82 lines
3.1 KiB
C
82 lines
3.1 KiB
C
#include <cpu.h>
|
|
#include <instructions/instructions.h>
|
|
|
|
void instruction_movb_ar_r(cpu_status_t* status){
|
|
status->r[LO_NIBBLE(cpu_read8(status,status->pc))] = cpu_read8(status,status->r[HI_NIBBLE(cpu_read8(status,status->pc+1))]);
|
|
if ((status->r[LO_NIBBLE(cpu_read8(status,status->pc))] & 0x80) == 0)
|
|
status->r[LO_NIBBLE(cpu_read8(status,status->pc))] &= 0x000000FF;
|
|
else
|
|
status->r[LO_NIBBLE(cpu_read8(status,status->pc))] |= 0xFFFFFF00;
|
|
|
|
status->pc += 2;
|
|
}
|
|
|
|
void instruction_movb_r_ar(cpu_status_t* status){
|
|
cpu_write8(status, status->r[LO_NIBBLE(cpu_read8(status,status->pc))], status->r[HI_NIBBLE(cpu_read8(status,status->pc+1))]);
|
|
status->pc += 2;
|
|
}
|
|
|
|
void instruction_movb_arp_r(cpu_status_t* status){
|
|
status->r[LO_NIBBLE(cpu_read8(status,status->pc))] = cpu_read8(status, status->r[HI_NIBBLE(cpu_read8(status,status->pc+1))]);
|
|
if ((status->r[LO_NIBBLE(cpu_read8(status,status->pc))] & 0x80) == 0)
|
|
status->r[LO_NIBBLE(cpu_read8(status,status->pc))] &= 0x000000FF;
|
|
else
|
|
status->r[LO_NIBBLE(cpu_read8(status,status->pc))] |= 0xFFFFFF00;
|
|
|
|
if (LO_NIBBLE(cpu_read8(status,status->pc)) != HI_NIBBLE(cpu_read8(status,status->pc+1)))
|
|
status->r[HI_NIBBLE(cpu_read8(status,status->pc+1))] += 1;
|
|
|
|
status->pc += 2;
|
|
}
|
|
|
|
void instruction_movb_r_amr(cpu_status_t* status){
|
|
cpu_write8(status, status->r[LO_NIBBLE(cpu_read8(status,status->pc))] - 1, status->r[HI_NIBBLE(cpu_read8(status,status->pc+1))]);
|
|
status->r[LO_NIBBLE(cpu_read8(status,status->pc))] -= 1;
|
|
status->pc += 2;
|
|
}
|
|
|
|
void instruction_movb_disp_r_r0(cpu_status_t* status){
|
|
long disp = (0x0000000F & (long)LO_NIBBLE(cpu_read8(status,status->pc+1)));
|
|
status->r[0] = cpu_read8(status, status->r[HI_NIBBLE(cpu_read8(status,status->pc+1))] + disp);
|
|
|
|
if ((status->r[0] & 0x80) == 0)
|
|
status->r[0] &= 0x000000FF;
|
|
else
|
|
status->r[0] |= 0xFFFFFF00;
|
|
|
|
status->pc += 2;
|
|
}
|
|
|
|
void instruction_movb_r0_r_r(cpu_status_t* status){
|
|
status->r[LO_NIBBLE(cpu_read8(status,status->pc))] = cpu_read8(status, status->r[HI_NIBBLE(cpu_read8(status,status->pc+1))] + status->r[0]);
|
|
|
|
if ((status->r[LO_NIBBLE(cpu_read8(status,status->pc))] & 0x80) == 0)
|
|
status->r[LO_NIBBLE(cpu_read8(status,status->pc))] &= 0x000000FF;
|
|
else status->r[LO_NIBBLE(cpu_read8(status,status->pc))] |= 0xFFFFFF00;
|
|
|
|
status->pc += 2;
|
|
}
|
|
|
|
void instruction_movb_r_r0_r(cpu_status_t* status){
|
|
cpu_write8(status, status->r[LO_NIBBLE(cpu_read8(status,status->pc))] + status->r[0], status->r[HI_NIBBLE(cpu_read8(status,status->pc+1))]);
|
|
status->pc += 2;
|
|
}
|
|
|
|
void instruction_movb_disp_gbr_r0(cpu_status_t* status){
|
|
unsigned int disp = (0x000000FF & cpu_read8(status,status->pc+1));
|
|
status->r[0] = cpu_read8(status, status->gbr + disp);
|
|
|
|
if ((status->r[0] & 0x80) == 0)
|
|
status->r[0] &= 0x000000FF;
|
|
else
|
|
status->r[0] |= 0xFFFFFF00;
|
|
|
|
status->pc += 2;
|
|
}
|
|
|
|
void instruction_movb_r0_disp_r(cpu_status_t* status){
|
|
int d = LO_NIBBLE(cpu_read8(status,status->pc+1));
|
|
long disp = (0x0000000F & (long)d);
|
|
cpu_write8(status, status->r[HI_NIBBLE(cpu_read8(status,status->pc+1))] + disp, status->r[0]);
|
|
status->pc += 2;
|
|
} |