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Anselm Levskaya
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30c794bd6f
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cpux86-ta.js
51
cpux86-ta.js
@ -3,6 +3,8 @@
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Opcode ref
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http://ref.x86asm.net/coder32.html#xC4
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http://en.wikibooks.org/wiki/X86_Assembly/X86_Architecture
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http://en.wikipedia.org/wiki/X86
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http://en.wikipedia.org/wiki/Control_register
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http://en.wikipedia.org/wiki/X86_assembly_language
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@ -80,7 +82,31 @@ function CPU_X86() {
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this.cc_op2 = 0; // current op, byte2
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this.cc_dst2 = 0; // current dest, byte2
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this.df = 1;
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/*
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0. CF : Carry Flag. Set if the last arithmetic operation carried (addition) or borrowed (subtraction) a
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bit beyond the size of the register. This is then checked when the operation is followed with
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an add-with-carry or subtract-with-borrow to deal with values too large for just one register to contain.
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2. PF : Parity Flag. Set if the number of set bits in the least significant byte is a multiple of 2.
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4. AF : Adjust Flag. Carry of Binary Code Decimal (BCD) numbers arithmetic operations.
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6. ZF : Zero Flag. Set if the result of an operation is Zero (0).
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7. SF : Sign Flag. Set if the result of an operation is negative.
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8. TF : Trap Flag. Set if step by step debugging.
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9. IF : Interruption Flag. Set if interrupts are enabled.
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10. DF : Direction Flag. Stream direction. If set, string operations will decrement their pointer rather
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than incrementing it, reading memory backwards.
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11. OF : Overflow Flag. Set if signed arithmetic operations result in a value too large for the register to contain.
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12-13. IOPL : I/O Privilege Level field (2 bits). I/O Privilege Level of the current process.
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14. NT : Nested Task flag. Controls chaining of interrupts. Set if the current process is linked to the next process.
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16. RF : Resume Flag. Response to debug exceptions.
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17. VM : Virtual-8086 Mode. Set if in 8086 compatibility mode.
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18. AC : Alignment Check. Set if alignment checking of memory references is done.
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19. VIF : Virtual Interrupt Flag. Virtual image of IF.
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20. VIP : Virtual Interrupt Pending flag. Set if an interrupt is pending.
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21. ID : Identification Flag. Support for CPUID instruction if can be set.
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*/
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this.eflags = 0x2; // EFLAG register
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this.cycle_count = 0;
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this.hard_irq = 0;
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this.hard_intno = -1;
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@ -1852,7 +1878,7 @@ CPU_X86.prototype.exec_internal = function(ua, va) {
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}
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return qc;
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}
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function bd() {
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function check_parity() {
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if (_op == 24) {
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return (_src >> 2) & 1;
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} else {
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@ -2003,7 +2029,7 @@ CPU_X86.prototype.exec_internal = function(ua, va) {
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qc = (_op == 24 ? ((_src >> 7) & 1) : (_dst < 0));
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break;
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case 5:
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qc = bd();
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qc = check_parity();
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break;
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case 6:
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qc = cd();
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@ -2017,10 +2043,10 @@ CPU_X86.prototype.exec_internal = function(ua, va) {
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return qc ^ (gd & 1);
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}
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function lc() {
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return (bd() << 2) | ((_dst == 0) << 6) | ((_op == 24 ? ((_src >> 7) & 1) : (_dst < 0)) << 7) | ed();
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return (check_parity() << 2) | ((_dst == 0) << 6) | ((_op == 24 ? ((_src >> 7) & 1) : (_dst < 0)) << 7) | ed();
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}
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function hd() {
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return (check_carry() << 0) | (bd() << 2) | ((_dst == 0) << 6) | ((_op == 24 ? ((_src >> 7) & 1) : (_dst < 0)) << 7) | (check_overflow() << 11) | ed();
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return (check_carry() << 0) | (check_parity() << 2) | ((_dst == 0) << 6) | ((_op == 24 ? ((_src >> 7) & 1) : (_dst < 0)) << 7) | (check_overflow() << 11) | ed();
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}
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function id() {
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var jd;
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@ -7065,7 +7091,7 @@ CPU_X86.prototype.exec_internal = function(ua, va) {
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}
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break Fd;
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case 0x7a:
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if (bd()) {
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if (check_parity()) {
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ga = ((phys_mem8[Kb++] << 24) >> 24);
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Kb = (Kb + ga) >> 0;
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} else {
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@ -7073,7 +7099,7 @@ CPU_X86.prototype.exec_internal = function(ua, va) {
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}
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break Fd;
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case 0x7b:
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if (!bd()) {
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if (!check_parity()) {
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ga = ((phys_mem8[Kb++] << 24) >> 24);
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Kb = (Kb + ga) >> 0;
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} else {
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@ -7241,27 +7267,33 @@ CPU_X86.prototype.exec_internal = function(ua, va) {
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Ae(4, 1, 0, Ha, 0);
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}
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break Fd;
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//62 r 01+ f BOUND r16/32 m16/32&16/32 eFlags ..i..... ..i..... ..i..... Check Array Index Against Bounds
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case 0x62:
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Hf();
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break Fd;
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// F5 CMC .......c .......c .......c Complement Carry Flag
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case 0xf5:
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_src = hd() ^ 0x0001;
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_dst = ((_src >> 6) & 1) ^ 1;
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_op = 24;
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break Fd;
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//F8 CLC .......c .......c .......c Clear Carry Flag
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case 0xf8:
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_src = hd() & ~0x0001;
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_dst = ((_src >> 6) & 1) ^ 1;
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_op = 24;
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break Fd;
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//F9 STC .......c .......c .......C Set Carry Flag
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case 0xf9:
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_src = hd() | 0x0001;
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_dst = ((_src >> 6) & 1) ^ 1;
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_op = 24;
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break Fd;
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//FC CLD .d...... .d...... .d...... Clear Direction Flag
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case 0xfc:
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cpu.df = 1;
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break Fd;
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//FD STD .d...... .d...... .D...... Set Direction Flag
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case 0xfd:
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cpu.df = -1;
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break Fd;
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@ -7296,12 +7328,18 @@ CPU_X86.prototype.exec_internal = function(ua, va) {
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cpu.halted = 1;
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La = 257;
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break Bg;
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//A4 MOVS m8 m8 .d...... Move Data from String to String
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//MOVSB m8 m8
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case 0xa4:
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dg();
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break Fd;
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//A5 MOVS m16 m16 .d...... Move Data from String to String
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//MOVSW m16 m16
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case 0xa5:
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sg();
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break Fd;
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//AA STOS m8 AL .d...... Store String
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//STOSB m8 AL
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case 0xaa:
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fg();
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break Fd;
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@ -10388,4 +10426,5 @@ PCEmulator.prototype.reset = function() { this.request_request = 1; };
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