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Rudimentary breakpoints

This commit is contained in:
Jeffrey Pfau 2013-04-14 02:42:09 -07:00
parent baad7b50bd
commit 76a85c763c
1 changed files with 48 additions and 3 deletions
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51
src/debugger.c
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@ -23,6 +23,11 @@ struct DebugVector {
};
};
struct DebugBreakpoint {
struct DebugBreakpoint* next;
int32_t address;
};
static const char* ERROR_MISSING_ARGS = "Arguments missing";
typedef void (DebuggerComamnd)(struct ARMDebugger*, struct DebugVector*);
@ -33,15 +38,18 @@ static void _next(struct ARMDebugger*, struct DebugVector*);
static void _print(struct ARMDebugger*, struct DebugVector*);
static void _printHex(struct ARMDebugger*, struct DebugVector*);
static void _printStatus(struct ARMDebugger*, struct DebugVector*);
static void _quit(struct ARMDebugger*, struct DebugVector*);
static void _readByte(struct ARMDebugger*, struct DebugVector*);
static void _readHalfword(struct ARMDebugger*, struct DebugVector*);
static void _readWord(struct ARMDebugger*, struct DebugVector*);
static void _quit(struct ARMDebugger*, struct DebugVector*);
static void _setBreakpoint(struct ARMDebugger*, struct DebugVector*);
struct {
const char* name;
DebuggerComamnd* command;
} debuggerCommands[] = {
{ "b", _setBreakpoint },
{ "break", _setBreakpoint },
{ "c", _continue },
{ "continue", _continue },
{ "i", _printStatus },
@ -179,6 +187,36 @@ static void _readWord(struct ARMDebugger* debugger, struct DebugVector* dv) {
printf(" 0x%08X\n", value);
}
static void _setBreakpoint(struct ARMDebugger* debugger, struct DebugVector* dv) {
if (!dv || dv->type != INT_TYPE) {
printf("%s\n", ERROR_MISSING_ARGS);
return;
}
uint32_t address = dv->intValue;
struct DebugBreakpoint* breakpoint = malloc(sizeof(struct DebugBreakpoint));
breakpoint->address = address;
breakpoint->next = debugger->breakpoints;
debugger->breakpoints = breakpoint;
}
static void _checkBreakpoints(struct ARMDebugger* debugger) {
struct DebugBreakpoint* breakpoint;
int instructionLength;
enum ExecutionMode mode = debugger->cpu->cpsr.t;
if (mode == MODE_ARM) {
instructionLength = WORD_SIZE_ARM;
} else {
instructionLength = WORD_SIZE_THUMB;
}
for (breakpoint = debugger->breakpoints; breakpoint; breakpoint = breakpoint->next) {
if (breakpoint->address + instructionLength == debugger->cpu->gprs[ARM_PC]) {
debugger->state = DEBUGGER_PAUSED;
printf("Hit breakpoint\n");
break;
}
}
}
enum _DVParseState {
PARSE_ERROR = -1,
PARSE_ROOT = 0,
@ -487,8 +525,15 @@ void ARMDebuggerInit(struct ARMDebugger* debugger, struct ARMCore* cpu) {
void ARMDebuggerRun(struct ARMDebugger* debugger) {
while (debugger->state != DEBUGGER_EXITING) {
while (debugger->state == DEBUGGER_RUNNING) {
ARMRun(debugger->cpu);
if (!debugger->breakpoints) {
while (debugger->state == DEBUGGER_RUNNING) {
ARMRun(debugger->cpu);
}
} else {
while (debugger->state == DEBUGGER_RUNNING) {
ARMRun(debugger->cpu);
_checkBreakpoints(debugger);
}
}
switch (debugger->state) {
case DEBUGGER_PAUSED: