source: rtems/c/src/lib/start/sh/start.s @ f8b27df9

4.104.114.84.95
Last change on this file since f8b27df9 was f8b27df9, checked in by Joel Sherrill <joel.sherrill@…>, on Mar 20, 1998 at 5:20:45 PM

New port from Ralf Corsepius <corsepiu@…>.

  • Property mode set to 100644
File size: 1.6 KB
Line 
1/*
2 *  Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de) and
3 *           Bernd Becker (becker@faw.uni-ulm.de)
4 *
5 *  COPYRIGHT (c) 1997-1998, FAW Ulm, Germany
6 *
7 *  This program is distributed in the hope that it will be useful,
8 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
9 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
10 *
11 *
12 *  COPYRIGHT (c) 1998.
13 *  On-Line Applications Research Corporation (OAR).
14 *  Copyright assigned to U.S. Government, 1994.
15 *
16 *  The license and distribution terms for this file may be
17 *  found in the file LICENSE in this distribution or at
18 *  http://www.OARcorp.com/rtems/license.html.
19 *
20 *  $Id$
21 */
22
23#include "asm.h"
24
25        BEGIN_CODE
26        PUBLIC(start)
27SYM (start):
28        ! install the stack pointer
29        mov.l   stack_k,r15
30
31        ! zero out bss
32        mov.l   edata_k,r0
33        mov.l   end_k,r1
34        mov     #0,r2
35start_l:
36        mov.l   r2,@r0
37        add     #4,r0
38        cmp/ge  r0,r1
39        bt      start_l
40
41        ! copy the vector table from rom to ram
42        mov.l   vects_k,r7      ! vectab
43        mov     #0,r2           ! address of boot vector table
44        mov     #0,r3           | number of bytes copied
45        mov.w   vects_size,r6   ! size of entries in vectab
460:
47        mov.l   @r2+,r1
48        mov.l   r1,@r7
49        add     #4,r7
50        add     #1,r3
51        cmp/hi  r6,r3
52        bf      0b
53
54        mov.l   vects_k,r8      ! update vbr to point to vectab
55        ldc     r8,vbr
56
57        ! call the mainline     
58        mov.l   main_k,r0
59        jsr     @r0
60        or      r0,r0
61
62        ! call exit
63        mov     r0,r4
64        mov.l   exit_k,r0
65        jsr     @r0
66        or      r0,r0
67
68        END_CODE
69
70        .align 2
71stack_k:
72        .long   _stack 
73edata_k:
74        .long   _edata
75end_k:
76        .long   _end
77main_k:
78        .long   _main
79exit_k:
80        .long   _exit
81
82vects_k:
83        .long   _vectab
84vects_size:
85        .word   255
86
87#ifdef __ELF__
88        .section .stack,"aw"
89#else
90        .section .stack
91#endif
92_stack: .long   0xdeaddead
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