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