35 lines
1.2 KiB
C
35 lines
1.2 KiB
C
#include <cpu.h>
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#include <instructions/instructions.h>
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void instruction_mov_r_r(cpu_status_t* status) {
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status->r[LO_NIBBLE(cpu_read8(status,status->pc))] = status->r[HI_NIBBLE(cpu_read8(status,status->pc+1))];
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status->pc += 2;
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}
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void instruction_mov_imm_r(cpu_status_t* status){
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if ((cpu_read8(status,status->pc+1) & 0x80) == 0)
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status->r[LO_NIBBLE(cpu_read8(status,status->pc))] = (0x000000FF & cpu_read8(status,status->pc+1));
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else
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status->r[LO_NIBBLE(cpu_read8(status,status->pc))] = (0xFFFFFF00 | cpu_read8(status,status->pc+1));
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status->pc += 2;
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}
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void instruction_movt_r(cpu_status_t* status){
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if (status->t == 1)
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status->r[LO_NIBBLE(cpu_read8(status,status->pc))] = 0x00000001;
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else
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status->r[LO_NIBBLE(cpu_read8(status,status->pc))] = 0x00000000;
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status->pc += 2;
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}
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void instruction_swapb_r_r(cpu_status_t* status){
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int n = status->r[LO_NIBBLE(cpu_read8(status,status->pc))];
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int m = status->r[HI_NIBBLE(cpu_read8(status,status->pc+1))];
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unsigned long temp0, temp1;
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temp0 = status->r[m] & 0xFFFF0000;
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temp1 = (status->r[m] & 0x000000FF) << 8;
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status->r[n] = (status->r[m] & 0x0000FF00) >> 8;
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status->r[n] = status->r[n] | temp1 | temp0;
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status->pc += 2;
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} |