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/*  entry.s
 *
 *  This file contains the entry point for the application.
 *  The name of this entry point is compiler dependent.
 *  It jumps to the BSP which is responsible for performing
 *  all initialization.
 *
 *  COPYRIGHT (c) 1989-1999.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id: start.S,v 1.2 2001-09-27 11:59:56 chris Exp $
 */
 
#include "asm.h"
 
        BEGIN_CODE
        PUBLIC(start)                 # GNU960 default entry point
 
SYM(start):
        mov     3, r12
        modpc   r12, r12, r12         # enable tracing/trace faults
        mov     g5, g5                # NOP
        mov     0, g14                # initialize constant for C
 
        /*
         * zero out uninitialized data area
         */
zerobss:
        lda     _end, r4        /* find end of .bss */
        lda     _bss_start, r5  /* find beginning of .bss */
        ldconst 0, r6
 
loop:   st      r6, (r5)        /* to zero out uninitialized */
        addo    4, r5, r5       /* data area                 */
        cmpobl  r5, r4, loop    /* loop until _end reached   */
 
/* set up stack pointer:
 *   The heap will begin at '_end';  its length is 'heap_size'
 *   bytes.  The stack will begin at the first 64-byte-aligned
 *   block after the heap.
 *
 *   A default value of 'heap_size' is set by linking with libnindy.a
 *   The default can be overridden by redefining this symbol at link
 *   time (with a line of the form 'heap_size=XXXX;' in the lnk960
 *   linker specification file; or one of the form
 *   "-defsym heap_size=XXXX" on the gld960 invocation line).
 */
 
        ldconst _end, sp         /* set sp = address of end of heap */
        lda     heap_size(sp),sp
        lda     64(sp), sp       /* Now round up to 64-byte boundary */
        ldconst 0xffffffc0, r12
        and     r12, sp, sp
        st      sp, _stack_start /* Save for brk() routine */
 
        call    init_frames
        ret                      /* return to monitor */
 
init_frames:
        mov     0, g14           /* initialize constant for C */
        ldconst 0x3b001000, g0
        ldconst 0x00009107, g1
        modac   g1, g0, g0       /* set AC controls */
 
        /*
         * remember the frame, so that we can set it up if necessary
         */
 
        st      fp, _start_frame
 
        /*
         * Call application boot_card.
         *      Someday, real values of argc and argv will be set up.
         *      For now, they are set to 0.
         */
        ldconst 0,g0
        ldconst 0,g1
        ldconst 0,g2
        call    _boot_card
        ret
 
END_CODE
 
         BEGIN_DATA
 
        PUBLIC(_start_frame)
        PUBLIC(start_frame)
SYM (_start_frame):
SYM (start_frame):
        .word   0                  # addr of first user frame: for gdb960
 
        PUBLIC(_stack_start)
        PUBLIC(stack_start)
SYM (_stack_start):
SYM (stack_start):
        .word   0                  # addr of first user frame: for gdb960
 
END_DATA
 
BEGIN_BSS
        PUBLIC(heap_size)
        .set    heap_size,0x2000
END_BSS
 
END

Line No.	Rev	Author	Line
1	30	unneback	`/* entry.s`
2			`*`
3			`* This file contains the entry point for the application.`
4			`* The name of this entry point is compiler dependent.`
5			`* It jumps to the BSP which is responsible for performing`
6			`* all initialization.`
7			`*`
8			`* COPYRIGHT (c) 1989-1999.`
9			`* On-Line Applications Research Corporation (OAR).`
10			`*`
11			`* The license and distribution terms for this file may be`
12			`* found in the file LICENSE in this distribution or at`
13			`* http://www.OARcorp.com/rtems/license.html.`
14			`*`
15			`* $Id: start.S,v 1.2 2001-09-27 11:59:56 chris Exp $`
16			`*/`
17
18			`#include "asm.h"`
19
20			`BEGIN_CODE`
21			`PUBLIC(start) # GNU960 default entry point`
22
23			`SYM(start):`
24			`mov 3, r12`
25			`modpc r12, r12, r12 # enable tracing/trace faults`
26			`mov g5, g5 # NOP`
27			`mov 0, g14 # initialize constant for C`
28
29			`/*`
30			`* zero out uninitialized data area`
31			`*/`
32			`zerobss:`
33			`lda _end, r4 /* find end of .bss */`
34			`lda _bss_start, r5 /* find beginning of .bss */`
35			`ldconst 0, r6`
36
37			`loop: st r6, (r5) /* to zero out uninitialized */`
38			`addo 4, r5, r5 /* data area */`
39			`cmpobl r5, r4, loop /* loop until _end reached */`
40
41			`/* set up stack pointer:`
42			`* The heap will begin at '_end'; its length is 'heap_size'`
43			`* bytes. The stack will begin at the first 64-byte-aligned`
44			`* block after the heap.`
45			`*`
46			`* A default value of 'heap_size' is set by linking with libnindy.a`
47			`* The default can be overridden by redefining this symbol at link`
48			`* time (with a line of the form 'heap_size=XXXX;' in the lnk960`
49			`* linker specification file; or one of the form`
50			`* "-defsym heap_size=XXXX" on the gld960 invocation line).`
51			`*/`
52
53			`ldconst _end, sp /* set sp = address of end of heap */`
54			`lda heap_size(sp),sp`
55			`lda 64(sp), sp /* Now round up to 64-byte boundary */`
56			`ldconst 0xffffffc0, r12`
57			`and r12, sp, sp`
58			`st sp, _stack_start /* Save for brk() routine */`
59
60			`call init_frames`
61			`ret /* return to monitor */`
62
63			`init_frames:`
64			`mov 0, g14 /* initialize constant for C */`
65			`ldconst 0x3b001000, g0`
66			`ldconst 0x00009107, g1`
67			`modac g1, g0, g0 /* set AC controls */`
68
69			`/*`
70			`* remember the frame, so that we can set it up if necessary`
71			`*/`
72
73			`st fp, _start_frame`
74
75			`/*`
76			`* Call application boot_card.`
77			`* Someday, real values of argc and argv will be set up.`
78			`* For now, they are set to 0.`
79			`*/`
80			`ldconst 0,g0`
81			`ldconst 0,g1`
82			`ldconst 0,g2`
83			`call _boot_card`
84			`ret`
85
86			`END_CODE`
87
88			`BEGIN_DATA`
89
90			`PUBLIC(_start_frame)`
91			`PUBLIC(start_frame)`
92			`SYM (_start_frame):`
93			`SYM (start_frame):`
94			`.word 0 # addr of first user frame: for gdb960`
95
96			`PUBLIC(_stack_start)`
97			`PUBLIC(stack_start)`
98			`SYM (_stack_start):`
99			`SYM (stack_start):`
100			`.word 0 # addr of first user frame: for gdb960`
101
102			`END_DATA`
103
104			`BEGIN_BSS`
105			`PUBLIC(heap_size)`
106			`.set heap_size,0x2000`
107			`END_BSS`
108
109			`END`

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [i960/] [cvme961/] [start/] [start.S] - Blame information for rev 30