jump and nop instructions.

lib/cpu_proc.c

@@ -0,0 +1,50 @@
+#include <cpu.h>
+#include <emu.h>
+
+//process CPU instructions...
+
+static void proc_none(cpu_context *ctx) {
+    printf("INVALID INSTRUCTION!\n");
+    exit(-7);
+}
+
+static void proc_nop(cpu_context *ctx) {
+    
+}
+
+static void proc_ld(cpu_context *ctx) {
+    //TODO
+}
+
+static bool check_condition(cpu_context *ctx) {
+    bool z = CPU_FLAG_Z;
+    bool c = CPU_FLAG_C;
+
+    switch(ctx->cur_inst->cond) {
+        case CT_NONE: return true;
+        case CT_C: return c;
+        case CT_NC: return !c;
+        case CT_Z: return z;
+        case CT_NZ: return !z;
+    }
+
+    return false;
+}
+
+static void proc_jp(cpu_context *ctx) {
+    if (check_condition(ctx)) {
+        ctx->regs.pc = ctx->fetched_data;
+        emu_cycles(1);
+    }
+}
+
+IN_PROC processors[] = {
+    [IN_NONE] = proc_none,
+    [IN_NOP] = proc_nop,
+    [IN_LD] = proc_ld,
+    [IN_JP] = proc_jp,
+};
+
+IN_PROC inst_get_processor(in_type type) {
+    return processors[type];
+}