diff options
Diffstat (limited to 'sys/arch/vax/boot/common/srt0.S')
| -rw-r--r-- | sys/arch/vax/boot/common/srt0.S | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/sys/arch/vax/boot/common/srt0.S b/sys/arch/vax/boot/common/srt0.S new file mode 100644 index 00000000000..8ff71c5a35c --- /dev/null +++ b/sys/arch/vax/boot/common/srt0.S @@ -0,0 +1,85 @@ +/* $OpenBSD: srt0.S,v 1.1 2002/06/11 09:36:24 hugh Exp $ */ +/* $NetBSD: srt0.S,v 1.2 2002/03/31 00:11:14 matt Exp $ */ +/* + * Copyright (c) 1994 Ludd, University of Lule}, Sweden. + * 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed at Ludd, University of Lule}. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. + */ + + /* All bugs are subject to removal without further notice */ + +#include "../include/asm.h" + +/* + * Auto-moving startup code for standalone programs. Can be loaded + * (almost) anywhere in memory but moves itself to the position + * it is linked for. Must be started at first position, recommended + * is phys addr 0 (boot loads programs at 0, but starts them at the + * position set in a.out header. + */ + + .globl nisse # pass -e nisse to ld gives OK start addr + .set nisse,0 + +ALTENTRY(start) + nop;nop; + movl $_C_LABEL(start), sp # Probably safe place for stack + pushr $0x1fff # save for later usage + + subl3 $_C_LABEL(start), $_C_LABEL(edata), r0 + movab _C_LABEL(start), r1 # get where we are + movl $_C_LABEL(start), r3 # get where we want to be + cmpl r1,r3 # are we where we want to be? + beql relocated # already relocated, skip copy + movc3 r0,(r1),(r3) # copy + subl3 $_C_LABEL(edata), $_C_LABEL(end), r2 + movc5 $0,(r3),$0,r2,(r3) # Zero bss + + movpsl -(sp) + pushl $relocated + rei +relocated: # now relocation is done !!! + movl sp,_C_LABEL(bootregs) # *bootregs + calls $0, _C_LABEL(Xmain) # Were here! + halt # no return + +ENTRY(machdep_start, 0) + calls $0,_C_LABEL(niclose) # Evil hack to shutdown DEBNA. + mtpr $0x1f,$0x12 # Block all interrupts + mtpr $0,$0x18 # stop real time interrupt clock + movl 4(ap), r6 + movl 20(ap), r9 # end of symbol table + pushl 8(ap) # number of symbols + pushl 16(ap) # start of symbols + movab _C_LABEL(bootrpb),r10 # get RPB address + pushl r10 # argument for new boot + ashl $9,76(r10),r8 # memory size (COMPAT) + movl $3,r11 # ask boot (COMPAT) + clrl r10 # no boot dev (COMPAT) + + calls $3,(r6) + halt |