// Adapted from: https://github.com/kstenerud/KSCrash
//
//  SentryCrashCPU_x86_32.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(__i386__)

#    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[] = {
    "eax",
    "ebx",
    "ecx",
    "edx",
    "edi",
    "esi",
    "ebp",
    "esp",
    "ss",
    "eflags",
    "eip",
    "cs",
    "ds",
    "es",
    "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.__ebp;
}

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

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

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_STATE32,
        x86_THREAD_STATE32_COUNT);
    sentrycrashcpu_i_fillState(thread, (thread_state_t)&machineContext->__es, x86_EXCEPTION_STATE32,
        x86_EXCEPTION_STATE32_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.__eax;
    case 1:
        return context->machineContext.__ss.__ebx;
    case 2:
        return context->machineContext.__ss.__ecx;
    case 3:
        return context->machineContext.__ss.__edx;
    case 4:
        return context->machineContext.__ss.__edi;
    case 5:
        return context->machineContext.__ss.__esi;
    case 6:
        return context->machineContext.__ss.__ebp;
    case 7:
        return context->machineContext.__ss.__esp;
    case 8:
        return context->machineContext.__ss.__ss;
    case 9:
        return context->machineContext.__ss.__eflags;
    case 10:
        return context->machineContext.__ss.__eip;
    case 11:
        return context->machineContext.__ss.__cs;
    case 12:
        return context->machineContext.__ss.__ds;
    case 13:
        return context->machineContext.__ss.__es;
    case 14:
        return context->machineContext.__ss.__fs;
    case 15:
        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