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| author | Ilya Tocar <ilya.tocar@intel.com> | 2014-08-01 17:58:32 +0400 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2014-08-06 08:32:01 -0700 |
| commit | d022bddd4fd93428a7fa3cc7ad404c912ed20dbf (patch) | |
| tree | 03fca1a622763ceb73b02e5c514be06f46f20681 /gas/config | |
| parent | ad9fe6c108abf73f47219655ff19a5ec68b68124 (diff) | |
| download | gdb-d022bddd4fd93428a7fa3cc7ad404c912ed20dbf.zip gdb-d022bddd4fd93428a7fa3cc7ad404c912ed20dbf.tar.gz gdb-d022bddd4fd93428a7fa3cc7ad404c912ed20dbf.tar.bz2 | |
Add -momit_lock_prefix=[no|yes] option
This option serves as a workaround for processors, which fail on lock
prefix.
gas/
* config/tc-i386.c (omit_lock_prefix): New.
(output_insn): Omit lock prefix if omit_lock_prefix is true.
(OPTION_omit_lock_prefix): New.
(md_longopts): Add momit-lock-prefix.
(md_parse_option): Handle momit-lock-prefix.
(md_show_usage): Add momit-lock-prefix=[no|yes].
* doc/c-i386.texi (momit-lock-prefix): Document.
gas/testsuite/
* gas/i386/i386.exp: Run new tests.
* gas/i386/omit-lock-no.d: New.
* gas/i386/omit-lock-yes.d: Ditto.
* gas/i386/omit-lock.s: Ditto.
Diffstat (limited to 'gas/config')
| -rw-r--r-- | gas/config/tc-i386.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index c61d22b..ab5a319 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -543,6 +543,10 @@ static int add_bnd_prefix = 0; /* 1 if pseudo index register, eiz/riz, is allowed . */ static int allow_index_reg = 0; +/* 1 if the assembler should ignore LOCK prefix, even if it was + specified explicitly. */ +static int omit_lock_prefix = 0; + static enum check_kind { check_none = 0, @@ -6938,6 +6942,15 @@ output_insn (void) unsigned int j; unsigned int prefix; + /* Some processors fail on LOCK prefix. This options makes + assembler ignore LOCK prefix and serves as a workaround. */ + if (omit_lock_prefix) + { + if (i.tm.base_opcode == LOCK_PREFIX_OPCODE) + return; + i.prefix[LOCK_PREFIX] = 0; + } + /* Since the VEX/EVEX prefix contains the implicit prefix, we don't need the explicit prefix. */ if (!i.tm.opcode_modifier.vex && !i.tm.opcode_modifier.evex) @@ -9532,6 +9545,7 @@ const char *md_shortopts = "qn"; #define OPTION_MEVEXLIG (OPTION_MD_BASE + 16) #define OPTION_MEVEXWIG (OPTION_MD_BASE + 17) #define OPTION_MBIG_OBJ (OPTION_MD_BASE + 18) +#define OPTION_omit_lock_prefix (OPTION_MD_BASE + 19) struct option md_longopts[] = { @@ -9561,6 +9575,7 @@ struct option md_longopts[] = # if defined (TE_PE) || defined (TE_PEP) {"mbig-obj", no_argument, NULL, OPTION_MBIG_OBJ}, #endif + {"momit-lock-prefix", required_argument, NULL, OPTION_omit_lock_prefix}, {NULL, no_argument, NULL, 0} }; size_t md_longopts_size = sizeof (md_longopts); @@ -9848,6 +9863,15 @@ md_parse_option (int c, char *arg) break; #endif + case OPTION_omit_lock_prefix: + if (strcasecmp (arg, "yes") == 0) + omit_lock_prefix = 1; + else if (strcasecmp (arg, "no") == 0) + omit_lock_prefix = 0; + else + as_fatal (_("invalid -momit-lock-prefix= option: `%s'"), arg); + break; + default: return 0; } @@ -10004,6 +10028,9 @@ md_show_usage (FILE *stream) fprintf (stream, _("\ -mbig-obj generate big object files\n")); #endif + fprintf (stream, _("\ + -momit-lock-prefix=[no|yes]\n\ + strip all lock prefixes\n")); } #if ((defined (OBJ_MAYBE_COFF) && defined (OBJ_MAYBE_AOUT)) \ |