forked from OSchip/llvm-project
e6d0b851f8
This patch implements the following: - Emit PACBTI-M build attributes in libunwind asm files - Authenticate LR in DWARF32 using PACBTI Use Armv8.1-M.Main PACBTI extension to authenticate the return address (stored in the LR register) before moving it to the PC (IP) register. The AUTG instruction is used with the candidate return address, the CFA, and the authentication code that is retrieved from the saved pseudo-register RA_AUTH_CODE. - Authenticate LR in EHABI using PACBTI Authenticate the contents of the LR register using Armv8.1-M.Main PACBTI extension. A new frame unwinding instruction is introduced (0xb4). This instruction pops out of the stack the return address authentication code, which is then used in conjunction with the SP and the next-to-be instruction pointer to perform authentication. This authentication code is popped into a new register, UNW_ARM_PSEUDO_PAC, which is a pseudo-register. This patch is part of a series that adds support for the PACBTI-M extension of the Armv8.1-M architecture, as detailed here: https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/armv8-1-m-pointer-authentication-and-branch-target-identification-extension The PACBTI-M specification can be found in the Armv8-M Architecture Reference Manual: https://developer.arm.com/documentation/ddi0553/latest The following people contributed to this patch: - Momchil Velikov - Victor Campos - Ties Stuij Reviewed By: #libunwind, danielkiss, mstorsjo Differential Revision: https://reviews.llvm.org/D112430 |
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| .. | ||
| mach-o | ||
| __libunwind_config.h | ||
| libunwind.h | ||
| unwind.h | ||
| unwind_arm_ehabi.h | ||
| unwind_itanium.h | ||