Atmosphere/fusee/fusee-primary/src/chainloader.c

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/*
* Copyright (c) 2018 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 "chainloader.h"
int g_chainloader_argc = 0;
char g_chainloader_arg_data[CHAINLOADER_ARG_DATA_MAX_SIZE] = {0};
chainloader_entry_t g_chainloader_entries[CHAINLOADER_MAX_ENTRIES] = {0}; /* keep them sorted */
size_t g_chainloader_num_entries = 0;
uintptr_t g_chainloader_entrypoint = 0;
#pragma GCC optimize (3)
static void *xmemmove(void *dst, const void *src, size_t len)
{
const uint8_t *src8 = (const uint8_t *)src;
uint8_t *dst8 = (uint8_t *)dst;
if (dst8 < src8) {
for (size_t i = 0; i < len; i++) {
dst8[i] = src8[i];
}
} else if (dst8 > src8) {
for (size_t i = len; len > 0; len--)
dst8[i - 1] = src8[i - 1];
}
return dst;
}
void relocate_and_chainload_main(void) {
for(size_t i = 0; i < g_chainloader_num_entries; i++) {
chainloader_entry_t *entry = &g_chainloader_entries[i];
xmemmove((void *)entry->load_address, (const void *)entry->src_address, entry->size);
}
((void (*)(int, void *))g_chainloader_entrypoint)(g_chainloader_argc, g_chainloader_arg_data);
}