linux/tools/perf/util/map.c

1015 lines
22 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include "symbol.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 "map.h"
#include "thread.h"
#include "vdso.h"
#include "build-id.h"
#include "util.h"
#include "debug.h"
#include "machine.h"
#include <linux/string.h>
#include "srcline.h"
#include "namespaces.h"
#include "unwind.h"
#include "srccode.h"
static void __maps__insert(struct maps *maps, struct map *map);
static void __maps__insert_name(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 !strncmp(filename, "/data/app-lib", 13) ||
!strncmp(filename, "/system/lib", 11);
}
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 (!strncmp(filename, "/data/app-lib", 13)) {
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 (!strncmp(filename, "/system/lib/", 11)) {
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->groups = NULL;
map->erange_warned = false;
refcount_set(&map->refcnt, 1);
}
struct map *map__new(struct machine *machine, u64 start, u64 len,
u64 pgoff, u32 d_maj, u32 d_min, u64 ino,
u64 ino_gen, 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->maj = d_maj;
map->min = d_min;
map->ino = ino;
map->ino_generation = ino_gen;
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(machine, filename);
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;
}
/*
* Use this and __map__is_kmodule() for map instances that are in
* machine->kmaps, and thus have map->groups->machine all properly set, to
* disambiguate between the kernel and modules.
*
* When the need arises, introduce map__is_{kernel,kmodule)() that
* checks (map->groups != NULL && map->groups->machine != NULL &&
* map->dso->kernel) before calling __map__is_{kernel,kmodule}())
*/
bool __map__is_kernel(const struct map *map)
{
return machine__kernel_map(map->groups->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__has_symbols(const struct map *map)
{
return dso__has_symbols(map->dso);
}
static void map__exit(struct map *map)
{
BUG_ON(!RB_EMPTY_NODE(&map->rb_node));
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)
{
struct map *map = memdup(from, sizeof(*map));
if (map != NULL) {
refcount_set(&map->refcnt, 1);
RB_CLEAR_NODE(&map->rb_node);
dso__get(map->dso);
map->groups = NULL;
}
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)
{
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;
}
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 (srcline != SRCLINE_UNKNOWN)
ret = fprintf(fp, "%s%s", prefix, srcline);
free_srcline(srcline);
}
return ret;
}
int map__fprintf_srccode(struct map *map, u64 addr,
FILE *fp,
struct srccode_state *state)
{
char *srcfile;
int ret = 0;
unsigned line;
int len;
char *srccode;
if (!map || !map->dso)
return 0;
srcfile = get_srcline_split(map->dso,
map__rip_2objdump(map, addr),
&line);
if (!srcfile)
return 0;
/* Avoid redundant printing */
if (state &&
state->srcfile &&
!strcmp(state->srcfile, srcfile) &&
state->line == line) {
free(srcfile);
return 0;
}
srccode = find_sourceline(srcfile, line, &len);
if (!srccode)
goto out_free_line;
ret = fprintf(fp, "|%-8d %.*s", line, len, srccode);
state->srcfile = srcfile;
state->line = line;
return ret;
out_free_line:
free(srcfile);
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_TYPE_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
* 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)
{
if (!map->dso->adjust_symbols)
return map->unmap_ip(map, ip);
if (map->dso->rel)
return map->unmap_ip(map, ip + 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_TYPE_USER)
return map->unmap_ip(map, ip - map->dso->text_offset);
return ip + map->reloc;
}
static void maps__init(struct maps *maps)
{
maps->entries = RB_ROOT;
maps->names = RB_ROOT;
init_rwsem(&maps->lock);
}
void map_groups__init(struct map_groups *mg, struct machine *machine)
{
maps__init(&mg->maps);
mg->machine = machine;
refcount_set(&mg->refcnt, 1);
}
void map_groups__insert(struct map_groups *mg, struct map *map)
{
maps__insert(&mg->maps, map);
map->groups = mg;
}
static void __maps__purge(struct maps *maps)
{
struct rb_root *root = &maps->entries;
struct rb_node *next = rb_first(root);
while (next) {
struct map *pos = rb_entry(next, struct map, rb_node);
next = rb_next(&pos->rb_node);
rb_erase_init(&pos->rb_node, root);
map__put(pos);
}
}
static void __maps__purge_names(struct maps *maps)
{
struct rb_root *root = &maps->names;
struct rb_node *next = rb_first(root);
while (next) {
struct map *pos = rb_entry(next, struct map, rb_node_name);
next = rb_next(&pos->rb_node_name);
rb_erase_init(&pos->rb_node_name, root);
map__put(pos);
}
}
static void maps__exit(struct maps *maps)
{
down_write(&maps->lock);
__maps__purge(maps);
__maps__purge_names(maps);
up_write(&maps->lock);
}
void map_groups__exit(struct map_groups *mg)
{
maps__exit(&mg->maps);
}
bool map_groups__empty(struct map_groups *mg)
{
return !maps__first(&mg->maps);
}
struct map_groups *map_groups__new(struct machine *machine)
{
struct map_groups *mg = malloc(sizeof(*mg));
if (mg != NULL)
map_groups__init(mg, machine);
return mg;
}
void map_groups__delete(struct map_groups *mg)
{
map_groups__exit(mg);
free(mg);
}
void map_groups__put(struct map_groups *mg)
{
if (mg && refcount_dec_and_test(&mg->refcnt))
map_groups__delete(mg);
}
struct symbol *map_groups__find_symbol(struct map_groups *mg,
u64 addr, struct map **mapp)
{
struct map *map = map_groups__find(mg, addr);
/* Ensure map is loaded before using map->map_ip */
if (map != NULL && map__load(map) >= 0) {
if (mapp != NULL)
*mapp = map;
return map__find_symbol(map, map->map_ip(map, addr));
}
return NULL;
}
static bool map__contains_symbol(struct map *map, struct symbol *sym)
{
u64 ip = map->unmap_ip(map, sym->start);
return ip >= map->start && ip < map->end;
}
struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name,
struct map **mapp)
{
struct symbol *sym;
struct rb_node *nd;
down_read(&maps->lock);
for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
struct map *pos = rb_entry(nd, struct map, rb_node);
sym = map__find_symbol_by_name(pos, name);
if (sym == NULL)
continue;
if (!map__contains_symbol(pos, sym)) {
sym = NULL;
continue;
}
if (mapp != NULL)
*mapp = pos;
goto out;
}
sym = NULL;
out:
up_read(&maps->lock);
return sym;
}
struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg,
const char *name,
struct map **mapp)
{
return maps__find_symbol_by_name(&mg->maps, name, mapp);
}
int map_groups__find_ams(struct addr_map_symbol *ams)
{
if (ams->addr < ams->map->start || ams->addr >= ams->map->end) {
if (ams->map->groups == NULL)
return -1;
ams->map = map_groups__find(ams->map->groups, ams->addr);
if (ams->map == NULL)
return -1;
}
ams->al_addr = ams->map->map_ip(ams->map, ams->addr);
ams->sym = map__find_symbol(ams->map, ams->al_addr);
return ams->sym ? 0 : -1;
}
static size_t maps__fprintf(struct maps *maps, FILE *fp)
{
size_t printed = 0;
struct rb_node *nd;
down_read(&maps->lock);
for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) {
struct map *pos = rb_entry(nd, struct map, rb_node);
printed += fprintf(fp, "Map:");
printed += map__fprintf(pos, fp);
if (verbose > 2) {
printed += dso__fprintf(pos->dso, fp);
printed += fprintf(fp, "--\n");
}
}
up_read(&maps->lock);
return printed;
}
size_t map_groups__fprintf(struct map_groups *mg, FILE *fp)
{
return maps__fprintf(&mg->maps, fp);
}
static void __map_groups__insert(struct map_groups *mg, struct map *map)
{
__maps__insert(&mg->maps, map);
__maps__insert_name(&mg->maps, map);
map->groups = mg;
}
static int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
{
struct rb_root *root;
struct rb_node *next, *first;
int err = 0;
down_write(&maps->lock);
root = &maps->entries;
/*
* Find first map where end > map->start.
* Same as find_vma() in kernel.
*/
next = root->rb_node;
first = NULL;
while (next) {
struct map *pos = rb_entry(next, struct map, rb_node);
if (pos->end > map->start) {
first = next;
if (pos->start <= map->start)
break;
next = next->rb_left;
} else
next = next->rb_right;
}
next = first;
while (next) {
struct map *pos = rb_entry(next, struct map, rb_node);
next = rb_next(&pos->rb_node);
/*
* Stop if current map starts after map->end.
* Maps are ordered by start: next will not overlap for sure.
*/
if (pos->start >= map->end)
break;
if (verbose >= 2) {
if (use_browser) {
pr_debug("overlapping maps in %s (disable tui for more info)\n",
map->dso->name);
} else {
fputs("overlapping maps:\n", fp);
map__fprintf(map, fp);
map__fprintf(pos, fp);
}
}
rb_erase_init(&pos->rb_node, root);
/*
* Now check if we need to create new maps for areas not
* overlapped by the new map:
*/
if (map->start > pos->start) {
struct map *before = map__clone(pos);
if (before == NULL) {
err = -ENOMEM;
goto put_map;
}
before->end = map->start;
__map_groups__insert(pos->groups, before);
if (verbose >= 2 && !use_browser)
map__fprintf(before, fp);
map__put(before);
}
if (map->end < pos->end) {
struct map *after = map__clone(pos);
if (after == NULL) {
err = -ENOMEM;
goto put_map;
}
after->start = map->end;
__map_groups__insert(pos->groups, after);
if (verbose >= 2 && !use_browser)
map__fprintf(after, fp);
map__put(after);
}
put_map:
map__put(pos);
if (err)
goto out;
}
err = 0;
out:
up_write(&maps->lock);
return err;
}
int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map,
FILE *fp)
{
return maps__fixup_overlappings(&mg->maps, map, fp);
}
/*
* XXX This should not really _copy_ te maps, but refcount them.
*/
int map_groups__clone(struct thread *thread, struct map_groups *parent)
{
struct map_groups *mg = thread->mg;
int err = -ENOMEM;
struct map *map;
struct maps *maps = &parent->maps;
down_read(&maps->lock);
for (map = maps__first(maps); map; map = map__next(map)) {
struct map *new = map__clone(map);
if (new == NULL)
goto out_unlock;
err = unwind__prepare_access(thread, new, NULL);
if (err)
goto out_unlock;
map_groups__insert(mg, new);
map__put(new);
}
err = 0;
out_unlock:
up_read(&maps->lock);
return err;
}
static void __maps__insert(struct maps *maps, struct map *map)
{
struct rb_node **p = &maps->entries.rb_node;
struct rb_node *parent = NULL;
const u64 ip = map->start;
struct map *m;
while (*p != NULL) {
parent = *p;
m = rb_entry(parent, struct map, rb_node);
if (ip < m->start)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&map->rb_node, parent, p);
rb_insert_color(&map->rb_node, &maps->entries);
map__get(map);
}
static void __maps__insert_name(struct maps *maps, struct map *map)
{
struct rb_node **p = &maps->names.rb_node;
struct rb_node *parent = NULL;
struct map *m;
int rc;
while (*p != NULL) {
parent = *p;
m = rb_entry(parent, struct map, rb_node_name);
rc = strcmp(m->dso->short_name, map->dso->short_name);
if (rc < 0)
p = &(*p)->rb_left;
else if (rc > 0)
p = &(*p)->rb_right;
else
return;
}
rb_link_node(&map->rb_node_name, parent, p);
rb_insert_color(&map->rb_node_name, &maps->names);
map__get(map);
}
void maps__insert(struct maps *maps, struct map *map)
{
down_write(&maps->lock);
__maps__insert(maps, map);
__maps__insert_name(maps, map);
up_write(&maps->lock);
}
static void __maps__remove(struct maps *maps, struct map *map)
{
rb_erase_init(&map->rb_node, &maps->entries);
map__put(map);
rb_erase_init(&map->rb_node_name, &maps->names);
map__put(map);
}
void maps__remove(struct maps *maps, struct map *map)
{
down_write(&maps->lock);
__maps__remove(maps, map);
up_write(&maps->lock);
}
struct map *maps__find(struct maps *maps, u64 ip)
{
struct rb_node *p;
struct map *m;
down_read(&maps->lock);
p = maps->entries.rb_node;
while (p != NULL) {
m = rb_entry(p, struct map, rb_node);
if (ip < m->start)
p = p->rb_left;
else if (ip >= m->end)
p = p->rb_right;
else
goto out;
}
m = NULL;
out:
up_read(&maps->lock);
return m;
}
struct map *maps__first(struct maps *maps)
{
struct rb_node *first = rb_first(&maps->entries);
if (first)
return rb_entry(first, struct map, rb_node);
return NULL;
}
struct map *map__next(struct map *map)
{
struct rb_node *next = rb_next(&map->rb_node);
if (next)
return rb_entry(next, struct map, rb_node);
return NULL;
}
struct kmap *__map__kmap(struct map *map)
{
if (!map->dso || !map->dso->kernel)
return NULL;
return (struct kmap *)(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 map_groups *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;
}