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8 Commits

Author SHA1 Message Date
Kazu Hirata
39185b091b [llvm] Remove redundant return and continue statements (NFC) 
Identified with readability-redundant-control-flow.
 2021-01-14 20:30:34 -08:00
Yuanfang Chen
54a5a78649 [NFC] Clean up uses of MachineModuleInfoWrapperPass 2020-07-01 09:45:05 -07:00
Kristof Beyls
5fc1ee97f5 [IndirectThunks] Make generated MF structure as expected by all instruction selectors. 
This also enables running the AArch64 SLSHardening pass with GlobalISel,
so add a test for that.

Differential Revision: https://reviews.llvm.org/D81403
 2020-06-18 06:44:53 +01:00
Kristof Beyls
c44f71b357 [NFC] Refactor ThunkInserter to make it available for all targets. 
By moving target-independent code from
llvm/lib/Target/X86/X86IndirectThunks.cpp
to
llvm/include/llvm/CodeGen/IndirectThunks.h

Differential Revision: https://reviews.llvm.org/D81401
 2020-06-11 08:38:44 +01:00
Simon Pilgrim
18a9db3146 X86Subtarget.h - remove unnecessary TargetMachine.h include. NFC. 
By moving X86Subtarget::isPositionIndependent() into X86Subtarget.cpp we can remove the header dependency and move the few uses into source files.
 2020-05-24 12:30:22 +01:00
Scott Constable
8178fe0f86 [X86] Add Indirect Thunk Support to X86 to mitigate Load Value Injection (LVI) 
This pass replaces each indirect call/jump with a direct call to a thunk that looks like:

lfence
jmpq *%r11

This ensures that if the value in register %r11 was loaded from memory, then
the value in %r11 is (architecturally) correct prior to the jump.
Also adds a new target feature to X86: +lvi-cfi
("cfi" meaning control-flow integrity)
The feature can be added via clang CLI using -mlvi-cfi.

This is an alternate implementation to https://reviews.llvm.org/D75934 That merges the thunk insertion functionality with the existing X86 retpoline code.

Differential Revision: https://reviews.llvm.org/D76812
 2020-04-03 00:34:39 -07:00
Scott Constable
f8acc0c70c [X86] Refactor X86IndirectThunks.cpp to Accommodate Mitigations other than Retpoline 
Introduce a ThunkInserter CRTP base class from which new thunk types can inherit, e.g., thunks to mitigate https://software.intel.com/security-software-guidance/software-guidance/load-value-injection.

Differential Revision: https://reviews.llvm.org/D76811
 2020-04-02 22:09:54 -07:00
Scott Constable
04c04cabf9 [X86][NFC] Generalize the naming of "Retpoline Thunks" and related code to "Indirect Thunks" 
There are applications for indirect call/branch thunks other than retpoline for Spectre v2, e.g.,

https://software.intel.com/security-software-guidance/software-guidance/load-value-injection

Therefore it makes sense to refactor X86RetpolineThunks as a more general capability.

Differential Revision: https://reviews.llvm.org/D76810
 2020-04-02 21:55:13 -07:00