|
Last change
on this file since 661 was
444,
checked in by satin@…, 7 years ago
|
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
|
File size:
1.8 KB
|
| Line | |
|---|
| 1 | ##============================================================================== |
|---|
| 2 | ## |
|---|
| 3 | ## crt0-eval.S |
|---|
| 4 | ## |
|---|
| 5 | ## MN10300 Series Evaluation Board C startup code |
|---|
| 6 | ## |
|---|
| 7 | ##============================================================================== |
|---|
| 8 | ######COPYRIGHTBEGIN#### |
|---|
| 9 | ## |
|---|
| 10 | ## Copyright (c) 1995, 1996, 1997, 1998 Cygnus Solutions |
|---|
| 11 | ## |
|---|
| 12 | ## The authors hereby grant permission to use, copy, modify, distribute, |
|---|
| 13 | ## and license this software and its documentation for any purpose, provided |
|---|
| 14 | ## that existing copyright notices are retained in all copies and that this |
|---|
| 15 | ## notice is included verbatim in any distributions. No written agreement, |
|---|
| 16 | ## license, or royalty fee is required for any of the authorized uses. |
|---|
| 17 | ## Modifications to this software may be copyrighted by their authors |
|---|
| 18 | ## and need not follow the licensing terms described here, provided that |
|---|
| 19 | ## the new terms are clearly indicated on the first page of each file where |
|---|
| 20 | ## they apply. |
|---|
| 21 | ## |
|---|
| 22 | ######COPYRIGHTEND#### |
|---|
| 23 | |
|---|
| 24 | ##------------------------------------------------------------------------------ |
|---|
| 25 | |
|---|
| 26 | .file "crt0-eval.S" |
|---|
| 27 | |
|---|
| 28 | ##------------------------------------------------------------------------------ |
|---|
| 29 | ## Startup code |
|---|
| 30 | |
|---|
| 31 | .equ DRAM_TOP,0x48100000 |
|---|
| 32 | |
|---|
| 33 | .text |
|---|
| 34 | |
|---|
| 35 | .globl __start |
|---|
| 36 | __start: |
|---|
| 37 | # Set up stack. Leave 4K at top for use by Cygmon. |
|---|
| 38 | |
|---|
| 39 | mov DRAM_TOP - 0x1000,a0 |
|---|
| 40 | sub 8,a0 |
|---|
| 41 | mov a0,sp |
|---|
| 42 | |
|---|
| 43 | # Clear BSS |
|---|
| 44 | |
|---|
| 45 | mov __bss_start,a0 |
|---|
| 46 | mov _end,a1 |
|---|
| 47 | |
|---|
| 48 | cmp a0,a1 |
|---|
| 49 | beq 8f |
|---|
| 50 | clr d0 |
|---|
| 51 | 1: |
|---|
| 52 | movbu d0,(a0) |
|---|
| 53 | inc a0 |
|---|
| 54 | cmp a0,a1 |
|---|
| 55 | bne 1b |
|---|
| 56 | 8: |
|---|
| 57 | # Call constructors |
|---|
| 58 | |
|---|
| 59 | .extern ___main |
|---|
| 60 | call ___main,[],0 |
|---|
| 61 | |
|---|
| 62 | # Call main |
|---|
| 63 | clr d0 |
|---|
| 64 | clr d1 |
|---|
| 65 | mov d0,(4,sp) |
|---|
| 66 | |
|---|
| 67 | 9: |
|---|
| 68 | or 0x0800,psw # Enable interrupts |
|---|
| 69 | |
|---|
| 70 | .extern _main |
|---|
| 71 | call _main,[],0 |
|---|
| 72 | |
|---|
| 73 | .extern __exit |
|---|
| 74 | call __exit,[],0 |
|---|
| 75 | |
|---|
| 76 | # bra 9b # Loop if we return |
|---|
| 77 | |
|---|
| 78 | |
|---|
| 79 | |
|---|
| 80 | ##------------------------------------------------------------------------------ |
|---|
| 81 | ## end of crt0-eval.S |
|---|
| 82 | |
|---|
Note: See
TracBrowser
for help on using the repository browser.
