1/* $NetBSD: ptrace.S,v 1.3 2023/05/07 12:41:47 skrll Exp $ */ 2 3/*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Ralph Campbell. 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 35#include "SYS.h" 36 37#if defined(LIBC_SCCS) && !defined(lint) 38 RCSID("$NetBSD: ptrace.S,v 1.3 2023/05/07 12:41:47 skrll Exp $") 39#endif /* LIBC_SCCS and not lint */ 40 41#define XCALLFRAME_SIZ (8 * SZREG) 42#define XCALLFRAME_RA (0 * SZREG) 43#define XCALLFRAME_A0 (1 * SZREG) 44#define XCALLFRAME_A1 (2 * SZREG) 45#define XCALLFRAME_A2 (3 * SZREG) 46#define XCALLFRAME_A3 (4 * SZREG) 47 48ENTRY(ptrace) 49#ifdef _REENTRANT 50 addi sp, sp, -XCALLFRAME_SIZ 51 REG_S ra, XCALLFRAME_RA(sp) 52 REG_S a0, XCALLFRAME_A0(sp) 53 REG_S a1, XCALLFRAME_A1(sp) 54 REG_S a2, XCALLFRAME_A2(sp) 55 REG_S a3, XCALLFRAME_A3(sp) 56 57 call PLT(_C_LABEL(__errno)) 58 59 INT_S zero, 0(a0) 60 61 REG_L a3, XCALLFRAME_A3(sp) 62 REG_L a2, XCALLFRAME_A2(sp) 63 REG_L a1, XCALLFRAME_A1(sp) 64 REG_L a0, XCALLFRAME_A0(sp) 65 REG_L ra, XCALLFRAME_RA(sp) 66 addi sp, sp, XCALLFRAME_SIZ 67 68#else 69 auipc t0, %hi(_C_LABEL(errno)) 70 INT_S zero, %lo(_C_LABEL(errno))(t0) 71#endif 72 73 SYSTRAP(ptrace) 74 JUMP_TO_CERROR() /* error */ 75 ret /* success */ 76END(ptrace) 77