aperf: fix compilation on x86-32 with -fPIC
ebx is used to store the GOT pointer when compiled with -fPIC, so it's
not usable by inline assembly.
https://bugs.gentoo.org/375967
Signed-off-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
diff --git a/utils/cpuid.h b/utils/cpuid.h
index 2bac69a..53da789 100644
--- a/utils/cpuid.h
+++ b/utils/cpuid.h
@@ -5,9 +5,21 @@
unsigned int *ecx, unsigned int *edx)
{
/* ecx is often an input as well as an output. */
- asm volatile("cpuid"
+ asm volatile(
+#if defined(__i386__) && defined(__PIC__)
+ "push %%ebx\n"
+ "cpuid\n"
+ "movl %%ebx, %1\n"
+ "pop %%ebx\n"
+#else
+ "cpuid\n"
+#endif
: "=a" (*eax),
+#if defined(__i386__) && defined(__PIC__)
+ "=r" (*ebx),
+#else
"=b" (*ebx),
+#endif
"=c" (*ecx),
"=d" (*edx)
: "0" (*eax), "2" (*ecx));
