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| author | Ulrich Weigand <Ulrich.Weigand@de.ibm.com> | 2013-12-04 06:45:56 -0600 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2013-12-04 07:41:38 -0600 |
| commit | b525166bb93b060e1146f0263b76a9c1e7455b06 (patch) | |
| tree | 11b27e8c03bf033a91edac3aa4fa42d0ffc5f24a | |
| parent | 7ec07d9a7b501f1b7d740fda02ba5f39d6d684e5 (diff) | |
| download | glibc-b525166bb93b060e1146f0263b76a9c1e7455b06.tar.gz glibc-b525166bb93b060e1146f0263b76a9c1e7455b06.tar.xz glibc-b525166bb93b060e1146f0263b76a9c1e7455b06.zip | |
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.
| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | nptl/sysdeps/powerpc/tls.h | 2 |
2 files changed, 6 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 4ac339664a..f56f9f6920 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,7 @@ +2013-12-04 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> + + * sysdeps/powerpc/tls.h (tcbhead_t): Add __private_ss field. + 2013-12-04 Alan Modra <amodra@gmail.com> * elf/elf.h (R_PPC64_TLSGD, R_PPC64_TLSLD, R_PPC64_TOCSAVE): Define. diff --git a/nptl/sysdeps/powerpc/tls.h b/nptl/sysdeps/powerpc/tls.h index 8e0ada6bfa..c21c0271ef 100644 --- a/nptl/sysdeps/powerpc/tls.h +++ b/nptl/sysdeps/powerpc/tls.h @@ -61,6 +61,8 @@ typedef union dtv 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; |