Update.

1998-12-27  Ulrich Drepper  <drepper@cygnus.com>

	* elf/dl-lookup.c (_dl_num_relocations): New variable.
	(do_lookup): Increment _dl_num_relocations for every call.
	* elf/rtld.c (print_statistics): New function.
	(_dl_debug_statistics): New variable.  Set when statistics are asked
	for.
	(rtld_total_time, relocate_time, load_time): New variables.  Used
	in print_statistics.
	(_dl_start): Record start and end time of startup.  Call
	print_statistics if needed.
	(dk_main): Record times for relocations and loading.
	(process_dl_debug): Recognize statistics.

	Low-level, low-overhead, high-precision timing funcationality.
	* sysdeps/generic/hp-timing.h: New file.
	* sysdeps/i386/i686/Makefile: New file.
	* sysdeps/i386/i686/hp-timing.h: New file.
	* sysdeps/i386/i686/hp-timing.c: New file.

	* sysdeps/i386/dl-machine.h (elf_machine_rel): Reverse order of OR
	clauses to avoid accessing global variables during rtld relocation.

	* sunrpc/rpc_main.c: Unify messages.

	* sysdeps/unix/sysv/linux/arm/Dist: Add ioperm.c and sys/io.h.

1 files changed, 160 insertions, 0 deletions

diff --git a/sysdeps/i386/i686/hp-timing.h b/sysdeps/i386/i686/hp-timing.h
new file mode 100644
index 0000000000..ffbeb277e5
--- /dev/null
+++ b/sysdeps/i386/i686/hp-timing.h
@@ -0,0 +1,160 @@
+/* High precision, low overhead timing functions.  i686 version.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   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.  */
+
+#ifndef _HP_TIMING_H
+#define _HP_TIMING_H	1
+
+#include <string.h>
+#include <sys/param.h>
+#include <stdio-common/_itoa.h>
+
+/* The macros defined here use the timestamp counter in i586 and up versions
+   of the x86 processors.  They provide a very accurate way to measure the
+   time with very little overhead.  The time values themself have no real
+   meaning, only differences are interesting.
+
+   This version is for the i686 processors.  The difference to the i586
+   version is that the timerstamp register is unconditionally used.  This is
+   not the case for the i586 version where we have to perform runtime test
+   whether the processor really has this capability.  We have to make this
+   distinction since the sysdeps/i386/i586 code is supposed to work on all
+   platforms while the i686 already contains i686-specific code.
+
+   The list of macros we need includes the following:
+
+   - HP_TIMING_AVAIL: test for availability.
+
+   - HP_TIMING_INLINE: this macro is non-zero if the functionality is not
+     implemented using function calls but instead uses some inlined code
+     which might simply consist of a few assembler instructions.  We have to
+     know this since we might want to use the macros here in places where we
+     cannot make function calls.
+
+   - hp_timing_t: This is the type for variables used to store the time
+     values.
+
+   - HP_TIMING_ZERO: clear `hp_timing_t' object.
+
+   - HP_TIMING_NOW: place timestamp for current time in variable given as
+     parameter.
+
+   - HP_TIMING_DIFF_INIT: do whatever is necessary to be able to use the
+     HP_TIMING_DIFF macro.
+
+   - HP_TIMING_DIFF: compute difference between two times and store it
+     in a third.  Source and destination might overlap.
+
+   - HP_TIMING_ACCUM: add time difference to another variable.  This might
+     be a bit more complicated to implement for some platforms as the
+     operation should be thread-safe and 64bit arithmetic on 32bit platforms
+     is not.
+
+   - HP_TIMING_ACCUM_NT: this is the variant for situations where we know
+     there are no threads involved.
+
+   - HP_TIMING_PRINT: write decimal representation of the timing value into
+     the given string.  This operation need not be inline even though
+     HP_TIMING_INLINE is specified.
+
+*/
+
+/* We always assume having the timestamp register.  */
+#define HP_TIMING_AVAIL		(1)
+
+/* We indeed have inlined functions.  */
+#define HP_TIMING_INLINE	(1)
+
+/* We use 64bit values for the times.  */
+typedef unsigned long long int hp_timing_t;
+
+/* Internal variabled used to store the overhead of the measurement
+   opcodes.  */
+extern hp_timing_t __libc_hp_timing_overhead;
+
+/* Set timestamp value to zero.  */
+#define HP_TIMING_ZERO(Var)	(Var) = (0)
+
+/* That's quite simple.  Use the `rdtsc' instruction.  Note that the value
+   might not be 100% accurate since there might be some more instructions
+   running in this moment.  This could be changed by using a barrier like
+   'cpuid' right before the `rdtsc' instruciton.  But we are not interested
+   in accurate clock cycles here so we don't do this.  */
+#define HP_TIMING_NOW(Var)	__asm__ __volatile__ ("rdtsc" : "=A" (Var))
+
+/* Use two 'rdtsc' instructions in a row to find out how long it takes.  */
+#define HP_TIMING_DIFF_INIT() \
+  do {									      \
+    int __cnt = 5;							      \
+    __libc_hp_timing_overhead = ~0ull;					      \
+    do									      \
+      {									      \
+	hp_timing_t __t1, __t2;						      \
+	HP_TIMING_NOW (__t1);						      \
+	HP_TIMING_NOW (__t2);						      \
+	if (__t2 - __t1 < __libc_hp_timing_overhead)			      \
+	  __libc_hp_timing_overhead = __t2 - __t1;			      \
+      }									      \
+    while (--__cnt > 0);						      \
+  } while (0)
+
+/* It's simple arithmetic for us.  */
+#define HP_TIMING_DIFF(Diff, Start, End)	(Diff) = ((End) - (Start))
+
+/* We have to jump through hoops to get this correctly implemented.  */
+#define HP_TIMING_ACCUM(Sum, Diff) \
+  do {									      \
+    char __not_done;							      \
+    hp_timing_t __oldval = (Sum);					      \
+    hp_timing_t __diff = (Diff) - __libc_hp_timing_overhead;		      \
+    do									      \
+      {									      \
+	hp_timing_t __newval = __oldval + __diff;			      \
+	int __temp0, __temp1;						      \
+	__asm__ __volatile__ ("xchgl %4, %%ebx\n\t"			      \
+			      "lock; cmpxchg8b %1\n\t"			      \
+			      "sete %0\n\t"				      \
+			      "movl %4, %%ebx"				      \
+			      : "=q" (__not_done), "=m" (Sum),		      \
+				"=A" (__oldval), "=c" (__temp0),	      \
+				"=SD" (__temp1)				      \
+			      : "1" (Sum), "2" (__oldval),		      \
+				"3" (__newval >> 32),			      \
+				"4" (__newval & 0xffffffff)		      \
+			      : "memory");				      \
+      }									      \
+    while (__not_done);							      \
+  } while (0)
+
+/* No threads, no extra work.  */
+#define HP_TIMING_ACCUM_NT(Sum, Diff)	(Sum) += (Diff)
+
+/* Print the time value.  */
+#define HP_TIMING_PRINT(Buf, Len, Val) \
+  do {									      \
+    char __buf[20];							      \
+    char *__cp = _itoa (Val, __buf + sizeof (__buf), 10, 0);		      \
+    int __len = (Len);							      \
+    char *__dest = (Buf);						      \
+    while (__len-- > 0 && __cp < __buf + sizeof (__buf))		      \
+      *__dest++ = *__cp++;						      \
+    memcpy (__dest, " clock cycles", MIN (__len, sizeof (" clock cycles")));  \
+  } while (0)
+
+#endif	/* hp-timing.h */