1 /* SPDX-License-Identifier: LGPL-2.1 OR MIT */
3 * C Run Time support for NOLIBC
4 * Copyright (C) 2023 Zhangjin Wu <falcon@tinylab.org>
10 char **environ __attribute__((weak));
11 const unsigned long *_auxv __attribute__((weak));
13 static void __stack_chk_init(void);
14 static void exit(int);
16 extern void (*const __preinit_array_start[])(void) __attribute__((weak));
17 extern void (*const __preinit_array_end[])(void) __attribute__((weak));
19 extern void (*const __init_array_start[])(void) __attribute__((weak));
20 extern void (*const __init_array_end[])(void) __attribute__((weak));
22 extern void (*const __fini_array_start[])(void) __attribute__((weak));
23 extern void (*const __fini_array_end[])(void) __attribute__((weak));
26 void _start_c(long *sp)
32 void (* const *func)(void);
33 const unsigned long *auxv;
34 /* silence potential warning: conflicting types for 'main' */
35 int _nolibc_main(int, char **, char **) __asm__ ("main");
37 /* initialize stack protector */
41 * sp : argc <-- argument count, required by main()
42 * argv: argv[0] <-- argument vector, required by main()
47 * environ: environ[0] <-- environment variables, required by main() and getenv()
51 * _auxv: _auxv[0] <-- auxiliary vector, required by getauxval()
57 /* assign argc and argv */
59 argv = (void *)(sp + 1);
62 environ = envp = argv + argc + 1;
65 for (auxv = (void *)envp; *auxv++;)
69 for (func = __preinit_array_start; func < __preinit_array_end; func++)
71 for (func = __init_array_start; func < __init_array_end; func++)
74 /* go to application */
75 exitcode = _nolibc_main(argc, argv, envp);
77 for (func = __fini_array_end; func > __fini_array_start;)
83 #endif /* _NOLIBC_CRT_H */