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| author | Borislav Petkov <bp@suse.de> | 2020-11-28 14:20:06 +0100 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2020-11-29 09:08:56 -0800 |
| commit | 632ee6fd822f8264edc5935c4e31955849df8ba2 (patch) | |
| tree | cb5f6b5f3ea89bbab67eaf48ecb4b965832e5f8a /elfcpp | |
| parent | 568cbddc710f6cb6be752f390a1521cd5556ad9b (diff) | |
| download | gdb-632ee6fd822f8264edc5935c4e31955849df8ba2.zip gdb-632ee6fd822f8264edc5935c4e31955849df8ba2.tar.gz gdb-632ee6fd822f8264edc5935c4e31955849df8ba2.tar.bz2 | |
x86: Do not dump DS/CS segment overrides for branch hints
The previous change
"x86: Ignore CS/DS/ES/SS segment-override prefixes in 64-bit mode"
to ignore segment override prefixes in 64-bit mode lead to dumping
branch hints as excessive prefixes:
ffffffff8109d5a0 <vmx_get_rflags>:
...
ffffffff8109d601: 3e 77 0a ds ja,pt ffffffff8109d60e <vmx_get_rflags+0x6e>
^^^^^
In this particular case, those prefixes are not excessive but are used
to provide branch hints - taken/not-taken - to the CPU.
Assign active_seg_prefix in that particular case to consume them.
gas/
2002-11-29 Borislav Petkov <bp@suse.de>
* testsuite/gas/i386/branch.d: Add new branch insns test.
* testsuite/gas/i386/branch.s: Likewise.
* testsuite/gas/i386/i386.exp: Insert the new branch test.
* testsuite/gas/i386/x86-64-branch.d: Test for branch hints insns.
* testsuite/gas/i386/x86-64-branch.s: Likewise.
* testsuite/gas/i386/ilp32/x86-64-branch.d: Likewise.
opcodes/
2020-11-28 Borislav Petkov <bp@suse.de>
* i386-dis.c (print_insn): Set active_seg_prefix for branch hint insns
to not dump branch hint prefixes 0x2E and 0x3E as unused prefixes.
Diffstat (limited to 'elfcpp')
0 files changed, 0 insertions, 0 deletions