mirrors/0ad
1
0
Fork 2
mirror of https://gitea.wildfiregames.com/0ad/0ad.git synced 2026-06-30 04:26:56 +00:00
Code Issues Packages Projects Releases Wiki Activity

Save PIC register in cpuid() to fix "can't find a register in class 'BREG'" error in some versions of GCC

Browse Source 
This was SVN commit r9023.
This commit is contained in:
Ykkrosh
2011-03-05 13:53:02 +00:00
parent 18798c3f8d
commit 712a92caa1
1 changed files with 18 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
source/lib/sysdep/arch/x86_x64/x86_x64.cpp
+18 -1
View File
@@ -79,7 +79,24 @@ static void cpuid(x86_x64_CpuidRegs* regs)
cassert(sizeof(*regs) == 4*sizeof(int));
__cpuidex((int*)regs, regs->eax, regs->ecx);
#elif GCC_VERSION
__asm__ __volatile__ ("cpuid": "=a" (regs->eax), "=b" (regs->ebx), "=c" (regs->ecx), "=d" (regs->edx) : "a" (regs->eax), "c" (regs->ecx));
// Need to preserve the PIC register (ebx/rbx) in case GCC is using it
# if ARCH_AMD64
__asm__ __volatile__ (
"pushq %%rbx\n"
"cpuid\n"
"movl %%ebx, %1\n"
"popq %%rbx\n"
: "=a" (regs->eax), "=m" (regs->ebx), "=c" (regs->ecx), "=d" (regs->edx)
: "a" (regs->eax), "c" (regs->ecx));
# else
__asm__ __volatile__ (
"pushl %%ebx\n"
"cpuid\n"
"movl %%ebx, %1\n"
"popl %%ebx\n"
: "=a" (regs->eax), "=m" (regs->ebx), "=c" (regs->ecx), "=d" (regs->edx)
: "a" (regs->eax), "c" (regs->ecx));
# endif
#else
# if ARCH_AMD64
amd64_asm_cpuid(regs);