1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
#include <kernel/system.h>
#include <kernel/fs/elf.h>
#include <kernel/lib/stdio.h>
#include <kernel/memory/alloc.h>
#include <kernel/lib/lib.h>
#include <kernel/memory/paging.h>
#include "load.h"
int elf_probe(uint8_t *buf)
{
elf_header_t *header = (elf_header_t *)buf;
if (header->ident[0] == 0x7f && header->ident[1] == 'E' && header->ident[2] == 'L' &&
header->ident[3] == 'F') {
serial_printf("Buffer is valid ELF file!");
return 1;
}
return 0;
}
uint8_t elf_start(uint8_t *buf)
{
elf_header_t *header = (elf_header_t *)buf;
serial_printf("Type: %s%s%s", header->ident[4] == 1 ? "32bit " : "64 bit",
header->ident[5] == 1 ? "Little Endian " : "Big endian ",
header->ident[6] == 1 ? "True ELF " : "buggy ELF ");
if (header->type != 2) {
serial_printf("File is not executable!");
return 0;
}
uint32_t phys_loc = loader_get_unused_load_location();
elf_program_header_t *ph = (elf_program_header_t *)(buf + header->phoff);
for (int i = 0; i < header->phnum; i++, ph++) {
switch (ph->type) {
case 0:
break;
case 1:
serial_printf(
"LOAD: offset 0x%x vaddr 0x%x paddr 0x%x filesz 0x%x memsz 0x%x",
ph->offset, ph->vaddr, ph->paddr, ph->filesz, ph->memsz);
paging_map(phys_loc, ph->vaddr, PT_PRESENT | PT_RW | PT_USED);
halt_loop();
memcpy((void *)ph->vaddr, buf + ph->offset, ph->filesz);
break;
default:
serial_printf("Unsupported type! Bail out!");
return 0;
}
}
return 0;
}
void elf_init()
{
loader_t *elfloader = (loader_t *)kmalloc(sizeof(loader_t));
elfloader->name = "ELF32";
elfloader->probe = (void *)elf_probe;
elfloader->start = (void *)elf_start;
register_loader(elfloader);
}
|
