diff options
Diffstat (limited to 'target-s390x/op_helper.c')
| -rw-r--r-- | target-s390x/op_helper.c | 28 |
1 files changed, 8 insertions, 20 deletions
diff --git a/target-s390x/op_helper.c b/target-s390x/op_helper.c index 49760a40a2..db03a7971f 100644 --- a/target-s390x/op_helper.c +++ b/target-s390x/op_helper.c @@ -1731,25 +1731,15 @@ void HELPER(sqdbr)(uint32_t f1, uint32_t f2) env->fregs[f1].d = float64_sqrt(env->fregs[f2].d, &env->fpu_status); } -static inline uint64_t cksm_overflow(uint64_t cksm) -{ - if (cksm > 0xffffffffULL) { - cksm &= 0xffffffffULL; - cksm++; - } - return cksm; -} - /* checksum */ void HELPER(cksm)(uint32_t r1, uint32_t r2) { uint64_t src = get_address_31fix(r2); uint64_t src_len = env->regs[(r2 + 1) & 15]; - uint64_t cksm = 0; + uint64_t cksm = (uint32_t)env->regs[r1]; while (src_len >= 4) { cksm += ldl(src); - cksm = cksm_overflow(cksm); /* move to next word */ src_len -= 4; @@ -1760,26 +1750,24 @@ void HELPER(cksm)(uint32_t r1, uint32_t r2) case 0: break; case 1: - cksm += ldub(src); - cksm = cksm_overflow(cksm); + cksm += ldub(src) << 24; break; case 2: - cksm += lduw(src); - cksm = cksm_overflow(cksm); + cksm += lduw(src) << 16; break; case 3: - /* XXX check if this really is correct */ - cksm += lduw(src) << 8; - cksm += ldub(src + 2); - cksm = cksm_overflow(cksm); + cksm += lduw(src) << 16; + cksm += ldub(src + 2) << 8; break; } /* indicate we've processed everything */ + env->regs[r2] = src + src_len; env->regs[(r2 + 1) & 15] = 0; /* store result */ - env->regs[r1] = (env->regs[r1] & 0xffffffff00000000ULL) | (uint32_t)cksm; + env->regs[r1] = (env->regs[r1] & 0xffffffff00000000ULL) | + ((uint32_t)cksm + (cksm >> 32)); } static inline uint32_t cc_calc_ltgt_32(CPUState *env, int32_t src, |