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Commit | Line | Data |
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1 | #include <elf.h> | |
2 | #include <output.h> | |
3 | #include <minilib.h> | |
4 | ||
5 | static const unsigned char elf_ident[4] = { 0x7F, 'E', 'L', 'F' }; | |
6 | ||
7 | int load_elf (char * buf, int size) { | |
8 | ||
9 | Elf32_Ehdr * elf_hdr = (Elf32_Ehdr *) buf; | |
10 | Elf32_Shdr * elf_sec_hdrs = (Elf32_Shdr *) (buf + elf_hdr->e_shoff); | |
11 | ||
12 | /* Sanity check on ELF file */ | |
13 | if (memcmp((void *)elf_hdr->e_ident, (void *)elf_ident, sizeof(elf_ident))) return -1; | |
14 | if (elf_hdr->e_type != ET_EXEC) return -1; | |
15 | if (elf_hdr->e_machine != EM_386) return -1; | |
16 | if (elf_hdr->e_version != EV_CURRENT) return -1; | |
17 | if (size < sizeof(Elf32_Ehdr)) return -1; | |
18 | if (((char *)&elf_sec_hdrs[elf_hdr->e_shnum]) > (buf + size)) return -1; | |
19 | ||
20 | char * string_table = buf + elf_sec_hdrs[elf_hdr->e_shstrndx].sh_offset; | |
21 | ||
22 | if (string_table > (buf + size)) return -1; | |
23 | ||
24 | int i; | |
25 | for (i = 0; i < elf_hdr->e_shnum; i++) { | |
26 | ||
27 | if (elf_sec_hdrs[i].sh_name == SHN_UNDEF) { | |
28 | continue; | |
29 | } | |
30 | ||
31 | char * section_name = string_table + elf_sec_hdrs[i].sh_name; | |
32 | ||
33 | if ((elf_sec_hdrs[i].sh_type != SHT_PROGBITS) || !(elf_sec_hdrs[i].sh_flags & SHF_ALLOC)) { | |
34 | outputf("Skipping %s", section_name); | |
35 | continue; | |
36 | } | |
37 | ||
38 | outputf("Loading %s at %08x", section_name, elf_sec_hdrs[i].sh_addr); | |
39 | ||
40 | memcpy((void *)elf_sec_hdrs[i].sh_addr, | |
41 | buf + elf_sec_hdrs[i].sh_offset, | |
42 | elf_sec_hdrs[i].sh_size); | |
43 | } | |
44 | ||
45 | return 0; | |
46 | } |