mirror of
https://github.com/nxp-imx/linux-imx.git
synced 2025-09-03 02:16:09 +02:00
921992229b
Otherwise the different instances of _start_c from each compilation unit
will lead to linker errors:
/usr/bin/ld: /tmp/ccSNvRqs.o: in function `_start_c':
nolibc-test-foo.c:(.text.nolibc_memset+0x9): multiple definition of `_start_c'; /tmp/ccG25101.o:nolibc-test.c:(.text+0x1ea3): first defined here
Fixes: 1733675515 ("tools/nolibc: add new crt.h with _start_c")
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/lkml/20231012-nolibc-start_c-multiple-v1-1-fbfc73e0283f@weissschuh.net/
Link: https://lore.kernel.org/lkml/20231012-nolibc-linkage-test-v1-1-315e682768b4@weissschuh.net/
Acked-by: Willy Tarreau <w@1wt.eu>
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
|
|
/*
|
|
* C Run Time support for NOLIBC
|
|
* Copyright (C) 2023 Zhangjin Wu <falcon@tinylab.org>
|
|
*/
|
|
|
|
#ifndef _NOLIBC_CRT_H
|
|
#define _NOLIBC_CRT_H
|
|
|
|
char **environ __attribute__((weak));
|
|
const unsigned long *_auxv __attribute__((weak));
|
|
|
|
static void __stack_chk_init(void);
|
|
static void exit(int);
|
|
|
|
__attribute__((weak))
|
|
void _start_c(long *sp)
|
|
{
|
|
long argc;
|
|
char **argv;
|
|
char **envp;
|
|
const unsigned long *auxv;
|
|
/* silence potential warning: conflicting types for 'main' */
|
|
int _nolibc_main(int, char **, char **) __asm__ ("main");
|
|
|
|
/* initialize stack protector */
|
|
__stack_chk_init();
|
|
|
|
/*
|
|
* sp : argc <-- argument count, required by main()
|
|
* argv: argv[0] <-- argument vector, required by main()
|
|
* argv[1]
|
|
* ...
|
|
* argv[argc-1]
|
|
* null
|
|
* environ: environ[0] <-- environment variables, required by main() and getenv()
|
|
* environ[1]
|
|
* ...
|
|
* null
|
|
* _auxv: _auxv[0] <-- auxiliary vector, required by getauxval()
|
|
* _auxv[1]
|
|
* ...
|
|
* null
|
|
*/
|
|
|
|
/* assign argc and argv */
|
|
argc = *sp;
|
|
argv = (void *)(sp + 1);
|
|
|
|
/* find environ */
|
|
environ = envp = argv + argc + 1;
|
|
|
|
/* find _auxv */
|
|
for (auxv = (void *)envp; *auxv++;)
|
|
;
|
|
_auxv = auxv;
|
|
|
|
/* go to application */
|
|
exit(_nolibc_main(argc, argv, envp));
|
|
}
|
|
|
|
#endif /* _NOLIBC_CRT_H */
|