[thirdparty/kernel/linux.git] /

// SPDX-License-Identifier: GPL-2.0
#include "unwind.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 map_groups *mg,
                          struct unwind_libunwind_ops *ops)
{
        mg->unwind_libunwind_ops = ops;
}

int unwind__prepare_access(struct map_groups *mg, 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 (mg->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 (!mg->machine->env || !mg->machine->env->arch)
                goto out_register;

        dso_type = dso__type(map->dso, mg->machine);
        if (dso_type == DSO__TYPE_UNKNOWN)
                return 0;

        arch = perf_env__arch(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(mg, ops);

        err = mg->unwind_libunwind_ops->prepare_access(mg);
        if (initialized)
                *initialized = err ? false : true;
        return err;
}

void unwind__flush_access(struct map_groups *mg)
{
        if (mg->unwind_libunwind_ops)
                mg->unwind_libunwind_ops->flush_access(mg);
}

void unwind__finish_access(struct map_groups *mg)
{
        if (mg->unwind_libunwind_ops)
                mg->unwind_libunwind_ops->finish_access(mg);
}

int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
                         struct thread *thread,
                         struct perf_sample *data, int max_stack)
{
        if (thread->mg->unwind_libunwind_ops)
                return thread->mg->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
        return 0;
}