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| author | Pierrick Bouvier <pierrick.bouvier@linaro.org> | 2023-02-21 16:30:04 +0100 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2023-02-21 13:45:48 -1000 |
| commit | dbd672c87f19949bb62bfb1fb3a97b9729fd7560 (patch) | |
| tree | 48261c1a254b426e8516c609ee0f3cf39beb95b9 /include/sysemu/os-win32.h | |
| parent | b3c326029554a7d134e26e749240ba2d8ac288b1 (diff) | |
| download | qemu-dbd672c87f19949bb62bfb1fb3a97b9729fd7560.zip qemu-dbd672c87f19949bb62bfb1fb3a97b9729fd7560.tar.gz qemu-dbd672c87f19949bb62bfb1fb3a97b9729fd7560.tar.bz2 | |
sysemu/os-win32: fix setjmp/longjmp on windows-arm64
Windows implementation of setjmp/longjmp is done in
C:/WINDOWS/system32/ucrtbase.dll. Alas, on arm64, it seems to *always*
perform stack unwinding, which crashes from generated code.
By using alternative implementation built in mingw, we avoid doing stack
unwinding and this fixes crash when calling longjmp.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230221153006.20300-3-pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'include/sysemu/os-win32.h')
| -rw-r--r-- | include/sysemu/os-win32.h | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/include/sysemu/os-win32.h b/include/sysemu/os-win32.h index 5b38c7b..97d0243 100644 --- a/include/sysemu/os-win32.h +++ b/include/sysemu/os-win32.h @@ -51,14 +51,34 @@ typedef struct sockaddr_un { extern "C" { #endif -#if defined(_WIN64) -/* On w64, setjmp is implemented by _setjmp which needs a second parameter. +#if defined(__aarch64__) +/* + * On windows-arm64, setjmp is available in only one variant, and longjmp always + * does stack unwinding. This crash with generated code. + * Thus, we use another implementation of setjmp (not windows one), coming from + * mingw, which never performs stack unwinding. + */ +#undef setjmp +#undef longjmp +/* + * These functions are not declared in setjmp.h because __aarch64__ defines + * setjmp to _setjmpex instead. However, they are still defined in libmingwex.a, + * which gets linked automatically. + */ +extern int __mingw_setjmp(jmp_buf); +extern void __attribute__((noreturn)) __mingw_longjmp(jmp_buf, int); +#define setjmp(env) __mingw_setjmp(env) +#define longjmp(env, val) __mingw_longjmp(env, val) +#elif defined(_WIN64) +/* + * On windows-x64, 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. */ + * lets longjmp try a stack unwinding which will crash with generated code. + */ # undef setjmp # define setjmp(env) _setjmp(env, NULL) -#endif +#endif /* __aarch64__ */ /* QEMU uses sigsetjmp()/siglongjmp() as the portable way to specify * "longjmp and don't touch the signal masks". Since we know that the * savemask parameter will always be zero we can safely define these |