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      1 /*	$NetBSD: h_execregs.S,v 1.1 2025/02/27 00:55:32 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2025 The NetBSD Foundation, Inc.
      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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #define	_LOCORE
     30 
     31 #include <sys/syscall.h>
     32 
     33 #include <machine/asm.h>
     34 
     35 #include "execregs.h"
     36 
     37 #define REGSIZE 4
     38 #define BUFSIZE (NEXECREGS * REGSIZE)
     39 #define SLOT(n)	(n)*REGSIZE(%sp)
     40 
     41 ENTRY(execregs_start, 0)
     42 	/* store registers to a buffer on stack */
     43 	subl2	$BUFSIZE,%sp		/* space for NEXECREGS registers */
     44 	movl	%fp,SLOT(0)		/* order matches execregs.h */
     45 	movl	%ap,SLOT(1)
     46 	/* sp: stack pointer */
     47 	movl	%r0,SLOT(2)
     48 	movl	%r1,SLOT(3)
     49 	movl	%r2,SLOT(4)
     50 	movl	%r3,SLOT(5)
     51 	movl	%r4,SLOT(6)
     52 	movl	%r5,SLOT(7)
     53 	/* r6: initial stack pointer */
     54 	movl	%r7,SLOT(8)
     55 	movl	%r8,SLOT(9)
     56 	/* r9: ps_strings */
     57 	movl	%r10,SLOT(10)
     58 	movl	%r11,SLOT(11)
     59 
     60 	/* call write(STDOUT_FILENO, regs, sizeof(regs)) */
     61 	pushl	$BUFSIZE		/* arg2 := sizeof(regs) */
     62 	pushal	4(%sp)			/* arg1 := regs */
     63 	pushl	$1			/* arg0 := STDOUT_FILENO */
     64 	pushl	$3			/* number of arguments */
     65 	movl	%sp,%ap			/* argument pointer */
     66 	chmk	$SYS_write
     67 
     68 	bcs	2f			/* bail if write failed */
     69 	cmpl	$BUFSIZE,%r0		/* bail if wrote wrong # of bytes */
     70 	bneq	2f
     71 
     72 	/* call exit(0) */
     73 	pushl	$0			/* arg0 := 0 */
     74 1:	pushl	$1			/* number of arguments */
     75 	movl	%sp,%ap			/* argument pointer */
     76 	chmk	$SYS_exit
     77 	.word	0xffff			/* paranoia -- illegal opcode */
     78 
     79 2:	/* call exit(127) */
     80 	pushl	$127			/* arg0 := 127 */
     81 	jmp	1b
     82 END(execregs_start)
     83 
     84 /* main stub to simplify linking */
     85 ENTRY(main, 0)
     86 	.word	0xffff			/* illegal opcode */
     87 END(main)
     88