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| 1 | /* SPDX-License-Identifier: LGPL-2.1 OR MIT */ |
|---|---|
| 2 | /* |
| 3 | * C Run Time support for NOLIBC |
| 4 | * Copyright (C) 2023 Zhangjin Wu <falcon@tinylab.org> |
| 5 | */ |
| 6 | |
| 7 | #ifndef _NOLIBC_CRT_H |
| 8 | #define _NOLIBC_CRT_H |
| 9 | |
| 10 | char **environ __attribute__((weak)); |
| 11 | const unsigned long *_auxv __attribute__((weak)); |
| 12 | |
| 13 | static void __stack_chk_init(void); |
| 14 | static void exit(int); |
| 15 | |
| 16 | extern void (*const __preinit_array_start[])(void) __attribute__((weak)); |
| 17 | extern void (*const __preinit_array_end[])(void) __attribute__((weak)); |
| 18 | |
| 19 | extern void (*const __init_array_start[])(void) __attribute__((weak)); |
| 20 | extern void (*const __init_array_end[])(void) __attribute__((weak)); |
| 21 | |
| 22 | extern void (*const __fini_array_start[])(void) __attribute__((weak)); |
| 23 | extern void (*const __fini_array_end[])(void) __attribute__((weak)); |
| 24 | |
| 25 | __attribute__((weak)) |
| 26 | void _start_c(long *sp) |
| 27 | { |
| 28 | long argc; |
| 29 | char **argv; |
| 30 | char **envp; |
| 31 | int exitcode; |
| 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"); |
| 36 | |
| 37 | /* initialize stack protector */ |
| 38 | __stack_chk_init(); |
| 39 | |
| 40 | /* |
| 41 | * sp : argc <-- argument count, required by main() |
| 42 | * argv: argv[0] <-- argument vector, required by main() |
| 43 | * argv[1] |
| 44 | * ... |
| 45 | * argv[argc-1] |
| 46 | * null |
| 47 | * environ: environ[0] <-- environment variables, required by main() and getenv() |
| 48 | * environ[1] |
| 49 | * ... |
| 50 | * null |
| 51 | * _auxv: _auxv[0] <-- auxiliary vector, required by getauxval() |
| 52 | * _auxv[1] |
| 53 | * ... |
| 54 | * null |
| 55 | */ |
| 56 | |
| 57 | /* assign argc and argv */ |
| 58 | argc = *sp; |
| 59 | argv = (void *)(sp + 1); |
| 60 | |
| 61 | /* find environ */ |
| 62 | environ = envp = argv + argc + 1; |
| 63 | |
| 64 | /* find _auxv */ |
| 65 | for (auxv = (void *)envp; *auxv++;) |
| 66 | ; |
| 67 | _auxv = auxv; |
| 68 | |
| 69 | for (func = __preinit_array_start; func < __preinit_array_end; func++) |
| 70 | (*func)(); |
| 71 | for (func = __init_array_start; func < __init_array_end; func++) |
| 72 | (*func)(); |
| 73 | |
| 74 | /* go to application */ |
| 75 | exitcode = _nolibc_main(argc, argv, envp); |
| 76 | |
| 77 | for (func = __fini_array_end; func > __fini_array_start;) |
| 78 | (*--func)(); |
| 79 | |
| 80 | exit(exitcode); |
| 81 | } |
| 82 | |
| 83 | #endif /* _NOLIBC_CRT_H */ |
| 84 |
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