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Make the code work with

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-fomit-frame-pointer by making sure that %esp isn't modified at the point where we access output operands. (#4269, Patch from Ronald Wahl)
This commit is contained in:
Owen Taylor 2005-08-27 18:36:09 +00:00
parent 03c3935471
commit c0da73e1b8
2 changed files with 24 additions and 7 deletions
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7
pixman/ChangeLog
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@ -1,3 +1,10 @@
2005-08-27 Owen Taylor <otaylor@redhat.com>
* src/fbmmx.c (detectCPUFeatures): Make the code work with
-fomit-frame-pointer by making sure that %esp isn't modified at
the point where we access output operands. (#4269, Patch from
Ronald Wahl)
2005-08-22 Owen Taylor <otaylor@redhat.com>
* src/pixregion.c (pixman_region_union_rect): When width/height

24
pixman/src/fbmmx.c
View file

@ -2488,28 +2488,38 @@ static unsigned int detectCPUFeatures(void) {
vendor[0] = 0;
vendor[12] = 0;
/* see p. 118 of amd64 instruction set manual Vol3 */
__asm__ ("push %%ebx\n"
"pushf\n"
/* We need to be careful about the handling of %ebx and
* %esp here. We can't declare either one as clobbered
* since they are special registers (%ebx is the "PIC
* register" holding an offset to global data, %esp the
* stack pointer), so we need to make sure they have their
* original values when we access the output operands.
*/
__asm__ ("pushf\n"
"pop %%eax\n"
"mov %%eax, %%ebx\n"
"mov %%eax, %%ecx\n"
"xor $0x00200000, %%eax\n"
"push %%eax\n"
"popf\n"
"pushf\n"
"pop %%eax\n"
"mov $0x0, %%edx\n"
"xor %%ebx, %%eax\n"
"xor %%ecx, %%eax\n"
"jz skip\n"
"mov $0x00000000, %%eax\n"
"push %%ebx\n"
"cpuid\n"
"mov %%ebx, %1\n"
"mov %%ebx, %%eax\n"
"pop %%ebx\n"
"mov %%eax, %1\n"
"mov %%edx, %2\n"
"mov %%ecx, %3\n"
"mov $0x00000001, %%eax\n"
"push %%ebx\n"
"cpuid\n"
"pop %%ebx\n"
"skip:\n"
"pop %%ebx\n"
"mov %%edx, %0\n"
: "=r" (result),
"=m" (vendor[0]),
@ -2543,8 +2553,8 @@ static unsigned int detectCPUFeatures(void) {
"mov $0x80000001, %%eax\n"
"cpuid\n"
"skip2:\n"
"mov %%edx, %0\n"
"pop %%ebx\n"
"mov %%edx, %0\n"
: "=r" (result)
:
: "%eax", "%ecx", "%edx"