[PULL,11/39] tcg/mips: Make direct jump patching thread-safe
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Message ID 1463098420-29113-12-git-send-email-rth@twiddle.net
State New
Headers show

Commit Message

Richard Henderson May 13, 2016, 12:13 a.m. UTC
From: Sergey Fedorov <serge.fdrv@gmail.com>

Ensure direct jump patching in MIPS is atomic by using
atomic_read()/atomic_set() for code patching.

Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Message-Id: <1461341333-19646-11-git-send-email-sergey.fedorov@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
[rth: Merged the deposit32 followup.]
[rth: Merged the following followup.]
Message-Id: <1462210518-26522-1-git-send-email-sergey.fedorov@linaro.org>
---
 tcg/mips/tcg-target.inc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Patch
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diff --git a/tcg/mips/tcg-target.inc.c b/tcg/mips/tcg-target.inc.c
index aaf881c..1e5a6b4 100644
--- a/tcg/mips/tcg-target.inc.c
+++ b/tcg/mips/tcg-target.inc.c
@@ -1885,7 +1885,6 @@  static void tcg_target_init(TCGContext *s)
 
 void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)
 {
-    uint32_t *ptr = (uint32_t *)jmp_addr;
-    *ptr = deposit32(*ptr, 0, 26, addr >> 2);
+    atomic_set((uint32_t *)jmp_addr, deposit32(OPC_J, 0, 26, addr >> 2));
     flush_icache_range(jmp_addr, jmp_addr + 4);
 }