50 lines
928 B
C
50 lines
928 B
C
#include <cpu.h>
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#include <emu.h>
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//process CPU instructions...
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static void proc_none(cpu_context *ctx) {
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printf("INVALID INSTRUCTION!\n");
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exit(-7);
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}
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static void proc_nop(cpu_context *ctx) {
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}
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static void proc_ld(cpu_context *ctx) {
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//TODO
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}
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static bool check_condition(cpu_context *ctx) {
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bool z = CPU_FLAG_Z;
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bool c = CPU_FLAG_C;
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switch(ctx->cur_inst->cond) {
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case CT_NONE: return true;
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case CT_C: return c;
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case CT_NC: return !c;
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case CT_Z: return z;
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case CT_NZ: return !z;
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}
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return false;
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}
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static void proc_jp(cpu_context *ctx) {
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if (check_condition(ctx)) {
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ctx->regs.pc = ctx->fetched_data;
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emu_cycles(1);
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}
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}
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IN_PROC processors[] = {
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[IN_NONE] = proc_none,
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[IN_NOP] = proc_nop,
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[IN_LD] = proc_ld,
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[IN_JP] = proc_jp,
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};
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IN_PROC inst_get_processor(in_type type) {
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return processors[type];
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} |