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locks; strict;
comment	@# @;


1.10
date	98.12.17.15.38.58;	author pk;	state dead;
branches;
next	1.9;

1.9
date	98.10.31.08.59.58;	author matt;	state Exp;
branches;
next	1.8;

1.8
date	98.10.23.00.51.36;	author matt;	state Exp;
branches;
next	1.7;

1.7
date	98.10.19.03.09.33;	author matt;	state Exp;
branches;
next	1.6;

1.6
date	98.08.26.15.32.02;	author matt;	state Exp;
branches;
next	1.5;

1.5
date	98.08.21.01.03.49;	author matt;	state Exp;
branches;
next	1.4;

1.4
date	98.08.20.15.12.03;	author matt;	state Exp;
branches;
next	1.3;

1.3
date	98.08.18.18.46.16;	author matt;	state Exp;
branches;
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1.2
date	98.01.05.22.00.49;	author cgd;	state Exp;
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next	1.1;

1.1
date	95.10.19.13.10.22;	author ragge;	state Exp;
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desc
@@


1.10
log
@These files now live in `src/libexec/ld.aout_so/arch'
@
text
@/*	$NetBSD: mdprologue.S,v 1.9 1998/10/31 08:59:58 matt Exp $	*/

/*
 * Copyright (c) 1998 Matt Thomas <matt@@3am-software.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * i386 run-time link editor entry points.
 */

	.text
	.globl	_binder, _binder_entry
	.globl	_rtl
	.type	_rtl,@@function

/*
 *	_rtl(int version, struct crt_ldso *crtp)
 */

	.align	2
_rtl:					/* crt0 calls us here */
	.word	0			/* no registers to save */
	movl	8(ap),r0		/* load crtp into r0 */
					/* setup arguments for rtld() */
	/*
	 * Add the 1st entry in the GOT (e.g. __DYNAMIC) to the base
	 * address of ld.so and pushd that onto the stack.
	 */
	addl3	__GLOBAL_OFFSET_TABLE_,(r0),-(sp)
	pushl	r0			/* 2nd arg == crtp */
	pushl	4(ap)			/* 1st arg == version */
	calls	$3,_rtld		/* _rtld(version, crtp, DYNAMIC) */
	movpsl	-(sp)			/* flush the instruction cache */
	pushab	1f			/*   by issuing an */
	rei				/*   rei. */
1:	ret

/*
 * First call to a procedure generally comes through here for binding.
 * We got here via JSB so now (sp) is inside our jmpslot_t.  So we
 * simply preserve our registers, push the address of jmpslot_t for
 * _binder.  Save the address we are supported to call (which was 
 * returned in R0) in the stack location that the JSB used to store
 * its return address (which we don't care about anymore).
 *
 * Check to see the function has a zero entry mask.  Since we
 * were called with a zero entry, if the function we need to call
 * also has a zero entry mask, we can let it use our call frame
 * and jump inside of it to its first instruction.  Otherwise we'll
 * call the actual function the slow way and return.
 *
 * The above optimization is required in order for vfork(2) to
 * work properly in shared libraries.  DO NOT REMOVE IT.
 */
	.align	1
	.type	_binder_entry,@@label
_binder_entry:
	pushr	$0x3f		/* save r0 to r5 */
#ifdef DEBUG
	pushl	$29
	pushab	LC1
	pushl	$2
	calls	$3,_write
#endif
	subl3	$8, 24(sp), -(sp) /* point to beginning of jmpslot */
	bicl2	$3, (sp)
	calls	$1, _binder	/* _binder(jsp) */
	movpsl	-(sp)		/* flush the instruction cache */
	pushab	1f		/*   by issuing an */
	rei			/*   rei. */
1:	movl	r0, 24(sp)	/* save return address onto stack */
	popr	$0x3f		/* restore r0 to r5 */
	tstw	*(sp)		/* does the entry mask save any regs */
	bneq	2f		/* yes? do it the hard way */
	addl2	$2,(sp)		/* no? skip past the mask */
	rsb			/*    and jump to it */
2:	callg	(ap), *(sp)+	/* return value from _binder() == actual */
	ret
#ifdef DEBUG
LC1:	.asciz	"ld.so: entered _binder_entry\n"
#endif
@


1.9
log
@Remove reference to unused include file.
@
text
@d1 1
a1 1
/*	$NetBSD: mdprologue.S,v 1.8 1998/10/23 00:51:36 matt Exp $	*/
@


1.8
log
@More fixes and optimizations for VAX shared library support.  Including
one that makes vfork work.
@
text
@d1 1
a1 1
/*	$NetBSD: mdprologue.S,v 1.7 1998/10/19 03:09:33 matt Exp $	*/
a32 2

#include <sys/syscall.h>
@


1.7
log
@Back out change to md_make_gotreloc which added 4 arguement of got_t *.
Add argument to md_fix_jmpslot indicating whether this the first (i.e
tranfer) jmpslot or not.  Add better support for VAX (the VAX can support
pure text code; let ld that advantage of it).  Checking in verified and
working versions of rtld VAX support routines.
@
text
@d1 1
a1 1
/*	$NetBSD: mdprologue.S,v 1.6 1998/08/26 15:32:02 matt Exp $	*/
d65 14
a78 4
 * We got here via JSB so now (sp) is pointing to the reloc_index
 * inside our jmpslot_t.  So we simply preserve our registers,
 * pushd the address again for _binder.  Save R0 on the stack that
 * the JSB used.  Call the actual function and return.
d90 2
a91 1
	subl3	$9, 24(sp), -(sp) /* point to beginning of jmpslot */
d93 4
a96 1
	movl	r0, 24(sp)
d98 5
a102 1
	callg	(ap), *(sp)+	/* return value from _binder() == actual */
@


1.6
log
@Fix some obvious bugs.
@
text
@d1 1
a1 1
/*	$NetBSD: mdprologue.S,v 1.5 1998/08/21 01:03:49 matt Exp $	*/
d38 2
d45 1
a45 1
	.align	1
a49 1
	/* movab	_binder_entry, __PROCEDURE_LINKAGE_TABLE_+4 */
d58 4
a61 1
	ret
d71 1
d74 7
a80 1
	pushl	24(sp)
d86 3
@


1.5
log
@More changes for shareable libraries and PIC code
@
text
@d1 1
a1 1
/*	$NetBSD: mdprologue.S,v 1.4 1998/08/20 15:12:03 matt Exp $	*/
a37 1
	.globl	_GLOBAL_OFFSET_TABLE_
d43 1
d46 1
a46 1
	movl	4(sp),r0		/* load crtp into r0 */
d48 1
d55 1
a55 1
	pushl	(ap)			/* 1st arg == version */
d66 1
a66 1

@


1.4
log
@Get md.c to compile again.  Get mdprologue.S to assemble.  [Now at least
ld and rtld compile and link.]
@
text
@d1 1
a1 1
/*	$NetBSD: mdprologue.S,v 1.3 1998/08/18 18:46:16 matt Exp $	*/
d52 1
a52 1
	addl3	_GLOBAL_OFFSET_TABLE_,(r0),-(sp)
@


1.3
log
@Untested(!!) beginning of VAX a.out shared library support.  This is a work
in progress.
@
text
@d1 1
a1 1
/*	$NetBSD: mdprologue.S,v 1.2 1998/01/05 22:00:49 cgd Exp $	*/
d38 1
d44 8
a51 6
_rtl:					# crt0 calls us here
	.word	0			# no registers to save
	movl	4(sp),r0		# load crtp into r0
					# setup arguments for rtld()
	# Add the 1st entry in the GOT (e.g. __DYNAMIC) to the base
	# address of ld.so and pushd that onto the stack.
d53 3
a55 3
	pushl	r0			# 2nd arg == crtp
	pushl	0(ap)			# 1st arg == version
	calls	$3,_rtld		# _rtld(version, crtp, DYNAMIC)
d58 7
a64 5
 # First call to a procedure generally comes through here for binding.
 # We got here via JSB so now (sp) is pointing to the reloc_index
 # inside our jmpslot_t.  So we simply preserve our registers,
 # pushd the address again for _binder.  Save R0 on the stack that
 # the JSB used.  Call the actual function and return.
d67 1
a67 6
	pushl	r5
	pushl	r4
	pushl	r3
	pushl	r2
	pushl	r1
	pushl	r0
d69 1
a69 1
	calls	#1, _binder		# _binder(jsp)
d71 2
a72 7
	popl	r0
	popl	r1
	popl	r2
	popl	r3
	popl	r4
	popl	r5
	callg	(ap), @@(sp)+		# return value from _binder() == actual
@


1.2
log
@RCS Id police
@
text
@d1 1
a1 1
/*	$NetBSD$	*/
d4 24
a27 1
 * VAX doesn't support PIC (yet?)
d29 50
@


1.1
log
@Vax support for ld, so we (at least) can link static binaries.
@
text
@d1 2
@