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start.S @ 858ea06c

4.104.115

Last change on this file since 858ea06c was 858ea06c, checked in by Joel Sherrill <joel.sherrill@…>, on 11/20/08 at 15:39:04

2008-11-20 Joel Sherrill <joel.sherrill@…>

.cvsignore, ChangeLog?, Makefile.am, README, bsp_specs, configure.ac, preinstall.am, console/console-io.c, include/.cvsignore, include/bsp.h, start/start.S, startup/linkcmds, tools/.cvsignore, tools/Makefile.am, tools/configure.ac, tools/runtest.in: New files.

File size: 1.2 KB

Line
1
2	#define SPL 0x3d
3	#define SPH 0x3e
4	#define SREG 0x3f
5	#define RAMPZ 0x3b
6
7	#define RAMEND (64 * 1024)
8
9	/*
10	.weak __stack
11	.set __stack, RAMEND - 1
12	*/
13
14	.weak __heap_end
15	.set __heap_end, 0
16
17
18	.section .vectors,"ax",@progbits
19	.global __vectors
20	.func __vectors
21	__vectors:
22	__reset:
23	jmp __init
24	.endfunc
25
26	.section .init0,"ax",@progbits
27	.weak __init
28	; .func __init
29	__init:
30
31	.section .init2,"ax",@progbits
32	clr r1
33	out 0x3f, r1
34	ldi r28,lo8(__stack)
35	ldi r29,hi8(__stack)
36	out SPH, r29
37	out SPL, r28
38
39	/* Only for >64K devices with RAMPZ, replaces the default code
40	provided by libgcc.S which is only linked in if necessary. */
41
42	.section .init4,"ax",@progbits
43	.global __do_copy_data
44	__do_copy_data:
45	.global __do_clear_bss
46	__do_clear_bss:
47	#if 0
48	ldi r17, hi8(__data_end)
49
50	ldi r26, lo8(__data_start)
51	ldi r27, hi8(__data_start)
52
53	ldi r30, lo8(__data_load_start)
54	ldi r31, hi8(__data_load_start)
55	ldi r16, hh8(__data_load_start)
56	out RAMPZ, r16
57
58	0:
59	cpi r26, lo8(__data_end)
60	cpc r27, r17
61	breq 1f
62
63	elpm r0, Z+
64	st X+, r0
65	rjmp 0b
66	1:
67	#endif
68
69	.section .init9,"ax",@progbits
70	call boot_card
71	jmp exit
72	; .endfunc
73
74	.global exit
75	.func exit
76	exit: out 0x2f, r0
77	.endfunc
78
79	.global abort
80	.func abort
81	abort: out 0x29, r0
82	.endfunc

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