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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2016, Richard Lowe.
* Copyright 2020 OmniOS Community Edition (OmniOSce) Association.
*/
/*
* That of the CRT startup routine which itself may be implemented in C.
*/
#include <sys/feature_tests.h>
#include <sys/types.h>
#include <stdlib.h>
#include <synch.h>
#include <unistd.h>
#pragma weak _DYNAMIC
extern uintptr_t _DYNAMIC;
#pragma weak environ = _environ
char **_environ = NULL;
char **___Argv = NULL;
extern int main(int argc, char **argv, char **envp);
extern void _init(void);
extern void _fini(void);
#pragma weak __start_crt_compiler
extern int __start_crt_compiler(int argc, char **argv);
#if defined(__x86)
int __longdouble_used = 0;
extern void __fpstart(void);
#endif
#if defined(__i386) /* Not amd64 */
#pragma weak __fsr_init_value
extern long __fsr_init_value;
extern void __fsr(uintptr_t);
#endif
/*
* Defined here for ABI reasons, must match the definition in libc.
* If it cannot, a new symbol must be created.
*/
mutex_t __environ_lock = DEFAULTMUTEX;
void
_start_crt(int argc, char **argv, void (*exit_handler)(void))
{
int ret = 0;
/*
* On x86, we check whether we're a dynamic executable to see whether
* we'll receive an exit_handler.
*
* On SPARC, we just need to check whether the handler was NULL.
*/
#if defined(__x86)
if (&_DYNAMIC != NULL)
(void) atexit(exit_handler);
#elif defined(__sparc)
if (exit_handler != NULL)
(void) atexit(exit_handler);
#endif
(void) atexit(_fini);
_environ = argv + (argc + 1);
___Argv = argv;
/*
* __start_crt_compiler() provides a hook for compilers to perform
* extra initialisation before main() is called. For example, gcc uses
* this to initialise profiling code for objects built with its -pg
* option by linking in an extra object that provides this function.
*
* This mechanism replaces the earlier separate gcrt1.o.
*
* If __start_crt_compiler() returns a non-zero value, then the
* process will exit with that value, without main() being called.
*/
if (&__start_crt_compiler != NULL)
ret = __start_crt_compiler(argc, argv);
if (ret == 0) {
#if defined(__x86)
__fpstart();
#endif
#if defined(__i386) /* Not amd64 */
/*
* Note that Studio cc(1) sets the _value of the symbol_, that
* is, its address. Not the value _at_ that address.
*/
__fsr((uintptr_t)&__fsr_init_value);
#endif
_init();
ret = main(argc, argv, _environ);
}
exit(ret);
_exit(ret);
}
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