patch_disable_prefix_check.c

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/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# Copyright (c) 2003  Marcus R. Brown <mrbrown@0xd6.org>
# Licenced under Academic Free License version 2.0
# Review ps2sdk README & LICENSE files for further details.
*/
 
#include <tamtypes.h>
#include <kernel.h>
#include <string.h>
 
#include "slib.h"
 
extern slib_exp_lib_list_t _slib_cur_exp_lib_list;
 
static const u32 g_patch[2] = {
    0x03e00008, /* jr $ra */
    0x00001021  /* addiu $v0, $0, 0 */
};
 
int sbv_patch_disable_prefix_check(void)
{
    union {
        u8 buf[256];
        slib_exp_lib_t exp_lib;
    } buf;
    static u32 patch[sizeof(g_patch)/sizeof(g_patch[0])] ALIGNED(16);
    SifDmaTransfer_t dmat;
    slib_exp_lib_t *modload_lib = &buf.exp_lib;
 
    memcpy(UNCACHED_SEG(patch), g_patch, sizeof(g_patch));
    memset(&_slib_cur_exp_lib_list, 0, sizeof(slib_exp_lib_list_t));
 
    if (!slib_get_exp_lib("modload", modload_lib))
        return -1;
 
    dmat.src=patch;
    dmat.size=sizeof(patch);    //16-bytes will be written to IOP RAM, but the function on the IOP side is longer than 16 bytes in length.
    dmat.dest=modload_lib->exports[15];
    dmat.attr=0;
 
    sceSifSetDma(&dmat, 1);
 
    return 0;
}