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https://github.com/autc04/Retro68.git
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321 lines
8.4 KiB
C
321 lines
8.4 KiB
C
/* coff information for 80960. Origins: Intel corp, natch.
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Copyright (C) 2001-2014 Free Software Foundation, Inc.
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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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/* NOTE: Tagentries (cf TAGBITS) are no longer used by the 960 */
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/********************** FILE HEADER **********************/
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struct external_filehdr
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{
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char f_magic[2]; /* magic number */
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char f_nscns[2]; /* number of sections */
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char f_timdat[4]; /* time & date stamp */
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char f_symptr[4]; /* file pointer to symtab */
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char f_nsyms[4]; /* number of symtab entries */
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char f_opthdr[2]; /* sizeof(optional hdr) */
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char f_flags[2]; /* flags */
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};
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#define OMAGIC (0407) /* old impure format. data immediately
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follows text. both sections are rw. */
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#define NMAGIC (0410) /* split i&d, read-only text */
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/*
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* Intel 80960 (I960) processor flags.
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* F_I960TYPE == mask for processor type field.
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*/
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#define F_I960TYPE (0xf000)
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#define F_I960CORE (0x1000)
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#define F_I960KB (0x2000)
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#define F_I960SB (0x2000)
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#define F_I960MC (0x3000)
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#define F_I960XA (0x4000)
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#define F_I960CA (0x5000)
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#define F_I960KA (0x6000)
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#define F_I960SA (0x6000)
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#define F_I960JX (0x7000)
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#define F_I960HX (0x8000)
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/** i80960 Magic Numbers
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*/
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#define I960ROMAGIC (0x160) /* read-only text segments */
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#define I960RWMAGIC (0x161) /* read-write text segments */
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#define I960BADMAG(x) (((x).f_magic!=I960ROMAGIC) && ((x).f_magic!=I960RWMAGIC))
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#define FILHDR struct external_filehdr
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#define FILHSZ 20
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/********************** AOUT "OPTIONAL HEADER" **********************/
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typedef struct
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{
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unsigned long phys_addr;
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unsigned long bitarray;
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} TAGBITS;
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typedef struct
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{
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char magic[2]; /* type of file */
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char vstamp[2]; /* version stamp */
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char tsize[4]; /* text size in bytes, padded to FW bdry*/
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char dsize[4]; /* initialized data " " */
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char bsize[4]; /* uninitialized data " " */
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char entry[4]; /* entry pt. */
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char text_start[4]; /* base of text used for this file */
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char data_start[4]; /* base of data used for this file */
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char tagentries[4]; /* number of tag entries to follow */
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}
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AOUTHDR;
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/* return a pointer to the tag bits array */
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#define TAGPTR(aout) ((TAGBITS *) (&(aout.tagentries)+1))
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/* compute size of a header */
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/*#define AOUTSZ(aout) (sizeof(AOUTHDR)+(aout.tagentries*sizeof(TAGBITS)))*/
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#define AOUTSZ 32
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#define AOUTHDRSZ 32
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/********************** SECTION HEADER **********************/
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struct external_scnhdr
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{
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char s_name[8]; /* section name */
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char s_paddr[4]; /* physical address, aliased s_nlib */
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char s_vaddr[4]; /* virtual address */
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char s_size[4]; /* section size */
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char s_scnptr[4]; /* file ptr to raw data for section */
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char s_relptr[4]; /* file ptr to relocation */
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char s_lnnoptr[4]; /* file ptr to line numbers */
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char s_nreloc[2]; /* number of relocation entries */
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char s_nlnno[2]; /* number of line number entries*/
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char s_flags[4]; /* flags */
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char s_align[4]; /* section alignment */
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};
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#define SCNHDR struct external_scnhdr
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#define SCNHSZ 44
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/*
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* names of "special" sections
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*/
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#define _TEXT ".text"
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#define _DATA ".data"
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#define _BSS ".bss"
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/********************** LINE NUMBERS **********************/
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/* 1 line number entry for every "breakpointable" source line in a section.
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* Line numbers are grouped on a per function basis; first entry in a function
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* grouping will have l_lnno = 0 and in place of physical address will be the
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* symbol table index of the function name.
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*/
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struct external_lineno
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{
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union
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{
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char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
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char l_paddr[4]; /* (physical) address of line number */
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} l_addr;
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char l_lnno[2]; /* line number */
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char padding[2]; /* force alignment */
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};
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#define LINENO struct external_lineno
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#define LINESZ 8
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/********************** SYMBOLS **********************/
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#define E_SYMNMLEN 8 /* # characters in a symbol name */
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#define E_FILNMLEN 14 /* # characters in a file name */
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#define E_DIMNUM 4 /* # array dimensions in auxiliary entry */
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struct external_syment
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{
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union
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{
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char e_name[E_SYMNMLEN];
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struct
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{
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char e_zeroes[4];
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char e_offset[4];
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} e;
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} e;
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char e_value[4];
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char e_scnum[2];
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char e_flags[2];
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char e_type[4];
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char e_sclass[1];
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char e_numaux[1];
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char pad2[2];
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};
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#define N_BTMASK (0x1f)
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#define N_TMASK (0x60)
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#define N_BTSHFT (5)
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#define N_TSHIFT (2)
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union external_auxent
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{
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struct
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{
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char x_tagndx[4]; /* str, un, or enum tag indx */
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union
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{
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struct
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{
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char x_lnno[2]; /* declaration line number */
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char x_size[2]; /* str/union/array size */
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} x_lnsz;
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char x_fsize[4]; /* size of function */
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} x_misc;
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union
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{
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struct /* if ISFCN, tag, or .bb */
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{
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char x_lnnoptr[4]; /* ptr to fcn line # */
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char x_endndx[4]; /* entry ndx past block end */
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} x_fcn;
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struct /* if ISARY, up to 4 dimen. */
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{
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char x_dimen[E_DIMNUM][2];
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} x_ary;
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} x_fcnary;
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char x_tvndx[2]; /* tv index */
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} x_sym;
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union
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{
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char x_fname[E_FILNMLEN];
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struct
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{
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char x_zeroes[4];
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char x_offset[4];
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} x_n;
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} x_file;
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struct
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{
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char x_scnlen[4]; /* section length */
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char x_nreloc[2]; /* # relocation entries */
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char x_nlinno[2]; /* # line numbers */
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} x_scn;
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struct
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{
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char x_tvfill[4]; /* tv fill value */
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char x_tvlen[2]; /* length of .tv */
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char x_tvran[2][2]; /* tv range */
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} x_tv; /* info about .tv section (in auxent of symbol .tv)) */
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/******************************************
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* I960-specific *2nd* aux. entry formats
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******************************************/
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struct
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{
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/* This is a very old typo that keeps getting propagated. */
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#define x_stdindx x_stindx
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char x_stindx[4]; /* sys. table entry */
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} x_sc; /* system call entry */
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struct
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{
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char x_balntry[4]; /* BAL entry point */
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} x_bal; /* BAL-callable function */
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struct
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{
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char x_timestamp[4]; /* time stamp */
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char x_idstring[20]; /* producer identity string */
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} x_ident; /* Producer ident info */
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};
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#define SYMENT struct external_syment
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#define SYMESZ 24
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#define AUXENT union external_auxent
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#define AUXESZ 24
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# define _ETEXT "_etext"
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/********************** RELOCATION DIRECTIVES **********************/
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struct external_reloc
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{
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char r_vaddr[4];
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char r_symndx[4];
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char r_type[2];
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char pad[2];
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};
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/* r_type values for the i960. */
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/* The i960 uses R_RELLONG, which is defined in internal.h as 0x11.
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It is an absolute 32 bit relocation. */
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#define R_IPRMED (0x19) /* 24-bit ip-relative relocation */
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#define R_OPTCALL (0x1b) /* 32-bit optimizable call (leafproc/sysproc) */
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#define R_OPTCALLX (0x1c) /* 64-bit optimizable call (leafproc/sysproc) */
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/* The following relocation types are defined use by relaxing linkers,
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which convert 32 bit calls (which require a 64 bit instruction)
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into 24 bit calls (which require a 32 bit instruction) when
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possible. It will be possible whenever the target of the call is
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within a 24 bit range of the call instruction.
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It is always safe to ignore these relocations. They only serve to
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mark points which the relaxing linker will have to consider. The
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assembler must ensure that the correct code is generated even if
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the relocations are ignored. In particular, this means that the
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R_IPR13 relocation may not appear with an external symbol. */
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#define R_IPR13 (0x1d) /* 13 bit ip-relative branch */
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#define R_ALIGN (0x1e) /* alignment marker. This has no
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associated symbol. Instead, the
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r_symndx field indicates the
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require alignment at this point in
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the file. It must be a power of 2. */
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#define RELOC struct external_reloc
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#define RELSZ 12
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