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https://github.com/JakeHillion/drgn.git
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a213573b23
On x86-64, the difference between virtual addresses in the direct map and the corresponding physical addresses is called PAGE_OFFSET, so we exposed that via an architecture callback and the Linux kernel object finder. However, this doesn't translate to other architectures. Namely, on AArch64, the difference is PAGE_OFFSET - PHYS_OFFSET, and both PAGE_OFFSET and PHYS_OFFSET have varied over time and between configurations. We can remove the architecture callback and avoid version-specific logic by letting the page table tell us the offset. We just need an address in the direct map, which is easy to find since this includes kmalloc and memblock allocations. Signed-off-by: Omar Sandoval <osandov@osandov.com>
83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
// Copyright (c) Meta Platforms, Inc. and affiliates.
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// SPDX-License-Identifier: GPL-3.0-or-later
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/**
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* @file
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*
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* Helpers implemented in C.
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*
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* Most drgn helpers are implemented in Python. However, there are a few that we
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* need internally in libdrgn, so they are implemented in C, instead.
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*/
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#ifndef DRGN_HELPERS_H
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#define DRGN_HELPERS_H
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#include <stddef.h>
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#include <stdint.h>
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#include "drgn.h"
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struct drgn_object;
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struct drgn_program;
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struct drgn_error *linux_helper_direct_mapping_offset(struct drgn_program *prog,
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uint64_t *ret);
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struct drgn_error *linux_helper_read_vm(struct drgn_program *prog,
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uint64_t pgtable, uint64_t virt_addr,
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void *buf, size_t count);
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struct drgn_error *linux_helper_per_cpu_ptr(struct drgn_object *res,
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const struct drgn_object *ptr,
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uint64_t cpu);
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struct drgn_error *linux_helper_idle_task(struct drgn_object *res,
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uint64_t cpu);
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struct drgn_error *
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linux_helper_radix_tree_lookup(struct drgn_object *res,
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const struct drgn_object *root, uint64_t index);
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struct drgn_error *linux_helper_idr_find(struct drgn_object *res,
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const struct drgn_object *idr,
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uint64_t id);
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struct drgn_error *linux_helper_find_pid(struct drgn_object *res,
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const struct drgn_object *ns,
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uint64_t pid);
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struct drgn_error *linux_helper_pid_task(struct drgn_object *res,
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const struct drgn_object *pid,
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uint64_t pid_type);
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struct drgn_error *linux_helper_find_task(struct drgn_object *res,
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const struct drgn_object *ns,
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uint64_t pid);
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struct linux_helper_task_iterator {
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struct drgn_object task;
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struct drgn_qualified_type task_struct_type;
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uint64_t init_task_address;
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uint64_t thread_group_address;
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bool done;
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};
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struct drgn_error *
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linux_helper_task_iterator_init(struct linux_helper_task_iterator *it,
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struct drgn_program *prog);
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void linux_helper_task_iterator_deinit(struct linux_helper_task_iterator *it);
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/**
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* Get the next task from a @ref linux_helper_task_iterator.
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*
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* @param[out] ret Returned `struct task_struct *` object. This is valid until
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* the next call to this function on the same @p it or until @p it is destroyed.
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*/
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struct drgn_error *
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linux_helper_task_iterator_next(struct linux_helper_task_iterator *it,
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const struct drgn_object **ret);
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#endif /* DRGN_HELPERS_H */
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