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ntdll/tests: Do not write to fs, gs when testing cleared segment regs on x64. 

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51152
Signed-off-by: Paul Gofman <pgofman@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Paul Gofman 2021-06-23 19:37:33 +03:00 committed by Alexandre Julliard
parent 7722915395
commit 4e4847dd71
1 changed files with 17 additions and 0 deletions
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17
dlls/ntdll/tests/exception.c
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@ -2906,13 +2906,30 @@ static const struct exception
0x31, 0xc0, /* xor %eax,%eax */
0x8e, 0xc0, /* mov %eax,%es */
0x8e, 0xd8, /* mov %eax,%ds */
#if 0
/* It is observed that fs/gs base is reset
on some CPUs when setting the segment value
even to 0 (regardless of CPU spec
saying otherwise) and it is not currently
handled in Wine.
Disable this part to avoid crashing the test. */
0x8e, 0xe0, /* mov %eax,%fs */
0x8e, 0xe8, /* mov %eax,%gs */
#else
0x90, 0x90, /* nop */
0x90, 0x90, /* nop */
#endif
0xfa, /* cli */
0x58, /* pop %rax */
#if 0
0x8e, 0xe8, /* mov %eax,%gs */
0x58, /* pop %rax */
0x8e, 0xe0, /* mov %eax,%fs */
#else
0x58, /* pop %rax */
0x90, 0x90, /* nop */
0x90, 0x90, /* nop */
#endif
0x58, /* pop %rax */
0x8e, 0xd8, /* mov %eax,%ds */
0x58, /* pop %rax */