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156 lines
5.0 KiB
ArmAsm
156 lines
5.0 KiB
ArmAsm
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/* Copyright (C) 1994 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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, 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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.text
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.globl start | Default entry point
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.globl _start | Default entry point
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.globl M68Kvec | Vector Table
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.globl _M68Kvec | Vector Table
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start:
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_start:
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M68Kvec: | standard location for vectors
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_M68Kvec: | standard location for vectors
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nop | for linkers with problem
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| using location zero as entry
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jmp around
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.space 4088 | to avoid initial intr stack
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| from 135BUG on MVME13? as entry
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| and start code at 0x4000
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around:
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move.w %sr,initial_sr | save initial values
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movec %isp,%a0
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movel %a0,initial_isp
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movec %usp,%a0
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movel %a0,initial_usp
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movec %msp,%a0
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movel %a0,initial_msp
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oriw #0x0700,%sr | INTERRUPTS OFF!!!
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| zero out uninitialized data area
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zerobss:
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moveal #end,%a0 | find end of .bss
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moveal #_bss_start,%a1 | find beginning of .bss
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movel #0,%d0
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loop: movel #0,%a1@+ | to zero out uninitialized
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cmpal %a0,%a1
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jlt loop | loop until _end reached
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movel #heap_size,__C_heap_size | set ___C_heap_size
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movel #heap_memory,__C_heap_start | set ___C_heap_start
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moveal #interrupt_stack_end,%a0 | set interrupt stack pointer
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movec %a0,%isp
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moveal #stack_end,%a0 | set master stack pointer
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movec %a0,%msp
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moveal #stack_end,%a6 | set base pointer
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movw #0x3000,%sr | SUPV MODE,INTERRUPTS ON!!!
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#ifdef NEED_UNDERSCORES
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jsr __Board_Initialize | initialize the board
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#else
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jsr _Board_Initialize | initialize the board
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#endif
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move.l #0,%sp@- | envp = NULL
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move.l #0,%sp@- | argv = NULL
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move.l #0,%sp@- | argc = NULL
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#ifdef NEED_UNDERSCORES
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jsr ___libc_init | initialize the library and
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| call main
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#else
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jsr __libc_init | initialize the library and
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| call main
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#endif
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add.l #12,%sp
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move.l #0,%sp@- | argc = NULL
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jsr __exit | call the Board specific exit
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addq.l #4,%sp
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move.l initial_isp,%a0 | if __exit returns then we can
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movec %a0,%isp | restore the initial values
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move.l initial_usp,%a0
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movec %a0,%usp
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move.l initial_msp,%a0
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movec %a0,%msp
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move.w initial_sr,%sr
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rts
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.bss
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/*
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* So initial stack registers and status register can be saved.
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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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_name##: .space _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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DECLARE_U32(initial_isp)
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DECLARE_U32(initial_msp)
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DECLARE_U32(initial_usp)
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DECLARE_U16(initial_sr)
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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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DECLARE_SPACE(interrupt_stack_memory,0x1000,4)
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DECLARE_LABEL(interrupt_stack_end)
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