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pvbemu/core/vb.c

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C
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#define VBAPI VB_EXPORT
/* Header includes */
#include <float.h>
#include <vb.h>
/********************************* Constants *********************************/
/* Type sizes */
static const uint8_t TYPE_SIZES[] = { 1, 1, 2, 2, 4 };
/********************************** Macros ***********************************/
/* Sign-extend a value of some number of bits to 32 bits */
#define SignExtend(v,b) \
((v) | (((v) & (1 << ((b) - 1))) ? (uint32_t) 0xFFFFFFFF << (b) : 0))
/*************************** Subsystem Components ****************************/
/* Component includes */
#include "bus.c"
#include "cpu.c"
/***************************** Module Functions ******************************/
/* Process a simulation for some number of clocks */
static int sysEmulate(VB *sim, uint32_t clocks) {
int broke;
broke = cpuEmulate(sim, clocks);
return broke;
}
/* Determine the number of clocks before a break condititon could occur */
static uint32_t sysUntil(VB *sim, uint32_t clocks) {
clocks = cpuUntil(sim, clocks);
return clocks;
}
/******************************* API Functions *******************************/
/* Associate two simulations as peers, or remove an association */
void vbConnect(VB *a, VB *b) {
/* Disconnect */
if (b == NULL) {
if (a->peer != NULL)
a->peer->peer = NULL;
a->peer = NULL;
return;
}
/* The simulations are already linked */
if (a->peer == b && b->peer == a)
return;
/* Disconnect any existing link associations */
if (a->peer != NULL && a->peer != b)
a->peer->peer = NULL;
if (b->peer != NULL && b->peer != a)
b->peer->peer = NULL;
/* Link the two simulations */
a->peer = b;
b->peer = a;
}
/* Process one simulation */
int vbEmulate(VB *sim, uint32_t *clocks) {
int broke; /* The simulation requested an application break */
uint32_t until; /* Maximum clocks before a break could happen */
int x; /* Iterator */
/* Process the simulation until a break condition occurs */
do {
until = *clocks;
until = sysUntil (sim, until);
broke = sysEmulate(sim, until);
*clocks -= until;
} while (!broke && *clocks > 0);
return broke;
}
/* Process multiple simulations */
int vbEmulateMulti(VB **sims, int count, uint32_t *clocks) {
int broke; /* The simulation requested an application break */
uint32_t until; /* Maximum clocks before a break could happen */
int x; /* Iterator */
/* Process simulations until a break condition occurs */
do {
broke = 0;
until = *clocks;
for (x = 0; x < count; x++)
until = sysUntil (sims[x], until);
for (x = 0; x < count; x++)
broke |= sysEmulate(sims[x], until);
*clocks -= until;
} while (!broke && *clocks > 0);
return broke;
}
/* Retrieve a current breakpoint callback */
void* vbGetCallback(VB *sim, 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 sim->onException;
case VB_ONEXECUTE : return sim->onExecute;
case VB_ONFETCH : return sim->onFetch;
case VB_ONREAD : return sim->onRead;
case VB_ONWRITE : return sim->onWrite;
}
#pragma GCC diagnostic pop
return NULL;
}
/* Retrieve the value of PC */
uint32_t vbGetProgramCounter(VB *sim) {
return sim->cpu.pc;
}
/* Retrieve the value of a program register */
int32_t vbGetProgramRegister(VB *sim, int id) {
return id < 1 || id > 31 ? 0 : sim->cpu.program[id];
}
/* Retrieve the ROM buffer */
void* vbGetROM(VB *sim, uint32_t *size) {
if (size != NULL)
*size = sim->cart.romSize;
return sim->cart.rom;
}
/* Retrieve the SRAM buffer */
void* vbGetSRAM(VB *sim, uint32_t *size) {
if (size != NULL)
*size = sim->cart.sramSize;
return sim->cart.sram;
}
/* Retrieve the value of a system register */
uint32_t vbGetSystemRegister(VB *sim, int id) {
switch (id) {
case VB_ADTRE: return sim->cpu.adtre;
case VB_CHCW : return sim->cpu.chcw.ice << 1;
case VB_EIPC : return sim->cpu.eipc;
case VB_EIPSW: return sim->cpu.eipsw;
case VB_FEPC : return sim->cpu.fepc;
case VB_FEPSW: return sim->cpu.fepsw;
case VB_PIR : return 0x00005346;
case VB_TKCW : return 0x000000E0;
case 29 : return sim->cpu.sr29;
case 30 : return 0x00000004;
case 31 : return sim->cpu.sr31;
case VB_ECR : return
(uint32_t) sim->cpu.ecr.fecc << 16 | sim->cpu.ecr.eicc;
case VB_PSW : return
(uint32_t) sim->cpu.psw.i << 16 |
(uint32_t) sim->cpu.psw.np << 15 |
(uint32_t) sim->cpu.psw.ep << 14 |
(uint32_t) sim->cpu.psw.ae << 13 |
(uint32_t) sim->cpu.psw.id << 12 |
(uint32_t) sim->cpu.psw.fro << 9 |
(uint32_t) sim->cpu.psw.fiv << 8 |
(uint32_t) sim->cpu.psw.fzd << 7 |
(uint32_t) sim->cpu.psw.fov << 6 |
(uint32_t) sim->cpu.psw.fud << 5 |
(uint32_t) sim->cpu.psw.fpr << 4 |
(uint32_t) sim->cpu.psw.cy << 3 |
(uint32_t) sim->cpu.psw.ov << 2 |
(uint32_t) sim->cpu.psw.s << 1 |
(uint32_t) sim->cpu.psw.z
;
}
return 0;
}
/* Prepare a simulation state instance for use */
void vbInit(VB *sim) {
/* Breakpoint callbacks */
sim->onException = NULL;
sim->onExecute = NULL;
sim->onFetch = NULL;
sim->onRead = NULL;
sim->onWrite = NULL;
/* System */
sim->peer = NULL;
/* Cartridge */
sim->cart.rom = NULL;
sim->cart.romSize = 0;
sim->cart.sram = NULL;
sim->cart.sramSize = 0;
/* Everything else */
vbReset(sim);
}
/* Read a data unit from the bus */
int32_t vbRead(VB *sim, uint32_t address, int type, int debug) {
return type < 0 || type >= (int) sizeof TYPE_SIZES ? 0 :
busRead(sim, address, type, debug);
}
/* Simulate a hardware reset */
void vbReset(VB *sim) {
uint32_t x; /* Iterator */
/* Subsystem components */
cpuReset(sim);
/* WRAM (the hardware does not do this) */
for (x = 0; x < 0x10000; x++)
sim->wram[x] = 0x00;
}
/* Specify a breakpoint callback */
void vbSetCallback(VB *sim, 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: sim->onException=(VB_EXCEPTIONPROC)callback;break;
case VB_ONEXECUTE : sim->onExecute =(VB_EXECUTEPROC )callback;break;
case VB_ONFETCH : sim->onFetch =(VB_FETCHPROC )callback;break;
case VB_ONREAD : sim->onRead =(VB_READPROC )callback;break;
case VB_ONWRITE : sim->onWrite =(VB_WRITEPROC )callback;break;
}
#pragma GCC diagnostic pop
}
/* Specify a new value for PC */
uint32_t vbSetProgramCounter(VB *sim, uint32_t value) {
value &= 0xFFFFFFFE;
sim->cpu.busWait = 0;
sim->cpu.causeCode = 0;
sim->cpu.clocks = 0;
sim->cpu.fetch = 0;
sim->cpu.pc = value;
sim->cpu.state = CPU_FETCH;
sim->cpu.substring = 0;
return value;
}
/* Specify a new value for a program register */
int32_t vbSetProgramRegister(VB *sim, int id, int32_t value) {
return id < 1 || id > 31 ? 0 : (sim->cpu.program[id] = value);
}
/* Supply a ROM buffer */
int vbSetROM(VB *sim, void *rom, uint32_t size) {
/* Check the buffer size */
if (size < 1024 || size > 0x1000000 || ((size - 1) & size) != 0)
return 0;
/* Configure the ROM buffer */
sim->cart.rom = (uint8_t *) rom;
sim->cart.romSize = size;
return 1;
}
/* Supply an SRAM buffer */
int vbSetSRAM(VB *sim, void *sram, uint32_t size) {
/* Check the buffer size */
if (size == 0 || ((size - 1) & size) != 0)
return 0;
/* Configure the SRAM buffer */
sim->cart.sram = (uint8_t *) sram;
sim->cart.sramSize = size;
return 1;
}
/* Specify a new value for a system register */
uint32_t vbSetSystemRegister(VB *sim, int id, uint32_t value) {
return cpuSetSystemRegister(sim, id, value, 1);
}
/* Write a data unit to the bus */
void vbWrite(VB *sim, uint32_t address, int type, int32_t value, int debug) {
if (type >= 0 && type < (int32_t) sizeof TYPE_SIZES)
busWrite(sim, address, type, value, debug);
}
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