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[Qemu-devel] [PATCH 07/20] w64: Fix definition of setjmp
From: |
Stefan Weil |
Subject: |
[Qemu-devel] [PATCH 07/20] w64: Fix definition of setjmp |
Date: |
Sun, 15 Apr 2012 16:13:40 +0200 |
The default definition of setjmp which is implemented in MinGW-w64
cannot be used with programs like QEMU which call longjmp from
code without structured exception handling (SEH).
This code therefore disables stack unwinding.
We could also implement SEH for QEMU's generated JIT code, but
that is much more difficult. Stack unwinding would also cost
execution time.
Signed-off-by: Stefan Weil <address@hidden>
---
qemu-os-win32.h | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/qemu-os-win32.h b/qemu-os-win32.h
index b6533c0..753679b 100644
--- a/qemu-os-win32.h
+++ b/qemu-os-win32.h
@@ -56,6 +56,15 @@
# define EWOULDBLOCK WSAEWOULDBLOCK
#endif
+#if defined(_WIN64)
+/* On w64, setjmp is implemented by _setjmp which needs a second parameter.
+ * If this parameter is NULL, longjump does no stack unwinding.
+ * That is what we need for QEMU. Passing the value of register rsp (default)
+ * lets longjmp try a stack unwinding which will crash with generated code. */
+# undef setjmp
+# define setjmp(env) _setjmp(env, NULL)
+#endif
+
/* Declaration of ffs() is missing in MinGW's strings.h. */
int ffs(int i);
--
1.7.0.4
- [Qemu-devel] [PATCH 19/20] w64: Fix time conversion for some versions of MinGW-w64, (continued)
- [Qemu-devel] [PATCH 19/20] w64: Fix time conversion for some versions of MinGW-w64, Stefan Weil, 2012/04/15
- [Qemu-devel] [PATCH 12/20] w64: Fix data types in softmmu*.h, Stefan Weil, 2012/04/15
- [Qemu-devel] [PATCH 20/20] block: Avoid compiler warning for w64, Stefan Weil, 2012/04/15
- [Qemu-devel] [PATCH 18/20] nbd: Fix compiler warning (w64), Stefan Weil, 2012/04/15
- [Qemu-devel] [PATCH 15/20] target-ppc: Fix type casts for w64 (uintptr_t), Stefan Weil, 2012/04/15
- [Qemu-devel] [PATCH 17/20] disas: Replace 'unsigned long' by 'uintptr_t', Stefan Weil, 2012/04/15
- [Qemu-devel] [PATCH 07/20] w64: Fix definition of setjmp,
Stefan Weil <=
- Re: [Qemu-devel] [PATCH 07/20] w64: Fix definition of setjmp, Blue Swirl, 2012/04/15
- Re: [Qemu-devel] [PATCH 07/20] w64: Fix definition of setjmp, Stefan Weil, 2012/04/15
- Re: [Qemu-devel] [PATCH 07/20] w64: Fix definition of setjmp, Blue Swirl, 2012/04/15
- Re: [Qemu-devel] [PATCH 07/20] w64: Fix definition of setjmp, Stefan Weil, 2012/04/15
- Re: [Qemu-devel] [PATCH 07/20] w64: Fix definition of setjmp, Blue Swirl, 2012/04/15
- Re: [Qemu-devel] [PATCH 07/20] w64: Fix definition of setjmp, Stefan Weil, 2012/04/15
[Qemu-devel] [PATCH 10/20] softmmu: Use uintptr_t for physaddr, Stefan Weil, 2012/04/15
[Qemu-devel] [PATCH 04/20] w64: Fix data types in cpu-all.h, exec.c, Stefan Weil, 2012/04/15