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79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/* Macros for defining Systemtap <sys/sdt.h> static probe points.
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Copyright (C) 2012-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _STAP_PROBE_H
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#define _STAP_PROBE_H 1
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#ifdef USE_STAP_PROBE
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# include <stap-probe-machine.h>
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# include <sys/sdt.h>
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/* Our code uses one macro LIBC_PROBE (name, n, arg1, ..., argn).
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Without USE_STAP_PROBE, that does nothing but evaluates all
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its arguments (to prevent bit rot, unlike e.g. assert).
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Systemtap's header defines the macros STAP_PROBE (provider, name) and
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STAP_PROBEn (provider, name, arg1, ..., argn). For "provider" we paste
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in MODULE_NAME (libc, libpthread, etc.) automagically.
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The format of the arg parameters is discussed here:
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https://sourceware.org/systemtap/wiki/UserSpaceProbeImplementation
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The precise details of how register names are specified is
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architecture specific and can be found in the gdb and SystemTap
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source code. */
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# define LIBC_PROBE(name, n, ...) \
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LIBC_PROBE_1 (MODULE_NAME, name, n, ## __VA_ARGS__)
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# define LIBC_PROBE_1(lib, name, n, ...) \
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STAP_PROBE##n (lib, name, ## __VA_ARGS__)
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# define STAP_PROBE0 STAP_PROBE
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# define LIBC_PROBE_ASM(name, template) \
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STAP_PROBE_ASM (MODULE_NAME, name, template)
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# define LIBC_PROBE_ASM_OPERANDS STAP_PROBE_ASM_OPERANDS
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#else /* Not USE_STAP_PROBE. */
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# ifndef __ASSEMBLER__
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/* Evaluate all the arguments and verify that N matches their number. */
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# define LIBC_PROBE(name, n, ...) STAP_PROBE##n (__VA_ARGS__)
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# define STAP_PROBE0() do {} while (0)
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# define STAP_PROBE1(a1) do {} while (0)
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# define STAP_PROBE2(a1, a2) do {} while (0)
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# define STAP_PROBE3(a1, a2, a3) do {} while (0)
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# define STAP_PROBE4(a1, a2, a3, a4) do {} while (0)
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# else
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# define LIBC_PROBE(name, n, ...) /* Nothing. */
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# endif
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# define LIBC_PROBE_ASM(name, template) /* Nothing. */
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# define LIBC_PROBE_ASM_OPERANDS(n, ...) /* Nothing. */
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#endif /* USE_STAP_PROBE. */
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#endif /* stap-probe.h */
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