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tcg/i386: Make direct jump patching thread-safe

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Ensure direct jump patching in i386 is atomic by:
 * naturally aligning a location of direct jump address;
 * using atomic_read()/atomic_set() for code patching.

tcg_out_nopn() implementation:
Suggested-by: Richard Henderson <rth@twiddle.net>.

Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Message-Id: <1461341333-19646-6-git-send-email-sergey.fedorov@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Sergey Fedorov 2016-04-22 19:08:47 +03:00 • committed by Richard Henderson
parent 399f164857
commit 0d07abf05e
2 changed files with 24 additions and 1 deletions
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2
include/exec/exec-all.h
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@ -313,7 +313,7 @@ void ppc_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr);
static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
{
/* patch the branch destination */
stl_le_p((void*)jmp_addr, addr - (jmp_addr + 4));
atomic_set((int32_t *)jmp_addr, addr - (jmp_addr + 4));
/* no need to flush icache explicitly */
}
#elif defined(__s390x__)