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Option to load from relative sector

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This commit is contained in:
CTurt 2020-06-26 17:17:26 +01:00
parent 8fd3cecd87
commit 58ec3b0636
1 changed files with 21 additions and 11 deletions
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32
PAYLOAD/payload.c
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@ -1,5 +1,9 @@
#include <stddef.h>
// Pick one
#define LOAD_FROM_VTS_02_0_IFO
//#define LOAD_FROM_SECTOR_RELATIVE_TO_VIDEO_TS_IFO (151 - 138 - 7)
#define min(a, b) (((a) < (b)) ? (a) : (b))
#define pointToIFO ((void (*)(unsigned int index, unsigned int lba, unsigned int offset))0x25c880)
@ -82,8 +86,8 @@ static void readData(void *dest, unsigned int offset, size_t n) {
if(offset % 0x800) {
getBufferInternal("", 1, offset / 0x800, buffer, 1, 0);
memcpy_(dest, buffer + offset % 0x800, min(0x800 - offset, n));
copied += min(0x800 - offset, n);
memcpy_(dest, buffer + offset % 0x800, min(0x800 - (offset % 0x800), n));
copied += min(0x800 - (offset % 0x800), n);
}
if(remaining >= 0x800) {
@ -103,25 +107,31 @@ __attribute__((noreturn)) void _start(void) {
int i;
// point to VTS_02_0.IFO
pointToIFO(2, 0, 0);
// Force a read from VTS_02_0.IFO
char head[64];
getDiscData(64, &head);
#ifdef LOAD_FROM_VTS_02_0_IFO
// point to VTS_02_0.IFO
pointToIFO(2, 0, 0);
// Force a read from VTS_02_0.IFO
char head[64];
getDiscData(64, &head);
#define RELATIVE_SECTOR 0
#else
#define RELATIVE_SECTOR LOAD_FROM_SECTOR_RELATIVE_TO_VIDEO_TS_IFO
#endif
// Based on https://github.com/AKuHAK/uLaunchELF/blob/master/loader/loader.c
elf_header_t eh;
readData(&eh, 0, sizeof(elf_header_t));
readData(&eh, RELATIVE_SECTOR * 0x800, sizeof(elf_header_t));
elf_pheader_t eph[eh.phnum];
readData(&eph, eh.phoff, sizeof(elf_pheader_t) * eh.phnum);
readData(&eph, RELATIVE_SECTOR * 0x800 + eh.phoff, sizeof(elf_pheader_t) * eh.phnum);
for (i = 0; i < eh.phnum; i++) {
if (eph[i].type != ELF_PT_LOAD)
continue;
readData(eph[i].vaddr, eph[i].offset, eph[i].filesz);
readData(eph[i].vaddr, RELATIVE_SECTOR * 0x800 + eph[i].offset, eph[i].filesz);
if(eph[i].memsz > eph[i].filesz) memset(eph[i].vaddr + eph[i].filesz, 0, eph[i].memsz - eph[i].filesz);
}