[MIPS/GAS] Add Loongson EXT2 Instructions support.

bfd/
	* elfxx-mips.c (print_mips_ases): Add Loongson EXT2 extension.

binutils/
	* readelf.c (print_mips_ases): Add Loongson EXT2 extension.

gas/
	* NEWS: Mention Loongson EXTensions R2 (EXT2) support.
	* config/tc-mips.c (options): Add OPTION_LOONGSON_EXT2 and
	OPTION_NO_LOONGSON_EXT2.
	(md_longopts): Likewise.
	(mips_ases): Define availability for EXT.
	(mips_convert_ase_flags): Map ASE_LOONGSON_EXT2 to
	AFL_ASE_LOONGSON_EXT2.
	(md_show_usage): Add help for -mloongson-ext2 and
	-mno-loongson-ext2.
	* doc/as.texi: Document -mloongson-ext2, -mno-loongson-ext2.
	* doc/c-mips.texi: Document -mloongson-ext2, -mno-loongson-ext2,
	.set loongson-ext2 and .set noloongson-ext2.
	* testsuite/gas/mips/loongson-ext2.d: New test.
	* testsuite/gas/mips/loongson-ext2.s: New test.
	* testsuite/gas/mips/mips.exp: Run loongson-ext2 test.

include/
	* elf/mips.h (AFL_ASE_LOONGSON_EXT2): New macro.
	(AFL_ASE_MASK): Update to include AFL_ASE_LOONGSON_EXT2.
	* opcode/mips.h (ASE_LOONGSON_EXT2): New macro.

opcodes/
	* mips-dis.c (parse_mips_ase_option): Handle -M loongson-ext
	option.
	(print_mips_disassembler_options): Document -M loongson-ext.
	* mips-opc.c (LEXT2): New macro.
	(mips_opcodes): Add cto, ctz, dcto, dctz instructions.

2 files changed, 24 insertions, 0 deletions

diff --git a/gas/doc/as.texi b/gas/doc/as.texi
index 92dd366..f3285b6 100644
--- a/gas/doc/as.texi
+++ b/gas/doc/as.texi
@@ -447,6 +447,7 @@ gcc(1), ld(1), and the Info entries for @file{binutils} and @file{ld}.
    [@b{-mloongson-mmi}] [@b{-mno-loongson-mmi}]
    [@b{-mloongson-cam}] [@b{-mno-loongson-cam}]
    [@b{-mloongson-ext}] [@b{-mno-loongson-ext}]
+   [@b{-mloongson-ext2}] [@b{-mno-loongson-ext2}]
    [@b{-minsn32}] [@b{-mno-insn32}]
    [@b{-mfix7000}] [@b{-mno-fix7000}]
    [@b{-mfix-rm7000}] [@b{-mno-fix-rm7000}]
@@ -1587,6 +1588,13 @@ Generate code for the Loongson EXTensions (EXT) instructions.
 This tells the assembler to accept Loongson EXT instructions.
 @samp{-mno-loongson-ext} turns off this option.
 
+@item -mloongson-ext2
+@itemx -mno-loongson-ext2
+Generate code for the Loongson EXTensions R2 (EXT2) instructions.
+This option implies @samp{-mloongson-ext}.
+This tells the assembler to accept Loongson EXT2 instructions.
+@samp{-mno-loongson-ext2} turns off this option.
+
 @item -minsn32
 @itemx -mno-insn32
 Only use 32-bit instruction encodings when generating code for the
diff --git a/gas/doc/c-mips.texi b/gas/doc/c-mips.texi
index 80b4160..f74e10f 100644
--- a/gas/doc/c-mips.texi
+++ b/gas/doc/c-mips.texi
@@ -267,6 +267,13 @@ Application Specific Extension.  This tells the assembler to accept EXT
 instructions.
 @samp{-mno-loongson-ext} turns off this option.
 
+@item -mloongson-ext2
+@itemx -mno-loongson-ext2
+Generate code for the Loongson EXTensions R2 (EXT2) instructions
+Application Specific Extension.  This tells the assembler to accept EXT2
+instructions.
+@samp{-mno-loongson-ext2} turns off this option.
+
 @item -minsn32
 @itemx -mno-insn32
 Only use 32-bit instruction encodings when generating code for the
@@ -1182,6 +1189,15 @@ instructions from the Loongson EXT from that point on in the assembly.
 The @code{.set noloongson-ext} directive prevents Loongson EXT instructions
 from being accepted.
 
+@cindex Loongson EXTensions R2 (EXT2) instructions generation override
+@kindex @code{.set loongson-ext2}
+@kindex @code{.set noloongson-ext2}
+The directive @code{.set loongson-ext2} makes the assembler accept
+instructions from the Loongson EXT2 from that point on in the assembly.
+This directive implies @code{.set loognson-ext}.
+The @code{.set noloongson-ext2} directive prevents Loongson EXT2 instructions
+from being accepted.
+
 Traditional MIPS assemblers do not support these directives.
 
 @node MIPS Floating-Point