source: trunk/libs/newlib/src/libgloss/microblaze/linux-crt0.S @ 478

Last change on this file since 478 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
RevLine 
[444]1/* linux-crt0 -- Startup routines for the Linux BSP.
2 *
3 * Copyright (c) 2011 Edgar E. Iglesias
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        .section .text
17        .globl _start
18        .ent _start
19        .type _start, @function
20_start:
21        la      r13, r0, _SDA_BASE_
22        la      r2, r0, _SDA2_BASE_
23
24        brlid   r15, __init
25        nop
26
27        lwi     r5, r1, 0
28        addik   r6, r1, 4
29
30        # Add argc * 4.
31        addk    r7, r5, r5
32        addk    r7, r7, r7
33
34        brlid   r15, main
35        # Now add 4 + r1 (i.e r6) in the delayslot.
36        addk    r7, r7, r6
37
38        brlid   r15, exit
39        addik   r5, r3, 0
40        .size _start, . - _start
41        .end _start
42
43        /* Replacement for the GCC provided crti.S. This one avoids the
44           setup of stack protection regs (which result in privilieged
45           insn exceptions when running in user-space).  */
46        .section .init, "ax"
47        .global __init
48        .align 2
49__init:
50        addik   r1, r1, -8
51        sw      r15, r0, r1
52
53        .section .fini, "ax"
54        .global __fini
55        .align 2
56__fini:
57        addik   r1, r1, -8
58        sw      r15, r0, r1
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