Function fputrap_x87

freebsd/amd64/amd64/fpu.c:712–736

* Read the FP status and control words, then generate si_code value * for SIGFPE. The error code chosen will be one of the * FPE_... macros. It will be sent as the second argument to old * BSD-style signal handlers and as "siginfo_t->si_code" (second * argument) to SA_SIGINFO signal handlers. * * Some time ago, we cleared the x87 exceptions with FNCLEX there. * Clearing exceptions was nec

 * For XMM traps, the exceptions were never cleared.
 */
int
fputrap_x87(void)
{
	struct savefpu *pcb_save;
	u_short control, status;

	critical_enter();

	/*
	 * Interrupt handling (for another interrupt) may have pushed the
	 * state to memory.  Fetch the relevant parts of the state from
	 * wherever they are.
	 */
	if (PCPU_GET(fpcurthread) != curthread) {
		pcb_save = curpcb->pcb_save;
		control = pcb_save->sv_env.en_cw;
		status = pcb_save->sv_env.en_sw;
	} else {
		fnstcw(&control);
		fnstsw(&status);
	}

	critical_exit();
	return (fpetable[status & ((~control & 0x3f) | 0x40)]);
}

int
fputrap_sse(void)