This will work, except it will be -4 and w1 for ILP32.

Thanks, Andrew Pinski ________________________________ From: Venkataramanan Kumar venkataramanan.kumar@linaro.org Sent: Sunday, August 18, 2013 10:09 PM To: Pinski, Andrew Cc: Linaro Toolchain Subject: Re: [ACTIVITY] 12 - 16 August 2013

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.commailto:Andrew.Pinski@caviumnetworks.com> wrote: 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.orgmailto:linaro-toolchain-bounces@lists.linaro.org <linaro-toolchain-bounces@lists.linaro.orgmailto:linaro-toolchain-bounces@lists.linaro.org> on behalf of Venkataramanan Kumar <venkataramanan.kumar@linaro.orgmailto: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.