]>
Commit | Line | Data |
---|---|---|
3846ef75 | 1 | /* Startup code for SH & ELF. |
d4697bc9 | 2 | Copyright (C) 1999-2014 Free Software Foundation, Inc. |
3846ef75 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. | |
3846ef75 | 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 | ||
3846ef75 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. |
3846ef75 | 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/>. */ | |
3846ef75 UD |
35 | |
36 | /* This is the canonical entry point, usually the first thing in the text | |
37 | segment. | |
38 | ||
39 | Note that the code in the .init section has already been run. | |
40 | This includes _init and _libc_init | |
41 | ||
42 | ||
43 | At this entry point, most registers' values are unspecified, except: | |
44 | ||
45 | r4 Contains a function pointer to be registered with `atexit'. | |
6a7a8b22 | 46 | This is how the dynamic linker arranges to have DT_FINI |
3846ef75 UD |
47 | functions called for shared libraries that have been loaded |
48 | before this code runs. | |
49 | ||
50 | sp The stack contains the arguments and environment: | |
6a7a8b22 | 51 | 0(sp) argc |
3846ef75 UD |
52 | 4(sp) argv[0] |
53 | ... | |
54 | (4*argc)(sp) NULL | |
55 | (4*(argc+1))(sp) envp[0] | |
56 | ... | |
57 | NULL | |
58 | */ | |
59 | ||
60 | .text | |
61 | .globl _start | |
d1cf3e71 | 62 | .type _start,@function |
3846ef75 UD |
63 | _start: |
64 | /* Clear the frame pointer since this is the outermost frame. */ | |
65 | mov #0, r14 | |
66 | ||
67 | /* Pop argc off the stack and save a pointer to argv */ | |
68 | mov.l @r15+,r5 | |
69 | mov r15, r6 | |
70 | ||
71 | /* Push the last arguments to main() onto the stack */ | |
72 | mov.l r4,@-r15 | |
73 | mov.l L_fini,r0 | |
74 | mov.l r0,@-r15 | |
75 | ||
76 | /* Set up the other arguments for main() that go in registers */ | |
77 | mov.l L_main,r4 | |
78 | mov.l L_init,r7 | |
79 | ||
80 | /* __libc_start_main (main, argc, argv, init, fini, rtld_fini) */ | |
81 | ||
82 | /* Let the libc call main and exit with its return code. */ | |
83 | mov.l L_libc_start_main,r1 | |
84 | jsr @r1 | |
85 | nop | |
86 | /* should never get here....*/ | |
87 | mov.l L_abort,r1 | |
88 | jsr @r1 | |
89 | nop | |
90 | .align 2 | |
91 | L_main: | |
92 | .long main | |
93 | L_init: | |
06b31ad3 | 94 | .long __libc_csu_init |
3846ef75 | 95 | L_fini: |
06b31ad3 | 96 | .long __libc_csu_fini |
3846ef75 UD |
97 | L_libc_start_main: |
98 | .long __libc_start_main | |
99 | L_abort: | |
100 | .long abort | |
101 | /* Define a symbol for the first piece of initialized data. */ | |
102 | .data | |
103 | .globl __data_start | |
104 | __data_start: | |
105 | .long 0 | |
106 | .weak data_start | |
107 | data_start = __data_start | |
aa298c08 UD |
108 | .global __fpscr_values |
109 | __fpscr_values: | |
110 | .long 0 | |
111 | .long 0x80000 |