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// Copyright (c) Meta Platforms, Inc. and affiliates.
// SPDX-License-Identifier: LGPL-2.1-or-later
/**
* @file
*
* Helpers implemented in C.
*
* Most drgn helpers are implemented in Python. However, there are a few that we
* need internally in libdrgn, so they are implemented in C, instead.
*/
#ifndef DRGN_HELPERS_H
#define DRGN_HELPERS_H
#include <stddef.h>
#include <stdint.h>
#include "drgn_internal.h"
struct drgn_object;
struct drgn_program;
struct drgn_error *linux_helper_direct_mapping_offset(struct drgn_program *prog,
uint64_t *ret);
struct drgn_error *linux_helper_read_vm(struct drgn_program *prog,
uint64_t pgtable, uint64_t virt_addr,
void *buf, size_t count);
struct drgn_error *linux_helper_follow_phys(struct drgn_program *prog,
uint64_t pgtable,
uint64_t virt_addr, uint64_t *ret);
struct drgn_error *linux_helper_per_cpu_ptr(struct drgn_object *res,
const struct drgn_object *ptr,
uint64_t cpu);
struct drgn_error *linux_helper_cpu_curr(struct drgn_object *res, uint64_t cpu);
struct drgn_error *linux_helper_idle_task(struct drgn_object *res,
uint64_t cpu);
struct drgn_error *
linux_helper_task_thread_info(struct drgn_object *res,
const struct drgn_object *task);
struct drgn_error *linux_helper_task_cpu(const struct drgn_object *task,
uint64_t *ret);
struct drgn_error *linux_helper_task_on_cpu(const struct drgn_object *task,
bool *ret);
struct drgn_error *
linux_helper_xa_load(struct drgn_object *res, const struct drgn_object *xa,
uint64_t index);
struct drgn_error *linux_helper_idr_find(struct drgn_object *res,
const struct drgn_object *idr,
uint64_t id);
struct drgn_error *linux_helper_find_pid(struct drgn_object *res,
const struct drgn_object *ns,
uint64_t pid);
struct drgn_error *linux_helper_pid_task(struct drgn_object *res,
const struct drgn_object *pid,
uint64_t pid_type);
struct drgn_error *linux_helper_find_task(struct drgn_object *res,
const struct drgn_object *ns,
uint64_t pid);
struct linux_helper_task_iterator {
struct drgn_object tasks_node;
struct drgn_object thread_node;
uint64_t tasks_head;
uint64_t thread_head;
struct drgn_qualified_type task_struct_type;
bool done;
};
struct drgn_error *
linux_helper_task_iterator_init(struct linux_helper_task_iterator *it,
struct drgn_program *prog);
void linux_helper_task_iterator_deinit(struct linux_helper_task_iterator *it);
/** Get the next task from a @ref linux_helper_task_iterator. */
struct drgn_error *
linux_helper_task_iterator_next(struct linux_helper_task_iterator *it,
struct drgn_object *ret);
#endif /* DRGN_HELPERS_H */
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