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/*
* $Id$
*
* 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).
*
*/
|
| Entry from debugger
|
.sect .text
|
| Start
|
| Entered from a hardware reset.
|
.global start | Default entry point for GNU
start:
move.w #0x2700,%sr | Disable all interrupts
|
| 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 %d0,_stack_init | load stack top
movw #0x3700,%sr | SUPV MODE,INTERRUPTS OFF!!!
movel %d0,%a7 | set master stack pointer
movel %d0,%a6 | set base pointer
jsr boot_phase_3
|
| Initialised data
|
.sect .data
.global start_frame
start_frame:
.space 4,0
|
| Uninitialised data
|
.sect .bss
.global environ
.align 2
environ:
.long 0
.global heap_size
.set heap_size,0x2000
.global stack_size
.set stack_size,0x1000
|
