emul/8086: a little bit of cleanup in cpu.c
De-macroisation negatively impacts speed, but this emulator doesn't need to be fast. Clear code is more important.
This commit is contained in:
Virgil Dupras
parent
8760766bb4
commit
44abcaa8f8
161
emul/8086/cpu.c
161
emul/8086/cpu.c
@ -33,64 +33,6 @@
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#define getreg8(regid) regs.byteregs[byteregtable[regid]]
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#define putreg8(regid, writeval) regs.byteregs[byteregtable[regid]] = writeval
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#define makeflagsword() \
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( \
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2 | (uint16_t) cf | ((uint16_t) pf << 2) | ((uint16_t) af << 4) | ((uint16_t) zf << 6) | ((uint16_t) sf << 7) | \
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((uint16_t) tf << 8) | ((uint16_t) ifl << 9) | ((uint16_t) df << 10) | ((uint16_t) of << 11) \
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)
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#define decodeflagsword(x) { \
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temp16 = x; \
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cf = temp16 & 1; \
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pf = (temp16 >> 2) & 1; \
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af = (temp16 >> 4) & 1; \
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zf = (temp16 >> 6) & 1; \
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sf = (temp16 >> 7) & 1; \
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tf = (temp16 >> 8) & 1; \
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ifl = (temp16 >> 9) & 1; \
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df = (temp16 >> 10) & 1; \
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of = (temp16 >> 11) & 1; \
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}
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#define modregrm() { \
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addrbyte = getmem8(segregs[regcs], ip); \
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StepIP(1); \
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mode = addrbyte >> 6; \
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reg = (addrbyte >> 3) & 7; \
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rm = addrbyte & 7; \
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switch(mode) \
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{ \
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case 0: \
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if(rm == 6) { \
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disp16 = getmem16(segregs[regcs], ip); \
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StepIP(2); \
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} \
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if(((rm == 2) || (rm == 3)) && !segoverride) { \
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useseg = segregs[regss]; \
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} \
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break; \
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\
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case 1: \
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disp16 = signext(getmem8(segregs[regcs], ip)); \
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StepIP(1); \
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if(((rm == 2) || (rm == 3) || (rm == 6)) && !segoverride) { \
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useseg = segregs[regss]; \
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} \
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break; \
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\
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case 2: \
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disp16 = getmem16(segregs[regcs], ip); \
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StepIP(2); \
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if(((rm == 2) || (rm == 3) || (rm == 6)) && !segoverride) { \
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useseg = segregs[regss]; \
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} \
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break; \
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\
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default: \
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disp8 = 0; \
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disp16 = 0; \
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} \
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}
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uint8_t byteregtable[8] = { regal, regcl, regdl, regbl, regah, regch, regdh, regbh };
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static const uint8_t parity[0x100] = {
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@ -107,12 +49,11 @@ static const uint8_t parity[0x100] = {
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uint8_t RAM[0x100000];
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INTHOOK INTHOOKS[0x100] = {0};
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uint8_t opcode, segoverride, reptype, hltstate = 0;
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uint16_t segregs[4], savecs, saveip, ip, useseg, oldsp;
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uint8_t tempcf, oldcf, cf, pf, af, zf, sf, tf, ifl, df, of, mode, reg, rm;
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uint16_t oper1, oper2, res16, disp16, temp16, dummy, stacksize, frametemp;
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uint8_t oper1b, oper2b, res8, disp8, temp8, nestlev, addrbyte;
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uint32_t temp1, temp2, temp3, temp4, temp5, temp32, tempaddr32, ea;
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uint64_t totalexec;
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uint16_t segregs[4], ip, useseg, oldsp;
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uint8_t tempcf, cf, pf, af, zf, sf, tf, ifl, df, of, mode, reg, rm;
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uint16_t oper1, oper2, res16, disp16, temp16, stacksize, frametemp;
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uint8_t oper1b, oper2b, res8, disp8, nestlev, addrbyte;
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uint32_t temp1, temp2, temp3, ea;
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union _bytewordregs_ regs;
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@ -126,8 +67,7 @@ static uint8_t portin (uint16_t portnum) { return 0; }
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static uint16_t portin16 (uint16_t portnum) { return 0; }
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void write86 (uint32_t addr32, uint8_t value) {
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tempaddr32 = addr32 & 0xFFFFF;
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RAM[tempaddr32] = value;
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RAM[addr32 & 0xFFFFF] = value;
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}
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void writew86 (uint32_t addr32, uint16_t value) {
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@ -1169,19 +1109,71 @@ void intcall86(uint8_t intnum) {
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return;
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}
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fprintf(stderr, "Unknown INT called: %x\n", intnum);
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/*push (makeflagsword() );
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push (segregs[regcs]);
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push (ip);
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segregs[regcs] = getmem16 (0, (uint16_t) intnum * 4 + 2);
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ip = getmem16 (0, (uint16_t) intnum * 4);
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ifl = 0;
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tf = 0;*/
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}
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uint16_t makeflagsword() {
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return 2 | (uint16_t) cf | ((uint16_t) pf << 2) | ((uint16_t) af << 4) | \
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((uint16_t) zf << 6) | ((uint16_t) sf << 7) | ((uint16_t) tf << 8) | \
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((uint16_t) ifl << 9) | ((uint16_t) df << 10) | ((uint16_t) of << 11);
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}
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void decodeflagsword(uint16_t x) {
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cf = x & 1;
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pf = (x >> 2) & 1;
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af = (x >> 4) & 1;
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zf = (x >> 6) & 1;
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sf = (x >> 7) & 1;
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tf = (x >> 8) & 1;
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ifl = (x >> 9) & 1;
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df = (x >> 10) & 1;
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of = (x >> 11) & 1;
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}
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static void modregrm() {
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addrbyte = getmem8(segregs[regcs], ip);
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StepIP(1);
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mode = addrbyte >> 6;
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reg = (addrbyte >> 3) & 7;
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rm = addrbyte & 7;
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switch(mode)
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{
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case 0:
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if (rm == 6) {
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disp16 = getmem16(segregs[regcs], ip);
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StepIP(2);
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}
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if (((rm == 2) || (rm == 3)) && !segoverride) {
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useseg = segregs[regss];
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}
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break;
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case 1:
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disp16 = signext(getmem8(segregs[regcs], ip));
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StepIP(1);
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if (((rm == 2) || (rm == 3) || (rm == 6)) && !segoverride) {
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useseg = segregs[regss];
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}
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break;
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case 2:
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disp16 = getmem16(segregs[regcs], ip);
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StepIP(2);
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if (((rm == 2) || (rm == 3) || (rm == 6)) && !segoverride) {
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useseg = segregs[regss];
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}
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break;
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default:
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disp8 = 0;
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disp16 = 0;
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}
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}
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int exec86(int execloops) {
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int loopcount;
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uint8_t docontinue;
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static uint16_t firstip;
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uint16_t oldcf;
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for (loopcount = 0; loopcount < execloops; loopcount++) {
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if (hltstate) return 0;
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@ -1195,8 +1187,6 @@ int exec86(int execloops) {
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while (!docontinue) {
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segregs[regcs] = segregs[regcs] & 0xFFFF;
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ip = ip & 0xFFFF;
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savecs = segregs[regcs];
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saveip = ip;
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opcode = getmem8 (segregs[regcs], ip);
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StepIP (1);
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@ -1237,8 +1227,6 @@ int exec86(int execloops) {
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}
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}
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totalexec++;
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switch (opcode) {
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case 0x0: /* 00 ADD Eb Gb */
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modregrm();
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@ -1962,7 +1950,7 @@ int exec86(int execloops) {
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regs.wordregs[regdi] = pop();
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regs.wordregs[regsi] = pop();
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regs.wordregs[regbp] = pop();
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dummy = pop();
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pop();
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regs.wordregs[regbx] = pop();
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regs.wordregs[regdx] = pop();
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regs.wordregs[regcx] = pop();
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@ -2062,7 +2050,6 @@ int exec86(int execloops) {
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regs.wordregs[regcx] = regs.wordregs[regcx] - 1;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2090,7 +2077,6 @@ int exec86(int execloops) {
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regs.wordregs[regcx] = regs.wordregs[regcx] - 1;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2118,7 +2104,6 @@ int exec86(int execloops) {
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regs.wordregs[regcx] = regs.wordregs[regcx] - 1;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2146,7 +2131,6 @@ int exec86(int execloops) {
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regs.wordregs[regcx] = regs.wordregs[regcx] - 1;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2522,8 +2506,7 @@ int exec86(int execloops) {
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break;
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case 0x9D: /* 9D POPF */
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temp16 = pop();
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decodeflagsword (temp16);
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decodeflagsword (pop());
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break;
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case 0x9E: /* 9E SAHF */
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@ -2574,7 +2557,6 @@ int exec86(int execloops) {
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regs.wordregs[regcx] = regs.wordregs[regcx] - 1;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2602,7 +2584,6 @@ int exec86(int execloops) {
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regs.wordregs[regcx] = regs.wordregs[regcx] - 1;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2639,7 +2620,6 @@ int exec86(int execloops) {
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break;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2677,7 +2657,6 @@ int exec86(int execloops) {
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break;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2717,7 +2696,6 @@ int exec86(int execloops) {
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regs.wordregs[regcx] = regs.wordregs[regcx] - 1;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2743,7 +2721,6 @@ int exec86(int execloops) {
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regs.wordregs[regcx] = regs.wordregs[regcx] - 1;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2769,7 +2746,6 @@ int exec86(int execloops) {
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regs.wordregs[regcx] = regs.wordregs[regcx] - 1;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2796,7 +2772,6 @@ int exec86(int execloops) {
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regs.wordregs[regcx] = regs.wordregs[regcx] - 1;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2831,7 +2806,6 @@ int exec86(int execloops) {
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break;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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@ -2866,7 +2840,6 @@ int exec86(int execloops) {
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break;
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}
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totalexec++;
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loopcount++;
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if (!reptype) {
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break;
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