common.c

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// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include "common.h"
#include "../util/env.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-",
    "powerpc-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;
}

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

    /*
     * We don't need to try to find objdump path for native system.
     * Just use default binutils path (e.g.: "objdump").
     */
    if (!strcmp(perf_env__arch(NULL), 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, const char **path)
{
    /*
     * 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", path);
}