1 | /* Startup code for elf32-sparc |
2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
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 |
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. |
9 | |
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 | |
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 |
30 | Lesser General Public License for more details. |
31 | |
32 | You should have received a copy of the GNU Lesser General Public |
33 | License along with the GNU C Library; if not, see |
34 | <https://www.gnu.org/licenses/>. */ |
35 | |
36 | #include <sysdep.h> |
37 | |
38 | |
39 | .section ".text" |
40 | .align 4 |
41 | .global _start |
42 | .type _start,#function |
43 | _start: |
44 | #ifdef PIC |
45 | SETUP_PIC_REG(l7) |
46 | #endif |
47 | |
48 | /* Terminate the stack frame, and reserve space for functions to |
49 | drop their arguments. */ |
50 | mov %g0, %fp |
51 | sub %sp, 6*4, %sp |
52 | |
53 | /* Extract the arguments and environment as encoded on the stack. The |
54 | argument info starts after one register window (16 words) past the SP. */ |
55 | ld [%sp+22*4], %o1 |
56 | add %sp, 23*4, %o2 |
57 | |
58 | /* Load the addresses of the user entry points. */ |
59 | #ifndef PIC |
60 | sethi %hi(main), %o0 |
61 | or %o0, %lo(main), %o0 |
62 | #else |
63 | sethi %gdop_hix22(main), %o0 |
64 | xor %o0, %gdop_lox10(main), %o0 |
65 | ld [%l7 + %o0], %o0, %gdop(main) |
66 | #endif |
67 | mov 0, %o3 /* Used to be init. */ |
68 | mov 0, %o4 /* Used to be fini. */ |
69 | |
70 | /* When starting a binary via the dynamic linker, %g1 contains the |
71 | address of the shared library termination function, which will be |
72 | registered with atexit(). If we are statically linked, this will |
73 | be NULL. */ |
74 | mov %g1, %o5 |
75 | |
76 | /* Let libc do the rest of the initialization, and call main. */ |
77 | call __libc_start_main |
78 | nop |
79 | |
80 | /* Die very horribly if exit returns. */ |
81 | unimp |
82 | |
83 | .size _start, .-_start |
84 | |
85 | /* Define a symbol for the first piece of initialized data. */ |
86 | .data |
87 | .globl __data_start |
88 | __data_start: |
89 | .long 0 |
90 | weak_alias (__data_start, data_start) |
91 | |