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136 lines
3.6 KiB
ArmAsm
136 lines
3.6 KiB
ArmAsm
/* Copyright (C) 1994, 1997 Free Software Foundation, Inc.
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Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
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On-Line Applications Research Corporation.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* entry.s
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*
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* This file contains the entry point for the application.
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* The name of this entry point is compiler dependent.
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* It jumps to the BSP which is responsible for performing
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* all initialization.
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*
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*/
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.text
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.globl start # GNU960 default entry point
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start:
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mov 3, r12
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modpc r12, r12, r12 # enable tracing/trace faults
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mov g5, g5 # NOP
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mov 0, g14 # initialize constant for C
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/*
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* zero out uninitialized data area
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*/
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zerobss:
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lda _end, r4 /* find end of .bss */
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lda _bss_start, r5 /* find beginning of .bss */
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ldconst 0, r6
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loop: st r6, (r5) /* to zero out uninitialized */
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addo 4, r5, r5 /* data area */
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cmpobl r5, r4, loop /* loop until _end reached */
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lda heap_memory, r12 /* tell C lib where heap is */
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st r12,___C_heap_start
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lda heap_size, r12 /* tell C lib how big heap is */
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st r12,___C_heap_size
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lda stack_memory,r12 /* set up stack pointer: */
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mov r12, sp
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mov 0, g14 /* initialize constant for C */
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call init_frames
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ret /* return to monitor */
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init_frames:
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ldconst 0x3b001000, g0
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ldconst 0x00009107, g1
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modac g1, g0, g0 /* set AC controls */
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/*
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* Call application mainline.
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* Someday, real values of argc and argv will be set up.
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* For now, they are set to 0.
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*/
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callx __Board_Initialize /* Initialize the board */
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ldconst 0,g0
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ldconst 0,g1
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ldconst 0,g2
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callx ___libc_init /* initialize the library and */
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/* call main */
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/*
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* if we return from main, we have "fallen" off the end
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* of the program, therefore status is 0
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* so move 0 to g0 (exit parameter)
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*/
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mov 0, g0
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callx __exit
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ret
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/*
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* Data Declarations. Start with a macro which helps declare space.
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*/
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#define DECLARE_SPACE(_name,_space,_align) \
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.globl _name ; \
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.align _align ; \
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.comm _name##,_space
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#define DECLARE_LABEL(_name) \
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.globl _name ; \
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_name##:
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#define DECLARE_PTR(_name) DECLARE_SPACE(_name,4,2)
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#define DECLARE_U32(_name) DECLARE_SPACE(_name,4,2)
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#define DECLARE_U16(_name) DECLARE_SPACE(_name,2,1)
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/*
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* Require environment stuff
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*/
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DECLARE_LABEL(_environ)
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DECLARE_PTR(environ)
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DECLARE_LABEL(_errno)
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DECLARE_U32(errno)
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/*
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* Stack Size and Space
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*/
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.set stack_size, 0x20000
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DECLARE_SPACE(stack_memory,stack_size,4)
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DECLARE_LABEL(stack_end)
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/*
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* Heap Size and Space
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*/
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.set heap_size, 0x20000
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DECLARE_SPACE(heap_memory,heap_size,4)
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DECLARE_LABEL(heap_end)
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