/*
 *   This file is part of fastboot 3DS
 *   Copyright (C) 2017 derrek, profi200
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdio.h>
#include <string.h>
#include "types.h"
#include "mem_map.h"
#include "arm11/console.h"
#include "arm11/fmt.h"
#include "fs.h"
#include "hardware/pxi.h"
#include "hardware/gfx.h"
#include "arm11/hardware/interrupt.h"

static u32 debugHash = 0;


void debugHashCodeRoData()
{
#ifndef NDEBUG
	extern u32 __start__[];
	extern u32 __exidx_start[];

	u32 *start = __start__;
	u32 *end = __exidx_start;

	debugHash = 0;

	for(u32 *ptr = start; ptr < end; ptr++)
		debugHash += *ptr;
#endif
}

noreturn void panic()
{
	register u32 lr __asm__("lr");

	consoleInit(SCREEN_SUB, NULL, false);

	ee_printf("\x1b[41m\x1b[0J\x1b[15C****PANIC!!!****\n\nlr = 0x%08" PRIX32 "\n", lr);

	//fsUnmountAll();
	//devs_close();

	GX_textureCopy((u64*)RENDERBUF_TOP, 0, (u64*)GFX_getFramebuffer(SCREEN_TOP),
	               0, SCREEN_SIZE_TOP + SCREEN_SIZE_SUB);
	GFX_swapFramebufs();

	while(1) __wfi();
}

noreturn void panicMsg(const char *msg)
{
	register u32 lr __asm__("lr");

	consoleInit(SCREEN_SUB, NULL, false);

	ee_printf("\x1b[41m\x1b[0J\x1b[15C****PANIC!!!****\n\nlr = 0x%08" PRIX32 "\n", lr);
	ee_printf("\nERROR MESSAGE:\n%s\n", msg);

	//fsUnmountAll();
	//devs_close();

	GX_textureCopy((u64*)RENDERBUF_TOP, 0, (u64*)GFX_getFramebuffer(SCREEN_TOP),
				   0, SCREEN_SIZE_TOP + SCREEN_SIZE_SUB);
	GFX_swapFramebufs();

	while(1) __wfi();
}

// Expects the registers in the exception stack to be in the following order:
// r0-r14, pc (unmodified), cpsr
noreturn void guruMeditation(u8 type, const u32 *excStack)
{
	const char *const typeStr[3] = {"Undefined instruction", "Prefetch abort", "Data abort"};
	u32 realPc, instSize = 4;
	//bool codeChanged = false;


	// verify text and rodata
	/*u32 prevHash = debugHash;
	debugHashCodeRoData();
	if(prevHash != debugHash)
		codeChanged = true;*/

	consoleInit(SCREEN_SUB, NULL, false);

	if(excStack[16] & 0x20) instSize = 2;                 // Processor was in Thumb mode?
	if(type == 2) realPc = excStack[15] - (instSize * 2); // Data abort
	else realPc = excStack[15] - instSize;                // Other

	ee_printf("\x1b[41m\x1b[0J\x1b[15CGuru Meditation Error!\n\n%s:\n", typeStr[type]);
	ee_printf("CPSR: 0x%08" PRIX32 "\n"
	       "r0 = 0x%08" PRIX32 " r6  = 0x%08" PRIX32 " r12 = 0x%08" PRIX32 "\n"
	       "r1 = 0x%08" PRIX32 " r7  = 0x%08" PRIX32 " sp  = 0x%08" PRIX32 "\n"
	       "r2 = 0x%08" PRIX32 " r8  = 0x%08" PRIX32 " lr  = 0x%08" PRIX32 "\n"
	       "r3 = 0x%08" PRIX32 " r9  = 0x%08" PRIX32 " pc  = 0x%08" PRIX32 "\n"
	       "r4 = 0x%08" PRIX32 " r10 = 0x%08" PRIX32 "\n"
	       "r5 = 0x%08" PRIX32 " r11 = 0x%08" PRIX32 "\n\n",
	       excStack[16],
	       excStack[0], excStack[6],  excStack[12],
	       excStack[1], excStack[7],  excStack[13],
	       excStack[2], excStack[8],  excStack[14],
	       excStack[3], excStack[9],  realPc,
	       excStack[4], excStack[10],
	       excStack[5], excStack[11]);

	ee_puts("Stack dump:");
	u32 sp = excStack[13];
	if(sp >= AXIWRAM_BASE && sp < AXIWRAM_BASE + AXIWRAM_SIZE && !(sp & 3u))
	{
		u32 stackWords = ((AXIWRAM_BASE + AXIWRAM_SIZE - sp) / 4 > 48 ? 48 : (AXIWRAM_BASE + AXIWRAM_SIZE - sp) / 4);

		u32 newlineCounter = 0;
		for(u32 i = 0; i < stackWords; i++)
		{
			if(newlineCounter == 4) {ee_printf("\n"); newlineCounter = 0;}
			ee_printf("0x%08" PRIX32 " ", ((u32*)sp)[i]);
			newlineCounter++;
		}
	}

	//if(codeChanged) ee_printf("Attention: RO section data changed!!");

	// avoid fs corruptions
	//fsUnmountAll();
	//devs_close();

	GX_textureCopy((u64*)RENDERBUF_TOP, 0, (u64*)GFX_getFramebuffer(SCREEN_TOP),
				   0, SCREEN_SIZE_TOP + SCREEN_SIZE_SUB);
	GFX_swapFramebufs();

	while(1) __wfi();
}

/*void dumpMem(u8 *mem, u32 size, char *filepath)
{
	FIL file;
	UINT bytesWritten;

	if(f_open(&file, filepath, FA_CREATE_ALWAYS | FA_WRITE) != FR_OK)
		return;
		
	f_write(&file, mem, size, &bytesWritten);
	
	f_sync(&file);

	f_close(&file);
}*/