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
|
#include <elf.h>
#include <stdio.h>
#include <string.h>
#include <load.h>
#include <log.h>
vaddr load(const char *path)
{
FILE *file = fopen(path, "rb");
if (!file) {
errln("can't read file %s.", path);
return 0;
}
Elf64_Ehdr header = { 0 };
fread(&header, sizeof(header), 1, file);
if (memcmp(header.e_ident, ELFMAG, SELFMAG)) {
errln("invalid ELF %s.", path);
return 0;
}
for (int i = 0; i < header.e_phnum; i++) {
int offset = header.e_phoff + header.e_phentsize * i;
if (fseek(file, offset, SEEK_SET)) {
errln("can't seek program to %x", offset);
return 0;
}
Elf64_Phdr program = { 0 };
if (fread(&program, sizeof(program), 1, file) != 1) {
errln("invalid program size %d", i);
return 0;
}
if (!program.p_vaddr || program.p_type != PT_LOAD)
continue;
void *addr = mem_alloc(program.p_memsz, program.p_vaddr);
if (!addr) {
errln("can't allocate %dB at %x", program.p_memsz,
program.p_vaddr);
return 0;
}
if (fseek(file, program.p_offset, SEEK_SET)) {
errln("can't seek program to %x", offset);
return 0;
}
if (fread(addr, program.p_filesz, 1, file) != 1) {
errln("invalid program size %d", i);
return 0;
}
logln("loaded program %d", i);
}
fclose(file);
return header.e_entry;
}
|
