[PATCH] D81997: [AArch64] SLSHardening: compute correct thunk name for X29.
Kristof Beyls via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Jun 17 02:40:20 PDT 2020
kristof.beyls created this revision.
kristof.beyls added a reviewer: ostannard.
Herald added subscribers: llvm-commits, danielkiss, hiraditya.
Herald added a project: LLVM.
The enum values for AArch64 registers are not all consecutive.
Therefore, the computation
"__llvm_slsblr_thunk_x" + utostr(Reg - AArch64::X0)
is not always correct. utostr(Reg - AArch64::X0) will not generate the
expected string for the registers that do not have consecutive values in
the enum.
This happened to work for most registers, but does not for AArch64::FP
(i.e. register X29).
This can get triggered when the X29 is not used as a frame pointer.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D81997
Files:
llvm/lib/Target/AArch64/AArch64SLSHardening.cpp
llvm/test/CodeGen/AArch64/speculation-hardening-sls.ll
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