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6f121e54 AL |
1 | #include <inttypes.h> |
2 | #include <stdint.h> | |
3 | #include <unistd.h> | |
4 | #include <stdarg.h> | |
5 | #include <stdlib.h> | |
6 | #include <stdio.h> | |
7 | #include <string.h> | |
8 | #include <fcntl.h> | |
9 | #include <err.h> | |
10 | ||
11 | #include <sys/mman.h> | |
12 | #include <sys/types.h> | |
13 | ||
bdfb9bcc PA |
14 | #include <tools/le_byteshift.h> |
15 | ||
6f121e54 AL |
16 | #include <linux/elf.h> |
17 | #include <linux/types.h> | |
18 | ||
01156183 AL |
19 | const char *outfilename; |
20 | ||
6f121e54 | 21 | /* Symbols that we need in vdso2c. */ |
18d0a6fd AL |
22 | enum { |
23 | sym_vvar_page, | |
24 | sym_hpet_page, | |
25 | sym_end_mapping, | |
26 | }; | |
27 | ||
28 | const int special_pages[] = { | |
29 | sym_vvar_page, | |
30 | sym_hpet_page, | |
31 | }; | |
32 | ||
6f121e54 | 33 | char const * const required_syms[] = { |
18d0a6fd AL |
34 | [sym_vvar_page] = "vvar_page", |
35 | [sym_hpet_page] = "hpet_page", | |
36 | [sym_end_mapping] = "end_mapping", | |
6f121e54 AL |
37 | "VDSO32_NOTE_MASK", |
38 | "VDSO32_SYSENTER_RETURN", | |
39 | "__kernel_vsyscall", | |
40 | "__kernel_sigreturn", | |
41 | "__kernel_rt_sigreturn", | |
42 | }; | |
43 | ||
44 | __attribute__((format(printf, 1, 2))) __attribute__((noreturn)) | |
45 | static void fail(const char *format, ...) | |
46 | { | |
47 | va_list ap; | |
48 | va_start(ap, format); | |
49 | fprintf(stderr, "Error: "); | |
50 | vfprintf(stderr, format, ap); | |
01156183 | 51 | unlink(outfilename); |
6f121e54 AL |
52 | exit(1); |
53 | va_end(ap); | |
54 | } | |
55 | ||
add4eed0 | 56 | /* |
b4b31f61 | 57 | * Evil macros for little-endian reads and writes |
add4eed0 | 58 | */ |
c191920f | 59 | #define GLE(x, bits, ifnot) \ |
add4eed0 | 60 | __builtin_choose_expr( \ |
bdfb9bcc PA |
61 | (sizeof(*(x)) == bits/8), \ |
62 | (__typeof__(*(x)))get_unaligned_le##bits(x), ifnot) | |
add4eed0 | 63 | |
bdfb9bcc | 64 | extern void bad_get_le(void); |
b4b31f61 | 65 | #define LAST_GLE(x) \ |
bdfb9bcc | 66 | __builtin_choose_expr(sizeof(*(x)) == 1, *(x), bad_get_le()) |
add4eed0 | 67 | |
c191920f | 68 | #define GET_LE(x) \ |
b4b31f61 AL |
69 | GLE(x, 64, GLE(x, 32, GLE(x, 16, LAST_GLE(x)))) |
70 | ||
71 | #define PLE(x, val, bits, ifnot) \ | |
72 | __builtin_choose_expr( \ | |
73 | (sizeof(*(x)) == bits/8), \ | |
74 | put_unaligned_le##bits((val), (x)), ifnot) | |
75 | ||
76 | extern void bad_put_le(void); | |
77 | #define LAST_PLE(x, val) \ | |
78 | __builtin_choose_expr(sizeof(*(x)) == 1, *(x) = (val), bad_put_le()) | |
79 | ||
80 | #define PUT_LE(x, val) \ | |
81 | PLE(x, val, 64, PLE(x, val, 32, PLE(x, val, 16, LAST_PLE(x, val)))) | |
82 | ||
add4eed0 | 83 | |
6f121e54 AL |
84 | #define NSYMS (sizeof(required_syms) / sizeof(required_syms[0])) |
85 | ||
c1979c37 AL |
86 | #define BITSFUNC3(name, bits) name##bits |
87 | #define BITSFUNC2(name, bits) BITSFUNC3(name, bits) | |
88 | #define BITSFUNC(name) BITSFUNC2(name, ELF_BITS) | |
89 | ||
90 | #define ELF_BITS_XFORM2(bits, x) Elf##bits##_##x | |
91 | #define ELF_BITS_XFORM(bits, x) ELF_BITS_XFORM2(bits, x) | |
92 | #define ELF(x) ELF_BITS_XFORM(ELF_BITS, x) | |
93 | ||
94 | #define ELF_BITS 64 | |
6f121e54 | 95 | #include "vdso2c.h" |
c1979c37 AL |
96 | #undef ELF_BITS |
97 | ||
98 | #define ELF_BITS 32 | |
6f121e54 | 99 | #include "vdso2c.h" |
c1979c37 | 100 | #undef ELF_BITS |
6f121e54 | 101 | |
01156183 | 102 | static void go(void *addr, size_t len, FILE *outfile, const char *name) |
6f121e54 AL |
103 | { |
104 | Elf64_Ehdr *hdr = (Elf64_Ehdr *)addr; | |
105 | ||
106 | if (hdr->e_ident[EI_CLASS] == ELFCLASS64) { | |
01156183 | 107 | go64(addr, len, outfile, name); |
6f121e54 | 108 | } else if (hdr->e_ident[EI_CLASS] == ELFCLASS32) { |
01156183 | 109 | go32(addr, len, outfile, name); |
6f121e54 | 110 | } else { |
01156183 | 111 | fail("unknown ELF class\n"); |
6f121e54 AL |
112 | } |
113 | } | |
114 | ||
115 | int main(int argc, char **argv) | |
116 | { | |
117 | int fd; | |
118 | off_t len; | |
119 | void *addr; | |
120 | FILE *outfile; | |
6f121e54 AL |
121 | char *name, *tmp; |
122 | int namelen; | |
123 | ||
124 | if (argc != 3) { | |
125 | printf("Usage: vdso2c INPUT OUTPUT\n"); | |
126 | return 1; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Figure out the struct name. If we're writing to a .so file, | |
131 | * generate raw output insted. | |
132 | */ | |
133 | name = strdup(argv[2]); | |
134 | namelen = strlen(name); | |
135 | if (namelen >= 3 && !strcmp(name + namelen - 3, ".so")) { | |
136 | name = NULL; | |
137 | } else { | |
138 | tmp = strrchr(name, '/'); | |
139 | if (tmp) | |
140 | name = tmp + 1; | |
141 | tmp = strchr(name, '.'); | |
142 | if (tmp) | |
143 | *tmp = '\0'; | |
144 | for (tmp = name; *tmp; tmp++) | |
145 | if (*tmp == '-') | |
146 | *tmp = '_'; | |
147 | } | |
148 | ||
149 | fd = open(argv[1], O_RDONLY); | |
150 | if (fd == -1) | |
151 | err(1, "%s", argv[1]); | |
152 | ||
153 | len = lseek(fd, 0, SEEK_END); | |
154 | if (len == (off_t)-1) | |
155 | err(1, "lseek"); | |
156 | ||
157 | addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); | |
158 | if (addr == MAP_FAILED) | |
159 | err(1, "mmap"); | |
160 | ||
01156183 AL |
161 | outfilename = argv[2]; |
162 | outfile = fopen(outfilename, "w"); | |
6f121e54 AL |
163 | if (!outfile) |
164 | err(1, "%s", argv[2]); | |
165 | ||
01156183 | 166 | go(addr, (size_t)len, outfile, name); |
6f121e54 AL |
167 | |
168 | munmap(addr, len); | |
169 | fclose(outfile); | |
170 | ||
01156183 | 171 | return 0; |
6f121e54 | 172 | } |