source: trunk/libs/newlib/src/libgloss/m68k/cf-crt0.S @ 532

Last change on this file since 532 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 1.5 KB
Line 
1/* Initial boot
2 *
3 * Copyright (c) 2006 CodeSourcery Inc
4 *
5 * The authors hereby grant permission to use, copy, modify, distribute,
6 * and license this software and its documentation for any purpose, provided
7 * that existing copyright notices are retained in all copies and that this
8 * notice is included verbatim in any distributions. No written agreement,
9 * license, or royalty fee is required for any of the authorized uses.
10 * Modifications to this software may be copyrighted by their authors
11 * and need not follow the licensing terms described here, provided that
12 * the new terms are clearly indicated on the first page of each file where
13 * they apply.
14 */
15
16        #include "asm.h"       
17        .text
18
19        .extern __stack
20        .extern __heap_end
21        .weak __heap_end
22        .extern __start1
23
24        /* __reset should cause a HALT in a hosted executable and
25           fall into __start for an unhosted executable.  The user is
26           free to override this with their own declaration.  */
27        .globl __reset
28        .weak __reset
29__reset:       
30#if HOSTED
31        HALT
32#endif
33       
34        .globl __start
35__start:
36        /* Initialize stack */
37        move.l IMM(__stack), sp
38        move.l IMM(0), fp
39        move.l IMM(__heap_end), d1
40#if HOSTED
41        /* INIT_SIM syscall.  Allows changing sp & d1.  */
42        move.l IMM(1),d0
43
44        /* The semihosting sequence is 'nop; halt;sentinel' aligned to
45           a 4 byte boundary.  The sentinel is an ill formed instruction
46           (movec %sp,0).  The debugger will adjust the pc, so it is never
47            executed.  */
48        .balignw 4,0x4e71
49        nop
50        halt
51        .long 0x4e7bf000
52#endif
53        move.l d1,sp@-
54        move.l fp,sp@-  /* Dummy return address */
55        jmp __start1
56
Note: See TracBrowser for help on using the repository browser.