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66000494 | 1 | /* Startup code for programs linked with GNU libc. |
b168057a | 2 | Copyright (C) 1998-2015 Free Software Foundation, Inc. |
66000494 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
6075607b | 9 | |
92c6ccd1 RM |
10 | In addition to the permissions in the GNU Lesser General Public |
11 | License, the Free Software Foundation gives you unlimited | |
12 | permission to link the compiled version of this file with other | |
13 | programs, and to distribute those programs without any restriction | |
14 | coming from the use of this file. (The GNU Lesser General Public | |
15 | License restrictions do apply in other respects; for example, they | |
16 | cover modification of the file, and distribution when not linked | |
17 | into another program.) | |
18 | ||
19 | Note that people who make modified versions of this file are not | |
20 | obligated to grant this special exception for their modified | |
21 | versions; it is their choice whether to do so. The GNU Lesser | |
22 | General Public License gives permission to release a modified | |
23 | version without this exception; this exception also makes it | |
24 | possible to release a modified version which carries forward this | |
25 | exception. | |
26 | ||
66000494 UD |
27 | The GNU C Library is distributed in the hope that it will be useful, |
28 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 30 | Lesser General Public License for more details. |
66000494 | 31 | |
41bdb6e2 | 32 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
33 | License along with the GNU C Library; if not, see |
34 | <http://www.gnu.org/licenses/>. */ | |
66000494 UD |
35 | |
36 | #include <sysdep.h> | |
37 | ||
b0f1246a AM |
38 | /* We do not want .eh_frame info for crt1.o since crt1.o is linked |
39 | before crtbegin.o, the file defining __EH_FRAME_BEGIN__. */ | |
40 | #undef cfi_startproc | |
41 | #define cfi_startproc | |
42 | #undef cfi_endproc | |
43 | #define cfi_endproc | |
44 | ||
66000494 | 45 | /* These are the various addresses we require. */ |
e7c5ac68 UD |
46 | #ifdef PIC |
47 | .section ".data" | |
48 | #else | |
66000494 | 49 | .section ".rodata" |
e7c5ac68 | 50 | #endif |
66000494 UD |
51 | .align 2 |
52 | L(start_addresses): | |
53 | .long _SDA_BASE_ | |
b5510883 | 54 | .long main |
e7c5ac68 UD |
55 | .long __libc_csu_init |
56 | .long __libc_csu_fini | |
66000494 UD |
57 | ASM_SIZE_DIRECTIVE(L(start_addresses)) |
58 | ||
59 | .section ".text" | |
60 | ENTRY(_start) | |
61 | /* Save the stack pointer, in case we're statically linked under Linux. */ | |
217eb19b | 62 | mr r9,r1 |
66000494 | 63 | /* Set up an initial stack frame, and clear the LR. */ |
217eb19b | 64 | clrrwi r1,r1,4 |
e7c5ac68 | 65 | #ifdef PIC |
91d2a845 | 66 | SETUP_GOT_ACCESS(r13,got_label) |
e7c5ac68 | 67 | li r0,0 |
e7c5ac68 | 68 | #else |
217eb19b | 69 | li r0,0 |
e7c5ac68 | 70 | #endif |
217eb19b UD |
71 | stwu r1,-16(r1) |
72 | mtlr r0 | |
73 | stw r0,0(r1) | |
66000494 | 74 | /* Set r13 to point at the 'small data area', and put the address of |
99c7f870 UD |
75 | start_addresses in r8. Also load the GOT pointer so that new PLT |
76 | calls work, like the one to __libc_start_main. */ | |
e7c5ac68 | 77 | #ifdef PIC |
91d2a845 WS |
78 | addis r30,r13,_GLOBAL_OFFSET_TABLE_-got_label@ha |
79 | addis r8,r13,L(start_addresses)-got_label@ha | |
80 | addi r30,r30,_GLOBAL_OFFSET_TABLE_-got_label@l | |
b813d73f | 81 | lwzu r13, L(start_addresses)-got_label@l(r8) |
e7c5ac68 | 82 | #else |
217eb19b UD |
83 | lis r8,L(start_addresses)@ha |
84 | lwzu r13,L(start_addresses)@l(r8) | |
e7c5ac68 | 85 | #endif |
66000494 | 86 | /* and continue in libc-start, in glibc. */ |
b5510883 | 87 | b JUMPTARGET(__libc_start_main) |
66000494 UD |
88 | END(_start) |
89 | ||
90 | /* Define a symbol for the first piece of initialized data. */ | |
91 | .section ".data" | |
fb0dd050 | 92 | .globl __data_start |
66000494 | 93 | __data_start: |
e42e88ab | 94 | .long 0 |
66000494 | 95 | weak_alias (__data_start, data_start) |