begin.S revision d7daacb46372132ae3f0121647074936c304b572 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29    .text
30    .align    4
31    .type    __start,@function
32
33    .ent    __start
34    .globl    __start
35__start:
36    .set    noreorder
37    bal    1f
38    nop
391:  .cpload    $31
40    .set    reorder
41
42    /* Discover the load address */
43    la    $t0, 1f
44    bal    1f
451:  subu    $t0, $ra, $t0
46
47#define DT_PLTGOT 3
48#define DT_MIPS_LOCAL_GOTNO 0x7000000a
49
50    /* Search dynamic table for DT_MIPS_LOCAL_GOTNO and DT_PLTGOT values */
51    la    $t1, _DYNAMIC
52    addu    $t1, $t0
53    li    $t3, DT_PLTGOT
54    li    $t4, DT_MIPS_LOCAL_GOTNO
550:
56    lw    $t2, 0($t1)
57    beqz    $t2, .Lrelocate_local_got
58
59    bne    $t2, $t3, 1f    /* DT_PLTGOT? */
60    lw    $s0, 4($t1)
61    addu    $s0, $t0
62    b    2f
63
641:  bne    $t2, $t4, 1f    /* DT_MIPS_LOCAL_GOTNO? */
65    lw    $s1, 4($t1)
66    b    2f
67
681:
692:  addu    $t1, 8
70    b    0b
71
72.Lrelocate_local_got:
73    /*
74     * Relocate the local GOT entries
75     * got[0] is address of lazy resolver function
76     * got[1] may be used for a GNU extension
77     */
78
79    addu    $s0, 4
80    subu    $s1, 1
81    lw    $t1, ($s0)
82    bgez    $t1, 9f
83    addu    $s0, 4
84    subu    $s1, 1
85    b    9f
86
871:  lw    $t1, ($s0)
88    addu    $t1, $t0
89    sw    $t1, ($s0)
90    addu    $s0, 4
919:  subu    $s1, 1
92    bgez    $s1, 1b
93
94    /* call linker_init */
95    move    $a0, $sp
96    addiu    $sp, -4*4        /* space for arg saves in linker_init */
97    la    $t9, __linker_init
98    jalr    $t9
99    move    $t9, $v0
100    addu    $sp, 4*4        /* restore sp */
101    j    $t9
102    .end    __start
103
104    .section .ctors, "wa"
105    .globl __CTOR_LIST__
106__CTOR_LIST__:
107    .long -1
108