unwind.h

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __UNWIND_H
#define __UNWIND_H

#include <linux/compiler.h>
#include <linux/types.h>

struct map;
struct perf_sample;
struct symbol;
struct thread;

struct unwind_entry {
    struct map  *map;
    struct symbol   *sym;
    u64     ip;
};

typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry, void *arg);

struct unwind_libunwind_ops {
    int (*prepare_access)(struct thread *thread);
    void (*flush_access)(struct thread *thread);
    void (*finish_access)(struct thread *thread);
    int (*get_entries)(unwind_entry_cb_t cb, void *arg,
               struct thread *thread,
               struct perf_sample *data, int max_stack);
};

#ifdef HAVE_DWARF_UNWIND_SUPPORT
int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
            struct thread *thread,
            struct perf_sample *data, int max_stack);
/* libunwind specific */
#ifdef HAVE_LIBUNWIND_SUPPORT
#ifndef LIBUNWIND__ARCH_REG_ID
#define LIBUNWIND__ARCH_REG_ID(regnum) libunwind__arch_reg_id(regnum)
#endif

#ifndef LIBUNWIND__ARCH_REG_SP
#define LIBUNWIND__ARCH_REG_SP PERF_REG_SP
#endif

#ifndef LIBUNWIND__ARCH_REG_IP
#define LIBUNWIND__ARCH_REG_IP PERF_REG_IP
#endif

int LIBUNWIND__ARCH_REG_ID(int regnum);
int unwind__prepare_access(struct thread *thread, struct map *map,
               bool *initialized);
void unwind__flush_access(struct thread *thread);
void unwind__finish_access(struct thread *thread);
#else
static inline int unwind__prepare_access(struct thread *thread __maybe_unused,
                     struct map *map __maybe_unused,
                     bool *initialized __maybe_unused)
{
    return 0;
}

static inline void unwind__flush_access(struct thread *thread __maybe_unused) {}
static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
#endif
#else
static inline int
unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
            void *arg __maybe_unused,
            struct thread *thread __maybe_unused,
            struct perf_sample *data __maybe_unused,
            int max_stack __maybe_unused)
{
    return 0;
}

static inline int unwind__prepare_access(struct thread *thread __maybe_unused,
                     struct map *map __maybe_unused,
                     bool *initialized __maybe_unused)
{
    return 0;
}

static inline void unwind__flush_access(struct thread *thread __maybe_unused) {}
static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
#endif /* HAVE_DWARF_UNWIND_SUPPORT */
#endif /* __UNWIND_H */