/*      $NetBSD: ptrace.S,v 1.14 2025/05/06 20:21:33 uwe Exp $ */

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *      from: @(#)ptrace.s      5.1 (Berkeley) 4/23/90
 */

#include "SYS.h"

ENTRY(ptrace)
#ifdef _REENTRANT
#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
        push    {r0-r3, lr}
#else
        push    {r0-r4}
        mov     r4, lr
#endif
        sub     sp, sp, #4      /* align stack */
        bl      PLT_SYM(_C_LABEL(__errno))
        add     sp, sp, #4      /* unalign stack */
        movs    r1, #0
        str     r1, [r0]
#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
        pop     {r0-r3, lr}
#else
        mov     lr, r4
        pop     {r0-r4}
#endif
#else
        push    {r0, r1}
#ifdef __PIC__
        /* Setup the GOT */
        ldr     r0, .Lgot
        adr     r1, .Lgot
        add     r0, r0, r1
        ldr     r1, .Lerrno
        ldr     r1, [r0, r1]
#else
        ldr     r1, .Lerrno
#endif /* __PIC__ */
        movs    r0, #0
        str     r0, [r1]
        pop     {r0, r1}
#endif /* _REENTRANT */

        SYSTRAP(ptrace)
        _INVOKE_CERROR()
        RET

#ifndef _REENTRANT
#ifdef __PIC__
        .align  0
.Lgot:
        .word   _C_LABEL(_GLOBAL_OFFSET_TABLE_) - .Lgot
#endif /* __PIC__ */

.Lerrno:
        .word   PIC_SYM(_C_LABEL(errno), GOT)
#endif /* !_REENTRANT */
END(ptrace)