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boot: Support AOUT_KLUDGE kernels

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This commit is contained in:
K. Lange 2021-10-20 11:59:14 +09:00
parent 76191f89fb
commit 900db689a5
1 changed files with 32 additions and 3 deletions
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35
boot/multiboot.c
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@ -47,10 +47,21 @@ static uintptr_t ramdisk_len = 0;
uintptr_t final_offset = 0;
uintptr_t _xmain = 0;
static int load_kernel(void) {
clear();
Elf32_Header * header = (Elf32_Header *)kernel_load_start;
static int load_aout(uint32_t * hdr) {
uintptr_t base_offset = (uintptr_t)hdr - (uintptr_t)kernel_load_start;
uintptr_t hdr_offset = hdr[3] - base_offset;
memcpy((void*)(uintptr_t)hdr[4], kernel_load_start + (hdr[4] - hdr_offset), (hdr[5] - hdr[4]));
memset((void*)(uintptr_t)hdr[5], 0, (hdr[6] - hdr[5]));
_xmain = (uintptr_t)hdr[7];
if (hdr[6] > final_offset) final_offset = hdr[6];
final_offset = (final_offset & ~(0xFFF)) + ((final_offset & 0xFFF) ? 0x1000 : 0);
return 1;
}
static int load_elf32(Elf32_Header * header) {
if (header->e_ident[0] != ELFMAG0 ||
header->e_ident[1] != ELFMAG1 ||
header->e_ident[2] != ELFMAG2 ||
@ -82,6 +93,24 @@ static int load_kernel(void) {
return 1;
}
static int load_kernel(void) {
clear();
/* Check for Multiboot header */
for (uintptr_t x = 0; x < 8192; x += 4) {
uint32_t * check = (uint32_t *)(kernel_load_start + x);
if (*check == 0x1BADB002) {
if (check[1] & (1 << 16)) {
return load_aout(check);
} else {
return load_elf32((void*)kernel_load_start);
}
}
}
return 0;
}
static void relocate_ramdisk(mboot_mod_t * mboot_mods) {
char * dest = (char*)final_offset;
char * src = (char*)ramdisk_off;