diff options
| author | Emilio G. Cota <cota@braap.org> | 2016-06-27 15:02:10 -0400 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2016-10-26 08:29:02 -0700 |
| commit | cf12bce088f22b92bf62ffa0d7f6a3e951e355a9 (patch) | |
| tree | 6b7239e6d9cce2a7b64bb2289b0b85ca81263791 /target-arm | |
| parent | 354161b37c6465a32073eac5f16fa35939af2bb4 (diff) | |
target-arm: emulate SWP with atomic_xchg helper
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1467054136-10430-25-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'target-arm')
| -rw-r--r-- | target-arm/translate.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/target-arm/translate.c b/target-arm/translate.c index cc97d1ed46..7c32c9462a 100644 --- a/target-arm/translate.c +++ b/target-arm/translate.c @@ -8789,25 +8789,27 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) } tcg_temp_free_i32(addr); } else { + TCGv taddr; + TCGMemOp opc = s->be_data; + /* SWP instruction */ rm = (insn) & 0xf; - /* ??? This is not really atomic. However we know - we never have multiple CPUs running in parallel, - so it is good enough. */ - addr = load_reg(s, rn); - tmp = load_reg(s, rm); - tmp2 = tcg_temp_new_i32(); if (insn & (1 << 22)) { - gen_aa32_ld8u(s, tmp2, addr, get_mem_index(s)); - gen_aa32_st8(s, tmp, addr, get_mem_index(s)); + opc |= MO_UB; } else { - gen_aa32_ld32u(s, tmp2, addr, get_mem_index(s)); - gen_aa32_st32(s, tmp, addr, get_mem_index(s)); + opc |= MO_UL | MO_ALIGN; } - tcg_temp_free_i32(tmp); + + addr = load_reg(s, rn); + taddr = gen_aa32_addr(s, addr, opc); tcg_temp_free_i32(addr); - store_reg(s, rd, tmp2); + + tmp = load_reg(s, rm); + tcg_gen_atomic_xchg_i32(tmp, taddr, tmp, + get_mem_index(s), opc); + tcg_temp_free(taddr); + store_reg(s, rd, tmp); } } } else { |