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
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/*
* Copyright (c) 1995, 1994, 1993, 1992, 1991, 1990
* Open Software Foundation, Inc.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both the copyright notice and this permission notice appear in
* supporting documentation, and that the name of ("OSF") or Open Software
* Foundation not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior permission.
*
* OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL OSF BE LIABLE FOR ANY
* SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* ACTION OF CONTRACT, NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE
*/
/*
* OSF Research Institute MK6.1 (unencumbered) 1/31/1995
*/
#include <alloca.h>
#include <mach/machine/vm_types.h>
#include <elf.h>
#include "mach-exec.h"
int exec_load(exec_read_func_t *read, exec_read_exec_func_t *read_exec,
void *handle, exec_info_t *out_info)
{
vm_size_t actual;
union { Elf32_Ehdr h; Elf64_Ehdr h64; } x;
int i;
int result;
/* Read the ELF header. */
if ((result = (*read)(handle, 0, &x, sizeof(x), &actual)) != 0)
return result;
if (actual < sizeof(x))
return EX_NOT_EXECUTABLE;
if ((x.h.e_ident[EI_MAG0] != ELFMAG0) ||
(x.h.e_ident[EI_MAG1] != ELFMAG1) ||
(x.h.e_ident[EI_MAG2] != ELFMAG2) ||
(x.h.e_ident[EI_MAG3] != ELFMAG3))
return EX_NOT_EXECUTABLE;
/* Make sure the file is of the right architecture. */
#ifdef i386
# define MY_CLASS ELFCLASS32
# define MY_DATA ELFDATA2LSB
# define MY_MACHINE EM_386
#elif defined __alpha__
# define MY_CLASS ELFCLASS64
# define MY_DATA ELFDATA2LSB
# define MY_MACHINE EM_ALPHA
#else
#error Not ported to this architecture!
#endif
if ((x.h.e_ident[EI_CLASS] != MY_CLASS) ||
(x.h.e_ident[EI_DATA] != MY_DATA))
return EX_WRONG_ARCH;
if (MY_CLASS == ELFCLASS64)
{
Elf64_Phdr *phdr, *ph;
vm_size_t phsize;
if (x.h64.e_machine != MY_MACHINE)
return EX_WRONG_ARCH;
/* XXX others */
out_info->entry = (vm_offset_t) x.h64.e_entry;
out_info->init_dp = 0; /* ? */
phsize = x.h64.e_phnum * x.h64.e_phentsize;
phdr = (Elf64_Phdr *)alloca(phsize);
result = (*read)(handle, x.h64.e_phoff, phdr, phsize, &actual);
if (result)
return result;
if (actual < phsize)
return EX_CORRUPT;
for (i = 0; i < x.h64.e_phnum; i++)
{
ph = (Elf64_Phdr *)((vm_offset_t)phdr + i * x.h64.e_phentsize);
if (ph->p_type == PT_LOAD)
{
exec_sectype_t type = EXEC_SECTYPE_ALLOC |
EXEC_SECTYPE_LOAD;
if (ph->p_flags & PF_R) type |= EXEC_SECTYPE_READ;
if (ph->p_flags & PF_W) type |= EXEC_SECTYPE_WRITE;
if (ph->p_flags & PF_X) type |= EXEC_SECTYPE_EXECUTE;
result = (*read_exec)(handle,
ph->p_offset, ph->p_filesz,
ph->p_vaddr, ph->p_memsz, type);
}
}
}
else
{
Elf32_Phdr *phdr, *ph;
vm_size_t phsize;
if (x.h.e_machine != MY_MACHINE)
return EX_WRONG_ARCH;
/* XXX others */
out_info->entry = (vm_offset_t) x.h.e_entry;
out_info->init_dp = 0; /* ? */
phsize = x.h.e_phnum * x.h.e_phentsize;
phdr = (Elf32_Phdr *)alloca(phsize);
result = (*read)(handle, x.h.e_phoff, phdr, phsize, &actual);
if (result)
return result;
if (actual < phsize)
return EX_CORRUPT;
for (i = 0; i < x.h.e_phnum; i++)
{
ph = (Elf32_Phdr *)((vm_offset_t)phdr + i * x.h.e_phentsize);
if (ph->p_type == PT_LOAD)
{
exec_sectype_t type = EXEC_SECTYPE_ALLOC |
EXEC_SECTYPE_LOAD;
if (ph->p_flags & PF_R) type |= EXEC_SECTYPE_READ;
if (ph->p_flags & PF_W) type |= EXEC_SECTYPE_WRITE;
if (ph->p_flags & PF_X) type |= EXEC_SECTYPE_EXECUTE;
result = (*read_exec)(handle,
ph->p_offset, ph->p_filesz,
ph->p_vaddr, ph->p_memsz, type);
}
}
}
return 0;
}
|
