diff options
| -rw-r--r-- | sys/arch/m68k/m68k/sigreturn.s | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/sys/arch/m68k/m68k/sigreturn.s b/sys/arch/m68k/m68k/sigreturn.s new file mode 100644 index 00000000000..63017e36048 --- /dev/null +++ b/sys/arch/m68k/m68k/sigreturn.s @@ -0,0 +1,88 @@ +/* $OpenBSD: sigreturn.s,v 1.1 1996/05/03 08:44:33 niklas Exp $ */ +/* $NetBSD: sigreturn.s,v 1.1 1996/01/31 02:22:15 thorpej Exp $ */ + +/* + * Copyright (c) 1988 University of Utah. + * Copyright (c) 1980, 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Systems Programming Group of the University of Utah Computer + * Science Department. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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: Utah $Hdr: locore.s 1.66 92/12/22$ + * + * @(#)locore.s 8.6 (Berkeley) 5/27/94 + */ + +/* + * NOTICE: This is not a standalone file. To use it, #include it in + * your port's locore.s, like so: + * + * #include <m68k/m68k/sigreturn.s> + */ + +/* + * The sigreturn() syscall comes here. It requires special handling + * because we must open a hole in the stack to fill in the (possibly much + * larger) original stack frame. + */ +sigreturn: + lea sp@(-84),sp | leave enough space for largest frame + movl sp@(84),sp@ | move up current 8 byte frame + movl sp@(88),sp@(4) + movl #84,sp@- | default: adjust by 84 bytes + moveml #0xFFFF,sp@- | save user registers + movl usp,a0 | save the user SP + movl a0,sp@(FR_SP) | in the savearea + movl #SYS_sigreturn,sp@- | push syscall number + jbsr _syscall | handle it + addql #4,sp | pop syscall# + movl sp@(FR_SP),a0 | grab and restore + movl a0,usp | user SP + lea sp@(FR_HW),a1 | pointer to HW frame + movw sp@(FR_ADJ),d0 | do we need to adjust the stack? + jeq Lsigr1 | no, just continue + moveq #92,d1 | total size + subw d0,d1 | - hole size = frame size + lea a1@(92),a0 | destination + addw d1,a1 | source + lsrw #1,d1 | convert to word count + subqw #1,d1 | minus 1 for dbf +Lsigrlp: + movw a1@-,a0@- | copy a word + dbf d1,Lsigrlp | continue + movl a0,a1 | new HW frame base +Lsigr1: + movl a1,sp@(FR_SP) | new SP value + moveml sp@+,#0x7FFF | restore user registers + movl sp@,sp | and our SP + jra rei | all done |