diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2017-05-22 11:02:46 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-05-22 11:02:58 -0700 |
| commit | 04ef582ace91cad765d056cc95624478e0421144 (patch) | |
| tree | ce513249defa49cae554a37f0f532d696a6e788a /include | |
| parent | 25f94347373b1b6f4bfc79eeb38e79d383195779 (diff) | |
x86: Add NOTRACK prefix support
For register indirect branches, NOTRACK prefix (0x3e), which is also
the DS segment register prefix, can be used to ignore the CET indirect
branch track.
gas/
* config/tc-i386.c (REX_PREFIX): Changed to 7.
(NOTRACK_PREFIX): New.
(MAX_PREFIXES): Changed to 8.
(_i386_insn): Add notrack_prefix.
(PREFIX_GROUP): Add PREFIX_DS.
(add_prefix): Return PREFIX_DS for DS_PREFIX_OPCODE.
(md_assemble): Check if NOTRACK prefix is supported.
(parse_insn): Set notrack_prefix and issue an error for
other prefixes after NOTRACK prefix.
* testsuite/gas/i386/i386.exp: Run tests for NOTRACK prefix.
* testsuite/gas/i386/notrack-intel.d: New file.
* testsuite/gas/i386/notrack.d: Likewise.
* testsuite/gas/i386/notrack.s: Likewise.
* testsuite/gas/i386/notrackbad.l: Likewise.
* testsuite/gas/i386/notrackbad.s: Likewise.
* testsuite/gas/i386/x86-64-notrack-intel.d: Likewise.
* testsuite/gas/i386/x86-64-notrack.d: Likewise.
* testsuite/gas/i386/x86-64-notrack.s: Likewise.
* testsuite/gas/i386/x86-64-notrackbad.l: Likewise.
* testsuite/gas/i386/x86-64-notrackbad.s: Likewise.
include/
* include/opcode/i386.h (NOTRACK_PREFIX_OPCODE): New.
opcodes/
* i386-dis.c (NOTRACK_Fixup): New.
(NOTRACK): Likewise.
(NOTRACK_PREFIX): Likewise.
(last_active_prefix): Likewise.
(reg_table): Use NOTRACK on indirect call and jmp.
(ckprefix): Set last_active_prefix.
(prefix_name): Return "notrack" for NOTRACK_PREFIX.
* i386-gen.c (opcode_modifiers): Add NoTrackPrefixOk.
* i386-opc.h (NoTrackPrefixOk): New.
(i386_opcode_modifier): Add notrackprefixok.
* i386-opc.tbl: Add NoTrackPrefixOk to indirect call and jmp.
Add notrack.
* i386-tbl.h: Regenerated.
Diffstat (limited to 'include')
| -rw-r--r-- | include/ChangeLog | 4 | ||||
| -rw-r--r-- | include/opcode/i386.h | 1 |
2 files changed, 5 insertions, 0 deletions
diff --git a/include/ChangeLog b/include/ChangeLog index 6ed8fcc385..05e13ab852 100644 --- a/include/ChangeLog +++ b/include/ChangeLog @@ -1,3 +1,7 @@ +2017-05-22 H.J. Lu <hongjiu.lu@intel.com> + + * include/opcode/i386.h (NOTRACK_PREFIX_OPCODE): New. + 2017-05-19 Jose E. Marchesi <jose.marchesi@oracle.com> * elf/sparc.h (ELF_SPARC_HWCAP2_SPARC6): Define. diff --git a/include/opcode/i386.h b/include/opcode/i386.h index 58cbf06d4b..8d271bef94 100644 --- a/include/opcode/i386.h +++ b/include/opcode/i386.h @@ -77,6 +77,7 @@ #define XACQUIRE_PREFIX_OPCODE 0xf2 #define XRELEASE_PREFIX_OPCODE 0xf3 #define BND_PREFIX_OPCODE 0xf2 +#define NOTRACK_PREFIX_OPCODE 0x3e #define TWO_BYTE_OPCODE_ESCAPE 0x0f #define NOP_OPCODE (char) 0x90 |