From 9c0fed3dcfd71bdd6c09a79a70b629db56c36e71 Mon Sep 17 00:00:00 2001
From: Doug Rabson <dfr@FreeBSD.org>
Date: Wed, 30 Dec 1998 10:38:59 +0000
Subject: Various changes to support OSF1 emulation:

* Move the user stack from VM_MAXUSER_ADDRESS to a place below the 32bit
  boundary (needed to support 32bit OSF programs).  This should also save
  one pagetable per process.
* Add cvtqlsv to the set of instructions handled by the floating point
  software completion code.
* Disable all floating point exceptions by default.
* A minor change to execve to allow the OSF1 image activator to support
  dynamic loading.
---
 sys/alpha/alpha/fp_emulate.c | 34 ++++++++++++++++++++++++++--------
 sys/alpha/alpha/machdep.c    | 10 +++++-----
 sys/alpha/alpha/trap.c       |  5 +++--
 sys/alpha/alpha/vm_machdep.c | 10 +++++-----
 sys/alpha/include/vmparam.h  | 12 ++++++++++--
 5 files changed, 49 insertions(+), 22 deletions(-)

(limited to 'sys/alpha')

diff --git a/sys/alpha/alpha/fp_emulate.c b/sys/alpha/alpha/fp_emulate.c
index 32ec7eeb310e7..d6dc1653e3837 100644
--- a/sys/alpha/alpha/fp_emulate.c
+++ b/sys/alpha/alpha/fp_emulate.c
@@ -23,7 +23,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id$
+ *	$Id: fp_emulate.c,v 1.1 1998/12/04 10:52:47 dfr Exp $
  */
 
 #include <sys/param.h>
@@ -208,6 +208,17 @@ static fp_register_t fp_reserved(union alpha_instruction ins,
     return GETREG(fpregs, ins.f_format.fc);
 }
 
+static fp_register_t fp_cvtql(union alpha_instruction ins,
+				 int src, int rnd,
+				 u_int64_t control, u_int64_t *status,
+				 struct fpreg *fpregs)
+
+{
+    fp_register_t fb = GETREG(fpregs, ins.f_format.fb);
+    *status |= FPCR_INV;
+    return ((fb.q & 0xc0000000) << 32 | (fb.q & 0x3fffffff) << 29);
+}
+
 static int fp_emulate(union alpha_instruction ins, struct proc *p)
 {
 	u_int64_t control = p->p_addr->u_pcb.pcb_fp_control;
@@ -235,11 +246,13 @@ static int fp_emulate(union alpha_instruction ins, struct proc *p)
 	u_int64_t status;
 
 	/*
-	 * Only attempt to emulate ieee instructions.
+	 * Only attempt to emulate ieee instructions & integer overflow
 	 */
-	if (ins.common.opcode != op_flti)
+	if ((ins.common.opcode != op_flti) &&
+	    (ins.f_format.function != fltl_cvtqlsv)){
+		printf("fp_emulate: unhandled opcode = 0x%x, fun = 0x%x\n",ins.common.opcode,ins.f_format.function);
 		return 0;
-
+	}
 	/*
 	 * Dump the float registers into the pcb so we can get at
 	 * them.
@@ -259,10 +272,15 @@ static int fp_emulate(union alpha_instruction ins, struct proc *p)
 	if (rnd == 3)
 		rnd = (fpregs->fpr_cr >> FPCR_DYN_SHIFT) & 3;
 	status = 0;
-	result = ops[ins.f_format.function & 0xf](ins, src, rnd,
-						  control, &status,
-						  fpregs);
-
+	if (ins.common.opcode == op_fltl
+	   && ins.f_format.function == fltl_cvtqlsv)
+		result = fp_cvtql(ins, src, rnd, control, &status,
+				  fpregs);
+	else
+		result = ops[ins.f_format.function & 0xf](ins, src, rnd,
+							  control, &status,
+							  fpregs);
+	
 	/*
 	 * Handle exceptions.
 	 */
diff --git a/sys/alpha/alpha/machdep.c b/sys/alpha/alpha/machdep.c
index 39090de0c42dc..64de963593c52 100644
--- a/sys/alpha/alpha/machdep.c
+++ b/sys/alpha/alpha/machdep.c
@@ -23,7 +23,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: machdep.c,v 1.27 1998/12/16 16:28:56 bde Exp $
+ *	$Id: machdep.c,v 1.28 1998/12/23 11:50:50 dfr Exp $
  */
 /*-
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -1474,11 +1474,11 @@ setregs(struct proc *p, u_long entry, u_long stack)
 
 	bzero(tfp->tf_regs, FRAME_SIZE * sizeof tfp->tf_regs[0]);
 	bzero(&p->p_addr->u_pcb.pcb_fp, sizeof p->p_addr->u_pcb.pcb_fp);
-	p->p_addr->u_pcb.pcb_fp_control = (IEEE_TRAP_ENABLE_INV
-					   | IEEE_TRAP_ENABLE_DZE
-					   | IEEE_TRAP_ENABLE_OVF);
+	p->p_addr->u_pcb.pcb_fp_control = 0;
 	p->p_addr->u_pcb.pcb_fp.fpr_cr = (FPCR_DYN_NORMAL
-					  | FPCR_INED | FPCR_UNFD);
+					  | FPCR_INVD | FPCR_DZED
+					  | FPCR_OVFD | FPCR_INED
+					  | FPCR_UNFD);
 
 	alpha_pal_wrusp(stack);
 	tfp->tf_regs[FRAME_PS] = ALPHA_PSL_USERSET;
diff --git a/sys/alpha/alpha/trap.c b/sys/alpha/alpha/trap.c
index 1811faca31536..107f1b06a6de9 100644
--- a/sys/alpha/alpha/trap.c
+++ b/sys/alpha/alpha/trap.c
@@ -1,4 +1,4 @@
-/* $Id: trap.c,v 1.8 1998/12/04 22:54:42 archie Exp $ */
+/* $Id: trap.c,v 1.9 1998/12/16 15:21:50 bde Exp $ */
 /* $NetBSD: trap.c,v 1.31 1998/03/26 02:21:46 thorpej Exp $ */
 
 /*
@@ -450,7 +450,8 @@ trap(a0, a1, a2, entry, framep)
 			 * we need to reflect that as an access error.
 			 */
 			if (map != kernel_map &&
-			    (caddr_t)va >= vm->vm_maxsaddr) {
+			    (caddr_t)va >= vm->vm_maxsaddr
+			    && (caddr_t)va < (caddr_t)USRSTACK) {
 				if (rv == KERN_SUCCESS) {
 					unsigned nss;
 	
diff --git a/sys/alpha/alpha/vm_machdep.c b/sys/alpha/alpha/vm_machdep.c
index e8507857689bf..592a089d11c70 100644
--- a/sys/alpha/alpha/vm_machdep.c
+++ b/sys/alpha/alpha/vm_machdep.c
@@ -38,7 +38,7 @@
  *
  *	from: @(#)vm_machdep.c	7.3 (Berkeley) 5/13/91
  *	Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
- *	$Id: vm_machdep.c,v 1.5 1998/12/04 10:52:47 dfr Exp $
+ *	$Id: vm_machdep.c,v 1.6 1998/12/16 15:21:50 bde Exp $
  */
 /*
  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@@ -151,11 +151,11 @@ cpu_fork(p1, p2)
 	 * Set the floating point state.
 	 */
 	if ((p2->p_addr->u_pcb.pcb_fp_control & IEEE_INHERIT) == 0) {
-		p2->p_addr->u_pcb.pcb_fp_control = (IEEE_TRAP_ENABLE_INV
-						    | IEEE_TRAP_ENABLE_DZE
-						    | IEEE_TRAP_ENABLE_OVF);
+		p2->p_addr->u_pcb.pcb_fp_control = 0;
 		p2->p_addr->u_pcb.pcb_fp.fpr_cr = (FPCR_DYN_NORMAL
-						   | FPCR_INED | FPCR_UNFD);
+						   | FPCR_INVD | FPCR_DZED
+						   | FPCR_OVFD | FPCR_INED
+						   | FPCR_UNFD);
 	}
 
 	/*
diff --git a/sys/alpha/include/vmparam.h b/sys/alpha/include/vmparam.h
index fead056e3d0c4..04c62a65a5460 100644
--- a/sys/alpha/include/vmparam.h
+++ b/sys/alpha/include/vmparam.h
@@ -1,4 +1,4 @@
-/* $Id: vmparam.h,v 1.2 1998/06/10 10:55:30 dfr Exp $ */
+/* $Id: vmparam.h,v 1.3 1998/06/14 13:45:15 dfr Exp $ */
 /* From: NetBSD: vmparam.h,v 1.6 1997/09/23 23:23:23 mjacob Exp */
 #ifndef	_ALPHA_VMPARAM_H
 #define	_ALPHA_VMPARAM_H
@@ -54,7 +54,15 @@
  * kernel stack.
  */
 #define	USRTEXT		CLBYTES
-#define	USRSTACK	VM_MAXUSER_ADDRESS
+/* #define	USRSTACK	VM_MAXUSER_ADDRESS */
+
+/*
+ * This stack location is suitable for OSF1 emulation.  Some OSF
+ * programs are built as 32bit and assume that the stack is reachable
+ * with a 32bit value.  OSF1 manages to have a variable location for
+ * the user stack which we should probably also support.
+ */
+#define USRSTACK	(0x12000000LL - (UPAGES*PAGE_SIZE))
 
 /*
  * Virtual memory related constants, all in bytes
-- 
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