svn commit: r263913 - head/sys/arm/arm
Andrew Turner
andrew at FreeBSD.org
Sat Mar 29 14:17:05 UTC 2014
Author: andrew
Date: Sat Mar 29 14:17:04 2014
New Revision: 263913
URL: http://svnweb.freebsd.org/changeset/base/263913
Log:
Initialise fpscr to a sane value when we create the pcb. This sets NaNs to
be the default NaN and for denormalised numbers to be flushed to zero.
Modified:
head/sys/arm/arm/machdep.c
head/sys/arm/arm/vm_machdep.c
Modified: head/sys/arm/arm/machdep.c
==============================================================================
--- head/sys/arm/arm/machdep.c Sat Mar 29 11:56:33 2014 (r263912)
+++ head/sys/arm/arm/machdep.c Sat Mar 29 14:17:04 2014 (r263913)
@@ -101,6 +101,7 @@ __FBSDID("$FreeBSD$");
#include <machine/reg.h>
#include <machine/trap.h>
#include <machine/undefined.h>
+#include <machine/vfp.h>
#include <machine/vmparam.h>
#include <machine/sysarch.h>
@@ -990,6 +991,7 @@ init_proc0(vm_offset_t kstack)
(thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
thread0.td_pcb->pcb_flags = 0;
thread0.td_pcb->pcb_vfpcpu = -1;
+ thread0.td_pcb->pcb_vfpstate.fpscr = VFPSCR_DN | VFPSCR_FZ;
thread0.td_frame = &proc0_tf;
pcpup->pc_curpcb = thread0.td_pcb;
}
Modified: head/sys/arm/arm/vm_machdep.c
==============================================================================
--- head/sys/arm/arm/vm_machdep.c Sat Mar 29 11:56:33 2014 (r263912)
+++ head/sys/arm/arm/vm_machdep.c Sat Mar 29 14:17:04 2014 (r263913)
@@ -74,6 +74,7 @@ __FBSDID("$FreeBSD$");
#include <vm/uma_int.h>
#include <machine/md_var.h>
+#include <machine/vfp.h>
/*
* struct switchframe and trapframe must both be a multiple of 8
@@ -147,6 +148,7 @@ cpu_fork(register struct thread *td1, re
pcb2->un_32.pcb32_sp = td2->td_kstack +
USPACE_SVC_STACK_TOP - sizeof(*pcb2);
pcb2->pcb_vfpcpu = -1;
+ pcb2->pcb_vfpstate.fpscr = VFPSCR_DN | VFPSCR_FZ;
pmap_activate(td2);
td2->td_frame = tf = (struct trapframe *)STACKALIGN(
pcb2->un_32.pcb32_sp - sizeof(struct trapframe));
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