mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 21:38:32 +08:00
a2873325ff
Adding initialized arg into unwind__prepare_access to get feedback about the initialization state. It's not possible to get it from error code, because we return 0 even in case we don't recognize dso, which is valid. The 'initialized' value is used in following patch to speedup unwind__prepare_access calls logic in fork path. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: He Kuang <hekuang@huawei.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1467634583-29147-4-git-send-email-jolsa@kernel.org [ Remove ; after static inline function signatures, fixes build break ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
#include "unwind.h"
|
|
#include "thread.h"
|
|
#include "session.h"
|
|
#include "debug.h"
|
|
#include "arch/common.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 = normalize_arch(thread->mg->machine->env->arch);
|
|
|
|
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 -1;
|
|
}
|
|
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;
|
|
}
|