X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=urcu%2Farch_x86.h;fp=urcu%2Farch_x86.h;h=64cc026f9cd46343cb977dc7b076bf9a7d70a317;hp=c4674de0d35adfbe3eaa19560ba3a4750583fecb;hb=dac93f5961f305a3bd08cd82f649a7a4dcf6e3eb;hpb=e4d1eb09301904b56cdf22e1d6042df4492d57cb

diff --git a/urcu/arch_x86.h b/urcu/arch_x86.h
index c4674de..64cc026 100644
--- a/urcu/arch_x86.h
+++ b/urcu/arch_x86.h
@@ -49,9 +49,13 @@ extern "C" {
 
 /*
  * Serialize core instruction execution. Also acts as a compiler barrier.
- * Cannot use cpuid on PIC because it clobbers the ebx register;
- * error: PIC register 'ebx' clobbered in 'asm'
+ * On PIC ebx cannot be clobbered
  */
+#ifdef __PIC__
+#define sync_core()							  \
+	asm volatile("push %%ebx; cpuid; pop %%ebx"			  \
+		     : : : "memory", "eax", "ecx", "edx");
+#endif
 #ifndef __PIC__
 #define sync_core()							  \
 	asm volatile("cpuid" : : : "memory", "eax", "ebx", "ecx", "edx");