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754283ce83
Since 2005 glibc has passed argc, argv, and envp to all constructors. As it is cheap and easy to do so, mirror that behaviour in nolibc. This makes it easier to migrate applications to nolibc. Link: https://lore.kernel.org/r/20240728-nolibc-constructor-args-v1-1-36d0bf5cd4c0@weissschuh.net Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* C Run Time support for NOLIBC
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* Copyright (C) 2023 Zhangjin Wu <falcon@tinylab.org>
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*/
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#ifndef _NOLIBC_CRT_H
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#define _NOLIBC_CRT_H
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char **environ __attribute__((weak));
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const unsigned long *_auxv __attribute__((weak));
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static void __stack_chk_init(void);
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static void exit(int);
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extern void (*const __preinit_array_start[])(int, char **, char**) __attribute__((weak));
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extern void (*const __preinit_array_end[])(int, char **, char**) __attribute__((weak));
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extern void (*const __init_array_start[])(int, char **, char**) __attribute__((weak));
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extern void (*const __init_array_end[])(int, char **, char**) __attribute__((weak));
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extern void (*const __fini_array_start[])(void) __attribute__((weak));
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extern void (*const __fini_array_end[])(void) __attribute__((weak));
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__attribute__((weak))
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void _start_c(long *sp)
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{
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long argc;
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char **argv;
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char **envp;
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int exitcode;
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void (* const *ctor_func)(int, char **, char **);
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void (* const *dtor_func)(void);
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const unsigned long *auxv;
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/* silence potential warning: conflicting types for 'main' */
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int _nolibc_main(int, char **, char **) __asm__ ("main");
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/* initialize stack protector */
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__stack_chk_init();
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/*
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* sp : argc <-- argument count, required by main()
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* argv: argv[0] <-- argument vector, required by main()
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* argv[1]
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* ...
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* argv[argc-1]
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* null
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* environ: environ[0] <-- environment variables, required by main() and getenv()
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* environ[1]
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* ...
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* null
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* _auxv: _auxv[0] <-- auxiliary vector, required by getauxval()
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* _auxv[1]
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* ...
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* null
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*/
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/* assign argc and argv */
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argc = *sp;
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argv = (void *)(sp + 1);
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/* find environ */
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environ = envp = argv + argc + 1;
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/* find _auxv */
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for (auxv = (void *)envp; *auxv++;)
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;
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_auxv = auxv;
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for (ctor_func = __preinit_array_start; ctor_func < __preinit_array_end; ctor_func++)
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(*ctor_func)(argc, argv, envp);
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for (ctor_func = __init_array_start; ctor_func < __init_array_end; ctor_func++)
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(*ctor_func)(argc, argv, envp);
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/* go to application */
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exitcode = _nolibc_main(argc, argv, envp);
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for (dtor_func = __fini_array_end; dtor_func > __fini_array_start;)
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(*--dtor_func)();
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exit(exitcode);
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}
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#endif /* _NOLIBC_CRT_H */
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