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Diffstat (limited to '')
-rw-r--r-- | tools/perf/util/unwind-libunwind.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c new file mode 100644 index 000000000..b029a5e9a --- /dev/null +++ b/tools/perf/util/unwind-libunwind.c @@ -0,0 +1,84 @@ +// 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; +} |