diff options
| author | Sergey Fedorov <serge.fdrv@gmail.com> | 2016-04-22 19:08:46 +0300 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2016-05-12 14:06:40 -1000 |
| commit | 399f1648573d49b9411089e4e2ea62b6357b166e (patch) | |
| tree | b11495d97aab8616980103f3648f6599a1f15944 /tcg/ppc | |
| parent | 76442a939ef8fc062b35a890a824de203bb5bd5f (diff) | |
| download | qemu-399f1648573d49b9411089e4e2ea62b6357b166e.zip | |
tcg/ppc: Make direct jump patching thread-safe
Ensure direct jump patching in PPC is atomic by:
* limiting translation buffer size in 32-bit mode to be addressable by
Branch I-form instruction;
* 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>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <1461341333-19646-5-git-send-email-sergey.fedorov@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg/ppc')
| -rw-r--r-- | tcg/ppc/tcg-target.inc.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/tcg/ppc/tcg-target.inc.c b/tcg/ppc/tcg-target.inc.c index 00bb90fc25..039fa77748 100644 --- a/tcg/ppc/tcg-target.inc.c +++ b/tcg/ppc/tcg-target.inc.c @@ -1237,6 +1237,7 @@ static void tcg_out_brcond2 (TCGContext *s, const TCGArg *args, tcg_out_bc(s, BC | BI(7, CR_EQ) | BO_COND_TRUE, arg_label(args[5])); } +#ifdef __powerpc64__ void ppc_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr) { tcg_insn_unit i1, i2; @@ -1265,11 +1266,18 @@ void ppc_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr) pair = (uint64_t)i2 << 32 | i1; #endif - /* ??? __atomic_store_8, presuming there's some way to do that - for 32-bit, otherwise this is good enough for 64-bit. */ - *(uint64_t *)jmp_addr = pair; + atomic_set((uint64_t *)jmp_addr, pair); flush_icache_range(jmp_addr, jmp_addr + 8); } +#else +void ppc_tb_set_jmp_target(uintptr_t jmp_addr, uintptr_t addr) +{ + intptr_t diff = addr - jmp_addr; + tcg_debug_assert(in_range_b(diff)); + atomic_set((uint32_t *)jmp_addr, B | (diff & 0x3fffffc)); + flush_icache_range(jmp_addr, jmp_addr + 4); +} +#endif static void tcg_out_call(TCGContext *s, tcg_insn_unit *target) { @@ -1895,7 +1903,9 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args, break; case INDEX_op_goto_tb: tcg_debug_assert(s->tb_jmp_offset); - /* Direct jump. Ensure the next insns are 8-byte aligned. */ + /* Direct jump. */ +#ifdef __powerpc64__ + /* Ensure the next insns are 8-byte aligned. */ if ((uintptr_t)s->code_ptr & 7) { tcg_out32(s, NOP); } @@ -1904,6 +1914,10 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args, s->code_ptr += 2; tcg_out32(s, MTSPR | RS(TCG_REG_TMP1) | CTR); tcg_out32(s, BCCTR | BO_ALWAYS); +#else + /* To be replaced by a branch. */ + s->code_ptr++; +#endif s->tb_next_offset[args[0]] = tcg_current_code_size(s); break; case INDEX_op_br: |