GuyPerfect/pvbemu
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pvbemu
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Tweaks from concurrent project

This commit is contained in:
Guy Perfect 2021-09-30 17:33:55 +00:00
parent a7985bad6e
commit fccb799a9c
4 changed files with 61 additions and 18 deletions
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34
core/cpu.c
View File

@ -202,7 +202,8 @@ static int cpuWrite(VB *emu, uint32_t address, int8_t type, int32_t value) {
/* Using a breakpoint callback */
if (emu->onWrite != NULL) {
emu->cpu.access.value = value;
emu->cpu.access.address = address;
emu->cpu.access.value = value;
if (emu->onWrite(emu, &emu->cpu.access))
return 1;
}
@ -234,7 +235,7 @@ static int cpuBitSearch(VB *emu, int32_t bit, int32_t dir) {
int32_t value; /* Alias of source word */
/* Read the source word */
if (!emu->cpu.busWait) {
if (emu->cpu.busWait == 0) {
/* Initialize state */
emu->cpu.program[30] &= 0xFFFFFFFC;
@ -600,7 +601,7 @@ static void cpuJump(VB *emu, VB_INSTRUCTION *inst, uint32_t address) {
static int cpuLoad(VB *emu,VB_INSTRUCTION *inst,uint8_t type,uint32_t clocks) {
/* Initiate the read */
if (!emu->cpu.busWait) {
if (emu->cpu.busWait == 0) {
/* Read the data unit from the bus */
if (cpuRead(
@ -688,7 +689,7 @@ static int cpuShiftRight(VB *emu, int32_t value, int bits, int arithmetic) {
static int cpuStore(VB *emu,VB_INSTRUCTION *inst,uint8_t type,uint32_t clocks){
/* Initiate the write */
if (!emu->cpu.busWait) {
if (emu->cpu.busWait == 0) {
/* Read the data unit from the bus */
if (cpuWrite(
@ -1000,9 +1001,8 @@ static void cpuDIVU(VB *emu, VB_INSTRUCTION *inst) {
}
/* Halt */
static void cpuHALT(VB *emu, VB_INSTRUCTION *inst) {
static void cpuHALT(VB *emu) {
emu->cpu.state = CPU_HALTED;
inst->size = 0;
/* emu->cpu.clocks = ? */
}
@ -1413,16 +1413,14 @@ static int cpuExecute(VB *emu) {
return 0;
}
/* Working variables */
inst = &emu->cpu.inst;
/* Prepare state */
emu->cpu.causeCode = 0;
inst = &emu->cpu.inst;
/* Check for application break */
if (emu->onExecute != NULL && emu->onExecute(emu, inst))
return 1;
/* Update state */
emu->cpu.causeCode = 0;
/* Processing by ID */
broke = 0;
switch (inst->id) {
@ -1445,7 +1443,7 @@ static int cpuExecute(VB *emu) {
case CPU_DIV : cpuDIV (emu, inst); break;
case CPU_DIVF_S : cpuDIVF_S (emu, inst); break;
case CPU_DIVU : cpuDIVU (emu, inst); break;
case CPU_HALT : cpuHALT (emu, inst); break;
case CPU_HALT : cpuHALT (emu ); break;
case CPU_IN_B : broke = cpuIN_B (emu, inst); break;
case CPU_IN_H : broke = cpuIN_H (emu, inst); break;
case CPU_IN_W : broke = cpuIN_W (emu, inst); break;
@ -1513,7 +1511,7 @@ static int cpuExecute(VB *emu) {
return 1;
/* Post-instruction tasks */
if (emu->cpu.causeCode == 0 && !emu->cpu.busWait) {
if (emu->cpu.causeCode == 0 && emu->cpu.busWait == 0) {
/* Advance to next instruction */
if (emu->cpu.state != CPU_HALTED && !emu->cpu.substring)
@ -1531,7 +1529,7 @@ static int cpuExecute(VB *emu) {
/* Switch to fetch mode */
else if (emu->cpu.state != CPU_HALTED &&
!emu->cpu.busWait && !emu->cpu.substring) {
emu->cpu.busWait == 0 && !emu->cpu.substring) {
emu->cpu.state = CPU_FETCH;
}
@ -1642,7 +1640,7 @@ static int cpuFetch(VB *emu) {
uint8_t opcode; /* 6-bit instruction opcode */
/* Need to read a data unit */
if (!emu->cpu.busWait) {
if (emu->cpu.busWait == 0) {
/* Read the data unit from the bus */
if (cpuReadFetch(emu, emu->cpu.pc + (emu->cpu.fetch << 1)))
@ -1741,6 +1739,9 @@ static void cpuReset(VB *emu) {
/* Other state */
emu->cpu.busWait = 0;
emu->cpu.causeCode = 0;
emu->cpu.clocks = 0;
emu->cpu.fetch = 0;
emu->cpu.state = CPU_FETCH;
emu->cpu.substring = 0;
for (x = 0; x < 5; x++)
@ -1775,6 +1776,7 @@ static uint32_t cpuUntil(VB *emu, uint32_t clocks) {
emu->cpu.state == CPU_FATAL || (
emu->onException == NULL &&
emu->onExecute == NULL &&
emu->onFetch == NULL &&
emu->onRead == NULL &&
emu->onWrite == NULL
)) return clocks;
@ -1785,4 +1787,4 @@ static uint32_t cpuUntil(VB *emu, uint32_t clocks) {
#endif /* VBAPI */
#endif /* WSAPI */

32
core/vb.c
View File

@ -98,6 +98,22 @@ int vbEmulate(VB *emu1, VB *emu2, uint32_t *clocks) {
return broke;
}
/* Retrieve a current breakpoint callback */
void* vbGetCallback(VB *emu, int type) {
/* -Wpedantic ignored for pointer conversion because no alternative */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
switch (type) {
case VB_ONEXCEPTION: return emu->onException;
case VB_ONEXECUTE : return emu->onExecute;
case VB_ONFETCH : return emu->onFetch;
case VB_ONREAD : return emu->onRead;
case VB_ONWRITE : return emu->onWrite;
}
#pragma GCC diagnostic pop
return NULL;
}
/* Retrieve the value of PC */
uint32_t vbGetProgramCounter(VB *emu, int type) {
switch (type) {
@ -205,9 +221,25 @@ void vbReset(VB *emu) {
emu->wram[x] = 0x00;
}
/* Specify a breakpoint callback */
void vbSetCallback(VB *emu, int type, void *callback) {
/* -Wpedantic ignored for pointer conversion because no alternative */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
switch (type) {
case VB_ONEXCEPTION: emu->onException=(VB_EXCEPTIONPROC)callback;break;
case VB_ONEXECUTE : emu->onExecute =(VB_EXECUTEPROC )callback;break;
case VB_ONFETCH : emu->onFetch =(VB_FETCHPROC )callback;break;
case VB_ONREAD : emu->onRead =(VB_READPROC )callback;break;
case VB_ONWRITE : emu->onWrite =(VB_WRITEPROC )callback;break;
}
#pragma GCC diagnostic pop
}
/* Specify a new value for PC */
uint32_t vbSetProgramCounter(VB *emu, uint32_t value) {
value &= 0xFFFFFFFE;
emu->cpu.causeCode = 0;
emu->cpu.fetch = 0;
emu->cpu.pc = value;
emu->cpu.state = CPU_FETCH;

11
core/vb.h
View File

@ -42,6 +42,13 @@ extern "C" {
#define VB_PC_FROM 1
#define VB_PC_TO 2
/* Breakpoint callback types */
#define VB_ONEXCEPTION 0
#define VB_ONEXECUTE 1
#define VB_ONFETCH 2
#define VB_ONREAD 3
#define VB_ONWRITE 4
/*********************************** Types ***********************************/
@ -146,7 +153,7 @@ struct VB {
VB_ACCESS access; /* Memory access descriptor */
VB_INSTRUCTION inst; /* Instruction descriptor */
uint8_t irq[5]; /* Interrupt request lines */
uint8_t busWait; /* Waiting on a memory access */
uint8_t busWait; /* Memory access counter */
uint16_t causeCode; /* Exception cause code */
uint32_t clocks; /* Clocks until next action */
int16_t fetch; /* Index of fetch unit */
@ -173,6 +180,7 @@ struct VB {
VBAPI void vbConnect (VB *emu1, VB *emu2);
VBAPI void vbDisconnect (VB *emu);
VBAPI int vbEmulate (VB *emu1, VB *emu2, uint32_t *clocks);
VBAPI void* vbGetCallback (VB *emu, int type);
VBAPI uint32_t vbGetProgramCounter (VB *emu, int type);
VBAPI int32_t vbGetProgramRegister (VB *emu, int id);
VBAPI void* vbGetROM (VB *emu, uint32_t *size);
@ -181,6 +189,7 @@ VBAPI uint32_t vbGetSystemRegister (VB *emu, int id);
VBAPI void vbInit (VB *emu);
VBAPI int32_t vbRead (VB *emu, uint32_t address, int type, int debug);
VBAPI void vbReset (VB *emu);
VBAPI void vbSetCallback (VB *emu, int type, void *callback);
VBAPI uint32_t vbSetProgramCounter (VB *emu, uint32_t value);
VBAPI int32_t vbSetProgramRegister (VB *emu, int id, int32_t value);
VBAPI int vbSetROM (VB *emu, void *rom, uint32_t size);

2
makefile
View File

@ -1,7 +1,7 @@
.PHONY: help
help:
@echo
@echo "Virtual Boy Emulator - September 20, 2021"
@echo "Virtual Boy Emulator - September 30, 2021"
@echo
@echo "Target build environment is any Debian with the following packages:"
@echo " emscripten"