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bsnes/Core/debugger.c

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "debugger.h"
#include "memory.h"
#include "z80_cpu.h"
#include "gb.h"
typedef struct {
bool has_bank;
uint16_t bank:9;
uint16_t value;
} value_t;
typedef struct {
enum {
LVALUE_MEMORY,
LVALUE_REG16,
LVALUE_REG_H,
LVALUE_REG_L,
} kind;
union {
uint16_t *register_address;
value_t memory_address;
};
} lvalue_t;
#define VALUE_16(x) ((value_t){false, 0, (x)})
struct GB_breakpoint_s {
union {
struct {
uint16_t addr;
uint16_t bank; /* -1 = any bank*/
};
uint32_t key; /* For sorting and comparing */
};
char *condition;
};
#define BP_KEY(x) (((struct GB_breakpoint_s){.addr = ((x).value), .bank = (x).has_bank? (x).bank : -1 }).key)
#define GB_WATCHPOINT_R (1)
#define GB_WATCHPOINT_W (2)
struct GB_watchpoint_s {
union {
struct {
uint16_t addr;
uint16_t bank; /* -1 = any bank*/
};
uint32_t key; /* For sorting and comparing */
};
char *condition;
uint8_t flags;
};
#define WP_KEY(x) (((struct GB_watchpoint_s){.addr = ((x).value), .bank = (x).has_bank? (x).bank : -1 }).key)
static uint16_t bank_for_addr(GB_gameboy_t *gb, uint16_t addr)
{
if (addr < 0x4000) {
return gb->mbc_rom0_bank;
}
if (addr < 0x8000) {
return gb->mbc_rom_bank;
}
if (addr < 0xD000) {
return 0;
}
if (addr < 0xE000) {
return gb->cgb_ram_bank;
}
return 0;
}
typedef struct {
uint16_t rom0_bank;
uint16_t rom_bank;
uint8_t mbc_ram_bank;
bool mbc_ram_enable;
uint8_t ram_bank;
uint8_t vram_bank;
} banking_state_t;
static inline void save_banking_state(GB_gameboy_t *gb, banking_state_t *state)
{
state->rom0_bank = gb->mbc_rom0_bank;
state->rom_bank = gb->mbc_rom_bank;
state->mbc_ram_bank = gb->mbc_ram_bank;
state->mbc_ram_enable = gb->mbc_ram_enable;
state->ram_bank = gb->cgb_ram_bank;
state->vram_bank = gb->cgb_vram_bank;
}
static inline void restore_banking_state(GB_gameboy_t *gb, banking_state_t *state)
{
gb->mbc_rom0_bank = state->rom0_bank;
gb->mbc_rom_bank = state->rom_bank;
gb->mbc_ram_bank = state->mbc_ram_bank;
gb->mbc_ram_enable = state->mbc_ram_enable;
gb->cgb_ram_bank = state->ram_bank;
gb->cgb_vram_bank = state->vram_bank;
}
static inline void switch_banking_state(GB_gameboy_t *gb, uint16_t bank)
{
gb->mbc_rom0_bank = bank;
gb->mbc_rom_bank = bank;
gb->mbc_ram_bank = bank;
gb->mbc_ram_enable = true;
if (gb->is_cgb) {
gb->cgb_ram_bank = bank & 7;
gb->cgb_vram_bank = bank & 1;
}
}
static const char *value_to_string(GB_gameboy_t *gb, uint16_t value, bool prefer_name)
{
static __thread char output[256];
const GB_bank_symbol_t *symbol = GB_debugger_find_symbol(gb, value);
if (symbol && (value - symbol->addr > 0x1000 || symbol->addr == 0) ) {
symbol = NULL;
}
/* Avoid overflow */
if (symbol && strlen(symbol->name) > 240) {
symbol = NULL;
}
if (!symbol) {
sprintf(output, "$%04x", value);
}
else if (symbol->addr == value) {
if (prefer_name) {
sprintf(output, "%s ($%04x)", symbol->name, value);
}
else {
sprintf(output, "$%04x (%s)", value, symbol->name);
}
}
else {
if (prefer_name) {
sprintf(output, "%s+$%03x ($%04x)", symbol->name, value - symbol->addr, value);
}
else {
sprintf(output, "$%04x (%s+$%03x)", value, symbol->name, value - symbol->addr);
}
}
return output;
}
static const char *debugger_value_to_string(GB_gameboy_t *gb, value_t value, bool prefer_name)
{
if (!value.has_bank) return value_to_string(gb, value.value, prefer_name);
static __thread char output[256];
const GB_bank_symbol_t *symbol = GB_map_find_symbol(gb->bank_symbols[value.bank], value.value);
if (symbol && (value.value - symbol->addr > 0x1000 || symbol->addr == 0) ) {
symbol = NULL;
}
/* Avoid overflow */
if (symbol && strlen(symbol->name) > 240) {
symbol = NULL;
}
if (!symbol) {
sprintf(output, "$%02x:$%04x", value.bank, value.value);
}
else if (symbol->addr == value.value) {
if (prefer_name) {
sprintf(output, "%s ($%02x:$%04x)", symbol->name, value.bank, value.value);
}
else {
sprintf(output, "$%02x:$%04x (%s)", value.bank, value.value, symbol->name);
}
}
else {
if (prefer_name) {
sprintf(output, "%s+$%03x ($%02x:$%04x)", symbol->name, value.value - symbol->addr, value.bank, value.value);
}
else {
sprintf(output, "$%02x:$%04x (%s+$%03x)", value.bank, value.value, symbol->name, value.value - symbol->addr);
}
}
return output;
}
static value_t read_lvalue(GB_gameboy_t *gb, lvalue_t lvalue)
{
/* Not used until we add support for operators like += */
switch (lvalue.kind) {
case LVALUE_MEMORY:
if (lvalue.memory_address.has_bank) {
banking_state_t state;
save_banking_state(gb, &state);
switch_banking_state(gb, lvalue.memory_address.bank);
value_t r = VALUE_16(GB_read_memory(gb, lvalue.memory_address.value));
restore_banking_state(gb, &state);
return r;
}
return VALUE_16(GB_read_memory(gb, lvalue.memory_address.value));
case LVALUE_REG16:
return VALUE_16(*lvalue.register_address);
case LVALUE_REG_L:
return VALUE_16(*lvalue.register_address & 0x00FF);
case LVALUE_REG_H:
return VALUE_16(*lvalue.register_address >> 8);
}
}
static void write_lvalue(GB_gameboy_t *gb, lvalue_t lvalue, uint16_t value)
{
switch (lvalue.kind) {
case LVALUE_MEMORY:
if (lvalue.memory_address.has_bank) {
banking_state_t state;
save_banking_state(gb, &state);
switch_banking_state(gb, lvalue.memory_address.bank);
GB_write_memory(gb, lvalue.memory_address.value, value);
restore_banking_state(gb, &state);
return;
}
GB_write_memory(gb, lvalue.memory_address.value, value);
return;
case LVALUE_REG16:
*lvalue.register_address = value;
return;
case LVALUE_REG_L:
*lvalue.register_address &= 0xFF00;
*lvalue.register_address |= value & 0xFF;
return;
case LVALUE_REG_H:
*lvalue.register_address &= 0x00FF;
*lvalue.register_address |= value << 8;
return;
}
}
/* 16 bit value <op> 16 bit value = 16 bit value
25 bit address <op> 16 bit value = 25 bit address
16 bit value <op> 25 bit address = 25 bit address
25 bit address <op> 25 bit address = 16 bit value (since adding pointers, for examples, makes no sense)
Boolean operators always return a 16-bit value
*/
#define FIX_BANK(x) ((value_t){a.has_bank ^ b.has_bank, a.has_bank? a.bank : b.bank, (x)})
static value_t add(value_t a, value_t b) {return FIX_BANK(a.value + b.value);}
static value_t sub(value_t a, value_t b) {return FIX_BANK(a.value - b.value);}
static value_t mul(value_t a, value_t b) {return FIX_BANK(a.value * b.value);}
static value_t _div(value_t a, value_t b) {
if (b.value == 0) {
return FIX_BANK(0);
}
return FIX_BANK(a.value / b.value);
};
static value_t mod(value_t a, value_t b) {
if (b.value == 0) {
return FIX_BANK(0);
}
return FIX_BANK(a.value % b.value);
};
static value_t and(value_t a, value_t b) {return FIX_BANK(a.value & b.value);}
static value_t or(value_t a, value_t b) {return FIX_BANK(a.value | b.value);}
static value_t xor(value_t a, value_t b) {return FIX_BANK(a.value ^ b.value);}
static value_t shleft(value_t a, value_t b) {return FIX_BANK(a.value << b.value);}
static value_t shright(value_t a, value_t b) {return FIX_BANK(a.value >> b.value);}
static value_t assign(GB_gameboy_t *gb, lvalue_t a, uint16_t b)
{
write_lvalue(gb, a, b);
return read_lvalue(gb, a);
}
static value_t bool_and(value_t a, value_t b) {return VALUE_16(a.value && b.value);}
static value_t bool_or(value_t a, value_t b) {return VALUE_16(a.value || b.value);}
static value_t equals(value_t a, value_t b) {return VALUE_16(a.value == b.value);}
static value_t different(value_t a, value_t b) {return VALUE_16(a.value != b.value);}
static value_t lower(value_t a, value_t b) {return VALUE_16(a.value < b.value);}
static value_t greater(value_t a, value_t b) {return VALUE_16(a.value > b.value);}
static value_t lower_equals(value_t a, value_t b) {return VALUE_16(a.value <= b.value);}
static value_t greater_equals(value_t a, value_t b) {return VALUE_16(a.value >= b.value);}
static value_t bank(value_t a, value_t b) {return (value_t) {true, a.value, b.value};}
static struct {
const char *string;
char priority;
value_t (*operator)(value_t, value_t);
value_t (*lvalue_operator)(GB_gameboy_t *, lvalue_t, uint16_t);
} operators[] =
{
// Yes. This is not C-like. But it makes much more sense.
// Deal with it.
{"+", 0, add},
{"-", 0, sub},
{"||", 0, bool_or},
{"|", 0, or},
{"*", 1, mul},
{"/", 1, _div},
{"%", 1, mod},
{"&&", 1, bool_and},
{"&", 1, and},
{"^", 1, xor},
{"<<", 2, shleft},
{"<=", 3, lower_equals},
{"<", 3, lower},
{">>", 2, shright},
{">=", 3, greater_equals},
{">", 3, greater},
{"==", 3, equals},
{"=", -1, NULL, assign},
{"!=", 3, different},
{":", 4, bank},
};
value_t debugger_evaluate(GB_gameboy_t *gb, const char *string,
size_t length, bool *error,
uint16_t *watchpoint_address, uint8_t *watchpoint_new_value);
static lvalue_t debugger_evaluate_lvalue(GB_gameboy_t *gb, const char *string,
size_t length, bool *error,
uint16_t *watchpoint_address, uint8_t *watchpoint_new_value)
{
*error = false;
// Strip whitespace
while (length && (string[0] == ' ' || string[0] == '\n' || string[0] == '\r' || string[0] == '\t')) {
string++;
length--;
}
while (length && (string[length-1] == ' ' || string[length-1] == '\n' || string[length-1] == '\r' || string[length-1] == '\t')) {
length--;
}
if (length == 0)
{
GB_log(gb, "Expected expression.\n");
*error = true;
return (lvalue_t){0,};
}
if (string[0] == '(' && string[length - 1] == ')') {
// Attempt to strip parentheses
signed int depth = 0;
for (int i = 0; i < length; i++) {
if (string[i] == '(') depth++;
if (depth == 0) {
// First and last are not matching
depth = 1;
break;
}
if (string[i] == ')') depth--;
}
if (depth == 0) return debugger_evaluate_lvalue(gb, string + 1, length - 2, error, watchpoint_address, watchpoint_new_value);
}
else if (string[0] == '[' && string[length - 1] == ']') {
// Attempt to strip square parentheses (memory dereference)
signed int depth = 0;
for (int i = 0; i < length; i++) {
if (string[i] == '[') depth++;
if (depth == 0) {
// First and last are not matching
depth = 1;
break;
}
if (string[i] == ']') depth--;
}
if (depth == 0) {
return (lvalue_t){LVALUE_MEMORY, .memory_address = debugger_evaluate(gb, string + 1, length - 2, error, watchpoint_address, watchpoint_new_value)};
}
}
// Registers
if (string[0] != '$' && (string[0] < '0' || string[0] > '9')) {
if (length == 1) {
switch (string[0]) {
case 'a': return (lvalue_t){LVALUE_REG_H, .register_address = &gb->registers[GB_REGISTER_AF]};
case 'f': return (lvalue_t){LVALUE_REG_L, .register_address = &gb->registers[GB_REGISTER_AF]};
case 'b': return (lvalue_t){LVALUE_REG_H, .register_address = &gb->registers[GB_REGISTER_BC]};
case 'c': return (lvalue_t){LVALUE_REG_L, .register_address = &gb->registers[GB_REGISTER_BC]};
case 'd': return (lvalue_t){LVALUE_REG_H, .register_address = &gb->registers[GB_REGISTER_DE]};
case 'e': return (lvalue_t){LVALUE_REG_L, .register_address = &gb->registers[GB_REGISTER_DE]};
case 'h': return (lvalue_t){LVALUE_REG_H, .register_address = &gb->registers[GB_REGISTER_HL]};
case 'l': return (lvalue_t){LVALUE_REG_L, .register_address = &gb->registers[GB_REGISTER_HL]};
}
}
else if (length == 2) {
switch (string[0]) {
case 'a': if (string[1] == 'f') return (lvalue_t){LVALUE_REG16, .register_address = &gb->registers[GB_REGISTER_AF]};
case 'b': if (string[1] == 'c') return (lvalue_t){LVALUE_REG16, .register_address = &gb->registers[GB_REGISTER_BC]};
case 'd': if (string[1] == 'e') return (lvalue_t){LVALUE_REG16, .register_address = &gb->registers[GB_REGISTER_DE]};
case 'h': if (string[1] == 'l') return (lvalue_t){LVALUE_REG16, .register_address = &gb->registers[GB_REGISTER_HL]};
case 's': if (string[1] == 'p') return (lvalue_t){LVALUE_REG16, .register_address = &gb->registers[GB_REGISTER_SP]};
case 'p': if (string[1] == 'c') return (lvalue_t){LVALUE_REG16, .register_address = &gb->pc};
}
}
GB_log(gb, "Unknown register: %.*s\n", (unsigned int) length, string);
*error = true;
return (lvalue_t){0,};
}
GB_log(gb, "Expression is not an lvalue: %.*s\n", (unsigned int) length, string);
*error = true;
return (lvalue_t){0,};
}
#define ERROR ((value_t){0,})
value_t debugger_evaluate(GB_gameboy_t *gb, const char *string,
size_t length, bool *error,
uint16_t *watchpoint_address, uint8_t *watchpoint_new_value)
{
/* Disable watchpoints while evaulating expressions */
uint16_t n_watchpoints = gb->n_watchpoints;
gb->n_watchpoints = 0;
value_t ret = ERROR;
*error = false;
// Strip whitespace
while (length && (string[0] == ' ' || string[0] == '\n' || string[0] == '\r' || string[0] == '\t')) {
string++;
length--;
}
while (length && (string[length-1] == ' ' || string[length-1] == '\n' || string[length-1] == '\r' || string[length-1] == '\t')) {
length--;
}
if (length == 0)
{
GB_log(gb, "Expected expression.\n");
*error = true;
goto exit;
}
if (string[0] == '(' && string[length - 1] == ')') {
// Attempt to strip parentheses
signed int depth = 0;
for (int i = 0; i < length; i++) {
if (string[i] == '(') depth++;
if (depth == 0) {
// First and last are not matching
depth = 1;
break;
}
if (string[i] == ')') depth--;
}
if (depth == 0) {
ret = debugger_evaluate(gb, string + 1, length - 2, error, watchpoint_address, watchpoint_new_value);
goto exit;
}
}
else if (string[0] == '[' && string[length - 1] == ']') {
// Attempt to strip square parentheses (memory dereference)
signed int depth = 0;
for (int i = 0; i < length; i++) {
if (string[i] == '[') depth++;
if (depth == 0) {
// First and last are not matching
depth = 1;
break;
}
if (string[i] == ']') depth--;
}
if (depth == 0) {
value_t addr = debugger_evaluate(gb, string + 1, length - 2, error, watchpoint_address, watchpoint_new_value);
banking_state_t state;
if (addr.bank) {
save_banking_state(gb, &state);
switch_banking_state(gb, addr.bank);
}
ret = VALUE_16(GB_read_memory(gb, addr.value));
if (addr.bank) {
restore_banking_state(gb, &state);
}
goto exit;
}
}
// Search for lowest priority operator
signed int depth = 0;
unsigned int operator_index = -1;
unsigned int operator_pos = 0;
for (int i = 0; i < length; i++) {
if (string[i] == '(') depth++;
else if (string[i] == ')') depth--;
else if (string[i] == '[') depth++;
else if (string[i] == ']') depth--;
else if (depth == 0) {
for (int j = 0; j < sizeof(operators) / sizeof(operators[0]); j++) {
if (strlen(operators[j].string) > length - i) continue; // Operator too big.
// Priority higher than what we already have.
if (operator_index != -1 && operators[operator_index].priority < operators[j].priority) continue;
unsigned long operator_length = strlen(operators[j].string);
if (memcmp(string + i, operators[j].string, operator_length) == 0) {
// Found an operator!
operator_pos = i;
operator_index = j;
/* for supporting = vs ==, etc*/
i += operator_length - 1;
break;
}
}
}
}
if (operator_index != -1) {
unsigned int right_start = (unsigned int)(operator_pos + strlen(operators[operator_index].string));
value_t right = debugger_evaluate(gb, string + right_start, length - right_start, error, watchpoint_address, watchpoint_new_value);
if (*error) goto exit;
if (operators[operator_index].lvalue_operator) {
lvalue_t left = debugger_evaluate_lvalue(gb, string, operator_pos, error, watchpoint_address, watchpoint_new_value);
if (*error) goto exit;
ret = operators[operator_index].lvalue_operator(gb, left, right.value);
goto exit;
}
value_t left = debugger_evaluate(gb, string, operator_pos, error, watchpoint_address, watchpoint_new_value);
if (*error) goto exit;
ret = operators[operator_index].operator(left, right);
goto exit;
}
// Not an expression - must be a register or a literal
// Registers
if (string[0] != '$' && (string[0] < '0' || string[0] > '9')) {
if (length == 1) {
switch (string[0]) {
case 'a': ret = VALUE_16(gb->registers[GB_REGISTER_AF] >> 8); goto exit;
case 'f': ret = VALUE_16(gb->registers[GB_REGISTER_AF] & 0xFF); goto exit;
case 'b': ret = VALUE_16(gb->registers[GB_REGISTER_BC] >> 8); goto exit;
case 'c': ret = VALUE_16(gb->registers[GB_REGISTER_BC] & 0xFF); goto exit;
case 'd': ret = VALUE_16(gb->registers[GB_REGISTER_DE] >> 8); goto exit;
case 'e': ret = VALUE_16(gb->registers[GB_REGISTER_DE] & 0xFF); goto exit;
case 'h': ret = VALUE_16(gb->registers[GB_REGISTER_HL] >> 8); goto exit;
case 'l': ret = VALUE_16(gb->registers[GB_REGISTER_HL] & 0xFF); goto exit;
}
}
else if (length == 2) {
switch (string[0]) {
case 'a': if (string[1] == 'f') {ret = VALUE_16(gb->registers[GB_REGISTER_AF]); goto exit;}
case 'b': if (string[1] == 'c') {ret = VALUE_16(gb->registers[GB_REGISTER_BC]); goto exit;}
case 'd': if (string[1] == 'e') {ret = VALUE_16(gb->registers[GB_REGISTER_DE]); goto exit;}
case 'h': if (string[1] == 'l') {ret = VALUE_16(gb->registers[GB_REGISTER_HL]); goto exit;}
case 's': if (string[1] == 'p') {ret = VALUE_16(gb->registers[GB_REGISTER_SP]); goto exit;}
case 'p': if (string[1] == 'c') {ret = (value_t){true, bank_for_addr(gb, gb->pc), gb->pc}; goto exit;}
}
}
else if (length == 3) {
if (watchpoint_address && memcmp(string, "old", 3) == 0) {
ret = VALUE_16(GB_read_memory(gb, *watchpoint_address));
goto exit;
}
if (watchpoint_new_value && memcmp(string, "new", 3) == 0) {
ret = VALUE_16(*watchpoint_new_value);
goto exit;
}
/* $new is identical to $old in read conditions */
if (watchpoint_address && memcmp(string, "new", 3) == 0) {
ret = VALUE_16(GB_read_memory(gb, *watchpoint_address));
goto exit;
}
}
char symbol_name[length + 1];
memcpy(symbol_name, string, length);
symbol_name[length] = 0;
const GB_symbol_t *symbol = GB_reversed_map_find_symbol(&gb->reversed_symbol_map, symbol_name);
if (symbol) {
ret = (value_t){true, symbol->bank, symbol->addr};
goto exit;
}
GB_log(gb, "Unknown register or symbol: %.*s\n", (unsigned int) length, string);
*error = true;
goto exit;
}
char *end;
int base = 10;
if (string[0] == '$') {
string++;
base = 16;
length--;
}
uint16_t literal = (uint16_t) (strtol(string, &end, base));
if (end != string + length) {
GB_log(gb, "Failed to parse: %.*s\n", (unsigned int) length, string);
*error = true;
goto exit;
}
ret = VALUE_16(literal);
exit:
gb->n_watchpoints = n_watchpoints;
return ret;
}
struct debugger_command_s;
typedef bool debugger_command_imp_t(GB_gameboy_t *gb, char *arguments, char *modifiers, const struct debugger_command_s *command);
typedef struct debugger_command_s {
const char *command;
uint8_t min_length;
debugger_command_imp_t *implementation;
const char *help_string; // Null if should not appear in help
const char *arguments_format; // For usage message
const char *modifiers_format; // For usage message
} debugger_command_t;
static const char *lstrip(const char *str)
{
while (*str == ' ' || *str == '\t') {
str++;
}
return str;
}
#define STOPPED_ONLY \
if (!gb->debug_stopped) { \
GB_log(gb, "Program is running. \n"); \
return false; \
}
#define NO_MODIFIERS \
if (modifiers) { \
print_usage(gb, command); \
return true; \
}
static void print_usage(GB_gameboy_t *gb, const debugger_command_t *command)
{
GB_log(gb, "Usage: %s", command->command);
if (command->modifiers_format) {
GB_log(gb, "[/%s]", command->modifiers_format);
}
if (command->arguments_format) {
GB_log(gb, " %s", command->arguments_format);
}
GB_log(gb, "\n");
}
static bool cont(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
STOPPED_ONLY
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
}
gb->debug_stopped = false;
return false;
}
static bool next(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
STOPPED_ONLY
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
}
gb->debug_stopped = false;
gb->debug_next_command = true;
gb->debug_call_depth = 0;
return false;
}
static bool step(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
STOPPED_ONLY
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
}
return false;
}
static bool finish(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
STOPPED_ONLY
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
}
gb->debug_stopped = false;
gb->debug_fin_command = true;
gb->debug_call_depth = 0;
return false;
}
static bool stack_leak_detection(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
STOPPED_ONLY
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
}
gb->debug_stopped = false;
gb->stack_leak_detection = true;
gb->debug_call_depth = 0;
return false;
}
static bool registers(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
}
GB_log(gb, "AF = $%04x\n", gb->registers[GB_REGISTER_AF]); /* AF can't really be an address */
GB_log(gb, "BC = %s\n", value_to_string(gb, gb->registers[GB_REGISTER_BC], false));
GB_log(gb, "DE = %s\n", value_to_string(gb, gb->registers[GB_REGISTER_DE], false));
GB_log(gb, "HL = %s\n", value_to_string(gb, gb->registers[GB_REGISTER_HL], false));
GB_log(gb, "SP = %s\n", value_to_string(gb, gb->registers[GB_REGISTER_SP], false));
GB_log(gb, "PC = %s\n", value_to_string(gb, gb->pc, false));
GB_log(gb, "Display Controller: LY = %d/%u\n", gb->io_registers[GB_IO_LY], gb->display_cycles % 456);
return true;
}
/* Find the index of the closest breakpoint equal or greater to addr */
static uint16_t find_breakpoint(GB_gameboy_t *gb, value_t addr)
{
if (!gb->breakpoints) {
return 0;
}
uint32_t key = BP_KEY(addr);
int min = 0;
int max = gb->n_breakpoints;
while (min < max) {
uint16_t pivot = (min + max) / 2;
if (gb->breakpoints[pivot].key == key) return pivot;
if (gb->breakpoints[pivot].key > key) {
max = pivot;
}
else {
min = pivot + 1;
}
}
return (uint16_t) min;
}
static bool breakpoint(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
if (strlen(lstrip(arguments)) == 0) {
print_usage(gb, command);
return true;
}
if (gb->n_breakpoints == (typeof(gb->n_breakpoints)) -1) {
GB_log(gb, "Too many breakpoints set\n");
return true;
}
char *condition = NULL;
if ((condition = strstr(arguments, " if "))) {
*condition = 0;
condition += strlen(" if ");
/* Verify condition is sane (Todo: This might have side effects!) */
bool error;
debugger_evaluate(gb, condition, (unsigned int)strlen(condition), &error, NULL, NULL);
if (error) return true;
}
bool error;
value_t result = debugger_evaluate(gb, arguments, (unsigned int)strlen(arguments), &error, NULL, NULL);
uint32_t key = BP_KEY(result);
if (error) return true;
uint16_t index = find_breakpoint(gb, result);
if (index < gb->n_breakpoints && gb->breakpoints[index].key == key) {
GB_log(gb, "Breakpoint already set at %s\n", debugger_value_to_string(gb, result, true));
if (!gb->breakpoints[index].condition && condition) {
GB_log(gb, "Added condition to breakpoint\n");
gb->breakpoints[index].condition = strdup(condition);
}
else if (gb->breakpoints[index].condition && condition) {
GB_log(gb, "Replaced breakpoint condition\n");
free(gb->breakpoints[index].condition);
gb->breakpoints[index].condition = strdup(condition);
}
else if (gb->breakpoints[index].condition && !condition) {
GB_log(gb, "Removed breakpoint condition\n");
free(gb->breakpoints[index].condition);
gb->breakpoints[index].condition = NULL;
}
return true;
}
gb->breakpoints = realloc(gb->breakpoints, (gb->n_breakpoints + 1) * sizeof(gb->breakpoints[0]));
memmove(&gb->breakpoints[index + 1], &gb->breakpoints[index], (gb->n_breakpoints - index) * sizeof(gb->breakpoints[0]));
gb->breakpoints[index].key = key;
if (condition) {
gb->breakpoints[index].condition = strdup(condition);
}
else {
gb->breakpoints[index].condition = NULL;
}
gb->n_breakpoints++;
GB_log(gb, "Breakpoint set at %s\n", debugger_value_to_string(gb, result, true));
return true;
}
static bool delete(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
if (strlen(lstrip(arguments)) == 0) {
for (unsigned i = gb->n_breakpoints; i--;) {
if (gb->breakpoints[i].condition) {
free(gb->breakpoints[i].condition);
}
}
free(gb->breakpoints);
gb->breakpoints = NULL;
gb->n_breakpoints = 0;
return true;
}
bool error;
value_t result = debugger_evaluate(gb, arguments, (unsigned int)strlen(arguments), &error, NULL, NULL);
uint32_t key = BP_KEY(result);
if (error) return true;
uint16_t index = find_breakpoint(gb, result);
if (index >= gb->n_breakpoints || gb->breakpoints[index].key != key) {
GB_log(gb, "No breakpoint set at %s\n", debugger_value_to_string(gb, result, true));
return true;
}
if (gb->breakpoints[index].condition) {
free(gb->breakpoints[index].condition);
}
memmove(&gb->breakpoints[index], &gb->breakpoints[index + 1], (gb->n_breakpoints - index - 1) * sizeof(gb->breakpoints[0]));
gb->n_breakpoints--;
gb->breakpoints = realloc(gb->breakpoints, gb->n_breakpoints * sizeof(gb->breakpoints[0]));
GB_log(gb, "Breakpoint removed from %s\n", debugger_value_to_string(gb, result, true));
return true;
}
/* Find the index of the closest watchpoint equal or greater to addr */
static uint16_t find_watchpoint(GB_gameboy_t *gb, value_t addr)
{
if (!gb->watchpoints) {
return 0;
}
uint32_t key = WP_KEY(addr);
int min = 0;
int max = gb->n_watchpoints;
while (min < max) {
uint16_t pivot = (min + max) / 2;
if (gb->watchpoints[pivot].key == key) return pivot;
if (gb->watchpoints[pivot].key > key) {
max = pivot;
}
else {
min = pivot + 1;
}
}
return (uint16_t) min;
}
static bool watch(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
if (strlen(lstrip(arguments)) == 0) {
print_usage:
print_usage(gb, command);
return true;
}
if (gb->n_watchpoints == (typeof(gb->n_watchpoints)) -1) {
GB_log(gb, "Too many watchpoints set\n");
return true;
}
if (!modifiers) {
modifiers = "w";
}
uint8_t flags = 0;
while (*modifiers) {
switch (*modifiers) {
case 'r':
flags |= GB_WATCHPOINT_R;
break;
case 'w':
flags |= GB_WATCHPOINT_W;
break;
default:
goto print_usage;
}
modifiers++;
}
if (!flags) {
goto print_usage;
}
char *condition = NULL;
if ((condition = strstr(arguments, " if "))) {
*condition = 0;
condition += strlen(" if ");
/* Verify condition is sane (Todo: This might have side effects!) */
bool error;
/* To make $new and $old legal */
uint16_t dummy = 0;
uint8_t dummy2 = 0;
debugger_evaluate(gb, condition, (unsigned int)strlen(condition), &error, &dummy, &dummy2);
if (error) return true;
}
bool error;
value_t result = debugger_evaluate(gb, arguments, (unsigned int)strlen(arguments), &error, NULL, NULL);
uint32_t key = WP_KEY(result);
if (error) return true;
uint16_t index = find_watchpoint(gb, result);
if (index < gb->n_watchpoints && gb->watchpoints[index].key == key) {
GB_log(gb, "Watchpoint already set at %s\n", debugger_value_to_string(gb, result, true));
if (gb->watchpoints[index].flags != flags) {
GB_log(gb, "Modified watchpoint type\n");
gb->watchpoints[index].flags = flags;
}
if (!gb->watchpoints[index].condition && condition) {
GB_log(gb, "Added condition to watchpoint\n");
gb->watchpoints[index].condition = strdup(condition);
}
else if (gb->watchpoints[index].condition && condition) {
GB_log(gb, "Replaced watchpoint condition\n");
free(gb->watchpoints[index].condition);
gb->watchpoints[index].condition = strdup(condition);
}
else if (gb->watchpoints[index].condition && !condition) {
GB_log(gb, "Removed watchpoint condition\n");
free(gb->watchpoints[index].condition);
gb->watchpoints[index].condition = NULL;
}
return true;
}
gb->watchpoints = realloc(gb->watchpoints, (gb->n_watchpoints + 1) * sizeof(gb->watchpoints[0]));
memmove(&gb->watchpoints[index + 1], &gb->watchpoints[index], (gb->n_watchpoints - index) * sizeof(gb->watchpoints[0]));
gb->watchpoints[index].key = key;
gb->watchpoints[index].flags = flags;
if (condition) {
gb->watchpoints[index].condition = strdup(condition);
}
else {
gb->watchpoints[index].condition = NULL;
}
gb->n_watchpoints++;
GB_log(gb, "Watchpoint set at %s\n", debugger_value_to_string(gb, result, true));
return true;
}
static bool unwatch(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
if (strlen(lstrip(arguments)) == 0) {
for (unsigned i = gb->n_watchpoints; i--;) {
if (gb->watchpoints[i].condition) {
free(gb->watchpoints[i].condition);
}
}
free(gb->watchpoints);
gb->watchpoints = NULL;
gb->n_watchpoints = 0;
return true;
}
bool error;
value_t result = debugger_evaluate(gb, arguments, (unsigned int)strlen(arguments), &error, NULL, NULL);
uint32_t key = WP_KEY(result);
if (error) return true;
uint16_t index = find_watchpoint(gb, result);
if (index >= gb->n_watchpoints || gb->watchpoints[index].key != key) {
GB_log(gb, "No watchpoint set at %s\n", debugger_value_to_string(gb, result, true));
return true;
}
if (gb->watchpoints[index].condition) {
free(gb->watchpoints[index].condition);
}
memmove(&gb->watchpoints[index], &gb->watchpoints[index + 1], (gb->n_watchpoints - index - 1) * sizeof(gb->watchpoints[0]));
gb->n_watchpoints--;
gb->watchpoints = realloc(gb->watchpoints, gb->n_watchpoints* sizeof(gb->watchpoints[0]));
GB_log(gb, "Watchpoint removed from %s\n", debugger_value_to_string(gb, result, true));
return true;
}
static bool list(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
}
if (gb->n_breakpoints == 0) {
GB_log(gb, "No breakpoints set.\n");
}
else {
GB_log(gb, "%d breakpoint(s) set:\n", gb->n_breakpoints);
for (uint16_t i = 0; i < gb->n_breakpoints; i++) {
value_t addr = (value_t){gb->breakpoints[i].bank != (uint16_t)-1, gb->breakpoints[i].bank, gb->breakpoints[i].addr};
if (gb->breakpoints[i].condition) {
GB_log(gb, " %d. %s (Condition: %s)\n", i + 1,
debugger_value_to_string(gb, addr, addr.has_bank),
gb->breakpoints[i].condition);
}
else {
GB_log(gb, " %d. %s\n", i + 1, debugger_value_to_string(gb, addr, addr.has_bank));
}
}
}
if (gb->n_watchpoints == 0) {
GB_log(gb, "No watchpoints set.\n");
}
else {
GB_log(gb, "%d watchpoint(s) set:\n", gb->n_watchpoints);
for (uint16_t i = 0; i < gb->n_watchpoints; i++) {
value_t addr = (value_t){gb->watchpoints[i].bank != (uint16_t)-1, gb->watchpoints[i].bank, gb->watchpoints[i].addr};
if (gb->watchpoints[i].condition) {
GB_log(gb, " %d. %s (%c%c, Condition: %s)\n", i + 1, debugger_value_to_string(gb, addr, addr.has_bank),
(gb->watchpoints[i].flags & GB_WATCHPOINT_R)? 'r' : '-',
(gb->watchpoints[i].flags & GB_WATCHPOINT_W)? 'w' : '-',
gb->watchpoints[i].condition);
}
else {
GB_log(gb, " %d. %s (%c%c)\n", i + 1, debugger_value_to_string(gb,addr, addr.has_bank),
(gb->watchpoints[i].flags & GB_WATCHPOINT_R)? 'r' : '-',
(gb->watchpoints[i].flags & GB_WATCHPOINT_W)? 'w' : '-');
}
}
}
return true;
}
static bool _should_break(GB_gameboy_t *gb, value_t addr)
{
uint16_t index = find_breakpoint(gb, addr);
uint32_t key = BP_KEY(addr);
if (index < gb->n_breakpoints && gb->breakpoints[index].key == key) {
if (!gb->breakpoints[index].condition) {
return true;
}
bool error;
bool condition = debugger_evaluate(gb, gb->breakpoints[index].condition,
(unsigned int)strlen(gb->breakpoints[index].condition), &error, NULL, NULL).value;
if (error) {
/* Should never happen */
GB_log(gb, "An internal error has occured\n");
return true;
}
return condition;
}
return false;
}
static bool should_break(GB_gameboy_t *gb, uint16_t addr)
{
/* Try any-bank breakpoint */
value_t full_addr = (VALUE_16(addr));
if (_should_break(gb, full_addr)) return true;
/* Try bank-specific breakpoint */
full_addr.has_bank = true;
full_addr.bank = bank_for_addr(gb, addr);
return _should_break(gb, full_addr);
}
static bool print(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
if (strlen(lstrip(arguments)) == 0) {
print_usage(gb, command);
return true;
}
if (!modifiers || !modifiers[0]) {
modifiers = "a";
}
else if (modifiers[1]) {
print_usage(gb, command);
return true;
}
bool error;
value_t result = debugger_evaluate(gb, arguments, (unsigned int)strlen(arguments), &error, NULL, NULL);
if (!error) {
switch (modifiers[0]) {
case 'a':
GB_log(gb, "=%s\n", debugger_value_to_string(gb, result, false));
break;
case 'd':
GB_log(gb, "=%d\n", result.value);
break;
case 'x':
GB_log(gb, "=$%x\n", result.value);
break;
case 'o':
GB_log(gb, "=0%o\n", result.value);
break;
case 'b':
{
if (!result.value) {
GB_log(gb, "=%%0\n");
break;
}
char binary[17];
binary[16] = 0;
char *ptr = &binary[16];
while (result.value) {
*(--ptr) = (result.value & 1)? '1' : '0';
result.value >>= 1;
}
GB_log(gb, "=%%%s\n", ptr);
break;
}
default:
break;
}
}
return true;
}
static bool examine(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
if (strlen(lstrip(arguments)) == 0) {
print_usage(gb, command);
return true;
}
bool error;
value_t addr = debugger_evaluate(gb, arguments, (unsigned int)strlen(arguments), &error, NULL, NULL);
uint16_t count = 32;
if (modifiers) {
char *end;
count = (uint16_t) (strtol(modifiers, &end, 10));
if (*end) {
print_usage(gb, command);
return true;
}
}
if (!error) {
if (addr.has_bank) {
banking_state_t old_state;
save_banking_state(gb, &old_state);
switch_banking_state(gb, addr.bank);
while (count) {
GB_log(gb, "%02x:%04x: ", addr.bank, addr.value);
for (int i = 0; i < 16 && count; i++) {
GB_log(gb, "%02x ", GB_read_memory(gb, addr.value + i));
count--;
}
addr.value += 16;
GB_log(gb, "\n");
}
restore_banking_state(gb, &old_state);
}
else {
while (count) {
GB_log(gb, "%04x: ", addr.value);
for (int i = 0; i < 16 && count; i++) {
GB_log(gb, "%02x ", GB_read_memory(gb, addr.value + i));
count--;
}
addr.value += 16;
GB_log(gb, "\n");
}
}
}
return true;
}
static bool disassemble(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
if (strlen(lstrip(arguments)) == 0) {
arguments = "pc";
}
bool error;
value_t addr = debugger_evaluate(gb, arguments, (unsigned int)strlen(arguments), &error, NULL, NULL);
uint16_t count = 5;
if (modifiers) {
char *end;
count = (uint16_t) (strtol(modifiers, &end, 10));
if (*end) {
print_usage(gb, command);
return true;
}
}
if (!error) {
if (addr.has_bank) {
banking_state_t old_state;
save_banking_state(gb, &old_state);
switch_banking_state(gb, addr.bank);
GB_cpu_disassemble(gb, addr.value, count);
restore_banking_state(gb, &old_state);
}
else {
GB_cpu_disassemble(gb, addr.value, count);
}
}
return true;
}
static bool mbc(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
}
const GB_cartridge_t *cartridge = gb->cartridge_type;
if (cartridge->has_ram) {
GB_log(gb, "Cartrdige includes%s RAM: $%x bytes\n", cartridge->has_battery? " battery-backed": "", gb->mbc_ram_size);
}
else {
GB_log(gb, "No cartridge RAM\n");
}
if (cartridge->mbc_type) {
static const char * const mapper_names[] = {
[GB_MBC1] = "MBC1",
[GB_MBC2] = "MBC2",
[GB_MBC3] = "MBC3",
[GB_MBC5] = "MBC5",
[GB_HUC1] = "HUC1",
[GB_HUC3] = "HUC3",
};
GB_log(gb, "%s\n", mapper_names[cartridge->mbc_type]);
GB_log(gb, "Current mapped ROM bank: %x\n", gb->mbc_rom_bank);
if (cartridge->has_ram) {
GB_log(gb, "Current mapped RAM bank: %x\n", gb->mbc_ram_bank);
GB_log(gb, "RAM is curently %s\n", gb->mbc_ram_enable? "enabled" : "disabled");
}
if (cartridge->mbc_type == GB_MBC1 && gb->mbc1_wiring == GB_STANDARD_MBC1_WIRING) {
GB_log(gb, "MBC1 banking mode is %s\n", gb->mbc1.mode == 1 ? "RAM" : "ROM");
}
if (cartridge->mbc_type == GB_MBC1 && gb->mbc1_wiring == GB_MBC1M_WIRING) {
GB_log(gb, "MBC1 uses MBC1M wiring. \n");
GB_log(gb, "Current mapped ROM0 bank: %x\n", gb->mbc_rom0_bank);
GB_log(gb, "MBC1 multicart banking mode is %s\n", gb->mbc1.mode == 1 ? "enabled" : "disabled");
}
}
else {
GB_log(gb, "No MBC\n");
}
if (cartridge->has_rumble) {
GB_log(gb, "Cart contains a rumble pak\n");
}
if (cartridge->has_rtc) {
GB_log(gb, "Cart contains a real time clock\n");
}
return true;
}
static bool backtrace(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
}
GB_log(gb, " 1. %s\n", value_to_string(gb, gb->pc, true));
for (unsigned int i = gb->backtrace_size; i--;) {
GB_log(gb, "%3d. %s\n", gb->backtrace_size - i + 1, debugger_value_to_string(gb, (value_t){true, gb->backtrace_returns[i].bank, gb->backtrace_returns[i].addr}, true));
}
return true;
}
static bool ticks(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
STOPPED_ONLY
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
}
GB_log(gb, "Ticks: %lu. (Resetting)\n", gb->debugger_ticks);
gb->debugger_ticks = 0;
return true;
}
static bool palettes(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
{
NO_MODIFIERS
if (strlen(lstrip(arguments))) {
print_usage(gb, command);
return true;
}
if (!gb->is_cgb) {
GB_log(gb, "Not available on a DMG.\n");
return true;
}
GB_log(gb, "Background palettes: \n");
for (unsigned i = 0; i < 32; i++) {
GB_log(gb, "%04x ", ((uint16_t *)&gb->background_palletes_data)[i]);
if (i % 4 == 3) {
GB_log(gb, "\n");
}
}
GB_log(gb, "Sprites palettes: \n");
for (unsigned i = 0; i < 32; i++) {
GB_log(gb, "%04x ", ((uint16_t *)&gb->sprite_palletes_data)[i]);
if (i % 4 == 3) {
GB_log(gb, "\n");
}
}
return true;
}
static bool help(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command);
#define HELP_NEWLINE "\n "
/* Commands without implementations are aliases of the previous non-alias commands */
static const debugger_command_t commands[] = {
{"continue", 1, cont, "Continue running until next stop"},
{"next", 1, next, "Run the next instruction, skipping over function calls"},
{"step", 1, step, "Run the next instruction, stepping into function calls"},
{"finish", 1, finish, "Run until the current function returns"},
{"backtrace", 2, backtrace, "Display the current call stack"},
{"bt", 2, }, /* Alias */
{"sld", 3, stack_leak_detection, "Like finish, but stops if a stack leak is detected (Experimental)"},
{"ticks", 2, ticks, "Display the number of CPU ticks since the last time 'ticks' was used"},
{"registers", 1, registers, "Print values of processor registers and other important registers"},
{"cartridge", 2, mbc, "Displays information about the MBC and cartridge"},
{"mbc", 3, }, /* Alias */
{"palettes", 3, palettes, "Displays the current CGB palettes"},
{"breakpoint", 1, breakpoint, "Add a new breakpoint at the specified address/expression" HELP_NEWLINE
"Can also modify the condition of existing breakpoints.",
"<expression>[ if <condition expression>]"},
{"delete", 2, delete, "Delete a breakpoint by its address, or all breakpoints", "[<expression>]"},
{"watch", 1, watch, "Add a new watchpoint at the specified address/expression." HELP_NEWLINE
"Can also modify the condition and type of existing watchpoints." HELP_NEWLINE
"Default watchpoint type is write-only.",
"<expression>[ if <condition expression>]", "(r|w|rw)"},
{"unwatch", 3, unwatch, "Delete a watchpoint by its address, or all watchpoints", "[<expression>]"},
{"list", 1, list, "List all set breakpoints and watchpoints"},
{"print", 1, print, "Evaluate and print an expression" HELP_NEWLINE
"Use modifier to format as an address (a, default) or as a number in" HELP_NEWLINE
"decimal (d), hexadecimal (x), octal (o) or binary (b).",
"<expression>", "format"},
{"eval", 2, }, /* Alias */
{"examine", 2, examine, "Examine values at address", "<expression>", "count"},
{"x", 1, }, /* Alias */
{"disassemble", 1, disassemble, "Disassemble instructions at address", "<expression>", "count"},
{"help", 1, help, "List available commands or show help for the specified command", "[<command>]"},
{NULL,}, /* Null terminator */
};
static const debugger_command_t *find_command(const char *string)
{
size_t length = strlen(string);
for (const debugger_command_t *command = commands; command->command; command++) {
if (command->min_length > length) continue;
if (memcmp(command->command, string, length) == 0) { /* Is a substring? */
/* Aliases */
while (!command->implementation) {
command--;
}
return command;
}
}
return NULL;
}
static void print_command_shortcut(GB_gameboy_t *gb, const debugger_command_t *command)
{
GB_attributed_log(gb, GB_LOG_BOLD | GB_LOG_UNDERLINE, "%.*s", command->min_length, command->command);
GB_attributed_log(gb, GB_LOG_BOLD , "%s", command->command + command->min_length);
}
static void print_command_description(GB_gameboy_t *gb, const debugger_command_t *command)
{
print_command_shortcut(gb, command);
GB_log(gb, ": ");
GB_log(gb, (const char *)&" %s\n" + strlen(command->command), command->help_string);
}
static bool help(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *ignored)
{
const debugger_command_t *command = find_command(arguments);
if (command) {
print_command_description(gb, command);
GB_log(gb, "\n");
print_usage(gb, command);
command++;
if (command->command && !command->implementation) { /* Command has aliases*/
GB_log(gb, "\nAliases: ");
do {
print_command_shortcut(gb, command);
GB_log(gb, " ");
command++;
} while (command->command && !command->implementation);
GB_log(gb, "\n");
}
return true;
}
for (command = commands; command->command; command++) {
if (command->help_string) {
print_command_description(gb, command);
}
}
return true;
}
void GB_debugger_call_hook(GB_gameboy_t *gb, uint16_t call_addr)
{
/* Called just after the CPU calls a function/enters an interrupt/etc... */
if (gb->stack_leak_detection) {
if (gb->debug_call_depth >= sizeof(gb->sp_for_call_depth) / sizeof(gb->sp_for_call_depth[0])) {
GB_log(gb, "Potential stack overflow detected (Functions nest too much). \n");
gb->debug_stopped = true;
}
else {
gb->sp_for_call_depth[gb->debug_call_depth] = gb->registers[GB_REGISTER_SP];
gb->addr_for_call_depth[gb->debug_call_depth] = gb->pc;
}
}
if (gb->backtrace_size < sizeof(gb->backtrace_sps) / sizeof(gb->backtrace_sps[0])) {
while (gb->backtrace_size) {
if (gb->backtrace_sps[gb->backtrace_size - 1] < gb->registers[GB_REGISTER_SP]) {
gb->backtrace_size--;
}
else {
break;
}
}
gb->backtrace_sps[gb->backtrace_size] = gb->registers[GB_REGISTER_SP];
gb->backtrace_returns[gb->backtrace_size].bank = bank_for_addr(gb, call_addr);
gb->backtrace_returns[gb->backtrace_size].addr = call_addr;
gb->backtrace_size++;
}
gb->debug_call_depth++;
}
void GB_debugger_ret_hook(GB_gameboy_t *gb)
{
/* Called just before the CPU runs ret/reti */
gb->debug_call_depth--;
if (gb->stack_leak_detection) {
if (gb->debug_call_depth < 0) {
GB_log(gb, "Function finished without a stack leak.\n");
gb->debug_stopped = true;
}
else {
if (gb->registers[GB_REGISTER_SP] != gb->sp_for_call_depth[gb->debug_call_depth]) {
GB_log(gb, "Stack leak detected for function %s!\n", value_to_string(gb, gb->addr_for_call_depth[gb->debug_call_depth], true));
GB_log(gb, "SP is $%04x, should be $%04x.\n", gb->registers[GB_REGISTER_SP],
gb->sp_for_call_depth[gb->debug_call_depth]);
gb->debug_stopped = true;
}
}
}
while (gb->backtrace_size) {
if (gb->backtrace_sps[gb->backtrace_size - 1] <= gb->registers[GB_REGISTER_SP]) {
gb->backtrace_size--;
}
else {
break;
}
}
}
static bool _GB_debugger_test_write_watchpoint(GB_gameboy_t *gb, value_t addr, uint8_t value)
{
uint16_t index = find_watchpoint(gb, addr);
uint32_t key = WP_KEY(addr);
if (index < gb->n_watchpoints && gb->watchpoints[index].key == key) {
if (!(gb->watchpoints[index].flags & GB_WATCHPOINT_W)) {
return false;
}
if (!gb->watchpoints[index].condition) {
gb->debug_stopped = true;
GB_log(gb, "Watchpoint: [%s] = $%02x\n", debugger_value_to_string(gb, addr, true), value);
return true;
}
bool error;
bool condition = debugger_evaluate(gb, gb->watchpoints[index].condition,
(unsigned int)strlen(gb->watchpoints[index].condition), &error, &addr.value, &value).value;
if (error) {
/* Should never happen */
GB_log(gb, "An internal error has occured\n");
return false;
}
if (condition) {
gb->debug_stopped = true;
GB_log(gb, "Watchpoint: [%s] = $%02x\n", debugger_value_to_string(gb, addr, true), value);
return true;
}
}
return false;
}
void GB_debugger_test_write_watchpoint(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
{
if (gb->debug_stopped) return;
/* Try any-bank breakpoint */
value_t full_addr = (VALUE_16(addr));
if (_GB_debugger_test_write_watchpoint(gb, full_addr, value)) return;
/* Try bank-specific breakpoint */
full_addr.has_bank = true;
full_addr.bank = bank_for_addr(gb, addr);
_GB_debugger_test_write_watchpoint(gb, full_addr, value);
}
static bool _GB_debugger_test_read_watchpoint(GB_gameboy_t *gb, value_t addr)
{
uint16_t index = find_watchpoint(gb, addr);
uint32_t key = WP_KEY(addr);
if (index < gb->n_watchpoints && gb->watchpoints[index].key == key) {
if (!(gb->watchpoints[index].flags & GB_WATCHPOINT_R)) {
return false;
}
if (!gb->watchpoints[index].condition) {
gb->debug_stopped = true;
GB_log(gb, "Watchpoint: [%s]\n", debugger_value_to_string(gb, addr, true));
return true;
}
bool error;
bool condition = debugger_evaluate(gb, gb->watchpoints[index].condition,
(unsigned int)strlen(gb->watchpoints[index].condition), &error, &addr.value, NULL).value;
if (error) {
/* Should never happen */
GB_log(gb, "An internal error has occured\n");
return false;
}
if (condition) {
gb->debug_stopped = true;
GB_log(gb, "Watchpoint: [%s]\n", debugger_value_to_string(gb, addr, true));
return true;
}
}
return false;
}
void GB_debugger_test_read_watchpoint(GB_gameboy_t *gb, uint16_t addr)
{
if (gb->debug_stopped) return;
/* Try any-bank breakpoint */
value_t full_addr = (VALUE_16(addr));
if (_GB_debugger_test_read_watchpoint(gb, full_addr)) return;
/* Try bank-specific breakpoint */
full_addr.has_bank = true;
full_addr.bank = bank_for_addr(gb, addr);
_GB_debugger_test_read_watchpoint(gb, full_addr);
}
/* Returns true if debugger waits for more commands */
bool GB_debugger_do_command(GB_gameboy_t *gb, char *input)
{
if (!input[0]) {
return true;
}
char *command_string = input;
char *arguments = strchr(input, ' ');
if (arguments) {
/* Actually "split" the string. */
arguments[0] = 0;
arguments++;
}
else {
arguments = "";
}
char *modifiers = strchr(command_string, '/');
if (modifiers) {
/* Actually "split" the string. */
modifiers[0] = 0;
modifiers++;
}
const debugger_command_t *command = find_command(command_string);
if (command) {
return command->implementation(gb, arguments, modifiers, command);
}
else {
GB_log(gb, "%s: no such command.\n", command_string);
return true;
}
}
void GB_debugger_run(GB_gameboy_t *gb)
{
if (gb->debug_disable) return;
char *input = NULL;
if (gb->debug_next_command && gb->debug_call_depth <= 0) {
gb->debug_stopped = true;
}
if (gb->debug_fin_command && gb->debug_call_depth == -1) {
gb->debug_stopped = true;
}
if (gb->debug_stopped) {
GB_cpu_disassemble(gb, gb->pc, 5);
}
next_command:
if (input) {
free(input);
}
if (gb->breakpoints && !gb->debug_stopped && should_break(gb, gb->pc)) {
gb->debug_stopped = true;
GB_log(gb, "Breakpoint: PC = %s\n", value_to_string(gb, gb->pc, true));
GB_cpu_disassemble(gb, gb->pc, 5);
}
if (gb->debug_stopped && !gb->debug_disable) {
gb->debug_next_command = false;
gb->debug_fin_command = false;
gb->stack_leak_detection = false;
input = gb->input_callback(gb);
if (GB_debugger_do_command(gb, input)) {
goto next_command;
}
free(input);
}
}
void GB_debugger_handle_async_commands(GB_gameboy_t *gb)
{
char *input = NULL;
while (gb->async_input_callback && (input = gb->async_input_callback(gb))) {
GB_debugger_do_command(gb, input);
free(input);
}
}
void GB_debugger_load_symbol_file(GB_gameboy_t *gb, const char *path)
{
FILE *f = fopen(path, "r");
if (!f) return;
char *line = NULL;
size_t size = 0;
size_t length = 0;
while ((length = getline(&line, &size, f)) != -1) {
for (unsigned i = 0; i < length; i++) {
if (line[i] == ';' || line[i] == '\n' || line[i] == '\r') {
line[i] = 0;
length = i;
break;
}
}
if (length == 0) continue;
unsigned int bank, address;
char symbol[length];
if (sscanf(line, "%02x:%04x %s", &bank, &address, symbol) == 3) {
bank &= 0x1FF;
if (!gb->bank_symbols[bank]) {
gb->bank_symbols[bank] = GB_map_alloc();
}
GB_bank_symbol_t *allocated_symbol = GB_map_add_symbol(gb->bank_symbols[bank], address, symbol);
if (allocated_symbol) {
GB_reversed_map_add_symbol(&gb->reversed_symbol_map, bank, allocated_symbol);
}
}
}
free(line);
fclose(f);
}
const GB_bank_symbol_t *GB_debugger_find_symbol(GB_gameboy_t *gb, uint16_t addr)
{
uint16_t bank = bank_for_addr(gb, addr);
const GB_bank_symbol_t *symbol = GB_map_find_symbol(gb->bank_symbols[bank], addr);
if (symbol) return symbol;
if (bank != 0) return GB_map_find_symbol(gb->bank_symbols[0], addr); /* Maybe the symbol incorrectly uses bank 0? */
return NULL;
}
const char *GB_debugger_name_for_address(GB_gameboy_t *gb, uint16_t addr)
{
const GB_bank_symbol_t *symbol = GB_debugger_find_symbol(gb, addr);
if (symbol && symbol->addr == addr) return symbol->name;
return NULL;
}
/* The public version of debugger_evaluate */
bool GB_debugger_evaluate(GB_gameboy_t *gb, const char *string, uint16_t *result, uint16_t *result_bank)
{
bool error = false;
value_t value = debugger_evaluate(gb, string, strlen(string), &error, NULL, NULL);
if (result) {
*result = value.value;
}
if (result_bank) {
*result_bank = value.has_bank? value.value : -1;
}
return error;
}
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