From 03a75825763563a80bb35d89688d8b0d451e11f2 Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Wed, 25 Oct 1995 02:19:39 +0000
Subject: * sysdeps/unix/sysv/linux/i386/sysdep.h (SYSCALL_ERROR_HANDLER):

	New macro.
	(PSEUDO): Use it instead of SYSCALL_PIC_SETUP and jmp syscall_error.

	* sysdeps/unix/sysv/linux/i386/sysdep.S (__syscall_error): Define
	only #ifndef PIC.

	* Makeconfig (built-program-cmd): New variable.
	* sunrpc/Makefile (rpcgen-cmd): Use $(built-program-cmd).
	* time/Makefile (zic-cmd): Likewise.

	* hurd/Makefile (user-interfaces): Add hurd/exec_startup.
---
 sysdeps/unix/configure                |  5 +++--
 sysdeps/unix/sysv/linux/i386/sysdep.S | 29 ++++++++++++++++++-----------
 sysdeps/unix/sysv/linux/i386/sysdep.h | 27 +++++++++++++++++++++------
 3 files changed, 42 insertions(+), 19 deletions(-)

(limited to 'sysdeps')

diff --git a/sysdeps/unix/configure b/sysdeps/unix/configure
index dfc1c22960..249a12907a 100755
--- a/sysdeps/unix/configure
+++ b/sysdeps/unix/configure
@@ -65,6 +65,7 @@ for unix_function in \
   getitimer setitimer \
   getdomainname/getdomain=bsd/bsd4.4 \
   setdomainname/setdomain=bsd/bsd4.4 \
+  fchdir=bsd/bsd4.4 \
   profil=bsd readv=bsd writev=bsd \
   getpriority setpriority \
   getrlimit setrlimit
@@ -76,8 +77,8 @@ do
   unix_srcname=
   unix_srcdir=common
   eval "unix_syscall=`echo $unix_function | \
-		       sed -e 's@=\(.*\)$@ unix_srcdir=\1@' \
-			   -e 's@/\(.*\)$@ unix_srcname=\1@'`"
+		      sed -e 's@=\(.*\)$@ unix_srcdir=\1@' \
+			  -e 's@/\(^=/*\)$@ unix_srcname=\1@'`"
   test -z "$unix_srcname" && unix_srcname=$unix_syscall
 
   unix_implementor=none
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.S b/sysdeps/unix/sysv/linux/i386/sysdep.S
index 5bbe3b745d..f5ac8aa017 100644
--- a/sysdeps/unix/sysv/linux/i386/sysdep.S
+++ b/sysdeps/unix/sysv/linux/i386/sysdep.S
@@ -16,17 +16,6 @@ License along with the GNU C Library; see the file COPYING.LIB.  If
 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
 Cambridge, MA 02139, USA.  */
 
-/* The syscall stubs jump here when they detect an error.
-   The code for Linux is almost identical to the canonical Unix/i386
-   code, except that the error number in %eax is negated.  */
-
-.globl __syscall_error
-__syscall_error:
-	negl %eax
-
-#define __syscall_error __syscall_error_1
-#include <sysdeps/unix/i386/sysdep.S>
-
 /* Because the Linux version is in fact i386/ELF and the start.? file
    for this system (sysdeps/i386/elf/start.S) is also used by The Hurd
    and therefore this files must not contain the definition of the
@@ -38,3 +27,21 @@ __syscall_error:
 	.globl errno
 errno:
 	.long 0
+
+/* The following code is not used at all in the shared library.
+   The PIC system call stubs set errno themselves.  */
+
+#ifndef	PIC
+
+/* The syscall stubs jump here when they detect an error.
+   The code for Linux is almost identical to the canonical Unix/i386
+   code, except that the error number in %eax is negated.  */
+
+.globl __syscall_error
+__syscall_error:
+	negl %eax
+
+#define __syscall_error __syscall_error_1
+#include <sysdeps/unix/i386/sysdep.S>
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h
index ccb484664f..7bd910e534 100644
--- a/sysdeps/unix/sysv/linux/i386/sysdep.h
+++ b/sysdeps/unix/sysv/linux/i386/sysdep.h
@@ -42,16 +42,31 @@ Cambridge, MA 02139, USA.  */
 #undef	PSEUDO
 #define	PSEUDO(name, syscall_name, args)				      \
   .text;								      \
- lose: SYSCALL_PIC_SETUP						      \
-    jmp JUMPTARGET (syscall_error)					      \
-  .globl syscall_error;							      \
+  SYSCALL_ERROR_HANDLER							      \
   ENTRY (name)								      \
     movl $SYS_ify (syscall_name), %eax;					      \
     DO_CALL (args);							      \
     testl %eax, %eax;							      \
-    jl lose
+    jl syscall_error;
 
-/* We define our own ENTRY macro because the alignment should be 16 for ELF.  */
+#ifndef	PIC
+#define SYSCALL_ERROR_HANDLER	/* Nothing here; code in sysdep.S is used.  */
+#else
+/* Store (- %eax) into errno through the GOT.  */
+#define SYSCALL_ERROR_HANDLER						      \
+syscall_error:								      \
+  call 0f;								      \
+0:popl %ecx;								      \
+  negl %eax;								      \
+  addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %ecx;				      \
+  movl errno@GOT(%ecx), %ecx;						      \
+  movl %eax, (%ecx);							      \
+  movl $-1, %eax;							      \
+  ret
+#endif
+
+/* We define our own ENTRY macro because the alignment should be 16 for
+   ELF.  */
 #undef ENTRY
 #define ENTRY(name)							      \
   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (name);				      \
@@ -81,7 +96,7 @@ Cambridge, MA 02139, USA.  */
    arguments 4 and 5.)
 
    The following code tries hard to be optimal.  A general assuption
-   (which is true accoriding to the data books I have) is that
+   (which is true according to the data books I have) is that
 
 	2 * xchg	is more expensive than	pushl + movl + popl
 
-- 
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