Implemented jump-to breakpoints
This commit is contained in:
Lior Halphon
parent
19f42d5a3a
commit
05cd81b77c
311
Core/debugger.c
311
Core/debugger.c
@ -34,6 +34,7 @@ struct GB_breakpoint_s {
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uint32_t key; /* For sorting and comparing */
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};
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char *condition;
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bool is_jump_to;
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};
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#define BP_KEY(x) (((struct GB_breakpoint_s){.addr = ((x).value), .bank = (x).has_bank? (x).bank : -1 }).key)
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@ -845,7 +846,15 @@ static uint16_t find_breakpoint(GB_gameboy_t *gb, value_t addr)
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static bool breakpoint(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
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{
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NO_MODIFIERS
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bool is_jump_to = true;
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if (!modifiers) {
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is_jump_to = false;
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}
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else if (strcmp(modifiers, "j") != 0) {
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print_usage(gb, command);
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return true;
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}
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if (strlen(lstrip(arguments)) == 0) {
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print_usage(gb, command);
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return true;
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@ -905,6 +914,12 @@ static bool breakpoint(GB_gameboy_t *gb, char *arguments, char *modifiers, const
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}
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gb->n_breakpoints++;
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gb->breakpoints[index].is_jump_to = is_jump_to;
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if (is_jump_to) {
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gb->has_jump_to_breakpoints = true;
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}
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GB_log(gb, "Breakpoint set at %s\n", debugger_value_to_string(gb, result, true));
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return true;
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}
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@ -955,6 +970,16 @@ static bool delete(GB_gameboy_t *gb, char *arguments, char *modifiers, const deb
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free(gb->breakpoints[index].condition);
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}
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if (gb->breakpoints[index].is_jump_to) {
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gb->has_jump_to_breakpoints = false;
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for (unsigned i = 0; i < gb->n_breakpoints; i++) {
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if (i == index) continue;
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if (gb->breakpoints[i].is_jump_to) {
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gb->has_jump_to_breakpoints = true;
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break;
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}
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}
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}
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memmove(&gb->breakpoints[index], &gb->breakpoints[index + 1], (gb->n_breakpoints - index - 1) * sizeof(gb->breakpoints[0]));
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gb->n_breakpoints--;
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@ -1152,12 +1177,15 @@ static bool list(GB_gameboy_t *gb, char *arguments, char *modifiers, const debug
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for (uint16_t i = 0; i < gb->n_breakpoints; i++) {
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value_t addr = (value_t){gb->breakpoints[i].bank != (uint16_t)-1, gb->breakpoints[i].bank, gb->breakpoints[i].addr};
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if (gb->breakpoints[i].condition) {
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GB_log(gb, " %d. %s (Condition: %s)\n", i + 1,
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GB_log(gb, " %d. %s (%sCondition: %s)\n", i + 1,
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debugger_value_to_string(gb, addr, addr.has_bank),
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gb->breakpoints[i].is_jump_to? "Jump to, ": "",
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gb->breakpoints[i].condition);
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}
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else {
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GB_log(gb, " %d. %s\n", i + 1, debugger_value_to_string(gb, addr, addr.has_bank));
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GB_log(gb, " %d. %s%s\n", i + 1,
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debugger_value_to_string(gb, addr, addr.has_bank),
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gb->breakpoints[i].is_jump_to? " (Jump to)" : "");
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}
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}
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}
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@ -1186,12 +1214,12 @@ static bool list(GB_gameboy_t *gb, char *arguments, char *modifiers, const debug
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return true;
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}
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static bool _should_break(GB_gameboy_t *gb, value_t addr)
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static bool _should_break(GB_gameboy_t *gb, value_t addr, bool jump_to)
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{
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uint16_t index = find_breakpoint(gb, addr);
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uint32_t key = BP_KEY(addr);
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if (index < gb->n_breakpoints && gb->breakpoints[index].key == key) {
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if (index < gb->n_breakpoints && gb->breakpoints[index].key == key && gb->breakpoints[index].is_jump_to == jump_to) {
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if (!gb->breakpoints[index].condition) {
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return true;
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}
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@ -1208,16 +1236,16 @@ static bool _should_break(GB_gameboy_t *gb, value_t addr)
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return false;
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}
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static bool should_break(GB_gameboy_t *gb, uint16_t addr)
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static bool should_break(GB_gameboy_t *gb, uint16_t addr, bool jump_to)
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{
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/* Try any-bank breakpoint */
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value_t full_addr = (VALUE_16(addr));
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if (_should_break(gb, full_addr)) return true;
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if (_should_break(gb, full_addr, jump_to)) return true;
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/* Try bank-specific breakpoint */
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full_addr.has_bank = true;
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full_addr.bank = bank_for_addr(gb, addr);
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return _should_break(gb, full_addr);
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return _should_break(gb, full_addr, jump_to);
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}
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static bool print(GB_gameboy_t *gb, char *arguments, char *modifiers, const debugger_command_t *command)
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@ -1562,8 +1590,10 @@ static const debugger_command_t commands[] = {
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{"lcd", 3, lcd, "Displays information about the current state of the LCD controller"},
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{"palettes", 3, palettes, "Displays the current CGB palettes"},
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{"breakpoint", 1, breakpoint, "Add a new breakpoint at the specified address/expression" HELP_NEWLINE
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"Can also modify the condition of existing breakpoints.",
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"<expression>[ if <condition expression>]"},
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"Can also modify the condition of existing breakpoints." HELP_NEWLINE
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"If the j modifier is used, the breakpoint will occur just" HELP_NEWLINE
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"before jumping to the target.",
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"<expression>[ if <condition expression>]", "(j)"},
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{"delete", 2, delete, "Delete a breakpoint by its address, or all breakpoints", "[<expression>]"},
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{"watch", 1, watch, "Add a new watchpoint at the specified address/expression." HELP_NEWLINE
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"Can also modify the condition and type of existing watchpoints." HELP_NEWLINE
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@ -1834,6 +1864,14 @@ bool GB_debugger_execute_command(GB_gameboy_t *gb, char *input)
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}
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}
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typedef enum {
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JUMP_TO_NONE,
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JUMP_TO_BREAK,
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JUMP_TO_NONTRIVIAL,
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} jump_to_return_t;
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static jump_to_return_t test_jump_to_breakpoints(GB_gameboy_t *gb, uint16_t *address);
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void GB_debugger_run(GB_gameboy_t *gb)
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{
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if (gb->debug_disable) return;
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@ -1852,11 +1890,55 @@ next_command:
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if (input) {
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free(input);
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}
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if (gb->breakpoints && !gb->debug_stopped && should_break(gb, gb->pc)) {
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if (gb->breakpoints && !gb->debug_stopped && should_break(gb, gb->pc, false)) {
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gb->debug_stopped = true;
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GB_log(gb, "Breakpoint: PC = %s\n", value_to_string(gb, gb->pc, true));
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GB_cpu_disassemble(gb, gb->pc, 5);
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}
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if (gb->breakpoints && !gb->debug_stopped) {
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uint16_t address = 0;
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jump_to_return_t jump_to_result = test_jump_to_breakpoints(gb, &address);
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bool should_delete_state = true;
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if (gb->nontrivial_jump_state && should_break(gb, gb->pc, true)) {
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if (gb->non_trivial_jump_breakpoint_occured) {
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gb->non_trivial_jump_breakpoint_occured = false;
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}
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else {
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gb->non_trivial_jump_breakpoint_occured = true;
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GB_log(gb, "Jumping to breakpoint: PC = %s\n", value_to_string(gb, gb->pc, true));
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GB_cpu_disassemble(gb, gb->pc, 5);
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GB_load_state_from_buffer(gb, gb->nontrivial_jump_state, -1);
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gb->debug_stopped = true;
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}
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}
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else if (jump_to_result == JUMP_TO_BREAK) {
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gb->debug_stopped = true;
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GB_log(gb, "Jumping to breakpoint: PC = %s\n", value_to_string(gb, address, true));
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GB_cpu_disassemble(gb, gb->pc, 5);
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gb->non_trivial_jump_breakpoint_occured = false;
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}
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else if (jump_to_result == JUMP_TO_NONTRIVIAL) {
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if (!gb->nontrivial_jump_state) {
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gb->nontrivial_jump_state = malloc(GB_get_save_state_size(gb));
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}
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GB_save_state_to_buffer(gb, gb->nontrivial_jump_state);
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gb->non_trivial_jump_breakpoint_occured = false;
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should_delete_state = false;
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}
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else {
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gb->non_trivial_jump_breakpoint_occured = false;
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}
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if (should_delete_state) {
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if (gb->nontrivial_jump_state) {
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free(gb->nontrivial_jump_state);
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gb->nontrivial_jump_state = NULL;
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}
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}
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}
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if (gb->debug_stopped && !gb->debug_disable) {
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gb->debug_next_command = false;
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gb->debug_fin_command = false;
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@ -1986,3 +2068,210 @@ void GB_debugger_set_disabled(GB_gameboy_t *gb, bool disabled)
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{
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gb->debug_disable = disabled;
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}
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/* Jump-to breakpoints */
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static bool is_in_trivial_memory(uint16_t addr)
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{
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/* ROM */
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if (addr < 0x8000) {
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return true;
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}
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/* HRAM */
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if (addr >= 0xFF80 && addr < 0xFFFF) {
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return true;
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}
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/* RAM */
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if (addr >= 0xC000 && addr < 0xE000) {
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return true;
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}
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return false;
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}
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typedef uint16_t GB_opcode_address_getter_t(GB_gameboy_t *gb, uint8_t opcode);
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uint16_t trivial_1(GB_gameboy_t *gb, uint8_t opcode)
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{
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return gb->pc + 1;
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}
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uint16_t trivial_2(GB_gameboy_t *gb, uint8_t opcode)
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{
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return gb->pc + 2;
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}
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uint16_t trivial_3(GB_gameboy_t *gb, uint8_t opcode)
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{
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return gb->pc + 3;
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}
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static uint16_t jr_r8(GB_gameboy_t *gb, uint8_t opcode)
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{
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return gb->pc + 2 + (int8_t)GB_read_memory(gb, gb->pc + 1);
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}
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static bool condition_code(GB_gameboy_t *gb, uint8_t opcode)
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{
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switch ((opcode >> 3) & 0x3) {
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case 0:
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return !(gb->registers[GB_REGISTER_AF] & GB_ZERO_FLAG);
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case 1:
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return (gb->registers[GB_REGISTER_AF] & GB_ZERO_FLAG);
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case 2:
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return !(gb->registers[GB_REGISTER_AF] & GB_CARRY_FLAG);
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case 3:
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return (gb->registers[GB_REGISTER_AF] & GB_CARRY_FLAG);
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}
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return false;
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}
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static uint16_t jr_cc_r8(GB_gameboy_t *gb, uint8_t opcode)
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{
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if (!condition_code(gb, opcode)) {
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return gb->pc + 2;
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}
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return gb->pc + 2 + (int8_t)GB_read_memory(gb, gb->pc + 1);
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}
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static uint16_t ret(GB_gameboy_t *gb, uint8_t opcode)
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{
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return GB_read_memory(gb, gb->registers[GB_REGISTER_SP]) |
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(GB_read_memory(gb, gb->registers[GB_REGISTER_SP] + 1) << 8);
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}
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static uint16_t ret_cc(GB_gameboy_t *gb, uint8_t opcode)
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{
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if (condition_code(gb, opcode)) {
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return ret(gb, opcode);
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}
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else {
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return gb->pc + 1;
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}
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}
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static uint16_t jp_a16(GB_gameboy_t *gb, uint8_t opcode)
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{
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return GB_read_memory(gb, gb->pc + 1) |
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(GB_read_memory(gb, gb->pc + 2) << 8);
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}
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static uint16_t jp_cc_a16(GB_gameboy_t *gb, uint8_t opcode)
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{
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if (condition_code(gb, opcode)) {
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return jp_a16(gb, opcode);
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}
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else {
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return gb->pc + 3;
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}
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}
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static uint16_t rst(GB_gameboy_t *gb, uint8_t opcode)
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{
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return opcode ^ 0xC7;
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}
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static uint16_t jp_hl(GB_gameboy_t *gb, uint8_t opcode)
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{
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return gb->hl;
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}
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static GB_opcode_address_getter_t *opcodes[256] = {
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/* X0 X1 X2 X3 X4 X5 X6 X7 */
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/* X8 X9 Xa Xb Xc Xd Xe Xf */
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trivial_1, trivial_3, trivial_1, trivial_1, trivial_1, trivial_1, trivial_2, trivial_1, /* 0X */
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trivial_3, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_2, trivial_1,
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trivial_2, trivial_3, trivial_1, trivial_1, trivial_1, trivial_1, trivial_2, trivial_1, /* 1X */
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jr_r8, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_2, trivial_1,
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jr_cc_r8, trivial_3, trivial_1, trivial_1, trivial_1, trivial_1, trivial_2, trivial_1, /* 2X */
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jr_cc_r8, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_2, trivial_1,
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jr_cc_r8, trivial_3, trivial_1, trivial_1, trivial_1, trivial_1, trivial_2, trivial_1, /* 3X */
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jr_cc_r8, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_2, trivial_1,
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, /* 4X */
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1,
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, /* 5X */
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1,
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, /* 6X */
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1,
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, NULL, trivial_1, /* 7X */
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1,
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, /* 8X */
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1,
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, /* 9X */
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1,
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, /* aX */
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1,
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, /* bX */
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trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1, trivial_1,
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ret_cc, trivial_1, jp_cc_a16, jp_a16, jp_cc_a16, trivial_1, trivial_2, rst, /* cX */
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ret_cc, ret, jp_cc_a16, trivial_2, jp_cc_a16, jp_a16, trivial_2, rst,
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ret_cc, trivial_1, jp_cc_a16, NULL, jp_cc_a16, trivial_1, trivial_2, rst, /* dX */
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ret_cc, ret, jp_cc_a16, NULL, jp_cc_a16, NULL, trivial_2, rst,
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trivial_2, trivial_1, trivial_1, NULL, NULL, trivial_1, trivial_2, rst, /* eX */
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trivial_2, jp_hl, trivial_3, NULL, NULL, NULL, trivial_2, rst,
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trivial_2, trivial_1, trivial_1, trivial_1, NULL, trivial_1, trivial_2, rst, /* fX */
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trivial_2, trivial_1, trivial_3, trivial_1, NULL, NULL, trivial_2, rst,
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};
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static jump_to_return_t test_jump_to_breakpoints(GB_gameboy_t *gb, uint16_t *address)
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{
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if (!gb->has_jump_to_breakpoints) return JUMP_TO_NONE;
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if (!is_in_trivial_memory(gb->pc) || !is_in_trivial_memory(gb->pc + 2) ||
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!is_in_trivial_memory(gb->registers[GB_REGISTER_SP]) || !is_in_trivial_memory(gb->registers[GB_REGISTER_SP] + 1)) {
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return JUMP_TO_NONTRIVIAL;
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}
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/* Interrupts */
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if (gb->ime) {
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for (unsigned i = 0; i < 5; i++) {
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if ((gb->interrupt_enable & (1 << i)) && (gb->io_registers[GB_IO_IF] & (1 << i))) {
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if (should_break(gb, 0x40 + i * 8, true)) {
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if (address) {
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*address = 0x40 + i * 8;
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}
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return JUMP_TO_BREAK;
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}
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}
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}
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}
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uint16_t n_watchpoints = gb->n_watchpoints;
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gb->n_watchpoints = 0;
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uint8_t opcode = GB_read_memory(gb, gb->pc);
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if (opcode == 0x76) {
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gb->n_watchpoints = n_watchpoints;
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if (gb->ime) { /* Already handled in above */
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return JUMP_TO_NONE;
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}
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if (gb->interrupt_enable & gb->io_registers[GB_IO_IF] & 0x1F) {
|
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return JUMP_TO_NONTRIVIAL; /* HALT bug could occur */
|
||||
}
|
||||
|
||||
return JUMP_TO_NONE;
|
||||
}
|
||||
|
||||
GB_opcode_address_getter_t *getter = opcodes[opcode];
|
||||
if (!getter) {
|
||||
gb->n_watchpoints = n_watchpoints;
|
||||
return JUMP_TO_NONE;
|
||||
}
|
||||
|
||||
uint16_t new_pc = getter(gb, opcode);
|
||||
|
||||
gb->n_watchpoints = n_watchpoints;
|
||||
|
||||
if (address) {
|
||||
*address = new_pc;
|
||||
}
|
||||
|
||||
return should_break(gb, new_pc, true) ? JUMP_TO_BREAK : JUMP_TO_NONE;
|
||||
}
|
||||
|
||||
@ -142,6 +142,9 @@ void GB_free(GB_gameboy_t *gb)
|
||||
if (gb->sgb) {
|
||||
free(gb->sgb);
|
||||
}
|
||||
if (gb->nontrivial_jump_state) {
|
||||
free(gb->nontrivial_jump_state);
|
||||
}
|
||||
#ifndef DISABLE_DEBUGGER
|
||||
GB_debugger_clear_symbols(gb);
|
||||
#endif
|
||||
@ -689,6 +692,11 @@ void GB_reset(GB_gameboy_t *gb)
|
||||
|
||||
GB_apu_update_cycles_per_sample(gb);
|
||||
|
||||
if (gb->nontrivial_jump_state) {
|
||||
free(gb->nontrivial_jump_state);
|
||||
gb->nontrivial_jump_state = NULL;
|
||||
}
|
||||
|
||||
gb->magic = (uintptr_t)'SAME';
|
||||
}
|
||||
|
||||
|
||||
@ -531,6 +531,9 @@ struct GB_gameboy_internal_s {
|
||||
/* Breakpoints */
|
||||
uint16_t n_breakpoints;
|
||||
struct GB_breakpoint_s *breakpoints;
|
||||
bool has_jump_to_breakpoints;
|
||||
void *nontrivial_jump_state;
|
||||
bool non_trivial_jump_breakpoint_occured;
|
||||
|
||||
/* SLD (Todo: merge with backtrace) */
|
||||
bool stack_leak_detection;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user