__tfork() needs to set the stack address of the new thread in the kernel,

so that it can't get a signal while still running on the parent thread's
stack.  Also, pass in sizeof(struct __tfork) to provide forward compat
when more members are added.  This is an ABI change, so switch syscall
numbers and bump lib majors this time.

ok deraadt@ matthew@

15 files changed, 74 insertions, 127 deletions

diff --git a/lib/libc/arch/alpha/sys/tfork_thread.S b/lib/libc/arch/alpha/sys/tfork_thread.S
index 10fac103287..9b84cd0158a 100644
--- a/lib/libc/arch/alpha/sys/tfork_thread.S
+++ b/lib/libc/arch/alpha/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:55 guenther Exp $	*/
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $	*/
 
 /*
  * Copyright (c) 2005, Miodrag Vallat
@@ -28,10 +28,10 @@
 #include  "SYS.h"
 
 /*
- * int __tfork_thread(const struct __tfork *param, void *stack, void (*func)(void *), void *arg);
+ * int __tfork_thread(const struct __tfork *param, size_t psize, void (*func)(void *), void *arg);
  */
 LEAF(__tfork_thread,0)
-	/* a0 = flags, a1 = stack, a2 = func, a3 = arg */
+	/* a0 = flags, a1 = psize, a2 = func, a3 = arg */
 	mov	a3, a5
 	CALLSYS_ERROR(__tfork)
 
@@ -44,9 +44,8 @@ LEAF(__tfork_thread,0)
 
 1:
 	/*
-	 * In child process: switch stack, invoke function, then exit.
+	 * In child process: invoke function, then exit.
 	 */
-	mov	a1, sp		/* stack */
 	mov	a5, a0		/* arg */
 	mov	a2, pv		/* func */
 	jsr	ra, (pv)
diff --git a/lib/libc/arch/amd64/sys/tfork_thread.S b/lib/libc/arch/amd64/sys/tfork_thread.S
index 41a42d79972..9eb4f0631fe 100644
--- a/lib/libc/arch/amd64/sys/tfork_thread.S
+++ b/lib/libc/arch/amd64/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:55 guenther Exp $ */
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $ */
 /*-
  * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
  * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
@@ -38,11 +38,11 @@ __FBSDID("$FreeBSD: /repoman/r/ncvs/src/lib/libc/amd64/gen/rfork_thread.S,v 1.1
 #include "SYS.h"
 
 /*
- *                %rdi   %rsi        %rdx       %rcx
- * __tfork_thread(param, stack_addr, start_fnc, start_arg);
+ *                %rdi   %rsi   %rdx       %rcx
+ * __tfork_thread(param, psize, start_fnc, start_arg);
  *
  * param:		Argument to pass to the actual kernel call.
- * stack_addr:		Top of stack for thread.
+ * psize:		Other argument to pass to the actual kernel call.
  * start_fnc:		Address of thread function to call in child.
  * start_arg:		Argument to pass to the thread function in child.
  */
@@ -71,7 +71,6 @@ ENTRY(__tfork_thread)
 	 * returns, then call __threxit.
 	 */
 1:
-	movq	%rsi, %rsp
 	movq	%r9, %rdi
 	call	*%r8
 
diff --git a/lib/libc/arch/arm/sys/tfork_thread.S b/lib/libc/arch/arm/sys/tfork_thread.S
index 0ece8d15d2a..4115477f28d 100644
--- a/lib/libc/arch/arm/sys/tfork_thread.S
+++ b/lib/libc/arch/arm/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/* $OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:55 guenther Exp $ */
+/* $OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $ */
 /*
  * Copyright (c) 2005 Dale Rahn <drahn@openbsd.org>
  *
@@ -19,30 +19,23 @@
 #include "SYS.h"
 
 /*
- *                r0     r1          r2         r3
- * __tfork_thread(param, stack_addr, start_fnc, start_arg);
+ *                r0     r1     r2         r3
+ * __tfork_thread(param, psize, start_fnc, start_arg);
  */
 
 ENTRY(__tfork_thread)
-	stmdb   sp!, {r4}
-	mov	r4, r1
-
-
 	SYSTRAP(__tfork)
-	bcs	1f
+	bcs	1f		/* XXX can this be PIC_SYM(CERROR, PLT) ? */
 
 	/* check if we are parent or child */
 	cmp	r0, #0
-	ldmneia   sp!, {r4}
 	movne	pc, lr
 
 	/* child */
-	mov	sp, r4
 	mov	r0, r3
 	mov	lr, pc
 	mov	pc, r2
 	nop
 	SYSTRAP(__threxit)
 1:
-	ldmia   sp!, {r4}
-	b     PIC_SYM(CERROR, PLT)
+	b	PIC_SYM(CERROR, PLT)
diff --git a/lib/libc/arch/hppa/sys/tfork_thread.S b/lib/libc/arch/hppa/sys/tfork_thread.S
index 5a77bd3bbea..65a8af3c514 100644
--- a/lib/libc/arch/hppa/sys/tfork_thread.S
+++ b/lib/libc/arch/hppa/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:55 guenther Exp $	*/
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $	*/
 
 /*
  * Copyright (c) 2005, Miodrag Vallat
@@ -28,7 +28,7 @@
 #include "SYS.h"
 
 /*
- * int __tfork_thread(param, void *stack, void (*func)(void *), void *arg);
+ * int __tfork_thread(param, size_t psize, void (*func)(void *), void *arg);
  */
 ENTRY(__tfork_thread, 0)
 	SYSCALL(__tfork)
@@ -36,20 +36,8 @@ ENTRY(__tfork_thread, 0)
 	 nop
 
 	/*
-	 * In child process: switch stack, invoke function, then exit.
+	 * In child process: invoke function, then exit.
 	 */
-
-	/*
-	 * PIC code expects 32 bytes of room available below sp.
-	 * Then the regular procedure invocation requires us to allocate
-	 * 64 bytes as well.
-	 */
-	copy	arg1, sp
-	ldo	0(sp), r3
-	stw,ma	r0, HPPA_FRAME_SIZE(sp)
-	stw	r0, HPPA_FRAME_CRP(sp)
-	stw	r0, HPPA_FRAME_PSP(sp)
-
 	copy	arg3, arg0		/* arg */
 	copy	arg2, t1
 	bl	$$dyncall, r31
diff --git a/lib/libc/arch/hppa64/sys/tfork_thread.S b/lib/libc/arch/hppa64/sys/tfork_thread.S
index 96a8e4a72f6..4fd2cb67700 100644
--- a/lib/libc/arch/hppa64/sys/tfork_thread.S
+++ b/lib/libc/arch/hppa64/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/04/11 12:27:08 jsing Exp $	*/
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $	*/
 /*
  * Copyright (c) 2005, Miodrag Vallat
  *
@@ -27,7 +27,7 @@
 #include "SYS.h"
 
 /*
- * int __tfork_thread(param, void *stack, void (*func)(void *), void *arg);
+ * int __tfork_thread(param, size_t psize, void (*func)(void *), void *arg);
  */
 ENTRY(__tfork_thread, 0)
 	SYSCALL(__tfork)
@@ -35,13 +35,8 @@ ENTRY(__tfork_thread, 0)
 	 nop
 
 	/*
-	 * In child process: switch stack, invoke function, then exit.
+	 * In child process: invoke function, then exit.
 	 */
-	copy	%arg1, %sp
-	ldo	0(%sp), %r3
-	std,ma	%r0, HPPA_FRAME_SIZE(%sp)
-	std	%r0, HPPA_FRAME_PSP(%sp)
-
 	copy	%arg3, %arg0		/* arg */
 	copy	%arg2, %t1
 	b,l	$$dyncall, %r31
diff --git a/lib/libc/arch/i386/sys/tfork_thread.S b/lib/libc/arch/i386/sys/tfork_thread.S
index 4b7de1b030c..57a7339eed3 100644
--- a/lib/libc/arch/i386/sys/tfork_thread.S
+++ b/lib/libc/arch/i386/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.2 2012/04/11 18:36:57 kettenis Exp $ */
+/*	$OpenBSD: tfork_thread.S,v 1.3 2012/06/21 00:56:59 guenther Exp $ */
 /*-
  * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
  * All rights reserved.
@@ -37,11 +37,11 @@ __FBSDID("$FreeBSD: /repoman/r/ncvs/src/lib/libc/i386/gen/rfork_thread.S,v 1.5 2
 #include "SYS.h"
 
 /*
- *                8      12          16         20
- * __tfork_thread(param, stack_addr, start_fnc, start_arg);
+ *                8      12     16         20
+ * __tfork_thread(param, psize, start_fnc, start_arg);
  *
  * param:		Arguments to actual system call.
- * stack_addr:		Top of stack for thread.
+ * psize:		Other argument to pass to the actual kernel call.
  * start_fnc:		Address of thread function to call in child.
  * start_arg:		Argument to pass to the thread function in child.
  */
@@ -50,25 +50,20 @@ ENTRY(__tfork_thread)
 	pushl	%ebp
 	movl	%esp, %ebp
 	pushl	%esi
+	pushl	%edi
 
 	/*
-	 * Push thread info onto the new thread's stack
+	 * Save the thread info in esi and ebx
 	 */
-	movl	12(%ebp), %esi	# get stack addr
-
-	subl	$4, %esi
-	movl	20(%ebp), %eax	# get start argument
-	movl	%eax, (%esi)
-
-	subl	$4, %esi
-	movl	16(%ebp), %eax	# get start thread address
-	movl	%eax, (%esi)
+	movl	16(%ebp), %esi	# get start thread address
+	movl	20(%ebp), %edi	# get start argument
 
 	/*
 	 * Prepare and execute the thread creation syscall
 	 */
-	pushl	8(%ebp)
-	pushl	$0
+	pushl	12(%ebp)	# push psize
+	pushl	8(%ebp)		# push param
+	pushl	$0		# slot for return address, ignored by kernel
 	movl	$SYS___tfork, %eax
 	int	$0x80
 	jb 	2f
@@ -78,7 +73,8 @@ ENTRY(__tfork_thread)
 	 */
 	cmpl	$0, %edx
 	jnz	1f
-	addl	$8, %esp
+	addl	$12, %esp
+	popl	%edi
 	popl	%esi
 	movl	%ebp, %esp
 	popl	%ebp
@@ -88,20 +84,19 @@ ENTRY(__tfork_thread)
 	/*
 	 * If we are in the child (new thread), then
 	 * set-up the call to the internal subroutine.  If it
-	 * returns, then call __exit.
+	 * returns, then call __threxit.
 	 */
 1:
 	xorl	%ebp, %ebp	# mark outermost frame
-	movl	%esi, %esp
-	popl	%eax 
-	call	*%eax
+	pushl	%edi		# push start argument
+	call	*%esi
 	addl	$4, %esp
 
 	/*
 	 * Exit system call
 	 */
-	pushl	%eax
-	pushl	$0
+	pushl	$0		# NULL pointer argument to __threxit
+	pushl	$0		# slot for return address, ignored by kernel
 	movl	$SYS___threxit, %eax
 	int	$0x80
 
@@ -109,7 +104,8 @@ ENTRY(__tfork_thread)
 	 * Branch here if the thread creation fails:
 	 */
 2:
-	addl	$8, %esp
+	addl	$12, %esp
+	popl	%edi
 	popl	%esi
 	movl	%ebp, %esp
 	popl	%ebp
diff --git a/lib/libc/arch/m68k/sys/tfork_thread.S b/lib/libc/arch/m68k/sys/tfork_thread.S
index 2d6d791ae42..b44442f2bcb 100644
--- a/lib/libc/arch/m68k/sys/tfork_thread.S
+++ b/lib/libc/arch/m68k/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:55 guenther Exp $	*/
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $	*/
 
 /*
  * Copyright (c) 2005, Miodrag Vallat
@@ -28,14 +28,13 @@
 #include "SYS.h"
 
 /*
- * int __tfork_thread(const struct __tfork *param, void *stack, void (*func)(void *), void *arg);
+ * int __tfork_thread(const struct __tfork *param, size_t psize, void (*func)(void *), void *arg);
  */
 ENTRY(__tfork_thread)
 	/*
-	 * Set up the new thread's stack.
+	 * Move info for the new thread into registers.
 	 */
-	movl	sp@(8), a0	/* stack */
-	movl	sp@(16), a0@-	/* arg */
+	movl	sp@(16), a0	/* arg */
 	movl	sp@(12), a1	/* func */
 
 	/*
@@ -55,9 +54,9 @@ ENTRY(__tfork_thread)
 
 1:
 	/*
-	 * child process: switch stacks, invoke function, then exit.
+	 * child process: invoke function, then exit.
 	 */
-	movl	a0, sp		/* stack with arg pushed on it */
+	movl	a0, sp@-	/* stack with arg pushed on it */
 	jsr	a1@		/* func */
 	addq	#4, sp
 
diff --git a/lib/libc/arch/m88k/sys/tfork_thread.S b/lib/libc/arch/m88k/sys/tfork_thread.S
index 351d93151da..df901bba981 100644
--- a/lib/libc/arch/m88k/sys/tfork_thread.S
+++ b/lib/libc/arch/m88k/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:55 guenther Exp $	*/
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $	*/
 
 /*
  * Copyright (c) 2005, Miodrag Vallat
@@ -28,10 +28,9 @@
 #include "SYS.h"
 
 /*
- * int __tfork_thread(const struct __tfork *param, void *stack, void (*func)(void *), void *arg);
+ * int __tfork_thread(const struct __tfork *param, size_t psize, void (*func)(void *), void *arg);
  */
 ENTRY(__tfork_thread)
-	or	r6,  r3,  r0	/* save stack */
 	or	r13, r0,  __SYSCALLNAME(SYS_,__tfork)
 	tb0	0,   r0,  128	/* corrupts r2 and r3 in the child */
 	br	__cerror
@@ -45,9 +44,8 @@ ENTRY(__tfork_thread)
 
 1:
 	/*
-	 * In child process: switch stack, invoke function, then exit.
+	 * In child process: invoke function, then exit.
 	 */
-	or	r31, r6,  r0	/* stack */
 	jsr.n	r4		/* func */
 	 or	r2,  r5,  r0	/* arg */
 
diff --git a/lib/libc/arch/mips64/sys/tfork_thread.S b/lib/libc/arch/mips64/sys/tfork_thread.S
index aaedba7df17..b0cf318553a 100644
--- a/lib/libc/arch/mips64/sys/tfork_thread.S
+++ b/lib/libc/arch/mips64/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:55 guenther Exp $	*/
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $	*/
 
 /*
  * Copyright (c) 2005, Miodrag Vallat
@@ -28,27 +28,26 @@
 #include "SYS.h"
 
 /*
- * int __tfork_thread(const struct __tfork *param, void *stack, void (*func)(void *), void *arg);
+ * int __tfork_thread(const struct __tfork *param, size_t psize, void (*func)(void *), void *arg);
  */
 FRAMESZ=4*REGSZ
 GPOFF=FRAMESZ-2*REGSZ
 LEAF(__tfork_thread, FRAMESZ)
-	/* a0 = param, a1 = stack, a2 = func, a3 = arg */
+	/* a0 = param, a1 = psize, a2 = func, a3 = arg */
 	PTR_SUBU sp, FRAMESZ
 	SETUP_GP64(GPOFF, _C_LABEL(__tfork_thread))
 	.set	reorder
 
-	move	t0, a1		/* stack */
 	move	t1, a3		/* arg */
 
 	__DO_SYSCALL(__tfork)
 	bnez	a3, 9f
 
+	beqz	v0, 1f
+
 	RESTORE_GP64
 	PTR_ADDU sp, FRAMESZ
 
-	beqz	v0, 1f
-
 	/*
 	 * In parent process: just return.
 	 */
@@ -56,10 +55,9 @@ LEAF(__tfork_thread, FRAMESZ)
 
 1:
 	/*
-	 * In child process: switch stack, invoke function, then exit.
+	 * In child process: invoke function, then exit.
 	 */
 
-	move	sp, t0		/* stack */
 	move	t9, a2		/* func */
 	move	a0, t1		/* arg */
 	move	v0, zero
diff --git a/lib/libc/arch/powerpc/sys/tfork_thread.S b/lib/libc/arch/powerpc/sys/tfork_thread.S
index 2e9a46a7664..aa5f59c966d 100644
--- a/lib/libc/arch/powerpc/sys/tfork_thread.S
+++ b/lib/libc/arch/powerpc/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:56 guenther Exp $	*/
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $	*/
 
 /*
  * Copyright (c) 2005 Tim Wiess <tim@nop.cx>
@@ -21,13 +21,9 @@
 
 ENTRY(__tfork_thread)
 	/* sanity check */
-	cmpwi	%r4, 0
-	beq	1f
 	cmpwi	%r5, 0
 	beq	1f
 	
-	mr	%r7,%r4
-	
 	/* call __tfork */
 	li	%r0, SYS___tfork
 	sc
@@ -41,7 +37,7 @@ ENTRY(__tfork_thread)
 	/* child */
 	mtlr	%r5		/* fp */
 	mr	%r3, %r6	/* arg */
-	subi	%r1, %r7, 16	/* fixup sp to get headroom */
+	subi	%r1, %r1, 16	/* fixup sp to get headroom */
 	blrl
 	
 	/* child returned, call _exit */
diff --git a/lib/libc/arch/sh/sys/tfork_thread.S b/lib/libc/arch/sh/sys/tfork_thread.S
index bfca155e1d0..49235c0b829 100644
--- a/lib/libc/arch/sh/sys/tfork_thread.S
+++ b/lib/libc/arch/sh/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:56 guenther Exp $	*/
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $	*/
 
 /*
  * Copyright (c) 2007 Miodrag Vallat.
@@ -20,7 +20,7 @@
 #include "SYS.h"
 
 /*
- * int __tfork_thread(const struct __tfork *param, void *stack, void (*func)(void *), void *arg);
+ * int __tfork_thread(const struct __tfork *param, size_t psize, void (*func)(void *), void *arg);
  *			r4			r5		   r6		r7
  */
 ENTRY(__tfork_thread)
@@ -39,9 +39,8 @@ ENTRY(__tfork_thread)
 
 1:
 	/*
-	 * In child process: switch stack, invoke function, then exit.
+	 * In child process: invoke function, then exit.
 	 */
-	mov	r5, sp
 	jsr	@r6
 	 mov	r7, r4
 
diff --git a/lib/libc/arch/sparc/sys/tfork_thread.S b/lib/libc/arch/sparc/sys/tfork_thread.S
index 882a07f7234..09bf0083810 100644
--- a/lib/libc/arch/sparc/sys/tfork_thread.S
+++ b/lib/libc/arch/sparc/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:56 guenther Exp $	*/
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $	*/
 
 /*
  * Copyright (c) 2005, Miodrag Vallat
@@ -28,11 +28,9 @@
 #include "SYS.h"
 
 /*
- * int __tfork_thread(const struct __tfork *param, void *stack, void (*func)(void *), void *arg);
+ * int __tfork_thread(const struct __tfork *param, size_t psize, void (*func)(void *), void *arg);
  */
 ENTRY(__tfork_thread)
-	mov	%o1, %o4	/* save stack */
-
 	/*
 	 * We can not invoke __tfork as a G2-style system call since we want
 	 * different return paths.
@@ -54,12 +52,8 @@ ENTRY(__tfork_thread)
 
 1:
 	/*
-	 * In child process: switch stack, invoke function, then exit.
-	 * Don't forget to allocate room for a window save on the new
-	 * stack!
+	 * In child process: invoke function, then exit.
 	 */
-	sub	%g0, %g0, %fp
-	sub	%o4, 96, %sp	/* stack */
 	call	%o2		/* func */
 	 mov	%o3, %o0	/* arg */
 
diff --git a/lib/libc/arch/sparc64/sys/tfork_thread.S b/lib/libc/arch/sparc64/sys/tfork_thread.S
index d22aba43a55..cf70b25d401 100644
--- a/lib/libc/arch/sparc64/sys/tfork_thread.S
+++ b/lib/libc/arch/sparc64/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:56 guenther Exp $	*/
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $	*/
 
 /*
  * Copyright (c) 2005, Miodrag Vallat
@@ -28,11 +28,9 @@
 #include "SYS.h"
 
 /*
- * int __tfork_thread(const struct __tfork *param, void *stack, void (*func)(void *), void *arg);
+ * int __tfork_thread(const struct __tfork *param, size_t psize, void (*func)(void *), void *arg);
  */
 ENTRY(__tfork_thread)
-	mov	%o1, %o4	/* save stack */
-
 	/*
 	 * We can not invoke __tfork as a G2-style system call since we want
 	 * different return paths.
@@ -54,11 +52,8 @@ ENTRY(__tfork_thread)
 
 1:
 	/*
-	 * In child process: switch stack, invoke function, then exit.
+	 * In child process: invoke function, then exit.
 	 */
-
-	mov	%g0, %fp			/* clear frame pointer */
-	sub	%o4, (BIAS + CC64FSZ), %sp	/* stack */
 	call	%o2				/* func */
 	 mov	%o3, %o0			/* arg */
 
diff --git a/lib/libc/arch/vax/sys/tfork_thread.S b/lib/libc/arch/vax/sys/tfork_thread.S
index 1d22f1e924b..123c4a83641 100644
--- a/lib/libc/arch/vax/sys/tfork_thread.S
+++ b/lib/libc/arch/vax/sys/tfork_thread.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:56 guenther Exp $	*/
+/*	$OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $	*/
 
 /*
  * Copyright (c) 2005, Miodrag Vallat
@@ -28,15 +28,14 @@
 #include "SYS.h"
 
 /*
- * int __tfork_thread(const struct __tfork *param, void *stack, void (*func)(void *), void *arg);
+ * int __tfork_thread(const struct __tfork *param, size_t psize, void (*func)(void *), void *arg);
  */
-ENTRY(__tfork_thread, R2|R3|R4)
+ENTRY(__tfork_thread, R2|R3)
 	/*
 	 * Save thread creation arguments into registers.
 	 */
-	movl	8(ap), r2	/* stack */
-	movl	12(ap), r3	/* func */
-	movl	16(ap), r4	/* arg */
+	movl	12(ap), r2	/* func */
+	movl	16(ap), r3	/* arg */
 
 	__DO_SYSCALL(__tfork)
 	jcs	9f
@@ -55,9 +54,8 @@ ENTRY(__tfork_thread, R2|R3|R4)
 	 * Note that since we can not pass a register to calls, we need
 	 * to waste 4 bytes of stack in every thread.
 	 */
-	movl	r2, sp		/* stack */
-	pushl	r3		/* func */
-	pushl	r4		/* arg */
+	pushl	r2		/* func */
+	pushl	r3		/* arg */
 	calls	$1, *4(sp)	/* func */
 
 	__DO_SYSCALL(__threxit)
diff --git a/lib/libc/shlib_version b/lib/libc/shlib_version
index 56a8145c9df..bb49a127eb9 100644
--- a/lib/libc/shlib_version
+++ b/lib/libc/shlib_version
@@ -1,4 +1,4 @@
-major=64
-minor=2
+major=65
+minor=0
 # note: If changes were made to include/thread_private.h or if system
 # calls were added/changed then libpthread must also be updated.