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#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
#include <libgen.h>
#include <string.h>
#include <stdlib.h>
#ifdef __x86_64__
#define ARCH_NAME "x86_64"
#endif
int main(int argc, char **argv, char **envp)
{
char *binfmt;
char **new_argv;
/*
* Check if our file name ends with -binfmt
*/
binfmt = argv[0] + strlen(argv[0]) - strlen("-binfmt");
if (strcmp(binfmt, "-binfmt")) {
fprintf(stderr, "%s: Invalid executable name\n", argv[0]);
exit(1);
}
if (argc < 3) {
fprintf(stderr, "%s: Please use me through binfmt with P flag\n",
argv[0]);
exit(1);
}
binfmt[0] = '\0';
/* Now argv[0] is the real qemu binary name */
#ifdef ARCH_NAME
{
char *hostbin;
char *guestarch;
int r;
guestarch = strrchr(argv[0], '-') ;
if (!guestarch) {
goto skip;
}
guestarch++;
r = asprintf(&hostbin, "/emul/" ARCH_NAME "-for-%s/%s", guestarch, argv[1]);
if ((r > 0) && !access(hostbin, X_OK)) {
/*
* We found a host binary replacement for the non-host binary. Let's
* use that instead!
*/
return execve(hostbin, &argv[2], envp);
}
}
skip:
#endif
new_argv = (char **)malloc((argc + 2) * sizeof(*new_argv));
if (argc > 3) {
memcpy(&new_argv[4], &argv[3], (argc - 3) * sizeof(*new_argv));
}
new_argv[0] = argv[0];
new_argv[1] = (char *)"-0";
new_argv[2] = argv[2];
new_argv[3] = argv[1];
new_argv[argc + 1] = NULL;
return execve(new_argv[0], new_argv, envp);
}
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