3 files changed, 106 insertions, 2 deletions
diff --git a/debug/Makefile b/debug/Makefile
index 9c094c4..d13be3d 100644
--- a/debug/Makefile
+++ b/debug/Makefile
@@ -24,18 +24,21 @@ subdir	:= debug
 headers	:= execinfo.h
 distribute = sigcontextinfo.h register-dump.h
 
-routines := backtrace backtracesyms backtracesymsfd
+routines := backtrace backtracesyms backtracesymsfd noophooks
 
 CFLAGS-backtrace.c = -fno-omit-frame-pointer
 
 tests = backtrace-tst
 
-extra-libs = libSegFault
+extra-libs = libSegFault libpcprofile
 extra-libs-others = $(extra-libs)
 
 libSegFault-routines = segfault
 libSegFault-inhibit-o = $(filter-out .os,$(object-suffixes))
 
+libpcprofile-routines = pcprofile
+libpcprofile-inhibit-o = $(filter-out .os,$(object-suffixes))
+
 include ../Makeconfig
 
 distribute += catchsegv.sh
@@ -58,3 +61,4 @@ $(objpfx)catchsegv: catchsegv.sh $(common-objpfx)soversions.mk \
 # This ensures they will load libc.so for needed symbols if loaded by
 # a statically-linked program that hasn't already loaded it.
 $(objpfx)libSegFault.so: $(common-objpfx)libc.so $(common-objpfx)elf/ld.so
+$(objpfx)libpcprofile.so: $(common-objpfx)libc.so $(common-objpfx)elf/ld.so
diff --git a/debug/noophooks.c b/debug/noophooks.c
new file mode 100644
index 0000000..5c1ae01
--- /dev/null
+++ b/debug/noophooks.c
@@ -0,0 +1,25 @@
+/* Noop hooks for the instrumenting functions.
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+void
+__cyg_profile_func_enter (void *this_fn, void *call_site)
+{
+}
+strong_alias (__cyg_profile_func_enter, __cyg_profile_func_exit)
diff --git a/debug/pcprofile.c b/debug/pcprofile.c
new file mode 100644
index 0000000..b5dc4e7
--- /dev/null
+++ b/debug/pcprofile.c
@@ -0,0 +1,75 @@
+/* Profile PC and write result to FIFO.
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/* Nonzero if we are actually doing something.  */
+static int active;
+
+/* The file descriptor of the FIFO.  */
+static int fd;
+
+
+static void
+__attribute__ ((constructor))
+install (void)
+{
+  /* See whether the environment variable `PCPROFILE_OUTPUT' is defined.
+     If yes, it should name a FIFO.  We open it and mark ourself as active.  */
+  const char *outfile = getenv ("PCPROFILE_OUTPUT");
+
+  if (outfile != NULL && *outfile != '\0')
+    {
+      fd = open (outfile, O_RDWR);
+
+      if (fd != -1)
+	active = 1;
+    }
+}
+
+
+static void
+__attribute__ ((destructor))
+uninstall (void)
+{
+  if (active)
+    close (fd);
+}
+
+
+void
+__cyg_profile_func_enter (void *this_fn, void *call_site)
+{
+  void *buf[2];
+
+  if (! active)
+    return;
+
+  /* Now write out the current position and that of the caller.  We do
+     this now, and don't cache the because we want real-time output.  */
+  buf[0] = this_fn;
+  buf[1] = call_site;
+
+  write (fd, buf, sizeof buf);
+}
+/* We don't handle entry and exit differently here.  */
+strong_alias (__cyg_profile_func_enter, __cyg_profile_func_exit)