Author: andrew
Date: Sat Jan 26 08:55:04 2013
New Revision: 245942
URL: http://svnweb.freebsd.org/changeset/base/245942
Log:
Align td_frame as it will be placed into the sp register which must be
8 byte aligned on ARM EABI.
Modified:
head/sys/arm/arm/vm_machdep.c
Modified: head/sys/arm/arm/vm_machdep.c
==============================================================================
--- head/sys/arm/arm/vm_machdep.c Sat Jan 26 05:27:00 2013
(r245941)
+++ head/sys/arm/arm/vm_machdep.c Sat Jan 26 08:55:04 2013
(r245942)
@@ -398,6 +398,12 @@ cpu_thread_alloc(struct thread *td)
PAGE_SIZE) - 1;
td->td_frame = (struct trapframe *)
((u_int)td->td_kstack + USPACE_SVC_STACK_TOP - sizeof(struct pcb))
- 1;
+ /*
+ * Ensure td_frame is aligned to an 8 byte boundary as it will be
+ * placed into the stack pointer which must be 8 byte aligned in
+ * the ARM EABI.
+ */
+ td->td_frame = (struct trapframe *)((u_int)td->td_frame & ~7);
#ifdef __XSCALE__
#ifndef CPU_XSCALE_CORE3
pmap_use_minicache(td->td_kstack, td->td_kstack_pages * PAGE_SIZE);
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