NetBSD/libexec/ld.elf_so/arch/vax/rtld_start.S

73 lines
2.9 KiB
ArmAsm

/* $NetBSD: rtld_start.S,v 1.6 2000/08/07 01:47:07 matt Exp $ */
/*
* Copyright 1996 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.
*/
#include <machine/asm.h>
/* R9 contains the address of PS_STRINGS and since its caller saved,
* we can just use it. R6 has a backup copy of the stack pointer which
* we can use as well. Since the VAX has perfectly PIC code, we don't
* need to relocate anything upon startup.
*/
ENTRY(_rtld_start, 0)
/* Allocate space on the stack for the cleanup and obj_main
* entries that _rtld() will provide for us.
*/
clrl fp
subl2 $8,sp
pushl sp
calls $1,_rtld
movq (sp)+,r7 /* grab cleanup and obj_main into r7/r8 */
jmp 2(r0) /* jump to entry point + 2 */
/*
* Lazy binding entry point, called via PLT.
*/
ALTENTRY(_rtld_bind_start)
pushr $0xff /* save R0-R7 */
movq 32(sp),r0 /* get addresses of plt.got & reloc index */
pushl (r1) /* push relocation index */
pushl r0 /* push address of obj entry */
calls $2,_rtld_bind
movpsl -(sp) /* flush the instruction cache */
pushab 1f /* by issuing an */
rei /* rei. */
1: movl r0,36(sp) /* save return address onto stack */
2: bicw3 6(fp),(r0),r0 /* does the entry mask save any additional regs */
popr $0xff /* restore R0-R7 (cond flags not modified) */
bneq 4f /* yes? do it the hard way */
3: addl2 $4,sp /* no? skip past plt.got on stack */
addl2 $2,(sp) /* skip past the mask */
rsb /* and jump to it */
4: addl2 $4,sp
callg (ap),*(sp)+ /* return value from _rtld_bind() == actual */
ret