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1532593826
Add a utility function to fetch executable code. Convert one user over to it. There are more places doing that, but they do significantly different actions, so they are not easy to fit into a single library function. Committer changes: . No need to cast around, make 'buf' be a void pointer. . Rename it to thread__memcpy() to reflect the fact it is about copying a chunk of memory from a thread, i.e. from its address space. . No need to have it in a separate object file, move it to thread.[ch] . Check the return of map__load(), the original code didn't do it, but since we're moving this around, check that as well. Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/r/20190305144758.12397-2-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
419 lines
9.3 KiB
C
419 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "../perf.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <linux/kernel.h>
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#include "session.h"
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#include "thread.h"
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#include "thread-stack.h"
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#include "util.h"
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#include "debug.h"
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#include "namespaces.h"
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#include "comm.h"
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#include "map.h"
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#include "symbol.h"
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#include "unwind.h"
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#include <api/fs/fs.h>
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int thread__init_map_groups(struct thread *thread, struct machine *machine)
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{
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pid_t pid = thread->pid_;
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if (pid == thread->tid || pid == -1) {
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thread->mg = map_groups__new(machine);
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} else {
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struct thread *leader = __machine__findnew_thread(machine, pid, pid);
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if (leader) {
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thread->mg = map_groups__get(leader->mg);
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thread__put(leader);
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}
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}
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return thread->mg ? 0 : -1;
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}
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struct thread *thread__new(pid_t pid, pid_t tid)
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{
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char *comm_str;
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struct comm *comm;
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struct thread *thread = zalloc(sizeof(*thread));
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if (thread != NULL) {
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thread->pid_ = pid;
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thread->tid = tid;
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thread->ppid = -1;
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thread->cpu = -1;
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INIT_LIST_HEAD(&thread->namespaces_list);
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INIT_LIST_HEAD(&thread->comm_list);
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init_rwsem(&thread->namespaces_lock);
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init_rwsem(&thread->comm_lock);
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comm_str = malloc(32);
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if (!comm_str)
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goto err_thread;
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snprintf(comm_str, 32, ":%d", tid);
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comm = comm__new(comm_str, 0, false);
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free(comm_str);
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if (!comm)
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goto err_thread;
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list_add(&comm->list, &thread->comm_list);
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refcount_set(&thread->refcnt, 1);
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RB_CLEAR_NODE(&thread->rb_node);
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/* Thread holds first ref to nsdata. */
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thread->nsinfo = nsinfo__new(pid);
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srccode_state_init(&thread->srccode_state);
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}
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return thread;
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err_thread:
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free(thread);
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return NULL;
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}
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void thread__delete(struct thread *thread)
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{
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struct namespaces *namespaces, *tmp_namespaces;
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struct comm *comm, *tmp_comm;
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BUG_ON(!RB_EMPTY_NODE(&thread->rb_node));
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thread_stack__free(thread);
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if (thread->mg) {
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map_groups__put(thread->mg);
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thread->mg = NULL;
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}
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down_write(&thread->namespaces_lock);
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list_for_each_entry_safe(namespaces, tmp_namespaces,
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&thread->namespaces_list, list) {
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list_del(&namespaces->list);
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namespaces__free(namespaces);
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}
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up_write(&thread->namespaces_lock);
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down_write(&thread->comm_lock);
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list_for_each_entry_safe(comm, tmp_comm, &thread->comm_list, list) {
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list_del(&comm->list);
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comm__free(comm);
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}
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up_write(&thread->comm_lock);
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unwind__finish_access(thread);
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nsinfo__zput(thread->nsinfo);
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srccode_state_free(&thread->srccode_state);
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exit_rwsem(&thread->namespaces_lock);
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exit_rwsem(&thread->comm_lock);
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free(thread);
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}
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struct thread *thread__get(struct thread *thread)
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{
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if (thread)
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refcount_inc(&thread->refcnt);
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return thread;
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}
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void thread__put(struct thread *thread)
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{
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if (thread && refcount_dec_and_test(&thread->refcnt)) {
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/*
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* Remove it from the dead_threads list, as last reference
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* is gone.
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*/
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list_del_init(&thread->node);
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thread__delete(thread);
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}
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}
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struct namespaces *thread__namespaces(const struct thread *thread)
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{
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if (list_empty(&thread->namespaces_list))
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return NULL;
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return list_first_entry(&thread->namespaces_list, struct namespaces, list);
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}
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static int __thread__set_namespaces(struct thread *thread, u64 timestamp,
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struct namespaces_event *event)
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{
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struct namespaces *new, *curr = thread__namespaces(thread);
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new = namespaces__new(event);
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if (!new)
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return -ENOMEM;
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list_add(&new->list, &thread->namespaces_list);
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if (timestamp && curr) {
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/*
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* setns syscall must have changed few or all the namespaces
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* of this thread. Update end time for the namespaces
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* previously used.
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*/
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curr = list_next_entry(new, list);
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curr->end_time = timestamp;
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}
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return 0;
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}
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int thread__set_namespaces(struct thread *thread, u64 timestamp,
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struct namespaces_event *event)
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{
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int ret;
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down_write(&thread->namespaces_lock);
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ret = __thread__set_namespaces(thread, timestamp, event);
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up_write(&thread->namespaces_lock);
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return ret;
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}
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struct comm *thread__comm(const struct thread *thread)
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{
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if (list_empty(&thread->comm_list))
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return NULL;
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return list_first_entry(&thread->comm_list, struct comm, list);
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}
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struct comm *thread__exec_comm(const struct thread *thread)
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{
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struct comm *comm, *last = NULL;
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list_for_each_entry(comm, &thread->comm_list, list) {
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if (comm->exec)
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return comm;
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last = comm;
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}
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return last;
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}
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static int ____thread__set_comm(struct thread *thread, const char *str,
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u64 timestamp, bool exec)
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{
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struct comm *new, *curr = thread__comm(thread);
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/* Override the default :tid entry */
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if (!thread->comm_set) {
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int err = comm__override(curr, str, timestamp, exec);
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if (err)
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return err;
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} else {
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new = comm__new(str, timestamp, exec);
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if (!new)
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return -ENOMEM;
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list_add(&new->list, &thread->comm_list);
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if (exec)
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unwind__flush_access(thread);
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}
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thread->comm_set = true;
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return 0;
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}
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int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
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bool exec)
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{
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int ret;
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down_write(&thread->comm_lock);
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ret = ____thread__set_comm(thread, str, timestamp, exec);
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up_write(&thread->comm_lock);
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return ret;
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}
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int thread__set_comm_from_proc(struct thread *thread)
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{
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char path[64];
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char *comm = NULL;
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size_t sz;
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int err = -1;
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if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
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thread->pid_, thread->tid) >= (int)sizeof(path)) &&
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procfs__read_str(path, &comm, &sz) == 0) {
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comm[sz - 1] = '\0';
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err = thread__set_comm(thread, comm, 0);
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}
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return err;
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}
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static const char *__thread__comm_str(const struct thread *thread)
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{
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const struct comm *comm = thread__comm(thread);
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if (!comm)
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return NULL;
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return comm__str(comm);
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}
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const char *thread__comm_str(const struct thread *thread)
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{
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const char *str;
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down_read((struct rw_semaphore *)&thread->comm_lock);
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str = __thread__comm_str(thread);
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up_read((struct rw_semaphore *)&thread->comm_lock);
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return str;
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}
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/* CHECKME: it should probably better return the max comm len from its comm list */
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int thread__comm_len(struct thread *thread)
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{
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if (!thread->comm_len) {
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const char *comm = thread__comm_str(thread);
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if (!comm)
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return 0;
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thread->comm_len = strlen(comm);
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}
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return thread->comm_len;
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}
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size_t thread__fprintf(struct thread *thread, FILE *fp)
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{
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return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
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map_groups__fprintf(thread->mg, fp);
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}
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int thread__insert_map(struct thread *thread, struct map *map)
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{
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int ret;
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ret = unwind__prepare_access(thread, map, NULL);
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if (ret)
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return ret;
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map_groups__fixup_overlappings(thread->mg, map, stderr);
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map_groups__insert(thread->mg, map);
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return 0;
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}
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static int __thread__prepare_access(struct thread *thread)
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{
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bool initialized = false;
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int err = 0;
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struct maps *maps = &thread->mg->maps;
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struct map *map;
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down_read(&maps->lock);
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for (map = maps__first(maps); map; map = map__next(map)) {
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err = unwind__prepare_access(thread, map, &initialized);
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if (err || initialized)
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break;
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}
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up_read(&maps->lock);
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return err;
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}
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static int thread__prepare_access(struct thread *thread)
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{
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int err = 0;
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if (symbol_conf.use_callchain)
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err = __thread__prepare_access(thread);
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return err;
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}
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static int thread__clone_map_groups(struct thread *thread,
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struct thread *parent,
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bool do_maps_clone)
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{
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/* This is new thread, we share map groups for process. */
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if (thread->pid_ == parent->pid_)
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return thread__prepare_access(thread);
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if (thread->mg == parent->mg) {
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pr_debug("broken map groups on thread %d/%d parent %d/%d\n",
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thread->pid_, thread->tid, parent->pid_, parent->tid);
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return 0;
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}
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/* But this one is new process, copy maps. */
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return do_maps_clone ? map_groups__clone(thread, parent->mg) : 0;
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}
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int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp, bool do_maps_clone)
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{
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if (parent->comm_set) {
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const char *comm = thread__comm_str(parent);
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int err;
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if (!comm)
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return -ENOMEM;
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err = thread__set_comm(thread, comm, timestamp);
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if (err)
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return err;
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}
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thread->ppid = parent->tid;
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return thread__clone_map_groups(thread, parent, do_maps_clone);
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}
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void thread__find_cpumode_addr_location(struct thread *thread, u64 addr,
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struct addr_location *al)
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{
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size_t i;
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const u8 cpumodes[] = {
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PERF_RECORD_MISC_USER,
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PERF_RECORD_MISC_KERNEL,
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PERF_RECORD_MISC_GUEST_USER,
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PERF_RECORD_MISC_GUEST_KERNEL
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};
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for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
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thread__find_symbol(thread, cpumodes[i], addr, al);
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if (al->map)
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break;
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}
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}
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struct thread *thread__main_thread(struct machine *machine, struct thread *thread)
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{
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if (thread->pid_ == thread->tid)
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return thread__get(thread);
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if (thread->pid_ == -1)
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return NULL;
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return machine__find_thread(machine, thread->pid_, thread->pid_);
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}
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int thread__memcpy(struct thread *thread, struct machine *machine,
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void *buf, u64 ip, int len, bool *is64bit)
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{
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u8 cpumode = PERF_RECORD_MISC_USER;
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struct addr_location al;
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long offset;
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if (machine__kernel_ip(machine, ip))
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cpumode = PERF_RECORD_MISC_KERNEL;
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if (!thread__find_map(thread, cpumode, ip, &al) || !al.map->dso ||
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al.map->dso->data.status == DSO_DATA_STATUS_ERROR ||
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map__load(al.map) < 0)
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return -1;
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offset = al.map->map_ip(al.map, ip);
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if (is64bit)
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*is64bit = al.map->dso->is_64_bit;
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return dso__data_read_offset(al.map->dso, machine, offset, buf, len);
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}
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