* config/tc-mips.c (mips_set_options): Add ase_mt for MT instructions.

(mips_opts): Add -1 to initialize ase_mt.
(file_ase_mt): New variable for -mmt.
(CPU_HAS_MT): New define.
(validate_mips_insn): Add supports for +t, +T, !, $, *, &, g operand
formats.
(mips_ip): Check ase_mt to enable MT instructions.
Handle !, $, *, &, +T, +t, g operand formats.
For "mftc1", "mfthc1", "cftc1", "mttc1", "mtthc1", "cttc1", we allow
odd float registers.
(OPTION_MT, OPTION_NO_MT): New define.
(OPTION_COMPAT_ARCH_BASE): Change because of inserting MT define.
(md_parse_option): Parse OPTION_MT and OPTION_NO_MT.
(mips_after_parse_args): Set ase_mt based on CPU.
(s_mipsset): Handle ".set mt" and ".set nomt".
(mips_elf_final_processing): Remind of adding new flag for MT ASE.
(md_show_usage): Show usage of -mmt and -mno-mt.
* doc/as.texinfo: Document -mmt and -mno-mt options.
* doc/c-mips.texi: Likewise, and document ".set mt" and ".set nomt"
directives.

2 files changed, 21 insertions, 0 deletions

diff --git a/gas/doc/as.texinfo b/gas/doc/as.texinfo
index a68a35c..0721631 100644
--- a/gas/doc/as.texinfo
+++ b/gas/doc/as.texinfo
@@ -368,6 +368,7 @@ gcc(1), ld(1), and the Info entries for @file{binutils} and @file{ld}.
    [@b{-mips16}] [@b{-no-mips16}]
    [@b{-mips3d}] [@b{-no-mips3d}]
    [@b{-mdmx}] [@b{-no-mdmx}]
+   [@b{-mmt}] [@b{-mno-mt}]
    [@b{-mdebug}] [@b{-no-mdebug}]
    [@b{-mpdr}] [@b{-mno-pdr}]
 @end ifset
@@ -1000,6 +1001,12 @@ Generate code for the MDMX Application Specific Extension.
 This tells the assembler to accept MDMX instructions.
 @samp{-no-mdmx} turns off this option.
 
+@item -mmt
+@itemx -mno-mt
+Generate code for the MT Application Specific Extension.
+This tells the assembler to accept MT instructions.
+@samp{-mno-mt} turns off this option.
+
 @item --construct-floats
 @itemx --no-construct-floats
 The @samp{--no-construct-floats} option disables the construction of
diff --git a/gas/doc/c-mips.texi b/gas/doc/c-mips.texi
index 97469fe..40be0fb 100644
--- a/gas/doc/c-mips.texi
+++ b/gas/doc/c-mips.texi
@@ -118,6 +118,12 @@ Generate code for the MDMX Application Specific Extension.
 This tells the assembler to accept MDMX instructions.
 @samp{-no-mdmx} turns off this option.
 
+@item -mmt
+@itemx -mno-mt
+Generate code for the MT Application Specific Extension.
+This tells the assembler to accept MT instructions.
+@samp{-mno-mt} turns off this option.
+
 @item -mfix7000
 @itemx -mno-fix7000
 Cause nops to be inserted if the read of the destination register
@@ -451,4 +457,12 @@ from the MDMX Application Specific Extension from that point on
 in the assembly.  The @code{.set nomdmx} directive prevents MDMX
 instructions from being accepted.
 
+@cindex MIPS MT instruction generation override
+@kindex @code{.set mt}
+@kindex @code{.set nomt}
+The directive @code{.set mt} makes the assembler accept instructions
+from the MT Application Specific Extension from that point on
+in the assembly.  The @code{.set nomt} directive prevents MT
+instructions from being accepted.
+
 Traditional @sc{mips} assemblers do not support these directives.