diff options
Diffstat (limited to 'sim/bfin/bfin-sim.c')
| -rw-r--r-- | sim/bfin/bfin-sim.c | 41 |
1 files changed, 33 insertions, 8 deletions
diff --git a/sim/bfin/bfin-sim.c b/sim/bfin/bfin-sim.c index 5df7340..ba0e0c2 100644 --- a/sim/bfin/bfin-sim.c +++ b/sim/bfin/bfin-sim.c @@ -1562,10 +1562,11 @@ extract_mult (SIM_CPU *cpu, bu64 res, int mmod, int MM, static bu32 decode_macfunc (SIM_CPU *cpu, int which, int op, int h0, int h1, int src0, - int src1, int mmod, int MM, int fullword, bu32 *overflow) + int src1, int mmod, int MM, int fullword, bu32 *overflow, + bu32 *neg) { bu64 acc; - bu32 sat = 0, tsat; + bu32 sat = 0, tsat, ret; /* Sign extend accumulator if necessary, otherwise unsigned. */ if (mmod == 0 || mmod == M_T || mmod == M_IS || mmod == M_ISS2 @@ -1658,6 +1659,9 @@ decode_macfunc (SIM_CPU *cpu, int which, int op, int h0, int h1, int src0, default: illegal_instruction (cpu); } + + if (acc & 0x8000000000ull) + *neg = 1; } STORE (AXREG (which), (acc >> 32) & 0xff); @@ -1666,7 +1670,20 @@ decode_macfunc (SIM_CPU *cpu, int which, int op, int h0, int h1, int src0, if (sat) STORE (ASTATREG (avs[which]), sat); - return extract_mult (cpu, acc, mmod, MM, fullword, overflow); + ret = extract_mult (cpu, acc, mmod, MM, fullword, overflow); + + if (!fullword) + { + if (ret & 0x8000) + *neg = 1; + } + else + { + if (ret & 0x80000000) + *neg = 1; + } + + return ret; } bu32 @@ -3702,7 +3719,7 @@ decode_dsp32mac_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) int h01 = ((iw1 >> DSP32Mac_h01_bits) & DSP32Mac_h01_mask); bu32 res = DREG (dst); - bu32 v_i = 0, zero = 0; + bu32 v_i = 0, zero = 0, n_1 = 0, n_0 = 0; static const char * const ops[] = { "=", "+=", "-=" }; char _buf[128], *buf = _buf; @@ -3727,7 +3744,7 @@ decode_dsp32mac_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) if (w1 == 1 || op1 != 3) { bu32 res1 = decode_macfunc (cpu, 1, op1, h01, h11, src0, - src1, mmod, MM, P, &v_i); + src1, mmod, MM, P, &v_i, &n_1); if (w1) buf += sprintf (buf, P ? "R%i" : "R%i.H", dst + P); @@ -3773,7 +3790,7 @@ decode_dsp32mac_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) if (w0 == 1 || op0 != 3) { bu32 res0 = decode_macfunc (cpu, 0, op0, h00, h10, src0, - src1, mmod, 0, P, &v_i); + src1, mmod, 0, P, &v_i, &n_0); if (w0) buf += sprintf (buf, P ? "R%i" : "R%i.L", dst); @@ -3822,8 +3839,16 @@ decode_dsp32mac_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) if (v_i) SET_ASTATREG (vs, v_i); } - if (op0 == 3 || op1 == 3) - SET_ASTATREG (az, zero); + + if ((w0 == 1 && op0 == 3) || (w1 == 1 && op1 == 3)) + { + SET_ASTATREG (az, zero); + if (!(w0 == 1 && op0 == 3)) + n_0 = 0; + if (!(w1 == 1 && op1 == 3)) + n_1 = 0; + SET_ASTATREG (an, n_1 | n_0); + } } static void |