107 lines
3.2 KiB
ArmAsm
107 lines
3.2 KiB
ArmAsm
/* $NetBSD: start.s,v 1.3 1994/10/26 09:11:54 cgd Exp $ */
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/*
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* Copyright (c) 1993 Adam Glass
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Adam Glass.
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* 4. The name of the Author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY Adam Glass ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "assym.s"
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#include "../include/asm.h"
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.text
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.globl start
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start:
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movl #FIXED_LOAD_ADDR,a0 | where we are (a0)
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lea start:l, a1 | where we want to be (a1)
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cmpl a0, a1
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jeq begin
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movl #_edata, d0
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copy:
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movl a0@+,a1@+
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cmpl d0, a1
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jne copy
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jmp begin:l
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/* find out where we are, and copy ourselves to where we are supposed to be */
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.align 4
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begin:
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moveq #FC_CONTROL, d0 | make movs get us to the control
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movc d0, dfc | space where the sun3 designers
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movc d0, sfc | put all the "useful" stuff
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moveq #CONTEXT_0, d0
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movsb d0, CONTEXT_REG | now in context 0
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savesp: movl sp, start-4:l
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lea start-4:l, sp
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movl #(FIXED_LOAD_ADDR-4), sp
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jsr _machdep_nfsboot
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jsr FIXED_LOAD_ADDR
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/*
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* unsigned int get_control_word (char *)
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*/
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ENTRY(get_control_word)
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movl sp@(4), a0
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movsl a0@, d0
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rts
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/*
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* void set_control_word (char *, unsigned int)
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*/
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ENTRY(set_control_word)
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movl sp@(4), a0
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movl sp@(8), d0
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movsl d0, a0@
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rts
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/*
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* unsigned char get_control_byte (char *)
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*/
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ENTRY(get_control_byte)
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movl sp@(4), a0
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moveq #0, d0
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movsb a0@, d0
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rts
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/*
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* Get callers current SP value.
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* Note that simply taking the address of a local variable in a C function
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* doesn't work because callee saved registers may be outside the stack frame
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* defined by A6 (e.g. GCC generated code).
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*
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* [I don't think the ENTRY() macro will do the right thing with this -- glass]
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*/
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.globl _getsp; .align 2
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_getsp:
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movl sp,d0 | get current SP
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addql #4,d0 | compensate for return address
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rts
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