File: [local] / sys / arch / m68k / m68k / sigreturn.s (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:06:32 2008 UTC (16 years, 6 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
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/* $OpenBSD: sigreturn.s,v 1.3 2003/06/02 23:27:48 millert Exp $ */
/* $NetBSD: sigreturn.s,v 1.2 1997/04/25 02:22:04 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. 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.
*/
ASENTRY_NOPROFILE(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 _C_LABEL(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 _ASM_LABEL(rei) | all done