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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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