Use libgcc __clear_cache to clean icache, when available.
Calling the clear cache syscall directly generates an illegal instruction
on some (armv4) kernels.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5843 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/exec-all.h b/exec-all.h
index ca97f57..7f963b0 100644
--- a/exec-all.h
+++ b/exec-all.h
@@ -205,18 +205,26 @@
#elif defined(__arm__)
static inline void tb_set_jmp_target1(unsigned long jmp_addr, unsigned long addr)
{
+#if QEMU_GNUC_PREREQ(4, 1)
+ void __clear_cache(char *beg, char *end);
+#else
register unsigned long _beg __asm ("a1");
register unsigned long _end __asm ("a2");
register unsigned long _flg __asm ("a3");
+#endif
/* we could use a ldr pc, [pc, #-4] kind of branch and avoid the flush */
*(uint32_t *)jmp_addr |= ((addr - (jmp_addr + 8)) >> 2) & 0xffffff;
+#if QEMU_GNUC_PREREQ(4, 1)
+ __clear_cache((char *) jmp_addr, (char *) jmp_addr + 4);
+#else
/* flush icache */
_beg = jmp_addr;
_end = jmp_addr + 4;
_flg = 0;
__asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));
+#endif
}
#endif
