1a53708166
When using qemu's linux-user binaries through binfmt, argv[0] gets lost along the execution because qemu only gets passed in the full file name to the executable while argv[0] can be something completely different. This breaks in some subtile situations, such as the grep and make test suites. This patch adds a wrapper binary called qemu-$TARGET-binfmt that can be used with binfmt's P flag which passes the full path _and_ argv[0] to the binfmt handler. The binary would be smart enough to be versatile and only exist in the system once, creating the qemu binary path names from its own argv[0]. However, this seemed like it didn't fit the make system too well, so we're currently creating a new binary for each target archictecture. CC: Reinhard Max <max@suse.de> Signed-off-by: Alexander Graf <agraf@suse.de> [AF: Rebased onto new Makefile infrastructure] Signed-off-by: Andreas Färber <afaerber@suse.de>
43 lines
1.0 KiB
C
43 lines
1.0 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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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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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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