commit f5bdee7fdf15e0c3bf77b215aea073b1beee3c02
author Tamas Petz <tamas.petz@arm.com> Mon Aug 31 15:09:40 2020 +0200
committer Tamas Petz <tamas.petz@arm.com> Fri Sep 04 11:29:12 2020 +0200
tree eaa80660696f16cd6a3337355806f05058084089
parent 18621fb30c50e7ee8bc71001a4f42236d29a6133

libc: Add Armv8.3-A PAuth and Armv8.5-A BTI compatibility to *.S

The most notable change is in sigsetjmp/siglongjmp. The former
stores LR signed with the current SP into jmp_buf. Calling siglongjmp
reads a signed LR and the corresponding SP from jmp_buf. This way not
only the checksum provides some means of integrity protection but
Pointer Authentication too.

Test: Tested on FVP with BTI enabled.

Change-Id: I9d720239775f8d2829a677901f546c4b14b5cbe5

libc/arch-arm64/static_function_dispatch.S

diff --git a/libc/arch-arm64/static_function_dispatch.S b/libc/arch-arm64/static_function_dispatch.S
index 65a1492..161ece8 100644
--- a/libc/arch-arm64/static_function_dispatch.S
+++ b/libc/arch-arm64/static_function_dispatch.S
@@ -42,3 +42,5 @@
 FUNCTION_DELEGATE(strlen, __strlen_aarch64_mte)
 FUNCTION_DELEGATE(strrchr, __strrchr_aarch64_mte)
 FUNCTION_DELEGATE(strncmp, __strncmp_aarch64_mte)
+
+NOTE_GNU_PROPERTY()