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cpu.cpp
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cpu.cpp
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#include <stdio.h>
#include "mem.h"
#include "interrupt.h"
#include "espeon.h"
/* 16-bit mode */
#define set_HL(x) do {uint32_t macro = (x); c.L = macro&0xFF; c.H = macro>>8;} while(0)
#define set_BC(x) do {uint32_t macro = (x); c.C = macro&0xFF; c.B = macro>>8;} while(0)
#define set_DE(x) do {uint32_t macro = (x); c.E = macro&0xFF; c.D = macro>>8;} while(0)
#define set_AF(x) do {uint32_t macro = (x); c.F = macro&0xFF; c.A = macro>>8;} while(0)
#define get_AF() ((c.A<<8) | c.F)
#define get_BC() ((c.B<<8) | c.C)
#define get_DE() ((c.D<<8) | c.E)
#define get_HL() ((c.H<<8) | c.L)
/* Flags */
#define set_Z(x) c.F = ((c.F&0x7F) | ((x)<<7))
#define set_N(x) c.F = ((c.F&0xBF) | ((x)<<6))
#define set_H(x) c.F = ((c.F&0xDF) | ((x)<<5))
#define set_C(x) c.F = ((c.F&0xEF) | ((x)<<4))
#define flag_Z !!((c.F & 0x80))
#define flag_N !!((c.F & 0x40))
#define flag_H !!((c.F & 0x20))
#define flag_C !!((c.F & 0x10))
static const uint8_t opcycles[] = {
/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
1, 3, 2, 2, 1, 1, 2, 1, 5, 2, 2, 2, 1, 1, 2, 1, // 0
1, 3, 2, 2, 1, 1, 2, 1, 3, 2, 2, 2, 1, 1, 2, 1, // 1
2, 3, 2, 2, 1, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 1, // 2
2, 3, 2, 2, 3, 3, 3, 1, 2, 2, 2, 2, 1, 1, 2, 1, // 3
1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, // 4
1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, // 5
1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, // 6
2, 2, 2, 2, 2, 2, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, // 7
1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, // 8
1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, // 9
1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, // A
1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, // B
2, 3, 3, 4, 3, 4, 2, 4, 2, 4, 3, 1, 3, 6, 2, 4, // C
2, 3, 3, 0, 3, 4, 2, 4, 2, 4, 3, 0, 3, 0, 2, 4, // D
3, 3, 2, 0, 0, 4, 2, 4, 4, 1, 4, 0, 0, 0, 2, 4, // E
3, 3, 2, 1, 0, 4, 2, 4, 3, 2, 4, 1, 0, 0, 2, 4 // F
};
struct CPU {
uint8_t H, L;
uint8_t D, E;
uint8_t B, C;
uint8_t A, F;
uint16_t SP;
uint16_t PC;
uint32_t cycles;
uint32_t lastcycles;
};
static struct CPU c;
static bool halt_bug;
bool halted;
void cpu_init(void)
{
if (usebootrom) return;
set_AF(0x01B0);
set_BC(0x0013);
set_DE(0x00D8);
set_HL(0x014D);
c.SP = 0xFFFE;
c.PC = 0x0100;
}
static void RLC(uint8_t reg)
{
uint8_t t, old;
switch(reg)
{
case 0: /* B */
old = !!(c.B&0x80);
c.B = (c.B << 1) | old;
set_C(old);
set_Z(!c.B);
break;
case 1: /* C */
old = !!(c.C&0x80);
set_C(old);
c.C = c.C<<1 | old;
set_Z(!c.C);
break;
case 2: /* D */
old = !!(c.D&0x80);
set_C(old);
c.D = c.D<<1 | old;
set_Z(!c.D);
break;
case 3: /* E */
old = !!(c.E&0x80);
set_C(old);
c.E = c.E<<1 | old;
set_Z(!c.E);
break;
case 4: /* H */
old = !!(c.H&0x80);
set_C(old);
c.H = c.H<<1 | old;
set_Z(!c.H);
break;
case 5: /* L */
old = !!(c.L&0x80);
set_C(old);
c.L = c.L<<1 | old;
set_Z(!c.L);
break;
case 6: /* (HL) */
t = mem_get_byte(get_HL());
old = !!(t&0x80);
set_C(old);
t = t<<1 | old;
mem_write_byte(get_HL(), t);
set_Z(!t);
c.cycles += 2;
break;
case 7: /* A */
old = !!(c.A&0x80);
c.A = (c.A<<1) | old;
set_C(old);
set_Z(!c.A);
break;
}
set_N(0);
set_H(0);
}
static void RRC(uint8_t reg)
{
uint8_t t, old;
switch(reg)
{
case 0: /* B */
old = c.B&1;
set_C(old);
c.B = c.B>>1 | old<<7;
set_Z(!c.B);
break;
case 1: /* C */
old = c.C&1;
set_C(old);
c.C = c.C>>1 | old<<7;
set_Z(!c.C);
break;
case 2: /* D */
old = c.D&1;
set_C(old);
c.D = c.D>>1 | old<<7;
set_Z(!c.D);
break;
case 3: /* E */
old = c.E&1;
set_C(old);
c.E = c.E>>1 | old<<7;
set_Z(!c.E);
break;
case 4: /* H */
old = c.H&1;
set_C(old);
c.H = c.H>>1 | old<<7;
set_Z(!c.H);
break;
case 5: /* L */
old = c.L&1;
set_C(old);
c.L = c.L>>1 | old<<7;
set_Z(!c.L);
break;
case 6: /* (HL) */
t = mem_get_byte(get_HL());
old = t;
set_C(old);
t = t>>1 | old<<7;
mem_write_byte(get_HL(), t);
set_Z(!t);
c.cycles += 2;
break;
case 7: /* A */
old = c.A&1;
set_C(old);
c.A = c.A>>1 | old<<7;
set_Z(!c.A);
break;
}
set_N(0);
set_H(0);
}
static void RL(uint8_t reg)
{
uint8_t t, t2;
switch(reg)
{
case 0: /* B */
t2 = flag_C;
set_C(!!(c.B&0x80));
c.B = (c.B << 1) | !!(t2);
set_Z(!c.B);
break;
case 1: /* C */
t2 = flag_C;
set_C(!!(c.C&0x80));
c.C = (c.C << 1) | !!(t2);
set_Z(!c.C);
break;
case 2: /* D */
t2 = flag_C;
set_C(!!(c.D&0x80));
c.D = (c.D << 1) | !!(t2);
set_Z(!c.D);
break;
case 3: /* E */
t2 = flag_C;
set_C(!!(c.E&0x80));
c.E = (c.E << 1) | !!(t2);
set_Z(!c.E);
break;
case 4: /* H */
t2 = flag_C;
set_C(!!(c.H&0x80));
c.H = (c.H << 1) | !!(t2);
set_Z(!c.H);
break;
case 5: /* L */
t2 = flag_C;
set_C(!!(c.L&0x80));
c.L = (c.L << 1) | !!(t2);
set_Z(!c.L);
break;
case 6: /* (HL) */
t = mem_get_byte(get_HL());
t2 = flag_C;
set_C(!!(t&0x80));
t = (t << 1) | !!(t2);
mem_write_byte(get_HL(), t);
set_Z(!t);
c.cycles += 2;
break;
case 7: /* A */
t2 = flag_C;
set_C(!!(c.A&0x80));
c.A = (c.A << 1) | t2;
set_Z(!c.A);
break;
}
set_N(0);
set_H(0);
}
static void RR(uint8_t reg)
{
uint8_t t, t2;
switch(reg)
{
case 0: /* B */
t2 = flag_C;
set_C(c.B&1);
c.B = (c.B >> 1) | t2<<7;
set_Z(!c.B);
break;
case 1: /* C */
t2 = flag_C;
set_C(c.C&1);
c.C = (c.C >> 1) | t2<<7;
set_Z(!c.C);
break;
case 2: /* D */
t2 = flag_C;
set_C(c.D&1);
c.D = (c.D >> 1) | t2<<7;
set_Z(!c.D);
break;
case 3: /* E */
t2 = flag_C;
set_C(c.E&1);
c.E = (c.E >> 1) | t2<<7;
set_Z(!c.E);
break;
case 4: /* H */
t2 = flag_C;
set_C(c.H&1);
c.H = (c.H >> 1) | t2<<7;
set_Z(!c.H);
break;
case 5: /* L */
t2 = flag_C;
set_C(c.L&1);
c.L = (c.L >> 1) | t2<<7;
set_Z(!c.L);
break;
case 6: /* (HL) */
t = mem_get_byte(get_HL());
t2 = flag_C;
set_C(t&1);
t = (t >> 1) | t2<<7;
set_Z(!t);
mem_write_byte(get_HL(), t);
c.cycles += 2;
break;
case 7: /* A */
t2 = flag_C;
set_C(c.A&1);
c.A = (c.A >> 1) | (t2<<7);
set_Z(!c.A);
break;
}
set_N(0);
set_H(0);
}
static void SLA(uint8_t reg)
{
uint8_t t;
switch(reg)
{
case 0: /* B */
set_C(!!(c.B & 0x80));
c.B = c.B << 1;
set_Z(!c.B);
break;
case 1: /* C */
set_C(!!(c.C & 0x80));
c.C = c.C << 1;
set_Z(!c.C);
break;
case 2: /* D */
set_C(!!(c.D & 0x80));
c.D = c.D << 1;
set_Z(!c.D);
break;
case 3: /* E */
set_C(!!(c.E & 0x80));
c.E = c.E << 1;
set_Z(!c.E);
break;
case 4: /* H */
set_C(!!(c.H & 0x80));
c.H = c.H << 1;
set_Z(!c.H);
break;
case 5: /* L */
set_C(!!(c.L & 0x80));
c.L = c.L << 1;
set_Z(!c.L);
break;
case 6: /* (HL) */
t = mem_get_byte(get_HL());
set_C(!!(t & 0x80));
t = t << 1;
mem_write_byte(get_HL(), t);
set_Z(!t);
c.cycles += 2;
break;
case 7: /* A */
set_C(!!(c.A & 0x80));
c.A = c.A << 1;
set_Z(!c.A);
break;
}
set_H(0);
set_N(0);
}
static void SRA(uint8_t reg)
{
uint8_t old, t;
switch(reg)
{
case 0: /* B */
set_C(c.B&1);
old = c.B&0x80;
c.B = c.B >> 1 | old;
set_Z(!c.B);
break;
case 1: /* C */
set_C(c.C&1);
old = c.C&0x80;
c.C = c.C >> 1 | old;
set_Z(!c.C);
break;
case 2: /* D */
set_C(c.D&1);
old = c.D&0x80;
c.D = c.D >> 1 | old;
set_Z(!c.D);
break;
case 3: /* E */
set_C(c.E&1);
old = c.E&0x80;
c.E = c.E >> 1 | old;
set_Z(!c.E);
break;
case 4: /* H */
set_C(c.H&1);
old = c.H&0x80;
c.H = c.H >> 1 | old;
set_Z(!c.H);
break;
case 5: /* L */
set_C(c.L&1);
old = c.L&0x80;
c.L = c.L >> 1 | old;
set_Z(!c.L);
break;
case 6: /* (HL) */
t = mem_get_byte(get_HL());
set_C(t&1);
old = t&0x80;
t = t >> 1 | old;
mem_write_byte(get_HL(), t);
set_Z(!t);
c.cycles += 2;
break;
case 7: /* A */
set_C(c.A&1);
old = c.A&0x80;
c.A = c.A >> 1 | old;
set_Z(!c.A);
break;
}
set_H(0);
set_N(0);
}
static void SRL(uint8_t reg)
{
uint8_t t;
switch(reg)
{
case 0: /* B */
set_C(c.B & 1);
c.B = c.B >> 1;
set_Z(!c.B);
break;
case 1: /* C */
set_C(c.C & 1);
c.C = c.C >> 1;
set_Z(!c.C);
break;
case 2: /* D */
set_C(c.D & 1);
c.D = c.D >> 1;
set_Z(!c.D);
break;
case 3: /* E */
set_C(c.E & 1);
c.E = c.E >> 1;
set_Z(!c.E);
break;
case 4: /* H */
set_C(c.H & 1);
c.H = c.H >> 1;
set_Z(!c.H);
break;
case 5: /* L */
set_C(c.L & 1);
c.L = c.L >> 1;
set_Z(!c.L);
break;
case 6: /* (HL) */
t = mem_get_byte(get_HL());
set_C(t & 1);
t = t >> 1;
mem_write_byte(get_HL(), t);
set_Z(!t);
c.cycles += 2;
break;
case 7: /* A */
set_C(c.A & 1);
c.A = c.A >> 1;
set_Z(!c.A);
break;
}
set_H(0);
set_N(0);
}
static void SWAP(uint8_t reg)
{
uint8_t t;
switch(reg)
{
case 0: /* B */
c.B = ((c.B&0xF)<<4) | ((c.B&0xF0)>>4);
c.F = (!c.B)<<7;
break;
case 1: /* C */
c.C = ((c.C&0xF)<<4) | ((c.C&0xF0)>>4);
c.F = (!c.C)<<7;
break;
case 2: /* D */
c.D = ((c.D&0xF)<<4) | ((c.D&0xF0)>>4);
c.F = (!c.D)<<7;
break;
case 3: /* E */
c.E = ((c.E&0xF)<<4) | ((c.E&0xF0)>>4);
c.F = (!c.E)<<7;
break;
case 4: /* H */
c.H = ((c.H&0xF)<<4) | ((c.H&0xF0)>>4);
c.F = (!c.H)<<7;
break;
case 5: /* L */
c.L = ((c.L&0xF)<<4) | ((c.L&0xF0)>>4);
c.F = (!c.L)<<7;
break;
case 6: /* (HL) */
t = mem_get_byte(get_HL());
t = ((t&0xF)<<4) | ((t&0xF0)>>4);
mem_write_byte(get_HL(), t);
c.F = (!t)<<7;
c.cycles += 2;
break;
case 7: /* A */
c.A = ((c.A&0xF)<<4) | ((c.A&0xF0)>>4);
c.F = (!c.A)<<7;
break;
}
}
static void BIT_(uint8_t bit, uint8_t reg)
{
uint8_t t, f = 0 /* Make GCC happy */;
switch(reg)
{
case 0: /* B */
f = !(c.B & bit);
break;
case 1: /* C */
f = !(c.C & bit);
break;
case 2: /* D */
f = !(c.D & bit);
break;
case 3: /* E */
f = !(c.E & bit);
break;
case 4: /* H */
f = !(c.H & bit);
break;
case 5: /* L */
f = !(c.L & bit);
break;
case 6: /* (HL) */
t = mem_get_byte(get_HL());
f = !(t & bit);
c.cycles += 1;
break;
case 7: /* A */
f = !(c.A & bit);
break;
}
set_Z(f);
set_N(0);
set_H(1);
}
static void RES(uint8_t bit, uint8_t reg)
{
uint8_t t;
switch(reg)
{
case 0: /* B */
c.B &= ~bit;
break;
case 1: /* C */
c.C &= ~bit;
break;
case 2: /* D */
c.D &= ~bit;
break;
case 3: /* E */
c.E &= ~bit;
break;
case 4: /* H */
c.H &= ~bit;
break;
case 5: /* L */
c.L &= ~bit;
break;
case 6: /* (HL) */
t = mem_get_byte(get_HL());
t &= ~bit;
mem_write_byte(get_HL(), t);
c.cycles += 2;
break;
case 7: /* A */
c.A &= ~bit;
break;
}
}
static void SET(uint8_t bit, uint8_t reg)
{
uint8_t t;
switch(reg)
{
case 0: /* B */
c.B |= bit;
break;
case 1: /* C */
c.C |= bit;
break;
case 2: /* D */
c.D |= bit;
break;
case 3: /* E */
c.E |= bit;
break;
case 4: /* H */
c.H |= bit;
break;
case 5: /* L */
c.L |= bit;
break;
case 6: /* (HL) */
t = mem_get_byte(get_HL());
t |= bit;
mem_write_byte(get_HL(), t);
c.cycles += 2;
break;
case 7: /* A */
c.A |= bit;
break;
}
}
/*
00000xxx = RLC xxx
00001xxx = RRC xxx
00010xxx = RL xxx
00011xxx = RR xxx
00100xxx = SLA xxx
00101xxx = SRA xxx
00110xxx = SWAP xxx
00111xxx = SRL xxx
01yyyxxx = BIT yyy, xxx
10yyyxxx = RES yyy, xxx
11yyyxxx = SET yyy, xxx
*/
static void decode_CB(uint8_t t)
{
uint8_t reg, opcode, bit;
void (*f[])(uint8_t) = {RLC, RRC, RL, RR, SLA, SRA, SWAP, SRL};
void (*f2[])(uint8_t, uint8_t) = {BIT_, RES, SET};
reg = t&7;
opcode = t>>3;
if(opcode < 8)
{
f[opcode](reg);
return;
}
bit = opcode&7;
opcode >>= 3;
f2[opcode-1](1<<bit, reg);
c.cycles += 2;
}
void cpu_interrupt(uint16_t vector)
{
c.SP -= 2;
mem_write_word(c.SP, c.PC);
c.PC = vector;
c.cycles += 5 + halted;
halted = 0;
}
uint32_t cpu_get_cycles(void)
{
return c.cycles;
}
void cpu_print_debug(void)
{
printf("%04X: %02X\n", c.PC, mem_get_byte(c.PC));
printf("\tAF: %02X%02X, BC: %02X%02X, DE: %02X%02X, HL: %02X%02X SP: %04X, cycles %d\n",
c.A, c.F, c.B, c.C, c.D, c.E, c.H, c.L, c.SP, c.cycles);
}
/* TODO: investigate why blargg's instr_timing test is failing */
uint32_t cpu_cycle(void)
{
uint8_t b, t;
uint16_t s;
uint32_t i;
if(halted)
{
c.cycles += 1;
uint32_t delta = (c.cycles - c.lastcycles);
c.lastcycles = c.cycles;
return delta;
}
interrupt_flush();
b = mem_get_byte(c.PC);
if (halt_bug) {
halt_bug = false;
} else {
++c.PC;
}
switch(b)
{
case 0x00: /* NOP */
c.cycles += 1;
break;
case 0x01: /* LD BC, imm16 */
s = mem_get_word(c.PC);
set_BC(s);
c.PC += 2;
c.cycles += 3;
break;
case 0x02: /* LD (BC), A */
mem_write_byte(get_BC(), c.A);
c.cycles += 2;
break;
case 0x03: /* INC BC */
set_BC(get_BC()+1);
c.cycles += 2;
break;
case 0x04: /* INC B */
set_H((c.B&0xF) == 0xF);
c.B++;
set_Z(!c.B);
set_N(0);
c.cycles += 1;
break;
case 0x05: /* DEC B */
c.B--;
set_Z(!c.B);
set_N(1);
set_H((c.B & 0xF) == 0xF);
c.cycles += 1;
break;
case 0x06: /* LD B, imm8 */
c.B = mem_get_byte(c.PC++);
c.cycles += 2;
break;
case 0x07: /* RLCA */
RLC(7);
set_Z(0);
c.cycles += 1;
break;
case 0x08: /* LD (imm16), SP */
mem_write_word(mem_get_word(c.PC), c.SP);
c.PC += 2;
c.cycles += 5;
break;
case 0x09: /* ADD HL, BC */
i = get_HL() + get_BC();
set_N(0);
set_C(i >= 0x10000);
set_H((i&0xFFF) < (get_HL()&0xFFF));
set_HL(i&0xFFFF);
c.cycles += 2;
break;
case 0x0A: /* LD A, (BC) */
c.A = mem_get_byte(get_BC());
c.cycles += 2;
break;
case 0x0B: /* DEC BC */
s = get_BC();
s--;
set_BC(s);
c.cycles += 2;
break;
case 0x0C: /* INC C */
set_H((c.C&0xF) == 0xF);
c.C++;
set_Z(!c.C);
set_N(0);
c.cycles += 1;
break;
case 0x0D: /* DEC C */
set_H((c.C&0xF) == 0);
c.C--;
set_Z(!c.C);
set_N(1);
c.cycles += 1;
break;
case 0x0E: /* LD C, imm8 */
c.C = mem_get_byte(c.PC++);
c.cycles += 2;
break;
case 0x0F: /* RRCA */
RRC(7);
set_Z(0);
c.cycles += 1;
break;
case 0x10: /* STOP */
// TODO
c.PC++;
c.cycles += 1;
break;
case 0x11: /* LD DE, imm16 */
s = mem_get_word(c.PC);
set_DE(s);
c.PC += 2;
c.cycles += 3;
break;
case 0x12: /* LD (DE), A */
mem_write_byte(get_DE(), c.A);
c.cycles += 2;
break;
case 0x13: /* INC DE */
s = get_DE();
s++;
set_DE(s);
c.cycles += 2;
break;
case 0x14: /* INC D */
set_H((c.D&0xF) == 0xF);
c.D++;
set_Z(!c.D);
set_N(0);
c.cycles += 1;
break;
case 0x15: /* DEC D */
c.D--;
set_Z(!c.D);
set_N(1);
set_H((c.D & 0xF) == 0xF);
c.cycles += 1;
break;
case 0x16: /* LD D, imm8 */
c.D = mem_get_byte(c.PC++);
c.cycles += 2;
break;
case 0x17: /* RLA */
RL(7);
set_Z(0);
c.cycles += 1;
break;
case 0x18: /* JR rel8 */
c.PC += (signed char)mem_get_byte(c.PC) + 1;
c.cycles += 3;
break;
case 0x19: /* ADD HL, DE */
i = get_HL() + get_DE();
set_H((i&0xFFF) < (get_HL()&0xFFF));
set_HL(i);
set_N(0);
set_C(i > 0xFFFF);
c.cycles += 2;
break;
case 0x1A: /* LD A, (DE) */
c.A = mem_get_byte(get_DE());
c.cycles += 2;
break;
case 0x1B: /* DEC DE */
s = get_DE();
s--;
set_DE(s);
c.cycles += 2;
break;
case 0x1C: /* INC E */
set_H((c.E&0xF) == 0xF);
c.E++;
set_Z(!c.E);
set_N(0);
c.cycles += 1;
break;
case 0x1D: /* DEC E */
c.E--;
set_Z(!c.E);
set_N(1);
set_H((c.E & 0xF) == 0xF);
c.cycles += 1;
break;
case 0x1E: /* LD E, imm8 */
c.E = mem_get_byte(c.PC++);
c.cycles += 2;
break;
case 0x1F: /* RR A */
RR(7);
set_Z(0);
c.cycles += 1;
break;
case 0x20: /* JR NZ, rel8 */
if(flag_Z == 0)
{
c.PC += (signed char)mem_get_byte(c.PC) + 1;
c.cycles += 3;
} else {
c.PC += 1;
c.cycles += 2;
}
break;
case 0x21: /* LD HL, imm16 */
s = mem_get_word(c.PC);
set_HL(s);
c.PC += 2;
c.cycles += 3;
break;
case 0x22: /* LDI (HL), A */
i = get_HL();
mem_write_byte(i, c.A);
i++;
set_HL(i);
c.cycles += 2;
break;
case 0x23: /* INC HL */
s = get_HL();
s++;
set_HL(s);
c.cycles += 2;
break;
case 0x24: /* INC H */
c.H++;
set_Z(!c.H);
set_H((c.H&0xF) == 0);
set_N(0);
c.cycles += 1;
break;
case 0x25: /* DEC H */
c.H--;
set_Z(!c.H);
set_N(1);
set_H((c.H & 0xF) == 0xF);
c.cycles += 1;
break;
case 0x26: /* LD H, imm8 */
c.H = mem_get_byte(c.PC++);
c.cycles += 2;
break;
case 0x27: /* DAA */
s = c.A;
if(flag_N)
{
if(flag_H)
s = (s - 0x06)&0xFF;
if(flag_C)
s -= 0x60;
}
else
{
if(flag_H || (s & 0xF) > 9)
s += 0x06;
if(flag_C || s > 0x9F)
s += 0x60;
}
c.A = s;
set_H(0);
set_Z(!c.A);
if(s >= 0x100)
set_C(1);
c.cycles += 1;
break;
case 0x28: /* JR Z, rel8 */
if(flag_Z == 1)
{
c.PC += (signed char)mem_get_byte(c.PC) + 1;
c.cycles += 3;
} else {
c.PC += 1;
c.cycles += 2;
}
break;
case 0x29: /* ADD HL, HL */
i = get_HL()*2;
set_H((i&0x7FF) < (get_HL()&0x7FF));
set_C(i > 0xFFFF);
set_HL(i);
set_N(0);