genode/repos/dde_rump/patches/lock.patch

24 lines
784 B
Diff
Raw Normal View History

diff --git a/sys/arch/arm/include/lock.h b/sys/arch/arm/include/lock.h
index ba612d5..8e0e2f3 100644
--- a/src/sys/arch/arm/include/lock.h
+++ b/src/sys/arch/arm/include/lock.h
@@ -105,8 +105,18 @@ static __inline unsigned char
__swp(unsigned char __val, __cpu_simple_lock_t *__ptr)
{
uint32_t __val32;
+#ifdef _ARM_ARCH_6
__asm volatile("swpb %0, %1, [%2]"
: "=&r" (__val32) : "r" (__val), "r" (__ptr) : "memory");
+#else
+ __asm volatile(" 1: \n"
+ " ldrexb %0, [%2] \n"
+ " strexb r0, %1, [%2]\n"
+ " teqeq r0, #0 \n"
+ " bne 1b \n"
+ : "=&r" (__val32) : "r" (__val), "r" (__ptr)
+ : "memory", "r0");
+#endif
return __val32;
}
#else