Author: nwhitehorn
Date: Thu Sep 5 23:00:24 2013
New Revision: 255273
URL: http://svnweb.freebsd.org/changeset/base/255273
Log:
Align stacks of kernel threads correctly at 16-byte boundaries rather than
making sure they are all misaligned at +8 bytes. This fixes clang builds
of powerpc64 kernels (aside from a required increase in KSTACK_PAGES which
will come later).
This commit from FreeBSD/powerpc64 with a clang-built kernel.
MFC after: 2 weeks
Modified:
head/sys/powerpc/aim/vm_machdep.c
head/sys/powerpc/include/frame.h
Modified: head/sys/powerpc/aim/vm_machdep.c
==============================================================================
--- head/sys/powerpc/aim/vm_machdep.c Thu Sep 5 22:59:18 2013
(r255272)
+++ head/sys/powerpc/aim/vm_machdep.c Thu Sep 5 23:00:24 2013
(r255273)
@@ -187,6 +187,7 @@ cpu_fork(struct thread *td1, struct proc
cf->cf_arg1 = (register_t)tf;
pcb->pcb_sp = (register_t)cf;
+ KASSERT(pcb->pcb_sp % 16 == 0, ("stack misaligned"));
#ifdef __powerpc64__
pcb->pcb_lr = ((register_t *)fork_trampoline)[0];
pcb->pcb_toc = ((register_t *)fork_trampoline)[1];
Modified: head/sys/powerpc/include/frame.h
==============================================================================
--- head/sys/powerpc/include/frame.h Thu Sep 5 22:59:18 2013
(r255272)
+++ head/sys/powerpc/include/frame.h Thu Sep 5 23:00:24 2013
(r255273)
@@ -94,6 +94,7 @@ struct callframe {
register_t cf_func;
register_t cf_arg0;
register_t cf_arg1;
+ register_t _padding; /* Maintain 16-byte alignment */
};
#else
struct callframe {
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