source: trunk/libs/newlib/src/libgloss/iq2000/crt0.S @ 610

Last change on this file since 610 was 444, checked in by satin@…, 6 years ago

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

File size: 1.7 KB
RevLine 
[444]1##==============================================================================
2##
3##      crt0.S
4##
5##      IQ2000 startup code
6##
7##==============================================================================
8##
9## Copyright (c) 2000, Cygnus Solutions, A Red Hat Company
10##
11## The authors hereby grant permission to use, copy, modify, distribute,
12## and license this software and its documentation for any purpose, provided
13## that existing copyright notices are retained in all copies and that this
14## notice is included verbatim in any distributions. No written agreement,
15## license, or royalty fee is required for any of the authorized uses.
16## Modifications to this software may be copyrighted by their authors
17## and need not follow the licensing terms described here, provided that
18## the new terms are clearly indicated on the first page of each file where
19## they apply.
20##
21       
22##------------------------------------------------------------------------------
23       
24        .file   "crt0.S"
25
26##------------------------------------------------------------------------------
27## Startup code
28        .section .text
29        .global _start
30_start:
31        lui %29,%hi(__stack)
32        ori %29,%29,%lo(__stack)
33
34        lui %24,%hi(_edata)     # get start of bss
35        ori %24,%24,%lo(_edata)
36
37        lui %25,%hi(_end)       # get end of bss
38        ori %25,%25,%lo(_end)
39
40        beq     %24,%25,.L0     # check if end and start are the same
41                                # do nothing if no bss
42       
43.L1:
44        sb %0,0(%24)            #  clear a byte and bump pointer
45        addi %24,%24,1
46        bne %24,%25,.L1
47        nop
48       
49.L0:
50        jal  _main              # call _main to run ctors/dtors
51        nop
52        xor %4,%4,%4
53        jal main                # call main program
54        xor %5,%5,%5
55        jal exit                # all done, no need to return or
56        or %4,%0,%2             # exit with main's return value
57
58        .section .data
59        .global __dso_handle
60        .weak __dso_handle
61__dso_handle:
62        .long   0
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