1 /*
2 * Copyright (C) 2013 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 #include <stddef.h>
30 #include <stdint.h>
31 #include <sys/cdefs.h>
32
33 extern int main(int argc, char** argv, char** env);
34
35 typedef struct
36 {
37 void (**preinit_array)(void);
38 void (**init_array)(void);
39 void (**fini_array)(void);
40 void (**ctor_list)(void);
41 void (**dtor_list)(void);
42 } structors_array_t;
43
44 __attribute__ ((section (".preinit_array")))
45 void (*__PREINIT_ARRAY__)(void) = (void (*)(void)) -1;
46
47 __attribute__ ((section (".init_array")))
48 void (*__INIT_ARRAY__)(void) = (void (*)(void)) -1;
49
50 __attribute__ ((section (".fini_array")))
51 void (*__FINI_ARRAY__)(void) = (void (*)(void)) -1;
52
53 __attribute__ ((section (".ctors")))
54 void (*__CTOR_LIST__)(void) = (void (*)(void)) -1;
55
56 __attribute__ ((section (".dtors")))
57 void (*__DTOR_LIST__)(void) = (void (*)(void)) -1;
58
do_mips_start(void * raw_args)59 __LIBC_HIDDEN__ void do_mips_start(void *raw_args) {
60 structors_array_t array;
61 array.preinit_array = &__PREINIT_ARRAY__;
62 array.init_array = &__INIT_ARRAY__;
63 array.fini_array = &__FINI_ARRAY__;
64 array.ctor_list = &__CTOR_LIST__;
65 array.dtor_list = &__DTOR_LIST__;
66
67 __libc_init(raw_args, NULL, &main, &array);
68 }
69
70 /*
71 * This function prepares the return address with a branch-and-link
72 * instruction (bal) and then uses a .cpload to compute the Global
73 * Offset Table (GOT) pointer ($gp). The $gp is then used to load
74 * the address of _do_start() into $t9 just before calling it.
75 * Terminating the stack with a NULL return address.
76 */
77 __asm__ (
78 " .set push \n"
79 " \n"
80 " .text \n"
81 " .align 4 \n"
82 " .type __start,@function \n"
83 " .globl __start \n"
84 " .globl _start \n"
85 " \n"
86 " .ent __start \n"
87 "__start: \n"
88 " _start: \n"
89 " .frame $sp,32,$ra \n"
90 " .mask 0x80000000,-4 \n"
91 " \n"
92 " .set noreorder \n"
93 " bal 1f \n"
94 " nop \n"
95 "1: \n"
96 " .cpload $ra \n"
97 " .set reorder \n"
98 " \n"
99 " move $a0, $sp \n"
100 " addiu $sp, $sp, (-32) \n"
101 " sw $0, 28($sp) \n"
102 " la $t9, do_mips_start \n"
103 " jalr $t9 \n"
104 " \n"
105 "2: b 2b \n"
106 " .end __start \n"
107 " \n"
108 " .set pop \n"
109 );
110
111 #include "__dso_handle.h"
112 #include "atexit.h"
113