tools/testing/selftests/bpf/progs/test_task_pt_regs.c

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