/*
* $Id$
*
* Re-written the gen68302 start-up code.
*
* Uses gas syntax only, removed the OAR asm.h.
*
* Supplies a complete vector table in ROM.
*
* Manages all vectors with seperate handlers to trap unhandled
* execptions.
*
* Uses the target specific header file to get the runtime
* configuration
*
* COPYRIGHT (c) 1996
* Objective Design Systems Pty Ltd (ODS)
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
* All rights assigned to U.S. Government, 1994.
*
* This material may be reproduced by or for the U.S. Government pursuant
* to the copyright license under the clause at DFARS 252.227-7013. This
* notice must appear in all copies of this file and its derivatives.
*
*/
#define STACK_AT_RESET 0x0
|
| Boot boot code in a special section, ld postions
|
| Initial stack pointer is in the dual ported RAM
|
.sect .text
.global _start | program entry
.global M68Kvec | Vector Table
_start: | standard name for program entry
M68Kvec: | standard location for vectors
|
| Make relative, can have the code positioned any where
|
V___ISSP: .long STACK_AT_RESET
V____IPC: .long start - V___ISSP
|
| Create the rest of the vector table to point to the unhandled expection
| handler
|
| Lots of macros, how-ever it creates a simple ROM vector table
|
#if !defined(mcpu32)
.space 1016 | reserve space for rest of vectors
#else
#define MAKE_EXCEPTION_VECTOR(n) V___##n: .long (_CPU_ISR_jump_table + (n * 10))
MAKE_EXCEPTION_VECTOR(2)
MAKE_EXCEPTION_VECTOR(3)
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MAKE_EXCEPTION_VECTOR(5)
MAKE_EXCEPTION_VECTOR(6)
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MAKE_EXCEPTION_VECTOR(252)
MAKE_EXCEPTION_VECTOR(253)
MAKE_EXCEPTION_VECTOR(254)
MAKE_EXCEPTION_VECTOR(255)
#endif
|
| Start
|
| Entered from a hardware reset.
|
.global start | Default entry point for GNU
start:
|
| Copy initialized data area from ROM to RAM
|
copy_data:
moveal #_etext,%a0 | find the end of .text
moveal #_copy_start,%a1 | find the beginning of .data
moveal #_edata,%a2 | find the end of .data
copy_data_loop:
movel %a0@+,%a1@+ | copy the data
cmpal %a2,%a1
jlt copy_data_loop | loop until edata reached
|
| zero out uninitialized data area
|
zerobss:
moveal #_clear_end,%a0 | find end of .bss
moveal #_clear_start,%a1 | find beginning of .bss
moveq #0,%d0
zerobss_loop:
movel %d0,%a1@+ | to zero out uninitialized
cmpal %a0,%a1
jlt zerobss_loop | loop until _end reached
movel #_stack_init,%d0 | load stack top
movw #0x3700,%sr | SUPV MODE,INTERRUPTS OFF!!!
movel %d0,%a7 | set master stack pointer
movel %d0,%a6 | set base pointer
pea env | push environp
pea arg | push argv
movel #0,%a7@- | push argc
jsr boot_card
| if this returns, what do we do???
.global bsp_exitted
bsp_exitted:
jmp bsp_exitted
|
| Initialised data
|
.sect .data
|
| Uninitialised data
|
.sect .bss
env: .long 0
arg: .long 0
.global environ
.align 2
environ:
.long env
