mini/main.c

/*
	mini - a Free Software replacement for the Nintendo/BroadOn IOS.

Copyright (C) 2008, 2009	Haxx Enterprises
Copyright (C) 2008, 2009 	Sven Peter <svenpeter@gmail.com>
TODO add yourself here, kthx

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, version 2.

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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/
#include "types.h"
#include "utils.h"
#include "start.h"
#include "hollywood.h"
#include "sdhc.h"
#include "string.h"
#include "memory.h"
#include "elf.h"
#include "gecko.h"
#include "ff.h"
#include "panic.h"
#include "powerpc_elf.h"
#include "irq.h"
#include "ipc.h"
#include "exception.h"
#include "crypto.h"
#include "nand.h"
#include "boot2.h"

void *vector;

typedef struct {
	u32 hdrsize;
	u32 loadersize;
	u32 elfsize;
	u32 argument;
} ioshdr;

u32 match[] = {
	0xF7FFFFB8,
	0xBC024708,
	1,
	2,
};

static inline void mem1_poke(u8 *dst, u8 bv)
{
	u32 *p = (u32*)(((u32)dst) & ~3);
	u32 val = *p;

	switch(((u32)dst) & 3) {
		case 0:
			val = (val & 0x00FFFFFF) | bv << 24;
			break;
		case 1:
			val = (val & 0xFF00FFFF) | bv << 16;
			break;
		case 2:
			val = (val & 0xFFFF00FF) | bv << 8;
			break;
		case 3:
			val = (val & 0xFFFFFF00) | bv;
			break;
	}

	*p = val;
}

void *memcpy_mem1(void *dst, const void *src, size_t n)
{
	unsigned char *p;
	const unsigned char *q;

	for (p = dst, q = src; n; n--) {
		mem1_poke(p++, *q++);
	}

	return dst;
}

static void patch_mem(u8 *offset, u32 size, u64 titleID)
{
	while(size>sizeof(match)) {
		if(!memcmp(offset, match, sizeof(match))) {
			gecko_printf("--> Patching @ %p\n", offset+8);
			gecko_printf("--> To TitleID %08x%08x\n", (u32)(titleID>>32), (u32)titleID);
			memcpy_mem1(offset+8, &titleID, sizeof(u64));
			return;
		}
		offset++;
		size -= 1;
	}
}

void boot2_patchelf(u8 *elf, u64 titleID) {
	gecko_printf("Patching boot2 ELF...\n");

	if(memcmp("\x7F" "ELF\x01\x02\x01\x61\x01",elf,9)) {
		gecko_printf("Invalid ELF header! 0x%02x 0x%02x 0x%02x 0x%02x\n",elf[0], elf[1], elf[2], elf[3]);
		return;
	}

	Elf32_Ehdr *ehdr = (Elf32_Ehdr*)elf;
	if(ehdr->e_phoff == 0) {
		gecko_printf("ELF has no program headers!\n");
		return;
	}
	int count = ehdr->e_phnum;
	Elf32_Phdr *phdr = (Elf32_Phdr*)(elf + ehdr->e_phoff);
	gecko_printf("PHDRS at %p\n",phdr);
	while(count--)
	{
		if(phdr->p_type != PT_LOAD) {
			gecko_printf("Skipping PHDR of type %d\n",phdr->p_type);
		} else {
			void *src = elf + phdr->p_offset;
			gecko_printf("PATCH %p -> %p/%p [0x%x]\n",src, phdr->p_paddr, phdr->p_vaddr, phdr->p_filesz);
			if(phdr->p_vaddr == (void*)0x20100000) {
				gecko_printf("-> Found ES code PHDR\n");
				patch_mem(src, phdr->p_filesz, titleID);
			}
		}
		phdr++;
	}
	gecko_printf("Done!\n");
}

#define PPC_BOOT_FILE "/system/ppcboot.elf"

FATFS fatfs;

void *patch_boot2(void *base, u64 titleID)
{

	ioshdr *hdr = (ioshdr*)base;
	ioshdr *parhdr = (ioshdr*)hdr->argument;
	u8 *elf;

	gecko_printf("Patching BOOT2 for leet hax\n");
	gecko_printf("Parent BOOT2 header (@%p):\n",parhdr);
	gecko_printf(" Header size: %08x\n", parhdr->hdrsize);
	gecko_printf(" Loader size: %08x\n", parhdr->loadersize);
	gecko_printf(" ELF size: %08x\n", parhdr->elfsize);
	gecko_printf(" Argument: %08x\n", parhdr->argument);

	elf = (u8*) parhdr;
	elf += parhdr->hdrsize + parhdr->loadersize;
	gecko_printf("ELF at %p\n",elf);

	boot2_patchelf(elf, titleID);

	parhdr->argument = 0x42;

	gecko_printf("Vector: %p\n", (void*)(((u32)parhdr) + parhdr->hdrsize));

	return (void*)(((u32)parhdr) + parhdr->hdrsize);
}

void *_main(void *base)
{
	FRESULT fres;
	int res;

	gecko_init();
	gecko_printf("mini v0.2 loading\n");

	gecko_printf("Initializing exceptions...\n");
	exception_initialize();
	gecko_printf("Configuring caches and MMU...\n");
	mem_initialize();

	gecko_printf("IOSflags: %08x %08x %08x\n",
		read32(0xffffff00), read32(0xffffff04), read32(0xffffff08));
	gecko_printf("          %08x %08x %08x\n",
		read32(0xffffff0c), read32(0xffffff10), read32(0xffffff14));

	irq_initialize();
	irq_enable(IRQ_TIMER);
	irq_enable(IRQ_GPIO1B);
	irq_enable(IRQ_GPIO1);
	irq_enable(IRQ_RESET);
	gecko_printf("Interrupts initialized\n");

	crypto_initialize();
	gecko_printf("crypto support initialized\n");

	nand_initialize();
	gecko_printf("NAND initialized.\n");

	boot2_init();

	gecko_printf("Initializing IPC...\n");
	ipc_initialize();

	gecko_printf("Initializing SD...\n");
	sd_initialize();

	gecko_printf("Mounting SD...\n");
	fres = f_mount(0, &fatfs);

	if (read32(0x0d800190) & 2) {
		gecko_printf("GameCube compatibility mode detected...\n");
		boot2_run(1, 0x101);
		goto shutdown;
	}

	if(fres != FR_OK) {
		gecko_printf("Error %d while trying to mount SD\n", fres);
		panic2(0, PANIC_MOUNT);
	}

	gecko_printf("Trying to boot:" PPC_BOOT_FILE "\n");

	res = powerpc_load_file(PPC_BOOT_FILE);
	if(res < 0) {
		gecko_printf("Failed to boot PPC: %d\n", res);
		gecko_printf("Continuing anyway\n");
	}

	gecko_printf("Going into IPC mainloop...\n");
	ipc_process_slow();
	gecko_printf("IPC mainloop done!\n");
	gecko_printf("Shutting down IPC...\n");
	ipc_shutdown();

shutdown:
	gecko_printf("Shutting down interrupts...\n");
	irq_shutdown();
	gecko_printf("Shutting down caches and MMU...\n");
	mem_shutdown();

	gecko_printf("Vectoring to %p...\n",vector);
	return vector;
}