112 lines
3.3 KiB
ArmAsm
112 lines
3.3 KiB
ArmAsm
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ralph Campbell.
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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 the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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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* from: @(#)crt0.s 8.2 (Berkeley) 3/21/94
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* $Id: crt0.S,v 1.1 1994/05/24 07:33:49 glass Exp $
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*/
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#include <machine/regdef.h>
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#include <machine/machAsmDefs.h>
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.comm environ, 4
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.data
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.align 2
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.globl __progname
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__progname:
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.word $L1
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$L1:
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.word 0 # null string plus padding
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.text
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NON_LEAF(start, 24, ra)
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.set noreorder
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lw s0, 0(sp) # get argc from stack
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addu s1, sp, 4 # get pointer to argv
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addu s2, s1, 4 # skip null pointer on stack
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sll v0, s0, 2 # add number of argv pointers
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addu s2, s2, v0 # final pointer to environment list
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sw s2, environ # save environment pointer
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subu sp, sp, 24 # allocate standard frame
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.mask 0x80000000, -4
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sw zero, 20(sp) # clear return address for debugging
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#ifdef MCRT0
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eprol:
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la a0, eprol
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la a1, etext
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jal monstartup # monstartup(eprol, etext);
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nop
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la a0, _mcleanup
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jal atexit # atext(_mcleanup);
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nop
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sw zero, errno
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#endif
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lw a0, 0(s1) # a0 = argv[0];
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nop
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beq a0, zero, 2f # skip if a0 == NULL
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move s3, a0 # save argv[0]
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jal strrchr
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li a1, 0x2f # a1 = '/'
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bne v0, zero, 1f # if slash found
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addu v0, v0, 1
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move v0, s3 # v0 = argv[0];
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1:
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sw v0, __progname
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2:
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move a0, s0
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move a1, s1
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jal main # v0 = main(argc, argv, env);
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move a2, s2
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jal exit # exit(v0);
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move a0, v0
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break 0
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.set reorder
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END(start)
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#ifndef MCRT0
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LEAF(moncontrol)
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j ra
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END(moncontrol)
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LEAF(_mcount)
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.set noreorder
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.set noat
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addu sp, sp, 8 # undo push
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j ra
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move ra, AT
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.set at
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.set reorder
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END(_mcount)
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#endif
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