Orange Pi5 kernel

// 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;
}