// SPDX-License-Identifier: GPL-2.0
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "common.h"
#include "../util/env.h"
#include "../util/debug.h"
#include <linux/zalloc.h>

const char *const arc_triplets[] = {
        "arc-linux-",
        "arc-snps-linux-uclibc-",
        "arc-snps-linux-gnu-",
        NULL
};

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, "arc"))
                path_list = arc_triplets;
        else 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);
}

/*
 * Some architectures have a single address space for kernel and user addresses,
 * which makes it possible to determine if an address is in kernel space or user
 * space.
 */
bool perf_env__single_address_space(struct perf_env *env)
{
        return strcmp(perf_env__arch(env), "sparc");
}