2 * GRUB -- GRand Unified Bootloader
3 * Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009 Free Software Foundation, Inc.
5 * GRUB is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * GRUB is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
19 #if defined(MULTIBOOT_LOAD_ELF32)
21 # define E_MACHINE MULTIBOOT_ELF32_MACHINE
22 # define ELFCLASSXX ELFCLASS32
23 # define Elf_Ehdr Elf32_Ehdr
24 # define Elf_Phdr Elf32_Phdr
25 # define Elf_Shdr Elf32_Shdr
26 #elif defined(MULTIBOOT_LOAD_ELF64)
28 # define E_MACHINE MULTIBOOT_ELF64_MACHINE
29 # define ELFCLASSXX ELFCLASS64
30 # define Elf_Ehdr Elf64_Ehdr
31 # define Elf_Phdr Elf64_Phdr
32 # define Elf_Shdr Elf64_Shdr
37 #include <grub/i386/relocator.h>
39 #define CONCAT(a,b) CONCAT_(a, b)
40 #define CONCAT_(a,b) a ## b
42 #pragma GCC diagnostic ignored "-Wcast-align"
44 /* Check if BUFFER contains ELF32 (or ELF64). */
46 CONCAT(grub_multiboot_is_elf
, XX
) (void *buffer
)
48 Elf_Ehdr
*ehdr
= (Elf_Ehdr
*) buffer
;
50 return ehdr
->e_ident
[EI_CLASS
] == ELFCLASSXX
;
54 CONCAT(grub_multiboot_load_elf
, XX
) (grub_file_t file
, const char *filename
, void *buffer
)
56 Elf_Ehdr
*ehdr
= (Elf_Ehdr
*) buffer
;
60 if (ehdr
->e_ident
[EI_MAG0
] != ELFMAG0
61 || ehdr
->e_ident
[EI_MAG1
] != ELFMAG1
62 || ehdr
->e_ident
[EI_MAG2
] != ELFMAG2
63 || ehdr
->e_ident
[EI_MAG3
] != ELFMAG3
64 || ehdr
->e_ident
[EI_DATA
] != ELFDATA2LSB
)
65 return grub_error(GRUB_ERR_UNKNOWN_OS
, N_("invalid arch-independent ELF magic"));
67 if (ehdr
->e_ident
[EI_CLASS
] != ELFCLASSXX
|| ehdr
->e_machine
!= E_MACHINE
68 || ehdr
->e_version
!= EV_CURRENT
)
69 return grub_error (GRUB_ERR_UNKNOWN_OS
, N_("invalid arch-dependent ELF magic"));
71 if (ehdr
->e_type
!= ET_EXEC
&& ehdr
->e_type
!= ET_DYN
)
72 return grub_error (GRUB_ERR_UNKNOWN_OS
, N_("this ELF file is not of the right type"));
74 /* FIXME: Should we support program headers at strange locations? */
75 if (ehdr
->e_phoff
+ ehdr
->e_phnum
* ehdr
->e_phentsize
> MULTIBOOT_SEARCH
)
76 return grub_error (GRUB_ERR_BAD_OS
, "program header at a too high offset");
78 #ifdef MULTIBOOT_LOAD_ELF64
80 /* We still in 32-bit mode. */
81 if (ehdr
->e_entry
< 0xffffffff80000000ULL
)
82 return grub_error (GRUB_ERR_BAD_OS
, "invalid entry point for ELF64");
84 /* We still in 32-bit mode. */
85 if (ehdr
->e_entry
> 0xffffffff)
86 return grub_error (GRUB_ERR_BAD_OS
, "invalid entry point for ELF64");
90 phdr_base
= (char *) buffer
+ ehdr
->e_phoff
;
91 #define phdr(i) ((Elf_Phdr *) (phdr_base + (i) * ehdr->e_phentsize))
93 /* Load every loadable segment in memory. */
94 for (i
= 0; i
< ehdr
->e_phnum
; i
++)
96 if (phdr(i
)->p_type
== PT_LOAD
)
101 grub_dprintf ("multiboot_loader", "segment %d: paddr=0x%lx, memsz=0x%lx, vaddr=0x%lx\n",
102 i
, (long) phdr(i
)->p_paddr
, (long) phdr(i
)->p_memsz
, (long) phdr(i
)->p_vaddr
);
105 grub_relocator_chunk_t ch
;
106 err
= grub_relocator_alloc_chunk_addr (grub_multiboot_relocator
,
107 &ch
, phdr(i
)->p_paddr
,
111 grub_dprintf ("multiboot_loader", "Error loading phdr %d\n", i
);
114 source
= get_virtual_current_address (ch
);
117 if (phdr(i
)->p_filesz
!= 0)
119 if (grub_file_seek (file
, (grub_off_t
) phdr(i
)->p_offset
)
123 if (grub_file_read (file
, source
, phdr(i
)->p_filesz
)
124 != (grub_ssize_t
) phdr(i
)->p_filesz
)
127 grub_error (GRUB_ERR_FILE_READ_ERROR
, N_("premature end of file %s"),
133 if (phdr(i
)->p_filesz
< phdr(i
)->p_memsz
)
134 grub_memset ((grub_uint8_t
*) source
+ phdr(i
)->p_filesz
, 0,
135 phdr(i
)->p_memsz
- phdr(i
)->p_filesz
);
139 for (i
= 0; i
< ehdr
->e_phnum
; i
++)
140 if (phdr(i
)->p_vaddr
<= ehdr
->e_entry
141 && phdr(i
)->p_vaddr
+ phdr(i
)->p_memsz
> ehdr
->e_entry
)
143 grub_multiboot_payload_eip
= (ehdr
->e_entry
- phdr(i
)->p_vaddr
)
148 if (i
== ehdr
->e_phnum
)
149 return grub_error (GRUB_ERR_BAD_OS
, "entry point isn't in a segment");
151 #if defined (__i386__) || defined (__x86_64__)
153 #elif defined (__mips)
154 grub_multiboot_payload_eip
|= 0x80000000;
156 #error Please complete this
161 grub_uint8_t
*shdr
, *shdrptr
;
163 shdr
= grub_malloc (ehdr
->e_shnum
* ehdr
->e_shentsize
);
167 if (grub_file_seek (file
, ehdr
->e_shoff
) == (grub_off_t
) -1)
170 if (grub_file_read (file
, shdr
, ehdr
->e_shnum
* ehdr
->e_shentsize
)
171 != (grub_ssize_t
) ehdr
->e_shnum
* ehdr
->e_shentsize
)
174 grub_error (GRUB_ERR_FILE_READ_ERROR
, N_("premature end of file %s"),
179 for (shdrptr
= shdr
, i
= 0; i
< ehdr
->e_shnum
;
180 shdrptr
+= ehdr
->e_shentsize
, i
++)
182 Elf_Shdr
*sh
= (Elf_Shdr
*) shdrptr
;
187 /* This section is a loaded section,
189 if (sh
->sh_addr
!= 0)
192 /* This section is empty, so we don't care. */
193 if (sh
->sh_size
== 0)
197 grub_relocator_chunk_t ch
;
198 err
= grub_relocator_alloc_chunk_align (grub_multiboot_relocator
,
200 (0xffffffff - sh
->sh_size
)
203 GRUB_RELOCATOR_PREFERENCE_NONE
,
207 grub_dprintf ("multiboot_loader", "Error loading shdr %d\n", i
);
210 src
= get_virtual_current_address (ch
);
211 target
= get_physical_target_address (ch
);
214 if (grub_file_seek (file
, sh
->sh_offset
) == (grub_off_t
) -1)
217 if (grub_file_read (file
, src
, sh
->sh_size
)
218 != (grub_ssize_t
) sh
->sh_size
)
221 grub_error (GRUB_ERR_FILE_READ_ERROR
, N_("premature end of file %s"),
225 sh
->sh_addr
= target
;
227 grub_multiboot_add_elfsyms (ehdr
->e_shnum
, ehdr
->e_shentsize
,
228 ehdr
->e_shstrndx
, shdr
);