source: trunk/libs/newlib/src/libgloss/microblaze/crt1.S @ 476

Last change on this file since 476 was 444, checked in by satin@…, 6 years ago

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

File size: 3.5 KB
Line 
1/* Copyright (c) 2001, 2009 Xilinx, Inc.  All rights reserved.
2   
3   Redistribution and use in source and binary forms, with or without
4   modification, are permitted provided that the following conditions are
5   met:
6   
7   1.  Redistributions source code must retain the above copyright notice,
8   this list of conditions and the following disclaimer.
9   
10   2.  Redistributions in binary form must reproduce the above copyright
11   notice, this list of conditions and the following disclaimer in the
12   documentation and/or other materials provided with the distribution.
13   
14   3.  Neither the name of Xilinx nor the names of its contributors may be
15   used to endorse or promote products derived from this software without
16   specific prior written permission.
17   
18   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS
19   IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20   TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
21   PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22   HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
24   TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 
30       
31        MicroBlaze Vector Map for standalone executables
32        downloaded and executed with XMDSTUB
33
34         Address                Vector type                 Label
35         -------                -----------                 ------       
36       
37        # 0x00 #                (-- IMM --)
38        # 0x04 #                Reset                       (-- Don't Care --)
39   
40        # 0x08 #                (-- IMM --)
41        # 0x0c #                Software Exception          _exception_handler
42   
43        # 0x10 #                (-- IMM --)
44        # 0x14 #                Hardware Interrupt          _interrupt_handler
45   
46        # 0x18 #                (-- IMM --)
47        # 0x1C #                Breakpoint Exception        (-- Don't Care --)
48   
49        # 0x20 #                (-- IMM --)
50        # 0x24 #                Hardware Exception          _hw_exception_handler
51
52*/     
53   
54
55        .section .vectors.sw_exception, "ax"
56        .align 2
57_vector_sw_exception:       
58        brai    _exception_handler
59
60        .section .vectors.interrupt, "ax"
61        .align 2
62_vector_interrupt:     
63        brai    _interrupt_handler
64
65        .section .vectors.hw_exception, "ax"
66        .align 2
67_vector_hw_exception:       
68        brai    _hw_exception_handler
69
70        .section .text
71        .globl _start
72        .align 2
73        .ent _start
74        .type _start, @function   
75_start:
76        la      r13, r0, _SDA_BASE_         /* Set the Small Data Anchors and the stack pointer */
77        la      r2, r0, _SDA2_BASE_
78        la      r1, r0, _stack-16           /* 16 bytes (4 words are needed by crtinit for args and link reg */
79
80        brlid   r15, _crtinit               /* Initialize BSS and run program */
81        nop
82
83        brlid   r15, exit                   /* Call exit with the return value of main */
84        addik   r5, r3, 0                   
85
86        /* Control does not reach here */
87        .end _start   
88
89   
90/*
91        _exit
92        Our simple _exit     
93*/   
94        .globl _exit
95        .align 2
96        .ent _exit
97        .type _exit, @function
98_exit:
99        add     r3, r0, r5
100        brki    r16, 0x4                    /* Return to hook in XMDSTUB  */   
101        .end _exit       
102
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