1/* Copyright (c) 2013-2014 Jeffrey Pfau
  2 *
  3 * This Source Code Form is subject to the terms of the Mozilla Public
  4 * License, v. 2.0. If a copy of the MPL was not distributed with this
  5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
  6#include "debugger.h"
  7
  8#include "arm.h"
  9
 10#include "memory-debugger.h"
 11
 12const uint32_t ARM_DEBUGGER_ID = 0xDEADBEEF;
 13
 14static void _checkBreakpoints(struct ARMDebugger* debugger) {
 15	struct DebugBreakpoint* breakpoint;
 16	int instructionLength;
 17	enum ExecutionMode mode = debugger->cpu->cpsr.t;
 18	if (mode == MODE_ARM) {
 19		instructionLength = WORD_SIZE_ARM;
 20	} else {
 21		instructionLength = WORD_SIZE_THUMB;
 22	}
 23	for (breakpoint = debugger->breakpoints; breakpoint; breakpoint = breakpoint->next) {
 24		if (breakpoint->address + instructionLength == (uint32_t) debugger->cpu->gprs[ARM_PC]) {
 25			ARMDebuggerEnter(debugger, DEBUGGER_ENTER_BREAKPOINT);
 26			break;
 27		}
 28	}
 29}
 30
 31static void ARMDebuggerInit(struct ARMCore*, struct ARMComponent*);
 32static void ARMDebuggerDeinit(struct ARMComponent*);
 33
 34void ARMDebuggerCreate(struct ARMDebugger* debugger) {
 35	debugger->d.id = ARM_DEBUGGER_ID;
 36	debugger->d.init = ARMDebuggerInit;
 37	debugger->d.deinit = ARMDebuggerDeinit;
 38}
 39
 40void ARMDebuggerInit(struct ARMCore* cpu, struct ARMComponent* component) {
 41	struct ARMDebugger* debugger = (struct ARMDebugger*) component;
 42	debugger->cpu = cpu;
 43	debugger->state = DEBUGGER_RUNNING;
 44	debugger->breakpoints = 0;
 45	debugger->originalMemory = cpu->memory;
 46	debugger->watchpoints = 0;
 47	if (debugger->init) {
 48		debugger->init(debugger);
 49	}
 50}
 51
 52void ARMDebuggerDeinit(struct ARMComponent* component) {
 53	struct ARMDebugger* debugger = (struct ARMDebugger*) component;
 54	debugger->deinit(debugger);
 55}
 56
 57void ARMDebuggerRun(struct ARMDebugger* debugger) {
 58	switch (debugger->state) {
 59	case DEBUGGER_RUNNING:
 60		if (!debugger->breakpoints && !debugger->watchpoints) {
 61			ARMRunLoop(debugger->cpu);
 62		} else {
 63			ARMRun(debugger->cpu);
 64			_checkBreakpoints(debugger);
 65		}
 66		break;
 67	case DEBUGGER_CUSTOM:
 68		ARMRun(debugger->cpu);
 69		_checkBreakpoints(debugger);
 70		debugger->custom(debugger);
 71		break;
 72	case DEBUGGER_PAUSED:
 73		if (debugger->paused) {
 74			debugger->paused(debugger);
 75		} else {
 76			debugger->state = DEBUGGER_RUNNING;
 77		}
 78		break;
 79	case DEBUGGER_SHUTDOWN:
 80		return;
 81	}
 82}
 83
 84void ARMDebuggerEnter(struct ARMDebugger* debugger, enum DebuggerEntryReason reason) {
 85	debugger->state = DEBUGGER_PAUSED;
 86	if (debugger->entered) {
 87		debugger->entered(debugger, reason);
 88	}
 89}
 90
 91void ARMDebuggerSetBreakpoint(struct ARMDebugger* debugger, uint32_t address) {
 92	struct DebugBreakpoint* breakpoint = malloc(sizeof(struct DebugBreakpoint));
 93	breakpoint->address = address;
 94	breakpoint->next = debugger->breakpoints;
 95	debugger->breakpoints = breakpoint;
 96}
 97
 98void ARMDebuggerClearBreakpoint(struct ARMDebugger* debugger, uint32_t address) {
 99	struct DebugBreakpoint** previous = &debugger->breakpoints;
100	struct DebugBreakpoint* breakpoint;
101	for (; (breakpoint = *previous); previous = &breakpoint->next) {
102		if (breakpoint->address == address) {
103			*previous = breakpoint->next;
104			free(breakpoint);
105		}
106	}
107}
108
109void ARMDebuggerSetWatchpoint(struct ARMDebugger* debugger, uint32_t address) {
110	if (!debugger->watchpoints) {
111		ARMDebuggerInstallMemoryShim(debugger);
112	}
113	struct DebugBreakpoint* watchpoint = malloc(sizeof(struct DebugBreakpoint));
114	watchpoint->address = address;
115	watchpoint->next = debugger->watchpoints;
116	debugger->watchpoints = watchpoint;
117}
118
119void ARMDebuggerClearWatchpoint(struct ARMDebugger* debugger, uint32_t address) {
120	struct DebugBreakpoint** previous = &debugger->watchpoints;
121	struct DebugBreakpoint* breakpoint;
122	for (; (breakpoint = *previous); previous = &breakpoint->next) {
123		if (breakpoint->address == address) {
124			*previous = breakpoint->next;
125			free(breakpoint);
126		}
127	}
128	if (!debugger->watchpoints) {
129		ARMDebuggerRemoveMemoryShim(debugger);
130	}
131}