// 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;
if (dso) {
char *srcline = map__srcline(map, addr, NULL);
if (srcline != SRCLINE_UNKNOWN)
ret = fprintf(fp, "%s%s", prefix, srcline);
zfree_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);
const struct dso *dso = map__dso(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) {
struct machine *machine = maps__machine(kmap->kmaps);
if (machine) {
struct map *kernel_map = machine__kernel_map(machine);
if (kernel_map)
map = kernel_map;
}
}
if (!dso__adjust_symbols(dso))
return rip;
if (dso__rel(dso))
return rip - map__pgoff(map);
if (dso__kernel(dso) == DSO_SPACE__USER)
return rip + dso__text_offset(dso);
return map__unmap_ip(map, rip) - map__reloc(map);
}
/**
* 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
* objdump and converts it to a memory address. Note this assumes that @map
* contains the address. To be sure the result is valid, check it forwards
* e.g. map__rip_2objdump(map__map_ip(map, map__objdump_2mem(map, ip))) == ip
*
* Return: Memory address.
*/
u64 map__objdump_2mem(struct map *map, u64 ip)
{
const struct dso *dso = map__dso(map);
if (!dso__adjust_symbols(dso))
return map__unmap_ip(map, ip);
if (dso__rel(dso))
return map__unmap_ip(map, ip + map__pgoff(map));
if (dso__kernel(dso) == DSO_SPACE__USER)
return map__unmap_ip(map, ip - dso__text_offset(dso));
return ip + map__reloc(map);
}
/* convert objdump address to relative address. (To be removed) */
u64 map__objdump_2rip(struct map *map, u64 ip)
{
const struct dso *dso = map__dso(map);
if (!dso__adjust_symbols(dso))
return ip;
if (dso__rel(dso))
return ip + map__pgoff(map);
if (dso__kernel(dso) == DSO_SPACE__USER)
return ip - dso__text_offset(dso);
return map__map_ip(map, ip + map__reloc(map));
}
bool map__contains_symbol(const struct map *map, const struct symbol *sym)
{
u64 ip = map__unmap_ip(map, sym->start);
return ip >= map__start(map) && ip < map__end(map);
}
struct kmap *__map__kmap(struct map *map)
{
const struct dso *dso = map__dso(map);
if (!dso || !dso__kernel(dso))
return NULL;
return (struct kmap *)(&RC_CHK_ACCESS(map)[1]);
}
struct kmap *map__kmap(struct map *map)
{
struct kmap *kmap = __map__kmap(map);
if (!kmap)
pr_err("Internal error: map__kmap with a non-kernel map\n");
return kmap;
}
struct maps *map__kmaps(struct map *map)
{
struct kmap *kmap = map__kmap(map);
if (!kmap || !kmap->kmaps) {
pr_err("Internal error: map__kmaps with a non-kernel map\n");
return NULL;
}
return kmap->kmaps;
}
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