perf-eh_elf/util/unwind-libunwind.c

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Merge tag 'afs-fixes-20180514' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs Pull AFS fixes from David Howells: "Here's a set of patches that fix a number of bugs in the in-kernel AFS client, including: - Fix directory locking to not use individual page locks for directory reading/scanning but rather to use a semaphore on the afs_vnode struct as the directory contents must be read in a single blob and data from different reads must not be mixed as the entire contents may be shuffled about between reads. - Fix address list parsing to handle port specifiers correctly. - Only give up callback records on a server if we actually talked to that server (we might not be able to access a server). - Fix some callback handling bugs, including refcounting, whole-volume callbacks and when callbacks actually get broken in response to a CB.CallBack op. - Fix some server/address rotation bugs, including giving up if we can't probe a server; giving up if a server says it doesn't have a volume, but there are more servers to try. - Fix the decoding of fetched statuses to be OpenAFS compatible. - Fix the handling of server lookups in Cache Manager ops (such as CB.InitCallBackState3) to use a UUID if possible and to handle no server being found. - Fix a bug in server lookup where not all addresses are compared. - Fix the non-encryption of calls that prevents some servers from being accessed (this also requires an AF_RXRPC patch that has already gone in through the net tree). There's also a patch that adds tracepoints to log Cache Manager ops that don't find a matching server, either by UUID or by address" * tag 'afs-fixes-20180514' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: afs: Fix the non-encryption of calls afs: Fix CB.CallBack handling afs: Fix whole-volume callback handling afs: Fix afs_find_server search loop afs: Fix the handling of an unfound server in CM operations afs: Add a tracepoint to record callbacks from unlisted servers afs: Fix the handling of CB.InitCallBackState3 to find the server by UUID afs: Fix VNOVOL handling in address rotation afs: Fix AFSFetchStatus decoder to provide OpenAFS compatibility afs: Fix server rotation's handling of fileserver probe failure afs: Fix refcounting in callback registration afs: Fix giving up callbacks on server destruction afs: Fix address list parsing afs: Fix directory page locking
2018-05-15 19:48:36 +02:00
// SPDX-License-Identifier: GPL-2.0
#include "unwind.h"
#include "thread.h"
#include "session.h"
#include "debug.h"
#include "env.h"
struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
static void unwind__register_ops(struct thread *thread,
struct unwind_libunwind_ops *ops)
{
thread->unwind_libunwind_ops = ops;
}
int unwind__prepare_access(struct thread *thread, struct map *map,
bool *initialized)
{
const char *arch;
enum dso_type dso_type;
struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
int err;
if (thread->addr_space) {
pr_debug("unwind: thread map already set, dso=%s\n",
map->dso->name);
if (initialized)
*initialized = true;
return 0;
}
/* env->arch is NULL for live-mode (i.e. perf top) */
if (!thread->mg->machine->env || !thread->mg->machine->env->arch)
goto out_register;
dso_type = dso__type(map->dso, thread->mg->machine);
if (dso_type == DSO__TYPE_UNKNOWN)
return 0;
arch = perf_env__arch(thread->mg->machine->env);
if (!strcmp(arch, "x86")) {
if (dso_type != DSO__TYPE_64BIT)
ops = x86_32_unwind_libunwind_ops;
} else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) {
if (dso_type == DSO__TYPE_64BIT)
ops = arm64_unwind_libunwind_ops;
}
if (!ops) {
pr_err("unwind: target platform=%s is not supported\n", arch);
return 0;
}
out_register:
unwind__register_ops(thread, ops);
err = thread->unwind_libunwind_ops->prepare_access(thread);
if (initialized)
*initialized = err ? false : true;
return err;
}
void unwind__flush_access(struct thread *thread)
{
if (thread->unwind_libunwind_ops)
thread->unwind_libunwind_ops->flush_access(thread);
}
void unwind__finish_access(struct thread *thread)
{
if (thread->unwind_libunwind_ops)
thread->unwind_libunwind_ops->finish_access(thread);
}
int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
struct thread *thread,
struct perf_sample *data, int max_stack)
{
if (thread->unwind_libunwind_ops)
return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
return 0;
}