Back out previous, it appears to be broken.

4 files changed, 7 insertions, 30 deletions

diff --git a/sys/arch/i386/i386/machdep.c b/sys/arch/i386/i386/machdep.c
index 940359f4f7a..62e395b4e89 100644
--- a/sys/arch/i386/i386/machdep.c
+++ b/sys/arch/i386/i386/machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: machdep.c,v 1.482 2010/09/29 13:46:38 joshe Exp $	*/
+/*	$OpenBSD: machdep.c,v 1.483 2010/09/29 15:11:31 joshe Exp $	*/
 /*	$NetBSD: machdep.c,v 1.214 1996/11/10 03:16:17 thorpej Exp $	*/
 
 /*-
@@ -2362,12 +2362,9 @@ sys_sigreturn(struct proc *p, void *v, register_t *retval)
 		npxsave_proc(p, 0);
 
 	if (context.sc_fpstate) {
-		union savefpu *sfp = &p->p_addr->u_pcb.pcb_savefpu;
-
-		if ((error = copyin(context.sc_fpstate, sfp, sizeof(*sfp))))
+		if ((error = copyin(context.sc_fpstate,
+		    &p->p_addr->u_pcb.pcb_savefpu, sizeof (union savefpu))))
 			return (error);
-		if (i386_use_fxsave)
-			sfp->sv_xmm.sv_env.en_mxcsr &= fpu_mxcsr_mask;
 		p->p_md.md_flags |= MDP_USEDFPU;
 	}
 
diff --git a/sys/arch/i386/i386/process_machdep.c b/sys/arch/i386/i386/process_machdep.c
index 3a8146edaa6..f46666594da 100644
--- a/sys/arch/i386/i386/process_machdep.c
+++ b/sys/arch/i386/i386/process_machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: process_machdep.c,v 1.24 2010/09/29 13:46:38 joshe Exp $	*/
+/*	$OpenBSD: process_machdep.c,v 1.25 2010/09/29 15:11:31 joshe Exp $	*/
 /*	$NetBSD: process_machdep.c,v 1.22 1996/05/03 19:42:25 christos Exp $	*/
 
 /*
@@ -137,7 +137,6 @@ process_fninit_xmm(struct savexmm *sxmm)
 	memset(sxmm, 0, sizeof(*sxmm));
 	sxmm->sv_env.en_cw = __OpenBSD_NPXCW__;
 	sxmm->sv_env.en_mxcsr = __INITIAL_MXCSR__;
-	sxmm->sv_env.en_mxcsr_mask = fpu_mxcsr_mask;
 	sxmm->sv_env.en_sw = 0x0000;
 	sxmm->sv_env.en_tw = 0x00;
 }
@@ -309,7 +308,6 @@ process_write_fpregs(struct proc *p, struct fpreg *regs)
 		/* XXX Yuck. */
 		memcpy(&s87, regs, sizeof(*regs));
 		process_s87_to_xmm(&s87, &frame->sv_xmm);
-		frame->sv_xmm.sv_env.en_mxcsr &= fpu_mxcsr_mask;
 	} else
 		memcpy(&frame->sv_87, regs, sizeof(*regs));
 
diff --git a/sys/arch/i386/include/npx.h b/sys/arch/i386/include/npx.h
index 44c26da86cd..7b92a8693fb 100644
--- a/sys/arch/i386/include/npx.h
+++ b/sys/arch/i386/include/npx.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: npx.h,v 1.14 2010/09/29 13:46:38 joshe Exp $	*/
+/*	$OpenBSD: npx.h,v 1.15 2010/09/29 15:11:31 joshe Exp $	*/
 /*	$NetBSD: npx.h,v 1.11 1994/10/27 04:16:11 cgd Exp $	*/
 
 /*-
@@ -96,7 +96,7 @@ struct envxmm {
 	uint16_t en_fos;	/* FPU Data pointer selector */
 	uint16_t en_rsvd2;
 	uint32_t en_mxcsr;	/* MXCSR Register State */
-	uint32_t en_mxcsr_mask; /* Mask for valid MXCSR bits (may be 0) */
+	uint32_t en_rsvd3;
 };
 
 /* FPU regsters in the extended save format. */
@@ -142,7 +142,6 @@ struct	emcsts {
  * Set Reference, pg. 3-369.
  */
 #define __INITIAL_MXCSR__       0x1f80
-#define __INITIAL_MXCSR_MASK__	0xffbf
 
 /*
  * The standard control word from finit is 0x37F, giving:
@@ -159,8 +158,6 @@ void    process_s87_to_xmm(const struct save87 *, struct savexmm *);
 struct cpu_info;
 struct trapframe;
 
-extern uint32_t	fpu_mxcsr_mask;
-
 void	npxinit(struct cpu_info *);
 void	npxtrap(struct trapframe *);
 void	fpu_kernel_enter(void);
diff --git a/sys/arch/i386/isa/npx.c b/sys/arch/i386/isa/npx.c
index f7a45535f91..ade5e5872f2 100644
--- a/sys/arch/i386/isa/npx.c
+++ b/sys/arch/i386/isa/npx.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: npx.c,v 1.52 2010/09/29 13:46:38 joshe Exp $	*/
+/*	$OpenBSD: npx.c,v 1.53 2010/09/29 15:11:31 joshe Exp $	*/
 /*	$NetBSD: npx.c,v 1.57 1996/05/12 23:12:24 mycroft Exp $	*/
 
 #if 0
@@ -97,11 +97,6 @@
 #define	clts()			__asm("clts")
 #define	stts()			lcr0(rcr0() | CR0_TS)
 
-/*
- * The mxcsr_mask for this host, taken from fxsave() on the primary CPU
- */
-uint32_t	fpu_mxcsr_mask;
-
 int npxintr(void *);
 static int npxprobe1(struct isa_attach_args *);
 static int x86fpflags_to_siginfo(u_int32_t);
@@ -356,16 +351,6 @@ npxinit(struct cpu_info *ci)
 		printf("%s: WARNING: Pentium FDIV bug detected!\n",
 		    ci->ci_dev.dv_xname);
 	}
-	if (CPU_IS_PRIMARY(ci) && i386_use_fxsave) {
-		struct savexmm xm __attribute__((aligned(16)));
-
-		bzero(&xm, sizeof(xm));
-		fxsave(&xm);
-		if (xm.sv_env.en_mxcsr_mask)
-			fpu_mxcsr_mask = xm.sv_env.en_mxcsr_mask;
-		else
-			fpu_mxcsr_mask = __INITIAL_MXCSR_MASK__;
-	}
 	lcr0(rcr0() | (CR0_TS));
 }