// SPDX-License-Identifier: GPL-2.0
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#include "unwind.h"
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#include "dso.h"
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#include "map.h"
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#include "thread.h"
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#include "session.h"
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#include "debug.h"
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#include "env.h"
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#include "callchain.h"
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struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
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struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
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struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
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static void unwind__register_ops(struct maps *maps, struct unwind_libunwind_ops *ops)
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{
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maps->unwind_libunwind_ops = ops;
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}
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int unwind__prepare_access(struct maps *maps, struct map *map, bool *initialized)
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{
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const char *arch;
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enum dso_type dso_type;
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struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
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int err;
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if (!dwarf_callchain_users)
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return 0;
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if (maps->addr_space) {
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pr_debug("unwind: thread map already set, dso=%s\n",
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map->dso->name);
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if (initialized)
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*initialized = true;
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return 0;
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}
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/* env->arch is NULL for live-mode (i.e. perf top) */
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if (!maps->machine->env || !maps->machine->env->arch)
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goto out_register;
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dso_type = dso__type(map->dso, maps->machine);
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if (dso_type == DSO__TYPE_UNKNOWN)
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return 0;
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arch = perf_env__arch(maps->machine->env);
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if (!strcmp(arch, "x86")) {
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if (dso_type != DSO__TYPE_64BIT)
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ops = x86_32_unwind_libunwind_ops;
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} else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) {
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if (dso_type == DSO__TYPE_64BIT)
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ops = arm64_unwind_libunwind_ops;
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}
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if (!ops) {
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pr_err("unwind: target platform=%s is not supported\n", arch);
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return 0;
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}
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out_register:
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unwind__register_ops(maps, ops);
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err = maps->unwind_libunwind_ops->prepare_access(maps);
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if (initialized)
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*initialized = err ? false : true;
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return err;
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}
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void unwind__flush_access(struct maps *maps)
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{
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if (maps->unwind_libunwind_ops)
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maps->unwind_libunwind_ops->flush_access(maps);
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}
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void unwind__finish_access(struct maps *maps)
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{
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if (maps->unwind_libunwind_ops)
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maps->unwind_libunwind_ops->finish_access(maps);
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}
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int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
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struct thread *thread,
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struct perf_sample *data, int max_stack)
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{
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if (thread->maps->unwind_libunwind_ops)
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return thread->maps->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
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return 0;
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}
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