Update.

2002-12-18  Ulrich Drepper  <drepper@redhat.com>

	* descr.h (struct pthread) [NEED_DL_SYSINFO]: Add sysinfo member.
	* sysdeps/i386/tls.h (tcbhead_t): Add sysinfo member.
	Define SYSINFO_OFFSEET if NEED_DL_SYSINFO is defined.
	(INIT_SYSINFO): New #define.
	(TLS_TP_INIT): Use INIT_SYSINFO.
	* sysdeps/unix/sysv/linux/libc_pthread_init.c (__libc_pthread_init):
	At test to make sure SYSINFO_OFFSET value is correct.
	* sysdeps/unix/sysv/linux/i386/dl-sysdep.h: New file.

3 files changed, 77 insertions, 0 deletions

diff --git a/nptl/sysdeps/i386/tls.h b/nptl/sysdeps/i386/tls.h
index 9f4b89f7aa..3d535be083 100644
--- a/nptl/sysdeps/i386/tls.h
+++ b/nptl/sysdeps/i386/tls.h
@@ -43,6 +43,7 @@ typedef struct
   void *self;		/* Pointer to the thread descriptor.  */
   list_t list;
   int multiple_threads;
+  uintptr_t sysinfo;
 } tcbhead_t;
 #endif
 
@@ -62,6 +63,11 @@ typedef struct
 /* Offset of the MULTIPLE_THREADS element in tcbhead_t.  */
 #define MULTIPLE_THREADS_OFFSET 20
 
+#ifdef NEED_DL_SYSINFO
+/* Offset of the SYSINFO element in tcbhead_t.  */
+# define SYSINFO_OFFSET 24
+#endif
+
 
 #ifndef __ASSEMBLER__
 /* Get system call information.  */
@@ -160,6 +166,13 @@ union user_desc_init
 #  define TLS_LOAD_EBX
 # endif
 
+#if defined NEED_DL_SYSINFO && defined SHARED
+# define INIT_SYSINFO \
+  _head->sysinfo = GL(dl_sysinfo)
+#else
+# define INIT_SYSINFO
+#endif
+
 /* Code to initially initialize the thread pointer.  This might need
    special attention since 'errno' is not yet available and if the
    operation can cause a failure 'errno' must not be touched.  */
@@ -172,6 +185,8 @@ union user_desc_init
      _head->tcb = _thrdescr;						      \
      /* For now the thread descriptor is at the same address.  */	      \
      _head->self = _thrdescr;						      \
+     /* New syscall handling support.  */				      \
+     INIT_SYSINFO;							      \
 									      \
      /* The 'entry_number' field.  Let the kernel pick a value.  */	      \
      if (secondcall)							      \
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/dl-sysdep.h b/nptl/sysdeps/unix/sysv/linux/i386/dl-sysdep.h
new file mode 100644
index 0000000000..0481fce185
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/i386/dl-sysdep.h
@@ -0,0 +1,53 @@
+/* System-specific settings for dynamic linker code.  Generic version.
+   Copyright (C) 2002 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_SYSDEP_H
+#define _DL_SYSDEP_H	1
+
+/* This macro must be defined to either 0 or 1.
+
+   If 1, then an errno global variable hidden in ld.so will work right with
+   all the errno-using libc code compiled for ld.so, and there is never a
+   need to share the errno location with libc.  This is appropriate only if
+   all the libc functions that ld.so uses are called without PLT and always
+   get the versions linked into ld.so rather than the libc ones.  */
+
+#define RTLD_PRIVATE_ERRNO 1
+
+
+/* Traditionally system calls have been made using int $0x80.  A
+   second method was introduced which, if possible, will use the
+   sysenter/syscall instructions.  To signal the presence and where to
+   find the code the kernel passes an AT_SYSINFO value in the
+   auxiliary vector to the application.  */
+#define NEED_DL_SYSINFO	1
+
+#if defined NEED_DL_SYSINFO && !defined __ASSEMBLER__
+extern void _dl_sysinfo_int80 (void) attribute_hidden;
+# define DL_SYSINFO_DEFAULT _dl_sysinfo_int80
+# define DL_SYSINFO_IMPLEMENTATION \
+  asm (".type _dl_sysinfo_int80,@function\n\t"				      \
+       ".hidden _dl_sysinfo_int80\n"					      \
+       "_dl_sysinfo_int80:\n\t"						      \
+       "int $0x80;\n\t"							      \
+       "ret;\n\t"							      \
+       ".size _dl_sysinfo_int80,.-_dl_sysinfo_int80");
+#endif
+
+#endif	/* dl-sysdep.h */
diff --git a/nptl/sysdeps/unix/sysv/linux/libc_pthread_init.c b/nptl/sysdeps/unix/sysv/linux/libc_pthread_init.c
index 7d91528aaf..87c97343b0 100644
--- a/nptl/sysdeps/unix/sysv/linux/libc_pthread_init.c
+++ b/nptl/sysdeps/unix/sysv/linux/libc_pthread_init.c
@@ -20,6 +20,7 @@
 #include <unistd.h>
 #include <list.h>
 #include "fork.h"
+#include <dl-sysdep.h>
 #include <tls.h>
 #include <string.h>
 #include <pthreadP.h>
@@ -62,4 +63,12 @@ __libc_pthread_init (ptr, reclaim, functions)
 		    str_n_len ("*** MULTIPLE_THREADS_OFFSET out of date\n"));
       _exit (1);
     }
+#ifdef SYSINFO_OFFSET
+  if (offsetof (struct pthread, header.data.sysinfo) != SYSINFO_OFFSET)
+    {
+      __libc_write (STDERR_FILENO,
+		    str_n_len ("*** SYSINFO_OFFSET out of date\n"));
+      _exit (1);
+    }
+#endif
 }