// Adapted from: https://github.com/kstenerud/KSCrash
//
//  SentryCrashCPU_x86_64.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(__x86_64__)

#    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[] = { "rax", "rbx", "rcx", "rdx", "rdi", "rsi", "rbp", "rsp",
    "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "rip", "rflags", "cs", "fs", "gs" };
static const int g_registerNamesCount = sizeof(g_registerNames) / sizeof(*g_registerNames);

static const char *g_exceptionRegisterNames[] = { "trapno", "err", "faultvaddr" };
static const int g_exceptionRegisterNamesCount
    = sizeof(g_exceptionRegisterNames) / sizeof(*g_exceptionRegisterNames);

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

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

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

uintptr_t
sentrycrashcpu_linkRegister(__unused const SentryCrashMachineContext *const context)
{
    return 0;
}

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, x86_THREAD_STATE64,
        x86_THREAD_STATE64_COUNT);
    sentrycrashcpu_i_fillState(thread, (thread_state_t)&machineContext->__es, x86_EXCEPTION_STATE64,
        x86_EXCEPTION_STATE64_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)
{
    switch (regNumber) {
    case 0:
        return context->machineContext.__ss.__rax;
    case 1:
        return context->machineContext.__ss.__rbx;
    case 2:
        return context->machineContext.__ss.__rcx;
    case 3:
        return context->machineContext.__ss.__rdx;
    case 4:
        return context->machineContext.__ss.__rdi;
    case 5:
        return context->machineContext.__ss.__rsi;
    case 6:
        return context->machineContext.__ss.__rbp;
    case 7:
        return context->machineContext.__ss.__rsp;
    case 8:
        return context->machineContext.__ss.__r8;
    case 9:
        return context->machineContext.__ss.__r9;
    case 10:
        return context->machineContext.__ss.__r10;
    case 11:
        return context->machineContext.__ss.__r11;
    case 12:
        return context->machineContext.__ss.__r12;
    case 13:
        return context->machineContext.__ss.__r13;
    case 14:
        return context->machineContext.__ss.__r14;
    case 15:
        return context->machineContext.__ss.__r15;
    case 16:
        return context->machineContext.__ss.__rip;
    case 17:
        return context->machineContext.__ss.__rflags;
    case 18:
        return context->machineContext.__ss.__cs;
    case 19:
        return context->machineContext.__ss.__fs;
    case 20:
        return context->machineContext.__ss.__gs;
    }

    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.__trapno;
    case 1:
        return context->machineContext.__es.__err;
    case 2:
        return context->machineContext.__es.__faultvaddr;
    }

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

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

int
sentrycrashcpu_stackGrowDirection(void)
{
    return -1;
}

uintptr_t
sentrycrashcpu_normaliseInstructionPointer(uintptr_t ip)
{
    return ip;
}

#endif