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ptrace.S revision 1.8 
      1 /*	$NetBSD: ptrace.S,v 1.8 2006/01/06 20:38:01 uwe Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	from: @(#)ptrace.s	5.1 (Berkeley) 4/23/90
     35  */
     36 
     37 #include <machine/asm.h>
     38 #if defined(SYSLIBC_SCCS) && !defined(lint)
     39 	RCSID("$NetBSD: ptrace.S,v 1.8 2006/01/06 20:38:01 uwe Exp $")
     40 #endif /* SYSLIBC_SCCS and not lint */
     41 
     42 #include "SYS.h"
     43 
     44 /*
     45  * int
     46  * ptrace(int request, pid_t pid, caddr_t addr, int data);
     47  */
     48 ENTRY(ptrace)
     49 #ifdef _REENTRANT
     50 
     51 	mov.l	.L___errno, r1
     52 	PIC_PROLOGUE(.L_GOT)
     53 	sts.l   pr, @-sp
     54 	mov.l	r7, @-sp
     55 	mov.l	r6, @-sp
     56 	mov.l	r5, @-sp
     57 1:	CALL	r1
     58 	 mov.l	r4, @-sp
     59 	mov.l	@sp+, r4
     60 	mov.l	@sp+, r5
     61 	mov.l	@sp+, r6
     62 	mov.l	@sp+, r7
     63 	lds.l   @sp+, pr
     64 	PIC_EPILOGUE
     65 
     66 #else  /* ! _REENTRANT */
     67 
     68 #ifdef PIC
     69 	mova	.L_GOT, r0
     70 	mov.l	.L_GOT, r1
     71 	add	r0, r1
     72 	mov.l	.L_errno, r0
     73 	mov.l	@(r0, r1), r0
     74 #else
     75 	mov.l	.L_errno, r0
     76 #endif
     77 
     78 #endif /* ! _REENTRANT */
     79 
     80 	mov	#0, r1
     81 	mov.l	r1, @r0			/* errno = 0; */
     82 
     83 	mov	#SYS_ptrace, r0
     84 	trapa	#0x80
     85 	bf	err
     86 	rts
     87 	 nop
     88 err:
     89 	JUMP_CERROR
     90 
     91 	.align	2
     92 .L_GOT:
     93 	PIC_GOT_DATUM
     94 
     95 #ifdef _REENTRANT
     96 	.global	_C_LABEL(__errno)
     97 .L___errno:
     98 	CALL_DATUM(_C_LABEL(__errno), 1b)
     99 
    100 #else  /* ! _REENTRANT */
    101 	.global	_C_LABEL(errno)
    102 .L_errno:
    103 #ifdef PIC
    104 	.long	PIC_GOT(_C_LABEL(errno))
    105 #else
    106 	.long	_C_LABEL(errno)
    107 #endif
    108 
    109 #endif /* ! _REENTRANT */
    110 
    111 	SET_ENTRY_SIZE(ptrace)
    112