diff options
| author | Aurelien Jarno <aurelien@aurel32.net> | 2010-12-31 17:50:27 +0100 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2010-12-31 22:22:26 +0100 |
| commit | 8aac08b10b2e8c131b9385d2dc37e4a02e1d12c1 (patch) | |
| tree | 2e04d62a85f6bcd15f11cdea14a7e4f83482eabf /target-arm | |
| parent | 6d5c34fa027d1477c0572ea74421e21b0f733838 (diff) | |
target-arm: fix UMAAL instruction
UMAAL should use unsigned multiply instead of signed.
This patch fixes this issue by handling UMAAL separately from
UMULL/UMLAL/SMULL/SMLAL as these instructions are different
enough. It also explicitly list instructions in case and catch
nonexistent instruction as illegal. Also fixes a few style issues.
This fixes the issues reported in
https://bugs.launchpad.net/qemu/+bug/696015
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'target-arm')
| -rw-r--r-- | target-arm/translate.c | 32 |
1 files changed, 22 insertions, 10 deletions
diff --git a/target-arm/translate.c b/target-arm/translate.c index 8d494ec924..2598268405 100644 --- a/target-arm/translate.c +++ b/target-arm/translate.c @@ -6637,26 +6637,38 @@ static void disas_arm_insn(CPUState * env, DisasContext *s) gen_logic_CC(tmp); store_reg(s, rd, tmp); break; - default: - /* 64 bit mul */ + case 4: + /* 64 bit mul double accumulate (UMAAL) */ + ARCH(6); tmp = load_reg(s, rs); tmp2 = load_reg(s, rm); - if (insn & (1 << 22)) + tmp64 = gen_mulu_i64_i32(tmp, tmp2); + gen_addq_lo(s, tmp64, rn); + gen_addq_lo(s, tmp64, rd); + gen_storeq_reg(s, rn, rd, tmp64); + tcg_temp_free_i64(tmp64); + break; + case 8: case 9: case 10: case 11: + case 12: case 13: case 14: case 15: + /* 64 bit mul: UMULL, UMLAL, SMULL, SMLAL. */ + tmp = load_reg(s, rs); + tmp2 = load_reg(s, rm); + if (insn & (1 << 22)) { tmp64 = gen_muls_i64_i32(tmp, tmp2); - else + } else { tmp64 = gen_mulu_i64_i32(tmp, tmp2); - if (insn & (1 << 21)) /* mult accumulate */ + } + if (insn & (1 << 21)) { /* mult accumulate */ gen_addq(s, tmp64, rn, rd); - if (!(insn & (1 << 23))) { /* double accumulate */ - ARCH(6); - gen_addq_lo(s, tmp64, rn); - gen_addq_lo(s, tmp64, rd); } - if (insn & (1 << 20)) + if (insn & (1 << 20)) { gen_logicq_cc(tmp64); + } gen_storeq_reg(s, rn, rd, tmp64); tcg_temp_free_i64(tmp64); break; + default: + goto illegal_op; } } else { rn = (insn >> 16) & 0xf; |