1/* $NetBSD: ptrace.S,v 1.12 2013/11/30 20:20:42 joerg Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * from: @(#)ptrace.s 5.1 (Berkeley) 4/23/90 32 */ 33 34#include "SYS.h" 35 36ENTRY(ptrace) 37#ifdef _REENTRANT 38#if !defined(__thumb__) || defined(_ARM_ARCH_T2) 39 push {r0-r3, lr} 40#else 41 push {r0-r4} 42 mov r4, lr 43#endif 44 sub sp, sp, #4 /* align stack */ 45 bl PLT_SYM(_C_LABEL(__errno)) 46 add sp, sp, #4 /* unalign stack */ 47 movs r1, #0 48 str r1, [r0] 49#if !defined(__thumb__) || defined(_ARM_ARCH_T2) 50 pop {r0-r3, lr} 51#else 52 mov lr, r4 53 pop {r0-r4} 54#endif 55#else 56 push {r0, r1} 57#ifdef __PIC__ 58 /* Setup the GOT */ 59 ldr r0, .Lgot 60 adr r1, .Lgot 61 add r0, r0, r1 62 ldr r1, .Lerrno 63 ldr r1, [r0, r1] 64#else 65 ldr r1, .Lerrno 66#endif /* __PIC__ */ 67 movs r0, #0 68 str r0, [r1] 69 pop {r0, r1} 70#endif /* _REENTRANT */ 71 72 SYSTRAP(ptrace) 73 _INVOKE_CERROR() 74 RET 75 76#ifndef _REENTRANT 77#ifdef __PIC__ 78 .align 0 79.Lgot: 80 .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - .Lgot 81#endif /* __PIC__ */ 82 83.Lerrno: 84 .word PIC_SYM(_C_LABEL(errno), GOT) 85#endif /* !_REENTRANT */ 86END(ptrace) 87