478 lines
10 KiB
C
478 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <stdlib.h>
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#include <linux/zalloc.h>
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#include "debug.h"
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#include "dso.h"
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#include "map.h"
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#include "maps.h"
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#include "thread.h"
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#include "ui/ui.h"
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#include "unwind.h"
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static void maps__init(struct maps *maps, struct machine *machine)
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{
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refcount_set(maps__refcnt(maps), 1);
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init_rwsem(maps__lock(maps));
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RC_CHK_ACCESS(maps)->entries = RB_ROOT;
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RC_CHK_ACCESS(maps)->machine = machine;
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RC_CHK_ACCESS(maps)->last_search_by_name = NULL;
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RC_CHK_ACCESS(maps)->nr_maps = 0;
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RC_CHK_ACCESS(maps)->maps_by_name = NULL;
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}
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static void __maps__free_maps_by_name(struct maps *maps)
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{
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/*
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* Free everything to try to do it from the rbtree in the next search
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*/
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for (unsigned int i = 0; i < maps__nr_maps(maps); i++)
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map__put(maps__maps_by_name(maps)[i]);
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zfree(&RC_CHK_ACCESS(maps)->maps_by_name);
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RC_CHK_ACCESS(maps)->nr_maps_allocated = 0;
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}
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static int __maps__insert(struct maps *maps, struct map *map)
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{
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struct rb_node **p = &maps__entries(maps)->rb_node;
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struct rb_node *parent = NULL;
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const u64 ip = map__start(map);
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struct map_rb_node *m, *new_rb_node;
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new_rb_node = malloc(sizeof(*new_rb_node));
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if (!new_rb_node)
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return -ENOMEM;
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RB_CLEAR_NODE(&new_rb_node->rb_node);
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new_rb_node->map = map__get(map);
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while (*p != NULL) {
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parent = *p;
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m = rb_entry(parent, struct map_rb_node, rb_node);
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if (ip < map__start(m->map))
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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rb_link_node(&new_rb_node->rb_node, parent, p);
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rb_insert_color(&new_rb_node->rb_node, maps__entries(maps));
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return 0;
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}
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int maps__insert(struct maps *maps, struct map *map)
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{
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int err;
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const struct dso *dso = map__dso(map);
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down_write(maps__lock(maps));
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err = __maps__insert(maps, map);
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if (err)
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goto out;
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++RC_CHK_ACCESS(maps)->nr_maps;
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if (dso && dso->kernel) {
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struct kmap *kmap = map__kmap(map);
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if (kmap)
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kmap->kmaps = maps;
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else
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pr_err("Internal error: kernel dso with non kernel map\n");
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}
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/*
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* If we already performed some search by name, then we need to add the just
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* inserted map and resort.
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*/
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if (maps__maps_by_name(maps)) {
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if (maps__nr_maps(maps) > RC_CHK_ACCESS(maps)->nr_maps_allocated) {
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int nr_allocate = maps__nr_maps(maps) * 2;
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struct map **maps_by_name = realloc(maps__maps_by_name(maps),
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nr_allocate * sizeof(map));
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if (maps_by_name == NULL) {
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__maps__free_maps_by_name(maps);
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err = -ENOMEM;
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goto out;
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}
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RC_CHK_ACCESS(maps)->maps_by_name = maps_by_name;
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RC_CHK_ACCESS(maps)->nr_maps_allocated = nr_allocate;
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}
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maps__maps_by_name(maps)[maps__nr_maps(maps) - 1] = map__get(map);
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__maps__sort_by_name(maps);
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}
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out:
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up_write(maps__lock(maps));
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return err;
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}
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static void __maps__remove(struct maps *maps, struct map_rb_node *rb_node)
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{
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rb_erase_init(&rb_node->rb_node, maps__entries(maps));
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map__put(rb_node->map);
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free(rb_node);
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}
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void maps__remove(struct maps *maps, struct map *map)
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{
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struct map_rb_node *rb_node;
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down_write(maps__lock(maps));
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if (RC_CHK_ACCESS(maps)->last_search_by_name == map)
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RC_CHK_ACCESS(maps)->last_search_by_name = NULL;
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rb_node = maps__find_node(maps, map);
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assert(rb_node->RC_CHK_ACCESS(map) == RC_CHK_ACCESS(map));
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__maps__remove(maps, rb_node);
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if (maps__maps_by_name(maps))
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__maps__free_maps_by_name(maps);
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--RC_CHK_ACCESS(maps)->nr_maps;
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up_write(maps__lock(maps));
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}
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static void __maps__purge(struct maps *maps)
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{
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struct map_rb_node *pos, *next;
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if (maps__maps_by_name(maps))
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__maps__free_maps_by_name(maps);
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maps__for_each_entry_safe(maps, pos, next) {
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rb_erase_init(&pos->rb_node, maps__entries(maps));
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map__put(pos->map);
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free(pos);
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}
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}
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static void maps__exit(struct maps *maps)
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{
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down_write(maps__lock(maps));
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__maps__purge(maps);
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up_write(maps__lock(maps));
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}
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bool maps__empty(struct maps *maps)
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{
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return !maps__first(maps);
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}
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struct maps *maps__new(struct machine *machine)
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{
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struct maps *result;
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RC_STRUCT(maps) *maps = zalloc(sizeof(*maps));
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if (ADD_RC_CHK(result, maps))
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maps__init(result, machine);
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return result;
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}
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static void maps__delete(struct maps *maps)
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{
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maps__exit(maps);
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unwind__finish_access(maps);
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RC_CHK_FREE(maps);
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}
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struct maps *maps__get(struct maps *maps)
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{
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struct maps *result;
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if (RC_CHK_GET(result, maps))
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refcount_inc(maps__refcnt(maps));
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return result;
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}
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void maps__put(struct maps *maps)
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{
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if (maps && refcount_dec_and_test(maps__refcnt(maps)))
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maps__delete(maps);
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else
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RC_CHK_PUT(maps);
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}
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struct symbol *maps__find_symbol(struct maps *maps, u64 addr, struct map **mapp)
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{
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struct map *map = maps__find(maps, addr);
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/* Ensure map is loaded before using map->map_ip */
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if (map != NULL && map__load(map) >= 0) {
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if (mapp != NULL)
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*mapp = map;
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return map__find_symbol(map, map__map_ip(map, addr));
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}
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return NULL;
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}
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struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name, struct map **mapp)
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{
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struct symbol *sym;
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struct map_rb_node *pos;
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down_read(maps__lock(maps));
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maps__for_each_entry(maps, pos) {
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sym = map__find_symbol_by_name(pos->map, name);
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if (sym == NULL)
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continue;
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if (!map__contains_symbol(pos->map, sym)) {
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sym = NULL;
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continue;
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}
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if (mapp != NULL)
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*mapp = pos->map;
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goto out;
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}
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sym = NULL;
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out:
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up_read(maps__lock(maps));
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return sym;
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}
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int maps__find_ams(struct maps *maps, struct addr_map_symbol *ams)
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{
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if (ams->addr < map__start(ams->ms.map) || ams->addr >= map__end(ams->ms.map)) {
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if (maps == NULL)
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return -1;
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ams->ms.map = maps__find(maps, ams->addr);
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if (ams->ms.map == NULL)
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return -1;
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}
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ams->al_addr = map__map_ip(ams->ms.map, ams->addr);
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ams->ms.sym = map__find_symbol(ams->ms.map, ams->al_addr);
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return ams->ms.sym ? 0 : -1;
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}
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size_t maps__fprintf(struct maps *maps, FILE *fp)
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{
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size_t printed = 0;
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struct map_rb_node *pos;
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down_read(maps__lock(maps));
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maps__for_each_entry(maps, pos) {
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printed += fprintf(fp, "Map:");
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printed += map__fprintf(pos->map, fp);
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if (verbose > 2) {
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printed += dso__fprintf(map__dso(pos->map), fp);
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printed += fprintf(fp, "--\n");
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}
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}
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up_read(maps__lock(maps));
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return printed;
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}
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int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
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{
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struct rb_root *root;
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struct rb_node *next, *first;
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int err = 0;
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down_write(maps__lock(maps));
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root = maps__entries(maps);
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/*
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* Find first map where end > map->start.
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* Same as find_vma() in kernel.
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*/
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next = root->rb_node;
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first = NULL;
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while (next) {
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struct map_rb_node *pos = rb_entry(next, struct map_rb_node, rb_node);
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if (map__end(pos->map) > map__start(map)) {
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first = next;
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if (map__start(pos->map) <= map__start(map))
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break;
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next = next->rb_left;
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} else
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next = next->rb_right;
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}
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next = first;
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while (next && !err) {
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struct map_rb_node *pos = rb_entry(next, struct map_rb_node, rb_node);
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next = rb_next(&pos->rb_node);
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/*
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* Stop if current map starts after map->end.
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* Maps are ordered by start: next will not overlap for sure.
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*/
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if (map__start(pos->map) >= map__end(map))
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break;
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if (verbose >= 2) {
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if (use_browser) {
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pr_debug("overlapping maps in %s (disable tui for more info)\n",
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map__dso(map)->name);
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} else {
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fputs("overlapping maps:\n", fp);
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map__fprintf(map, fp);
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map__fprintf(pos->map, fp);
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}
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}
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rb_erase_init(&pos->rb_node, root);
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/*
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* Now check if we need to create new maps for areas not
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* overlapped by the new map:
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*/
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if (map__start(map) > map__start(pos->map)) {
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struct map *before = map__clone(pos->map);
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if (before == NULL) {
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err = -ENOMEM;
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goto put_map;
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}
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map__set_end(before, map__start(map));
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err = __maps__insert(maps, before);
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if (err) {
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map__put(before);
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goto put_map;
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}
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if (verbose >= 2 && !use_browser)
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map__fprintf(before, fp);
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map__put(before);
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}
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if (map__end(map) < map__end(pos->map)) {
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struct map *after = map__clone(pos->map);
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if (after == NULL) {
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err = -ENOMEM;
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goto put_map;
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}
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map__set_start(after, map__end(map));
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map__add_pgoff(after, map__end(map) - map__start(pos->map));
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assert(map__map_ip(pos->map, map__end(map)) ==
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map__map_ip(after, map__end(map)));
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err = __maps__insert(maps, after);
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if (err) {
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map__put(after);
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goto put_map;
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}
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if (verbose >= 2 && !use_browser)
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map__fprintf(after, fp);
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map__put(after);
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}
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put_map:
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map__put(pos->map);
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free(pos);
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}
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up_write(maps__lock(maps));
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return err;
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}
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/*
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* XXX This should not really _copy_ te maps, but refcount them.
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*/
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int maps__clone(struct thread *thread, struct maps *parent)
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{
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struct maps *maps = thread__maps(thread);
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int err;
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struct map_rb_node *rb_node;
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down_read(maps__lock(parent));
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maps__for_each_entry(parent, rb_node) {
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struct map *new = map__clone(rb_node->map);
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if (new == NULL) {
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err = -ENOMEM;
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goto out_unlock;
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}
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err = unwind__prepare_access(maps, new, NULL);
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if (err)
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goto out_unlock;
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err = maps__insert(maps, new);
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if (err)
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goto out_unlock;
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map__put(new);
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}
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err = 0;
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out_unlock:
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up_read(maps__lock(parent));
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return err;
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}
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struct map_rb_node *maps__find_node(struct maps *maps, struct map *map)
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{
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struct map_rb_node *rb_node;
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maps__for_each_entry(maps, rb_node) {
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if (rb_node->RC_CHK_ACCESS(map) == RC_CHK_ACCESS(map))
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return rb_node;
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}
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return NULL;
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}
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struct map *maps__find(struct maps *maps, u64 ip)
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{
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struct rb_node *p;
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struct map_rb_node *m;
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down_read(maps__lock(maps));
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p = maps__entries(maps)->rb_node;
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while (p != NULL) {
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m = rb_entry(p, struct map_rb_node, rb_node);
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if (ip < map__start(m->map))
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p = p->rb_left;
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else if (ip >= map__end(m->map))
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p = p->rb_right;
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else
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goto out;
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}
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m = NULL;
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out:
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up_read(maps__lock(maps));
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return m ? m->map : NULL;
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}
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struct map_rb_node *maps__first(struct maps *maps)
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{
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struct rb_node *first = rb_first(maps__entries(maps));
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if (first)
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return rb_entry(first, struct map_rb_node, rb_node);
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return NULL;
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}
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struct map_rb_node *map_rb_node__next(struct map_rb_node *node)
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{
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struct rb_node *next;
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if (!node)
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return NULL;
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next = rb_next(&node->rb_node);
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if (!next)
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return NULL;
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return rb_entry(next, struct map_rb_node, rb_node);
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}
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