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Add --enable-systemtap configuration to define static probe points.

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This commit is contained in:
Roland McGrath 2012-05-25 13:40:20 -07:00
parent 21708942c9
commit 3a097cc7a1
10 changed files with 179 additions and 5 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2012-05-25 Roland McGrath <roland@hack.frob.com>
* include/stap-probe.h: New file.
* configure.in: Handle --enable-systemtap.
* configure: Regenerated.
* config.h.in (USE_STAP_PROBE): New #undef.
* extra-lib.mk (CPPFLAGS-$(lib)): Add -DIN_LIB=$(lib).
* elf/Makefile (CPPFLAGS-.os): Add -DIN_LIB=rtld.
* elf/rtld-Rules (rtld-CPPFLAGS): Likewise.
2012-05-25 Joseph Myers <joseph@codesourcery.com>
[BZ #13717]

4
config.h.in
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@ -181,6 +181,10 @@
/* Define if obsolete RPC code should be made available for user-level code
to link against. */
#undef LINK_OBSOLETE_RPC
/* Define if Systemtap <sys/sdt.h> probes should be defined. */
#undef USE_STAP_PROBE
/*
*/

48
configure vendored
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@ -784,6 +784,7 @@ enable_all_warnings
enable_multi_arch
enable_nss_crypt
enable_obsolete_rpc
enable_systemtap
with_cpu
'
ac_precious_vars='build_alias
@ -1441,6 +1442,7 @@ Optional Features:
--enable-nss-crypt enable libcrypt to use nss
--enable-obsolete-rpc build and install the obsolete RPC code for
link-time usage
--enable-systemtap enable systemtap static probe points [default=no]
Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
@ -3753,6 +3755,7 @@ else
fi
# Check whether --enable-obsolete-rpc was given.
if test "${enable_obsolete_rpc+set}" = set; then :
enableval=$enable_obsolete_rpc; link_obsolete_rpc=$enableval
@ -3767,6 +3770,51 @@ if test "$link_obsolete_rpc" = yes; then
fi
# Check whether --enable-systemtap was given.
if test "${enable_systemtap+set}" = set; then :
enableval=$enable_systemtap; systemtap=$enableval
else
systemtap=no
fi
if test "x$systemtap" != xno; then
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for systemtap static probe support" >&5
$as_echo_n "checking for systemtap static probe support... " >&6; }
if ${libc_cv_sdt+:} false; then :
$as_echo_n "(cached) " >&6
else
old_CFLAGS="$CFLAGS"
CFLAGS="-std=gnu99 $CFLAGS"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#include <sys/sdt.h>
void foo (int i, void *p)
{
asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
:: STAP_PROBE_ASM_OPERANDS (2, i, p));
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
libc_cv_sdt=yes
else
libc_cv_sdt=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
CFLAGS="$old_CFLAGS"
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_sdt" >&5
$as_echo "$libc_cv_sdt" >&6; }
if test $libc_cv_sdt = yes; then
$as_echo "#define USE_STAP_PROBE 1" >>confdefs.h
elif test "x$systemtap" != xauto; then
{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
as_fn_error $? "systemtap support needs sys/sdt.h with asm support
See \`config.log' for more details" "$LINENO" 5; }
fi
fi
# The way shlib-versions is used to generate soversions.mk uses a
# fairly simplistic model for name recognition that can't distinguish
# i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os

24
configure.in
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@ -252,6 +252,7 @@ else
fi
AC_SUBST(libc_cv_nss_crypt)
AC_ARG_ENABLE([obsolete-rpc],
AC_HELP_STRING([--enable-obsolete-rpc],
[build and install the obsolete RPC code for link-time usage]),
@ -263,6 +264,29 @@ if test "$link_obsolete_rpc" = yes; then
AC_DEFINE(LINK_OBSOLETE_RPC)
fi
AC_ARG_ENABLE([systemtap],
[AS_HELP_STRING([--enable-systemtap],
[enable systemtap static probe points @<:@default=no@:>@])],
[systemtap=$enableval],
[systemtap=no])
if test "x$systemtap" != xno; then
AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
old_CFLAGS="$CFLAGS"
CFLAGS="-std=gnu99 $CFLAGS"
AC_COMPILE_IFELSE([#include <sys/sdt.h>
void foo (int i, void *p)
{
asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
:: STAP_PROBE_ASM_OPERANDS (2, i, p));
}], [libc_cv_sdt=yes], [libc_cv_sdt=no])
CFLAGS="$old_CFLAGS"])
if test $libc_cv_sdt = yes; then
AC_DEFINE([USE_STAP_PROBE])
elif test "x$systemtap" != xauto; then
AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
fi
fi
# The way shlib-versions is used to generate soversions.mk uses a
# fairly simplistic model for name recognition that can't distinguish
# i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os

3
elf/Makefile
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@ -422,7 +422,8 @@ CFLAGS-dl-cache.c = $(SYSCONF-FLAGS)
CFLAGS-cache.c = $(SYSCONF-FLAGS)
CFLAGS-rtld.c = $(SYSCONF-FLAGS)
CPPFLAGS-.os += $(if $(filter $(@F),$(patsubst %,%.os,$(all-rtld-routines))),-DNOT_IN_libc=1 -DIS_IN_rtld=1)
CPPFLAGS-.os += $(if $(filter $(@F),$(patsubst %,%.os,$(all-rtld-routines))),\
-DNOT_IN_libc=1 -DIS_IN_rtld=1 -DIN_LIB=rtld)
test-modules = $(addprefix $(objpfx),$(addsuffix .so,$(strip $(modules-names))))
generated += $(addsuffix .so,$(strip $(modules-names)))

5
elf/rtld-Rules
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@ -1,7 +1,6 @@
# Subroutine makefile for compiling libc modules linked into dynamic linker.
# Copyright (C) 2002,2003,2005,2006,2008,2010,2011
# Free Software Foundation, Inc.
# Copyright (C) 2002-2012 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
@ -130,6 +129,6 @@ ifdef rtld-depfiles
endif
# This here is the whole point of all the shenanigans.
rtld-CPPFLAGS := -DNOT_IN_libc=1 -DIS_IN_rtld=1
rtld-CPPFLAGS := -DNOT_IN_libc=1 -DIS_IN_rtld=1 -DIN_LIB=rtld
endif

2
extra-lib.mk
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@ -101,4 +101,4 @@ ifneq (,$(cpp-srcs-left))
include $(patsubst %,$(..)cppflags-iterator.mk,$(cpp-srcs-left))
endif
CPPFLAGS-$(lib) := -DNOT_IN_libc=1 -DIS_IN_$(lib)=1
CPPFLAGS-$(lib) := -DNOT_IN_libc=1 -DIS_IN_$(lib)=1 -DIN_LIB=$(lib)

80
include/stap-probe.h Normal file
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@ -0,0 +1,80 @@
/* Macros for defining Systemtap <sys/sdt.h> static probe points.
Copyright (C) 2012 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 <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 the IN_LIB name (libc, libpthread, etc.) automagically. */
# ifndef NOT_IN_libc
# define IN_LIB libc
# elif !defined IN_LIB
/* This is intentionally defined with extra unquoted commas in it so
that macro substitution will bomb out when it is used. We don't
just use #error here, so that this header can be included by
other headers that use LIBC_PROBE inside their own macros. We
only want such headers to fail to compile if those macros are
actually used in a context where IN_LIB has not been defined. */
# define IN_LIB ,,,missing -DIN_LIB=... -- not extra-lib.mk?,,,
# endif
# define LIBC_PROBE(name, n, ...) \
LIBC_PROBE_1 (IN_LIB, 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 (IN_LIB, 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, ...) \
do { \
_Bool __libc_probe_args[] = { 0, ## __VA_ARGS__ }; \
_Bool __libc_probe_verify_n[(sizeof __libc_probe_args / sizeof (_Bool)) \
== n + 1 ? 1 : -1]; \
(void) __libc_probe_verify_n; \
} while (0)
# 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 */

4
nptl/ChangeLog
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@ -1,3 +1,7 @@
2012-05-24 Roland McGrath <roland@hack.frob.com>
* pthread_create.c (start_thread): Define pthread_start LIBC_PROBE.
2012-05-17 Andreas Jaeger <aj@suse.de>
* sysdeps/unix/sysv/linux/i386/i686/dl-sysdep.h

4
nptl/pthread_create.c
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@ -31,6 +31,8 @@
#include <shlib-compat.h>
#include <stap-probe.h>
/* Local function to start thread and handle cleanup. */
static int start_thread (void *arg);
@ -299,6 +301,8 @@ start_thread (void *arg)
CANCEL_RESET (oldtype);
}
LIBC_PROBE (pthread_start, 3, (pthread_t) pd, pd->start_routine, pd->arg);
/* Run the code the user provided. */
#ifdef CALL_THREAD_FCT
THREAD_SETMEM (pd, result, CALL_THREAD_FCT (pd));