C++ (Cpp) fpenv Examples

Example #1

File: main.c Project: carriercomm/plan9-gpl

/*
 *  math coprocessor error
 */
static void
matherror(Ureg *ur, void*)
{
	ulong status, pc;

	/*
	 *  a write cycle to port 0xF0 clears the interrupt latch attached
	 *  to the error# line from the 387
	 */
	if(!(m->cpuiddx & Fpuonchip))
		outb(0xF0, 0xFF);

	/*
	 *  save floating point state to check out error
	 */
	fpenv(&up->fpsave);	/* result ignored, but masks fp exceptions */
	fpsave(&up->fpsave);		/* also turns fpu off */
	fpon();
	mathnote();

	if((ur->pc & 0xf0000000) == KZERO){
		mathstate(&status, &pc, nil);
		panic("fp: status %#lux fppc=%#lux pc=%#lux", status, pc, ur->pc);
	}
}

Example #2

File: main.c Project: Fluray/NxM

/*
 *  math coprocessor error
 */
static void
matherror(Ureg *ur, void*)
{
	ulong status, pc;

	/*
	 *  a write cycle to port 0xF0 clears the interrupt latch attached
	 *  to the error# line from the 387
	 */
	if(!(m->cpuiddx & 0x01))
		outb(0xF0, 0xFF);

	fpalloc();

	/*
	 *  save floating point state to check out error
	 */
	fpenv(&up->fpsave);
	mathnote();

	if((ur->pc & 0xf0000000) == KZERO){
		mathstate(&status, &pc, nil);
		panic("fp: status %#lux fppc=%#lux pc=%#lux", status, pc, ur->pc);
	}
}

Example #3

File: main.c Project: vrthra/9front-tmp

/*
 *  math coprocessor error
 */
static void
matherror(Ureg *ur, void*)
{
	/*
	 *  a write cycle to port 0xF0 clears the interrupt latch attached
	 *  to the error# line from the 387
	 */
	if(!(m->cpuiddx & 0x01))
		outb(0xF0, 0xFF);

	/*
	 *  save floating point state to check out error
	 */
	fpenv(&up->fpsave);
	mathnote();

	if((ur->pc & 0xf0000000) == KZERO)
		panic("fp: status %ux fppc=0x%lux pc=0x%lux",
			up->fpsave.status, up->fpsave.pc, ur->pc);
}