| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | |
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| 3 | #include "vmlinux.h" |
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| 4 | #include <bpf/bpf_helpers.h> |
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| 5 | #include <bpf/bpf_tracing.h> |
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| 6 | |
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| 7 | #define PT_REGS_SIZE sizeof(struct pt_regs) |
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| 8 | |
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| 9 | /* |
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| 10 | * The kernel struct pt_regs isn't exported in its entirety to userspace. |
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| 11 | * Pass it as an array to task_pt_regs.c |
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| 12 | */ |
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| 13 | char current_regs[PT_REGS_SIZE] = {}; |
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| 14 | char ctx_regs[PT_REGS_SIZE] = {}; |
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| 15 | int uprobe_res = 0; |
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| 16 | |
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| 17 | SEC("uprobe" ) |
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| 18 | int handle_uprobe(struct pt_regs *ctx) |
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| 19 | { |
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| 20 | struct task_struct *current; |
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| 21 | struct pt_regs *regs; |
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| 22 | |
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| 23 | current = bpf_get_current_task_btf(); |
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| 24 | regs = (struct pt_regs *) bpf_task_pt_regs(current); |
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| 25 | if (bpf_probe_read_kernel(current_regs, PT_REGS_SIZE, regs)) |
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| 26 | return 0; |
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| 27 | if (bpf_probe_read_kernel(ctx_regs, PT_REGS_SIZE, ctx)) |
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| 28 | return 0; |
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| 29 | |
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| 30 | /* Prove that uprobe was run */ |
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| 31 | uprobe_res = 1; |
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| 32 | |
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| 33 | return 0; |
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| 34 | } |
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| 35 | |
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| 36 | char _license[] SEC("license" ) = "GPL" ; |
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| 37 | |
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