diff options
Diffstat (limited to 'gas/config/tc-i386.c')
| -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)) \ |