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#include <inttypes.h>
#include <stdint.h>
#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <err.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <linux/elf.h>
#include <linux/types.h>
/* Symbols that we need in vdso2c. */
char const * const required_syms[] = {
"VDSO32_NOTE_MASK",
"VDSO32_SYSENTER_RETURN",
"__kernel_vsyscall",
"__kernel_sigreturn",
"__kernel_rt_sigreturn",
};
__attribute__((format(printf, 1, 2))) __attribute__((noreturn))
static void fail(const char *format, ...)
{
va_list ap;
va_start(ap, format);
fprintf(stderr, "Error: ");
vfprintf(stderr, format, ap);
exit(1);
va_end(ap);
}
#define NSYMS (sizeof(required_syms) / sizeof(required_syms[0]))
#define BITS 64
#define GOFUNC go64
#define Elf_Ehdr Elf64_Ehdr
#define Elf_Shdr Elf64_Shdr
#define Elf_Phdr Elf64_Phdr
#define Elf_Sym Elf64_Sym
#define Elf_Dyn Elf64_Dyn
#include "vdso2c.h"
#undef BITS
#undef GOFUNC
#undef Elf_Ehdr
#undef Elf_Shdr
#undef Elf_Phdr
#undef Elf_Sym
#undef Elf_Dyn
#define BITS 32
#define GOFUNC go32
#define Elf_Ehdr Elf32_Ehdr
#define Elf_Shdr Elf32_Shdr
#define Elf_Phdr Elf32_Phdr
#define Elf_Sym Elf32_Sym
#define Elf_Dyn Elf32_Dyn
#include "vdso2c.h"
#undef BITS
#undef GOFUNC
#undef Elf_Ehdr
#undef Elf_Shdr
#undef Elf_Phdr
#undef Elf_Sym
#undef Elf_Dyn
static int go(void *addr, size_t len, FILE *outfile, const char *name)
{
Elf64_Ehdr *hdr = (Elf64_Ehdr *)addr;
if (hdr->e_ident[EI_CLASS] == ELFCLASS64) {
return go64(addr, len, outfile, name);
} else if (hdr->e_ident[EI_CLASS] == ELFCLASS32) {
return go32(addr, len, outfile, name);
} else {
fprintf(stderr, "Error: unknown ELF class\n");
return 1;
}
}
int main(int argc, char **argv)
{
int fd;
off_t len;
void *addr;
FILE *outfile;
int ret;
char *name, *tmp;
int namelen;
if (argc != 3) {
printf("Usage: vdso2c INPUT OUTPUT\n");
return 1;
}
/*
* Figure out the struct name. If we're writing to a .so file,
* generate raw output insted.
*/
name = strdup(argv[2]);
namelen = strlen(name);
if (namelen >= 3 && !strcmp(name + namelen - 3, ".so")) {
name = NULL;
} else {
tmp = strrchr(name, '/');
if (tmp)
name = tmp + 1;
tmp = strchr(name, '.');
if (tmp)
*tmp = '\0';
for (tmp = name; *tmp; tmp++)
if (*tmp == '-')
*tmp = '_';
}
fd = open(argv[1], O_RDONLY);
if (fd == -1)
err(1, "%s", argv[1]);
len = lseek(fd, 0, SEEK_END);
if (len == (off_t)-1)
err(1, "lseek");
addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
if (addr == MAP_FAILED)
err(1, "mmap");
outfile = fopen(argv[2], "w");
if (!outfile)
err(1, "%s", argv[2]);
ret = go(addr, (size_t)len, outfile, name);
munmap(addr, len);
fclose(outfile);
return ret;
}
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