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
|
#ifdef SUPPORT_ANDROID_PRELINK_TAGS
#include <sys/types.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <prelink_info.h>
#include <debug.h>
#include <common.h>
typedef struct {
uint32_t mmap_addr;
char tag[4]; /* 'P', 'R', 'E', ' ' */
} prelink_info_t __attribute__((packed));
static inline void set_prelink(long *prelink_addr,
int elf_little,
prelink_info_t *info)
{
FAILIF(sizeof(prelink_info_t) != 8, "Unexpected sizeof(prelink_info_t) == %d!\n", sizeof(prelink_info_t));
if (prelink_addr) {
if (!(elf_little ^ is_host_little())) {
/* Same endianness */
*prelink_addr = info->mmap_addr;
}
else {
/* Different endianness */
*prelink_addr = switch_endianness(info->mmap_addr);
}
}
}
int check_prelinked(const char *fname, int elf_little, long *prelink_addr)
{
FAILIF(sizeof(prelink_info_t) != 8, "Unexpected sizeof(prelink_info_t) == %d!\n", sizeof(prelink_info_t));
int fd = open(fname, O_RDONLY);
FAILIF(fd < 0, "open(%s, O_RDONLY): %s (%d)!\n",
fname, strerror(errno), errno);
off_t end = lseek(fd, 0, SEEK_END);
int nr = sizeof(prelink_info_t);
off_t sz = lseek(fd, -nr, SEEK_CUR);
ASSERT((long)(end - sz) == (long)nr);
FAILIF(sz == (off_t)-1,
"lseek(%d, 0, SEEK_END): %s (%d)!\n",
fd, strerror(errno), errno);
prelink_info_t info;
int num_read = read(fd, &info, nr);
FAILIF(num_read < 0,
"read(%d, &info, sizeof(prelink_info_t)): %s (%d)!\n",
fd, strerror(errno), errno);
FAILIF(num_read != sizeof(info),
"read(%d, &info, sizeof(prelink_info_t)): did not read %d bytes as "
"expected (read %d)!\n",
fd, sizeof(info), num_read);
int prelinked = 0;
if (!strncmp(info.tag, "PRE ", 4)) {
set_prelink(prelink_addr, elf_little, &info);
prelinked = 1;
}
FAILIF(close(fd) < 0, "close(%d): %s (%d)!\n", fd, strerror(errno), errno);
return prelinked;
}
void setup_prelink_info(const char *fname, int elf_little, long base)
{
FAILIF(sizeof(prelink_info_t) != 8, "Unexpected sizeof(prelink_info_t) == %d!\n", sizeof(prelink_info_t));
int fd = open(fname, O_WRONLY);
FAILIF(fd < 0,
"open(%s, O_WRONLY): %s (%d)\n" ,
fname, strerror(errno), errno);
prelink_info_t info;
off_t sz = lseek(fd, 0, SEEK_END);
FAILIF(sz == (off_t)-1,
"lseek(%d, 0, SEEK_END): %s (%d)!\n",
fd, strerror(errno), errno);
if (!(elf_little ^ is_host_little())) {
/* Same endianness */
INFO("Host and ELF file [%s] have same endianness.\n", fname);
info.mmap_addr = base;
}
else {
/* Different endianness */
INFO("Host and ELF file [%s] have different endianness.\n", fname);
info.mmap_addr = switch_endianness(base);
}
strncpy(info.tag, "PRE ", 4);
int num_written = write(fd, &info, sizeof(info));
FAILIF(num_written < 0,
"write(%d, &info, sizeof(info)): %s (%d)\n",
fd, strerror(errno), errno);
FAILIF(sizeof(info) != num_written,
"Could not write %d bytes (wrote only %d bytes) as expected!\n",
sizeof(info), num_written);
FAILIF(close(fd) < 0, "close(%d): %s (%d)!\n", fd, strerror(errno), errno);
}
#endif /*SUPPORT_ANDROID_PRELINK_TAGS*/
|
