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32 lines
1.3 KiB
32 lines
1.3 KiB
7 years ago
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# commit b525166bb93b060e1146f0263b76a9c1e7455b06
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# Author: Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
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# Date: Wed Dec 4 06:45:56 2013 -0600
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#
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# PowerPC64: Add __private_ss field to TCB header
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#
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# The TCB header on Intel contains a field __private_ss that is used
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# to efficiently implement the -fsplit-stack GCC feature.
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#
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# In order to prepare for a possible future implementation of that
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# feature on powerpc64, we'd like to reserve a similar field in
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# the TCB header as well. (It would be good if this went in with
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# or before the ELFv2 patches to ensure that this field will be
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# available always in the ELFv2 environment.)
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#
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# The field needs to be added at the front of tcbhead_t structure
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# to avoid changing the ABI; see the recent discussion when adding
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# the EBB fields.
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#
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diff -urN glibc-2.17-c758a686/nptl/sysdeps/powerpc/tls.h glibc-2.17-c758a686/nptl/sysdeps/powerpc/tls.h
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--- glibc-2.17-c758a686/nptl/sysdeps/powerpc/tls.h 2014-05-29 13:19:25.000000000 -0500
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+++ glibc-2.17-c758a686/nptl/sysdeps/powerpc/tls.h 2014-05-29 13:19:25.000000000 -0500
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@@ -61,6 +61,8 @@
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are private. */
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typedef struct
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{
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+ /* GCC split stack support. */
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+ void *__private_ss;
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/* Reservation for the Event-Based Branching ABI. */
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uintptr_t ebb_handler;
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uintptr_t ebb_ctx_pointer;
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