powerpc: Make the 64-bit kernel as a position-independent executable
[linux-2.6.git] / arch / powerpc / boot / elf_util.c
1 /*
2  * Copyright (C) Paul Mackerras 1997.
3  *
4  * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11 #include <stdarg.h>
12 #include <stddef.h>
13 #include "elf.h"
14 #include "page.h"
15 #include "string.h"
16 #include "stdio.h"
17
18 int parse_elf64(void *hdr, struct elf_info *info)
19 {
20         Elf64_Ehdr *elf64 = hdr;
21         Elf64_Phdr *elf64ph;
22         unsigned int i;
23
24         if (!(elf64->e_ident[EI_MAG0]  == ELFMAG0       &&
25               elf64->e_ident[EI_MAG1]  == ELFMAG1       &&
26               elf64->e_ident[EI_MAG2]  == ELFMAG2       &&
27               elf64->e_ident[EI_MAG3]  == ELFMAG3       &&
28               elf64->e_ident[EI_CLASS] == ELFCLASS64    &&
29               elf64->e_ident[EI_DATA]  == ELFDATA2MSB   &&
30               (elf64->e_type            == ET_EXEC ||
31                elf64->e_type            == ET_DYN)      &&
32               elf64->e_machine         == EM_PPC64))
33                 return 0;
34
35         elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
36                                  (unsigned long)elf64->e_phoff);
37         for (i = 0; i < (unsigned int)elf64->e_phnum; i++, elf64ph++)
38                 if (elf64ph->p_type == PT_LOAD)
39                         break;
40         if (i >= (unsigned int)elf64->e_phnum)
41                 return 0;
42
43         info->loadsize = (unsigned long)elf64ph->p_filesz;
44         info->memsize = (unsigned long)elf64ph->p_memsz;
45         info->elfoffset = (unsigned long)elf64ph->p_offset;
46
47         return 1;
48 }
49
50 int parse_elf32(void *hdr, struct elf_info *info)
51 {
52         Elf32_Ehdr *elf32 = hdr;
53         Elf32_Phdr *elf32ph;
54         unsigned int i;
55
56         if (!(elf32->e_ident[EI_MAG0]  == ELFMAG0       &&
57               elf32->e_ident[EI_MAG1]  == ELFMAG1       &&
58               elf32->e_ident[EI_MAG2]  == ELFMAG2       &&
59               elf32->e_ident[EI_MAG3]  == ELFMAG3       &&
60               elf32->e_ident[EI_CLASS] == ELFCLASS32    &&
61               elf32->e_ident[EI_DATA]  == ELFDATA2MSB   &&
62               (elf32->e_type            == ET_EXEC ||
63                elf32->e_type            == ET_DYN)      &&
64               elf32->e_machine         == EM_PPC))
65                 return 0;
66
67         elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
68         for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
69                 if (elf32ph->p_type == PT_LOAD)
70                         break;
71         if (i >= elf32->e_phnum)
72                 return 0;
73
74         info->loadsize = elf32ph->p_filesz;
75         info->memsize = elf32ph->p_memsz;
76         info->elfoffset = elf32ph->p_offset;
77         return 1;
78 }