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Buat File | Buat Folder

Dir : ~/usr/share/systemtap/tapset/bpf/

Edit File: exit.stp

/**
 * function _set_exit_status
 *
 * Description: Set exit flag.
 */
function _set_exit_status:long ()
%{ /* bpf */ /* unprivileged */ 
    0x118, 1, 0, 0, 0;          /* BPF_LD_MAP_FD(r1, map0) */
    0x7a, 10, 0, -8, 1; 	/* *(u64 *)(r10 - 8) = 1 (map value) */
    0xbf, 3, 10, 0, 0;  	/* r3 = r10 */
    0x07, 3, 0, 0, -8; 		/* r3 += -8 */
    0x62, 10, 0, -12, 0;  	/* *(u32 *)(r10 - 12) = 0 (map key) */ 
    0xbf, 2, 10, 0, 0;  	/* r2 = r10 */ 
    0x07, 2, 0, 0, -12;  	/* r2 += -12 */
    0xb7, 4, 0, 0, 0;		/* r4 = 0 (flags) */ 
    0x85, 0, 0, 0, 2;   	/* call bpf_map_update_elem */ 
    0xbf, $$, 0, 0, 0           /* return r0 */
%}

/**
 * function _send_exit_msg
 *
 * Description: Send an exit request through perf_events transport.
 */
function _send_exit_msg:long ()
%{ /* bpf */ /* unprivileged */
    0x118, $perf_events_map, -, -, 1; /* BPF_LD_MAP_FD($perf_events_map, map1) */
    alloc, $data, 8, align;
    0x7a, $data, -, -, 0x0;  /* stdw [$data+0], STP_EXIT */
    call, $rc, perf_event_output, $ctx, $perf_events_map, BPF_F_CURRENT_CPU, $data, 8;
%}

/**
 * function _send_error_msg
 *
 * Description: Communicate a hard error through perf_events transport.
 */
function _send_error_msg:long ()
%{ /* bpf */ /* unprivileged */
    0x118, $perf_events_map, -, -, 1; /* BPF_LD_MAP_FD($perf_events_map, map1) */
    alloc, $data, 8, align;
    0x7a, $data, 0, 0, 1; /* stdw [$data+0], STP_ERROR */
    call, $rc, perf_event_output, $ctx, $perf_events_map, BPF_F_CURRENT_CPU, $data, 8;
%}

/**
 * function _jump_to_catch
 *
 * Description: Wrapper for the jump_to_catch statement. Checks if there is a catch
 * block that can be jumped to, and jumps if there is a valid block. It also passes 
 * the error message during compile time for the creation of the catch block.
 */
function _jump_to_catch(msg:string)
%{ /* bpf */ /* unprivileged */
   jump_to_catch, $msg;
%}

/**
 * function _register_error
 *
 * Description: Wrapper for the register_error statement. This function only runs after
 * the program encounters an error outside try blocks. During runtime, it will increment
 * the total error count and check that against the limit provided with -D. It will also
 * pass the error message to the userspace during runtime for printing in the epilogue.
 */
function _register_error(msg:string)
%{ /* bpf */ /* unprivileged */
   register_error, $msg;
%}

/**
 * function _terminate
 *
 * Description: Wrapper for the terminate statement. Short-circuit's the program to exit.
 */
function _terminate()
%{ /* bpf */ /* unpriviledged */
   terminate;
%}