// SPDX-License-Identifier: GPL-2.0#include <inttypes.h>#include <limits.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <linux/string.h>#include <linux/zalloc.h>#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */#include "debug.h"#include "dso.h"#include "map.h"#include "namespaces.h"#include "srcline.h"#include "symbol.h"#include "thread.h"#include "vdso.h" static inline int is_android_lib(const char *filename){	return strstarts(filename, "/data/app-lib/") ||	       strstarts(filename, "/system/lib/");} static inline bool replace_android_lib(const char *filename, char *newfilename){	const char *libname;	char *app_abi;	size_t app_abi_length, new_length;	size_t lib_length = 0; 	libname  = strrchr(filename, '/');	if (libname)		lib_length = strlen(libname); 	app_abi = getenv("APP_ABI");	if (!app_abi)		return false; 	app_abi_length = strlen(app_abi); 	if (strstarts(filename, "/data/app-lib/")) {		char *apk_path; 		if (!app_abi_length)			return false; 		new_length = 7 + app_abi_length + lib_length; 		apk_path = getenv("APK_PATH");		if (apk_path) {			new_length += strlen(apk_path) + 1;			if (new_length > PATH_MAX)				return false;			snprintf(newfilename, new_length,				 "%s/libs/%s/%s", apk_path, app_abi, libname);		} else {			if (new_length > PATH_MAX)				return false;			snprintf(newfilename, new_length,				 "libs/%s/%s", app_abi, libname);		}		return true;	} 	if (strstarts(filename, "/system/lib/")) {		char *ndk, *app;		const char *arch;		int ndk_length, app_length; 		ndk = getenv("NDK_ROOT");		app = getenv("APP_PLATFORM"); 		if (!(ndk && app))			return false; 		ndk_length = strlen(ndk);		app_length = strlen(app); 		if (!(ndk_length && app_length && app_abi_length))			return false; 		arch = !strncmp(app_abi, "arm", 3) ? "arm" :		       !strncmp(app_abi, "mips", 4) ? "mips" :		       !strncmp(app_abi, "x86", 3) ? "x86" : NULL; 		if (!arch)			return false; 		new_length = 27 + ndk_length +			     app_length + lib_length			   + strlen(arch); 		if (new_length > PATH_MAX)			return false;		snprintf(newfilename, new_length,			"%.*s/platforms/%.*s/arch-%s/usr/lib/%s",			ndk_length, ndk, app_length, app, arch, libname); 		return true;	}	return false;} static void map__init(struct map *map, u64 start, u64 end, u64 pgoff,		      struct dso *dso, u32 prot, u32 flags){	map__set_start(map, start);	map__set_end(map, end);	map__set_pgoff(map, pgoff);	assert(map__reloc(map) == 0);	map__set_dso(map, dso__get(dso));	refcount_set(map__refcnt(map), 1);	RC_CHK_ACCESS(map)->prot = prot;	RC_CHK_ACCESS(map)->flags = flags;	map__set_mapping_type(map, MAPPING_TYPE__DSO);	assert(map__erange_warned(map) == false);	assert(map__priv(map) == false);	assert(map__hit(map) == false);} struct map *map__new(struct machine *machine, u64 start, u64 len,		     u64 pgoff, struct dso_id *id,		     u32 prot, u32 flags, struct build_id *bid,		     char *filename, struct thread *thread){	struct map *result;	RC_STRUCT(map) *map;	struct nsinfo *nsi = NULL;	struct nsinfo *nnsi; 	map = zalloc(sizeof(*map));	if (ADD_RC_CHK(result, map)) {		char newfilename[PATH_MAX];		struct dso *dso, *header_bid_dso;		int anon, no_dso, vdso, android; 		android = is_android_lib(filename);		anon = is_anon_memory(filename) || flags & MAP_HUGETLB;		vdso = is_vdso_map(filename);		no_dso = is_no_dso_memory(filename);		nsi = nsinfo__get(thread__nsinfo(thread)); 		if ((anon || no_dso) && nsi && (prot & PROT_EXEC)) {			snprintf(newfilename, sizeof(newfilename),				 "/tmp/perf-%d.map", nsinfo__pid(nsi));			filename = newfilename;		} 		if (android) {			if (replace_android_lib(filename, newfilename))				filename = newfilename;		} 		if (vdso) {			/* The vdso maps are always on the host and not the			 * container.  Ensure that we don't use setns to look			 * them up.			 */			nnsi = nsinfo__copy(nsi);			if (nnsi) {				nsinfo__put(nsi);				nsinfo__clear_need_setns(nnsi);				nsi = nnsi;			}			pgoff = 0;			dso = machine__findnew_vdso(machine, thread);		} else			dso = machine__findnew_dso_id(machine, filename, id); 		if (dso == NULL)			goto out_delete; 		assert(!dso__kernel(dso));		map__init(result, start, start + len, pgoff, dso, prot, flags); 		if (anon || no_dso) {			map->mapping_type = MAPPING_TYPE__IDENTITY; 			/*			 * Set memory without DSO as loaded. All map__find_*			 * functions still return NULL, and we avoid the			 * unnecessary map__load warning.			 */			if (!(prot & PROT_EXEC))				dso__set_loaded(dso);		}		mutex_lock(dso__lock(dso));		dso__set_nsinfo(dso, nsi);		mutex_unlock(dso__lock(dso)); 		if (build_id__is_defined(bid)) {			dso__set_build_id(dso, bid);		} else {			/*			 * If the mmap event had no build ID, search for an existing dso from the			 * build ID header by name. Otherwise only the dso loaded at the time of			 * reading the header will have the build ID set and all future mmaps will			 * have it missing.			 */			header_bid_dso = dsos__find(&machine->dsos, filename, false);			if (header_bid_dso && dso__header_build_id(header_bid_dso)) {				dso__set_build_id(dso, dso__bid(header_bid_dso));				dso__set_header_build_id(dso, 1);			}			dso__put(header_bid_dso);		}		dso__put(dso);	}	return result;out_delete:	nsinfo__put(nsi);	RC_CHK_FREE(result);	return NULL;} /* * Constructor variant for modules (where we know from /proc/modules where * they are loaded) and for vmlinux, where only after we load all the * symbols we'll know where it starts and ends. */struct map *map__new2(u64 start, struct dso *dso){	struct map *result;	RC_STRUCT(map) *map; 	map = calloc(1, sizeof(*map) + (dso__kernel(dso) ? sizeof(struct kmap) : 0));	if (ADD_RC_CHK(result, map)) {		/* ->end will be filled after we load all the symbols. */		map__init(result, start, /*end=*/0, /*pgoff=*/0, dso, /*prot=*/0, /*flags=*/0);	} 	return result;} bool __map__is_kernel(const struct map *map){	if (!dso__kernel(map__dso(map)))		return false;	return machine__kernel_map(maps__machine(map__kmaps((struct map *)map))) == map;} bool __map__is_extra_kernel_map(const struct map *map){	struct kmap *kmap = __map__kmap((struct map *)map); 	return kmap && kmap->name[0];} bool __map__is_bpf_prog(const struct map *map){	const char *name;	struct dso *dso = map__dso(map); 	if (dso__binary_type(dso) == DSO_BINARY_TYPE__BPF_PROG_INFO)		return true; 	/*	 * If PERF_RECORD_BPF_EVENT is not included, the dso will not have	 * type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can	 * guess the type based on name.	 */	name = dso__short_name(dso);	return name && (strstr(name, "bpf_prog_") == name);} bool __map__is_bpf_image(const struct map *map){	const char *name;	struct dso *dso = map__dso(map); 	if (dso__binary_type(dso) == DSO_BINARY_TYPE__BPF_IMAGE)		return true; 	/*	 * If PERF_RECORD_KSYMBOL is not included, the dso will not have	 * type of DSO_BINARY_TYPE__BPF_IMAGE. In such cases, we can	 * guess the type based on name.	 */	name = dso__short_name(dso);	return name && is_bpf_image(name);} bool __map__is_ool(const struct map *map){	const struct dso *dso = map__dso(map); 	return dso && dso__binary_type(dso) == DSO_BINARY_TYPE__OOL;} bool map__has_symbols(const struct map *map){	return dso__has_symbols(map__dso(map));} static void map__exit(struct map *map){	BUG_ON(refcount_read(map__refcnt(map)) != 0);	dso__zput(RC_CHK_ACCESS(map)->dso);} void map__delete(struct map *map){	map__exit(map);	RC_CHK_FREE(map);} void map__put(struct map *map){	if (map && refcount_dec_and_test(map__refcnt(map)))		map__delete(map);	else		RC_CHK_PUT(map);} void map__fixup_start(struct map *map){	struct dso *dso = map__dso(map);	struct rb_root_cached *symbols = dso__symbols(dso);	struct rb_node *nd = rb_first_cached(symbols); 	if (nd != NULL) {		struct symbol *sym = rb_entry(nd, struct symbol, rb_node); 		map__set_start(map, sym->start);	}} void map__fixup_end(struct map *map){	struct dso *dso = map__dso(map);	struct rb_root_cached *symbols = dso__symbols(dso);	struct rb_node *nd = rb_last(&symbols->rb_root); 	if (nd != NULL) {		struct symbol *sym = rb_entry(nd, struct symbol, rb_node);		map__set_end(map, sym->end);	}} #define DSO__DELETED "(deleted)" int map__load(struct map *map){	struct dso *dso = map__dso(map);	const char *name = dso__long_name(dso);	int nr; 	if (dso__loaded(dso))		return 0; 	nr = dso__load(dso, map);	if (nr < 0) {		if (dso__has_build_id(dso)) {			char sbuild_id[SBUILD_ID_SIZE]; 			build_id__sprintf(dso__bid(dso), sbuild_id);			pr_debug("%s with build id %s not found", name, sbuild_id);		} else			pr_debug("Failed to open %s", name); 		pr_debug(", continuing without symbols\n");		return -1;	} else if (nr == 0) {#ifdef HAVE_LIBELF_SUPPORT		const size_t len = strlen(name);		const size_t real_len = len - sizeof(DSO__DELETED); 		if (len > sizeof(DSO__DELETED) &&		    strcmp(name + real_len + 1, DSO__DELETED) == 0) {			pr_debug("%.*s was updated (is prelink enabled?). "				"Restart the long running apps that use it!\n",				   (int)real_len, name);		} else {			pr_debug("no symbols found in %s, maybe install a debug package?\n", name);		}#endif		return -1;	} 	return 0;} struct symbol *map__find_symbol(struct map *map, u64 addr){	if (map__load(map) < 0)		return NULL; 	return dso__find_symbol(map__dso(map), addr);} struct symbol *map__find_symbol_by_name_idx(struct map *map, const char *name, size_t *idx){	struct dso *dso; 	if (map__load(map) < 0)		return NULL; 	dso = map__dso(map);	dso__sort_by_name(dso); 	return dso__find_symbol_by_name(dso, name, idx);} struct symbol *map__find_symbol_by_name(struct map *map, const char *name){	size_t idx; 	return map__find_symbol_by_name_idx(map, name, &idx);} struct map *map__clone(struct map *from){	struct map *result;	RC_STRUCT(map) *map;	size_t size = sizeof(RC_STRUCT(map));	struct dso *dso = map__dso(from); 	if (dso && dso__kernel(dso))		size += sizeof(struct kmap); 	map = memdup(RC_CHK_ACCESS(from), size);	if (ADD_RC_CHK(result, map)) {		refcount_set(&map->refcnt, 1);		map->dso = dso__get(dso);	} 	return result;} size_t map__fprintf(struct map *map, FILE *fp){	const struct dso *dso = map__dso(map); 	return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",		       map__start(map), map__end(map), map__pgoff(map), dso__name(dso));} static bool prefer_dso_long_name(const struct dso *dso, bool print_off){	return dso__long_name(dso) &&	       (symbol_conf.show_kernel_path ||		(print_off && (dso__name(dso)[0] == '[' || dso__is_kcore(dso))));} static size_t __map__fprintf_dsoname(struct map *map, bool print_off, FILE *fp){	char buf[symbol_conf.pad_output_len_dso + 1];	const char *dsoname = "[unknown]";	const struct dso *dso = map ? map__dso(map) : NULL; 	if (dso) {		if (prefer_dso_long_name(dso, print_off))			dsoname = dso__long_name(dso);		else			dsoname = dso__name(dso);	} 	if (symbol_conf.pad_output_len_dso) {		scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname);		dsoname = buf;	} 	return fprintf(fp, "%s", dsoname);} size_t map__fprintf_dsoname(struct map *map, FILE *fp){	return __map__fprintf_dsoname(map, false, fp);} size_t map__fprintf_dsoname_dsoff(struct map *map, bool print_off, u64 addr, FILE *fp){	const struct dso *dso = map ? map__dso(map) : NULL;	int printed = 0; 	if (print_off && (!dso || !dso__is_object_file(dso)))		print_off = false;	printed += fprintf(fp, " (");	printed += __map__fprintf_dsoname(map, print_off, fp);	if (print_off)		printed += fprintf(fp, "+0x%" PRIx64, addr);	printed += fprintf(fp, ")"); 	return printed;} char *map__srcline(struct map *map, u64 addr, struct symbol *sym){	if (map == NULL)		return SRCLINE_UNKNOWN; 	return get_srcline(map__dso(map), map__rip_2objdump(map, addr), sym, true, true, addr);} int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,			 FILE *fp){	const struct dso *dso = map ? map__dso(map) : NULL;	int ret = 0;

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