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This set of changes enable support for the ARMv8.1-m PACBTI extensions [1]. The goal of the PACBTI extensions is similar in scope to that of a-profile PAC/BTI (aarch64 only), but the underlying implementation is different. One important difference is that the pointer authentication code is stored in a separate register, thus we don't need to mask/unmask the return address from a function in order to produce a correct backtrace. The patch introduces the following modifications: - Extend the prologue analyser for 32-bit ARM to handle some instructions from ARMv8.1-m PACBTI: pac, aut, pacg, autg and bti. Also keep track of return address signing/authentication instructions. - Adds code to identify object file attributes that indicate the presence of ARMv8.1-m PACBTI (Tag_PAC_extension, Tag_BTI_extension, Tag_PACRET_use and Tag_BTI_use). - Adds support for DWARF pseudo-register RA_AUTH_CODE, as described in the aadwarf32 [2]. - Extends the dwarf unwinder to track the value of RA_AUTH_CODE. - Decorates backtraces with the "[PAC]" identifier when a frame has signed the return address. - Makes GDB aware of a new XML feature "org.gnu.gdb.arm.m-profile-pacbti". This feature is not included as an XML file on GDB's side because it is only supported for bare metal targets. - Additional documentation. [1] https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/armv8-1-m-pointer-authentication-and-branch-target-identification-extension [2] https://github.com/ARM-software/abi-aa/blob/main/aadwarf32/aadwarf32.rst |
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| agentexpr.texi | ||
| all-cfg.texi | ||
| annotate.texinfo | ||
| ChangeLog-1991-2021 | ||
| doxy-index.in | ||
| Doxyfile-base.in | ||
| Doxyfile-gdb-api.in | ||
| Doxyfile-gdb-xref.in | ||
| Doxyfile-gdbserver.in | ||
| fdl.texi | ||
| filter-for-doxygen | ||
| filter-params.pl | ||
| gdb.texinfo | ||
| gpl.texi | ||
| guile.texi | ||
| lpsrc.sed | ||
| Makefile.in | ||
| psrc.sed | ||
| python.texi | ||
| refcard.tex | ||
| stabs.texinfo | ||
| stack_frame.eps | ||
| stack_frame.pdf | ||
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| stack_frame.txt | ||
