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* doc/c-arm.texi (ARM-Instruction-Set): New node. Documents the 

different syntaxes support by the ARM port.
        (ARM Directives): Add entry for .syntax.
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Nick Clifton 2009-07-30 08:54:49 +00:00
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@ -1,5 +1,9 @@
2009-07-30 Nick Clifton <nickc@redhat.com>
* doc/c-arm.texi (ARM-Instruction-Set): New node. Documents the
different syntaxes support by the ARM port.
(ARM Directives): Add entry for .syntax.
* doc/c-mips.texi (MIPS insn): Fix typo.
2009-07-29 Alan Modra <amodra@bigpond.net.au>

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gas/doc/c-arm.texi
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@ -323,11 +323,47 @@ features. The default is to warn.
@node ARM Syntax
@section Syntax
@menu
* ARM-Instruction-Set:: Instruction Set
* ARM-Chars:: Special Characters
* ARM-Regs:: Register Names
* ARM-Relocations:: Relocations
@end menu
@node ARM-Instruction-Set
@subsection Instruction Set Syntax
Two slightly different syntaxes are support for ARM and THUMB
instructions. The default, @code{divided}, uses the old style where
ARM and THUMB instructions had their own, separate syntaxes. The new,
@code{unified} syntax, which can be selected via the @code{.syntax}
directive, and has the following main features:
@table @bullet
@item
Immediate operands do not require a @code{#} prefix.
@item
The @code{IT} instruction may appear, and if it does it is validated
against subsequent conditional affixes. In ARM mode it does not
generate machine code, in THUMB mode it does.
@item
For ARM instructions the conditional affixes always appear at the end
of the instruction. For THUMB instructions conditional affixes can be
used, but only inside the scope of an @code{IT} instruction.
@item
All of the instructions new to the V6T2 architecture (and later) are
available. (Only a few such instructions can be written in the
@code{divided} syntax).
@item
The @code{.N} and @code{.W} suffixes are recognized and honored.
@item
All instructions set the flags if and only if they have an @code{s}
affix.
@end table
@node ARM-Chars
@subsection Special Characters
@ -722,6 +758,11 @@ This directive emits relocations that evaluate to the section-relative
offset of each expression's symbol. This directive is only supported
for PE targets.
@cindex @code{.syntax} directive, ARM
@item .syntax [@code{unified} | @code{divided}]
This directive sets the Instruction Set Syntax as described in the
@ref{ARM-Instruction-Set} section.
@c TTTTTTTTTTTTTTTTTTTTTTTTTT
@cindex @code{.thumb} directive, ARM