// SPDX-License-Identifier: GPL-2.0#include "common.h" #include <limits.h>#include <stdio.h>#include <stdlib.h>#include <string.h> #include <linux/zalloc.h>#include <unistd.h> #include <dwarf-regs.h> #include "../util/debug.h"#include "../util/env.h" static const char *const arc_triplets[] = {	"arc-linux-",	"arc-snps-linux-uclibc-",	"arc-snps-linux-gnu-",	NULL}; static 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}; static const char *const arm64_triplets[] = {	"aarch64-linux-android-",	"aarch64-linux-gnu-",	NULL}; static const char *const powerpc_triplets[] = {	"powerpc-unknown-linux-gnu-",	"powerpc-linux-gnu-",	"powerpc64-unknown-linux-gnu-",	"powerpc64-linux-gnu-",	"powerpc64le-linux-gnu-",	NULL}; static const char *const riscv32_triplets[] = {	"riscv32-unknown-linux-gnu-",	"riscv32-linux-android-",	"riscv32-linux-gnu-",	NULL}; static const char *const riscv64_triplets[] = {	"riscv64-unknown-linux-gnu-",	"riscv64-linux-android-",	"riscv64-linux-gnu-",	NULL}; static const char *const s390_triplets[] = {	"s390-ibm-linux-",	"s390x-linux-gnu-",	NULL}; static const char *const sh_triplets[] = {	"sh-unknown-linux-gnu-",	"sh-linux-gnu-",	NULL}; static const char *const sparc_triplets[] = {	"sparc-unknown-linux-gnu-",	"sparc64-unknown-linux-gnu-",	"sparc64-linux-gnu-",	NULL}; static 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}; static 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 bool is_native_compatible(struct perf_env *env, uint16_t target, uint16_t host){	if (target != host) {		/* A 64-bit host can natively disassemble its 32-bit compat architecture */		if (host == EM_X86_64 && target == EM_386)			return true;		if (host == EM_AARCH64 && target == EM_ARM)			return true;		if (host == EM_PPC64 && target == EM_PPC)			return true;		if (host == EM_SPARCV9 && target == EM_SPARC)			return true;		return false;	} 	/* target == host case */	if (target == EM_RISCV) {		bool target_is_64 = perf_env__kernel_is_64_bit(env);		bool host_is_64 = (sizeof(void *) == 8); 		/* 32-bit host cannot natively disassemble 64-bit target */		if (!host_is_64 && target_is_64)			return false;	} 	return true;} static int perf_env__lookup_binutils_path(struct perf_env *env,					  const char *name, char **path){	int idx;	uint16_t e_machine = perf_env__e_machine(env, /*e_flags=*/NULL);	const char *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 (is_native_compatible(env, e_machine, EM_HOST))		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);	} 	switch (e_machine) {	case EM_ARC:		path_list = arc_triplets;		break;	case EM_ARM:		path_list = arm_triplets;		break;	case EM_AARCH64:		path_list = arm64_triplets;		break;	case EM_PPC:	case EM_PPC64:		path_list = powerpc_triplets;		break;	case EM_RISCV:		path_list = perf_env__kernel_is_64_bit(env) ? riscv64_triplets : riscv32_triplets;		break;	case EM_SH:		path_list = sh_triplets;		break;	case EM_S390:		path_list = s390_triplets;		break;	case EM_SPARC:	case EM_SPARCV9:		path_list = sparc_triplets;		break;	case EM_X86_64:	case EM_386:		path_list = x86_triplets;		break;	case EM_MIPS:		path_list = mips_triplets;		break;	default:		ui__error("binutils for %s not supported.\n", perf_env__arch(env));		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, perf_env__arch(env), 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, 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){	uint16_t e_machine = perf_env__e_machine(env, /*e_flags=*/NULL); 	return e_machine != EM_SPARC && e_machine != EM_SPARCV9 && e_machine != EM_S390;}