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-rw-r--r--toolchain/toolchain-wrapper.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/toolchain/toolchain-wrapper.c b/toolchain/toolchain-wrapper.c
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index 0000000000..ac40decd57
--- /dev/null
+++ b/toolchain/toolchain-wrapper.c
@@ -0,0 +1,258 @@
+/**
+ * Buildroot wrapper for toolchains. This simply executes the real toolchain
+ * with a number of arguments (sysroot/arch/..) hardcoded, to ensure the
+ * toolchain uses the correct configuration.
+ * The hardcoded path arguments are defined relative to the actual location
+ * of the binary.
+ *
+ * (C) 2011 Peter Korsgaard <jacmet@sunsite.dk>
+ * (C) 2011 Daniel Nyström <daniel.nystrom@timeterminal.se>
+ * (C) 2012 Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
+ * (C) 2013 Spenser Gilliland <spenser@gillilanding.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+
+static char path[PATH_MAX];
+static char sysroot[PATH_MAX];
+
+/**
+ * GCC errors out with certain combinations of arguments (examples are
+ * -mfloat-abi={hard|soft} and -m{little|big}-endian), so we have to ensure
+ * that we only pass the predefined one to the real compiler if the inverse
+ * option isn't in the argument list.
+ * This specifies the worst case number of extra arguments we might pass
+ * Currently, we have:
+ * -mfloat-abi=
+ * -march=
+ * -mcpu=
+ */
+#define EXCLUSIVE_ARGS 3
+
+static char *predef_args[] = {
+ path,
+ "--sysroot", sysroot,
+#ifdef BR_ABI
+ "-mabi=" BR_ABI,
+#endif
+#ifdef BR_FPU
+ "-mfpu=" BR_FPU,
+#endif
+#ifdef BR_SOFTFLOAT
+ "-msoft-float",
+#endif /* BR_SOFTFLOAT */
+#ifdef BR_MODE
+ "-m" BR_MODE,
+#endif
+#ifdef BR_64
+ "-m64",
+#endif
+#ifdef BR_BINFMT_FLAT
+ "-Wl,-elf2flt",
+#endif
+#ifdef BR_MIPS_TARGET_LITTLE_ENDIAN
+ "-EL",
+#endif
+#if defined(BR_MIPS_TARGET_BIG_ENDIAN) || defined(BR_ARC_TARGET_BIG_ENDIAN)
+ "-EB",
+#endif
+#ifdef BR_ADDITIONAL_CFLAGS
+ BR_ADDITIONAL_CFLAGS
+#endif
+};
+
+static void check_unsafe_path(const char *path, int paranoid)
+{
+ char **c;
+ static char *unsafe_paths[] = {
+ "/lib", "/usr/include", "/usr/lib", "/usr/local/include", "/usr/local/lib", NULL,
+ };
+
+ for (c = unsafe_paths; *c != NULL; c++) {
+ if (!strncmp(path, *c, strlen(*c))) {
+ fprintf(stderr, "%s: %s: unsafe header/library path used in cross-compilation: '%s'\n",
+ program_invocation_short_name,
+ paranoid ? "ERROR" : "WARNING", path);
+ if (paranoid)
+ exit(1);
+ continue;
+ }
+ }
+}
+
+int main(int argc, char **argv)
+{
+ char **args, **cur;
+ char *relbasedir, *absbasedir;
+ char *progpath = argv[0];
+ char *basename;
+ char *env_debug;
+ char *paranoid_wrapper;
+ int paranoid;
+ int ret, i, count = 0, debug;
+
+ /* Calculate the relative paths */
+ basename = strrchr(progpath, '/');
+ if (basename) {
+ *basename = '\0';
+ basename++;
+ relbasedir = malloc(strlen(progpath) + 7);
+ if (relbasedir == NULL) {
+ perror(__FILE__ ": malloc");
+ return 2;
+ }
+ sprintf(relbasedir, "%s/../..", argv[0]);
+ absbasedir = realpath(relbasedir, NULL);
+ } else {
+ basename = progpath;
+ absbasedir = malloc(PATH_MAX + 1);
+ ret = readlink("/proc/self/exe", absbasedir, PATH_MAX);
+ if (ret < 0) {
+ perror(__FILE__ ": readlink");
+ return 2;
+ }
+ absbasedir[ret] = '\0';
+ for (i = ret; i > 0; i--) {
+ if (absbasedir[i] == '/') {
+ absbasedir[i] = '\0';
+ if (++count == 3)
+ break;
+ }
+ }
+ }
+ if (absbasedir == NULL) {
+ perror(__FILE__ ": realpath");
+ return 2;
+ }
+
+ /* Fill in the relative paths */
+#ifdef BR_CROSS_PATH_REL
+ ret = snprintf(path, sizeof(path), "%s/" BR_CROSS_PATH_REL "/%s", absbasedir, basename);
+#else /* BR_CROSS_PATH_ABS */
+ ret = snprintf(path, sizeof(path), BR_CROSS_PATH_ABS "/%s", basename);
+#endif
+ if (ret >= sizeof(path)) {
+ perror(__FILE__ ": overflow");
+ return 3;
+ }
+ ret = snprintf(sysroot, sizeof(sysroot), "%s/" BR_SYSROOT, absbasedir);
+ if (ret >= sizeof(sysroot)) {
+ perror(__FILE__ ": overflow");
+ return 3;
+ }
+
+ cur = args = malloc(sizeof(predef_args) +
+ (sizeof(char *) * (argc + EXCLUSIVE_ARGS)));
+ if (args == NULL) {
+ perror(__FILE__ ": malloc");
+ return 2;
+ }
+
+ /* start with predefined args */
+ memcpy(cur, predef_args, sizeof(predef_args));
+ cur += sizeof(predef_args) / sizeof(predef_args[0]);
+
+#ifdef BR_FLOAT_ABI
+ /* add float abi if not overridden in args */
+ for (i = 1; i < argc; i++) {
+ if (!strncmp(argv[i], "-mfloat-abi=", strlen("-mfloat-abi=")) ||
+ !strcmp(argv[i], "-msoft-float") ||
+ !strcmp(argv[i], "-mhard-float"))
+ break;
+ }
+
+ if (i == argc)
+ *cur++ = "-mfloat-abi=" BR_FLOAT_ABI;
+#endif
+
+#if defined(BR_ARCH) || \
+ defined(BR_CPU)
+ /* Add our -march/cpu flags, but only if none of
+ * -march/mtune/mcpu are already specified on the commandline
+ */
+ for (i = 1; i < argc; i++) {
+ if (!strncmp(argv[i], "-march=", strlen("-march=")) ||
+ !strncmp(argv[i], "-mtune=", strlen("-mtune=")) ||
+ !strncmp(argv[i], "-mcpu=", strlen("-mcpu=" )))
+ break;
+ }
+ if (i == argc) {
+#ifdef BR_ARCH
+ *cur++ = "-march=" BR_ARCH;
+#endif
+#ifdef BR_CPU
+ *cur++ = "-mcpu=" BR_CPU;
+#endif
+ }
+#endif /* ARCH || CPU */
+
+ paranoid_wrapper = getenv("BR_COMPILER_PARANOID_UNSAFE_PATH");
+ if (paranoid_wrapper && strlen(paranoid_wrapper) > 0)
+ paranoid = 1;
+ else
+ paranoid = 0;
+
+ /* Check for unsafe library and header paths */
+ for (i = 1; i < argc; i++) {
+
+ /* Skip options that do not start with -I and -L */
+ if (strncmp(argv[i], "-I", 2) && strncmp(argv[i], "-L", 2))
+ continue;
+
+ /* We handle two cases: first the case where -I/-L and
+ * the path are separated by one space and therefore
+ * visible as two separate options, and then the case
+ * where they are stuck together forming one single
+ * option.
+ */
+ if (argv[i][2] == '\0') {
+ i++;
+ if (i == argc)
+ continue;
+ check_unsafe_path(argv[i], paranoid);
+ } else {
+ check_unsafe_path(argv[i] + 2, paranoid);
+ }
+ }
+
+ /* append forward args */
+ memcpy(cur, &argv[1], sizeof(char *) * (argc - 1));
+ cur += argc - 1;
+
+ /* finish with NULL termination */
+ *cur = NULL;
+
+ /* Debug the wrapper to see actual arguments passed to
+ * the compiler:
+ * unset, empty, or 0: do not trace
+ * set to 1 : trace all arguments on a single line
+ * set to 2 : trace one argument per line
+ */
+ if ((env_debug = getenv("BR2_DEBUG_WRAPPER"))) {
+ debug = atoi(env_debug);
+ if (debug > 0) {
+ fprintf(stderr, "Toolchain wrapper executing:");
+ for (i = 0; args[i]; i++)
+ fprintf(stderr, "%s'%s'",
+ (debug == 2) ? "\n " : " ", args[i]);
+ fprintf(stderr, "\n");
+ }
+ }
+
+ if (execv(path, args))
+ perror(path);
+
+ free(args);
+
+ return 2;
+}