mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
ee84a3032b
Using accessors will make it easier to add reference count checking in later patches. Committer notes: thread->nsinfo wasn't wrapped as it is used together with nsinfo__zput(), where does a trick to set the field with a refcount being dropped to NULL, and that doesn't work well with using thread__nsinfo(thread), that loses the &thread->nsinfo pointer. When refcount checking is added to 'struct thread', later in this series, nsinfo__zput(RC_CHK_ACCESS(thread)->nsinfo) will be used to check the thread pointer. Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ali Saidi <alisaidi@amazon.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Cc: Brian Robbins <brianrob@linux.microsoft.com> Cc: Changbin Du <changbin.du@huawei.com> Cc: Dmitrii Dolgov <9erthalion6@gmail.com> Cc: Fangrui Song <maskray@google.com> Cc: German Gomez <german.gomez@arm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ivan Babrou <ivan@cloudflare.com> Cc: James Clark <james.clark@arm.com> Cc: Jing Zhang <renyu.zj@linux.alibaba.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.g.garry@oracle.com> Cc: K Prateek Nayak <kprateek.nayak@amd.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Miguel Ojeda <ojeda@kernel.org> Cc: Mike Leach <mike.leach@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Steinar H. Gunderson <sesse@google.com> Cc: Suzuki Poulouse <suzuki.poulose@arm.com> Cc: Wenyu Liu <liuwenyu7@huawei.com> Cc: Will Deacon <will@kernel.org> Cc: Yang Jihong <yangjihong1@huawei.com> Cc: Ye Xingchen <ye.xingchen@zte.com.cn> Cc: Yuan Can <yuancan@huawei.com> Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20230608232823.4027869-4-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include "unwind.h"
|
|
#include "dso.h"
|
|
#include "map.h"
|
|
#include "thread.h"
|
|
#include "session.h"
|
|
#include "debug.h"
|
|
#include "env.h"
|
|
#include "callchain.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 maps *maps, struct unwind_libunwind_ops *ops)
|
|
{
|
|
RC_CHK_ACCESS(maps)->unwind_libunwind_ops = ops;
|
|
}
|
|
|
|
int unwind__prepare_access(struct maps *maps, struct map *map, bool *initialized)
|
|
{
|
|
const char *arch;
|
|
enum dso_type dso_type;
|
|
struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
|
|
struct dso *dso = map__dso(map);
|
|
struct machine *machine;
|
|
int err;
|
|
|
|
if (!dwarf_callchain_users)
|
|
return 0;
|
|
|
|
if (maps__addr_space(maps)) {
|
|
pr_debug("unwind: thread map already set, dso=%s\n", dso->name);
|
|
if (initialized)
|
|
*initialized = true;
|
|
return 0;
|
|
}
|
|
|
|
machine = maps__machine(maps);
|
|
/* env->arch is NULL for live-mode (i.e. perf top) */
|
|
if (!machine->env || !machine->env->arch)
|
|
goto out_register;
|
|
|
|
dso_type = dso__type(dso, machine);
|
|
if (dso_type == DSO__TYPE_UNKNOWN)
|
|
return 0;
|
|
|
|
arch = perf_env__arch(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_warning_once("unwind: target platform=%s is not supported\n", arch);
|
|
return 0;
|
|
}
|
|
out_register:
|
|
unwind__register_ops(maps, ops);
|
|
|
|
err = maps__unwind_libunwind_ops(maps)->prepare_access(maps);
|
|
if (initialized)
|
|
*initialized = err ? false : true;
|
|
return err;
|
|
}
|
|
|
|
void unwind__flush_access(struct maps *maps)
|
|
{
|
|
const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(maps);
|
|
|
|
if (ops)
|
|
ops->flush_access(maps);
|
|
}
|
|
|
|
void unwind__finish_access(struct maps *maps)
|
|
{
|
|
const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(maps);
|
|
|
|
if (ops)
|
|
ops->finish_access(maps);
|
|
}
|
|
|
|
int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
|
|
struct thread *thread,
|
|
struct perf_sample *data, int max_stack,
|
|
bool best_effort)
|
|
{
|
|
const struct unwind_libunwind_ops *ops = maps__unwind_libunwind_ops(thread__maps(thread));
|
|
|
|
if (ops)
|
|
return ops->get_entries(cb, arg, thread, data, max_stack, best_effort);
|
|
return 0;
|
|
}
|