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# commit b525166bb93b060e1146f0263b76a9c1e7455b06
# Author: Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
# Date: Wed Dec 4 06:45:56 2013 -0600
#
# PowerPC64: Add __private_ss field to TCB header
#
# The TCB header on Intel contains a field __private_ss that is used
# to efficiently implement the -fsplit-stack GCC feature.
#
# In order to prepare for a possible future implementation of that
# feature on powerpc64, we'd like to reserve a similar field in
# the TCB header as well. (It would be good if this went in with
# or before the ELFv2 patches to ensure that this field will be
# available always in the ELFv2 environment.)
#
# The field needs to be added at the front of tcbhead_t structure
# to avoid changing the ABI; see the recent discussion when adding
# the EBB fields.
#
---
# nptl/sysdeps/powerpc/tls.h | 2 ++
# 1 file changed, 2 insertions(+)
#
--- a/nptl/sysdeps/powerpc/tls.h
+++ b/nptl/sysdeps/powerpc/tls.h
@@ -61,6 +61,8 @@
are private. */
typedef struct
{
+ /* GCC split stack support. */
+ void *__private_ss;
/* Reservation for the Event-Based Branching ABI. */
uintptr_t ebb_handler;
uintptr_t ebb_ctx_pointer;
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