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
20 #define WIN32_LEAN_AND_MEAN
24 /* NOTE: The code for initializing the _argv, _argc, and environ variables
25 * has been moved to a separate .c file which is included in both
26 * crt1.c and dllcrt1.c. This means changes in the code don't have to
27 * be manually synchronized, but it does lead to this not-generally-
28 * a-good-idea use of include. */
30 #include "cpu_features.h"
32 extern void _pei386_runtime_relocator (void);
34 extern int main (int, char **, char **);
37 * Must have the correct app type for MSVCRT.
41 #define __UNKNOWN_APP 0
42 #define __CONSOLE_APP 1
44 __MINGW_IMPORT
void __set_app_type(int);
45 #endif /* __MSVCRT__ */
47 /* Global _fmode for this .exe, not the one in msvcrt.dll,
48 The default is set in txtmode.o in libmingw32.a */
49 /* Override the dllimport'd declarations in stdlib.h */
53 extern int* __p__fmode(void); /* To access the dll _fmode */
57 * Setup the default file handles to have the _CRT_fmode mode, as well as
58 * any new files created by the user.
60 extern int _CRT_fmode
;
63 _mingw32_init_fmode (void)
65 /* Don't set the std file mode if the user hasn't set any value for it. */
71 * This overrides the default file mode settings for stdin,
72 * stdout and stderr. At first I thought you would have to
73 * test with isatty, but it seems that the DOS console at
74 * least is smart enough to handle _O_BINARY stdout and
75 * still display correctly.
79 _setmode (_fileno (stdin
), _CRT_fmode
);
83 _setmode (_fileno (stdout
), _CRT_fmode
);
87 _setmode (_fileno (stderr
), _CRT_fmode
);
91 /* Now sync the dll _fmode to the one for this .exe. */
93 *__p__fmode() = _fmode
;
95 *_imp___fmode_dll
= _fmode
;
99 /* This function will be called when a trap occurs. Thanks to Jacob
100 Navia for his contribution. */
102 _gnu_exception_handler (EXCEPTION_POINTERS
* exception_data
)
104 void (*old_handler
) (int);
105 LONG action
= EXCEPTION_CONTINUE_SEARCH
;
108 switch (exception_data
->ExceptionRecord
->ExceptionCode
)
110 case EXCEPTION_ACCESS_VIOLATION
:
111 /* test if the user has set SIGSEGV */
112 old_handler
= signal (SIGSEGV
, SIG_DFL
);
113 if (old_handler
== SIG_IGN
)
115 /* this is undefined if the signal was raised by anything other
117 signal (SIGSEGV
, SIG_IGN
);
118 action
= EXCEPTION_CONTINUE_EXECUTION
;
120 else if (old_handler
!= SIG_DFL
)
122 /* This means 'old' is a user defined function. Call it */
123 (*old_handler
) (SIGSEGV
);
124 action
= EXCEPTION_CONTINUE_EXECUTION
;
128 case EXCEPTION_ILLEGAL_INSTRUCTION
:
129 case EXCEPTION_PRIV_INSTRUCTION
:
130 /* test if the user has set SIGILL */
131 old_handler
= signal (SIGILL
, SIG_DFL
);
132 if (old_handler
== SIG_IGN
)
134 /* this is undefined if the signal was raised by anything other
136 signal (SIGILL
, SIG_IGN
);
137 action
= EXCEPTION_CONTINUE_EXECUTION
;
139 else if (old_handler
!= SIG_DFL
)
141 /* This means 'old' is a user defined function. Call it */
142 (*old_handler
) (SIGILL
);
143 action
= EXCEPTION_CONTINUE_EXECUTION
;
147 case EXCEPTION_FLT_INVALID_OPERATION
:
148 case EXCEPTION_FLT_DIVIDE_BY_ZERO
:
149 case EXCEPTION_FLT_DENORMAL_OPERAND
:
150 case EXCEPTION_FLT_OVERFLOW
:
151 case EXCEPTION_FLT_UNDERFLOW
:
152 case EXCEPTION_FLT_INEXACT_RESULT
:
156 case EXCEPTION_INT_DIVIDE_BY_ZERO
:
157 /* test if the user has set SIGFPE */
158 old_handler
= signal (SIGFPE
, SIG_DFL
);
159 if (old_handler
== SIG_IGN
)
161 signal (SIGFPE
, SIG_IGN
);
164 action
= EXCEPTION_CONTINUE_EXECUTION
;
166 else if (old_handler
!= SIG_DFL
)
168 /* This means 'old' is a user defined function. Call it */
169 (*old_handler
) (SIGFPE
);
170 action
= EXCEPTION_CONTINUE_EXECUTION
;
181 * The function mainCRTStartup is the entry point for all console programs.
183 static void __attribute__((noreturn
))
184 __mingw_CRTStartup (void)
189 * Set up the top-level exception handler so that signal handling
190 * works as expected. The mapping between ANSI/POSIX signals and
191 * Win32 SE is not 1-to-1, so caveat emptore.
194 SetUnhandledExceptionFilter (_gnu_exception_handler
);
197 * Initialize floating point unit.
199 __cpu_features_init (); /* Do we have SSE, etc.*/
200 _fpreset (); /* Supplied by the runtime library. */
203 * Set up __argc, __argv and _environ.
205 _mingw32_init_mainargs ();
208 * Sets the default file mode.
209 * If _CRT_fmode is set, also set mode for stdin, stdout
210 * and stderr, as well
211 * NOTE: DLLs don't do this because that would be rude!
213 _mingw32_init_fmode ();
215 /* Adust references to dllimported data that have non-zero offsets. */
216 _pei386_runtime_relocator ();
218 #if defined(__i386__)
219 /* Align the stack to 16 bytes for the sake of SSE ops in main
220 or in functions inlined into main. */
221 asm __volatile__ ("andl $-16, %%esp" : : : "%esp");
222 #elif defined(__mips__)
223 /* Align the stack to 16 bytes */
224 asm __volatile__ ("andi %sp,%sp,-16" : : : "%sp");
225 #elif defined(__PowerPC__)
226 /* Align the stack to 16 bytes */
227 asm __volatile__ ("li 0,15\n\tandc 1,1,0" : : : "r1");
229 #error Unsupported architecture
233 * Call the main function. If the user does not supply one
234 * the one in the 'libmingw32.a' library will be linked in, and
235 * that one calls WinMain. See main.c in the 'lib' dir
238 nRet
= main (_argc
, _argv
, _environ
);
241 * Perform exit processing for the C library. This means
242 * flushing output and calling 'atexit' registered functions.
250 * The function mainCRTStartup is the entry point for all console programs.
253 mainCRTStartup (void)
256 __set_app_type (__CONSOLE_APP
);
258 __mingw_CRTStartup ();
262 * For now the GUI startup function is the same as the console one.
263 * This simply gets rid of the annoying warning about not being able
264 * to find WinMainCRTStartup when linking GUI applications.
267 WinMainCRTStartup (void)
270 __set_app_type (__GUI_APP
);
272 __mingw_CRTStartup ();
277 * We force use of library version of atexit, which is only
278 * visible in import lib as _imp__atexit
280 extern int (*_imp__atexit
)(void (*)(void));
281 int atexit (void (* pfn
)(void) )
283 return ( (*_imp__atexit
)(pfn
));
286 /* Likewise for non-ANSI _onexit */
287 extern _onexit_t (*_imp___onexit
)(_onexit_t
);
289 _onexit (_onexit_t pfn
)
291 return (*_imp___onexit
)(pfn
);