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346 lines
10 KiB
Plaintext
346 lines
10 KiB
Plaintext
@c Copyright (C) 1991-2014 Free Software Foundation, Inc.
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@c This is part of the GAS manual.
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@c For copying conditions, see the file as.texinfo.
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@page
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@node SH-Dependent
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@chapter Renesas / SuperH SH Dependent Features
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@cindex SH support
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@menu
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* SH Options:: Options
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* SH Syntax:: Syntax
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* SH Floating Point:: Floating Point
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* SH Directives:: SH Machine Directives
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* SH Opcodes:: Opcodes
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@end menu
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@node SH Options
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@section Options
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@cindex SH options
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@cindex options, SH
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@code{@value{AS}} has following command-line options for the Renesas
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(formerly Hitachi) / SuperH SH family.
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@table @code
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@kindex --little
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@kindex --big
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@kindex --relax
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@kindex --small
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@kindex --dsp
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@kindex --renesas
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@kindex --allow-reg-prefix
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@item --little
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Generate little endian code.
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@item --big
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Generate big endian code.
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@item --relax
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Alter jump instructions for long displacements.
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@item --small
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Align sections to 4 byte boundaries, not 16.
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@item --dsp
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Enable sh-dsp insns, and disable sh3e / sh4 insns.
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@item --renesas
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Disable optimization with section symbol for compatibility with
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Renesas assembler.
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@item --allow-reg-prefix
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Allow '$' as a register name prefix.
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@kindex --fdpic
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@item --fdpic
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Generate an FDPIC object file.
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@item --isa=sh4 | sh4a
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Specify the sh4 or sh4a instruction set.
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@item --isa=dsp
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Enable sh-dsp insns, and disable sh3e / sh4 insns.
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@item --isa=fp
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Enable sh2e, sh3e, sh4, and sh4a insn sets.
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@item --isa=all
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Enable sh1, sh2, sh2e, sh3, sh3e, sh4, sh4a, and sh-dsp insn sets.
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@item -h-tick-hex
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Support H'00 style hex constants in addition to 0x00 style.
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@end table
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@node SH Syntax
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@section Syntax
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@menu
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* SH-Chars:: Special Characters
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* SH-Regs:: Register Names
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* SH-Addressing:: Addressing Modes
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@end menu
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@node SH-Chars
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@subsection Special Characters
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@cindex line comment character, SH
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@cindex SH line comment character
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@samp{!} is the line comment character.
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@cindex line separator, SH
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@cindex statement separator, SH
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@cindex SH line separator
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You can use @samp{;} instead of a newline to separate statements.
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If a @samp{#} appears as the first character of a line then the whole
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line is treated as a comment, but in this case the line could also be
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a logical line number directive (@pxref{Comments}) or a preprocessor
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control command (@pxref{Preprocessing}).
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@cindex symbol names, @samp{$} in
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@cindex @code{$} in symbol names
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Since @samp{$} has no special meaning, you may use it in symbol names.
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@node SH-Regs
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@subsection Register Names
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@cindex SH registers
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@cindex registers, SH
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You can use the predefined symbols @samp{r0}, @samp{r1}, @samp{r2},
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@samp{r3}, @samp{r4}, @samp{r5}, @samp{r6}, @samp{r7}, @samp{r8},
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@samp{r9}, @samp{r10}, @samp{r11}, @samp{r12}, @samp{r13}, @samp{r14},
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and @samp{r15} to refer to the SH registers.
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The SH also has these control registers:
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@table @code
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@item pr
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procedure register (holds return address)
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@item pc
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program counter
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@item mach
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@itemx macl
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high and low multiply accumulator registers
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@item sr
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status register
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@item gbr
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global base register
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@item vbr
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vector base register (for interrupt vectors)
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@end table
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@node SH-Addressing
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@subsection Addressing Modes
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@cindex addressing modes, SH
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@cindex SH addressing modes
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@code{@value{AS}} understands the following addressing modes for the SH.
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@code{R@var{n}} in the following refers to any of the numbered
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registers, but @emph{not} the control registers.
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@table @code
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@item R@var{n}
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Register direct
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@item @@R@var{n}
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Register indirect
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@item @@-R@var{n}
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Register indirect with pre-decrement
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@item @@R@var{n}+
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Register indirect with post-increment
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@item @@(@var{disp}, R@var{n})
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Register indirect with displacement
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@item @@(R0, R@var{n})
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Register indexed
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@item @@(@var{disp}, GBR)
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@code{GBR} offset
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@item @@(R0, GBR)
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GBR indexed
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@item @var{addr}
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@itemx @@(@var{disp}, PC)
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PC relative address (for branch or for addressing memory). The
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@code{@value{AS}} implementation allows you to use the simpler form
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@var{addr} anywhere a PC relative address is called for; the alternate
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form is supported for compatibility with other assemblers.
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@item #@var{imm}
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Immediate data
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@end table
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@node SH Floating Point
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@section Floating Point
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@cindex floating point, SH (@sc{ieee})
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@cindex SH floating point (@sc{ieee})
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SH2E, SH3E and SH4 groups have on-chip floating-point unit (FPU). Other
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SH groups can use @code{.float} directive to generate @sc{ieee}
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floating-point numbers.
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SH2E and SH3E support single-precision floating point calculations as
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well as entirely PCAPI compatible emulation of double-precision
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floating point calculations. SH2E and SH3E instructions are a subset of
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the floating point calculations conforming to the IEEE754 standard.
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In addition to single-precision and double-precision floating-point
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operation capability, the on-chip FPU of SH4 has a 128-bit graphic
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engine that enables 32-bit floating-point data to be processed 128
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bits at a time. It also supports 4 * 4 array operations and inner
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product operations. Also, a superscalar architecture is employed that
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enables simultaneous execution of two instructions (including FPU
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instructions), providing performance of up to twice that of
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conventional architectures at the same frequency.
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@node SH Directives
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@section SH Machine Directives
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@cindex SH machine directives
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@cindex machine directives, SH
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@cindex @code{uaword} directive, SH
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@cindex @code{ualong} directive, SH
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@cindex @code{uaquad} directive, SH
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@table @code
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@item uaword
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@itemx ualong
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@itemx uaquad
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@code{@value{AS}} will issue a warning when a misaligned @code{.word},
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@code{.long}, or @code{.quad} directive is used. You may use
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@code{.uaword}, @code{.ualong}, or @code{.uaquad} to indicate that the
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value is intentionally misaligned.
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@end table
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@node SH Opcodes
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@section Opcodes
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@cindex SH opcode summary
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@cindex opcode summary, SH
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@cindex mnemonics, SH
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@cindex instruction summary, SH
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For detailed information on the SH machine instruction set, see
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@cite{SH-Microcomputer User's Manual} (Renesas) or
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@cite{SH-4 32-bit CPU Core Architecture} (SuperH) and
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@cite{SuperH (SH) 64-Bit RISC Series} (SuperH).
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@code{@value{AS}} implements all the standard SH opcodes. No additional
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pseudo-instructions are needed on this family. Note, however, that
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because @code{@value{AS}} supports a simpler form of PC-relative
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addressing, you may simply write (for example)
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@example
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mov.l bar,r0
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@end example
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@noindent
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where other assemblers might require an explicit displacement to
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@code{bar} from the program counter:
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@example
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mov.l @@(@var{disp}, PC)
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@end example
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@ifset SMALL
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@c this table, due to the multi-col faking and hardcoded order, looks silly
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@c except in smallbook. See comments below "@set SMALL" near top of this file.
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Here is a summary of SH opcodes:
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@page
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@smallexample
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@i{Legend:}
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Rn @r{a numbered register}
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Rm @r{another numbered register}
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#imm @r{immediate data}
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disp @r{displacement}
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disp8 @r{8-bit displacement}
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disp12 @r{12-bit displacement}
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add #imm,Rn lds.l @@Rn+,PR
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add Rm,Rn mac.w @@Rm+,@@Rn+
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addc Rm,Rn mov #imm,Rn
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addv Rm,Rn mov Rm,Rn
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and #imm,R0 mov.b Rm,@@(R0,Rn)
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and Rm,Rn mov.b Rm,@@-Rn
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and.b #imm,@@(R0,GBR) mov.b Rm,@@Rn
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bf disp8 mov.b @@(disp,Rm),R0
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bra disp12 mov.b @@(disp,GBR),R0
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bsr disp12 mov.b @@(R0,Rm),Rn
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bt disp8 mov.b @@Rm+,Rn
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clrmac mov.b @@Rm,Rn
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clrt mov.b R0,@@(disp,Rm)
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cmp/eq #imm,R0 mov.b R0,@@(disp,GBR)
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cmp/eq Rm,Rn mov.l Rm,@@(disp,Rn)
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cmp/ge Rm,Rn mov.l Rm,@@(R0,Rn)
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cmp/gt Rm,Rn mov.l Rm,@@-Rn
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cmp/hi Rm,Rn mov.l Rm,@@Rn
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cmp/hs Rm,Rn mov.l @@(disp,Rn),Rm
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cmp/pl Rn mov.l @@(disp,GBR),R0
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cmp/pz Rn mov.l @@(disp,PC),Rn
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cmp/str Rm,Rn mov.l @@(R0,Rm),Rn
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div0s Rm,Rn mov.l @@Rm+,Rn
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div0u mov.l @@Rm,Rn
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div1 Rm,Rn mov.l R0,@@(disp,GBR)
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exts.b Rm,Rn mov.w Rm,@@(R0,Rn)
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exts.w Rm,Rn mov.w Rm,@@-Rn
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extu.b Rm,Rn mov.w Rm,@@Rn
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extu.w Rm,Rn mov.w @@(disp,Rm),R0
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jmp @@Rn mov.w @@(disp,GBR),R0
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jsr @@Rn mov.w @@(disp,PC),Rn
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ldc Rn,GBR mov.w @@(R0,Rm),Rn
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ldc Rn,SR mov.w @@Rm+,Rn
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ldc Rn,VBR mov.w @@Rm,Rn
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ldc.l @@Rn+,GBR mov.w R0,@@(disp,Rm)
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ldc.l @@Rn+,SR mov.w R0,@@(disp,GBR)
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ldc.l @@Rn+,VBR mova @@(disp,PC),R0
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lds Rn,MACH movt Rn
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lds Rn,MACL muls Rm,Rn
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lds Rn,PR mulu Rm,Rn
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lds.l @@Rn+,MACH neg Rm,Rn
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lds.l @@Rn+,MACL negc Rm,Rn
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@page
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nop stc VBR,Rn
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not Rm,Rn stc.l GBR,@@-Rn
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or #imm,R0 stc.l SR,@@-Rn
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or Rm,Rn stc.l VBR,@@-Rn
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or.b #imm,@@(R0,GBR) sts MACH,Rn
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rotcl Rn sts MACL,Rn
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rotcr Rn sts PR,Rn
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rotl Rn sts.l MACH,@@-Rn
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rotr Rn sts.l MACL,@@-Rn
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rte sts.l PR,@@-Rn
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rts sub Rm,Rn
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sett subc Rm,Rn
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shal Rn subv Rm,Rn
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shar Rn swap.b Rm,Rn
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shll Rn swap.w Rm,Rn
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shll16 Rn tas.b @@Rn
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shll2 Rn trapa #imm
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shll8 Rn tst #imm,R0
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shlr Rn tst Rm,Rn
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shlr16 Rn tst.b #imm,@@(R0,GBR)
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shlr2 Rn xor #imm,R0
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shlr8 Rn xor Rm,Rn
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sleep xor.b #imm,@@(R0,GBR)
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stc GBR,Rn xtrct Rm,Rn
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stc SR,Rn
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@end smallexample
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@end ifset
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@ifset Renesas-all
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@ifclear GENERIC
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@raisesections
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@end ifclear
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@end ifset
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