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Annotation of sys/arch/vax/boot/common/srt0.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: srt0.S,v 1.1 2002/06/11 09:36:24 hugh Exp $ */
                      2: /*     $NetBSD: srt0.S,v 1.2 2002/03/31 00:11:14 matt Exp $ */
                      3: /*
                      4:  * Copyright (c) 1994 Ludd, University of Lule}, Sweden.
                      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:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed at Ludd, University of Lule}.
                     18:  * 4. The name of the author may not be used to endorse or promote products
                     19:  *    derived from this software without specific prior written permission
                     20:  *
                     21:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     22:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     23:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     24:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     25:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     26:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     27:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     28:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     29:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     30:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     31:  */
                     32:
                     33:  /* All bugs are subject to removal without further notice */
                     34:
                     35: #include "../include/asm.h"
                     36:
                     37: /*
                     38:  * Auto-moving startup code for standalone programs. Can be loaded
                     39:  * (almost) anywhere in memory but moves itself to the position
                     40:  * it is linked for. Must be started at first position, recommended
                     41:  * is phys addr 0 (boot loads programs at 0, but starts them at the
                     42:  * position set in a.out header.
                     43:  */
                     44:
                     45:        .globl  nisse           # pass -e nisse to ld gives OK start addr
                     46:        .set    nisse,0
                     47:
                     48: ALTENTRY(start)
                     49:        nop;nop;
                     50:        movl    $_C_LABEL(start), sp    # Probably safe place for stack
                     51:        pushr   $0x1fff         # save for later usage
                     52:
                     53:        subl3   $_C_LABEL(start), $_C_LABEL(edata), r0
                     54:        movab   _C_LABEL(start), r1 # get where we are
                     55:        movl    $_C_LABEL(start), r3 # get where we want to be
                     56:        cmpl    r1,r3           # are we where we want to be?
                     57:        beql    relocated       # already relocated, skip copy
                     58:        movc3   r0,(r1),(r3)    # copy
                     59:        subl3   $_C_LABEL(edata), $_C_LABEL(end), r2
                     60:        movc5   $0,(r3),$0,r2,(r3) # Zero bss
                     61:
                     62:        movpsl  -(sp)
                     63:        pushl   $relocated
                     64:        rei
                     65: relocated:                     # now relocation is done !!!
                     66:        movl    sp,_C_LABEL(bootregs)   # *bootregs
                     67:        calls   $0, _C_LABEL(Xmain)     # Were here!
                     68:        halt                    # no return
                     69:
                     70: ENTRY(machdep_start, 0)
                     71:        calls   $0,_C_LABEL(niclose)    # Evil hack to shutdown DEBNA.
                     72:        mtpr    $0x1f,$0x12     # Block all interrupts
                     73:        mtpr    $0,$0x18        # stop real time interrupt clock
                     74:        movl    4(ap), r6
                     75:        movl    20(ap), r9      # end of symbol table
                     76:        pushl   8(ap)           # number of symbols
                     77:        pushl   16(ap)          # start of symbols
                     78:        movab   _C_LABEL(bootrpb),r10   # get RPB address
                     79:        pushl   r10             # argument for new boot
                     80:        ashl    $9,76(r10),r8   # memory size (COMPAT)
                     81:        movl    $3,r11          # ask boot (COMPAT)
                     82:        clrl    r10             # no boot dev (COMPAT)
                     83:
                     84:        calls   $3,(r6)
                     85:        halt