3 * This file has no copyright assigned and is placed in the Public Domain.
4 * This file is a part of the mingw-runtime package.
5 * No warranty is given; refer to the file DISCLAIMER within the package.
7 * Source code for the startup proceedures used by all programs. This code
8 * is compiled to make crt1.o, which should be located in the library path.
12 /* Hide the declaration of _fmode with dllimport attribute in stdlib.h to
13 avoid problems with older GCC. */
14 #define __IN_MINGW_RUNTIME
21 #define WIN32_LEAN_AND_MEAN
25 /* NOTE: The code for initializing the _argv, _argc, and environ variables
26 * has been moved to a separate .c file which is included in both
27 * crt1.c and dllcrt1.c. This means changes in the code don't have to
28 * be manually synchronized, but it does lead to this not-generally-
29 * a-good-idea use of include. */
31 #include "cpu_features.h"
33 extern void _pei386_runtime_relocator (void);
35 extern int wmain (int, wchar_t **, wchar_t **);
38 * Must have the correct app type for MSVCRT.
42 #define __UNKNOWN_APP 0
43 #define __CONSOLE_APP 1
45 _CRTIMP
void __set_app_type(int);
46 #endif /* __MSVCRT__ */
48 /* Global _fmode for this .exe, not the one in msvcrt.dll,
49 The default is set in txtmode.o in libmingw32.a */
50 /* Override the dllimport'd declarations in stdlib.h */
54 extern int* __p__fmode(void); /* To access the dll _fmode */
58 * Setup the default file handles to have the _CRT_fmode mode, as well as
59 * any new files created by the user.
61 extern int _CRT_fmode
;
64 _mingw32_init_fmode (void)
66 /* Don't set the std file mode if the user hasn't set any value for it. */
72 * This overrides the default file mode settings for stdin,
73 * stdout and stderr. At first I thought you would have to
74 * test with isatty, but it seems that the DOS console at
75 * least is smart enough to handle _O_BINARY stdout and
76 * still display correctly.
80 _setmode (_fileno (stdin
), _CRT_fmode
);
84 _setmode (_fileno (stdout
), _CRT_fmode
);
88 _setmode (_fileno (stderr
), _CRT_fmode
);
92 /* Now sync the dll _fmode to the one for this .exe. */
94 *__p__fmode() = _fmode
;
96 *_imp___fmode_dll
= _fmode
;
100 /* This function will be called when a trap occurs. Thanks to Jacob
101 Navia for his contribution. */
103 _gnu_exception_handler (EXCEPTION_POINTERS
* exception_data
)
105 void (*old_handler
) (int);
106 LONG action
= EXCEPTION_CONTINUE_SEARCH
;
109 switch (exception_data
->ExceptionRecord
->ExceptionCode
)
111 case EXCEPTION_ACCESS_VIOLATION
:
112 /* test if the user has set SIGSEGV */
113 old_handler
= signal (SIGSEGV
, SIG_DFL
);
114 if (old_handler
== SIG_IGN
)
116 /* this is undefined if the signal was raised by anything other
118 signal (SIGSEGV
, SIG_IGN
);
119 action
= EXCEPTION_CONTINUE_EXECUTION
;
121 else if (old_handler
!= SIG_DFL
)
123 /* This means 'old' is a user defined function. Call it */
124 (*old_handler
) (SIGSEGV
);
125 action
= EXCEPTION_CONTINUE_EXECUTION
;
129 case EXCEPTION_ILLEGAL_INSTRUCTION
:
130 case EXCEPTION_PRIV_INSTRUCTION
:
131 /* test if the user has set SIGILL */
132 old_handler
= signal (SIGILL
, SIG_DFL
);
133 if (old_handler
== SIG_IGN
)
135 /* this is undefined if the signal was raised by anything other
137 signal (SIGILL
, SIG_IGN
);
138 action
= EXCEPTION_CONTINUE_EXECUTION
;
140 else if (old_handler
!= SIG_DFL
)
142 /* This means 'old' is a user defined function. Call it */
143 (*old_handler
) (SIGILL
);
144 action
= EXCEPTION_CONTINUE_EXECUTION
;
148 case EXCEPTION_FLT_INVALID_OPERATION
:
149 case EXCEPTION_FLT_DIVIDE_BY_ZERO
:
150 case EXCEPTION_FLT_DENORMAL_OPERAND
:
151 case EXCEPTION_FLT_OVERFLOW
:
152 case EXCEPTION_FLT_UNDERFLOW
:
153 case EXCEPTION_FLT_INEXACT_RESULT
:
157 case EXCEPTION_INT_DIVIDE_BY_ZERO
:
158 /* test if the user has set SIGFPE */
159 old_handler
= signal (SIGFPE
, SIG_DFL
);
160 if (old_handler
== SIG_IGN
)
162 signal (SIGFPE
, SIG_IGN
);
165 action
= EXCEPTION_CONTINUE_EXECUTION
;
167 else if (old_handler
!= SIG_DFL
)
169 /* This means 'old' is a user defined function. Call it */
170 (*old_handler
) (SIGFPE
);
171 action
= EXCEPTION_CONTINUE_EXECUTION
;
182 * The function mainCRTStartup is the entry point for all console programs.
184 static void __declspec(noreturn
)
185 __mingw_wCRTStartup (void)
190 * Set up the top-level exception handler so that signal handling
191 * works as expected. The mapping between ANSI/POSIX signals and
192 * Win32 SE is not 1-to-1, so caveat emptore.
195 SetUnhandledExceptionFilter (_gnu_exception_handler
);
198 * Initialize floating point unit.
200 __cpu_features_init (); /* Do we have SSE, etc.*/
201 _fpreset (); /* Supplied by the runtime library. */
204 * Set up __argc, __argv and _wenviron.
206 _mingw32_init_wmainargs ();
209 * Sets the default file mode.
210 * If _CRT_fmode is set, also set mode for stdin, stdout
211 * and stderr, as well
212 * NOTE: DLLs don't do this because that would be rude!
214 _mingw32_init_fmode ();
216 /* Adust references to dllimported data that have non-zero offsets. */
217 #if defined(__i386__)
218 _pei386_runtime_relocator ();
221 #if defined(__GNUC__)
222 #if defined(__i386__)
223 /* Align the stack to 16 bytes for the sake of SSE ops in main
224 or in functions inlined into main. */
225 asm __volatile__ ("andl $-16, %%esp" : : : "%esp");
226 #elif defined(__mips__)
227 /* Align the stack to 16 bytes */
228 asm __volatile__ ("andi %sp,%sp,-16" : : : "%sp");
229 #elif defined(__PowerPC__)
230 /* Align the stack to 16 bytes */
231 asm __volatile__ ("li 0,15\n\tandc 1,1,0" : : : "r1");
233 #error Unsupported architecture
237 #if defined(_MSC_VER)
239 /* Align the stack to 16 bytes for the sake of SSE ops in main
240 or in functions inlined into main. */
241 __asm
and esp
, 0FFFFFFF0h
243 #error Unsupported architecture
248 * Call the main function. If the user does not supply one
249 * the one in the 'libmingw32.a' library will be linked in, and
250 * that one calls WinMain. See main.c in the 'lib' dir
253 nRet
= wmain (_argc
, _wargv
, _wenviron
);
256 * Perform exit processing for the C library. This means
257 * flushing output and calling 'atexit' registered functions.
265 * The function mainCRTStartup is the entry point for all console programs.
268 wmainCRTStartup (void)
271 __set_app_type (__CONSOLE_APP
);
273 __mingw_wCRTStartup ();
277 * For now the GUI startup function is the same as the console one.
278 * This simply gets rid of the annoying warning about not being able
279 * to find WinMainCRTStartup when linking GUI applications.
282 wWinMainCRTStartup (void)
285 __set_app_type (__GUI_APP
);
287 __mingw_wCRTStartup ();
292 * We force use of library version of atexit, which is only
293 * visible in import lib as _imp__atexit
295 extern int (*_imp__atexit
)(void (*)(void));
296 int atexit (void (* pfn
)(void) )
298 return ( (*_imp__atexit
)(pfn
));
301 /* Likewise for non-ANSI _onexit */
302 extern _onexit_t (*_imp___onexit
)(_onexit_t
);
304 _onexit (_onexit_t pfn
)
306 return (*_imp___onexit
)(pfn
);