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static long mmo_canonicalize_symtab (bfd *, asymbol **);
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static void mmo_get_symbol_info (bfd *, asymbol *, symbol_info *);
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static void mmo_print_symbol (bfd *, void *, asymbol *,
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bfd_print_symbol_type);
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static bfd_boolean mmo_set_section_contents (bfd *, sec_ptr, const void *,
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file_ptr, bfd_size_type);
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static int mmo_sizeof_headers (bfd *, struct bfd_link_info *);
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static bfd_boolean mmo_internal_write_header (bfd *);
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static bfd_boolean mmo_internal_write_post (bfd *, int, asection *);
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static bfd_boolean mmo_internal_add_3_sym (bfd *, struct mmo_symbol_trie *,
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const struct mmo_symbol *);
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static unsigned int mmo_internal_3_length (bfd *, struct mmo_symbol_trie *);
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static void mmo_internal_3_dump (bfd *, struct mmo_symbol_trie *);
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static void mmo_beb128_out (bfd *, int, int);
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static bfd_boolean mmo_internal_write_section (bfd *, asection *);
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static void mmo_write_tetra (bfd *, unsigned int);
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static void mmo_write_tetra_raw (bfd *, unsigned int);
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static void mmo_write_octa (bfd *, bfd_vma);
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static void mmo_write_octa_raw (bfd *, bfd_vma);
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static bfd_boolean mmo_write_chunk (bfd *, const bfd_byte *, unsigned int);
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static bfd_boolean mmo_flush_chunk (bfd *);
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static bfd_boolean mmo_write_loc_chunk (bfd *, bfd_vma, const bfd_byte *,
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unsigned int, bfd_vma *);
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static bfd_boolean mmo_write_chunk_list (bfd *, mmo_data_list_type *);
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static bfd_boolean mmo_write_loc_chunk_list (bfd *, mmo_data_list_type *);
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static bfd_boolean mmo_write_symbols_and_terminator (bfd *);
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static flagword mmo_sec_flags_from_bfd_flags (flagword);
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static flagword bfd_sec_flags_from_mmo_flags (flagword);
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static bfd_byte mmo_get_byte (bfd *);
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static void mmo_write_byte (bfd *, bfd_byte);
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static bfd_boolean mmo_new_section_hook (bfd *, asection *);
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static int mmo_sort_mmo_symbols (const void *, const void *);
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static bfd_boolean mmo_write_object_contents (bfd *);
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static bfd_boolean mmo_write_section_description (bfd *, asection *);
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static bfd_boolean mmo_has_leading_or_trailing_zero_tetra_p (bfd *,
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asection *);
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/* Global "const" variables initialized once. Must not depend on
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particular input or caller; put such things into the bfd or elsewhere.
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Look ma, no static per-invocation data! */
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static
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char valid_mmo_symbol_character_set[/* A-Z a-z (we assume consecutive
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codes; sorry EBCDIC:ers!). */
|
|
+ 'Z' - 'A' + 1 + 'z' - 'a' + 1
|
|
/* Digits. */
|
|
+ 10
|
|
/* ':' and '_'. */
|
|
+ 1 + 1
|
|
/* Codes higher than 126. */
|
|
+ 256 - 126
|
|
/* Ending zero. */
|
|
+ 1];
|
|
|
|
|
|
/* Get section SECNAME or create one if it doesn't exist. When creating
|
|
one, new memory for the name is allocated. */
|
|
|
|
static asection *
|
|
mmo_make_section (bfd *abfd, const char *secname)
|
|
{
|
|
asection *sec = bfd_get_section_by_name (abfd, secname);
|
|
|
|
if (sec == NULL)
|
|
{
|
|
char *newsecname = strdup (secname);
|
|
|
|
if (newsecname == NULL)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: No core to allocate section name %s\n"),
|
|
bfd_get_filename (abfd), secname);
|
|
bfd_set_error (bfd_error_system_call);
|
|
return NULL;
|
|
}
|
|
sec = bfd_make_section (abfd, newsecname);
|
|
}
|
|
|
|
return sec;
|
|
}
|
|
|
|
/* Nothing to do, but keep as a placeholder if we need it.
|
|
Note that state that might differ between bfd:s must not be initialized
|
|
here, nor must it be static. Add it to tdata information instead. */
|
|
|
|
static void
|
|
mmo_init (void)
|
|
{
|
|
static bfd_boolean inited = FALSE;
|
|
int i = 0;
|
|
int j = 0;
|
|
static const char letters[]
|
|
= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789:_";
|
|
|
|
if (inited)
|
|
return;
|
|
inited = TRUE;
|
|
|
|
/* Fill in the set of valid symbol characters. */
|
|
strcpy (valid_mmo_symbol_character_set, letters);
|
|
i = strlen (letters);
|
|
|
|
for (j = 126; j < 256; j++)
|
|
valid_mmo_symbol_character_set[i++] = j;
|
|
}
|
|
|
|
/* Check whether an existing file is an mmo file. */
|
|
|
|
static const bfd_target *
|
|
mmo_object_p (bfd *abfd)
|
|
{
|
|
struct stat statbuf;
|
|
bfd_byte b[4];
|
|
|
|
mmo_init ();
|
|
|
|
if (bfd_stat (abfd, &statbuf) < 0
|
|
|| bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
|
|
|| bfd_bread (b, 4, abfd) != 4)
|
|
goto bad_final;
|
|
|
|
/* All mmo files are a multiple of four bytes long.
|
|
Only recognize version one. */
|
|
if ((statbuf.st_size % 4) != 0
|
|
|| b[0] != LOP || b[1] != LOP_PRE || b[2] != 1)
|
|
goto bad_format;
|
|
|
|
/* Get the last 32-bit word. */
|
|
if (bfd_seek (abfd, (file_ptr) statbuf.st_size - 4, SEEK_SET) != 0
|
|
|| bfd_bread (b, 4, abfd) != 4)
|
|
goto bad_final;
|
|
|
|
/* Check if the file ends in a lop_end lopcode. */
|
|
if (b[0] != LOP || b[1] != LOP_END || ! mmo_mkobject (abfd))
|
|
goto bad_format;
|
|
|
|
/* Compute an upper bound on the max symbol length. Not really
|
|
important as all of the symbol information can only be 256k. */
|
|
abfd->tdata.mmo_data->max_symbol_length = (b[2] * 256 + b[3]) * 4;
|
|
abfd->tdata.mmo_data->lop_stab_symbol
|
|
= bfd_malloc (abfd->tdata.mmo_data->max_symbol_length + 1);
|
|
|
|
if (abfd->tdata.mmo_data->lop_stab_symbol == NULL)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: No core to allocate a symbol %d bytes long\n"),
|
|
bfd_get_filename (abfd), abfd->tdata.mmo_data->max_symbol_length);
|
|
goto bad_final;
|
|
}
|
|
|
|
/* Read in everything. */
|
|
if (! mmo_scan (abfd))
|
|
goto bad_format_free;
|
|
|
|
if (abfd->symcount > 0)
|
|
abfd->flags |= HAS_SYMS;
|
|
|
|
/* You'll have to tweak this if you want to use this format for other
|
|
arches (not recommended due to its small-size limitations). Look at
|
|
the ELF format for how to make it target-generic. */
|
|
if (! bfd_default_set_arch_mach (abfd, bfd_arch_mmix, 0))
|
|
goto bad_format_free;
|
|
|
|
return abfd->xvec;
|
|
|
|
bad_format_free:
|
|
free (abfd->tdata.mmo_data->lop_stab_symbol);
|
|
bad_format:
|
|
bfd_set_error (bfd_error_wrong_format);
|
|
bad_final:
|
|
return NULL;
|
|
}
|
|
|
|
/* Set up the mmo tdata information. */
|
|
|
|
static bfd_boolean
|
|
mmo_mkobject (bfd *abfd)
|
|
{
|
|
mmo_init ();
|
|
|
|
if (abfd->tdata.mmo_data == NULL)
|
|
{
|
|
time_t created;
|
|
|
|
/* All fields are zero-initialized, so we don't have to explicitly
|
|
initialize most. */
|
|
tdata_type *tdata = (tdata_type *) bfd_zmalloc (sizeof (tdata_type));
|
|
if (tdata == NULL)
|
|
return FALSE;
|
|
|
|
created = time (NULL);
|
|
bfd_put_32 (abfd, created, tdata->created);
|
|
|
|
abfd->tdata.mmo_data = tdata;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static bfd_boolean
|
|
mmo_bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
|
|
{
|
|
if (bfd_get_flavour (ibfd) != bfd_target_mmo_flavour
|
|
|| bfd_get_flavour (obfd) != bfd_target_mmo_flavour)
|
|
return TRUE;
|
|
|
|
/* Copy the time the copied-from file was created. If people want the
|
|
time the file was last *modified*, they have that in the normal file
|
|
information. */
|
|
memcpy (obfd->tdata.mmo_data->created, ibfd->tdata.mmo_data->created,
|
|
sizeof (obfd->tdata.mmo_data->created));
|
|
return TRUE;
|
|
}
|
|
|
|
/* Helper functions for mmo_decide_section, used through
|
|
bfd_map_over_sections. */
|
|
|
|
static void
|
|
mmo_find_sec_w_addr (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *p)
|
|
{
|
|
struct mmo_find_sec_info *infop = (struct mmo_find_sec_info *) p;
|
|
bfd_vma vma = bfd_get_section_vma (abfd, sec);
|
|
|
|
/* Ignore sections that aren't loaded. */
|
|
if ((bfd_get_section_flags (abfd, sec) & (SEC_LOAD | SEC_ALLOC))
|
|
!= (SEC_LOAD | SEC_ALLOC))
|
|
return;
|
|
|
|
if (infop->addr >= vma && infop->addr < vma + sec->size)
|
|
infop->sec = sec;
|
|
}
|
|
|
|
static void
|
|
mmo_find_sec_w_addr_grow (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *p)
|
|
{
|
|
struct mmo_find_sec_info *infop = (struct mmo_find_sec_info *) p;
|
|
bfd_vma vma = bfd_get_section_vma (abfd, sec);
|
|
|
|
/* Ignore sections that aren't loaded. */
|
|
if ((bfd_get_section_flags (abfd, sec) & (SEC_LOAD | SEC_ALLOC))
|
|
!= (SEC_LOAD | SEC_ALLOC))
|
|
return;
|
|
|
|
if (infop->addr >= vma && infop->addr < vma + MAX_ARTIFICIAL_SECTION_SIZE)
|
|
infop->sec = sec;
|
|
}
|
|
|
|
/* Find a section that corresponds to a VMA. Automatically create .text
|
|
or .data and set current section to it, depending on what vma. If we
|
|
can't deduce a section, make one up as ".MMIX.sec.N", where N is an
|
|
increasing number. */
|
|
|
|
static asection *
|
|
mmo_decide_section (bfd *abfd, bfd_vma vma)
|
|
{
|
|
asection *sec = NULL;
|
|
char sec_name[sizeof (".MMIX.sec.") + 20];
|
|
struct mmo_find_sec_info info;
|
|
|
|
info.addr = vma;
|
|
info.sec = NULL;
|
|
|
|
/* First see if there's a section that would match exactly. */
|
|
bfd_map_over_sections (abfd, mmo_find_sec_w_addr, &info);
|
|
|
|
if (info.sec != NULL)
|
|
return info.sec;
|
|
|
|
/* If there's no such section, try and expand one of the existing ones,
|
|
up to a limit. Make sure we have .text and .data before we try that;
|
|
create them corresponding to expected addresses and set flags to make
|
|
them match the "loaded and with contents" expectation. */
|
|
if ((vma >> 56) == 0)
|
|
{
|
|
sec = bfd_make_section_old_way (abfd, MMO_TEXT_SECTION_NAME);
|
|
|
|
if (sec == NULL)
|
|
return NULL;
|
|
|
|
if (! sec->user_set_vma && ! bfd_set_section_vma (abfd, sec, vma))
|
|
return NULL;
|
|
|
|
if (! bfd_set_section_flags (abfd, sec,
|
|
bfd_get_section_flags (abfd, sec)
|
|
| SEC_CODE | SEC_LOAD | SEC_ALLOC))
|
|
return NULL;
|
|
}
|
|
else if ((vma >> 56) == 0x20)
|
|
{
|
|
sec = bfd_make_section_old_way (abfd, MMO_DATA_SECTION_NAME);
|
|
|
|
if (sec == NULL)
|
|
return NULL;
|
|
|
|
if (! sec->user_set_vma && ! bfd_set_section_vma (abfd, sec, vma))
|
|
return NULL;
|
|
|
|
if (! bfd_set_section_flags (abfd, sec,
|
|
bfd_get_section_flags (abfd, sec)
|
|
| SEC_LOAD | SEC_ALLOC))
|
|
return NULL;
|
|
}
|
|
|
|
bfd_map_over_sections (abfd, mmo_find_sec_w_addr_grow, &info);
|
|
|
|
if (info.sec != NULL)
|
|
return info.sec;
|
|
|
|
/* If there's still no suitable section, make a new one. */
|
|
sprintf (sec_name, ".MMIX.sec.%d", abfd->tdata.mmo_data->sec_no++);
|
|
sec = mmo_make_section (abfd, sec_name);
|
|
|
|
if (! sec->user_set_vma && ! bfd_set_section_vma (abfd, sec, vma))
|
|
return NULL;
|
|
|
|
if (! bfd_set_section_flags (abfd, sec,
|
|
bfd_get_section_flags (abfd, sec)
|
|
| SEC_LOAD | SEC_ALLOC))
|
|
return NULL;
|
|
return sec;
|
|
}
|
|
|
|
/* Xor in a 64-bit value VALUE at VMA. */
|
|
|
|
static INLINE void
|
|
mmo_xore_64 (asection *sec, bfd_vma vma, bfd_vma value)
|
|
{
|
|
bfd_byte *loc = mmo_get_loc (sec, vma, 8);
|
|
bfd_vma prev = bfd_get_64 (sec->owner, loc);
|
|
|
|
value ^= prev;
|
|
bfd_put_64 (sec->owner, value, loc);
|
|
}
|
|
|
|
/* Xor in a 32-bit value VALUE at VMA. */
|
|
|
|
static INLINE void
|
|
mmo_xore_32 (asection *sec, bfd_vma vma, unsigned int value)
|
|
{
|
|
bfd_byte *loc = mmo_get_loc (sec, vma, 4);
|
|
unsigned int prev = bfd_get_32 (sec->owner, loc);
|
|
|
|
value ^= prev;
|
|
bfd_put_32 (sec->owner, value, loc);
|
|
}
|
|
|
|
/* Xor in a 16-bit value VALUE at VMA. */
|
|
|
|
static INLINE void
|
|
mmo_xore_16 (asection *sec, bfd_vma vma, unsigned int value)
|
|
{
|
|
bfd_byte *loc = mmo_get_loc (sec, vma, 2);
|
|
unsigned int prev = bfd_get_16 (sec->owner, loc);
|
|
|
|
value ^= prev;
|
|
bfd_put_16 (sec->owner, value, loc);
|
|
}
|
|
|
|
/* Write a 32-bit word to output file, no lop_quote generated. */
|
|
|
|
static INLINE void
|
|
mmo_write_tetra_raw (bfd *abfd, unsigned int value)
|
|
{
|
|
bfd_byte buf[4];
|
|
|
|
bfd_put_32 (abfd, value, buf);
|
|
|
|
if (bfd_bwrite (buf, 4, abfd) != 4)
|
|
abfd->tdata.mmo_data->have_error = TRUE;
|
|
}
|
|
|
|
/* Write a 32-bit word to output file; lop_quote if necessary. */
|
|
|
|
static INLINE void
|
|
mmo_write_tetra (bfd *abfd, unsigned int value)
|
|
{
|
|
if (((value >> 24) & 0xff) == LOP)
|
|
mmo_write_tetra_raw (abfd, LOP_QUOTE_NEXT);
|
|
|
|
mmo_write_tetra_raw (abfd, value);
|
|
}
|
|
|
|
/* Write a 64-bit word to output file, perhaps with lop_quoting. */
|
|
|
|
static INLINE void
|
|
mmo_write_octa (bfd *abfd, bfd_vma value)
|
|
{
|
|
mmo_write_tetra (abfd, (unsigned int) (value >> 32));
|
|
mmo_write_tetra (abfd, (unsigned int) value);
|
|
}
|
|
|
|
/* Write a 64-bit word to output file, without lop_quoting. */
|
|
|
|
static INLINE void
|
|
mmo_write_octa_raw (bfd *abfd, bfd_vma value)
|
|
{
|
|
mmo_write_tetra_raw (abfd, (unsigned int) (value >> 32));
|
|
mmo_write_tetra_raw (abfd, (unsigned int) value);
|
|
}
|
|
|
|
/* Write quoted contents. Intended to be called multiple times in
|
|
sequence, followed by a call to mmo_flush_chunk. */
|
|
|
|
static INLINE bfd_boolean
|
|
mmo_write_chunk (bfd *abfd, const bfd_byte *loc, unsigned int len)
|
|
{
|
|
bfd_boolean retval = TRUE;
|
|
struct mmo_data_struct *mmop = abfd->tdata.mmo_data;
|
|
|
|
/* Fill up a tetra from bytes remaining from a previous chunk. */
|
|
if (mmop->byte_no != 0)
|
|
{
|
|
while (mmop->byte_no < 4 && len != 0)
|
|
{
|
|
mmop->buf[mmop->byte_no++] = *loc++;
|
|
len--;
|
|
}
|
|
|
|
if (mmop->byte_no == 4)
|
|
{
|
|
mmo_write_tetra (abfd, bfd_get_32 (abfd, mmop->buf));
|
|
mmop->byte_no = 0;
|
|
}
|
|
}
|
|
|
|
while (len >= 4)
|
|
{
|
|
if (loc[0] == LOP)
|
|
mmo_write_tetra_raw (abfd, LOP_QUOTE_NEXT);
|
|
|
|
retval = (retval
|
|
&& ! mmop->have_error
|
|
&& 4 == bfd_bwrite (loc, 4, abfd));
|
|
|
|
loc += 4;
|
|
len -= 4;
|
|
}
|
|
|
|
if (len)
|
|
{
|
|
/* We must have flushed a previous remainder if we get one from
|
|
this chunk too. */
|
|
BFD_ASSERT (mmop->byte_no == 0);
|
|
memcpy (mmop->buf, loc, len);
|
|
mmop->byte_no = len;
|
|
}
|
|
|
|
if (! retval)
|
|
mmop->have_error = TRUE;
|
|
return retval;
|
|
}
|
|
|
|
/* Flush remaining bytes, from a previous mmo_write_chunk, zero-padded to
|
|
4 bytes. */
|
|
|
|
static INLINE bfd_boolean
|
|
mmo_flush_chunk (bfd *abfd)
|
|
{
|
|
if (abfd->tdata.mmo_data->byte_no != 0)
|
|
{
|
|
memset (abfd->tdata.mmo_data->buf + abfd->tdata.mmo_data->byte_no,
|
|
0, 4 - abfd->tdata.mmo_data->byte_no);
|
|
mmo_write_tetra (abfd,
|
|
bfd_get_32 (abfd, abfd->tdata.mmo_data->buf));
|
|
abfd->tdata.mmo_data->byte_no = 0;
|
|
}
|
|
|
|
return ! abfd->tdata.mmo_data->have_error;
|
|
}
|
|
|
|
/* Same, but from a list. */
|
|
|
|
static INLINE bfd_boolean
|
|
mmo_write_chunk_list (bfd *abfd, mmo_data_list_type *datap)
|
|
{
|
|
for (; datap != NULL; datap = datap->next)
|
|
if (! mmo_write_chunk (abfd, datap->data, datap->size))
|
|
return FALSE;
|
|
|
|
return mmo_flush_chunk (abfd);
|
|
}
|
|
|
|
/* Write a lop_loc and some contents. A caller needs to call
|
|
mmo_flush_chunk after calling this function. The location is only
|
|
output if different than *LAST_VMAP, which is updated after this call. */
|
|
|
|
static bfd_boolean
|
|
mmo_write_loc_chunk (bfd *abfd, bfd_vma vma, const bfd_byte *loc,
|
|
unsigned int len, bfd_vma *last_vmap)
|
|
{
|
|
/* Find an initial and trailing section of zero (aligned) tetras; we don't
|
|
need to write out zeros. FIXME: When we do this, we should emit
|
|
section size and address specifiers, else objcopy can't always perform
|
|
an identity translation. Only do this if we *don't* have left-over
|
|
data from a previous write (and will not add any) or else the vma of
|
|
this chunk is *not* the next address, because then data isn't
|
|
tetrabyte-aligned and we're concatenating to that left-over data. */
|
|
|
|
if ((vma & 3) == 0
|
|
&& (abfd->tdata.mmo_data->byte_no == 0 || vma != *last_vmap))
|
|
{
|
|
while (len > 4 && bfd_get_32 (abfd, loc) == 0)
|
|
{
|
|
vma += 4;
|
|
len -= 4;
|
|
loc += 4;
|
|
}
|
|
|
|
if ((len & 3) == 0)
|
|
while (len > 4 && bfd_get_32 (abfd, loc + len - 4) == 0)
|
|
len -= 4;
|
|
}
|
|
|
|
/* Only write out the location if it's different than the one the caller
|
|
(supposedly) previously handled, accounting for omitted leading zeros. */
|
|
if (vma != *last_vmap)
|
|
{
|
|
/* We might be in the middle of a sequence. */
|
|
mmo_flush_chunk (abfd);
|
|
|
|
/* This should not happen during normal usage, but can presumably
|
|
happen with an erroneous linker-script, so handle gracefully.
|
|
Avoid Knuth-specific terms in the message, such as "tetrabyte".
|
|
Note that this function will get non-4-multiple lengths and
|
|
unaligned vmas but those come in tuples (mostly pairs) and are
|
|
continuous (i.e. the if-condition above false) and they are
|
|
group-wise aligned. */
|
|
if ((vma & 3) != 0)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: attempt to emit contents at non-multiple-of-4 address 0x%lx\n"),
|
|
bfd_get_filename (abfd), (unsigned long) vma);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return FALSE;
|
|
}
|
|
|
|
/* We always write the location as 64 bits; no use saving bytes
|
|
here. */
|
|
mmo_write_tetra_raw (abfd, (LOP << 24) | (LOP_LOC << 16) | 2);
|
|
mmo_write_octa_raw (abfd, vma);
|
|
}
|
|
|
|
/* Update to reflect end of this chunk, with trailing zeros omitted. */
|
|
*last_vmap = vma + len;
|
|
|
|
return (! abfd->tdata.mmo_data->have_error
|
|
&& mmo_write_chunk (abfd, loc, len));
|
|
}
|
|
|
|
/* Same, but from a list. */
|
|
|
|
static INLINE bfd_boolean
|
|
mmo_write_loc_chunk_list (bfd *abfd, mmo_data_list_type *datap)
|
|
{
|
|
/* Get an address different than the address of the first chunk. */
|
|
bfd_vma last_vma = datap ? datap->where - 1 : 0;
|
|
|
|
for (; datap != NULL; datap = datap->next)
|
|
if (! mmo_write_loc_chunk (abfd, datap->where, datap->data, datap->size,
|
|
&last_vma))
|
|
return FALSE;
|
|
|
|
return mmo_flush_chunk (abfd);
|
|
}
|
|
|
|
/* Make a .MMIX.spec_data.N section. */
|
|
|
|
static asection *
|
|
mmo_get_generic_spec_data_section (bfd *abfd, int spec_data_number)
|
|
{
|
|
asection *sec;
|
|
char secname[sizeof (MMIX_OTHER_SPEC_SECTION_PREFIX) + 20]
|
|
= MMIX_OTHER_SPEC_SECTION_PREFIX;
|
|
|
|
sprintf (secname + strlen (MMIX_OTHER_SPEC_SECTION_PREFIX),
|
|
"%d", spec_data_number);
|
|
|
|
sec = mmo_make_section (abfd, secname);
|
|
|
|
return sec;
|
|
}
|
|
|
|
/* Make a special section for SPEC_DATA_NUMBER. If it is the one we use
|
|
ourselves, parse some of its data to get at the section name. */
|
|
|
|
static asection *
|
|
mmo_get_spec_section (bfd *abfd, int spec_data_number)
|
|
{
|
|
char *secname;
|
|
asection *sec;
|
|
bfd_byte buf[4];
|
|
unsigned int secname_length;
|
|
unsigned int i;
|
|
bfd_vma section_length;
|
|
bfd_vma section_vma;
|
|
mmo_data_list_type *loc;
|
|
flagword flags;
|
|
long orig_pos;
|
|
|
|
/* If this isn't the "special" special data, then make a placeholder
|
|
section. */
|
|
if (spec_data_number != SPEC_DATA_SECTION)
|
|
return mmo_get_generic_spec_data_section (abfd, spec_data_number);
|
|
|
|
/* Seek back to this position if there was a format error. */
|
|
orig_pos = bfd_tell (abfd);
|
|
|
|
/* Read the length (in 32-bit words). */
|
|
if (bfd_bread (buf, 4, abfd) != 4)
|
|
goto format_error;
|
|
|
|
if (buf[0] == LOP)
|
|
{
|
|
if (buf[1] != LOP_QUOTE)
|
|
goto format_error;
|
|
|
|
if (bfd_bread (buf, 4, abfd) != 4)
|
|
goto format_error;
|
|
}
|
|
|
|
/* We don't care to keep the name length accurate. It's
|
|
zero-terminated. */
|
|
secname_length = bfd_get_32 (abfd, buf) * 4;
|
|
|
|
/* Check section name length for sanity. */
|
|
if (secname_length > MAX_SECTION_NAME_SIZE)
|
|
goto format_error;
|
|
|
|
/* This should be free'd regardless if a section is created. */
|
|
secname = bfd_malloc (secname_length + 1);
|
|
secname[secname_length] = 0;
|
|
|
|
for (i = 0; i < secname_length / 4; i++)
|
|
{
|
|
if (bfd_bread (secname + i * 4, 4, abfd) != 4)
|
|
goto format_error_free;
|
|
|
|
if (secname[i * 4] == (char) LOP)
|
|
{
|
|
/* A bit of overkill, but we handle char 0x98 in a section name,
|
|
and recognize misparsing. */
|
|
if (secname[i * 4 + 1] != LOP_QUOTE
|
|
|| bfd_bread (secname + i * 4, 4, abfd) != 4)
|
|
/* Whoops. We thought this was a name, and now we found a
|
|
non-lop_quote lopcode before we parsed the whole length of
|
|
the name. Signal end-of-file in the same manner. */
|
|
goto format_error_free;
|
|
}
|
|
}
|
|
|
|
/* Get the section flags. */
|
|
if (bfd_bread (buf, 4, abfd) != 4
|
|
|| (buf[0] == LOP
|
|
&& (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4)))
|
|
goto format_error_free;
|
|
|
|
flags = bfd_get_32 (abfd, buf);
|
|
|
|
/* Get the section length. */
|
|
if (bfd_bread (buf, 4, abfd) != 4
|
|
|| (buf[0] == LOP
|
|
&& (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4)))
|
|
goto format_error_free;
|
|
|
|
section_length = (bfd_vma) bfd_get_32 (abfd, buf) << 32;
|
|
|
|
/* That's the first, high-part. Now get the low part. */
|
|
|
|
if (bfd_bread (buf, 4, abfd) != 4
|
|
|| (buf[0] == LOP
|
|
&& (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4)))
|
|
goto format_error_free;
|
|
|
|
section_length |= (bfd_vma) bfd_get_32 (abfd, buf);
|
|
|
|
/* Check the section length for sanity. */
|
|
if (section_length > MAX_ARTIFICIAL_SECTION_SIZE)
|
|
goto format_error_free;
|
|
|
|
/* Get the section VMA. */
|
|
if (bfd_bread (buf, 4, abfd) != 4
|
|
|| (buf[0] == LOP
|
|
&& (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4)))
|
|
goto format_error_free;
|
|
|
|
section_vma = (bfd_vma) bfd_get_32 (abfd, buf) << 32;
|
|
|
|
/* That's the first, high-part. Now get the low part. */
|
|
if (bfd_bread (buf, 4, abfd) != 4
|
|
|| (buf[0] == LOP
|
|
&& (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4)))
|
|
goto format_error_free;
|
|
|
|
section_vma |= (bfd_vma) bfd_get_32 (abfd, buf);
|
|
|
|
sec = mmo_make_section (abfd, secname);
|
|
free (secname);
|
|
if (sec == NULL)
|
|
goto format_error;
|
|
|
|
/* We allocate a buffer here for the advertised size, with head room for
|
|
tetrabyte alignment. */
|
|
loc = bfd_zmalloc (section_length + 3
|
|
+ sizeof (struct mmo_data_list_struct));
|
|
if (loc == NULL)
|
|
goto format_error;
|
|
|
|
/* Use a TETRA-rounded size for the allocated buffer; we set the
|
|
"visible" section size below. */
|
|
loc->size = (section_length + 3) & ~3;
|
|
|
|
/* Add in the section flags we found to those bfd entered during this
|
|
process and set the contents. */
|
|
if (! bfd_set_section_flags (abfd, sec,
|
|
bfd_sec_flags_from_mmo_flags (flags)
|
|
| bfd_get_section_flags (abfd, sec)
|
|
| (section_length != 0 ? SEC_HAS_CONTENTS : 0))
|
|
|| ! bfd_set_section_size (abfd, sec, sec->size + section_length)
|
|
/* Set VMA only for the first occurrence. */
|
|
|| (! sec->user_set_vma
|
|
&& ! bfd_set_section_vma (abfd, sec, section_vma)))
|
|
{
|
|
/* If we get an error for any of the calls above, signal more than
|
|
just a format error for the spec section. */
|
|
return NULL;
|
|
}
|
|
|
|
loc->next = NULL;
|
|
if (mmo_section_data (sec)->tail != NULL)
|
|
mmo_section_data (sec)->tail->next = loc;
|
|
else
|
|
mmo_section_data (sec)->head = loc;
|
|
mmo_section_data (sec)->tail = loc;
|
|
loc->where = section_vma;
|
|
|
|
return sec;
|
|
|
|
format_error_free:
|
|
free (secname);
|
|
format_error:
|
|
if (bfd_seek (abfd, orig_pos, SEEK_SET) != 0)
|
|
return NULL;
|
|
|
|
return mmo_get_generic_spec_data_section (abfd, spec_data_number);
|
|
}
|
|
|
|
/* Read a byte, but read from file in multiples of 32-bit words. */
|
|
|
|
static bfd_byte
|
|
mmo_get_byte (bfd *abfd)
|
|
{
|
|
bfd_byte retval;
|
|
|
|
if (abfd->tdata.mmo_data->byte_no == 0)
|
|
{
|
|
if (! abfd->tdata.mmo_data->have_error
|
|
&& bfd_bread (abfd->tdata.mmo_data->buf, 4, abfd) != 4)
|
|
{
|
|
abfd->tdata.mmo_data->have_error = TRUE;
|
|
|
|
/* A value somewhat safe against tripping on some inconsistency
|
|
when mopping up after this error. */
|
|
return 128;
|
|
}
|
|
}
|
|
|
|
retval = abfd->tdata.mmo_data->buf[abfd->tdata.mmo_data->byte_no];
|
|
abfd->tdata.mmo_data->byte_no = (abfd->tdata.mmo_data->byte_no + 1) % 4;
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* Write a byte, in multiples of 32-bit words. */
|
|
|
|
static void
|
|
mmo_write_byte (bfd *abfd, bfd_byte value)
|
|
{
|
|
abfd->tdata.mmo_data->buf[(abfd->tdata.mmo_data->byte_no++ % 4)] = value;
|
|
if ((abfd->tdata.mmo_data->byte_no % 4) == 0)
|
|
{
|
|
if (! abfd->tdata.mmo_data->have_error
|
|
&& bfd_bwrite (abfd->tdata.mmo_data->buf, 4, abfd) != 4)
|
|
abfd->tdata.mmo_data->have_error = TRUE;
|
|
}
|
|
}
|
|
|
|
/* Create a symbol. */
|
|
|
|
static bfd_boolean
|
|
mmo_create_symbol (bfd *abfd, const char *symname, bfd_vma addr, enum
|
|
mmo_sym_type sym_type, unsigned int serno)
|
|
{
|
|
struct mmo_symbol *n;
|
|
|
|
n = (struct mmo_symbol *) bfd_alloc (abfd, sizeof (struct mmo_symbol));
|
|
if (n == NULL)
|
|
return FALSE;
|
|
|
|
n->name = bfd_alloc (abfd, strlen (symname) + 1);
|
|
if (n->name == NULL)
|
|
return FALSE;
|
|
|
|
strcpy (n->name, symname);
|
|
|
|
n->value = addr;
|
|
n->sym_type = sym_type;
|
|
n->serno = serno;
|
|
|
|
if (abfd->tdata.mmo_data->symbols == NULL)
|
|
abfd->tdata.mmo_data->symbols = n;
|
|
else
|
|
abfd->tdata.mmo_data->symtail->next = n;
|
|
abfd->tdata.mmo_data->symtail = n;
|
|
n->next = NULL;
|
|
|
|
++abfd->symcount;
|
|
|
|
/* Check that :Main equals the last octa of the .MMIX.reg_contents
|
|
section, as it's the one place we're sure to pass when reading a mmo
|
|
object. For written objects, we do it while setting the symbol
|
|
table. */
|
|
if (strcmp (symname, MMIX_START_SYMBOL_NAME) == 0
|
|
&& bfd_get_start_address (abfd) != addr)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: initialization value for $255 is not `Main'\n"),
|
|
bfd_get_filename (abfd));
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Read in symbols. */
|
|
|
|
static bfd_boolean
|
|
mmo_get_symbols (bfd *abfd)
|
|
{
|
|
/*
|
|
INODE
|
|
Symbol-table, mmo section mapping, File layout, mmo
|
|
SUBSECTION
|
|
Symbol table format
|
|
|
|
From mmixal.w (or really, the generated mmixal.tex) in the
|
|
MMIXware package which also contains the @command{mmix} simulator:
|
|
``Symbols are stored and retrieved by means of a @samp{ternary
|
|
search trie}, following ideas of Bentley and Sedgewick. (See
|
|
ACM--SIAM Symp.@: on Discrete Algorithms @samp{8} (1997), 360--369;
|
|
R.@:Sedgewick, @samp{Algorithms in C} (Reading, Mass.@:
|
|
Addison--Wesley, 1998), @samp{15.4}.) Each trie node stores a
|
|
character, and there are branches to subtries for the cases where
|
|
a given character is less than, equal to, or greater than the
|
|
character in the trie. There also is a pointer to a symbol table
|
|
entry if a symbol ends at the current node.''
|
|
|
|
So it's a tree encoded as a stream of bytes. The stream of bytes
|
|
acts on a single virtual global symbol, adding and removing
|
|
characters and signalling complete symbol points. Here, we read
|
|
the stream and create symbols at the completion points.
|
|
|
|
First, there's a control byte <<m>>. If any of the listed bits
|
|
in <<m>> is nonzero, we execute what stands at the right, in
|
|
the listed order:
|
|
|
|
| (MMO3_LEFT)
|
|
| 0x40 - Traverse left trie.
|
|
| (Read a new command byte and recurse.)
|
|
|
|
|
| (MMO3_SYMBITS)
|
|
| 0x2f - Read the next byte as a character and store it in the
|
|
| current character position; increment character position.
|
|
| Test the bits of <<m>>:
|
|
|
|
|
| (MMO3_WCHAR)
|
|
| 0x80 - The character is 16-bit (so read another byte,
|
|
| merge into current character.
|
|
|
|
|
| (MMO3_TYPEBITS)
|
|
| 0xf - We have a complete symbol; parse the type, value
|
|
| and serial number and do what should be done
|
|
| with a symbol. The type and length information
|
|
| is in j = (m & 0xf).
|
|
|
|
|
| (MMO3_REGQUAL_BITS)
|
|
| j == 0xf: A register variable. The following
|
|
| byte tells which register.
|
|
| j <= 8: An absolute symbol. Read j bytes as the
|
|
| big-endian number the symbol equals.
|
|
| A j = 2 with two zero bytes denotes an
|
|
| unknown symbol.
|
|
| j > 8: As with j <= 8, but add (0x20 << 56)
|
|
| to the value in the following j - 8
|
|
| bytes.
|
|
|
|
|
| Then comes the serial number, as a variant of
|
|
| uleb128, but better named ubeb128:
|
|
| Read bytes and shift the previous value left 7
|
|
| (multiply by 128). Add in the new byte, repeat
|
|
| until a byte has bit 7 set. The serial number
|
|
| is the computed value minus 128.
|
|
|
|
|
| (MMO3_MIDDLE)
|
|
| 0x20 - Traverse middle trie. (Read a new command byte
|
|
| and recurse.) Decrement character position.
|
|
|
|
|
| (MMO3_RIGHT)
|
|
| 0x10 - Traverse right trie. (Read a new command byte and
|
|
| recurse.)
|
|
|
|
Let's look again at the <<lop_stab>> for the trivial file
|
|
(@pxref{File layout}).
|
|
|
|
| 0x980b0000 - lop_stab for ":Main" = 0, serial 1.
|
|
| 0x203a4040
|
|
| 0x10404020
|
|
| 0x4d206120
|
|
| 0x69016e00
|
|
| 0x81000000
|
|
|
|
This forms the trivial trie (note that the path between ``:'' and
|
|
``M'' is redundant):
|
|
|
|
| 203a ":"
|
|
| 40 /
|
|
| 40 /
|
|
| 10 \
|
|
| 40 /
|
|
| 40 /
|
|
| 204d "M"
|
|
| 2061 "a"
|
|
| 2069 "i"
|
|
| 016e "n" is the last character in a full symbol, and
|
|
| with a value represented in one byte.
|
|
| 00 The value is 0.
|
|
| 81 The serial number is 1. */
|
|
|
|
bfd_byte m = mmo_get_byte (abfd);
|
|
|
|
/* Check first if we have a bad hair day. */
|
|
if (abfd->tdata.mmo_data->have_error)
|
|
return FALSE;
|
|
|
|
if (m & MMO3_LEFT)
|
|
/* Traverse left trie. */
|
|
mmo_get_symbols (abfd);
|
|
|
|
if (m & MMO3_SYMBITS)
|
|
{
|
|
bfd_byte c = mmo_get_byte (abfd);
|
|
bfd_byte j = m & MMO3_TYPEBITS;
|
|
bfd_vma addr = 0;
|
|
enum mmo_sym_type sym_type;
|
|
unsigned int serno = 0;
|
|
bfd_byte k;
|
|
|
|
if (m & MMO3_WCHAR)
|
|
{
|
|
bfd_byte c2 = mmo_get_byte (abfd);
|
|
|
|
/* A two-byte character. We can't grok this, but neither can
|
|
mmotype, for other cases than the second byte being zero. */
|
|
|
|
if (c != 0)
|
|
{
|
|
abfd->tdata.mmo_data->lop_stab_symbol
|
|
[abfd->tdata.mmo_data->symbol_position] = 0;
|
|
|
|
(*_bfd_error_handler)
|
|
(_("%s: unsupported wide character sequence"
|
|
" 0x%02X 0x%02X after symbol name starting with `%s'\n"),
|
|
bfd_get_filename (abfd), c, c2,
|
|
abfd->tdata.mmo_data->lop_stab_symbol);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
abfd->tdata.mmo_data->have_error = TRUE;
|
|
return FALSE;
|
|
}
|
|
else
|
|
c = c2;
|
|
}
|
|
|
|
abfd->tdata.mmo_data->lop_stab_symbol[abfd->tdata.mmo_data->symbol_position++] = c;
|
|
abfd->tdata.mmo_data->lop_stab_symbol[abfd->tdata.mmo_data->symbol_position] = 0;
|
|
|
|
if (j & MMO3_REGQUAL_BITS)
|
|
{
|
|
if (j == MMO3_REGQUAL_BITS)
|
|
{
|
|
sym_type = mmo_reg_sym;
|
|
addr = mmo_get_byte (abfd);
|
|
}
|
|
else if (j <= 8)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < j; i++)
|
|
addr = (addr << 8) + mmo_get_byte (abfd);
|
|
|
|
if (addr == 0 && j == MMO3_UNDEF)
|
|
sym_type = mmo_undef_sym;
|
|
else
|
|
sym_type = mmo_abs_sym;
|
|
}
|
|
else
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = MMO3_DATA; i < j; i++)
|
|
addr = (addr << 8) + mmo_get_byte (abfd);
|
|
|
|
addr += (bfd_vma) 0x20 << 56;
|
|
sym_type = mmo_data_sym;
|
|
}
|
|
|
|
/* Get the serial number. */
|
|
do
|
|
{
|
|
k = mmo_get_byte (abfd);
|
|
serno = (serno << 7) + k;
|
|
}
|
|
while (k < 128);
|
|
serno -= 128;
|
|
|
|
/* Got it. Now enter it. Skip a leading ":". */
|
|
if (! abfd->tdata.mmo_data->have_error
|
|
&& ! mmo_create_symbol (abfd,
|
|
abfd->tdata.mmo_data->lop_stab_symbol
|
|
+ 1,
|
|
addr, sym_type, serno))
|
|
abfd->tdata.mmo_data->have_error = TRUE;
|
|
}
|
|
|
|
if (m & MMO3_MIDDLE)
|
|
/* Traverse middle trie. */
|
|
mmo_get_symbols (abfd);
|
|
|
|
abfd->tdata.mmo_data->symbol_position--;
|
|
}
|
|
|
|
if (m & MMO3_RIGHT)
|
|
/* Traverse right trie. */
|
|
mmo_get_symbols (abfd);
|
|
|
|
return ! abfd->tdata.mmo_data->have_error;
|
|
}
|
|
|
|
/* Get the location of memory area [VMA..VMA + SIZE - 1], which we think
|
|
is in section SEC. Adjust and reallocate zero-initialized contents.
|
|
If there's new contents, allocate to the next multiple of
|
|
MMO_SEC_CONTENTS_CHUNK_SIZE. */
|
|
|
|
static INLINE bfd_byte *
|
|
mmo_get_loc (asection *sec, bfd_vma vma, int size)
|
|
{
|
|
bfd_size_type allocated_size;
|
|
struct mmo_section_data_struct *sdatap = mmo_section_data (sec);
|
|
struct mmo_data_list_struct *datap = sdatap->head;
|
|
struct mmo_data_list_struct *entry;
|
|
|
|
/* First search the list to see if we have the requested chunk in one
|
|
piece, or perhaps if we have a suitable chunk with room to fit. */
|
|
for (; datap != NULL; datap = datap->next)
|
|
{
|
|
if (datap->where <= vma
|
|
&& datap->where + datap->size >= vma + size)
|
|
return datap->data + vma - datap->where;
|
|
else if (datap->where <= vma
|
|
&& datap->where + datap->allocated_size >= vma + size
|
|
/* Only munch on the "allocated size" if it does not
|
|
overlap the next chunk. */
|
|
&& (datap->next == NULL || datap->next->where >= vma + size))
|
|
{
|
|
/* There was room allocated, but the size wasn't set to include
|
|
it. Do that now. */
|
|
datap->size += (vma + size) - (datap->where + datap->size);
|
|
|
|
/* Update the section size. This happens only if we update the
|
|
32-bit-aligned chunk size. Callers that have
|
|
non-32-bit-aligned sections should do all allocation and
|
|
size-setting by themselves or at least set the section size
|
|
after the last allocating call to this function. */
|
|
if (vma + size > sec->vma + sec->size)
|
|
sec->size += (vma + size) - (sec->vma + sec->size);
|
|
|
|
return datap->data + vma - datap->where;
|
|
}
|
|
}
|
|
|
|
/* Not found; allocate a new block. First check in case we get a
|
|
request for a size split up over several blocks; we'll have to return
|
|
NULL for those cases, requesting the caller to split up the request.
|
|
Requests with an address aligned on MMO_SEC_CONTENTS_CHUNK_SIZE bytes and
|
|
for no more than MMO_SEC_CONTENTS_CHUNK_SIZE will always get resolved. */
|
|
|
|
for (datap = sdatap->head; datap != NULL; datap = datap->next)
|
|
if ((datap->where <= vma && datap->where + datap->size > vma)
|
|
|| (datap->where < vma + size
|
|
&& datap->where + datap->size >= vma + size))
|
|
return NULL;
|
|
|
|
allocated_size
|
|
= (size + MMO_SEC_CONTENTS_CHUNK_SIZE - 1) & ~(MMO_SEC_CONTENTS_CHUNK_SIZE - 1);
|
|
entry = (mmo_data_list_type *)
|
|
bfd_zalloc (sec->owner, sizeof (mmo_data_list_type) + allocated_size);
|
|
if (entry == NULL)
|
|
return NULL;
|
|
entry->where = vma;
|
|
entry->size = size;
|
|
entry->allocated_size = allocated_size;
|
|
|
|
datap = sdatap->head;
|
|
|
|
/* Sort the records by address. Optimize for the common case of adding
|
|
a record to the end of the list. */
|
|
if (sdatap->tail != NULL && entry->where >= sdatap->tail->where)
|
|
{
|
|
sdatap->tail->next = entry;
|
|
entry->next = NULL;
|
|
sdatap->tail = entry;
|
|
}
|
|
else
|
|
{
|
|
mmo_data_list_type **look;
|
|
for (look = &sdatap->head;
|
|
*look != NULL && (*look)->where < entry->where;
|
|
look = &(*look)->next)
|
|
;
|
|
entry->next = *look;
|
|
*look = entry;
|
|
if (entry->next == NULL)
|
|
{
|
|
sdatap->tail = entry;
|
|
|
|
/* We get here for the first time (at other times too) for this
|
|
section. Say we have contents. */
|
|
if (! bfd_set_section_flags (sec->owner, sec,
|
|
bfd_get_section_flags (sec->owner, sec)
|
|
| SEC_HAS_CONTENTS))
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* Update the section size. This happens only when we add contents and
|
|
re-size as we go. The section size will then be aligned to 32 bits. */
|
|
if (vma + size > sec->vma + sec->size)
|
|
sec->size += (vma + size) - (sec->vma + sec->size);
|
|
return entry->data;
|
|
}
|
|
|
|
/* Set sizes once we've read in all sections. */
|
|
|
|
static void
|
|
mmo_map_set_sizes (bfd *abfd ATTRIBUTE_UNUSED, asection *sec,
|
|
void *ignored ATTRIBUTE_UNUSED)
|
|
{
|
|
sec->lma = sec->vma;
|
|
}
|
|
|
|
/* Read the mmo file and turn it into sections. */
|
|
|
|
static bfd_boolean
|
|
mmo_scan (bfd *abfd)
|
|
{
|
|
unsigned int i;
|
|
unsigned int lineno = 1;
|
|
bfd_boolean error = FALSE;
|
|
bfd_vma vma = 0;
|
|
asection *sec = bfd_make_section_old_way (abfd, MMO_TEXT_SECTION_NAME);
|
|
asection *non_spec_sec = NULL;
|
|
bfd_vma non_spec_vma = 0;
|
|
bfd_size_type nbytes_read = 0;
|
|
/* Buffer with room to read a 64-bit value. */
|
|
bfd_byte buf[8];
|
|
long stab_loc = -1;
|
|
char *file_names[256];
|
|
|
|
abfd->symcount = 0;
|
|
memset (file_names, 0, sizeof (file_names));
|
|
|
|
if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
|
|
goto error_return;
|
|
|
|
while ((nbytes_read = bfd_bread (buf, 4, abfd)) == 4)
|
|
{
|
|
if (buf[0] == LOP)
|
|
{
|
|
unsigned int y = bfd_get_8 (abfd, buf + 2);
|
|
unsigned int z = bfd_get_8 (abfd, buf + 3);
|
|
|
|
/* Change back to the original section for lopcodes other
|
|
than LOP_QUOTE that comes after a LOP_SPEC. */
|
|
if ((buf[1] != LOP_QUOTE || y != 0 || z != 1)
|
|
&& non_spec_sec != NULL)
|
|
{
|
|
sec = non_spec_sec;
|
|
vma = non_spec_vma;
|
|
non_spec_sec = NULL;
|
|
}
|
|
|
|
switch (buf[1])
|
|
{
|
|
default:
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: unsupported lopcode `%d'\n"),
|
|
bfd_get_filename (abfd), buf[1]);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
|
|
case LOP_QUOTE:
|
|
/* Quote the next 32-bit word. */
|
|
if (y != 0 || z != 1)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: expected YZ = 1 got YZ = %d for lop_quote\n"),
|
|
bfd_get_filename (abfd), y*256+z);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
if (bfd_bread (buf, 4, abfd) != 4)
|
|
goto error_return;
|
|
|
|
vma &= ~3;
|
|
mmo_xore_32 (sec, vma, bfd_get_32 (abfd, buf));
|
|
vma += 4;
|
|
lineno++;
|
|
break;
|
|
|
|
case LOP_LOC:
|
|
/* Set vma (and section). */
|
|
vma = (bfd_vma) y << 56;
|
|
if (z == 1)
|
|
{
|
|
/* Get a 32-bit value. */
|
|
if (bfd_bread (buf, 4, abfd) != 4)
|
|
goto error_return;
|
|
|
|
vma += bfd_get_32 (abfd, buf);
|
|
}
|
|
else if (z == 2)
|
|
{
|
|
/* Get a 64-bit value. */
|
|
if (bfd_bread (buf, 8, abfd) != 8)
|
|
goto error_return;
|
|
|
|
vma += bfd_get_64 (abfd, buf);
|
|
}
|
|
else
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: expected z = 1 or z = 2, got z = %d for lop_loc\n"),
|
|
bfd_get_filename (abfd), z);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
|
|
/* When we decide which section the data goes into, we might
|
|
create the section. If that happens, make sure the VMA at
|
|
creation time is tetra-aligned. */
|
|
sec = mmo_decide_section (abfd, vma & ~3);
|
|
if (sec == NULL)
|
|
goto error_return;
|
|
break;
|
|
|
|
case LOP_SKIP:
|
|
/* Move forward within the same section. */
|
|
vma += y * 256 + z;
|
|
|
|
sec = mmo_decide_section (abfd, vma);
|
|
if (sec == NULL)
|
|
goto error_return;
|
|
break;
|
|
|
|
case LOP_FIXO:
|
|
/* A fixup: Store the current vma somewhere. Position using
|
|
same format as LOP_LOC. */
|
|
{
|
|
bfd_vma p = (bfd_vma) y << 56;
|
|
asection *fixosec;
|
|
|
|
if (z == 1)
|
|
{
|
|
/* Get a 32-bit value. */
|
|
if (bfd_bread (buf, 4, abfd) != 4)
|
|
goto error_return;
|
|
|
|
p += bfd_get_32 (abfd, buf);
|
|
}
|
|
else if (z == 2)
|
|
{
|
|
/* Get a 64-bit value. */
|
|
if (bfd_bread (buf, 8, abfd) != 8)
|
|
goto error_return;
|
|
|
|
p += bfd_get_64 (abfd, buf);
|
|
}
|
|
else
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: expected z = 1 or z = 2, got z = %d for lop_fixo\n"),
|
|
bfd_get_filename (abfd), z);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
|
|
/* The section where we store this address might be a
|
|
different one than the current section. */
|
|
fixosec = mmo_decide_section (abfd, p);
|
|
if (fixosec == NULL)
|
|
goto error_return;
|
|
mmo_xore_64 (fixosec, p, vma);
|
|
}
|
|
break;
|
|
|
|
case LOP_FIXR:
|
|
/* A fixup: Store YZ of this lopcode into YZ at vma - 4 * yz. */
|
|
{
|
|
unsigned int yz = (y * 256 + z);
|
|
bfd_vma p = vma + 2 - 4 * yz;
|
|
asection *fixrsec = mmo_decide_section (abfd, p);
|
|
if (fixrsec == NULL)
|
|
goto error_return;
|
|
mmo_xore_16 (fixrsec, p, yz);
|
|
}
|
|
break;
|
|
|
|
case LOP_FIXRX:
|
|
/* A fixup, similar to lop_fixr, but taking larger numbers
|
|
and can change branches into the opposite direction
|
|
(gasp!). */
|
|
{
|
|
bfd_vma delta;
|
|
bfd_vma p;
|
|
asection *fixrsec;
|
|
|
|
if (y != 0)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: expected y = 0, got y = %d for lop_fixrx\n"),
|
|
bfd_get_filename (abfd), y);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
|
|
if (z != 16 && z != 24)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: expected z = 16 or z = 24, got z = %d for lop_fixrx\n"),
|
|
bfd_get_filename (abfd), z);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
|
|
/* Get the next 32-bit value. */
|
|
if (bfd_bread (buf, 4, abfd) != 4)
|
|
goto error_return;
|
|
|
|
delta = bfd_get_32 (abfd, buf);
|
|
|
|
/* Do an, ehm, involved calculation for the location of
|
|
the fixup. See mmixal documentation for a verbose
|
|
explanation. We follow it verbosely here for the
|
|
readers delight. */
|
|
if (buf[0] == 0)
|
|
p = vma - 4 * delta;
|
|
else if (buf[0] == 1)
|
|
p = vma - 4 * ((delta & 0xffffff) - (1 << z));
|
|
else
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: leading byte of operand word must be 0 or 1, got %d for lop_fixrx\n"),
|
|
bfd_get_filename (abfd), buf[0]);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
|
|
fixrsec = mmo_decide_section (abfd, vma);
|
|
if (fixrsec == NULL)
|
|
goto error_return;
|
|
mmo_xore_32 (fixrsec, p, delta);
|
|
}
|
|
break;
|
|
|
|
case LOP_FILE:
|
|
/* Set current file and perhaps the file name. Reset line
|
|
number. */
|
|
if (z != 0)
|
|
{
|
|
char *fname = bfd_malloc (z * 4 + 1);
|
|
|
|
if (fname == NULL)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: cannot allocate file name for file number %d, %d bytes\n"),
|
|
bfd_get_filename (abfd), y, z * 4 + 1);
|
|
bfd_set_error (bfd_error_system_call);
|
|
goto error_return;
|
|
}
|
|
|
|
fname[z * 4] = 0;
|
|
|
|
for (i = 0; i < z; i++)
|
|
{
|
|
if (bfd_bread (fname + i * 4, 4, abfd) != 4)
|
|
{
|
|
free (fname);
|
|
goto error_return;
|
|
}
|
|
}
|
|
|
|
if (file_names[y] != NULL)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: file number %d `%s',"
|
|
" was already entered as `%s'\n"),
|
|
bfd_get_filename (abfd), y, fname, file_names[y]);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
|
|
file_names[y] = fname;
|
|
}
|
|
|
|
if (file_names[y] == NULL)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: file name for number %d"
|
|
" was not specified before use\n"),
|
|
bfd_get_filename (abfd), y);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
|
|
lineno = 0;
|
|
break;
|
|
|
|
case LOP_LINE:
|
|
/* Set line number. */
|
|
lineno = y * 256 + z;
|
|
/* FIXME: Create a sequence of mmo-specific line number
|
|
entries for each section, then translate into canonical
|
|
format. */
|
|
break;
|
|
|
|
case LOP_SPEC:
|
|
/* Special data follows until the next non-lop_quote
|
|
lopcode. */
|
|
non_spec_sec = sec;
|
|
non_spec_vma = vma;
|
|
sec = mmo_get_spec_section (abfd, y * 256 + z);
|
|
if (sec == NULL)
|
|
goto error_return;
|
|
|
|
vma = sec->vma;
|
|
break;
|
|
|
|
case LOP_PRE:
|
|
{
|
|
/* We ignore header information, except we read in the
|
|
creation time from the first 32-bit word with the time
|
|
in seconds since era. */
|
|
if (z >= 1
|
|
&& bfd_bread (abfd->tdata.mmo_data->created, 4,
|
|
abfd) != 4)
|
|
goto error_return;
|
|
|
|
for (i = 1; i < z; i++)
|
|
if (bfd_bread (buf, 4, abfd) != 4)
|
|
goto error_return;
|
|
}
|
|
break;
|
|
|
|
case LOP_POST:
|
|
/* This tells of the contents of registers $Z..$255 at
|
|
startup. We make a section out of it, with VMA = Z * 8,
|
|
but only if Z != 255 or the contents is non-zero. */
|
|
{
|
|
asection *rsec;
|
|
bfd_byte *loc;
|
|
bfd_vma first_octa;
|
|
bfd_vma startaddr_octa;
|
|
|
|
/* Read first octaword outside loop to simplify logic when
|
|
excluding the Z == 255, octa == 0 case. */
|
|
if (bfd_bread (buf, 8, abfd) != 8)
|
|
goto error_return;
|
|
|
|
first_octa = bfd_get_64 (abfd, buf);
|
|
|
|
/* Don't emit contents for the trivial case which is
|
|
always present; $255 pointing to Main. */
|
|
if (z != 255)
|
|
{
|
|
rsec
|
|
= bfd_make_section_old_way (abfd,
|
|
MMIX_REG_CONTENTS_SECTION_NAME);
|
|
rsec->flags |= SEC_LINKER_CREATED;
|
|
rsec->vma = z * 8;
|
|
loc = mmo_get_loc (rsec, z * 8, (255 - z) * 8);
|
|
bfd_put_64 (abfd, first_octa, loc);
|
|
|
|
for (i = z + 1; i < 255; i++)
|
|
{
|
|
if (bfd_bread (loc + (i - z) * 8, 8, abfd) != 8)
|
|
goto error_return;
|
|
}
|
|
|
|
/* Read out the last octabyte, and use it to set the
|
|
start address. */
|
|
if (bfd_bread (buf, 8, abfd) != 8)
|
|
goto error_return;
|
|
|
|
startaddr_octa = bfd_get_64 (abfd, buf);
|
|
}
|
|
else
|
|
startaddr_octa = first_octa;
|
|
|
|
if (! bfd_set_start_address (abfd, startaddr_octa))
|
|
{
|
|
/* Currently this can't fail, but this should handle
|
|
future failures. */
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case LOP_STAB:
|
|
/* We read in the symbols now, not later. */
|
|
if (y != 0 || z != 0)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: fields y and z of lop_stab"
|
|
" non-zero, y: %d, z: %d\n"),
|
|
bfd_get_filename (abfd), y, z);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
|
|
/* Save the location, so we can check that YZ in the LOP_END
|
|
is correct. */
|
|
stab_loc = bfd_tell (abfd);
|
|
|
|
/* It's not said that an MMO can be without symbols (though
|
|
mmixal will refuse to assemble files without Main), but
|
|
it seems it would still be a valid mmo-file, so allow it.
|
|
We detect the absence of a symbol area in that the upper
|
|
limit is computed (from the lop_end YZ field) as 0.
|
|
Don't call mmo_get_symbols; it can only detect the end of
|
|
a valid symbol trie, not the absence of one. */
|
|
if (abfd->tdata.mmo_data->max_symbol_length != 0
|
|
&& ! mmo_get_symbols (abfd))
|
|
goto error_return;
|
|
break;
|
|
|
|
case LOP_END:
|
|
{
|
|
/* This must be the last 32-bit word in an mmo file.
|
|
Let's find out. */
|
|
struct stat statbuf;
|
|
file_ptr curpos = bfd_tell (abfd);
|
|
|
|
if (bfd_stat (abfd, &statbuf) < 0)
|
|
goto error_return;
|
|
|
|
if (statbuf.st_size != curpos)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: lop_end not last item in"
|
|
" file\n"),
|
|
bfd_get_filename (abfd));
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
|
|
/* Check that the YZ field is right. Subtract the size of
|
|
this LOP_END in the calculation; YZ does not include
|
|
it. */
|
|
if ((long) (y * 256 + z) * 4 != (curpos - stab_loc) - 4)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid mmo file: YZ of lop_end (%ld)"
|
|
" not equal to the number of tetras to the preceding"
|
|
" lop_stab (%ld)\n"),
|
|
bfd_get_filename (abfd), (long) (y * 256 + z),
|
|
(curpos - stab_loc - 4)/4);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
goto error_return;
|
|
}
|
|
|
|
bfd_map_over_sections (abfd, mmo_map_set_sizes, NULL);
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* This wasn't a lopcode, so store it in the current section. */
|
|
mmo_xore_32 (sec, vma & ~3, bfd_get_32 (abfd, buf));
|
|
vma += 4;
|
|
vma &= ~3;
|
|
lineno++;
|
|
}
|
|
}
|
|
|
|
/* We know this file is a multiple of four bytes (checked in
|
|
mmo_object_p), so if we got something other than 0, this was a bad
|
|
file (although it's more likely we'll get 0 in that case too).
|
|
If we got end-of-file, then there was no lop_stab, so the file has
|
|
invalid format. */
|
|
|
|
if (nbytes_read != 0)
|
|
bfd_set_error (bfd_error_system_call);
|
|
else
|
|
bfd_set_error (bfd_error_bad_value);
|
|
|
|
error_return:
|
|
error = TRUE;
|
|
done:
|
|
/* Mark the .text and .data section with their normal attribute if they
|
|
contain anything. This is not redundant wrt. mmo_decide_section,
|
|
since that code might never execute, and conversely the alloc+code
|
|
section flags must be set then. */
|
|
sec = bfd_get_section_by_name (abfd, MMO_TEXT_SECTION_NAME);
|
|
if (sec != NULL
|
|
&& (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS)
|
|
&& ! bfd_set_section_flags (abfd, sec,
|
|
bfd_get_section_flags (abfd, sec)
|
|
| SEC_ALLOC | SEC_LOAD | SEC_CODE))
|
|
error = TRUE;
|
|
|
|
sec = bfd_get_section_by_name (abfd, MMO_DATA_SECTION_NAME);
|
|
if (sec != NULL
|
|
&& (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS)
|
|
&& ! bfd_set_section_flags (abfd, sec,
|
|
bfd_get_section_flags (abfd, sec)
|
|
| SEC_ALLOC | SEC_LOAD))
|
|
error = TRUE;
|
|
|
|
/* Free whatever resources we took. */
|
|
for (i = 0; i < sizeof (file_names) / sizeof (file_names[0]); i++)
|
|
if (file_names[i])
|
|
free (file_names[i]);
|
|
return ! error;
|
|
}
|
|
|
|
/* A hook to set up object file dependent section information. For mmo,
|
|
we point out the shape of allocated section contents. */
|
|
|
|
static bfd_boolean
|
|
mmo_new_section_hook (bfd *abfd, asection *newsect)
|
|
{
|
|
if (!newsect->used_by_bfd)
|
|
{
|
|
/* We zero-fill all fields and assume NULL is represented by an all
|
|
zero-bit pattern. */
|
|
newsect->used_by_bfd
|
|
= bfd_zalloc (abfd, sizeof (struct mmo_section_data_struct));
|
|
if (!newsect->used_by_bfd)
|
|
return FALSE;
|
|
}
|
|
|
|
/* Always align to at least 32-bit words. */
|
|
newsect->alignment_power = 2;
|
|
return _bfd_generic_new_section_hook (abfd, newsect);
|
|
}
|
|
|
|
/* We already have section contents loaded for sections that have
|
|
contents. */
|
|
|
|
static bfd_boolean
|
|
mmo_get_section_contents (bfd *abfd ATTRIBUTE_UNUSED,
|
|
asection *sec,
|
|
void * location,
|
|
file_ptr offset,
|
|
bfd_size_type bytes_to_do)
|
|
{
|
|
/* Iterate over diminishing chunk sizes, copying contents, like
|
|
mmo_set_section_contents. */
|
|
while (bytes_to_do)
|
|
{
|
|
/* A minor song-and-dance to make sure we're not bitten by the
|
|
distant possibility of the cast from bfd_vma to int making the
|
|
chunk zero-sized. */
|
|
int chunk_size
|
|
= (int) bytes_to_do != 0 ? bytes_to_do : MMO_SEC_CONTENTS_CHUNK_SIZE;
|
|
bfd_byte *loc;
|
|
|
|
do
|
|
loc = mmo_get_loc (sec, sec->vma + offset, chunk_size);
|
|
while (loc == NULL && (chunk_size /= 2) != 0);
|
|
|
|
if (chunk_size == 0)
|
|
return FALSE;
|
|
|
|
memcpy (location, loc, chunk_size);
|
|
|
|
location += chunk_size;
|
|
bytes_to_do -= chunk_size;
|
|
offset += chunk_size;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/* Return the amount of memory needed to read the symbol table. */
|
|
|
|
static long
|
|
mmo_get_symtab_upper_bound (bfd *abfd)
|
|
{
|
|
return (abfd->symcount + 1) * sizeof (asymbol *);
|
|
}
|
|
|
|
/* Sort mmo symbols by serial number. */
|
|
|
|
static int
|
|
mmo_sort_mmo_symbols (const void *arg1, const void *arg2)
|
|
{
|
|
const struct mmo_symbol *sym1 = *(const struct mmo_symbol **) arg1;
|
|
const struct mmo_symbol *sym2 = *(const struct mmo_symbol **) arg2;
|
|
|
|
/* Sort by serial number first. */
|
|
if (sym1->serno < sym2->serno)
|
|
return -1;
|
|
else if (sym1->serno > sym2->serno)
|
|
return 1;
|
|
|
|
/* Then sort by address of the table entries. */
|
|
return ((const char *) arg1 - (const char *) arg2);
|
|
}
|
|
|
|
/* Translate the symbol table. */
|
|
|
|
static long
|
|
mmo_canonicalize_symtab (bfd *abfd, asymbol **alocation)
|
|
{
|
|
unsigned int symcount = bfd_get_symcount (abfd);
|
|
asymbol *csymbols;
|
|
unsigned int i;
|
|
|
|
csymbols = abfd->tdata.mmo_data->csymbols;
|
|
if (csymbols == NULL && symcount != 0)
|
|
{
|
|
asymbol *c;
|
|
struct mmo_symbol *s;
|
|
struct mmo_symbol **msp;
|
|
|
|
/* First we store the symbols into the table we'll return, then we
|
|
qsort it on the serial number, with secondary on the address of
|
|
the symbol, to preserve order if there would be non-unique serial
|
|
numbers. */
|
|
for (s = abfd->tdata.mmo_data->symbols,
|
|
msp = (struct mmo_symbol **) alocation;
|
|
s != NULL;
|
|
s = s->next, ++msp)
|
|
*msp = s;
|
|
|
|
*msp = NULL;
|
|
|
|
qsort (alocation, symcount, sizeof (struct mmo_symbol *),
|
|
mmo_sort_mmo_symbols);
|
|
|
|
csymbols = (asymbol *) bfd_alloc (abfd, symcount * sizeof (asymbol));
|
|
if (csymbols == NULL)
|
|
return -1;
|
|
abfd->tdata.mmo_data->csymbols = csymbols;
|
|
|
|
for (msp = (struct mmo_symbol **) alocation, c = csymbols;
|
|
*msp != NULL;
|
|
msp++, ++c)
|
|
{
|
|
s = *msp;
|
|
c->the_bfd = abfd;
|
|
c->name = s->name;
|
|
c->value = s->value;
|
|
c->flags = BSF_GLOBAL;
|
|
|
|
if (s->sym_type == mmo_data_sym)
|
|
{
|
|
c->section
|
|
= bfd_get_section_by_name (abfd, MMO_DATA_SECTION_NAME);
|
|
|
|
if (c->section == NULL)
|
|
c->section = bfd_abs_section_ptr;
|
|
else
|
|
c->value -= c->section->vma;
|
|
}
|
|
else if (s->sym_type == mmo_undef_sym)
|
|
c->section = bfd_und_section_ptr;
|
|
else if (s->sym_type == mmo_reg_sym)
|
|
{
|
|
c->section
|
|
= bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME);
|
|
c->section->flags |= SEC_LINKER_CREATED;
|
|
}
|
|
else
|
|
{
|
|
asection *textsec
|
|
= bfd_get_section_by_name (abfd, MMO_TEXT_SECTION_NAME);
|
|
asection *datasec;
|
|
|
|
if (textsec != NULL
|
|
&& c->value >= textsec->vma
|
|
&& c->value <= textsec->vma + textsec->size)
|
|
{
|
|
c->section = textsec;
|
|
c->value -= c->section->vma;
|
|
}
|
|
/* In mmo, symbol types depend on the VMA. Therefore, if
|
|
the data section isn't within the usual bounds, its
|
|
symbols are marked as absolute. Correct that. This
|
|
means we can't have absolute symbols with values matching
|
|
data section addresses, but we also can't have with
|
|
absolute symbols with values matching text section
|
|
addresses. For such needs, use the ELF format. */
|
|
else if ((datasec
|
|
= bfd_get_section_by_name (abfd,
|
|
MMO_DATA_SECTION_NAME))
|
|
!= NULL
|
|
&& c->value >= datasec->vma
|
|
&& c->value <= datasec->vma + datasec->size)
|
|
{
|
|
c->section = datasec;
|
|
c->value -= c->section->vma;
|
|
}
|
|
else
|
|
c->section = bfd_abs_section_ptr;
|
|
}
|
|
|
|
c->udata.p = NULL;
|
|
}
|
|
}
|
|
|
|
/* Last, overwrite the incoming table with the right-type entries. */
|
|
for (i = 0; i < symcount; i++)
|
|
*alocation++ = csymbols++;
|
|
*alocation = NULL;
|
|
|
|
return symcount;
|
|
}
|
|
|
|
/* Get information about a symbol. */
|
|
|
|
static void
|
|
mmo_get_symbol_info (bfd *ignore_abfd ATTRIBUTE_UNUSED,
|
|
asymbol *symbol, symbol_info *ret)
|
|
{
|
|
bfd_symbol_info (symbol, ret);
|
|
}
|
|
|
|
static void
|
|
mmo_print_symbol (bfd *abfd, void *afile, asymbol *symbol,
|
|
bfd_print_symbol_type how)
|
|
{
|
|
FILE *file = (FILE *) afile;
|
|
|
|
switch (how)
|
|
{
|
|
case bfd_print_symbol_name:
|
|
fprintf (file, "%s", symbol->name);
|
|
break;
|
|
default:
|
|
bfd_print_symbol_vandf (abfd, file, symbol);
|
|
|
|
fprintf (file, " %-5s %s",
|
|
symbol->section->name,
|
|
symbol->name);
|
|
}
|
|
}
|
|
|
|
/* We can't map a file directly into executable code, so the
|
|
size of header information is irrelevant. */
|
|
|
|
static int
|
|
mmo_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
|
|
struct bfd_link_info *info ATTRIBUTE_UNUSED)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* Write the (section-neutral) file preamble. */
|
|
|
|
static bfd_boolean
|
|
mmo_internal_write_header (bfd *abfd)
|
|
{
|
|
const char lop_pre_bfd[] = { LOP, LOP_PRE, 1, 1};
|
|
|
|
if (bfd_bwrite (lop_pre_bfd, 4, abfd) != 4)
|
|
return FALSE;
|
|
|
|
/* Copy creation time of original file. */
|
|
if (bfd_bwrite (abfd->tdata.mmo_data->created, 4, abfd) != 4)
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Write the LOP_POST record, with global register initializations.
|
|
Z is the Z field of the LOP_POST, corresponding to 255 - number of
|
|
registers at DATA. The Z = 255 field is filled in with the
|
|
start-address. */
|
|
|
|
static bfd_boolean
|
|
mmo_internal_write_post (bfd *abfd, int z, asection *sec)
|
|
{
|
|
int i;
|
|
bfd_byte buf[8];
|
|
mmo_write_tetra_raw (abfd, (LOP << 24) | (LOP_POST << 16) | z);
|
|
|
|
for (i = z; i < 255; i++)
|
|
{
|
|
bfd_byte *data = mmo_get_loc (sec, i * 8, 8);
|
|
|
|
if (bfd_bwrite (data, 8, abfd) != 8)
|
|
return FALSE;
|
|
}
|
|
|
|
/* For Z == $255, we always emit the start location; supposedly Main,
|
|
but we have it handy at bfd_get_start_address. If we're called with
|
|
Z == 255, don't assume DATA is valid. */
|
|
bfd_put_64 (abfd, bfd_get_start_address (abfd), buf);
|
|
|
|
return ! abfd->tdata.mmo_data->have_error && bfd_bwrite (buf, 8, abfd) == 8;
|
|
}
|
|
|
|
/* Translate to and from BFD flags. This is to make sure that we don't
|
|
get bitten by BFD flag number changes. */
|
|
|
|
static flagword
|
|
mmo_sec_flags_from_bfd_flags (flagword flags)
|
|
{
|
|
flagword oflags = 0;
|
|
|
|
if (flags & SEC_ALLOC)
|
|
oflags |= MMO_SEC_ALLOC;
|
|
if (flags & SEC_LOAD)
|
|
oflags |= MMO_SEC_LOAD;
|
|
if (flags & SEC_RELOC)
|
|
oflags |= MMO_SEC_RELOC;
|
|
if (flags & SEC_READONLY)
|
|
oflags |= MMO_SEC_READONLY;
|
|
if (flags & SEC_CODE)
|
|
oflags |= MMO_SEC_CODE;
|
|
if (flags & SEC_DATA)
|
|
oflags |= MMO_SEC_DATA;
|
|
if (flags & SEC_NEVER_LOAD)
|
|
oflags |= MMO_SEC_NEVER_LOAD;
|
|
if (flags & SEC_IS_COMMON)
|
|
oflags |= MMO_SEC_IS_COMMON;
|
|
if (flags & SEC_DEBUGGING)
|
|
oflags |= MMO_SEC_DEBUGGING;
|
|
|
|
return oflags;
|
|
}
|
|
|
|
static flagword
|
|
bfd_sec_flags_from_mmo_flags (flagword flags)
|
|
{
|
|
flagword oflags = 0;
|
|
|
|
if (flags & MMO_SEC_ALLOC)
|
|
oflags |= SEC_ALLOC;
|
|
if (flags & MMO_SEC_LOAD)
|
|
oflags |= SEC_LOAD;
|
|
if (flags & MMO_SEC_RELOC)
|
|
oflags |= SEC_RELOC;
|
|
if (flags & MMO_SEC_READONLY)
|
|
oflags |= SEC_READONLY;
|
|
if (flags & MMO_SEC_CODE)
|
|
oflags |= SEC_CODE;
|
|
if (flags & MMO_SEC_DATA)
|
|
oflags |= SEC_DATA;
|
|
if (flags & MMO_SEC_NEVER_LOAD)
|
|
oflags |= SEC_NEVER_LOAD;
|
|
if (flags & MMO_SEC_IS_COMMON)
|
|
oflags |= SEC_IS_COMMON;
|
|
if (flags & MMO_SEC_DEBUGGING)
|
|
oflags |= SEC_DEBUGGING;
|
|
|
|
return oflags;
|
|
}
|
|
|
|
/* Return TRUE iff the leading or trailing tetrabyte in SEC is defined and
|
|
is 0. */
|
|
|
|
static bfd_boolean
|
|
mmo_has_leading_or_trailing_zero_tetra_p (bfd *abfd, asection *sec)
|
|
{
|
|
bfd_vma secaddr = bfd_get_section_vma (abfd, sec);
|
|
|
|
if (sec->size < 4)
|
|
return FALSE;
|
|
|
|
if (bfd_get_32 (abfd, mmo_get_loc (sec, secaddr, 4)) == 0
|
|
&& bfd_get_32 (abfd,
|
|
mmo_get_loc (sec, secaddr + sec->size - 4, 4)) == 0)
|
|
return TRUE;
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/* Write a section. */
|
|
|
|
static bfd_boolean
|
|
mmo_internal_write_section (bfd *abfd, asection *sec)
|
|
{
|
|
/* We do it differently depending on what section this is:
|
|
|
|
".text": Output, prepended by information about the first source file
|
|
(not yet implemented.)
|
|
|
|
".data": Output.
|
|
|
|
(".MMIX.reg_contents": Not handled here.)
|
|
|
|
Anything else: Output inside a lop_spec 80, in the format described
|
|
above. */
|
|
|
|
if (strcmp (sec->name, MMO_TEXT_SECTION_NAME) == 0)
|
|
{
|
|
bfd_vma secaddr = bfd_get_section_vma (abfd, sec);
|
|
|
|
/* Because leading and trailing zeros are omitted in output, we need to
|
|
specify the section boundaries so they're correct when the file
|
|
is read in again. That's also the case if this section is
|
|
specified as not within its usual boundaries or alignments. */
|
|
if (sec->size != 0
|
|
&& (secaddr + sec->size >= (bfd_vma) 1 << 56
|
|
|| (secaddr & 3) != 0
|
|
|| (sec->size & 3) != 0
|
|
|| mmo_has_leading_or_trailing_zero_tetra_p (abfd, sec)))
|
|
{
|
|
if (!mmo_write_section_description (abfd, sec))
|
|
return FALSE;
|
|
}
|
|
|
|
/* FIXME: Output source file name and line number. */
|
|
return mmo_write_loc_chunk_list (abfd, mmo_section_data (sec)->head);
|
|
}
|
|
else if (strcmp (sec->name, MMO_DATA_SECTION_NAME) == 0)
|
|
{
|
|
bfd_vma secaddr = bfd_get_section_vma (abfd, sec);
|
|
|
|
/* Same goes as for MMO_TEXT_SECTION_NAME above. */
|
|
if (sec->size != 0
|
|
&& (secaddr < (bfd_vma) 0x20 << 56
|
|
|| secaddr + sec->size >= (bfd_vma) 0x21 << 56
|
|
|| (secaddr & 3) != 0
|
|
|| (sec->size & 3) != 0
|
|
|| mmo_has_leading_or_trailing_zero_tetra_p (abfd, sec)))
|
|
{
|
|
if (!mmo_write_section_description (abfd, sec))
|
|
return FALSE;
|
|
}
|
|
|
|
return mmo_write_loc_chunk_list (abfd, mmo_section_data (sec)->head);
|
|
}
|
|
else if (strcmp (sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0)
|
|
/* Not handled here. */
|
|
{
|
|
/* This would normally be an abort call since this can't happen, but
|
|
we don't do that. */
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return FALSE;
|
|
}
|
|
else if (CONST_STRNEQ (sec->name, MMIX_OTHER_SPEC_SECTION_PREFIX))
|
|
{
|
|
int n = atoi (sec->name + strlen (MMIX_OTHER_SPEC_SECTION_PREFIX));
|
|
|
|
mmo_write_tetra_raw (abfd, (LOP << 24) | (LOP_SPEC << 16) | n);
|
|
return (! abfd->tdata.mmo_data->have_error
|
|
&& mmo_write_chunk_list (abfd, mmo_section_data (sec)->head));
|
|
}
|
|
/* Ignore sections that are just allocated or empty; we write out
|
|
_contents_ here. */
|
|
else if ((bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS) != 0
|
|
&& sec->size != 0)
|
|
{
|
|
if (!mmo_write_section_description (abfd, sec))
|
|
return FALSE;
|
|
|
|
/* Writing a LOP_LOC ends the LOP_SPEC data, and makes data actually
|
|
loaded. */
|
|
if (bfd_get_section_flags (abfd, sec) & SEC_LOAD)
|
|
return (! abfd->tdata.mmo_data->have_error
|
|
&& mmo_write_loc_chunk_list (abfd,
|
|
mmo_section_data (sec)->head));
|
|
return (! abfd->tdata.mmo_data->have_error
|
|
&& mmo_write_chunk_list (abfd, mmo_section_data (sec)->head));
|
|
}
|
|
|
|
/* Some section without contents. */
|
|
return TRUE;
|
|
}
|
|
|
|
/* Write the description of a section, extended-mmo-style. */
|
|
|
|
static bfd_boolean
|
|
mmo_write_section_description (bfd *abfd, asection *sec)
|
|
{
|
|
/* Keep the following document-comment formatted the way it is. */
|
|
/*
|
|
INODE
|
|
mmo section mapping, , Symbol-table, mmo
|
|
SUBSECTION
|
|
mmo section mapping
|
|
|
|
The implementation in BFD uses special data type 80 (decimal) to
|
|
encapsulate and describe named sections, containing e.g.@: debug
|
|
information. If needed, any datum in the encapsulation will be
|
|
quoted using lop_quote. First comes a 32-bit word holding the
|
|
number of 32-bit words containing the zero-terminated zero-padded
|
|
segment name. After the name there's a 32-bit word holding flags
|
|
describing the section type. Then comes a 64-bit big-endian word
|
|
with the section length (in bytes), then another with the section
|
|
start address. Depending on the type of section, the contents
|
|
might follow, zero-padded to 32-bit boundary. For a loadable
|
|
section (such as data or code), the contents might follow at some
|
|
later point, not necessarily immediately, as a lop_loc with the
|
|
same start address as in the section description, followed by the
|
|
contents. This in effect forms a descriptor that must be emitted
|
|
before the actual contents. Sections described this way must not
|
|
overlap.
|
|
|
|
For areas that don't have such descriptors, synthetic sections are
|
|
formed by BFD. Consecutive contents in the two memory areas
|
|
@samp{0x0000@dots{}00} to @samp{0x01ff@dots{}ff} and
|
|
@samp{0x2000@dots{}00} to @samp{0x20ff@dots{}ff} are entered in
|
|
sections named <<.text>> and <<.data>> respectively. If an area
|
|
is not otherwise described, but would together with a neighboring
|
|
lower area be less than @samp{0x40000000} bytes long, it is joined
|
|
with the lower area and the gap is zero-filled. For other cases,
|
|
a new section is formed, named <<.MMIX.sec.@var{n}>>. Here,
|
|
@var{n} is a number, a running count through the mmo file,
|
|
starting at 0.
|
|
|
|
EXAMPLE
|
|
A loadable section specified as:
|
|
|
|
| .section secname,"ax"
|
|
| TETRA 1,2,3,4,-1,-2009
|
|
| BYTE 80
|
|
|
|
and linked to address @samp{0x4}, is represented by the sequence:
|
|
|
|
| 0x98080050 - lop_spec 80
|
|
| 0x00000002 - two 32-bit words for the section name
|
|
| 0x7365636e - "secn"
|
|
| 0x616d6500 - "ame\0"
|
|
| 0x00000033 - flags CODE, READONLY, LOAD, ALLOC
|
|
| 0x00000000 - high 32 bits of section length
|
|
| 0x0000001c - section length is 28 bytes; 6 * 4 + 1 + alignment to 32 bits
|
|
| 0x00000000 - high 32 bits of section address
|
|
| 0x00000004 - section address is 4
|
|
| 0x98010002 - 64 bits with address of following data
|
|
| 0x00000000 - high 32 bits of address
|
|
| 0x00000004 - low 32 bits: data starts at address 4
|
|
| 0x00000001 - 1
|
|
| 0x00000002 - 2
|
|
| 0x00000003 - 3
|
|
| 0x00000004 - 4
|
|
| 0xffffffff - -1
|
|
| 0xfffff827 - -2009
|
|
| 0x50000000 - 80 as a byte, padded with zeros.
|
|
|
|
Note that the lop_spec wrapping does not include the section
|
|
contents. Compare this to a non-loaded section specified as:
|
|
|
|
| .section thirdsec
|
|
| TETRA 200001,100002
|
|
| BYTE 38,40
|
|
|
|
This, when linked to address @samp{0x200000000000001c}, is
|
|
represented by:
|
|
|
|
| 0x98080050 - lop_spec 80
|
|
| 0x00000002 - two 32-bit words for the section name
|
|
| 0x7365636e - "thir"
|
|
| 0x616d6500 - "dsec"
|
|
| 0x00000010 - flag READONLY
|
|
| 0x00000000 - high 32 bits of section length
|
|
| 0x0000000c - section length is 12 bytes; 2 * 4 + 2 + alignment to 32 bits
|
|
| 0x20000000 - high 32 bits of address
|
|
| 0x0000001c - low 32 bits of address 0x200000000000001c
|
|
| 0x00030d41 - 200001
|
|
| 0x000186a2 - 100002
|
|
| 0x26280000 - 38, 40 as bytes, padded with zeros
|
|
|
|
For the latter example, the section contents must not be
|
|
loaded in memory, and is therefore specified as part of the
|
|
special data. The address is usually unimportant but might
|
|
provide information for e.g.@: the DWARF 2 debugging format. */
|
|
|
|
mmo_write_tetra_raw (abfd, LOP_SPEC_SECTION);
|
|
mmo_write_tetra (abfd, (strlen (sec->name) + 3) / 4);
|
|
mmo_write_chunk (abfd, (bfd_byte *) sec->name, strlen (sec->name));
|
|
mmo_flush_chunk (abfd);
|
|
/* FIXME: We can get debug sections (.debug_line & Co.) with a section
|
|
flag still having SEC_RELOC set. Investigate. This might be true
|
|
for all alien sections; perhaps mmo.em should clear that flag. Might
|
|
be related to weak references. */
|
|
mmo_write_tetra (abfd,
|
|
mmo_sec_flags_from_bfd_flags
|
|
(bfd_get_section_flags (abfd, sec)));
|
|
mmo_write_octa (abfd, sec->size);
|
|
mmo_write_octa (abfd, bfd_get_section_vma (abfd, sec));
|
|
return TRUE;
|
|
}
|
|
|
|
/* We save up all data before output. */
|
|
|
|
static bfd_boolean
|
|
mmo_set_section_contents (bfd *abfd ATTRIBUTE_UNUSED, sec_ptr sec,
|
|
const void *location, file_ptr offset,
|
|
bfd_size_type bytes_to_do)
|
|
{
|
|
/* Iterate over diminishing chunk sizes, copying contents. */
|
|
while (bytes_to_do)
|
|
{
|
|
/* A minor song-and-dance to make sure we're not bitten by the
|
|
distant possibility of the cast from bfd_vma to int making the
|
|
chunk zero-sized. */
|
|
int chunk_size
|
|
= (int) bytes_to_do != 0 ? bytes_to_do : MMO_SEC_CONTENTS_CHUNK_SIZE;
|
|
bfd_byte *loc;
|
|
|
|
do
|
|
loc = mmo_get_loc (sec, sec->vma + offset, chunk_size);
|
|
while (loc == NULL && (chunk_size /= 2) != 0);
|
|
|
|
if (chunk_size == 0)
|
|
return FALSE;
|
|
|
|
memcpy (loc, location, chunk_size);
|
|
|
|
location += chunk_size;
|
|
bytes_to_do -= chunk_size;
|
|
offset += chunk_size;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/* Add a symbol to a trie-tree. */
|
|
|
|
static bfd_boolean
|
|
mmo_internal_add_3_sym (bfd *abfd, struct mmo_symbol_trie *rootp,
|
|
const struct mmo_symbol *symp)
|
|
{
|
|
const char *name = symp->name;
|
|
struct mmo_symbol_trie *trie = rootp;
|
|
struct mmo_symbol_trie **triep = NULL;
|
|
|
|
while (*name && trie != NULL)
|
|
{
|
|
if (*name < trie->symchar)
|
|
{
|
|
triep = &trie->left;
|
|
trie = trie->left;
|
|
}
|
|
else if (*name > trie->symchar)
|
|
{
|
|
triep = &trie->right;
|
|
trie = trie->right;
|
|
}
|
|
else if (*name == trie->symchar)
|
|
{
|
|
triep = &trie->middle;
|
|
name++;
|
|
|
|
/* Make sure "trie" points to where we should fill in the
|
|
current symbol whenever we've iterated through "name". We
|
|
would lose the right position if we encounter "foobar" then
|
|
"foo". */
|
|
if (*name)
|
|
trie = trie->middle;
|
|
}
|
|
}
|
|
|
|
while (*name != 0)
|
|
{
|
|
/* Create middle branches for the rest of the characters. */
|
|
trie = bfd_zalloc (abfd, sizeof (struct mmo_symbol_trie));
|
|
*triep = trie;
|
|
trie->symchar = *name++;
|
|
triep = &trie->middle;
|
|
}
|
|
|
|
/* We discover a duplicate symbol rather late in the process, but still;
|
|
we discover it and bail out. */
|
|
if (trie->sym.name != NULL)
|
|
{
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid symbol table: duplicate symbol `%s'\n"),
|
|
bfd_get_filename (abfd), trie->sym.name);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return FALSE;
|
|
}
|
|
|
|
memcpy (&trie->sym, symp, sizeof *symp);
|
|
return TRUE;
|
|
}
|
|
|
|
/* Find out the length of the serialized version of a trie in bytes. */
|
|
|
|
static unsigned int
|
|
mmo_internal_3_length (bfd *abfd, struct mmo_symbol_trie *trie)
|
|
{
|
|
/* First, one for the control byte. */
|
|
unsigned int length = 1;
|
|
|
|
if (trie == NULL)
|
|
return 0;
|
|
|
|
/* Add in the recursion to the left. */
|
|
length += mmo_internal_3_length (abfd, trie->left);
|
|
|
|
/* Add in the middle trie and the character. */
|
|
length += 1 + mmo_internal_3_length (abfd, trie->middle);
|
|
|
|
/* Add in the recursion to the right. */
|
|
length += mmo_internal_3_length (abfd, trie->right);
|
|
|
|
/* Add in bytes for the symbol (if this is an endnode). */
|
|
if (trie->sym.name != NULL)
|
|
{
|
|
unsigned int serno = trie->sym.serno;
|
|
|
|
/* First what it takes to encode the value. */
|
|
if (trie->sym.sym_type == mmo_reg_sym)
|
|
length++;
|
|
else if (trie->sym.sym_type == mmo_undef_sym)
|
|
length += 2;
|
|
else
|
|
{
|
|
bfd_vma value = trie->sym.value;
|
|
|
|
/* Coded in one to eight following bytes. */
|
|
if (trie->sym.sym_type == mmo_data_sym)
|
|
value -= (bfd_vma) 0x20 << 56;
|
|
|
|
do
|
|
{
|
|
value >>= 8;
|
|
length++;
|
|
}
|
|
while (value != 0);
|
|
}
|
|
|
|
/* Find out what it takes to encode the serial number. */
|
|
do
|
|
{
|
|
serno >>= 7;
|
|
length++;
|
|
}
|
|
while (serno != 0);
|
|
}
|
|
|
|
return length;
|
|
}
|
|
|
|
/* Helper function for outputting the serial number of a symbol, output as
|
|
a variant of leb128 (see dwarf2 documentation) which could be called
|
|
beb128. Using a helper function and recursion simplifies debugging. */
|
|
|
|
static void
|
|
mmo_beb128_out (bfd *abfd, int serno, int marker)
|
|
{
|
|
if (serno & ~0x7f)
|
|
mmo_beb128_out (abfd, serno >> 7, 0);
|
|
mmo_write_byte (abfd, marker | (serno & 0x7f));
|
|
}
|
|
|
|
/* Serialize a trie. */
|
|
|
|
static void
|
|
mmo_internal_3_dump (bfd *abfd, struct mmo_symbol_trie *trie)
|
|
{
|
|
bfd_byte control = 0;
|
|
|
|
if (trie == NULL)
|
|
return;
|
|
|
|
if (trie->left)
|
|
control |= MMO3_LEFT;
|
|
|
|
if (trie->middle)
|
|
control |= MMO3_MIDDLE;
|
|
|
|
if (trie->right)
|
|
control |= MMO3_RIGHT;
|
|
|
|
if (trie->sym.name != NULL)
|
|
{
|
|
/* Encode the symbol type and length of value bytes. */
|
|
if (trie->sym.sym_type == mmo_reg_sym)
|
|
control |= MMO3_REGQUAL_BITS;
|
|
else if (trie->sym.sym_type == mmo_undef_sym)
|
|
control |= MMO3_UNDEF;
|
|
else
|
|
{
|
|
bfd_vma value = trie->sym.value;
|
|
|
|
/* Coded in 1..8 following bytes. */
|
|
if (trie->sym.sym_type == mmo_data_sym)
|
|
{
|
|
control |= MMO3_DATA;
|
|
value -= (bfd_vma) 0x20 << 56;
|
|
}
|
|
|
|
do
|
|
{
|
|
value >>= 8;
|
|
control++;
|
|
}
|
|
while (value != 0);
|
|
}
|
|
}
|
|
|
|
/* The control byte is output before recursing. */
|
|
mmo_write_byte (abfd, control);
|
|
|
|
mmo_internal_3_dump (abfd, trie->left);
|
|
|
|
if (control & MMO3_SYMBITS)
|
|
{
|
|
mmo_write_byte (abfd, trie->symchar);
|
|
|
|
if (trie->sym.name != NULL)
|
|
{
|
|
if (trie->sym.sym_type == mmo_reg_sym)
|
|
mmo_write_byte (abfd, trie->sym.value);
|
|
else if (trie->sym.sym_type == mmo_undef_sym)
|
|
{
|
|
mmo_write_byte (abfd, 0);
|
|
mmo_write_byte (abfd, 0);
|
|
}
|
|
else
|
|
{
|
|
bfd_vma value = trie->sym.value;
|
|
|
|
bfd_byte byte_n = control & 15;
|
|
|
|
/* Coded in 1..8 following bytes. Note that the value is
|
|
shifted out big-endian. */
|
|
if (trie->sym.sym_type == mmo_data_sym)
|
|
{
|
|
value -= (bfd_vma) 0x20 << 56;
|
|
byte_n -= 8;
|
|
}
|
|
|
|
do
|
|
{
|
|
mmo_write_byte (abfd, (value >> ((byte_n - 1) * 8)) & 0xff);
|
|
byte_n--;
|
|
}
|
|
while (byte_n != 0);
|
|
}
|
|
|
|
mmo_beb128_out (abfd, trie->sym.serno, 128);
|
|
}
|
|
mmo_internal_3_dump (abfd, trie->middle);
|
|
}
|
|
mmo_internal_3_dump (abfd, trie->right);
|
|
}
|
|
|
|
/* Write symbols in mmo format. Also write the lop_end terminator. */
|
|
|
|
static bfd_boolean
|
|
mmo_write_symbols_and_terminator (bfd *abfd)
|
|
{
|
|
int count = bfd_get_symcount (abfd);
|
|
asymbol **table;
|
|
asymbol **orig_table = bfd_get_outsymbols (abfd);
|
|
int serno;
|
|
struct mmo_symbol_trie root;
|
|
int trie_len;
|
|
int i;
|
|
bfd_byte buf[4];
|
|
|
|
/* Create a symbol for "Main". */
|
|
asymbol *fakemain = bfd_make_empty_symbol (abfd);
|
|
|
|
fakemain->flags = BSF_GLOBAL;
|
|
fakemain->value = bfd_get_start_address (abfd);
|
|
fakemain->name = MMIX_START_SYMBOL_NAME;
|
|
fakemain->section = bfd_abs_section_ptr;
|
|
|
|
memset (&root, 0, sizeof (root));
|
|
|
|
/* Make all symbols take a left turn. */
|
|
root.symchar = 0xff;
|
|
|
|
/* There must always be a ":Main", so we'll add one if there are no
|
|
symbols. Make sure we have room for it. */
|
|
table = bfd_alloc (abfd, (count + 1) * sizeof (asymbol *));
|
|
if (table == NULL)
|
|
return FALSE;
|
|
|
|
memcpy (table, orig_table, count * sizeof (asymbol *));
|
|
|
|
/* Move :Main (if there is one) to the first position. This is
|
|
necessary to get the same layout of the trie-tree when linking as
|
|
when objcopying the result as in the objcopy.exp test "simple objcopy
|
|
of executable". It also automatically takes care of assigning serial
|
|
number 1 to :Main (as is mandatory). */
|
|
for (i = 0; i < count; i++)
|
|
if (table[i] != NULL
|
|
&& strcmp (table[i]->name, MMIX_START_SYMBOL_NAME) == 0
|
|
&& (table[i]->flags & (BSF_DEBUGGING|BSF_GLOBAL)) == BSF_GLOBAL)
|
|
{
|
|
asymbol *mainsym = table[i];
|
|
memcpy (table + 1, orig_table, i * sizeof (asymbol *));
|
|
table[0] = mainsym;
|
|
|
|
/* Check that the value assigned to :Main is the same as the entry
|
|
address. The default linker script asserts this. This is as
|
|
good a place as any to check this consistency. */
|
|
if ((mainsym->value
|
|
+ mainsym->section->output_section->vma
|
|
+ mainsym->section->output_offset)
|
|
!= bfd_get_start_address (abfd))
|
|
{
|
|
/* Arbitrary buffer to hold the printable representation of a
|
|
vma. */
|
|
char vmas_main[40];
|
|
char vmas_start[40];
|
|
bfd_vma vma_start = bfd_get_start_address (abfd);
|
|
|
|
sprintf_vma (vmas_main, mainsym->value);
|
|
sprintf_vma (vmas_start, vma_start);
|
|
|
|
(*_bfd_error_handler)
|
|
(_("%s: Bad symbol definition: `Main' set to %s rather"
|
|
" than the start address %s\n"),
|
|
bfd_get_filename (abfd), vmas_main, vmas_start);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return FALSE;
|
|
}
|
|
break;
|
|
}
|
|
if (i == count && count != 0)
|
|
{
|
|
/* When there are symbols, there must be a :Main. There was no
|
|
:Main, so we need to add it manually. */
|
|
memcpy (table + 1, orig_table, count * sizeof (asymbol *));
|
|
table[0] = fakemain;
|
|
count++;
|
|
}
|
|
|
|
for (i = 0, serno = 1; i < count && table[i] != NULL; i++)
|
|
{
|
|
asymbol *s = table[i];
|
|
|
|
/* It's not enough to consult bfd_is_local_label, since it does not
|
|
mean "local" in the sense of linkable-and-observable-after-link.
|
|
Let's just check the BSF_GLOBAL flag.
|
|
|
|
Also, don't export symbols with characters not in the allowed set. */
|
|
if ((s->flags & (BSF_DEBUGGING|BSF_GLOBAL)) == BSF_GLOBAL
|
|
&& strspn (s->name,
|
|
valid_mmo_symbol_character_set) == strlen (s->name))
|
|
{
|
|
struct mmo_symbol sym;
|
|
memset (&sym, 0, sizeof (sym));
|
|
|
|
/* Need to strip const here; strdup:ing would leak and the
|
|
existing string must be safe to reuse. */
|
|
sym.name = (char *) s->name;
|
|
sym.value =
|
|
s->value
|
|
+ s->section->output_section->vma
|
|
+ s->section->output_offset;
|
|
|
|
if (bfd_is_und_section (s->section))
|
|
sym.sym_type = mmo_undef_sym;
|
|
else if (strcmp (s->section->name, MMO_DATA_SECTION_NAME) == 0
|
|
/* The encoding of data symbols require that the "rest"
|
|
of the value fits in 6 bytes, so the upper two bytes
|
|
must be 0x2000. All other symbols get to be the
|
|
absolute type. */
|
|
&& (sym.value >> 48) == 0x2000)
|
|
sym.sym_type = mmo_data_sym;
|
|
else if (strcmp (s->section->name, MMIX_REG_SECTION_NAME) == 0)
|
|
sym.sym_type = mmo_reg_sym;
|
|
else if (strcmp (s->section->name,
|
|
MMIX_REG_CONTENTS_SECTION_NAME) == 0)
|
|
{
|
|
sym.sym_type = mmo_reg_sym;
|
|
sym.value /= 8;
|
|
}
|
|
else
|
|
sym.sym_type = mmo_abs_sym;
|
|
|
|
/* FIXME: We assume the order of the received symbols is an
|
|
ordered mapping of the serial numbers. This is not
|
|
necessarily true if we e.g. objcopy a mmo file to another and
|
|
there are gaps in the numbering. Not sure if this can
|
|
happen. Not sure what to do. */
|
|
sym.serno = serno++;
|
|
|
|
if (! mmo_internal_add_3_sym (abfd, &root, &sym))
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* Change the root node to be a ":"-prefix. */
|
|
root.symchar = ':';
|
|
root.middle = root.left;
|
|
root.right = NULL;
|
|
root.left = NULL;
|
|
|
|
/* We have to find out if we can fit the whole symbol table in the mmo
|
|
symtab. It would be bad to assume we can always fit it in 262144
|
|
bytes. If we can't, just leave the Main symbol. */
|
|
trie_len = (mmo_internal_3_length (abfd, &root) + 3)/4;
|
|
|
|
if (trie_len > 0xffff)
|
|
{
|
|
/* Test this code by using a lower limit in the test above and check
|
|
that the single "Main" symbol is emitted and handled properly.
|
|
There's no specific test-case. */
|
|
struct mmo_symbol sym;
|
|
|
|
(*_bfd_error_handler)
|
|
(_("%s: warning: symbol table too large for mmo, larger than 65535"
|
|
" 32-bit words: %d. Only `Main' will be emitted.\n"),
|
|
bfd_get_filename (abfd), trie_len);
|
|
|
|
memset (&sym, 0, sizeof (sym));
|
|
sym.sym_type = mmo_abs_sym;
|
|
sym.name = MMIX_START_SYMBOL_NAME;
|
|
sym.serno = 1;
|
|
sym.value = bfd_get_start_address (abfd);
|
|
|
|
/* Then patch up a symbol table to be just the ":Main" symbol. */
|
|
memset (&root, 0, sizeof (root));
|
|
root.left = root.middle;
|
|
root.symchar = 0xff;
|
|
root.middle = NULL;
|
|
root.right = NULL;
|
|
|
|
if (! mmo_internal_add_3_sym (abfd, &root, &sym))
|
|
return FALSE;
|
|
|
|
root.symchar = ':';
|
|
root.middle = root.left;
|
|
root.right = NULL;
|
|
root.left = NULL;
|
|
|
|
trie_len = (mmo_internal_3_length (abfd, &root) + 3)/4;
|
|
}
|
|
|
|
/* Reset the written-bytes counter. */
|
|
abfd->tdata.mmo_data->byte_no = 0;
|
|
|
|
/* Put out the lop_stab mark. */
|
|
bfd_put_32 (abfd, (LOP << 24) | (LOP_STAB << 16), buf);
|
|
if (bfd_bwrite (buf, 4, abfd) != 4)
|
|
return FALSE;
|
|
|
|
/* Dump out symbols. */
|
|
mmo_internal_3_dump (abfd, &root);
|
|
|
|
if (trie_len != (abfd->tdata.mmo_data->byte_no + 3)/4)
|
|
{
|
|
/* I haven't seen this trig. It seems no use claiming this case
|
|
isn't debugged and abort if we get here. Instead emit a
|
|
diagnostic and fail "normally". */
|
|
(*_bfd_error_handler)
|
|
(_("%s: internal error, symbol table changed size from %d to %d"
|
|
" words\n"),
|
|
bfd_get_filename (abfd), trie_len,
|
|
(abfd->tdata.mmo_data->byte_no + 3)/4);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Dump out remaining bytes in the buffer and handle I/O errors by
|
|
propagating errors. */
|
|
if ((abfd->tdata.mmo_data->byte_no % 4) != 0
|
|
|| abfd->tdata.mmo_data->have_error)
|
|
{
|
|
memset (abfd->tdata.mmo_data->buf + (abfd->tdata.mmo_data->byte_no % 4),
|
|
0, 4 - (abfd->tdata.mmo_data->byte_no % 4));
|
|
|
|
if (abfd->tdata.mmo_data->have_error
|
|
|| bfd_bwrite (abfd->tdata.mmo_data->buf, 4, abfd) != 4)
|
|
return FALSE;
|
|
}
|
|
|
|
bfd_put_32 (abfd, (LOP << 24) | (LOP_END << 16) | trie_len, buf);
|
|
return bfd_bwrite (buf, 4, abfd) == 4;
|
|
}
|
|
|
|
/* Write section unless it is the register contents section. For that, we
|
|
instead store the section in the supplied pointer. This function is
|
|
used through bfd_map_over_sections. */
|
|
|
|
static void
|
|
mmo_write_section_unless_reg_contents (bfd *abfd, asection *sec, void *p)
|
|
{
|
|
struct mmo_write_sec_info *infop = (struct mmo_write_sec_info *) p;
|
|
|
|
if (! infop->retval)
|
|
return;
|
|
|
|
if (strcmp (sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0)
|
|
{
|
|
infop->reg_section = sec;
|
|
return;
|
|
}
|
|
|
|
/* Exclude the convenience register section. */
|
|
if (strcmp (sec->name, MMIX_REG_SECTION_NAME) == 0)
|
|
{
|
|
if (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS)
|
|
{
|
|
/* Make sure it hasn't got contents. It seems impossible to
|
|
make it carry contents, so we don't have a test-case for
|
|
this. */
|
|
(*_bfd_error_handler)
|
|
(_("%s: internal error, internal register section %s had"
|
|
" contents\n"),
|
|
bfd_get_filename (abfd), sec->name);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
infop->retval = FALSE;
|
|
return;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
infop->retval = mmo_internal_write_section (abfd, sec);
|
|
}
|
|
|
|
/* Do the actual output of a file. Assumes mmo_set_section_contents is
|
|
already called. */
|
|
|
|
static bfd_boolean
|
|
mmo_write_object_contents (bfd *abfd)
|
|
{
|
|
struct mmo_write_sec_info wsecinfo;
|
|
|
|
/* First, there are a few words of preamble. */
|
|
if (! mmo_internal_write_header (abfd))
|
|
return FALSE;
|
|
|
|
wsecinfo.reg_section = NULL;
|
|
wsecinfo.retval = TRUE;
|
|
|
|
bfd_map_over_sections (abfd, mmo_write_section_unless_reg_contents,
|
|
&wsecinfo);
|
|
|
|
if (! wsecinfo.retval)
|
|
return FALSE;
|
|
|
|
if (wsecinfo.reg_section != NULL)
|
|
{
|
|
asection *sec = wsecinfo.reg_section;
|
|
unsigned int z = (unsigned int) (sec->vma / 8);
|
|
|
|
/* Registers 0..31 must not be global. Do sanity check on the "vma"
|
|
of the register contents section and check that it corresponds to
|
|
the length of the section. */
|
|
if (z < 32 || z >= 255 || (sec->vma & 7) != 0
|
|
|| sec->vma != 256 * 8 - sec->size - 8)
|
|
{
|
|
bfd_set_error (bfd_error_bad_value);
|
|
|
|
if (sec->size == 0)
|
|
/* There must always be at least one such register. */
|
|
(*_bfd_error_handler)
|
|
(_("%s: no initialized registers; section length 0\n"),
|
|
bfd_get_filename (abfd));
|
|
else if (sec->vma > (256 - 32) * 8)
|
|
/* Provide better error message for the case of too many
|
|
global registers. */
|
|
(*_bfd_error_handler)
|
|
(_("%s: too many initialized registers; section length %ld\n"),
|
|
bfd_get_filename (abfd),
|
|
(long) sec->size);
|
|
else
|
|
(*_bfd_error_handler)
|
|
(_("%s: invalid start address for initialized registers of"
|
|
" length %ld: 0x%lx%08lx\n"),
|
|
bfd_get_filename (abfd),
|
|
(long) sec->size,
|
|
(unsigned long) (sec->vma >> 32), (unsigned long) (sec->vma));
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
if (! mmo_internal_write_post (abfd, z, sec))
|
|
return FALSE;
|
|
}
|
|
else
|
|
if (! mmo_internal_write_post (abfd, 255, NULL))
|
|
return FALSE;
|
|
|
|
return mmo_write_symbols_and_terminator (abfd);
|
|
}
|
|
|
|
/* If there's anything in particular in a mmo bfd that we want to free,
|
|
make this a real function. Only do this if you see major memory
|
|
thrashing; zealous free:ing will cause unwanted behavior, especially if
|
|
you "free" memory allocated with "bfd_alloc", or even "bfd_release" a
|
|
block allocated with "bfd_alloc"; they're really allocated from an
|
|
obstack, and we don't know what was allocated there since this
|
|
particular allocation. */
|
|
|
|
#define mmo_close_and_cleanup _bfd_generic_close_and_cleanup
|
|
#define mmo_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
|
|
|
|
/* Perhaps we need to adjust this one; mmo labels (originally) without a
|
|
leading ':' might more appropriately be called local. */
|
|
#define mmo_bfd_is_local_label_name bfd_generic_is_local_label_name
|
|
#define mmo_bfd_is_target_special_symbol \
|
|
((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
|
|
|
|
/* Is this one really used or defined by anyone? */
|
|
#define mmo_get_lineno _bfd_nosymbols_get_lineno
|
|
|
|
/* FIXME: We can do better on this one, if we have a dwarf2 .debug_line
|
|
section or if MMO line numbers are implemented. */
|
|
#define mmo_find_nearest_line _bfd_nosymbols_find_nearest_line
|
|
#define mmo_find_line _bfd_nosymbols_find_line
|
|
#define mmo_find_inliner_info _bfd_nosymbols_find_inliner_info
|
|
#define mmo_make_empty_symbol _bfd_generic_make_empty_symbol
|
|
#define mmo_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
|
|
#define mmo_read_minisymbols _bfd_generic_read_minisymbols
|
|
#define mmo_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
|
|
|
|
#define mmo_get_section_contents_in_window \
|
|
_bfd_generic_get_section_contents_in_window
|
|
#define mmo_bfd_get_relocated_section_contents \
|
|
bfd_generic_get_relocated_section_contents
|
|
#define mmo_bfd_gc_sections bfd_generic_gc_sections
|
|
#define mmo_bfd_lookup_section_flags bfd_generic_lookup_section_flags
|
|
#define mmo_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
|
|
#define mmo_bfd_link_add_symbols _bfd_generic_link_add_symbols
|
|
#define mmo_bfd_link_just_syms _bfd_generic_link_just_syms
|
|
#define mmo_bfd_copy_link_hash_symbol_type \
|
|
_bfd_generic_copy_link_hash_symbol_type
|
|
#define mmo_bfd_final_link _bfd_generic_final_link
|
|
#define mmo_bfd_link_split_section _bfd_generic_link_split_section
|
|
|
|
/* Strictly speaking, only MMIX uses this restricted format, but let's not
|
|
stop anybody from shooting themselves in the foot. */
|
|
#define mmo_set_arch_mach bfd_default_set_arch_mach
|
|
#define mmo_bfd_relax_section bfd_generic_relax_section
|
|
#define mmo_bfd_merge_sections bfd_generic_merge_sections
|
|
#define mmo_bfd_is_group_section bfd_generic_is_group_section
|
|
#define mmo_bfd_discard_group bfd_generic_discard_group
|
|
#define mmo_section_already_linked \
|
|
_bfd_generic_section_already_linked
|
|
#define mmo_bfd_define_common_symbol bfd_generic_define_common_symbol
|
|
|
|
/* We want to copy time of creation, otherwise we'd use
|
|
BFD_JUMP_TABLE_COPY (_bfd_generic). */
|
|
#define mmo_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data
|
|
#define mmo_bfd_copy_private_section_data _bfd_generic_bfd_copy_private_section_data
|
|
#define mmo_bfd_copy_private_symbol_data _bfd_generic_bfd_copy_private_symbol_data
|
|
#define mmo_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data
|
|
#define mmo_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
|
|
#define mmo_bfd_print_private_bfd_data _bfd_generic_bfd_print_private_bfd_data
|
|
|
|
const bfd_target mmix_mmo_vec =
|
|
{
|
|
"mmo", /* name */
|
|
bfd_target_mmo_flavour,
|
|
BFD_ENDIAN_BIG, /* target byte order */
|
|
BFD_ENDIAN_BIG, /* target headers byte order */
|
|
|
|
/* FIXME: Might need adjustments. */
|
|
(HAS_RELOC | EXEC_P | /* object flags */
|
|
HAS_LINENO | HAS_DEBUG |
|
|
HAS_SYMS | HAS_LOCALS | WP_TEXT),
|
|
|
|
/* FIXME: Might need adjustments. */
|
|
(SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD
|
|
| SEC_READONLY | SEC_EXCLUDE | SEC_DEBUGGING | SEC_IN_MEMORY),
|
|
/* section flags */
|
|
0, /* leading underscore */
|
|
' ', /* ar_pad_char */
|
|
16, /* ar_max_namelen */
|
|
0, /* match priority. */
|
|
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
|
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
|
bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
|
|
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
|
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
|
bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
|
|
|
|
{
|
|
_bfd_dummy_target,
|
|
mmo_object_p, /* bfd_check_format */
|
|
_bfd_dummy_target,
|
|
_bfd_dummy_target,
|
|
},
|
|
{
|
|
bfd_false,
|
|
mmo_mkobject,
|
|
bfd_false,
|
|
bfd_false,
|
|
},
|
|
{ /* bfd_write_contents */
|
|
bfd_false,
|
|
mmo_write_object_contents,
|
|
bfd_false,
|
|
bfd_false,
|
|
},
|
|
|
|
BFD_JUMP_TABLE_GENERIC (mmo),
|
|
BFD_JUMP_TABLE_COPY (mmo),
|
|
BFD_JUMP_TABLE_CORE (_bfd_nocore),
|
|
BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
|
|
BFD_JUMP_TABLE_SYMBOLS (mmo),
|
|
BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
|
|
BFD_JUMP_TABLE_WRITE (mmo),
|
|
BFD_JUMP_TABLE_LINK (mmo),
|
|
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
|
|
|
|
NULL,
|
|
|
|
NULL
|
|
};
|