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authorEric Andersen <andersen@codepoet.org>2004-08-21 21:39:51 +0000
committerEric Andersen <andersen@codepoet.org>2004-08-21 21:39:51 +0000
commit09f85c7ffd5f5f931c7c5d6b58d56109175f24c9 (patch)
tree2f225a2e4e694866d4c72a9b5df06134bbdc2994
parent6e112da93a731085ff9b07f0804395bb3866925a (diff)
Attempt to support 'gcc -finstrument-functions', which seems much
more sane than 'gcc -pg' and seems much easier to support. -Erik
-rw-r--r--libc/sysdeps/linux/common/Makefile3
-rw-r--r--libc/sysdeps/linux/common/noophooks.c26
-rw-r--r--libc/sysdeps/linux/common/pcprofile.c91
3 files changed, 120 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/Makefile b/libc/sysdeps/linux/common/Makefile
index 1930351fb..5e40870a2 100644
--- a/libc/sysdeps/linux/common/Makefile
+++ b/libc/sysdeps/linux/common/Makefile
@@ -57,6 +57,9 @@ CSRC= __rt_sigtimedwait.c __socketcall.c __syscall_fcntl.c \
ifneq ($(strip $(EXCLUDE_BRK)),y)
CSRC+=sbrk.c
endif
+ifeq ($(strip $(UCLIBC_PROFILING)),y)
+CSRC+=noophooks.c pcprofile.c
+endif
ifeq ($(strip $(UCLIBC_PROPOLICE)),y)
CSRC+=ssp.c
endif
diff --git a/libc/sysdeps/linux/common/noophooks.c b/libc/sysdeps/linux/common/noophooks.c
new file mode 100644
index 000000000..65e9fdd15
--- /dev/null
+++ b/libc/sysdeps/linux/common/noophooks.c
@@ -0,0 +1,26 @@
+/* Noop hooks for the instrumenting functions.
+ Copyright (C) 1999, 2000 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 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <features.h>
+
+void __cyg_profile_func_enter (void *this_fn, void *call_site)
+{
+}
+strong_alias (__cyg_profile_func_enter, __cyg_profile_func_exit)
diff --git a/libc/sysdeps/linux/common/pcprofile.c b/libc/sysdeps/linux/common/pcprofile.c
new file mode 100644
index 000000000..d5a9601b4
--- /dev/null
+++ b/libc/sysdeps/linux/common/pcprofile.c
@@ -0,0 +1,91 @@
+/* Profile PC and write result to FIFO.
+ Copyright (C) 1999, 2000 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 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#define _GNU_SOURCE
+#include <features.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdint.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 | O_CREAT, 0666);
+
+ if (fd != -1)
+ {
+ uint32_t word;
+
+ active = 1;
+
+ /* Write a magic word which tells the reader about the byte
+ order and the size of the following entries. */
+ word = 0xdeb00000 | sizeof (void *);
+ if (TEMP_FAILURE_RETRY (write (fd, &word, 4)) != 4)
+ {
+ /* If even this fails we shouldn't try further. */
+ close (fd);
+ fd = -1;
+ active = 0;
+ }
+ }
+ }
+}
+
+
+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)