uatomic: add uatomic_or

[urcu.git] / compat_arch_x86.c

diff --git a/compat_arch_x86.c b/compat_arch_x86.c
index 5342c7be58842617da03ee3da930bfaea83e6947..33bf13df41b7bcae348e3d4e6dcb3661d97b64d5 100644 (file)
--- a/compat_arch_x86.c
+++ b/compat_arch_x86.c
@@ -201,6 +201,31 @@ unsigned long _compat_uatomic_cmpxchg(void *addr, unsigned long old,
        return retval;
 }
 
+void _compat_uatomic_or(void *addr, unsigned long v, int len)
+{
+       sigset_t mask;
+
+       mutex_lock_signal_save(&compat_mutex, &mask);
+       switch (len) {
+       case 1:
+               *(unsigned char *)addr |= (unsigned char)v;
+               break;
+       case 2:
+               *(unsigned short *)addr |= (unsigned short)v;
+               break;
+       case 4:
+               *(unsigned int *)addr |= (unsigned int)v;
+               break;
+       default:
+               /*
+                * generate an illegal instruction. Cannot catch this with
+                * linker tricks when optimizations are disabled.
+                */
+               __asm__ __volatile__("ud2");
+       }
+       mutex_lock_signal_restore(&compat_mutex, &mask);
+}
+
 unsigned long _compat_uatomic_add_return(void *addr, unsigned long v, int len)
 {
        sigset_t mask;