#include <stdio.h>
#include <sys/utsname.h>
#include "common.h"
#include "../util/util.h"
#include "../util/debug.h"

const char *const arm_triplets[] = {
	"arm-eabi-",
	"arm-linux-androideabi-",
	"arm-unknown-linux-",
	"arm-unknown-linux-gnu-",
	"arm-unknown-linux-gnueabi-",
	"arm-linux-gnu-",
	"arm-linux-gnueabihf-",
	"arm-none-eabi-",
	NULL
};

const char *const arm64_triplets[] = {
	"aarch64-linux-android-",
	"aarch64-linux-gnu-",
	NULL
};

const char *const powerpc_triplets[] = {
	"powerpc-unknown-linux-gnu-",
	"powerpc64-unknown-linux-gnu-",
	"powerpc64-linux-gnu-",
	"powerpc64le-linux-gnu-",
	NULL
};

const char *const s390_triplets[] = {
	"s390-ibm-linux-",
	"s390x-linux-gnu-",
	NULL
};

const char *const sh_triplets[] = {
	"sh-unknown-linux-gnu-",
	"sh64-unknown-linux-gnu-",
	"sh-linux-gnu-",
	"sh64-linux-gnu-",
	NULL
};

const char *const sparc_triplets[] = {
	"sparc-unknown-linux-gnu-",
	"sparc64-unknown-linux-gnu-",
	"sparc64-linux-gnu-",
	NULL
};

const char *const x86_triplets[] = {
	"x86_64-pc-linux-gnu-",
	"x86_64-unknown-linux-gnu-",
	"i686-pc-linux-gnu-",
	"i586-pc-linux-gnu-",
	"i486-pc-linux-gnu-",
	"i386-pc-linux-gnu-",
	"i686-linux-android-",
	"i686-android-linux-",
	"x86_64-linux-gnu-",
	"i586-linux-gnu-",
	NULL
};

const char *const mips_triplets[] = {
	"mips-unknown-linux-gnu-",
	"mipsel-linux-android-",
	"mips-linux-gnu-",
	"mips64-linux-gnu-",
	"mips64el-linux-gnuabi64-",
	"mips64-linux-gnuabi64-",
	"mipsel-linux-gnu-",
	NULL
};

static bool lookup_path(char *name)
{
	bool found = false;
	char *path, *tmp = NULL;
	char buf[PATH_MAX];
	char *env = getenv("PATH");

	if (!env)
		return false;

	env = strdup(env);
	if (!env)
		return false;

	path = strtok_r(env, ":", &tmp);
	while (path) {
		scnprintf(buf, sizeof(buf), "%s/%s", path, name);
		if (access(buf, F_OK) == 0) {
			found = true;
			break;
		}
		path = strtok_r(NULL, ":", &tmp);
	}
	free(env);
	return found;
}

static int lookup_triplets(const char *const *triplets, const char *name)
{
	int i;
	char buf[PATH_MAX];

	for (i = 0; triplets[i] != NULL; i++) {
		scnprintf(buf, sizeof(buf), "%s%s", triplets[i], name);
		if (lookup_path(buf))
			return i;
	}
	return -1;
}

/*
 * Return architecture name in a normalized form.
 * The conversion logic comes from the Makefile.
 */
const char *normalize_arch(char *arch)
{
	if (!strcmp(arch, "x86_64"))
		return "x86";
	if (arch[0] == 'i' && arch[2] == '8' && arch[3] == '6')
		return "x86";
	if (!strcmp(arch, "sun4u") || !strncmp(arch, "sparc", 5))
		return "sparc";
	if (!strcmp(arch, "aarch64") || !strcmp(arch, "arm64"))
		return "arm64";
	if (!strncmp(arch, "arm", 3) || !strcmp(arch, "sa110"))
		return "arm";
	if (!strncmp(arch, "s390", 4))
		return "s390";
	if (!strncmp(arch, "parisc", 6))
		return "parisc";
	if (!strncmp(arch, "powerpc", 7) || !strncmp(arch, "ppc", 3))
		return "powerpc";
	if (!strncmp(arch, "mips", 4))
		return "mips";
	if (!strncmp(arch, "sh", 2) && isdigit(arch[2]))
		return "sh";

	return arch;
}

static int perf_env__lookup_binutils_path(struct perf_env *env,
					  const char *name, const char **path)
{
	int idx;
	const char *arch, *cross_env;
	struct utsname uts;
	const char *const *path_list;
	char *buf = NULL;

	arch = normalize_arch(env->arch);

	if (uname(&uts) < 0)
		goto out;

	/*
	 * We don't need to try to find objdump path for native system.
	 * Just use default binutils path (e.g.: "objdump").
	 */
	if (!strcmp(normalize_arch(uts.machine), arch))
		goto out;

	cross_env = getenv("CROSS_COMPILE");
	if (cross_env) {
		if (asprintf(&buf, "%s%s", cross_env, name) < 0)
			goto out_error;
		if (buf[0] == '/') {
			if (access(buf, F_OK) == 0)
				goto out;
			goto out_error;
		}
		if (lookup_path(buf))
			goto out;
		zfree(&buf);
	}

	if (!strcmp(arch, "arm"))
		path_list = arm_triplets;
	else if (!strcmp(arch, "arm64"))
		path_list = arm64_triplets;
	else if (!strcmp(arch, "powerpc"))
		path_list = powerpc_triplets;
	else if (!strcmp(arch, "sh"))
		path_list = sh_triplets;
	else if (!strcmp(arch, "s390"))
		path_list = s390_triplets;
	else if (!strcmp(arch, "sparc"))
		path_list = sparc_triplets;
	else if (!strcmp(arch, "x86"))
		path_list = x86_triplets;
	else if (!strcmp(arch, "mips"))
		path_list = mips_triplets;
	else {
		ui__error("binutils for %s not supported.\n", arch);
		goto out_error;
	}

	idx = lookup_triplets(path_list, name);
	if (idx < 0) {
		ui__error("Please install %s for %s.\n"
			  "You can add it to PATH, set CROSS_COMPILE or "
			  "override the default using --%s.\n",
			  name, arch, name);
		goto out_error;
	}

	if (asprintf(&buf, "%s%s", path_list[idx], name) < 0)
		goto out_error;

out:
	*path = buf;
	return 0;
out_error:
	free(buf);
	*path = NULL;
	return -1;
}

int perf_env__lookup_objdump(struct perf_env *env)
{
	/*
	 * For live mode, env->arch will be NULL and we can use
	 * the native objdump tool.
	 */
	if (env->arch == NULL)
		return 0;

	return perf_env__lookup_binutils_path(env, "objdump", &objdump_path);
}
></table>
<div class='commit-subject'>MIPS: Disable preemption during prctl(PR_SET_FP_MODE, ...)</div><div class='commit-msg'>Whilst a PR_SET_FP_MODE prctl is performed there are decisions made
based upon whether the task is executing on the current CPU. This may
change if we're preempted, so disable preemption to avoid such changes
for the lifetime of the mode switch.

Signed-off-by: Paul Burton &lt;paul.burton@imgtec.com&gt;
Fixes: 9791554b45a2 ("MIPS,prctl: add PR_[GS]ET_FP_MODE prctl options for MIPS")
Reviewed-by: Maciej W. Rozycki &lt;macro@imgtec.com&gt;
Tested-by: Aurelien Jarno &lt;aurelien@aurel32.net&gt;
Cc: Adam Buchbinder &lt;adam.buchbinder@gmail.com&gt;
Cc: James Hogan &lt;james.hogan@imgtec.com&gt;
Cc: stable &lt;stable@vger.kernel.org&gt; # v4.0+
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13144/
Signed-off-by: Ralf Baechle &lt;ralf@linux-mips.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=bd239f1e1429e7781096bf3884bdb1b2b1bb4f28'>Diffstat</a></div><table summary='diffstat' class='diffstat'>