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- // 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)
- {
- 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;
- int err;
- if (!dwarf_callchain_users)
- return 0;
- if (maps->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 (!maps->machine->env || !maps->machine->env->arch)
- goto out_register;
- dso_type = dso__type(map->dso, maps->machine);
- if (dso_type == DSO__TYPE_UNKNOWN)
- return 0;
- arch = perf_env__arch(maps->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(maps, ops);
- err = maps->unwind_libunwind_ops->prepare_access(maps);
- if (initialized)
- *initialized = err ? false : true;
- return err;
- }
- void unwind__flush_access(struct maps *maps)
- {
- if (maps->unwind_libunwind_ops)
- maps->unwind_libunwind_ops->flush_access(maps);
- }
- void unwind__finish_access(struct maps *maps)
- {
- if (maps->unwind_libunwind_ops)
- maps->unwind_libunwind_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)
- {
- if (thread->maps->unwind_libunwind_ops)
- return thread->maps->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
- return 0;
- }
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