FM / bpf

/usr/share/systemtap/tapset/bpf

Name	Size	Mode	Actions
aux_syscalls.stp	909	0644	edit dl rm
compatdefs.stp	203	0644	edit dl rm
context.stp	6039	0644	edit dl rm
conversions.stp	4727	0644	edit dl rm
exit.stp	2583	0644	edit dl rm
logging.stp	1463	0644	edit dl rm
syscalls.stpm	213	0644	edit dl rm
syscall_any.stp	1569	0644	edit dl rm
syscall_num_arm.stp	38588	0644	edit dl rm
syscall_num_arm64.stp	86596	0644	edit dl rm
syscall_num_mips.stp	110534	0644	edit dl rm
syscall_num_powerpc.stp	71086	0644	edit dl rm
syscall_num_riscv.stp	48422	0644	edit dl rm
syscall_num_s390.stp	68068	0644	edit dl rm
syscall_num_x86_64.stp	65658	0644	edit dl rm
syscall_table.stp	1491	0644	edit dl rm
target.stp	1403	0644	edit dl rm
task.stp	583	0644	edit dl rm
time.stp	539	0644	edit dl rm
timestamp_gtod.stp	2178	0644	edit dl rm
uconversions.stp	8014	0644	edit dl rm

Edit: /usr/share/systemtap/tapset/bpf/target.stp (1403B)

// TODO: get 'call' instruction to handle the functions below

/**
 * function _set_procfs_value - Used to set the message 
 * from a procfs-like probe.
 *
 * Description: This function always returns 0.
 */

function _set_procfs_value:long (msg:string)
%{/* bpf */
   0xbf, 1, $msg, -, -;   /* mov r1, $msg */
   0x85, 0, 0, 0, -6;     /* call BPF_FUNC_SET_PROCFS_VALUE */
   0xbf, $$, 0, -, -;     /* return r0 */
%}

/**
 * function _append_procfs_value - Used to append to 
 * the message for a procfs-like probe.
 *
 * Description: This function always returns 0.
 */

function _append_procfs_value:long (append:string)
%{/* bpf */
   0xbf, 1, $append, -, -;    /* mov r1, $msg */
   0x85, 0, 0, 0, -7;         /* call BPF_FUNC_APPEND_PROCFS_VALUE */
   0xbf, $$, 0, -, -;         /* return r0 */
%}

/**
 * function _get_procfs_value - Used to get the message 
 * for a procfs-like probe.
 *
 * Description: This function returns a pointer to the 
 * message.
 */

function _get_procfs_value:string ()
%{/* bpf */
   0x85, 0, 0, 0, -8;   /* call BPF_FUNC_GET_PROCFS_VALUE */
   0xbf, $$, 0, -, -;   /* return r0 */ 
%}

// target tapset // Copyright (C) 2019 Red Hat Inc. // // This file is part of systemtap, and is free software. You can // redistribute it and/or modify it under the terms of the GNU General // Public License (GPL); either version 2, or (at your option) any // later version. // TODO: get 'call' instruction to handle the functions below /** * function _set_procfs_value - Used to set the message * from a procfs-like probe. * * Description: This function always returns 0. */ function _set_procfs_value:long (msg:string) %{/* bpf */ 0xbf, 1, $msg, -, -; /* mov r1, $msg */ 0x85, 0, 0, 0, -6; /* call BPF_FUNC_SET_PROCFS_VALUE */ 0xbf, $$, 0, -, -; /* return r0 */ %} /** * function _append_procfs_value - Used to append to * the message for a procfs-like probe. * * Description: This function always returns 0. */ function _append_procfs_value:long (append:string) %{/* bpf */ 0xbf, 1, $append, -, -; /* mov r1, $msg */ 0x85, 0, 0, 0, -7; /* call BPF_FUNC_APPEND_PROCFS_VALUE */ 0xbf, $$, 0, -, -; /* return r0 */ %} /** * function _get_procfs_value - Used to get the message * for a procfs-like probe. * * Description: This function returns a pointer to the * message. */ function _get_procfs_value:string () %{/* bpf */ 0x85, 0, 0, 0, -8; /* call BPF_FUNC_GET_PROCFS_VALUE */ 0xbf, $$, 0, -, -; /* return r0 */ %}