Fix FRO detection

core/vb.c

@@ -65,16 +65,21 @@ struct VB {
 
         /* Working data */
         union {
+            struct {
+                uint32_t dest;
+                uint64_t src;
+            } bs;   /* Arithmetic bit strings */
             struct {
                 uint32_t address;
                 int32_t  value;
-            } data;
+            } data; /* Data accesses */
         } aux;
 
         /* Other state */
         uint32_t clocks;    /* Master clocks to wait */
         uint16_t code[2];   /* Instruction code units */
         uint16_t exception; /* Exception cause code */
+        int      halt;      /* CPU is halting */
         uint16_t irq;       /* Interrupt request lines */
         int      length;    /* Instruction code length */
         uint32_t nextPC;    /* Address of next instruction */
@@ -86,6 +91,7 @@ struct VB {
     uint8_t wram[0x10000]; /* System RAM */
 
     /* Application data */
+    vbOnException onException; /* CPU exception */
     vbOnExecute   onExecute;   /* CPU instruction execute */
     vbOnFetch     onFetch;     /* CPU instruction fetch */
     vbOnRead      onRead;      /* CPU instruction read */
@@ -185,6 +191,11 @@ VBAPI void* vbGetCartROM(VB *sim, uint32_t *size) {
     return sim->cart.rom;
 }
 
+/* Retrieve the exception callback handle */
+VBAPI vbOnException vbGetExceptionCallback(VB *sim) {
+    return sim->onException;
+}
+
 /* Retrieve the execute callback handle */
 VBAPI vbOnExecute vbGetExecuteCallback(VB *sim) {
     return sim->onExecute;
@@ -256,6 +267,7 @@ VBAPI VB* vbReset(VB *sim) {
 
     /* CPU (normal) */
     sim->cpu.exception = 0;
+    sim->cpu.halt      = 0;
     sim->cpu.irq       = 0;
     sim->cpu.pc        = 0xFFFFFFF0;
     cpuSetSystemRegister(sim, VB_ECR, 0x0000FFF0, 1);
@@ -304,6 +316,13 @@ VBAPI int vbSetCartROM(VB *sim, void *rom, uint32_t size) {
     return 0;
 }
 
+/* Specify a new exception callback handle */
+VBAPI vbOnException vbSetExceptionCallback(VB *sim, vbOnException callback) {
+    vbOnException prev = sim->onException;
+    sim->onException = callback;
+    return prev;
+}
+
 /* Specify a new execute callback handle */
 VBAPI vbOnExecute vbSetExecuteCallback(VB *sim, vbOnExecute callback) {
     vbOnExecute prev = sim->onExecute;

core/vb.h

@@ -52,6 +52,7 @@ extern "C" {
 typedef struct VB VB;
 
 /* Callbacks */
+typedef int (*vbOnException)(VB *sim, uint16_t *cause);
 typedef int (*vbOnExecute  )(VB *sim, uint32_t address, const uint16_t *code, int length);
 typedef int (*vbOnFetch    )(VB *sim, int fetch, uint32_t address, int32_t *value, uint32_t *cycles);
 typedef int (*vbOnRead     )(VB *sim, uint32_t address, int type, int32_t *value, uint32_t *cycles);
@@ -67,6 +68,7 @@ VBAPI int         vbEmulateEx         (VB **sims, int count, uint32_t *clocks);
 VBAPI void*         vbGetCallback         (VB *sim, int id);
 VBAPI void*         vbGetCartRAM          (VB *sim, uint32_t *size);
 VBAPI void*         vbGetCartROM          (VB *sim, uint32_t *size);
+VBAPI vbOnException vbGetExceptionCallback(VB *sim);
 VBAPI vbOnExecute   vbGetExecuteCallback  (VB *sim);
 VBAPI vbOnFetch     vbGetFetchCallback    (VB *sim);
 VBAPI uint32_t      vbGetProgramCounter   (VB *sim);
@@ -80,6 +82,7 @@ VBAPI int32_t     vbRead              (VB *sim, uint32_t address, int type);
 VBAPI VB*           vbReset               (VB *sim);
 VBAPI int           vbSetCartRAM          (VB *sim, void *sram, uint32_t size);
 VBAPI int           vbSetCartROM          (VB *sim, void *rom, uint32_t size);
+VBAPI vbOnException vbSetExceptionCallback(VB *sim, vbOnException callback);
 VBAPI vbOnExecute   vbSetExecuteCallback  (VB *sim, vbOnExecute callback);
 VBAPI vbOnFetch     vbSetFetchCallback    (VB *sim, vbOnFetch callback);
 VBAPI uint32_t      vbSetProgramCounter   (VB *sim, uint32_t value);