Hi Andrew,
I am not changing the TCB structure. I am placing it before TCB like the way done in IA64.
+# define TLS_PRE_TCB_SIZE \ + (sizeof (struct pthread) \ + + (PTHREAD_STRUCT_END_PADDING < 2 * sizeof (uintptr_t) \ + ? ((2 * sizeof (uintptr_t) + __alignof__ (struct pthread) - 1) \ + & ~(__alignof__ (struct pthread) - 1)) \ + : 0))
And accessing the stack guard in compiler will be like.
msr tpidr_el0, x0 ldr x1, [x0-8]
Let me know if this will have impact on your changes.
Attached is the RFC patch.
regards, Venkat.
On 19 August 2013 10:06, Pinski, Andrew Andrew.Pinski@caviumnetworks.comwrote:
I think changing TCB will be changing the ABI. So we don't want to do that I think. Also have you thought about how TCB changes are going to change ILP32 too. I am almost ready to submit the patches for ILP32 out for review on the binutils, glibc, gcc, and kernel lists.
Thanks, Andrew
*From:* linaro-toolchain-bounces@lists.linaro.org < linaro-toolchain-bounces@lists.linaro.org> on behalf of Venkataramanan Kumar venkataramanan.kumar@linaro.org *Sent:* Sunday, August 18, 2013 9:27 PM *To:* Linaro Toolchain *Subject:* [ACTIVITY] 12 - 16 August 2013
== Progress ==
- Libssp support for AArch64 TCWG 23: Understood the TCB datastructure. Sent a mail to the internal team on
the changes needed and where to put stack gaurd slot in TCB.
Got some comments from Matt. Worked on the changes in eglibc. Tested a simple stack smashing program in V8 model by moving the patched run time linker and glibc. Sent the RFC internally for review.
- 4 day week 15-August India naional holiday.
== Plan ==
- Post RFC patch for Libssp support for AArch64 in GCC and glibc TCWG-23
- Continue testing the patch for Libssp support for AArch64 in GCC and
glibc TCWG-23
- Backport and test revision 201406 to linaro branch.
== Issues ==
- LTO/PGO work stopped now since libssp support priority is more.
- Waiting for Marcus feedback for Matt comments on gprof patches TCWG-20.
Misc
23-August availing leave.