diff options
Diffstat (limited to 'kernel/arch/vax/h_execregs.S')
| -rw-r--r-- | kernel/arch/vax/h_execregs.S | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/kernel/arch/vax/h_execregs.S b/kernel/arch/vax/h_execregs.S new file mode 100644 index 000000000000..27c5c2052867 --- /dev/null +++ b/kernel/arch/vax/h_execregs.S @@ -0,0 +1,87 @@ +/* $NetBSD: h_execregs.S,v 1.1 2025/02/27 00:55:32 riastradh Exp $ */ + +/*- + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. + */ + +#define _LOCORE + +#include <sys/syscall.h> + +#include <machine/asm.h> + +#include "execregs.h" + +#define REGSIZE 4 +#define BUFSIZE (NEXECREGS * REGSIZE) +#define SLOT(n) (n)*REGSIZE(%sp) + +ENTRY(execregs_start, 0) + /* store registers to a buffer on stack */ + subl2 $BUFSIZE,%sp /* space for NEXECREGS registers */ + movl %fp,SLOT(0) /* order matches execregs.h */ + movl %ap,SLOT(1) + /* sp: stack pointer */ + movl %r0,SLOT(2) + movl %r1,SLOT(3) + movl %r2,SLOT(4) + movl %r3,SLOT(5) + movl %r4,SLOT(6) + movl %r5,SLOT(7) + /* r6: initial stack pointer */ + movl %r7,SLOT(8) + movl %r8,SLOT(9) + /* r9: ps_strings */ + movl %r10,SLOT(10) + movl %r11,SLOT(11) + + /* call write(STDOUT_FILENO, regs, sizeof(regs)) */ + pushl $BUFSIZE /* arg2 := sizeof(regs) */ + pushal 4(%sp) /* arg1 := regs */ + pushl $1 /* arg0 := STDOUT_FILENO */ + pushl $3 /* number of arguments */ + movl %sp,%ap /* argument pointer */ + chmk $SYS_write + + bcs 2f /* bail if write failed */ + cmpl $BUFSIZE,%r0 /* bail if wrote wrong # of bytes */ + bneq 2f + + /* call exit(0) */ + pushl $0 /* arg0 := 0 */ +1: pushl $1 /* number of arguments */ + movl %sp,%ap /* argument pointer */ + chmk $SYS_exit + .word 0xffff /* paranoia -- illegal opcode */ + +2: /* call exit(127) */ + pushl $127 /* arg0 := 127 */ + jmp 1b +END(execregs_start) + +/* main stub to simplify linking */ +ENTRY(main, 0) + .word 0xffff /* illegal opcode */ +END(main) |