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c776fa11 | 1 | /* Startup code compliant to the ELF RISC-V ABI. |
04277e02 | 2 | Copyright (C) 1995-2019 Free Software Foundation, Inc. |
c776fa11 PD |
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 | |
5a82c748 | 34 | <https://www.gnu.org/licenses/>. */ |
c776fa11 PD |
35 | |
36 | #define __ASSEMBLY__ 1 | |
37 | #include <entry.h> | |
38 | #include <sysdep.h> | |
39 | #include <sys/asm.h> | |
40 | ||
41 | /* The entry point's job is to call __libc_start_main. Per the ABI, | |
42 | a0 contains the address of a function to be passed to atexit. | |
43 | __libc_start_main wants this in a5. */ | |
44 | ||
45 | ENTRY (ENTRY_POINT) | |
2dd12baa AS |
46 | /* Terminate call stack by noting ra is undefined. Use a dummy |
47 | .cfi_label to force starting the FDE. */ | |
48 | .cfi_label .Ldummy | |
49 | cfi_undefined (ra) | |
c776fa11 PD |
50 | call .Lload_gp |
51 | mv a5, a0 /* rtld_fini. */ | |
52 | /* main may be in a shared library. */ | |
53 | la a0, main | |
54 | REG_L a1, 0(sp) /* argc. */ | |
55 | addi a2, sp, SZREG /* argv. */ | |
56 | andi sp, sp, ALMASK /* Align stack. */ | |
57 | lla a3, __libc_csu_init | |
58 | lla a4, __libc_csu_fini | |
59 | mv a6, sp /* stack_end. */ | |
60 | ||
2dd12baa AS |
61 | call __libc_start_main@plt |
62 | ebreak | |
c776fa11 PD |
63 | END (ENTRY_POINT) |
64 | ||
65 | /* Dynamic links need the global pointer to be initialized prior to calling | |
66 | any shared library's initializers, so we use preinit_array to load it. | |
67 | This doesn't cut it for static links, though, since the global pointer | |
68 | needs to be initialized before calling __libc_start_main in that case. | |
69 | So we redundantly initialize it at the beginning of _start. */ | |
70 | ||
71 | .Lload_gp: | |
72 | .option push | |
73 | .option norelax | |
74 | lla gp, __global_pointer$ | |
75 | .option pop | |
76 | ret | |
77 | ||
78 | .section .preinit_array,"aw" | |
79 | .dc.a .Lload_gp | |
80 | ||
81 | /* Define a symbol for the first piece of initialized data. */ | |
82 | .data | |
83 | .globl __data_start | |
84 | __data_start: | |
85 | .weak data_start | |
86 | data_start = __data_start |