910d3309da
When we have a working host binary equivalent for the guest binary we're trying to run, let's just use that instead as it will be a lot faster. Signed-off-by: Alexander Graf <agraf@suse.de>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
#include <stdio.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <libgen.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef __x86_64__
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#define ARCH_NAME "x86_64"
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#endif
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int main(int argc, char **argv, char **envp)
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{
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char *binfmt;
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char **new_argv;
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/*
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* Check if our file name ends with -binfmt
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*/
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binfmt = argv[0] + strlen(argv[0]) - strlen("-binfmt");
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if (strcmp(binfmt, "-binfmt")) {
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fprintf(stderr, "%s: Invalid executable name\n", argv[0]);
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exit(1);
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}
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if (argc < 3) {
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fprintf(stderr, "%s: Please use me through binfmt with P flag\n",
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argv[0]);
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exit(1);
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}
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binfmt[0] = '\0';
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/* Now argv[0] is the real qemu binary name */
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#ifdef ARCH_NAME
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{
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char *hostbin;
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char *guestarch;
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int r;
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guestarch = strrchr(argv[0], '-') ;
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if (!guestarch) {
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goto skip;
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}
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guestarch++;
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r = asprintf(&hostbin, "/emul/" ARCH_NAME "-for-%s/%s", guestarch, argv[1]);
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if ((r > 0) && !access(hostbin, X_OK)) {
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/*
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* We found a host binary replacement for the non-host binary. Let's
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* use that instead!
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*/
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return execve(hostbin, &argv[2], envp);
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}
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}
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skip:
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#endif
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new_argv = (char **)malloc((argc + 2) * sizeof(*new_argv));
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if (argc > 3) {
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memcpy(&new_argv[4], &argv[3], (argc - 3) * sizeof(*new_argv));
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}
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new_argv[0] = argv[0];
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new_argv[1] = (char *)"-0";
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new_argv[2] = argv[2];
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new_argv[3] = argv[1];
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new_argv[argc + 1] = NULL;
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return execve(new_argv[0], new_argv, envp);
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}
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