[PATCH] glibc vDSO bits for ppc/ppc64 update
Tom Gall
tom_gall at vnet.ibm.com
Sat Nov 12 09:11:00 EST 2005
Greetings,
Enclosed is the next revision of the glibc vDSO implementation for
ppc/ppc64 that goes hand in hand with benh's vDSO kernel work currently
available at http://gate.crashing.org/~benh/ppc64-vdso-update.diff.
Implemented are:
__vdso_gettimeofdate
__vdso_clock_gettime
__vdso_clock_getres
__vdso_get_tbfreq
New to this patch as compared to the last posting is a rework for
symbol lookup to use _dl_vdso_weakref which as a nice side effect
when vdso symbols aren't found anoying error messages are no longer
printed.
Additional hp_timer_t is now declared as unsigned long long int
to match up with benh's get_tbfreq on 32 bit ppc. (ppc64 is already
64 bit)
Appreciate comments, questions and suggestions!
2005-11-11 Steven Munroe <sjmunroe at us.ibm.com>
Tom Gall <tom_gall at vnet.ibm.com>
* elf/rtld.c (dl_main): Initialize l_local_scope for sysinfo_map.
* sysdeps/powerpc/elf/libc-start.c: Move this.
* sysdeps/unix/sysv/linux/powerpc/libc-start.c: To here.
* sysdeps/powerpc/Versions: add __vdso_get_tbfreq symbol
* sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h: New file.
* sysdeps/unix/sysv/linux/powerpc/clock_getres.c: New file.
* sysdeps/unix/sysv/linux/powerpc/clock_gettime.c: New file.
* sysdeps/unix/sysv/linux/powerpc/dl-vdso.c: New file.
* sysdeps/unix/sysv/linux/powerpc/dl-vdso.h: New file.
* sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c: use vDSO / format
* sysdeps/unix/sysv/linux/powerpc/gettimeofday.c: New file.
* sysdeps/unix/sysv/linux/powerpc/Makefile: Add routines += dl-vdso.
* sysdeps/powerpc/powerpc32/hp-timing.h: New file.
diff -uNr libc/elf/rtld.c libc-41-32/elf/rtld.c
--- libc/elf/rtld.c 2005-11-11 11:18:09.389605816 -0500
+++ libc-41-32/elf/rtld.c 2005-11-11 09:31:48.000000000 -0500
@@ -1296,6 +1296,13 @@
elf_get_dynamic_info (l, dyn_temp);
_dl_setup_hash (l);
l->l_relocated = 1;
+ /* Initialize l_local_scope to contain just this map. This allows
+ the use of dl_lookup_symbol_x to resolve symbols within the vdso.
+ So we create a single entry list pointing to l_real as its only
+ element */
+
+ l->l_local_scope[0]->r_nlist = 1;
+ l->l_local_scope[0]->r_list = &l->l_real;
/* Now that we have the info handy, use the DSO image's soname
so this object can be looked up by name. Note that we do not
diff -uNr libc/sysdeps/powerpc/elf/libc-start.c libc-41-32/sysdeps/powerpc/elf/libc-start.c
--- libc/sysdeps/powerpc/elf/libc-start.c 2005-11-11 11:18:20.366667224 -0500
+++ libc-41-32/sysdeps/powerpc/elf/libc-start.c 1969-12-31 19:00:00.000000000 -0500
@@ -1,99 +0,0 @@
-/* Copyright (C) 1998,2000,2001,2002,2003,2004 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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <ldsodefs.h>
-#include <bp-start.h>
-#include <bp-sym.h>
-
-extern int __cache_line_size;
-weak_extern (__cache_line_size)
-
-/* The main work is done in the generic function. */
-#define LIBC_START_MAIN generic_start_main
-#define LIBC_START_DISABLE_INLINE
-#define LIBC_START_MAIN_AUXVEC_ARG
-#define MAIN_AUXVEC_ARG
-#include <sysdeps/generic/libc-start.c>
-
-
-struct startup_info
-{
- void *__unbounded sda_base;
- int (*main) (int, char **, char **, void *);
- int (*init) (int, char **, char **, void *);
- void (*fini) (void);
-};
-
-
-int
-/* GKM FIXME: GCC: this should get __BP_ prefix by virtue of the
- BPs in the arglist of startup_info.main and startup_info.init. */
-BP_SYM (__libc_start_main) (int argc, char *__unbounded *__unbounded ubp_av,
- char *__unbounded *__unbounded ubp_ev,
- ElfW(auxv_t) *__unbounded auxvec,
- void (*rtld_fini) (void),
- struct startup_info *__unbounded stinfo,
- char *__unbounded *__unbounded stack_on_entry)
-{
-#if __BOUNDED_POINTERS__
- char **argv;
-#else
-# define argv ubp_av
-#endif
-
- /* the PPC SVR4 ABI says that the top thing on the stack will
- be a NULL pointer, so if not we assume that we're being called
- as a statically-linked program by Linux... */
- if (*stack_on_entry != NULL)
- {
- char *__unbounded *__unbounded temp;
- /* ...in which case, we have argc as the top thing on the
- stack, followed by argv (NULL-terminated), envp (likewise),
- and the auxilary vector. */
- /* 32/64-bit agnostic load from stack */
- argc = *(long int *__unbounded) stack_on_entry;
- ubp_av = stack_on_entry + 1;
- ubp_ev = ubp_av + argc + 1;
-#ifdef HAVE_AUX_VECTOR
- temp = ubp_ev;
- while (*temp != NULL)
- ++temp;
- auxvec = (ElfW(auxv_t) *)++temp;
-#endif
- rtld_fini = NULL;
- }
-
- /* Initialize the __cache_line_size variable from the aux vector. */
- for (ElfW(auxv_t) *av = auxvec; av->a_type != AT_NULL; ++av)
- switch (av->a_type)
- {
- case AT_DCACHEBSIZE:
- {
- int *cls = & __cache_line_size;
- if (cls != NULL)
- *cls = av->a_un.a_val;
- }
- break;
- }
-
- return generic_start_main (stinfo->main, argc, ubp_av, auxvec,
- stinfo->init, stinfo->fini, rtld_fini,
- stack_on_entry);
-}
diff -uNr libc/sysdeps/powerpc/Versions libc-41-32/sysdeps/powerpc/Versions
--- libc/sysdeps/powerpc/Versions 2005-11-11 11:18:20.367667072 -0500
+++ libc-41-32/sysdeps/powerpc/Versions 2005-11-11 09:31:48.000000000 -0500
@@ -13,5 +13,6 @@
GLIBC_PRIVATE {
__novmx__libc_longjmp; __novmx__libc_siglongjmp;
__vmx__libc_longjmp; __vmx__libc_siglongjmp;
+ __vdso_get_tbfreq;
}
}
diff -uNr libc/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h libc-41-32/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h
--- libc/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h 1969-12-31 19:00:00.000000000 -0500
+++ libc-41-32/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h 2005-11-11 09:31:48.000000000 -0500
@@ -0,0 +1,36 @@
+/* Resolved function pointers to VDSO functions.
+ Copyright (C) 2005 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+
+#ifndef _LIBC_VDSO_H
+#define _LIBC_VDSO_H
+
+#ifdef SHARED
+
+typedef int (* __vdso_gettimeofday_t)(void *, void *);
+
+typedef int (* __vdso_clock_gettime_t)(clockid_t, struct timespec *);
+
+typedef int (* __vdso_clock_getres_t)(struct timeval*, void*);
+
+typedef hp_timing_t (* __vdso_get_tbfreq_t)(void);
+
+#endif
+
+#endif /* _LIBC_VDSO_H */
diff -uNr libc/sysdeps/unix/sysv/linux/powerpc/clock_getres.c libc-41-32/sysdeps/unix/sysv/linux/powerpc/clock_getres.c
--- libc/sysdeps/unix/sysv/linux/powerpc/clock_getres.c 1969-12-31 19:00:00.000000000 -0500
+++ libc-41-32/sysdeps/unix/sysv/linux/powerpc/clock_getres.c 2005-11-11 09:31:48.000000000 -0500
@@ -0,0 +1,197 @@
+/* clock_getres -- Get the resolution of a POSIX clockid_t. Linux version.
+ Copyright (C) 2003, 2004 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <sysdep.h>
+#include <errno.h>
+#include <time.h>
+#include <sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h>
+#include <sysdeps/unix/sysv/linux/kernel-features.h>
+
+#undef __clock_getres
+#include <bits/libc-vdso.h>
+
+
+#define SYSCALL_GETRES_MONOTONIC \
+#ifdef SHARED \
+ if (__vdso_clock_getres== NULL)\
+ retval = INLINE_SYSCALL (clock_getres, 2, clock_id, res); \
+ else \
+ return (__vdso_clock_getres) (clock_id, tp); \
+ break
+
+#define SYSCALL_GETRES_REALTIME \
+ retval = INLINE_SYSCALL (clock_getres, 2, clock_id, res); \
+ break
+
+#ifdef __ASSUME_POSIX_TIMERS
+
+/* This means the REALTIME and MONOTONIC clock are definitely
+ supported in the kernel. */
+# define SYSDEP_GETRES \
+ SYSDEP_GETRES_CPUTIME \
+ case CLOCK_REALTIME: \
+ SYSCALL_GETRES_REALTIME \
+ case CLOCK_MONOTONIC: \
+ SYSCALL_GETRES_MONOTONIC
+
+# define __libc_missing_posix_timers 0
+#elif defined __NR_clock_getres
+/* Is the syscall known to exist? */
+extern int __libc_missing_posix_timers attribute_hidden;
+
+static inline int
+maybe_syscall_getres (clockid_t clock_id, struct timespec *res)
+{
+ int e = EINVAL;
+
+ if (!__libc_missing_posix_timers)
+ {
+ INTERNAL_SYSCALL_DECL (err);
+ int r = INTERNAL_SYSCALL (clock_getres, err, 2, clock_id, res);
+ if (!INTERNAL_SYSCALL_ERROR_P (r, err))
+ return 0;
+
+ e = INTERNAL_SYSCALL_ERRNO (r, err);
+ if (e == ENOSYS)
+ {
+ __libc_missing_posix_timers = 1;
+ e = EINVAL;
+ }
+ }
+
+ return e;
+}
+
+/* The REALTIME and MONOTONIC clock might be available. Try the
+ syscall first. */
+# define SYSDEP_GETRES \
+ SYSDEP_GETRES_CPUTIME \
+ case CLOCK_REALTIME: \
+ case CLOCK_MONOTONIC: \
+ retval = maybe_syscall_getres (clock_id, res); \
+ if (retval == 0) \
+ break; \
+ /* Fallback code. */ \
+ if (retval == EINVAL && clock_id == CLOCK_REALTIME) \
+ retval = realtime_getres (res); \
+ else \
+ { \
+ __set_errno (retval); \
+ retval = -1; \
+ } \
+ break;
+#endif
+
+#ifdef __NR_clock_getres
+/* We handled the REALTIME clock here. */
+# define HANDLED_REALTIME 1
+# define HANDLED_CPUTIME 1
+
+# if __ASSUME_POSIX_CPU_TIMERS > 0
+
+# define SYSDEP_GETRES_CPU SYSCALL_GETRES
+# define SYSDEP_GETRES_CPUTIME /* Default catches them too. */
+
+# else
+
+extern int __libc_missing_posix_cpu_timers attribute_hidden;
+
+static int
+maybe_syscall_getres_cpu (clockid_t clock_id, struct timespec *res)
+{
+ int e = EINVAL;
+
+ if (!__libc_missing_posix_cpu_timers)
+ {
+ INTERNAL_SYSCALL_DECL (err);
+ int r = INTERNAL_SYSCALL (clock_getres, err, 2, clock_id, res);
+ if (!INTERNAL_SYSCALL_ERROR_P (r, err))
+ return 0;
+
+ e = INTERNAL_SYSCALL_ERRNO (r, err);
+# ifndef __ASSUME_POSIX_TIMERS
+ if (e == ENOSYS)
+ {
+ __libc_missing_posix_timers = 1;
+ __libc_missing_posix_cpu_timers = 1;
+ e = EINVAL;
+ }
+ else
+# endif
+ {
+ if (e == EINVAL)
+ {
+ /* Check whether the kernel supports CPU clocks at all.
+ If not, record it for the future. */
+ r = INTERNAL_SYSCALL (clock_getres, err, 2,
+ MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED),
+ NULL);
+ if (INTERNAL_SYSCALL_ERROR_P (r, err))
+ __libc_missing_posix_cpu_timers = 1;
+ }
+ }
+ }
+
+ return e;
+}
+
+# define SYSDEP_GETRES_CPU \
+ retval = maybe_syscall_getres_cpu (clock_id, res); \
+ if (retval == 0) \
+ break; \
+ if (retval != EINVAL || !__libc_missing_posix_cpu_timers) \
+ { \
+ __set_errno (retval); \
+ retval = -1; \
+ break; \
+ } \
+ retval = -1 /* Otherwise continue on to the HP_TIMING version. */;
+
+static inline int
+maybe_syscall_getres_cputime (clockid_t clock_id, struct timespec *res)
+{
+ return maybe_syscall_getres_cpu
+ (clock_id == CLOCK_THREAD_CPUTIME_ID
+ ? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED)
+ : MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED),
+ res);
+}
+
+# define SYSDEP_GETRES_CPUTIME \
+ case CLOCK_PROCESS_CPUTIME_ID: \
+ case CLOCK_THREAD_CPUTIME_ID: \
+ retval = maybe_syscall_getres_cputime (clock_id, res); \
+ if (retval == 0) \
+ break; \
+ if (retval != EINVAL || !__libc_missing_posix_cpu_timers) \
+ { \
+ __set_errno (retval); \
+ retval = -1; \
+ break; \
+ } \
+ retval = hp_timing_getres (res); \
+ break;
+# if !HP_TIMING_AVAIL
+# define hp_timing_getres(res) (__set_errno (EINVAL), -1)
+# endif
+
+# endif
+#endif
+
+#include <sysdeps/posix/clock_getres.c>
diff -uNr libc/sysdeps/unix/sysv/linux/powerpc/clock_gettime.c libc-41-32/sysdeps/unix/sysv/linux/powerpc/clock_gettime.c
--- libc/sysdeps/unix/sysv/linux/powerpc/clock_gettime.c 1969-12-31 19:00:00.000000000 -0500
+++ libc-41-32/sysdeps/unix/sysv/linux/powerpc/clock_gettime.c 2005-11-11 09:31:48.000000000 -0500
@@ -0,0 +1,196 @@
+/* clock_gettime -- Get current time from a POSIX clockid_t. Linux version.
+ Copyright (C) 2003, 2004 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <sysdep.h>
+#include <errno.h>
+#include <time.h>
+#include <sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h>
+#include <sysdeps/unix/sysv/linux/kernel-features.h>
+
+#undef __clock_gettime
+#include <bits/libc-vdso.h>
+
+#define SYSCALL_GETTIME_CLOCK_MONOTONIC \
+#ifdef SHARED \
+ if (__vdso_clock_gettime== NULL) \
+ retval = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp); \
+ else \
+ return (__vdso_clock_gettime) (clock_id, tp); \
+ break
+
+#define SYSCALL_GETTIME_CLOCK_REALTIME \
+ retval = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp); \
+ break
+
+#ifdef __ASSUME_POSIX_TIMERS
+
+/* This means the REALTIME and MONOTONIC clock are definitely
+ supported in the kernel. */
+# define SYSDEP_GETTIME \
+ SYSDEP_GETTIME_CPUTIME \
+ case CLOCK_REALTIME: \
+ SYSCALL_GETTIME_CLOCK_REALTIME \
+ case CLOCK_MONOTONIC: \
+ SYSCALL_GETTIME_CLOCK_MONOTONIC
+
+# define __libc_missing_posix_timers 0
+#elif defined __NR_clock_gettime
+/* Is the syscall known to exist? */
+int __libc_missing_posix_timers attribute_hidden;
+
+static inline int
+maybe_syscall_gettime (clockid_t clock_id, struct timespec *tp)
+{
+ int e = EINVAL;
+
+ if (!__libc_missing_posix_timers)
+ {
+ INTERNAL_SYSCALL_DECL (err);
+ int r = INTERNAL_SYSCALL (clock_gettime, err, 2, clock_id, tp);
+ if (!INTERNAL_SYSCALL_ERROR_P (r, err))
+ return 0;
+
+ e = INTERNAL_SYSCALL_ERRNO (r, err);
+ if (e == ENOSYS)
+ {
+ __libc_missing_posix_timers = 1;
+ e = EINVAL;
+ }
+ }
+
+ return e;
+}
+
+/* The REALTIME and MONOTONIC clock might be available. Try the
+ syscall first. */
+# define SYSDEP_GETTIME \
+ SYSDEP_GETTIME_CPUTIME \
+ case CLOCK_REALTIME: \
+ case CLOCK_MONOTONIC: \
+ retval = maybe_syscall_gettime (clock_id, tp); \
+ if (retval == 0) \
+ break; \
+ /* Fallback code. */ \
+ if (retval == EINVAL && clock_id == CLOCK_REALTIME) \
+ retval = realtime_gettime (tp); \
+ else \
+ { \
+ __set_errno (retval); \
+ retval = -1; \
+ } \
+ break;
+#endif
+
+#ifdef __NR_clock_gettime
+/* We handled the REALTIME clock here. */
+# define HANDLED_REALTIME 1
+# define HANDLED_CPUTIME 1
+
+# if __ASSUME_POSIX_CPU_TIMERS > 0
+
+# define SYSDEP_GETTIME_CPU SYSCALL_GETTIME
+# define SYSDEP_GETTIME_CPUTIME /* Default catches them too. */
+
+# else
+
+int __libc_missing_posix_cpu_timers attribute_hidden;
+
+static int
+maybe_syscall_gettime_cpu (clockid_t clock_id, struct timespec *tp)
+{
+ int e = EINVAL;
+
+ if (!__libc_missing_posix_cpu_timers)
+ {
+ INTERNAL_SYSCALL_DECL (err);
+ int r = INTERNAL_SYSCALL (clock_gettime, err, 2, clock_id, tp);
+ if (!INTERNAL_SYSCALL_ERROR_P (r, err))
+ return 0;
+
+ e = INTERNAL_SYSCALL_ERRNO (r, err);
+# ifndef __ASSUME_POSIX_TIMERS
+ if (e == ENOSYS)
+ {
+ __libc_missing_posix_timers = 1;
+ __libc_missing_posix_cpu_timers = 1;
+ e = EINVAL;
+ }
+ else
+# endif
+ {
+ if (e == EINVAL)
+ {
+ /* Check whether the kernel supports CPU clocks at all.
+ If not, record it for the future. */
+ r = INTERNAL_SYSCALL (clock_getres, err, 2,
+ MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED),
+ NULL);
+ if (INTERNAL_SYSCALL_ERROR_P (r, err))
+ __libc_missing_posix_cpu_timers = 1;
+ }
+ }
+ }
+
+ return e;
+}
+
+# define SYSDEP_GETTIME_CPU \
+ retval = maybe_syscall_gettime_cpu (clock_id, tp); \
+ if (retval == 0) \
+ break; \
+ if (retval != EINVAL || !__libc_missing_posix_cpu_timers) \
+ { \
+ __set_errno (retval); \
+ retval = -1; \
+ break; \
+ } \
+ retval = -1 /* Otherwise continue on to the HP_TIMING version. */;
+
+static inline int
+maybe_syscall_gettime_cputime (clockid_t clock_id, struct timespec *tp)
+{
+ return maybe_syscall_gettime_cpu
+ (clock_id == CLOCK_THREAD_CPUTIME_ID
+ ? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED)
+ : MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED),
+ tp);
+}
+
+# define SYSDEP_GETTIME_CPUTIME \
+ case CLOCK_PROCESS_CPUTIME_ID: \
+ case CLOCK_THREAD_CPUTIME_ID: \
+ retval = maybe_syscall_gettime_cputime (clock_id, tp); \
+ if (retval == 0) \
+ break; \
+ if (retval != EINVAL || !__libc_missing_posix_cpu_timers) \
+ { \
+ __set_errno (retval); \
+ retval = -1; \
+ break; \
+ } \
+ retval = hp_timing_gettime (clock_id, tp); \
+ break;
+# if !HP_TIMING_AVAIL
+# define hp_timing_gettime(clock_id, tp) (__set_errno (EINVAL), -1)
+# endif
+
+# endif
+#endif
+
+#include <sysdeps/unix/clock_gettime.c>
diff -uNr libc/sysdeps/unix/sysv/linux/powerpc/dl-vdso.c libc-41-32/sysdeps/unix/sysv/linux/powerpc/dl-vdso.c
--- libc/sysdeps/unix/sysv/linux/powerpc/dl-vdso.c 1969-12-31 19:00:00.000000000 -0500
+++ libc-41-32/sysdeps/unix/sysv/linux/powerpc/dl-vdso.c 2005-11-11 11:09:33.054571056 -0500
@@ -0,0 +1,128 @@
+/* VDSO symbol handling in the ELF dynamic linker.
+ Copyright (C) 2005 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include "config.h"
+#include <dl-hash.h>
+#include <ldsodefs.h>
+
+/* This function attempts to resolve a symbol in the VDSO map but
+ simply returns NULL if it is not there. This is intended for the
+ syscall replacement case where the runtime can fail-safe back to
+ the syscall. For example if we are running on an older kernel
+ that does not implement the specific function yet. */
+
+void *internal_function
+_dl_vdso_weakref (const char *name)
+{
+ const ElfW (Sym) * ref = NULL;
+ struct link_map *map = GLRO (dl_sysinfo_map);
+ void *value = NULL;
+ lookup_t result;
+
+ if (map != NULL)
+ {
+ /* This is a tricky because by default _dl_lookup_symbol_x will fail
+ and exit if the symbol is not found. Specifying a "skip_map" is
+ one case where _dl_loopup_symbol_x will do what we want, but the
+ l_local_scope in the dl_sysinfo_map will not to give the desired
+ result. So we create a dummy scope and link-map struct to be
+ the "skip_map". As the dummy.l_real points back to the real VDSO
+ map, do_lookup_x can find the symbol if it is there. */
+ struct r_scope_elem *symbol_scope[2];
+ struct link_map *scope_list[2];
+ struct r_scope_elem dummy_scope;
+ struct link_map dummy;
+
+ symbol_scope[0] = &dummy_scope;
+ symbol_scope[1] = NULL;
+ symbol_scope[0]->r_nlist = 2;
+ symbol_scope[0]->r_list = &scope_list[0];
+ scope_list[0] = map->l_local_scope[0]->r_list[0];
+ scope_list[1] = &dummy;
+ dummy.l_real = map->l_real;
+
+ /* Search the scope of the given vdso map. */
+ result = GLRO (dl_lookup_symbol_x) (name, map, &ref,
+ symbol_scope, NULL, 0, 0, &dummy);
+
+ if (ref != NULL)
+ {
+ value = DL_SYMBOL_ADDRESS (result, ref);
+ }
+ }
+
+ return value;
+}
+
+
+void *internal_function
+_dl_vdso_sym (const char *name)
+{
+ const ElfW (Sym) * ref = NULL;
+ struct link_map *map = GLRO (dl_sysinfo_map);
+ void *value = NULL;
+ lookup_t result;
+
+ if (map != NULL)
+ {
+ /* Search the scope of the given vdso map. */
+ result = GLRO (dl_lookup_symbol_x) (name, map, &ref,
+ map->l_local_scope,
+ NULL, 0, 0, NULL);
+
+ if (ref != NULL)
+ {
+ value = DL_SYMBOL_ADDRESS (result, ref);
+ }
+ }
+
+ return value;
+}
+
+void *internal_function
+_dl_vdso_vsym (const char *name, const char *version)
+{
+ const ElfW (Sym) * ref = NULL;
+ struct link_map *map = GLRO (dl_sysinfo_map);
+ void *value = NULL;
+ struct r_found_version vers;
+ lookup_t result;
+
+ if (map != NULL)
+ {
+ /* Compute hash value to the version string. */
+ vers.name = version;
+ vers.hidden = 1;
+ vers.hash = _dl_elf_hash (version);
+ /* We don't have a specific file where the symbol can be found. */
+ vers.filename = NULL;
+
+ /* Search the scope of the vdso map. */
+ result = GLRO (dl_lookup_symbol_x) (name, map, &ref,
+ map->l_local_scope,
+ &vers, 0, 0, NULL);
+
+ if (ref != NULL)
+ {
+ value = DL_SYMBOL_ADDRESS (result, ref);
+
+ }
+ }
+ return value;
+}
diff -uNr libc/sysdeps/unix/sysv/linux/powerpc/dl-vdso.h libc-41-32/sysdeps/unix/sysv/linux/powerpc/dl-vdso.h
--- libc/sysdeps/unix/sysv/linux/powerpc/dl-vdso.h 1969-12-31 19:00:00.000000000 -0500
+++ libc-41-32/sysdeps/unix/sysv/linux/powerpc/dl-vdso.h 2005-11-11 09:31:48.000000000 -0500
@@ -0,0 +1,33 @@
+/* Run-time dynamic linker data structures for loaded ELF shared objects.
+ Copyright (C) 2005 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _DL_VDSO_H
+#define _DL_VDSO_H
+
+/* Functions for resolving symbols in the VDSO link map. */
+ extern void *_dl_vdso_weakref (const char *name)
+ internal_function attribute_hidden;
+
+ extern void *_dl_vdso_sym (const char *name)
+ internal_function attribute_hidden;
+
+ extern void *_dl_vdso_vsym (const char *name, const char *version)
+ internal_function attribute_hidden;
+
+#endif /* ldsodefs.h */
diff -uNr libc/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c libc-41-32/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
--- libc/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c 2005-11-11 11:18:22.804563648 -0500
+++ libc-41-32/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c 2005-11-11 09:31:48.000000000 -0500
@@ -22,7 +22,11 @@
#include <string.h>
#include <unistd.h>
#include <libc-internal.h>
+#include <bits/libc-vdso.h>
+#ifdef SHARED
+extern __vdso_get_tbfreq_t __vdso_get_tbfreq;
+#endif
hp_timing_t
__get_clockfreq (void)
@@ -38,68 +42,78 @@
if (timebase_freq != 0)
return timebase_freq;
- int fd = open ("/proc/cpuinfo", O_RDONLY);
- if (__builtin_expect (fd != -1, 1))
+ /* if we can use the vDSO to obtain the timebase even better */
+#ifdef SHARED
+ if (__vdso_get_tbfreq != NULL)
{
- /* The timebase will be in the 1st 1024 bytes for systems with up
- to 8 processors. If the first read returns less then 1024
- bytes read, we have the whole cpuinfo and can start the scan.
- Otherwise we will have to read more to insure we have the
- timebase value in the scan. */
- char buf[1024];
- ssize_t n;
-
- n = read (fd, buf, sizeof (buf));
- if (n == sizeof (buf))
- {
- /* We are here because the 1st read returned exactly sizeof
- (buf) bytes. This implies that we are not at EOF and may
- not have read the timebase value yet. So we need to read
- more bytes until we know we have EOF. We copy the lower
- half of buf to the upper half and read sizeof (buf)/2
- bytes into the lower half of buf and repeat until we
- reach EOF. We can assume that the timebase will be in
- the last 512 bytes of cpuinfo, so two 512 byte half_bufs
- will be sufficient to contain the timebase and will
- handle the case where the timebase spans the half_buf
- boundry. */
- const ssize_t half_buf = sizeof (buf) / 2;
- while (n >= half_buf)
- {
- memcpy (buf, buf + half_buf, half_buf);
- n = read (fd, buf + half_buf, half_buf);
- }
- if (n >= 0)
- n += half_buf;
- }
-
- if (__builtin_expect (n, 1) > 0)
- {
- char *mhz = memmem (buf, n, "timebase", 7);
-
- if (__builtin_expect (mhz != NULL, 1))
- {
- char *endp = buf + n;
-
- /* Search for the beginning of the string. */
- while (mhz < endp && (*mhz < '0' || *mhz > '9') && *mhz != '\n')
- ++mhz;
-
- while (mhz < endp && *mhz != '\n')
- {
- if (*mhz >= '0' && *mhz <= '9')
- {
- result *= 10;
- result += *mhz - '0';
- }
+ timebase_freq=(__vdso_get_tbfreq)();
+ }
+ else
+#endif
+ {
+ int fd = open ("/proc/cpuinfo", O_RDONLY);
+ if (__builtin_expect (fd != -1, 1))
+ {
+ /* The timebase will be in the 1st 1024 bytes for systems with up
+ to 8 processors. If the first read returns less then 1024
+ bytes read, we have the whole cpuinfo and can start the scan.
+ Otherwise we will have to read more to insure we have the
+ timebase value in the scan. */
+ char buf[1024];
+ ssize_t n;
+
+ n = read (fd, buf, sizeof (buf));
+ if (n == sizeof (buf))
+ {
+ /* We are here because the 1st read returned exactly sizeof
+ (buf) bytes. This implies that we are not at EOF and may
+ not have read the timebase value yet. So we need to read
+ more bytes until we know we have EOF. We copy the lower
+ half of buf to the upper half and read sizeof (buf)/2
+ bytes into the lower half of buf and repeat until we
+ reach EOF. We can assume that the timebase will be in
+ the last 512 bytes of cpuinfo, so two 512 byte half_bufs
+ will be sufficient to contain the timebase and will
+ handle the case where the timebase spans the half_buf
+ boundry. */
+ const ssize_t half_buf = sizeof (buf) / 2;
+ while (n >= half_buf)
+ {
+ memcpy (buf, buf + half_buf, half_buf);
+ n = read (fd, buf + half_buf, half_buf);
+ }
+ if (n >= 0)
+ n += half_buf;
+ }
+
+ if (__builtin_expect (n, 1) > 0)
+ {
+ char *mhz = memmem (buf, n, "timebase", 7);
+
+ if (__builtin_expect (mhz != NULL, 1))
+ {
+ char *endp = buf + n;
+
+ /* Search for the beginning of the string. */
+ while (mhz < endp && (*mhz < '0' || *mhz > '9') && *mhz != '\n')
++mhz;
- }
- }
- timebase_freq = result;
- }
- close (fd);
- }
+ while (mhz < endp && *mhz != '\n')
+ {
+ if (*mhz >= '0' && *mhz <= '9')
+ {
+ result *= 10;
+ result += *mhz - '0';
+ }
+
+ ++mhz;
+ }
+ }
+ timebase_freq = result;
+ }
+ close (fd);
+ }
+ }
return timebase_freq;
}
diff -uNr libc/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c libc-41-32/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
--- libc/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c 1969-12-31 19:00:00.000000000 -0500
+++ libc-41-32/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c 2005-11-11 09:31:48.000000000 -0500
@@ -0,0 +1,54 @@
+/* Copyright (C) 2005 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <sysdep.h>
+#include <bp-checks.h>
+#include <stddef.h>
+#include <sys/time.h>
+#include <time.h>
+#include <hp-timing.h>
+
+#undef __gettimeofday
+#include <bits/libc-vdso.h>
+
+/* Get the current time of day and timezone information,
+ putting it into *TV and *TZ. If TZ is NULL, *TZ is not filled.
+ Returns 0 on success, -1 on errors. */
+
+#ifdef SHARED
+extern __vdso_gettimeofday_t __vdso_gettimeofday;
+#endif
+
+int
+__gettimeofday (tv, tz)
+ struct timeval *tv;
+ struct timezone *tz;
+{
+#ifdef SHARED
+ if (__vdso_gettimeofday == NULL)
+#endif
+ return INLINE_SYSCALL (gettimeofday, 2, CHECK_1 (tv), CHECK_1 (tz));
+#ifdef SHARED
+ else
+ {
+ return (*__vdso_gettimeofday) (tv, tz);
+ }
+#endif
+}
+
+INTDEF (__gettimeofday) weak_alias (__gettimeofday, gettimeofday)
diff -uNr libc/sysdeps/unix/sysv/linux/powerpc/libc-start.c libc-41-32/sysdeps/unix/sysv/linux/powerpc/libc-start.c
--- libc/sysdeps/unix/sysv/linux/powerpc/libc-start.c 1969-12-31 19:00:00.000000000 -0500
+++ libc-41-32/sysdeps/unix/sysv/linux/powerpc/libc-start.c 2005-11-11 09:31:48.000000000 -0500
@@ -0,0 +1,201 @@
+/* Copyright (C) 1998,2000,2001,2002,2003,2004,2005 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <ldsodefs.h>
+#include <bp-start.h>
+#include <bp-sym.h>
+
+extern int __cache_line_size;
+weak_extern (__cache_line_size)
+/* The main work is done in the generic function. */
+#define LIBC_START_MAIN generic_start_main
+#define LIBC_START_DISABLE_INLINE
+#define LIBC_START_MAIN_AUXVEC_ARG
+#define MAIN_AUXVEC_ARG
+#define INIT_MAIN_ARGS
+#include <sysdeps/generic/libc-start.c>
+ struct startup_info
+ {
+ void *__unbounded sda_base;
+ int (*main) (int, char **, char **, void *);
+ int (*init) (int, char **, char **, void *);
+ void (*fini) (void);
+ };
+
+
+#ifdef SHARED
+#include <sys/time.h>
+#include <dl-vdso.h>
+#undef __gettimeofday
+#undef __clock_gettime
+#undef __clock_getres
+#include <bits/libc-vdso.h>
+
+ __vdso_gettimeofday_t __vdso_gettimeofday;
+ __vdso_clock_gettime_t __vdso_clock_gettime;
+ __vdso_clock_getres_t __vdso_clock_getres;
+ __vdso_get_tbfreq_t __vdso_get_tbfreq;
+
+#if __WORDSIZE == 64
+ typedef struct
+ {
+ void *func;
+ void *toc_ptr;
+ void *extra;
+ } _ppc_func_desciptor;
+
+ static struct
+ {
+ _ppc_func_desciptor fd_gettimeofday;
+ _ppc_func_desciptor fd_clock_gettime;
+ _ppc_func_desciptor fd_clock_getres;
+ _ppc_func_desciptor fd_get_tbfreq;
+ } __vdso_descriptor;
+#endif
+
+ static inline void _libc_vdso_platform_setup (void)
+{
+ void *vdso_ref = NULL;
+
+ __vdso_gettimeofday = NULL;
+ __vdso_clock_gettime = NULL;
+ __vdso_clock_getres = NULL;
+ __vdso_get_tbfreq = NULL;
+
+ vdso_ref = _dl_vdso_weakref ("__kernel_gettimeofday");
+
+#if __WORDSIZE == 64
+ if (vdso_ref != NULL)
+ {
+ __vdso_descriptor.fd_gettimeofday.func = vdso_ref;
+ __vdso_descriptor.fd_gettimeofday.toc_ptr = NULL;
+ __vdso_descriptor.fd_gettimeofday.extra = NULL;
+ __vdso_gettimeofday = (__vdso_gettimeofday_t)
+ & __vdso_descriptor.fd_gettimeofday;
+ }
+#else
+ __vdso_gettimeofday = (__vdso_gettimeofday_t) vdso_ref;
+#endif
+
+ vdso_ref = _dl_vdso_weakref ("__kernel_clock_gettime");
+
+#if __WORDSIZE == 64
+ if (vdso_ref != NULL)
+ {
+ __vdso_descriptor.fd_clock_gettime.func = vdso_ref;
+ __vdso_descriptor.fd_clock_gettime.toc_ptr = NULL;
+ __vdso_descriptor.fd_clock_gettime.extra = NULL;
+ __vdso_clock_gettime = (__vdso_clock_gettime_t)
+ & __vdso_descriptor.fd_clock_gettime;
+ }
+#else
+ __vdso_clock_gettime = (__vdso_clock_gettime_t) vdso_ref;
+#endif
+
+ vdso_ref = _dl_vdso_weakref ("__kernel_clock_getres");
+
+#if __WORDSIZE == 64
+ if (vdso_ref != NULL)
+ {
+ __vdso_descriptor.fd_clock_getres.func = vdso_ref;
+ __vdso_descriptor.fd_clock_getres.toc_ptr = NULL;
+ __vdso_descriptor.fd_clock_getres.extra = NULL;
+ __vdso_clock_getres = (__vdso_clock_getres_t)
+ & __vdso_descriptor.fd_clock_getres;
+ }
+#else
+ __vdso_clock_getres = (__vdso_clock_getres_t) vdso_ref;
+#endif
+
+ vdso_ref = _dl_vdso_weakref ("__kernel_vdso_get_tbfreq");
+
+#if __WORDSIZE == 64
+ if (vdso_ref != NULL)
+ {
+ __vdso_descriptor.fd_clock_getres.func = vdso_ref;
+ __vdso_descriptor.fd_clock_getres.toc_ptr = NULL;
+ __vdso_descriptor.fd_clock_getres.extra = NULL;
+ __vdso_get_tbfreq = (__vdso_get_tbfreq_t)
+ & __vdso_descriptor.fd_get_tbfreq;
+ }
+#else
+ __vdso_get_tbfreq = (__vdso_get_tbfreq_t) vdso_ref;
+#endif
+}
+#endif
+
+int
+/* GKM FIXME: GCC: this should get __BP_ prefix by virtue of the
+ BPs in the arglist of startup_info.main and startup_info.init. */
+ BP_SYM (__libc_start_main) (int argc, char *__unbounded * __unbounded ubp_av,
+ char *__unbounded * __unbounded ubp_ev,
+ ElfW (auxv_t) * __unbounded auxvec,
+ void (*rtld_fini) (void),
+ struct startup_info * __unbounded stinfo,
+ char *__unbounded * __unbounded stack_on_entry)
+{
+#if __BOUNDED_POINTERS__
+ char **argv;
+#else
+# define argv ubp_av
+#endif
+
+ /* the PPC SVR4 ABI says that the top thing on the stack will
+ be a NULL pointer, so if not we assume that we're being called
+ as a statically-linked program by Linux... */
+ if (*stack_on_entry != NULL)
+ {
+ char *__unbounded * __unbounded temp;
+ /* ...in which case, we have argc as the top thing on the
+ stack, followed by argv (NULL-terminated), envp (likewise),
+ and the auxilary vector. */
+ /* 32/64-bit agnostic load from stack */
+ argc = *(long int *__unbounded) stack_on_entry;
+ ubp_av = stack_on_entry + 1;
+ ubp_ev = ubp_av + argc + 1;
+#ifdef HAVE_AUX_VECTOR
+ temp = ubp_ev;
+ while (*temp != NULL)
+ ++temp;
+ auxvec = (ElfW (auxv_t) *)++ temp;
+#endif
+ rtld_fini = NULL;
+ }
+
+ /* Initialize the __cache_line_size variable from the aux vector. */
+ for (ElfW (auxv_t) * av = auxvec; av->a_type != AT_NULL; ++av)
+ switch (av->a_type)
+ {
+ case AT_DCACHEBSIZE:
+ {
+ int *cls = &__cache_line_size;
+ if (cls != NULL)
+ *cls = av->a_un.a_val;
+ }
+ break;
+ }
+#ifdef SHARED
+ /* Resolve and initialize function pointers for VDSO functions. */
+ _libc_vdso_platform_setup ();
+#endif
+ return generic_start_main (stinfo->main, argc, ubp_av, auxvec,
+ stinfo->init, stinfo->fini, rtld_fini,
+ stack_on_entry);
+}
diff -uNr libc/sysdeps/unix/sysv/linux/powerpc/Makefile libc-41-32/sysdeps/unix/sysv/linux/powerpc/Makefile
--- libc/sysdeps/unix/sysv/linux/powerpc/Makefile 2005-11-11 11:18:22.776567904 -0500
+++ libc-41-32/sysdeps/unix/sysv/linux/powerpc/Makefile 2005-11-11 09:31:48.000000000 -0500
@@ -2,3 +2,8 @@
ifeq ($(subdir),rt)
librt-routines += rt-sysdep
endif
+
+ifeq ($(subdir),misc)
+routines += dl-vdso
+endif
+
--- /dev/null 2005-08-19 11:20:54.270914304 -0400
+++ libc-34-32/sysdeps/powerpc/powerpc32/hp-timing.h 2005-11-11 15:44:16.817619528 -0500
@@ -0,0 +1,83 @@
+/* High precision, low overhead timing functions. Generic version.
+ Copyright (C) 1998, 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper at cygnus.com>, 1998.
+
+ 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. */
+
+#ifndef _HP_TIMING_H
+#define _HP_TIMING_H 1
+
+
+/* There are no generic definitions for the times. We could write something
+ using the `gettimeofday' system call where available but the overhead of
+ the system call might be too high.
+
+ In case a platform supports timers in the hardware the following macros
+ and types must be defined:
+
+ - 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.
+
+*/
+
+/* Provide dummy definitions. */
+#define HP_TIMING_AVAIL (0)
+#define HP_TIMING_INLINE (0)
+typedef unsigned long long int hp_timing_t;
+#define HP_TIMING_ZERO(Var)
+#define HP_TIMING_NOW(var)
+#define HP_TIMING_DIFF_INIT()
+#define HP_TIMING_DIFF(Diff, Start, End)
+#define HP_TIMING_ACCUM(Sum, Diff)
+#define HP_TIMING_ACCUM_NT(Sum, Diff)
+#define HP_TIMING_PRINT(Buf, Len, Val)
+
+/* Since this implementation is not available we tell the user about it. */
+#define HP_TIMING_NONAVAIL 1
+
+#endif /* hp-timing.h */
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