Backout changes trying to inherit floating-point environment, although

POSIX (susv3) requires this, but it is unclear what should be inherited,
duplicating whole 387 stack for new thread seems to be unnecessary and
dangerous. Revert to previous code, force a new thread to be started with
clean FP state.

1 files changed, 0 insertions, 35 deletions

diff --git a/sys/i386/isa/npx.c b/sys/i386/isa/npx.c
index 129a853..bc39629 100644
--- a/sys/i386/isa/npx.c
+++ b/sys/i386/isa/npx.c
@@ -942,41 +942,6 @@ npxsetregs(td, addr)
 	curthread->td_pcb->pcb_flags |= PCB_NPXINITDONE;
 }
 
-/*
- * POSIX requires new thread to inherit floating-point environment.
- */
-void
-npx_fork_thread(struct thread *td, struct thread *newtd)
-{
-	union savefpu	*state;
-	u_int32_t	mxcsr;
-	u_int32_t	cw;
-
-	if (!(td->td_pcb->pcb_flags & PCB_NPXINITDONE)) {
-		newtd->td_pcb->pcb_flags &= ~PCB_NPXINITDONE;
-		return;
-	}
-		
-	state = &newtd->td_pcb->pcb_save;
-	/* get control word */
-	if (npxgetregs(td, state))
-		return;
-	if (cpu_fxsr) {
-		mxcsr = state->sv_xmm.sv_env.en_mxcsr;
-		cw = state->sv_xmm.sv_env.en_cw;
-	} else {
-		cw = state->sv_87.sv_env.en_cw;
-		mxcsr = 0;
-	}
-	bcopy(&npx_cleanstate, state, sizeof(*state));
-	if (cpu_fxsr) {
-		state->sv_xmm.sv_env.en_cw = cw;
-		state->sv_xmm.sv_env.en_mxcsr = mxcsr;
-	} else
-		state->sv_87.sv_env.en_cw = cw;
-	newtd->td_pcb->pcb_flags |= PCB_NPXINITDONE;
-}
-
 static void
 fpusave(addr)
 	union savefpu *addr;