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[Qemu-devel] [5843] Use libgcc __clear_cache to clean icache, when avail
From: |
Andrzej Zaborowski |
Subject: |
[Qemu-devel] [5843] Use libgcc __clear_cache to clean icache, when available. |
Date: |
Mon, 01 Dec 2008 02:02:37 +0000 |
Revision: 5843
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5843
Author: balrog
Date: 2008-12-01 02:02:37 +0000 (Mon, 01 Dec 2008)
Log Message:
-----------
Use libgcc __clear_cache to clean icache, when available.
Calling the clear cache syscall directly generates an illegal instruction
on some (armv4) kernels.
Modified Paths:
--------------
trunk/exec-all.h
trunk/tcg/arm/tcg-target.h
Modified: trunk/exec-all.h
===================================================================
--- trunk/exec-all.h 2008-12-01 01:53:55 UTC (rev 5842)
+++ trunk/exec-all.h 2008-12-01 02:02:37 UTC (rev 5843)
@@ -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
Modified: trunk/tcg/arm/tcg-target.h
===================================================================
--- trunk/tcg/arm/tcg-target.h 2008-12-01 01:53:55 UTC (rev 5842)
+++ trunk/tcg/arm/tcg-target.h 2008-12-01 02:02:37 UTC (rev 5843)
@@ -69,8 +69,13 @@
static inline void flush_icache_range(unsigned long start, unsigned long stop)
{
+#if QEMU_GNUC_PREREQ(4, 1)
+ void __clear_cache(char *beg, char *end);
+ __clear_cache((char *) start, (char *) stop);
+#else
register unsigned long _beg __asm ("a1") = start;
register unsigned long _end __asm ("a2") = stop;
register unsigned long _flg __asm ("a3") = 0;
__asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));
+#endif
}
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