1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
--- a/tools/libxc/xc_cpuid_x86.c 2011-10-20 15:05:42.000000000 -0200
+++ b/tools/libxc/xc_cpuid_x86.c 2012-02-15 00:01:46.307514813 -0200
@@ -42,23 +42,23 @@
static void cpuid(const unsigned int *input, unsigned int *regs)
{
unsigned int count = (input[1] == XEN_CPUID_INPUT_UNUSED) ? 0 : input[1];
- asm (
#ifdef __i386__
+/* Use the stack to avoid reg constraint failures with some gcc flags */
+ asm (
"push %%ebx; push %%edx\n\t"
-#else
- "push %%rbx; push %%rdx\n\t"
-#endif
"cpuid\n\t"
"mov %%ebx,4(%4)\n\t"
"mov %%edx,12(%4)\n\t"
-#ifdef __i386__
"pop %%edx; pop %%ebx\n\t"
+ : "=a" (regs[0]), "=c" (regs[2])
+ : "0" (input[0]), "1" (count), "S" (regs)
+ : "memory" );
#else
- "pop %%rdx; pop %%rbx\n\t"
+ asm (
+ "cpuid"
+ : "=a" (regs[0]), "=b" (regs[1]), "=c" (regs[2]), "=d" (regs[3])
+ : "0" (input[0]), "2" (count) );
#endif
- : "=a" (regs[0]), "=c" (regs[2])
- : "0" (input[0]), "1" (count), "S" (regs)
- : "memory" );
}
|
