// SPDX-License-Identifier: GPL-2.0#include "symbol.h"#include <assert.h>#include <errno.h>#include <inttypes.h>#include <limits.h>#include <stdlib.h>#include <string.h>#include <stdio.h>#include <unistd.h>#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */#include "dso.h"#include "map.h"#include "map_symbol.h"#include "thread.h"#include "vdso.h"#include "build-id.h"#include "debug.h"#include "machine.h"#include <linux/string.h>#include <linux/zalloc.h>#include "srcline.h"#include "namespaces.h"#include "unwind.h"#include "srccode.h"#include "ui/ui.h" static void __maps__insert(struct maps *maps, struct map *map); static inline int is_anon_memory(const char *filename, u32 flags){	return flags & MAP_HUGETLB ||	       !strcmp(filename, "//anon") ||	       !strncmp(filename, "/dev/zero", sizeof("/dev/zero") - 1) ||	       !strncmp(filename, "/anon_hugepage", sizeof("/anon_hugepage") - 1);} static inline int is_no_dso_memory(const char *filename){	return !strncmp(filename, "[stack", 6) ||	       !strncmp(filename, "/SYSV",5)   ||	       !strcmp(filename, "[heap]");} 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;		size_t ndk_length;		size_t 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, app, arch, libname); 		return true;	}	return false;} void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso){	map->start    = start;	map->end      = end;	map->pgoff    = pgoff;	map->reloc    = 0;	map->dso      = dso__get(dso);	map->map_ip   = map__map_ip;	map->unmap_ip = map__unmap_ip;	RB_CLEAR_NODE(&map->rb_node);	map->erange_warned = false;	refcount_set(&map->refcnt, 1);} struct map *map__new(struct machine *machine, u64 start, u64 len,		     u64 pgoff, struct dso_id *id,		     u32 prot, u32 flags, char *filename,		     struct thread *thread){	struct map *map = malloc(sizeof(*map));	struct nsinfo *nsi = NULL;	struct nsinfo *nnsi; 	if (map != NULL) {		char newfilename[PATH_MAX];		struct dso *dso;		int anon, no_dso, vdso, android; 		android = is_android_lib(filename);		anon = is_anon_memory(filename, flags);		vdso = is_vdso_map(filename);		no_dso = is_no_dso_memory(filename);		map->prot = prot;		map->flags = flags;		nsi = nsinfo__get(thread->nsinfo); 		if ((anon || no_dso) && nsi && (prot & PROT_EXEC)) {			snprintf(newfilename, sizeof(newfilename),				 "/tmp/perf-%d.map", nsi->pid);			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);				nnsi->need_setns = false;				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; 		map__init(map, start, start + len, pgoff, dso); 		if (anon || no_dso) {			map->map_ip = map->unmap_ip = identity__map_ip; 			/*			 * 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);		}		dso->nsinfo = nsi;		dso__put(dso);	}	return map;out_delete:	nsinfo__put(nsi);	free(map);	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 *map = calloc(1, (sizeof(*map) +				     (dso->kernel ? sizeof(struct kmap) : 0)));	if (map != NULL) {		/*		 * ->end will be filled after we load all the symbols		 */		map__init(map, start, 0, 0, dso);	} 	return map;} bool __map__is_kernel(const struct map *map){	if (!map->dso->kernel)		return false;	return machine__kernel_map(map__kmaps((struct map *)map)->machine) == 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; 	if (map->dso->binary_type == 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 = map->dso->short_name;	return name && (strstr(name, "bpf_prog_") == name);} bool __map__is_ool(const struct map *map){	return map->dso && map->dso->binary_type == DSO_BINARY_TYPE__OOL;} bool map__has_symbols(const struct map *map){	return dso__has_symbols(map->dso);} static void map__exit(struct map *map){	BUG_ON(refcount_read(&map->refcnt) != 0);	dso__zput(map->dso);} void map__delete(struct map *map){	map__exit(map);	free(map);} void map__put(struct map *map){	if (map && refcount_dec_and_test(&map->refcnt))		map__delete(map);} void map__fixup_start(struct map *map){	struct rb_root_cached *symbols = &map->dso->symbols;	struct rb_node *nd = rb_first_cached(symbols);	if (nd != NULL) {		struct symbol *sym = rb_entry(nd, struct symbol, rb_node);		map->start = sym->start;	}} void map__fixup_end(struct map *map){	struct rb_root_cached *symbols = &map->dso->symbols;	struct rb_node *nd = rb_last(&symbols->rb_root);	if (nd != NULL) {		struct symbol *sym = rb_entry(nd, struct symbol, rb_node);		map->end = sym->end;	}} #define DSO__DELETED "(deleted)" int map__load(struct map *map){	const char *name = map->dso->long_name;	int nr; 	if (dso__loaded(map->dso))		return 0; 	nr = dso__load(map->dso, map);	if (nr < 0) {		if (map->dso->has_build_id) {			char sbuild_id[SBUILD_ID_SIZE]; 			build_id__sprintf(map->dso->build_id,					  sizeof(map->dso->build_id),					  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, addr);} struct symbol *map__find_symbol_by_name(struct map *map, const char *name){	if (map__load(map) < 0)		return NULL; 	if (!dso__sorted_by_name(map->dso))		dso__sort_by_name(map->dso); 	return dso__find_symbol_by_name(map->dso, name);} struct map *map__clone(struct map *from){	size_t size = sizeof(struct map);	struct map *map; 	if (from->dso && from->dso->kernel)		size += sizeof(struct kmap); 	map = memdup(from, size);	if (map != NULL) {		refcount_set(&map->refcnt, 1);		RB_CLEAR_NODE(&map->rb_node);		dso__get(map->dso);	} 	return map;} size_t map__fprintf(struct map *map, FILE *fp){	return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",		       map->start, map->end, map->pgoff, map->dso->name);} size_t map__fprintf_dsoname(struct map *map, FILE *fp){	char buf[symbol_conf.pad_output_len_dso + 1];	const char *dsoname = "[unknown]"; 	if (map && map->dso) {		if (symbol_conf.show_kernel_path && map->dso->long_name)			dsoname = map->dso->long_name;		else			dsoname = map->dso->name;	} 	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);} char *map__srcline(struct map *map, u64 addr, struct symbol *sym){	if (map == NULL)		return SRCLINE_UNKNOWN;	return get_srcline(map->dso, map__rip_2objdump(map, addr), sym, true, true, addr);} int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,			 FILE *fp){	int ret = 0; 	if (map && map->dso) {		char *srcline = map__srcline(map, addr, NULL);		if (strncmp(srcline, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)			ret = fprintf(fp, "%s%s", prefix, srcline);		free_srcline(srcline);	}	return ret;} void srccode_state_free(struct srccode_state *state){	zfree(&state->srcfile);	state->line = 0;} /** * map__rip_2objdump - convert symbol start address to objdump address. * @map: memory map * @rip: symbol start address * * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN. * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is * relative to section start. * * Return: Address suitable for passing to "objdump --start-address=" */u64 map__rip_2objdump(struct map *map, u64 rip){	struct kmap *kmap = __map__kmap(map); 	/*	 * vmlinux does not have program headers for PTI entry trampolines and	 * kcore may not either. However the trampoline object code is on the	 * main kernel map, so just use that instead.	 */	if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps && kmap->kmaps->machine) {		struct map *kernel_map = machine__kernel_map(kmap->kmaps->machine); 		if (kernel_map)			map = kernel_map;	} 	if (!map->dso->adjust_symbols)		return rip; 	if (map->dso->rel)		return rip - map->pgoff; 	/*	 * kernel modules also have DSO_TYPE_USER in dso->kernel,	 * but all kernel modules are ET_REL, so won't get here.	 */	if (map->dso->kernel == DSO_SPACE__USER)		return rip + map->dso->text_offset; 	return map->unmap_ip(map, rip) - map->reloc;} /** * map__objdump_2mem - convert objdump address to a memory address. * @map: memory map * @ip: objdump address * * Closely related to map__rip_2objdump(), this function takes an address from

Lines 1–500 of 958. Load more