kolibrios/programs/develop/libraries/newlib/crt/crt1.c

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/*
* crt1.c
* This file has no copyright assigned and is placed in the Public Domain.
* This file is a part of the mingw-runtime package.
* No warranty is given; refer to the file DISCLAIMER within the package.
*
* Source code for the startup proceedures used by all programs. This code
* is compiled to make crt1.o, which should be located in the library path.
*
*/
/* Hide the declaration of _fmode with dllimport attribute in stdlib.h to
avoid problems with older GCC. */
#include <newlib.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/kos_io.h>
#include "cpu_features.h"
/* NOTE: The code for initializing the _argv, _argc, and environ variables
* has been moved to a separate .c file which is included in both
* crt1.c and dllcrt1.c. This means changes in the code don't have to
* be manually synchronized, but it does lead to this not-generally-
* a-good-idea use of include. */
extern char __cmdline;
extern char __pgmname;
extern int main (int, char **, char **);
int _errno;
int _fmode;
char __appcwd[1024];
int __appcwdlen;
int _argc;
char **_argv;
static char *arg[2];
void _exit(int __status) __attribute__((noreturn));
char * __libc_getenv(const char *name)
{
return NULL;
}
void __main (){};
void init_reent();
void __attribute__((noreturn))
__thread_startup (int (*entry)(void*), void *param,
void *stacklow, void *stackhigh)
{
int retval;
__asm__ __volatile__( // save stack limits
"movl %0, %%fs:4 \n\t" // use TLS
"movl %1, %%fs:8 \n\t"
::"r"(stacklow), "r"(stackhigh));
init_reent(); // initialize thread reentry structure
retval = entry(param); // call user thread function
_exit(retval);
};
struct app_hdr
{
char banner[8];
int version;
int start;
int iend;
int memsize;
int stacktop;
char *cmdline;
char *path;
};
void __attribute__((noreturn))
__crt_startup (void)
{
int nRet;
struct app_hdr *header;
init_global_reent();
/*
* Initialize floating point unit.
*/
__cpu_features_init (); /* Do we have SSE, etc.*/
// _fpreset (); /* Supplied by the runtime library. */
__initPOSIXHandles();
__appcwdlen = strrchr(&__pgmname, '/') - &__pgmname + 1;
__appcwdlen = __appcwdlen > 1023 ? 1023 : __appcwdlen;
memcpy(__appcwd, &__pgmname, __appcwdlen);
__appcwd[__appcwdlen] = 0;
set_cwd(__appcwd);
arg[0] = &__pgmname;
if( __cmdline != 0)
{
_argc = 2;
arg[1] = &__cmdline;
} else _argc = 1;
_argv = arg;
/*
* Sets the default file mode.
* If _CRT_fmode is set, also set mode for stdin, stdout
* and stderr, as well
* NOTE: DLLs don't do this because that would be rude!
*/
// _mingw32_init_fmode ();
nRet = main (_argc, _argv, NULL);
/*
* Perform exit processing for the C library. This means
* flushing output and calling 'atexit' registered functions.
*/
exit (nRet);
}