@c Copyright 1991, 1992, 1993, 1994, 1995, 1997, 1999, 2000, 2001,
-@c 2002, 2003, 2004
+@c 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
@c Free Software Foundation, Inc.
@c This is part of the GAS manual.
@c For copying conditions, see the file as.texinfo.
* MIPS option stack:: Directives to save and restore options
* MIPS ASE instruction generation overrides:: Directives to control
generation of MIPS ASE instructions
+* MIPS floating-point:: Directives to override floating-point options
@end menu
@node MIPS Opts
tools, which must be configured for one or the other). Use @samp{-EB}
to select big-endian output, and @samp{-EL} for little-endian.
+@item -KPIC
+@cindex PIC selection, MIPS
+@cindex @option{-KPIC} option, MIPS
+Generate SVR4-style PIC. This option tells the assembler to generate
+SVR4-style position-independent macro expansions. It also tells the
+assembler to mark the output file as PIC.
+
+@item -mvxworks-pic
+@cindex @option{-mvxworks-pic} option, MIPS
+Generate VxWorks PIC. This option tells the assembler to generate
+VxWorks-style position-independent macro expansions.
+
@cindex MIPS architecture options
@item -mips1
@itemx -mips2
@itemx -mips3
@itemx -mips4
-@itemx -mips5
+@itemx -mips5xo
@itemx -mips32
@itemx -mips32r2
@itemx -mips64
@item -mdsp
@itemx -mno-dsp
-Generate code for the DSP Application Specific Extension.
-This tells the assembler to accept DSP instructions.
+Generate code for the DSP Release 1 Application Specific Extension.
+This tells the assembler to accept DSP Release 1 instructions.
@samp{-mno-dsp} turns off this option.
+@item -mdspr2
+@itemx -mno-dspr2
+Generate code for the DSP Release 2 Application Specific Extension.
+This option implies -mdsp.
+This tells the assembler to accept DSP Release 2 instructions.
+@samp{-mno-dspr2} turns off this option.
+
@item -mmt
@itemx -mno-mt
Generate code for the MT Application Specific Extension.
Cause nops to be inserted if the read of the destination register
of an mfhi or mflo instruction occurs in the following two instructions.
+@item -mfix-loongson2f-jump
+@itemx -mno-fix-loongson2f-jump
+Eliminate instruction fetch from outside 256M region to work around the
+Loongson2F @samp{jump} instructions. Without it, under extreme cases,
+the kernel may crash. The issue has been solved in latest processor
+batches, but this fix has no side effect to them.
+
+@item -mfix-loongson2f-nop
+@itemx -mno-fix-loongson2f-nop
+Replace nops by @code{or at,at,zero} to work around the Loongson2F
+@samp{nop} errata. Without it, under extreme cases, cpu might
+deadlock. The issue has been solved in latest loongson2f batches, but
+this fix has no side effect to them.
+
@item -mfix-vr4120
-@itemx -no-mfix-vr4120
+@itemx -mno-fix-vr4120
Insert nops to work around certain VR4120 errata. This option is
intended to be used on GCC-generated code: it is not designed to catch
all problems in hand-written assembler code.
@item -mfix-vr4130
-@itemx -no-mfix-vr4130
+@itemx -mno-fix-vr4130
Insert nops to work around the VR4130 @samp{mflo}/@samp{mfhi} errata.
+@item -mfix-24k
+@itemx -no-mfix-24k
+Insert nops to work around the 24K @samp{eret}/@samp{deret} errata.
+
+@item -mfix-cn63xxp1
+@itemx -mno-fix-cn63xxp1
+Replace @code{pref} hints 0 - 4 and 6 - 24 with hint 28 to work around
+certain CN63XXP1 errata.
+
@item -m4010
@itemx -no-m4010
Generate code for the LSI @sc{r4010} chip. This tells the assembler to
rm9000,
10000,
12000,
+14000,
+16000,
4kc,
4km,
4kp,
m4k,
m4kp,
24kc,
+24kf2_1,
24kf,
-24kx,
+24kf1_1,
24kec,
+24kef2_1,
24kef,
-24kex,
+24kef1_1,
34kc,
+34kf2_1,
34kf,
-34kx,
+34kf1_1,
+74kc,
+74kf2_1,
+74kf,
+74kf1_1,
+74kf3_2,
+1004kc,
+1004kf2_1,
+1004kf,
+1004kf1_1,
5kc,
5kf,
20kc,
25kf,
-sb1
+sb1,
+sb1a,
+loongson2e,
+loongson2f,
+loongson3a,
+octeon,
+xlr
@end quotation
+For compatibility reasons, @samp{@var{n}x} and @samp{@var{b}fx} are
+accepted as synonyms for @samp{@var{n}f1_1}. These values are
+deprecated.
+
@item -mtune=@var{cpu}
Schedule and tune for a particular MIPS cpu. Valid @var{cpu} values are
identical to @samp{-march=@var{cpu}}.
@sc{gnu} @code{@value{AS}}, there is no need for @samp{-nocpp}, because the
@sc{gnu} assembler itself never runs the C preprocessor.
+@item -msoft-float
+@itemx -mhard-float
+Disable or enable floating-point instructions. Note that by default
+floating-point instructions are always allowed even with CPU targets
+that don't have support for these instructions.
+
+@item -msingle-float
+@itemx -mdouble-float
+Disable or enable double-precision floating-point operations. Note
+that by default double-precision floating-point operations are always
+allowed even with CPU targets that don't have support for these
+operations.
+
@item --construct-floats
@itemx --no-construct-floats
-@cindex --construct-floats
-@cindex --no-construct-floats
The @code{--no-construct-floats} option disables the construction of
double width floating point constants by loading the two halves of the
value into the two single width floating point registers that make up
@code{@value{AS}} automatically adds 1 to the value, so that jumping to
the loaded address will do the right thing.
+@kindex @code{.global}
+The @code{.global} and @code{.globl} directives supported by
+@code{@value{AS}} will by default mark the symbol as pointing to a
+region of data not code. This means that, for example, any
+instructions following such a symbol will not be disassembled by
+@code{objdump} as it will regard them as data. To change this
+behaviour an optional section name can be placed after the symbol name
+in the @code{.global} directive. If this section exists and is known
+to be a code section, then the symbol will be marked as poiting at
+code not data. Ie the syntax for the directive is:
+
+ @code{.global @var{symbol}[ @var{section}][, @var{symbol}[ @var{section}]] ...},
+
+Here is a short example:
+
+@example
+ .global foo .text, bar, baz .data
+foo:
+ nop
+bar:
+ .word 0x0
+baz:
+ .word 0x1
+
+@end example
+
@node MIPS option stack
@section Directives to save and restore options
in the assembly. The @code{.set nomdmx} directive prevents MDMX
instructions from being accepted.
-@cindex MIPS DSP instruction generation override
+@cindex MIPS DSP Release 1 instruction generation override
@kindex @code{.set dsp}
@kindex @code{.set nodsp}
The directive @code{.set dsp} makes the assembler accept instructions
-from the DSP Application Specific Extension from that point on
-in the assembly. The @code{.set nodsp} directive prevents DSP
-instructions from being accepted.
+from the DSP Release 1 Application Specific Extension from that point
+on in the assembly. The @code{.set nodsp} directive prevents DSP
+Release 1 instructions from being accepted.
+
+@cindex MIPS DSP Release 2 instruction generation override
+@kindex @code{.set dspr2}
+@kindex @code{.set nodspr2}
+The directive @code{.set dspr2} makes the assembler accept instructions
+from the DSP Release 2 Application Specific Extension from that point
+on in the assembly. This dirctive implies @code{.set dsp}. The
+@code{.set nodspr2} directive prevents DSP Release 2 instructions from
+being accepted.
@cindex MIPS MT instruction generation override
@kindex @code{.set mt}
instructions from being accepted.
Traditional @sc{mips} assemblers do not support these directives.
+
+@node MIPS floating-point
+@section Directives to override floating-point options
+
+@cindex Disable floating-point instructions
+@kindex @code{.set softfloat}
+@kindex @code{.set hardfloat}
+The directives @code{.set softfloat} and @code{.set hardfloat} provide
+finer control of disabling and enabling float-point instructions.
+These directives always override the default (that hard-float
+instructions are accepted) or the command-line options
+(@samp{-msoft-float} and @samp{-mhard-float}).
+
+@cindex Disable single-precision floating-point operations
+@kindex @code{.set singlefloat}
+@kindex @code{.set doublefloat}
+The directives @code{.set singlefloat} and @code{.set doublefloat}
+provide finer control of disabling and enabling double-precision
+float-point operations. These directives always override the default
+(that double-precision operations are accepted) or the command-line
+options (@samp{-msingle-float} and @samp{-mdouble-float}).
+
+Traditional @sc{mips} assemblers do not support these directives.
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