/* CPUClass::reset() */ static void m68k_cpu_reset(CPUState *s) { M68kCPU *cpu = M68K_CPU(s); M68kCPUClass *mcc = M68K_CPU_GET_CLASS(cpu); CPUM68KState *env = &cpu->env; floatx80 nan = floatx80_default_nan(NULL); int i; mcc->parent_reset(s); memset(env, 0, offsetof(CPUM68KState, end_reset_fields)); #ifdef CONFIG_SOFTMMU cpu_m68k_set_sr(env, SR_S | SR_I); #else cpu_m68k_set_sr(env, 0); #endif for (i = 0; i < 8; i++) { env->fregs[i].d = nan; } cpu_m68k_set_fpcr(env, 0); env->fpsr = 0; /* TODO: We should set PC from the interrupt vector. */ env->pc = 0; }
static floatx80 propagateFloatx80NaNOneArg(floatx80 a, float_status *status) { if (floatx80_is_signaling_nan(a, status)) { float_raise(float_flag_invalid, status); } if (status->default_nan_mode) { return floatx80_default_nan(status); } return floatx80_maybe_silence_nan(a, status); }
floatx80 floatx80_mod(floatx80 a, floatx80 b, float_status *status) { flag aSign, zSign; int32_t aExp, bExp, expDiff; uint64_t aSig0, aSig1, bSig; uint64_t qTemp, term0, term1; aSig0 = extractFloatx80Frac(a); aExp = extractFloatx80Exp(a); aSign = extractFloatx80Sign(a); bSig = extractFloatx80Frac(b); bExp = extractFloatx80Exp(b); if (aExp == 0x7FFF) { if ((uint64_t) (aSig0 << 1) || ((bExp == 0x7FFF) && (uint64_t) (bSig << 1))) { return propagateFloatx80NaN(a, b, status); } goto invalid; } if (bExp == 0x7FFF) { if ((uint64_t) (bSig << 1)) { return propagateFloatx80NaN(a, b, status); } return a; } if (bExp == 0) { if (bSig == 0) { invalid: float_raise(float_flag_invalid, status); return floatx80_default_nan(status); } normalizeFloatx80Subnormal(bSig, &bExp, &bSig); } if (aExp == 0) { if ((uint64_t) (aSig0 << 1) == 0) { return a; } normalizeFloatx80Subnormal(aSig0, &aExp, &aSig0); } bSig |= LIT64(0x8000000000000000); zSign = aSign; expDiff = aExp - bExp; aSig1 = 0; if (expDiff < 0) { return a; } qTemp = (bSig <= aSig0); if (qTemp) { aSig0 -= bSig; } expDiff -= 64; while (0 < expDiff) { qTemp = estimateDiv128To64(aSig0, aSig1, bSig); qTemp = (2 < qTemp) ? qTemp - 2 : 0; mul64To128(bSig, qTemp, &term0, &term1); sub128(aSig0, aSig1, term0, term1, &aSig0, &aSig1); shortShift128Left(aSig0, aSig1, 62, &aSig0, &aSig1); } expDiff += 64; if (0 < expDiff) { qTemp = estimateDiv128To64(aSig0, aSig1, bSig); qTemp = (2 < qTemp) ? qTemp - 2 : 0; qTemp >>= 64 - expDiff; mul64To128(bSig, qTemp << (64 - expDiff), &term0, &term1); sub128(aSig0, aSig1, term0, term1, &aSig0, &aSig1); shortShift128Left(0, bSig, 64 - expDiff, &term0, &term1); while (le128(term0, term1, aSig0, aSig1)) { ++qTemp; sub128(aSig0, aSig1, term0, term1, &aSig0, &aSig1); } }