diff options
| -rw-r--r-- | ChangeLog | 10 | ||||
| -rw-r--r-- | config.h.in | 4 | ||||
| -rwxr-xr-x | configure | 48 | ||||
| -rw-r--r-- | configure.in | 24 | ||||
| -rw-r--r-- | elf/Makefile | 3 | ||||
| -rw-r--r-- | elf/rtld-Rules | 5 | ||||
| -rw-r--r-- | extra-lib.mk | 2 | ||||
| -rw-r--r-- | include/stap-probe.h | 80 | ||||
| -rw-r--r-- | nptl/ChangeLog | 4 | ||||
| -rw-r--r-- | nptl/pthread_create.c | 4 |
10 files changed, 179 insertions, 5 deletions
@@ -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] diff --git a/config.h.in b/config.h.in index 5495260..dd184b0 100644 --- a/config.h.in +++ b/config.h.in @@ -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 + /* */ @@ -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 $host_os diff --git a/configure.in b/configure.in index 38b55a6..1ae9ca4 100644 --- a/configure.in +++ b/configure.in @@ -252,6 +252,7 @@ else fi AC_SUBST(libc_cv_nss_crypt) + AC_ARG_ENABLE([obsolete-rpc], AC_HELP_STRING([--enable-obsolete-rpc], [build and install the obsolete RPC code for link-time usage]), @@ -263,6 +264,29 @@ if test "$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 diff --git a/elf/Makefile b/elf/Makefile index f6c6fb4..0c26ce5 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -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 $(modules-names))) diff --git a/elf/rtld-Rules b/elf/rtld-Rules index 6526aec..1e03332 100644 --- a/elf/rtld-Rules +++ b/elf/rtld-Rules @@ -1,7 +1,6 @@ # Subroutine makefile for compiling libc modules linked into dynamic linker. -# Copyright (C) 2002,2003,2005,2006,2008,2010,2011 -# Free Software Foundation, Inc. +# Copyright (C) 2002-2012 Free Software Foundation, Inc. # This file is part of the GNU C Library. # The GNU C Library is free software; you can redistribute it and/or @@ -130,6 +129,6 @@ ifdef rtld-depfiles endif # This here is the whole point of all the shenanigans. -rtld-CPPFLAGS := -DNOT_IN_libc=1 -DIS_IN_rtld=1 +rtld-CPPFLAGS := -DNOT_IN_libc=1 -DIS_IN_rtld=1 -DIN_LIB=rtld endif diff --git a/extra-lib.mk b/extra-lib.mk index f2a19b0..a2293c5 100644 --- a/extra-lib.mk +++ b/extra-lib.mk @@ -101,4 +101,4 @@ ifneq (,$(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) diff --git a/include/stap-probe.h b/include/stap-probe.h new file mode 100644 index 0000000..1051ad1 --- /dev/null +++ b/include/stap-probe.h @@ -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 */ diff --git a/nptl/ChangeLog b/nptl/ChangeLog index efeebca..ade0b18 100644 --- a/nptl/ChangeLog +++ b/nptl/ChangeLog @@ -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 diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index 3c1e479..c52ae11 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -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)); |