URL https://opencores.org/ocsvn/eco32/eco32/trunk

Subversion Repositories eco32

[/] [eco32/] [trunk/] [stdalone/] [hello2/] [start.s] - Blame information for rev 67

Go to most recent revision | Details | Compare with Previous | View Log


;
; start.s -- startup code
;
 
        .import main
        .import _ecode
        .import _edata
        .import _ebss
 
        .export _bcode
        .export _bdata
        .export _bbss
 
        .code
_bcode:
 
        .data
_bdata:
 
        .bss
_bbss:
 
        .code
 
        ; reset arrives here
reset:
        j       start
 
        ; interrupts arrive here
intrpt:
        j       intrpt
 
        ; user TLB misses arrive here
userMiss:
        j       userMiss
 
start:
        mvfs    $8,0
        or      $8,$8,1 << 27   ; let vector point to RAM
        mvts    $8,0
        add     $29,$0,stack     ; set sp
        add     $10,$0,_bdata    ; copy data segment
        add     $8,$0,_edata
        sub     $9,$8,$10
        add     $9,$9,_ecode
        j       cpytest
cpyloop:
        ldw     $11,$9,0
        stw     $11,$8,0
cpytest:
        sub     $8,$8,4
        sub     $9,$9,4
        bgeu    $8,$10,cpyloop
        add     $8,$0,_bbss      ; clear bss
        add     $9,$0,_ebss
        j       clrtest
clrloop:
        stw     $0,$8,0
        add     $8,$8,4
clrtest:
        bltu    $8,$9,clrloop
        jal     main            ; call 'main'
start1:
        j       start1          ; loop
 
        .bss
 
        .align  4
        .space  0x800
stack:

Line No.	Rev	Author	Line
1	18	hellwig	`;`
2			`; start.s -- startup code`
3			`;`
4
5			`.import main`
6			`.import _ecode`
7			`.import _edata`
8			`.import _ebss`
9
10			`.export _bcode`
11			`.export _bdata`
12			`.export _bbss`
13
14			`.code`
15			`_bcode:`
16
17			`.data`
18			`_bdata:`
19
20			`.bss`
21			`_bbss:`
22
23			`.code`
24
25			`; reset arrives here`
26			`reset:`
27			`j start`
28
29			`; interrupts arrive here`
30			`intrpt:`
31			`j intrpt`
32
33			`; user TLB misses arrive here`
34			`userMiss:`
35			`j userMiss`
36
37			`start:`
38			`mvfs $8,0`
39			`or $8,$8,1 << 27 ; let vector point to RAM`
40			`mvts $8,0`
41			`add $29,$0,stack ; set sp`
42			`add $10,$0,_bdata ; copy data segment`
43			`add $8,$0,_edata`
44			`sub $9,$8,$10`
45			`add $9,$9,_ecode`
46			`j cpytest`
47			`cpyloop:`
48			`ldw $11,$9,0`
49			`stw $11,$8,0`
50			`cpytest:`
51			`sub $8,$8,4`
52			`sub $9,$9,4`
53			`bgeu $8,$10,cpyloop`
54			`add $8,$0,_bbss ; clear bss`
55			`add $9,$0,_ebss`
56			`j clrtest`
57			`clrloop:`
58			`stw $0,$8,0`
59			`add $8,$8,4`
60			`clrtest:`
61			`bltu $8,$9,clrloop`
62			`jal main ; call 'main'`
63			`start1:`
64			`j start1 ; loop`
65
66			`.bss`
67
68			`.align 4`
69			`.space 0x800`
70			`stack:`

Browse

Tools

Subversion Repositories eco32

[/] [eco32/] [trunk/] [stdalone/] [hello2/] [start.s] - Blame information for rev 67