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|
/* SPDX-License-Identifier: BSD-2-Clause */
/* entry.s
*
* This file contains the entry point for the application.
* The name of this entry point is compiler dependent.
* It jumps to the BSP which is responsible for performing
* all initialization.
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <rtems/asm.h>
#if (M68K_COLDFIRE_ARCH == 0) /* All ColdFire BSPs must provide their own start vector */
BEGIN_CODE
| Default entry points for:
PUBLIC (start) | GNU
PUBLIC (M68Kvec) | Vector Table
SYM (start):
SYM (M68Kvec): | standard location for vectors
nop | for linkers with problem
| location zero
jmp SYM (start_around)
/*
* We can use the following space as our vector table
* if the CPU has a VBR or we can save vector table in it
* if the CPU does not.
*/
.space 4088 | to avoid initial intr stack
| from 135BUG on MVME13?
| and start code at 0x4000
SYM (vectors):
.space 1016 | reserve space for rest of vectors
#if ( M68K_HAS_SEPARATE_STACKS == 1 )
SYM (lowintstack):
.space 4092 | reserve for interrupt stack
SYM (hiintstack):
.space 4 | end of interrupt stack
#endif
PUBLIC (start_around)
SYM (start_around):
move.w sr, SYM (initial_sr)
oriw #0x3700,sr | SUPV MODE,INTERRUPTS OFF!!!
#if ( M68K_HAS_SEPARATE_STACKS == 1 )
movec isp,a0
move.l a0, SYM (initial_isp)
movec usp,a0
move.l a0, SYM (initial_usp)
movec msp,a0
move.l a0, SYM (initial_msp)
#else
move.l a7, SYM (initial_msp)
#endif
|
| zero out uninitialized data area
|
zerobss:
moveal # SYM (bsp_section_bss_end),a0 | find end of .bss
moveal # SYM (bsp_section_bss_begin),a1 | find beginning of .bss
movel #0,d0
loop: movel #0,a1@+ | to zero out uninitialized
cmpal a0,a1
jlt loop | loop until _end reached
movel # SYM (_ISR_Stack_area_end),d0 | d0 = stop of stack
movw #0x3700,sr | SUPV MODE,INTERRUPTS OFF!!!
movel d0,a7 | set master stack pointer
movel d0,a6 | set base pointer
/*
* RTEMS should maintain a separate interrupt stack on CPUs
* without one in hardware. This is currently not supported
* on versions of the m68k without a HW intr stack.
*/
#if ( M68K_HAS_SEPARATE_STACKS == 1 )
lea SYM (hiintstack),a0 | a0 = high end of intr stack
movec a0,isp | set interrupt stack
#endif
movel #0,a7@- | push command line
jsr SYM (boot_card)
addl #12,a7
#if ( M68K_HAS_SEPARATE_STACKS == 1 )
move.l SYM (initial_isp),a0
movec a0,isp
move.l SYM (initial_usp),a0
movec a0,usp
move.l SYM (initial_msp),a0
movec a0,msp
#else
movea.l SYM (initial_msp),a7
#endif
move.w SYM (initial_sr),sr
rts
END_CODE
BEGIN_DATA
PUBLIC (start_frame)
SYM (start_frame):
.space 4,0
END_DATA
BEGIN_BSS
PUBLIC (initial_isp)
SYM (initial_isp):
.space 4
PUBLIC (initial_msp)
SYM (initial_msp):
.space 4
PUBLIC (initial_usp)
SYM (initial_usp):
.space 4
PUBLIC (initial_sr)
SYM (initial_sr):
.space 2
END_DATA
#endif
END
|
