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| author | Jan Beulich <jbeulich@novell.com> | 2012-08-07 16:57:49 +0000 |
|---|---|---|
| committer | Jan Beulich <jbeulich@novell.com> | 2012-08-07 16:57:49 +0000 |
| commit | 848930b2ba6024409e18d93f52fbdc206c4904c4 (patch) | |
| tree | c97c7f6e0a9b58fb1cb7ea8a88c783c5022184d2 /gas/config | |
| parent | 7bab8ab56f7c09acbaca2645314e0622b20c2afe (diff) | |
| download | gdb-848930b2ba6024409e18d93f52fbdc206c4904c4.zip gdb-848930b2ba6024409e18d93f52fbdc206c4904c4.tar.gz gdb-848930b2ba6024409e18d93f52fbdc206c4904c4.tar.bz2 | |
Despite them being ignored by the CPU, gas issues segment override
prefixes for other than FS/GS in 64-bit mode. If doing so at all, it
should clearly do this correctly. Determining the default segment,
however, requires to take into consideration RegRex (so far, RSP, RBP,
R12, and R13 were all treated equally here).
gas/
2012-08-07 Jan Beulich <jbeulich@suse.com>
* config/tc-i386-intel.c (build_modrm_byte): Split determining
default segment from figuring out encoding. Honor RegRex for
the former.
gas/testsuite/
2012-08-07 Jan Beulich <jbeulich@suse.com>
* gas/i386/x86-64-segovr.{s,l}: New.
* gas/i386/i386.exp: Run new test.
Diffstat (limited to 'gas/config')
| -rw-r--r-- | gas/config/tc-i386.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index 7cc6fa7..171749e 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -5770,18 +5770,14 @@ build_modrm_byte (void) i.sib.base = i.base_reg->reg_num; /* x86-64 ignores REX prefix bit here to avoid decoder complications. */ - if ((i.base_reg->reg_num & 7) == EBP_REG_NUM) - { + if (!(i.base_reg->reg_flags & RegRex) + && (i.base_reg->reg_num == EBP_REG_NUM + || i.base_reg->reg_num == ESP_REG_NUM)) default_seg = &ss; - if (i.disp_operands == 0) - { - fake_zero_displacement = 1; - i.types[op].bitfield.disp8 = 1; - } - } - else if (i.base_reg->reg_num == ESP_REG_NUM) + if (i.base_reg->reg_num == 5 && i.disp_operands == 0) { - default_seg = &ss; + fake_zero_displacement = 1; + i.types[op].bitfield.disp8 = 1; } i.sib.scale = i.log2_scale_factor; if (i.index_reg == 0) |