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| author | Borislav Petkov <bp@suse.de> | 2020-11-14 06:16:26 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2020-11-14 06:20:33 -0800 |
| commit | 0fa0fc8539f4451bd1ed76867ba87a335e28ff31 (patch) | |
| tree | c010ef4ef967a84d7726f9d1b7f6231350e1e22c /opcodes/ChangeLog | |
| parent | e8b2f0d952184fac8a230db181a4b9810729cd7b (diff) | |
| download | binutils-0fa0fc8539f4451bd1ed76867ba87a335e28ff31.zip binutils-0fa0fc8539f4451bd1ed76867ba87a335e28ff31.tar.gz binutils-0fa0fc8539f4451bd1ed76867ba87a335e28ff31.tar.bz2 | |
x86: Ignore CS/DS/ES/SS segment-override prefixes in 64-bit mode
"In 64-bit mode, the CS, DS, ES, and SS segment-override prefixes have
no effect. These four prefixes are not treated as segment-override
prefixes for the purposes of multiple-prefix rules. Instead, they are
treated as null prefixes." (AMD APM v2).
However, objdump disassembles instructions containing those ignored
prefixes by still generating that segment override:
66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
00 00 00 00
Print those segment override prefixes as excessive ones:
66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1)
00 00 00 00
which is what they actually are - they have no effect and the decoding
hardware ignores them.
gas/
2020-11-14 Borislav Petkov <bp@suse.de>
* testsuite/gas/i386/x86-64-segovr.d: Adjust regexes.
* testsuite/gas/i386/x86-64-nops.d: Likewise.
* testsuite/gas/i386/x86-64-nops-1.d: Likewise.
* testsuite/gas/i386/x86-64-nops-1-g64.d: Likewise.
* testsuite/gas/i386/x86-64-nops-1-core2.d: Likewise.
* testsuite/gas/i386/x86-64-nops-1-k8.d: Likewise.
* testsuite/gas/i386/x86-64-nops-2.d: Likewise.
* testsuite/gas/i386/x86-64-nops-3.d: Likewise.
* testsuite/gas/i386/x86-64-nops-4.d: Likewise.
* testsuite/gas/i386/x86-64-nops-4-core2.d: Likewise.
* testsuite/gas/i386/x86-64-nops-4-k8.d: Likewise.
* testsuite/gas/i386/x86-64-nops-5.d: Likewise.
* testsuite/gas/i386/x86-64-nops-5-k8.d: Likewise.
* testsuite/gas/i386/x86-64-nops-7.d: Likewise.
* testsuite/gas/i386/x86-64-nop-1.d: Likewise.
* testsuite/gas/i386/x86-64-align-branch-1a.d: Likewise.
* testsuite/gas/i386/x86-64-align-branch-1b.d: Likewise.
* testsuite/gas/i386/x86-64-align-branch-1c.d: Likewise.
* testsuite/gas/i386/x86-64-align-branch-1d.d: Likewise.
* testsuite/gas/i386/x86-64-align-branch-1g.d: Likewise.
* testsuite/gas/i386/x86-64-align-branch-2c.d: Likewise.
* testsuite/gas/i386/x86-64-align-branch-6.d: Likewise.
* testsuite/gas/i386/x86-64-align-branch-7.d: Likewise.
* testsuite/gas/i386/x86-64-align-branch-8.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-nops-1-core2.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-nops-1-k8.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-nops-1.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-nops-2.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-nops-3.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-nops-4-core2.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-nops-4-k8.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-nops-4.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-nops-5-k8.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-nops-5.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-nops.d:: Likewise.
ld/
2020-11-14 Borislav Petkov <bp@suse.de>
* testsuite/ld-x86-64/pe-x86-64-4.od: Adjust regexes.
* testsuite/ld-x86-64/tlsld3.dd: Likewise.
* testsuite/ld-x86-64/tlsld4.dd: Likewise.
opcodes/
2020-11-14 Borislav Petkov <bp@suse.de>
* i386-dis.c (ckprefix): Do not assign active_seg_prefix in
64-bit addressing mode.
(NOTRACK_Fixup): Test prefixes for PREFIX_DS, instead of
active_seg_prefix.
Diffstat (limited to 'opcodes/ChangeLog')
| -rw-r--r-- | opcodes/ChangeLog | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog index d00e549..b25132a 100644 --- a/opcodes/ChangeLog +++ b/opcodes/ChangeLog @@ -1,3 +1,10 @@ +2020-11-14 Borislav Petkov <bp@suse.de> + + * i386-dis.c (ckprefix): Do not assign active_seg_prefix in + 64-bit addressing mode. + (NOTRACK_Fixup): Test prefixes for PREFIX_DS, instead of + active_seg_prefix. + 2020-11-11 Przemyslaw Wirkus <przemyslaw.wirkus@arm.com> * aarch64-tbl.h: Enable -march=armv8.6-a+ls64. |