1 // bootstrap.cxx -- bootstrap routines: main()
3 // Written by Curtis Olson, started May 1997.
5 // Copyright (C) 1997 - 2002 Curtis L. Olson - curt@flightgear.org
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #if defined(__linux__) && defined(__i386__)
29 # include <fpu_control.h>
35 #include <simgear/compiler.h>
36 #include <simgear/structure/exception.hxx>
37 #include <simgear/debug/logstream.hxx>
54 # include <console.h> // -dw- for command line dialog
58 #if defined(__linux__) && defined(__i386__)
60 static void handleFPE (int);
65 fpu_control_t fpe_flags = 0;
66 _FPU_GETCW(fpe_flags);
67 // fpe_flags &= ~_FPU_MASK_IM; // invalid operation
68 // fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
69 // fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
70 // fpe_flags &= ~_FPU_MASK_OM; // overflow
71 // fpe_flags &= ~_FPU_MASK_UM; // underflow
72 // fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
73 _FPU_SETCW(fpe_flags);
74 signal(SIGFPE, handleFPE);
81 SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
94 short CPSGetCurrentProcess(PSN *psn);
95 short CPSSetProcessName (PSN *psn, char *processname);
96 short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
97 short CPSSetFrontProcess(PSN *psn);
100 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
105 int main ( int argc, char **argv );
106 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
107 LPSTR lpCmdLine, int nCmdShow) {
109 main( __argc, __argv );
117 set the special "flush zero" bit (FS, bit 24) in the Control Status
118 Register of the FPU of R4k and beyond so that the result of any
119 underflowing operation will be clamped to zero, and no exception of
120 any kind will be generated on the CPU. This has no effect on an
123 the FS bit is inherited by processes fork()ed out of this one,
124 but it is not inherited across an exec(). so anytime you exec()
125 a process, you must re-set the FS bit in that process.
130 f.fc_word = get_fpc_csr();
131 f.fc_struct.flush = 1;
132 set_fpc_csr(f.fc_word);
136 // Main entry point; catch any exceptions that have made it this far.
137 int main ( int argc, char **argv ) {
139 // Enable floating-point exceptions for Linux/x86
140 #if defined(__linux__) && defined(__i386__)
148 // Enable floating-point exceptions for Windows
149 #if defined( _MSC_VER ) && defined( DEBUG )
150 // Christian, we should document what this does
151 _control87( _EM_INEXACT, _MCW_EM );
154 #if defined( HAVE_BC5PLUS )
155 _control87(MCW_EM, MCW_EM); /* defined in float.h */
158 // Keyboard focus hack
159 #if defined(__APPLE__) && !defined(OSX_BUNDLE)
163 fgOSInit (&argc, argv);
165 CPSGetCurrentProcess(&psn);
166 CPSSetProcessName(&psn, "FlightGear");
168 CPSSetFrontProcess(&psn);
172 // FIXME: add other, more specific
175 fgMainInit(argc, argv);
176 } catch (sg_throwable &t) {
177 // We must use cerr rather than
178 // logging, since logging may be
180 cerr << "Fatal error: " << t.getFormattedMessage()
181 << "\n (received from " << t.getOrigin() << ')' << endl;