usbloadergx/source/homebrewboot/BootHomebrew.c

#include <gccore.h>
#include <ogcsys.h>
#include <malloc.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <ogc/machine/processor.h>
#include <wiiuse/wpad.h>

#include "fatmounter.h"
#include "dolloader.h"
#include "elfloader.h"

void *innetbuffer = NULL;

int AllocHomebrewMemory(u32 filesize) {

    innetbuffer = malloc(filesize);

    if (!innetbuffer)
        return -1;

    return 1;

}

void FreeHomebrewBuffer() {
    free(innetbuffer);
    innetbuffer = NULL;
}

void CopyHomebrewMemory(u32 read, u8 *temp, u32 len) {

    memcpy(((u8 *) innetbuffer)+read, temp, len);

}

int BootHomebrew(char * path) {
    void *buffer = NULL;
    u32 filesize = 0;
    entrypoint entry;
    u32 cpu_isr;

    FILE * file = fopen(path, "rb");
    if (!file) SYS_ResetSystem(SYS_RETURNTOMENU, 0, 0);

    fseek (file, 0, SEEK_END);
    filesize = ftell(file);
    rewind(file);

    buffer = malloc(filesize);

    if (fread (buffer, 1, filesize, file) != filesize) {
        fclose (file);
        free(buffer);
        SDCard_deInit();
        USBDevice_deInit();
        SYS_ResetSystem(SYS_RETURNTOMENU, 0, 0);
    }
    fclose (file);

    struct __argv args;
    bzero(&args, sizeof(args));
    args.argvMagic = ARGV_MAGIC;
    args.length = strlen(path) + 2;
    args.commandLine = (char*)malloc(args.length);
    if (!args.commandLine) SYS_ResetSystem(SYS_RETURNTOMENU, 0, 0);
    strcpy(args.commandLine, path);
    args.commandLine[args.length - 1] = '\0';
    args.argc = 1;
    args.argv = &args.commandLine;
    args.endARGV = args.argv + 1;

    int ret = valid_elf_image(buffer);
    if (ret == 1)
        entry = (entrypoint) load_elf_image(buffer);
    else
        entry = (entrypoint) load_dol(buffer, &args);

    free(buffer);

    if (!entry) {
        SDCard_deInit();
        USBDevice_deInit();
        SYS_ResetSystem(SYS_RETURNTOMENU, 0, 0);
    }

    SDCard_deInit();
    USBDevice_deInit();

    WPAD_Flush(0);
    WPAD_Disconnect(0);
    WPAD_Shutdown();

    SYS_ResetSystem(SYS_SHUTDOWN, 0, 0);
    _CPU_ISR_Disable (cpu_isr);
    __exception_closeall();
    entry();
    _CPU_ISR_Restore (cpu_isr);

    return 0;
}

int BootHomebrewFromMem() {
    entrypoint entry;
    u32 cpu_isr;

    if (!innetbuffer) {
        SDCard_deInit();
        USBDevice_deInit();
        SYS_ResetSystem(SYS_RETURNTOMENU, 0, 0);
    }

    struct __argv args;

    int ret = valid_elf_image(innetbuffer);
    if (ret == 1)
        entry = (entrypoint) load_elf_image(innetbuffer);
    else
        entry = (entrypoint) load_dol(innetbuffer, &args);

    free(innetbuffer);

    if (!entry) {
        SDCard_deInit();
        USBDevice_deInit();
        SYS_ResetSystem(SYS_RETURNTOMENU, 0, 0);
    }

    SDCard_deInit();
    USBDevice_deInit();

    WPAD_Flush(0);
    WPAD_Disconnect(0);
    WPAD_Shutdown();

    SYS_ResetSystem(SYS_SHUTDOWN, 0, 0);
    _CPU_ISR_Disable (cpu_isr);
    __exception_closeall();
    entry();
    _CPU_ISR_Restore (cpu_isr);

    return 0;
}