1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
##==============================================================================
##
## crt0.S
##
## MN10200 startup code
##
##==============================================================================
##
## Copyright (c) 1995, 1996, 1997, 1998 Cygnus Solutions
##
## The authors hereby grant permission to use, copy, modify, distribute,
## and license this software and its documentation for any purpose, provided
## that existing copyright notices are retained in all copies and that this
## notice is included verbatim in any distributions. No written agreement,
## license, or royalty fee is required for any of the authorized uses.
## Modifications to this software may be copyrighted by their authors
## and need not follow the licensing terms described here, provided that
## the new terms are clearly indicated on the first page of each file where
## they apply.
##
##------------------------------------------------------------------------------
.file "crt0.S"
##------------------------------------------------------------------------------
## Startup code
.section .text
.global _start
_start:
mov _stack,a3 # Load up the stack pointer and allocate
# our current frame.
mov _edata,a0 # Get the start/end of bss
mov _end,a1
cmp a0,a1 # If no bss, then do nothing
beqx .L0
sub d0,d0 # clear d0
.L1:
movb d0,(a0) # Clear a byte and bump pointer
add 1,a0
cmp a0,a1
bnex .L1
.L0:
jsr ___main
sub d0,d0
mov d0,d1
mov d0,(a3)
jsr _main # Call main program
jmp _exit # All done, no need to return or
# deallocate our stack.
.section .stack
_stack: .long 1
|
