diff options
| -rw-r--r-- | ops.yaml | 596 |
1 files changed, 68 insertions, 528 deletions
@@ -1,6 +1,10 @@ --- # src: http://www.pastraiser.com/cpu/gameboy/gameboy_opcodes.html # src: http://www.devrs.com/gb/files/opcodes.html +# TODO: DAA, see +# http://datasheets.chipdb.org/Zilog/Z80/z80-documented-0.90.pdf +# http://forums.nesdev.com/viewtopic.php?t=9088 + ops: main: - id: NOP @@ -488,7 +492,7 @@ ops: c: code: | { - if (!(cpu_rb(ctx, RB_F) & F_Z)) { + if (!FLAG(ctx, Z)) { // get offset const int8_t ofs = (int8_t) mmu_rb(ctx, old_pc + 1); @@ -615,7 +619,7 @@ ops: c: C code: | { - if (cpu_rb(ctx, RB_F) & F_Z) { + if (FLAG(ctx, Z)) { // get offset const int8_t ofs = (int8_t) mmu_rb(ctx, old_pc + 1); @@ -1021,7 +1025,7 @@ ops: c: C code: | cpu_wf(ctx, F_N | F_H | F_C, ( - (cpu_rb(ctx, RB_F) & F_C ? 0 : F_C) + (FLAG(ctx, C) ? 0 : F_C) )); - id: LD B, B hex: 0x40 @@ -2225,7 +2229,7 @@ ops: // get old and new value const uint8_t o = cpu_rb(ctx, RB_A), n = cpu_rb(ctx, mmu_rb(ctx, cpu_rw(ctx, RW_HL))), - c = (cpu_rb(ctx, RB_F) & F_C) ? 1 : 0; + c = FLAG(ctx, C) ? 1 : 0; const uint16_t v = o + n + c; // write value @@ -2495,7 +2499,7 @@ ops: // get old and new value const uint8_t o = cpu_rb(ctx, RB_A), n = mmu_rb(ctx, cpu_rw(ctx, RW_HL)), - c = (cpu_rb(ctx, RB_F) & F_C) ? 1 : 0, + c = FLAG(ctx, C) ? 1 : 0, v = o - (n + c); // write value @@ -3044,7 +3048,7 @@ ops: h: c: code: | - if (~cpu_rb(ctx, RB_F) & F_Z) { + if (!FLAG(ctx, Z)) { pop_rw(ctx, RW_PC); ctx->cpu.clock += 12; @@ -3081,7 +3085,7 @@ ops: h: c: code: | - if (~cpu_rb(ctx, RB_F) & F_Z) { + if (!FLAG(ctx, Z)) { // jump cpu_ww(ctx, RW_PC, mmu_rw(ctx, old_pc + 1)); @@ -3120,7 +3124,7 @@ ops: h: c: code: | - if (~cpu_rb(ctx, RB_F) & F_Z) { + if (!FLAG(ctx, Z)) { // push pc push_rw(ctx, RW_PC); @@ -3205,7 +3209,7 @@ ops: h: c: code: | - if (cpu_rb(ctx, RB_F) & F_Z) { + if (FLAG(ctx, Z)) { // pop pc pop_rw(ctx, RW_PC); @@ -3245,7 +3249,7 @@ ops: h: c: code: | - if (cpu_rb(ctx, RB_F) & F_Z) { + if (FLAG(ctx, Z)) { // jump cpu_ww(ctx, RW_PC, mmu_rw(ctx, old_pc + 1)); @@ -3277,7 +3281,7 @@ ops: h: c: code: | - if (cpu_rb(ctx, RB_F) & F_Z) { + if (FLAG(ctx, Z)) { // push pc push_rw(ctx, RW_PC); @@ -3340,7 +3344,7 @@ ops: t: 20 f: 8 code: | - if (~cpu_rb(ctx, RB_F) & F_C) { + if (!FLAG(ctx, C)) { // pop pc pop_rw(ctx, RW_PC); @@ -3385,7 +3389,7 @@ ops: h: c: code: | - if (~cpu_rb(ctx, RB_F) & F_C) { + if (!FLAG(ctx, C)) { // jump cpu_ww(ctx, RW_PC, mmu_rw(ctx, old_pc + 1)); @@ -3442,23 +3446,7 @@ ops: h: H c: C code: | - { - // get old and new value - const uint8_t o = cpu_rb(ctx, RB_A), - n = mmu_rb(ctx, old_pc + 1), - v = o - n; - - // write value - cpu_wb(ctx, RB_A, v); - - // set flags - cpu_wf(ctx, F_Z | F_N | F_H | F_C, ( - (v ? 0 : F_Z) | - F_N | - ((((o & 0x0F) - (n & 0x0F)) & 0xF0) ? F_H : 0) | - ((n > o) ? F_C : 0) - )); - } + sub_d8(ctx, old_pc + 1); - id: RST 10H hex: 0xD7 cat: "jumps/calls" @@ -3488,7 +3476,7 @@ ops: h: c: code: | - if (cpu_rb(ctx, RB_F) & F_C) { + if (FLAG(ctx, C)) { // pop pc pop_rw(ctx, RW_PC); @@ -3531,7 +3519,7 @@ ops: h: c: code: | - if (cpu_rb(ctx, RB_F) & F_C) { + if (FLAG(ctx, C)) { // jump cpu_ww(ctx, RW_PC, mmu_rw(ctx, old_pc + 1)); @@ -3561,7 +3549,7 @@ ops: h: c: code: | - if (cpu_rb(ctx, RB_F) & F_C) { + if (FLAG(ctx, C)) { // push pc push_rw(ctx, RW_PC); @@ -4105,21 +4093,7 @@ ops: h: "0" c: C code: | - { - // get old value, carry bit, and new value - const uint16_t addr = cpu_rw(ctx, RW_HL); - const uint8_t o = mmu_rb(ctx, addr), - c = (o & 0x80) ? 1 : 0, - n = ((o & 0x7F) << 1) + c; - // set value - mmu_wb(ctx, addr, n); - - // set flags - cpu_wf(ctx, F_Z | F_N | F_H | F_C, ( - (n ? 0 : F_Z) | - (c ? F_C : 0) - )); - } + rlc_hl(ctx); - id: RLC A hex: 0x07 cat: "8-bit rotations/shifts" @@ -7791,6 +7765,7 @@ templates: #define UNUSED(a) ((void) (a)) + #define FLAG(ctx, f) (cpu_rb(ctx, RB_F) & (F_##f)) #define F_Z (1 << 7) #define F_N (1 << 6) #define F_H (1 << 5) @@ -8091,7 +8066,7 @@ templates: // get old and new value const uint8_t o = cpu_rb(ctx, RB_A), n = cpu_rb(ctx, reg), - c = (cpu_rb(ctx, RB_F) & F_C) ? 1 : 0; + c = FLAG(ctx, C) ? 1 : 0; const uint16_t v = o + n + c; // write value @@ -8128,6 +8103,28 @@ templates: } static void + sub_d8( + gb_t * const ctx, + const uint16_t addr + ) { + // get old and new value + const uint8_t o = cpu_rb(ctx, RB_A), + n = mmu_rb(ctx, addr), + v = o - n; + + // write value + cpu_wb(ctx, RB_A, v); + + // set flags + cpu_wf(ctx, F_Z | F_N | F_H | F_C, ( + (v ? 0 : F_Z) | + F_N | + ((((o & 0x0F) - (n & 0x0F)) & 0xF0) ? F_H : 0) | + ((n > o) ? F_C : 0) + )); + } + + static void sbc_rb( gb_t * const ctx, const rb_t reg @@ -8135,7 +8132,7 @@ templates: // get old and new value const uint8_t o = cpu_rb(ctx, RB_A), n = cpu_rb(ctx, reg), - c = (cpu_rb(ctx, RB_F) & F_C) ? 1 : 0, + c = FLAG(ctx, C) ? 1 : 0, v = o - (n + c); // write value @@ -8269,6 +8266,25 @@ templates: } static void + rlc_hl( + gb_t * const ctx + ) { + // get old value, carry bit, and new value + const uint16_t addr = cpu_rw(ctx, RW_HL); + const uint8_t o = mmu_rb(ctx, addr), + c = (o & 0x80) ? 1 : 0, + n = ((o & 0x7F) << 1) + c; + // set value + mmu_wb(ctx, addr, n); + + // set flags + cpu_wf(ctx, F_Z | F_N | F_H | F_C, ( + (n ? 0 : F_Z) | + (c ? F_C : 0) + )); + } + + static void rrc_rb( gb_t * const ctx, const rb_t reg @@ -8294,7 +8310,7 @@ templates: ) { // get old value and new value const uint8_t o = cpu_rb(ctx, reg), - n = (o << 1) + (cpu_rb(ctx, RB_F) & F_C ? 1 : 0); + n = (o << 1) + (FLAG(ctx, C) ? 1 : 0); // set value cpu_wb(ctx, reg, n); @@ -8312,7 +8328,7 @@ templates: ) { // get old value and new value const uint8_t o = cpu_rb(ctx, reg), - n = (cpu_rb(ctx, RB_F) & F_C ? 0x80 : 0) | (o >> 1); + n = (FLAG(ctx, C) ? 0x80 : 0) | (o >> 1); // set value cpu_wb(ctx, reg, n); @@ -8411,7 +8427,6 @@ templates: )); } - static void set_rb( gb_t * const ctx, @@ -8485,478 +8500,3 @@ templates: not_implemented(ctx, old_pc, op); } } - - sla_r8: | - let b = ctx.cpu.r.<%= dst.downcase %>, - c = (b & 0x80), - v = (b << 1) & 0xFF; - - ctx.cpu.r.f = ( - (v ? 0 : 0x80) | - (c ? 0x10 : 0) - ); - ctx.cpu.r.<%= dst.downcase %> = v; - - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - sla_rp16: | - let addr = ( - ((ctx.cpu.r.<%= dst.downcase[1] %> & 0xFF) << 8) + - (ctx.cpu.r.<%= dst.downcase[2] %> & 0xFF) - ), - b = ctx.mmu.rb(addr), - c = (b & 0x80), - v = (b << 1) & 0xFF; - - ctx.cpu.r.f = ( - (v ? 0 : 0x80) | - (c ? 0x10 : 0) - ); - ctx.mmu.wb(addr, v); - - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - sra_r8: | - let b = ctx.cpu.r.<%= dst.downcase %>, - c = (b & 0x01), - v = ((b & 0x80) | (b >> 1)) & 0xFF; - - ctx.cpu.r.f = ( - (v ? 0 : 0x80) | - (c ? 0x10 : 0) - ); - ctx.cpu.r.<%= dst.downcase %> = v; - - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - sra_rp16: | - let addr = ( - ((ctx.cpu.r.<%= dst.downcase[1] %> & 0xFF) << 8) + - (ctx.cpu.r.<%= dst.downcase[2] %> & 0xFF) - ), - b = ctx.mmu.rb(addr), - c = (b & 0x01), - v = ((b & 0x80) | (b >> 1)) & 0xFF; - - ctx.cpu.r.f = ( - (v ? 0 : 0x80) | - (c ? 0x10 : 0) - ); - ctx.mmu.wb(addr, v); - - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - srl_r8: | - let b = ctx.cpu.r.<%= dst.downcase %>, - c = (b & 0x01), - v = (b >> 1) & 0x7F; - - ctx.cpu.r.f = ( - (v ? 0 : 0x80) | - (c ? 0x10 : 0) - ); - ctx.cpu.r.<%= dst.downcase %> = v; - - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - srl_rp16: | - let addr = ( - ((ctx.cpu.r.<%= dst.downcase[1] %> & 0xFF) << 8) + - (ctx.cpu.r.<%= dst.downcase[2] %> & 0xFF) - ), - b = ctx.mmu.rb(addr), - c = (b & 0x01), - v = (b >> 1) & 0x7F; - - ctx.cpu.r.f = ( - (v ? 0 : 0x80) | - (c ? 0x10 : 0) - ); - ctx.mmu.wb(addr, v); - - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - swap_r8: | - let b = ctx.cpu.r.<%= dst.downcase %>, - v = ((b & 0x0F) << 4) | (b >> 4); - - ctx.cpu.r.f = ( - (v ? 0 : 0x80); - ); - ctx.cpu.r.<%= dst.downcase %> = v; - - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - swap_rp16: | - let addr = ( - ((ctx.cpu.r.<%= dst.downcase[1] %> & 0xFF) << 8) + - (ctx.cpu.r.<%= dst.downcase[2] %> & 0xFF) - ), - b = ctx.mmu.rb(addr), - v = ((b & 0x0F) << 4) | (b >> 4); - - ctx.cpu.r.f = ( - (v ? 0 : 0x80) | - ); - ctx.mmu.wb(addr, v); - - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - cp_r8: | - let v = ( - ctx.cpu.r.<%= dst.downcase %> - - ctx.cpu.r.<%= src.downcase %> - ), hc = ( - // FIXME: probably wrong - (ctx.cpu.r.<%= dst.downcase %> & 0xF) < - (v & 0xF) - ); - - ctx.cpu.r.f = ( - ((v & 0xFF) ? 0 : 0x80) | - 0x40 | - (hc ? 0x20 : 0) | - ((v < 0) ? 0 : 0x10) - ) 0xFF; - - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - cp_d8: | - let v = ( - ctx.cpu.r.<%= dst.downcase %> - - ctx.mmu.rb(ctx.cpu.r.pc + 1) - ), hc = ( - // FIXME: probably wrong - (ctx.cpu.r.<%= dst.downcase %> & 0xF) < - (v & 0xF) - ); - - ctx.cpu.r.f = ( - ((v & 0xFF) ? 0 : 0x80) | - 0x40 | - (hc ? 0x20 : 0) | - ((v < 0) ? 0 : 0x10) - ) 0xFF; - - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - cp_rp16: | - let v = ( - ctx.cpu.r.<%= dst.downcase %> - - ctx.mmu.rb( - ((ctx.cpu.r.<%= src.downcase[1] %> & 0xFF) << 8) + - (ctx.cpu.r.<%= src.downcase[2] %> & 0xFF) - ) - ), hc = ( - // FIXME: probably wrong - (ctx.cpu.r.<%= dst.downcase %> & 0xF) < - (v & 0xF) - ); - - ctx.cpu.r.f = ( - ((v & 0xFF) ? 0 : 0x80) | - 0x40 | - (hc ? 0x20 : 0) | - ((v < 0) ? 0 : 0x10) - ) 0xFF; - - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - nop: | - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - halt: | - ctx.cpu.r.halt = true; - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - stop: | - ctx.cpu.r.stop = true; - // ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - rst: | - // increment pc - // FIXME: is this correct before sp push? - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - - // push pc - ctx.cpu.r.sp = (ctx.cpu.r.sp - 2) & 0xFFFF; - ctx.mmu.ww(ctx.cpu.r.sp, ctx.cpu.r.pc); - - // set pc - ctx.cpu.r.pc = <%= addr %>; - t += <%= time %>; - - push: | - // push hi - ctx.cpu.r.sp = (ctx.cpu.r.sp - 1) & 0xFFFF; - ctx.mmu.wb(ctx.cpu.r.sp, ctx.cpu.r.<%= src.downcase[0] %>); - - // push lo - ctx.cpu.r.sp = (ctx.cpu.r.sp - 1) & 0xFFFF; - ctx.mmu.wb(ctx.cpu.r.sp, ctx.cpu.r.<%= src.downcase[1] %>); - - // set pc - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - pop: | - // pop lo - ctx.cpu.r.<%= dst.downcase[1] %> = ctx.mmu.rb(ctx.cpu.r.sp) & 0xFF; - ctx.cpu.r.sp = (ctx.cpu.r.sp + 1) & 0xFFFF; - - // pop hi - ctx.cpu.r.<%= dst.downcase[0] %> = ctx.mmu.rb(ctx.cpu.r.sp) & 0xFF; - ctx.cpu.r.sp = (ctx.cpu.r.sp + 1) & 0xFFFF; - - // set pc - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - cond_Z: | - ctx.cpu.r.f & 0x80 - - cond_NZ: | - !(ctx.cpu.r.f ^ 0x80) - - cond_C: | - ctx.cpu.r.f & 0x10 - - cond_NC: | - !(ctx.cpu.r.f & 0x10) - - jp_addr: | - ( - (ctx.cpu.r.<%= src.downcase[1] %> & 0xFF) << 8 | - (ctx.cpu.r.<%= src.downcase[2] %> & 0xFF) - ) - - jp_test: | - if (<%= cond %>) { - ctx.cpu.r.pc = ctx.mmu.rw(<%= addr %>) & 0xFFFF; - t += <%= time['t'] %>; - } else { - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time['f'] %>; - } - - jp: | - ctx.cpu.r.pc = ctx.mmu.rw(<%= addr %>) & 0xFFFF; - t += <%= time %>; - - jr_test: | - if (<%= cond %>) { - // treat byte as signed offset - let byte = ctx.mmu.rb(ctx.cpu.pc + 1), - ofs = (byte & 0x08) ? -((~byte + 1) & 0xFF) : byte; - - ctx.cpu.r.pc = (ctx.cpu.r.pc + ofs) & 0xFFFF; - t += <%= time['t'] %>; - } else { - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time['f'] %>; - } - - jr: | - // treat byte as signed offset - let byte = ctx.mmu.rb(ctx.cpu.pc + 1), - ofs = (byte & 0x08) ? -((~byte + 1) & 0xFF) : byte; - - ctx.cpu.r.pc = (ctx.cpu.r.pc + ofs) & 0xFFFF; - t += <%= time %>; - - call_test: | - // calc next instruction - let next_inst = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - - if (<%= cond %>) { - // calc addr - let addr = ( - ((ctx.mmu.rb(ctx.cpu.r.pc + 1) & 0xFF) << 8) & | - (ctx.mmu.rb(ctx.cpu.r.pc + 2) & 0xFF) - ); - - // push hi pc byte - ctx.cpu.r.sp = (ctx.cpu.r.sp - 1) & 0xFFFF; - ctx.mmu.wb(ctx.cpu.r.sp, (next_inst >> 8) & 0xFF); - - // push lo pc byte - ctx.cpu.r.sp = (ctx.cpu.r.sp - 1) & 0xFFFF; - ctx.mmu.wb(ctx.cpu.r.sp, next_inst & 0xFF); - - // set pc, inc time - ctx.cpu.r.pc = addr; - t += <%= time['t'] %>; - } else { - // set pc, inc time - ctx.cpu.r.pc = next_inst; - t += <%= time['f'] %>; - } - - call: | - // calc next instruction - let next_inst = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - - // calc addr - let addr = ( - ((ctx.mmu.rb(ctx.cpu.r.pc + 1) & 0xFF) << 8) & | - (ctx.mmu.rb(ctx.cpu.r.pc + 2) & 0xFF) - ); - - // push hi pc byte - ctx.cpu.r.sp = (ctx.cpu.r.sp - 1) & 0xFFFF; - ctx.mmu.wb(ctx.cpu.r.sp, (next_inst >> 8) & 0xFF); - - // push lo pc byte - ctx.cpu.r.sp = (ctx.cpu.r.sp - 1) & 0xFFFF; - ctx.mmu.wb(ctx.cpu.r.sp, next_inst & 0xFF); - - // set pc, inc time - ctx.cpu.r.pc = addr; - t += <%= time %>; - - ret_test: | - if (<%= cond %>) { - // pop lo - let lo = ctx.mmu.rb(ctx.cpu.r.sp); - ctx.cpu.r.sp = (ctx.cpu.r.sp + 1) & 0xFFFF; - - // pop hi - let hi = ctx.mmu.rb(ctx.cpu.r.sp); - ctx.cpu.r.sp = (ctx.cpu.r.sp + 1) & 0xFFFF; - - // set pc, inc time - ctx.cpu.r.pc = ((hi & 0xFF) << 8) | (lo & 0xFF); - t += <%= time['t'] %>; - } else { - // set pc, inc time - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time['f'] %>; - } - - ret: | - // pop lo - let lo = ctx.mmu.rb(ctx.cpu.r.sp); - ctx.cpu.r.sp = (ctx.cpu.r.sp + 1) & 0xFFFF; - - // pop hi - let hi = ctx.mmu.rb(ctx.cpu.r.sp); - ctx.cpu.r.sp = (ctx.cpu.r.sp + 1) & 0xFFFF; - - // set pc, inc time - ctx.cpu.r.pc = ((hi & 0xFF) << 8) | (lo & 0xFF); - t += <%= time %>; - - reti: | - // enable interrupts - ctx.cpu.r.i = true; - - /// rest is ret - - ei: | - // enable interrupts - ctx.cpu.r.i = true; - - // set pc, inc time - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - di: | - // disable interrupts - ctx.cpu.r.i = false; - - // set pc, inc time - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - scf: | - ctx.cpu.r.f = ( - (ctx.cpu.r.f & 0x80) | - 0x10 - ); - - // set pc, inc time - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - ccf: | - ctx.cpu.r.f = ( - (ctx.cpu.r.f & 0x80) | - (ctx.cpu.r.f & 0x10 ? 0 : 0x10) - ); - - // set pc, inc time - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - cpl: | - // complement a - ctx.cpu.r.a = (~ctx.cpu.r.a) & 0xFF; - - // set flags - ctx.cpu.r.f = ( - (ctx.cpu.r.f & 0x80) | - 0x40 | - 0x20 | - (ctx.cpu.r.f & 0x10) - ); - - // set pc, inc time - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - ldh_a_a8: | - ctx.cpu.r.a = ctx.mmu.rb(0xFF00 | ctx.mmu.rb(ctx.cpu.r.pc + 1)); - - // set pc, inc time - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - ldh_a8_a: | - ctx.mmu.wb(0xFF00 | ctx.mmu.rb(ctx.cpu.r.pc + 1), ctx.cpu.r.a); - - // set pc, inc time - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; - - daa: | - // from http://datasheets.chipdb.org/Zilog/Z80/z80-documented-0.90.pdf - // and http://forums.nesdev.com/viewtopic.php?t=9088 - let v = ctx.cpu.r.a; - let ofs = ( - (((ctx.cpu.r.f & 0x10) || ((ctx.cpu.r.a >> 4) > 9)) ? 0x60 : 0) + - (((ctx.cpu.r.f & 0x20) || ((ctx.cpu.r.a & 0xF) > 9)) ? 0x06 : 0) - ); - - if (ctx.cpu.r.f & 0x40) { - v -= ofs; - } else { - v += ofs; - } - - // set flags - ctx.cpu.r.f = ( - (v & 0xFF ? 0 : 0x80) | - (ctx.cpu.r.f & 0x40) | - (cf ? 0x10 : 0) - ); - - // update a - ctx.cpu.r.a = v & 0xFF; - - // set pc, inc time - ctx.cpu.r.pc = (ctx.cpu.r.pc + <%= len %>) & 0xFFFF; - t += <%= time %>; |