[PATCH roland/nptl-ia64] IA64: Consolidate NPTL/non versions of vfork

[Roland McGrath <roland at hack dot frob dot com>]

Not tested at all.  Based on rth's advice about the syntax and safety of a
tail call to PLT.


Thanks,
Roland


	* sysdeps/unix/sysv/linux/ia64/nptl/vfork.S: Moved ...
	* sysdeps/unix/sysv/linux/ia64/vfork.S: ... here.
	(__libc_vfork): Define function under this name.
	(__vfork): Define as an alias.
	* sysdeps/unix/sysv/linux/ia64/pt-vfork.S: New file.
	* sysdeps/unix/sysv/linux/ia64/nptl/pt-vfork.S: File removed.

diff --git a/sysdeps/unix/sysv/linux/ia64/nptl/pt-vfork.S b/sysdeps/unix/sysv/linux/ia64/nptl/pt-vfork.S
deleted file mode 100644
index 59b5b7a..0000000
--- a/sysdeps/unix/sysv/linux/ia64/nptl/pt-vfork.S
+++ /dev/null
@@ -1,59 +0,0 @@
-/* Copyright (C) 2000-2014 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, see
-   <http://www.gnu.org/licenses/>.  */
-
-
-#include <sysdep.h>
-#define _SIGNAL_H
-#include <bits/signum.h>
-#include <tcb-offsets.h>
-
-/* The following are defined in linux/sched.h, which unfortunately	*/
-/* is not safe for inclusion in an assembly file.			*/
-#define CLONE_VM        0x00000100      /* set if VM shared between processes */
-#define CLONE_VFORK     0x00004000      /* set if the parent wants the child to wake it up on mm_release */
-
-/* pid_t vfork(void); */
-/* Implemented as __clone_syscall(CLONE_VFORK | CLONE_VM | SIGCHLD, 0)	*/
-
-ENTRY(__vfork)
-	.prologue	// work around a GAS bug which triggers if
-	.body		// first .prologue is not at the beginning of proc.
-	alloc r2=ar.pfs,0,0,2,0
-	adds r14=PID,r13
-	;;
-	ld4 r16=[r14]
-	;;
-	sub r15=0,r16
-	mov out0=CLONE_VM+CLONE_VFORK+SIGCHLD
-	mov out1=0		/* Standard sp value.			*/
-	;;
-	st4 [r14]=r15
-	DO_CALL (SYS_ify (clone))
-	cmp.eq p0,p7=0,r8
-	adds r14=PID,r13
-	;;
-(p7)	ld4 r16=[r14]
-	cmp.eq p6,p0=-1,r10
-	;;
-(p7)	sub r15=0,r16
-	;;
-(p7)	st4 [r14]=r15
-(p6)	br.cond.spnt.few __syscall_error
-	ret
-PSEUDO_END(__vfork)
-
-weak_alias (__vfork, vfork)
diff --git a/sysdeps/unix/sysv/linux/ia64/nptl/vfork.S b/sysdeps/unix/sysv/linux/ia64/nptl/vfork.S
deleted file mode 100644
index f1ca305..0000000
--- a/sysdeps/unix/sysv/linux/ia64/nptl/vfork.S
+++ /dev/null
@@ -1,68 +0,0 @@
-/* Copyright (C) 2000-2014 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, see
-   <http://www.gnu.org/licenses/>.  */
-
-
-#include <sysdep.h>
-#define _SIGNAL_H
-#include <bits/signum.h>
-#include <tcb-offsets.h>
-
-/* The following are defined in linux/sched.h, which unfortunately	*/
-/* is not safe for inclusion in an assembly file.			*/
-#define CLONE_VM        0x00000100      /* set if VM shared between processes */
-#define CLONE_VFORK     0x00004000      /* set if the parent wants the child to wake it up on mm_release */
-
-/* pid_t vfork(void); */
-/* Implemented as __clone_syscall(CLONE_VFORK | CLONE_VM | SIGCHLD, 0)	*/
-
-ENTRY(__vfork)
-	.prologue	// work around a GAS bug which triggers if
-	.body		// first .prologue is not at the beginning of proc.
-	alloc r2=ar.pfs,0,0,2,0
-	adds r14=PID,r13
-	;;
-	ld4 r16=[r14]
-	;;
-	sub r15=0,r16
-	cmp.eq p6,p0=0,r16
-	;;
-(p6)	movl r15=0x80000000
-	mov out0=CLONE_VM+CLONE_VFORK+SIGCHLD
-	mov out1=0		/* Standard sp value.			*/
-	;;
-	st4 [r14]=r15
-	DO_CALL (SYS_ify (clone))
-	cmp.eq p6,p0=0,r8
-	adds r14=PID,r13
-(p6)	br.cond.dptk 1f
-	;;
-	ld4 r15=[r14]
-	;;
-	extr.u r16=r15,0,31
-	;;
-	cmp.eq p0,p6=0,r16
-	;;
-(p6)	sub r16=0,r15
-	;;
-	st4 [r14]=r16
-1:
-	cmp.eq p6,p0=-1,r10
-(p6)	br.cond.spnt.few __syscall_error
-	ret
-PSEUDO_END(__vfork)
-libc_hidden_def (__vfork)
-weak_alias (__vfork, vfork)
diff --git a/sysdeps/unix/sysv/linux/ia64/pt-vfork.S b/sysdeps/unix/sysv/linux/ia64/pt-vfork.S
new file mode 100644
index 0000000..2816e8d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/ia64/pt-vfork.S
@@ -0,0 +1,46 @@
+/* vfork ABI-compatibility entry points for libpthread.  IA64 version.
+   Copyright (C) 2014 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <shlib-compat.h>
+
+/* libpthread used to have its own vfork implementation that differed
+   from libc's only in having a pointless micro-optimization.  There
+   is no longer any use to having a separate copy in libpthread, but
+   the historical ABI requires it.  For static linking, there is no
+   need to provide anything here--the libc version will be linked in.
+   For shared library ABI compatibility, there must be __vfork and
+   vfork symbols in libpthread.so.  */
+
+#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
+     || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
+
+LOCAL_LEAF (vfork_compat)
+	br __libc_vfork
+	;;
+END (vfork_compat)
+
+#endif
+
+#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
+compat_symbol (libpthread, vfork_compat, vfork, GLIBC_2_0);
+#endif
+
+#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
+strong_alias (vfork_compat, __vfork_compat)
+compat_symbol (libpthread, __vfork_compat, __vfork, GLIBC_2_1_2);
+#endif
diff --git a/sysdeps/unix/sysv/linux/ia64/vfork.S b/sysdeps/unix/sysv/linux/ia64/vfork.S
index 0422104..ff2d22b 100644
--- a/sysdeps/unix/sysv/linux/ia64/vfork.S
+++ b/sysdeps/unix/sysv/linux/ia64/vfork.S
@@ -19,6 +19,7 @@
 #include <sysdep.h>
 #define _SIGNAL_H
 #include <bits/signum.h>
+#include <tcb-offsets.h>
 
 /* The following are defined in linux/sched.h, which unfortunately	*/
 /* is not safe for inclusion in an assembly file.			*/
@@ -28,16 +29,42 @@
 /* pid_t vfork(void); */
 /* Implemented as __clone_syscall(CLONE_VFORK | CLONE_VM | SIGCHLD, 0)	*/
 
-ENTRY(__vfork)
+ENTRY (__libc_vfork)
+	.prologue	// work around a GAS bug which triggers if
+	.body		// first .prologue is not at the beginning of proc.
 	alloc r2=ar.pfs,0,0,2,0
+	adds r14=PID,r13
+	;;
+	ld4 r16=[r14]
+	;;
+	sub r15=0,r16
+	cmp.eq p6,p0=0,r16
+	;;
+(p6)	movl r15=0x80000000
 	mov out0=CLONE_VM+CLONE_VFORK+SIGCHLD
 	mov out1=0		/* Standard sp value.			*/
 	;;
-	DO_CALL_VIA_BREAK (SYS_ify (clone))
+	st4 [r14]=r15
+	DO_CALL (SYS_ify (clone))
+	cmp.eq p6,p0=0,r8
+	adds r14=PID,r13
+(p6)	br.cond.dptk 1f
+	;;
+	ld4 r15=[r14]
+	;;
+	extr.u r16=r15,0,31
+	;;
+	cmp.eq p0,p6=0,r16
+	;;
+(p6)	sub r16=0,r15
+	;;
+	st4 [r14]=r16
+1:
 	cmp.eq p6,p0=-1,r10
 (p6)	br.cond.spnt.few __syscall_error
 	ret
-PSEUDO_END(__vfork)
-libc_hidden_def (__vfork)
+PSEUDO_END (__libc_vfork)
 
+strong_alias (__libc_vfork, __vfork)
+libc_hidden_def (__vfork)
 weak_alias (__vfork, vfork)