//
//  SentryCrashCPU_arm.c
//
//  Created by Karl Stenerud on 2012-01-29.
//
//  Copyright (c) 2012 Karl Stenerud. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall remain in place
// in this source code.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#if defined (__arm__)


#include "SentryCrashCPU.h"
#include "SentryCrashCPU_Apple.h"
#include "SentryCrashMachineContext.h"
#include "SentryCrashMachineContext_Apple.h"
#include <stdlib.h>

//#define SentryCrashLogger_LocalLevel TRACE
#include "SentryCrashLogger.h"


static const char* g_registerNames[] =
{
    "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
    "r8", "r9", "r10", "r11", "ip",
    "sp", "lr", "pc", "cpsr"
};
static const int g_registerNamesCount =
sizeof(g_registerNames) / sizeof(*g_registerNames);


static const char* g_exceptionRegisterNames[] =
{
    "exception", "fsr", "far"
};
static const int g_exceptionRegisterNamesCount =
sizeof(g_exceptionRegisterNames) / sizeof(*g_exceptionRegisterNames);


uintptr_t sentrycrashcpu_framePointer(const SentryCrashMachineContext* const context)
{
    return context->machineContext.__ss.__r[7];
}

uintptr_t sentrycrashcpu_stackPointer(const SentryCrashMachineContext* const context)
{
    return context->machineContext.__ss.__sp;
}

uintptr_t sentrycrashcpu_instructionAddress(const SentryCrashMachineContext* const context)
{
    return context->machineContext.__ss.__pc;
}

uintptr_t sentrycrashcpu_linkRegister(const SentryCrashMachineContext* const context)
{
    return context->machineContext.__ss.__lr;
}

void sentrycrashcpu_getState(SentryCrashMachineContext* context)
{
    thread_t thread = context->thisThread;
    STRUCT_MCONTEXT_L* const machineContext = &context->machineContext;

    sentrycrashcpu_i_fillState(thread, (thread_state_t)&machineContext->__ss, ARM_THREAD_STATE, ARM_THREAD_STATE_COUNT);
    sentrycrashcpu_i_fillState(thread, (thread_state_t)&machineContext->__es, ARM_EXCEPTION_STATE, ARM_EXCEPTION_STATE_COUNT);
}

int sentrycrashcpu_numRegisters(void)
{
    return g_registerNamesCount;
}

const char* sentrycrashcpu_registerName(const int regNumber)
{
    if(regNumber < sentrycrashcpu_numRegisters())
    {
        return g_registerNames[regNumber];
    }
    return NULL;
}

uint64_t sentrycrashcpu_registerValue(const SentryCrashMachineContext* const context, const int regNumber)
{
    if(regNumber <= 12)
    {
        return context->machineContext.__ss.__r[regNumber];
    }

    switch(regNumber)
    {
        case 13: return context->machineContext.__ss.__sp;
        case 14: return context->machineContext.__ss.__lr;
        case 15: return context->machineContext.__ss.__pc;
        case 16: return context->machineContext.__ss.__cpsr;
    }

    SentryCrashLOG_ERROR("Invalid register number: %d", regNumber);
    return 0;
}

int sentrycrashcpu_numExceptionRegisters(void)
{
    return g_exceptionRegisterNamesCount;
}

const char* sentrycrashcpu_exceptionRegisterName(const int regNumber)
{
    if(regNumber < sentrycrashcpu_numExceptionRegisters())
    {
        return g_exceptionRegisterNames[regNumber];
    }
    SentryCrashLOG_ERROR("Invalid register number: %d", regNumber);
    return NULL;
}

uint64_t sentrycrashcpu_exceptionRegisterValue(const SentryCrashMachineContext* const context, const int regNumber)
{
    switch(regNumber)
    {
        case 0:
            return context->machineContext.__es.__exception;
        case 1:
            return context->machineContext.__es.__fsr;
        case 2:
            return context->machineContext.__es.__far;
    }

    SentryCrashLOG_ERROR("Invalid register number: %d", regNumber);
    return 0;
}

uintptr_t sentrycrashcpu_faultAddress(const SentryCrashMachineContext* const context)
{
    return context->machineContext.__es.__far;
}

int sentrycrashcpu_stackGrowDirection(void)
{
    return -1;
}

uintptr_t sentrycrashcpu_normaliseInstructionPointer(uintptr_t ip)
{
    return ip;
}

#endif