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3 Commits

Author SHA1 Message Date
Peter Collingbourne 35fcc294ab AArch64: Don't emit CFI for SCS register in nounwind functions. 
All that you can legitimately do with the CFI for a nounwind function
is get a backtrace, and adjusting the SCS register is not (currently)
required for this purpose.

Differential Revision: https://reviews.llvm.org/D54988

llvm-svn: 348035
 2018-11-30 21:04:25 +00:00
Peter Collingbourne 527024469a AArch64: Emit a call frame instruction for the shadow call stack register. 
When unwinding past a function that uses shadow call stack, we must
subtract 8 from the value of the x18 register. This patch causes us
to emit a call frame instruction that causes that to happen.

Differential Revision: https://reviews.llvm.org/D54609

llvm-svn: 347089
 2018-11-16 20:08:54 +00:00
Peter Collingbourne f11eb3ebe7 AArch64: Implement support for the shadowcallstack attribute. 
The implementation of shadow call stack on aarch64 is quite different to
the implementation on x86_64. Instead of reserving a segment register for
the shadow call stack, we reserve the platform register, x18. Any function
that spills lr to sp also spills it to the shadow call stack, a pointer to
which is stored in x18.

Differential Revision: https://reviews.llvm.org/D45239

llvm-svn: 329236
 2018-04-04 21:55:44 +00:00