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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [ods68302/] [start/] [debugreset.S] - Blame information for rev 773

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/*
 *  $Id: debugreset.S,v 1.2 2001-09-27 12:00:21 chris Exp $
 *
 *  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.
 *
 */
 
|
| 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
 
 

Line No.	Rev	Author	Line
1	30	unneback	`/*`
2			`* $Id: debugreset.S,v 1.2 2001-09-27 12:00:21 chris Exp $`
3			`*`
4			`* Re-written the gen68302 start-up code.`
5			`*`
6			`* Uses gas syntax only, removed the OAR asm.h.`
7			`*`
8			`* Supplies a complete vector table in ROM.`
9			`*`
10			`* Manages all vectors with seperate handlers to trap unhandled`
11			`* execptions.`
12			`*`
13			`* Uses the target specific header file to get the runtime`
14			`* configuration`
15			`*`
16			`* COPYRIGHT (c) 1996`
17			`* Objective Design Systems Pty Ltd (ODS)`
18			`*`
19			`* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.`
20			`* On-Line Applications Research Corporation (OAR).`
21			`* All rights assigned to U.S. Government, 1994.`
22			`*`
23			`* This material may be reproduced by or for the U.S. Government pursuant`
24			`* to the copyright license under the clause at DFARS 252.227-7013. This`
25			`* notice must appear in all copies of this file and its derivatives.`
26			`*`
27			`*/`
28
29			`\|`
30			`\| Entry from debugger`
31			`\|`
32			`.sect .text`
33
34			`\|`
35			`\| Start`
36			`\|`
37			`\| Entered from a hardware reset.`
38			`\|`
39
40			`.global start \| Default entry point for GNU`
41			`start:`
42
43			`move.w #0x2700,%sr \| Disable all interrupts`
44
45			`\|`
46			`\| zero out uninitialized data area`
47			`\|`
48
49			`zerobss:`
50			`moveal #_clear_end,%a0 \| find end of .bss`
51			`moveal #_clear_start,%a1 \| find beginning of .bss`
52			`moveq #0,%d0`
53
54			`zerobss_loop:`
55
56			`movel %d0,%a1@+ \| to zero out uninitialized`
57			`cmpal %a0,%a1`
58			`jlt zerobss_loop \| loop until end reached`
59
60			`movel %d0,_stack_init \| load stack top`
61
62			`movw #0x3700,%sr \| SUPV MODE,INTERRUPTS OFF!!!`
63			`movel %d0,%a7 \| set master stack pointer`
64			`movel %d0,%a6 \| set base pointer`
65
66			`jsr boot_phase_3`
67
68			`\|`
69			`\| Initialised data`
70			`\|`
71
72			`.sect .data`
73
74			`.global start_frame`
75
76			`start_frame:`
77			`.space 4,0`
78
79			`\|`
80			`\| Uninitialised data`
81			`\|`
82
83			`.sect .bss`
84
85			`.global environ`
86			`.align 2`
87
88			`environ:`
89			`.long 0`
90
91			`.global heap_size`
92			`.set heap_size,0x2000`
93
94			`.global stack_size`
95			`.set stack_size,0x1000`
96
97

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [ods68302/] [start/] [debugreset.S] - Blame information for rev 773