79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
/* Macros for defining Systemtap <sys/sdt.h> static probe points.
|
|
Copyright (C) 2012-2019 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _STAP_PROBE_H
|
|
#define _STAP_PROBE_H 1
|
|
|
|
#ifdef USE_STAP_PROBE
|
|
|
|
# include <stap-probe-machine.h>
|
|
# include <sys/sdt.h>
|
|
|
|
/* Our code uses one macro LIBC_PROBE (name, n, arg1, ..., argn).
|
|
|
|
Without USE_STAP_PROBE, that does nothing but evaluates all
|
|
its arguments (to prevent bit rot, unlike e.g. assert).
|
|
|
|
Systemtap's header defines the macros STAP_PROBE (provider, name) and
|
|
STAP_PROBEn (provider, name, arg1, ..., argn). For "provider" we paste
|
|
in MODULE_NAME (libc, libpthread, etc.) automagically.
|
|
|
|
The format of the arg parameters is discussed here:
|
|
|
|
https://sourceware.org/systemtap/wiki/UserSpaceProbeImplementation
|
|
|
|
The precise details of how register names are specified is
|
|
architecture specific and can be found in the gdb and SystemTap
|
|
source code. */
|
|
|
|
# define LIBC_PROBE(name, n, ...) \
|
|
LIBC_PROBE_1 (MODULE_NAME, name, n, ## __VA_ARGS__)
|
|
|
|
# define LIBC_PROBE_1(lib, name, n, ...) \
|
|
STAP_PROBE##n (lib, name, ## __VA_ARGS__)
|
|
|
|
# define STAP_PROBE0 STAP_PROBE
|
|
|
|
# define LIBC_PROBE_ASM(name, template) \
|
|
STAP_PROBE_ASM (MODULE_NAME, name, template)
|
|
|
|
# define LIBC_PROBE_ASM_OPERANDS STAP_PROBE_ASM_OPERANDS
|
|
|
|
#else /* Not USE_STAP_PROBE. */
|
|
|
|
# ifndef __ASSEMBLER__
|
|
/* Evaluate all the arguments and verify that N matches their number. */
|
|
# define LIBC_PROBE(name, n, ...) STAP_PROBE##n (__VA_ARGS__)
|
|
|
|
# define STAP_PROBE0()
|
|
# define STAP_PROBE1(a1)
|
|
# define STAP_PROBE2(a1, a2)
|
|
# define STAP_PROBE3(a1, a2, a3)
|
|
# define STAP_PROBE4(a1, a2, a3, a4)
|
|
|
|
# else
|
|
# define LIBC_PROBE(name, n, ...) /* Nothing. */
|
|
# endif
|
|
|
|
# define LIBC_PROBE_ASM(name, template) /* Nothing. */
|
|
# define LIBC_PROBE_ASM_OPERANDS(n, ...) /* Nothing. */
|
|
|
|
#endif /* USE_STAP_PROBE. */
|
|
|
|
#endif /* stap-probe.h */
|