tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
3#include "vmlinux.h"
4#include <bpf/bpf_helpers.h>
5#include <bpf/bpf_tracing.h>
6#include <bpf/bpf_core_read.h>
7#include "bpf_misc.h"
8
9char _license[] SEC("license") = "GPL";
10
11static long stack[256];
12
13/*
14 * KPROBE contexts
15 */
16
17__weak int kprobe_typedef_ctx_subprog(bpf_user_pt_regs_t *ctx)
18{
19 return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
20}
21
22SEC("?kprobe")
23__success
24int kprobe_typedef_ctx(void *ctx)
25{
26 return kprobe_typedef_ctx_subprog(ctx);
27}
28
29#define pt_regs_struct_t typeof(*(__PT_REGS_CAST((struct pt_regs *)NULL)))
30
31__weak int kprobe_struct_ctx_subprog(pt_regs_struct_t *ctx)
32{
33 return bpf_get_stack((void *)ctx, &stack, sizeof(stack), 0);
34}
35
36SEC("?kprobe")
37__success
38int kprobe_resolved_ctx(void *ctx)
39{
40 return kprobe_struct_ctx_subprog(ctx);
41}
42
43/* this is current hack to make this work on old kernels */
44struct bpf_user_pt_regs_t {};
45
46__weak int kprobe_workaround_ctx_subprog(struct bpf_user_pt_regs_t *ctx)
47{
48 return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
49}
50
51SEC("?kprobe")
52__success
53int kprobe_workaround_ctx(void *ctx)
54{
55 return kprobe_workaround_ctx_subprog(ctx);
56}
57
58/*
59 * RAW_TRACEPOINT contexts
60 */
61
62__weak int raw_tp_ctx_subprog(struct bpf_raw_tracepoint_args *ctx)
63{
64 return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
65}
66
67SEC("?raw_tp")
68__success
69int raw_tp_ctx(void *ctx)
70{
71 return raw_tp_ctx_subprog(ctx);
72}
73
74/*
75 * RAW_TRACEPOINT_WRITABLE contexts
76 */
77
78__weak int raw_tp_writable_ctx_subprog(struct bpf_raw_tracepoint_args *ctx)
79{
80 return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
81}
82
83SEC("?raw_tp")
84__success
85int raw_tp_writable_ctx(void *ctx)
86{
87 return raw_tp_writable_ctx_subprog(ctx);
88}
89
90/*
91 * PERF_EVENT contexts
92 */
93
94__weak int perf_event_ctx_subprog(struct bpf_perf_event_data *ctx)
95{
96 return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
97}
98
99SEC("?perf_event")
100__success
101int perf_event_ctx(void *ctx)
102{
103 return perf_event_ctx_subprog(ctx);
104}