uint32_t HELPER(mul32)(CPUOpenRISCState *env, uint32_t ra, uint32_t rb) { uint64_t result; uint32_t high, cy; OpenRISCCPU *cpu = openrisc_env_get_cpu(env); result = (uint64_t)ra * rb; /* regisiers in or32 is 32bit, so 32 is NOT a magic number. or64 is not handled in this function, and not implement yet, TARGET_LONG_BITS for or64 is 64, it will break this function, so, we didn't use TARGET_LONG_BITS here. */ high = result >> 32; cy = result >> (32 - 1); if ((cy & 0x1) == 0x0) { if (high == 0x0) { return result; } } if ((cy & 0x1) == 0x1) { if (high == 0xffffffff) { return result; } } cpu->env.sr |= (SR_OV | SR_CY); if (cpu->env.sr & SR_OVE) { raise_exception(cpu, EXCP_RANGE); } return result; }