12 #include <sys/types.h>
14 #include <tools/le_byteshift.h>
16 #include <linux/elf.h>
17 #include <linux/types.h>
19 const char *outfilename;
21 /* Symbols that we need in vdso2c. */
28 const int special_pages[] = {
33 char const * const required_syms[] = {
34 [sym_vvar_page] = "vvar_page",
35 [sym_hpet_page] = "hpet_page",
36 [sym_end_mapping] = "end_mapping",
38 "VDSO32_SYSENTER_RETURN",
41 "__kernel_rt_sigreturn",
44 __attribute__((format(printf, 1, 2))) __attribute__((noreturn))
45 static void fail(const char *format, ...)
49 fprintf(stderr, "Error: ");
50 vfprintf(stderr, format, ap);
57 * Evil macros to do a little-endian read.
59 #define GLE(x, bits, ifnot) \
60 __builtin_choose_expr( \
61 (sizeof(*(x)) == bits/8), \
62 (__typeof__(*(x)))get_unaligned_le##bits(x), ifnot)
64 extern void bad_get_le(void);
66 __builtin_choose_expr(sizeof(*(x)) == 1, *(x), bad_get_le())
69 GLE(x, 64, GLE(x, 32, GLE(x, 16, LAST_LE(x))))
71 #define NSYMS (sizeof(required_syms) / sizeof(required_syms[0]))
75 #define Elf_Ehdr Elf64_Ehdr
76 #define Elf_Shdr Elf64_Shdr
77 #define Elf_Phdr Elf64_Phdr
78 #define Elf_Sym Elf64_Sym
79 #define Elf_Dyn Elf64_Dyn
91 #define Elf_Ehdr Elf32_Ehdr
92 #define Elf_Shdr Elf32_Shdr
93 #define Elf_Phdr Elf32_Phdr
94 #define Elf_Sym Elf32_Sym
95 #define Elf_Dyn Elf32_Dyn
105 static void go(void *addr, size_t len, FILE *outfile, const char *name)
107 Elf64_Ehdr *hdr = (Elf64_Ehdr *)addr;
109 if (hdr->e_ident[EI_CLASS] == ELFCLASS64) {
110 go64(addr, len, outfile, name);
111 } else if (hdr->e_ident[EI_CLASS] == ELFCLASS32) {
112 go32(addr, len, outfile, name);
114 fail("unknown ELF class\n");
118 int main(int argc, char **argv)
128 printf("Usage: vdso2c INPUT OUTPUT\n");
133 * Figure out the struct name. If we're writing to a .so file,
134 * generate raw output insted.
136 name = strdup(argv[2]);
137 namelen = strlen(name);
138 if (namelen >= 3 && !strcmp(name + namelen - 3, ".so")) {
141 tmp = strrchr(name, '/');
144 tmp = strchr(name, '.');
147 for (tmp = name; *tmp; tmp++)
152 fd = open(argv[1], O_RDONLY);
154 err(1, "%s", argv[1]);
156 len = lseek(fd, 0, SEEK_END);
157 if (len == (off_t)-1)
160 addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
161 if (addr == MAP_FAILED)
164 outfilename = argv[2];
165 outfile = fopen(outfilename, "w");
167 err(1, "%s", argv[2]);
169 go(addr, (size_t)len, outfile, name);