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llvm-project/llvm/lib/Target/BPF
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Yonghong Song a27c998c00 [BPF] fix a CO-RE issue with -mattr=+alu32 
Ilya Leoshkevich (<iii@linux.ibm.com>) reported an issue that
with -mattr=+alu32 CO-RE has a segfault in BPF MISimplifyPatchable
pass.

The pattern will be transformed by MISimplifyPatchable
pass looks like below:
  r5 = ld_imm64 @"b:0:0$0:0"
  r2 = ldw r5, 0
  ... r2 ... // use r2
The pass will remove the intermediate 'ldw' instruction
and replacing all r2 with r5 likes below:
  r5 = ld_imm64 @"b:0:0$0:0"
  ... r5 ... // use r5
Later, the ld_imm64 insn will be replaced with
  r5 = <patched immediate>
for field relocation purpose.

With -mattr=+alu32, the input code may become
  r5 = ld_imm64 @"b:0:0$0:0"
  w2 = ldw32 r5, 0
  ... w2 ... // use w2
Replacing "w2" with "r5" is incorrect and will
trigger compiler internal errors.

To fix the problem, if the register class of ldw* dest
register is sub_32, we just replace the original ldw*
register with:
  w2 = w5
Directly replacing all uses of w2 with in-place
constructed w5 for the use operand seems not working in all cases.

The latest kernel will have -mattr=+alu32 on by default,
so added this flag to all CORE tests.
Tested with latest kernel bpf-next branch as well with this patch.

Differential Revision: https://reviews.llvm.org/D69438
 		2019-10-25 14:27:25 -07:00
..
AsmParser [llvm] Migrate llvm::make_unique to std::make_unique 2019-08-15 15:54:37 +00:00
Disassembler Revert CMake: Make most target symbols hidden by default 2019-06-11 03:21:13 +00:00
MCTargetDesc [Mips] Use appropriate private label prefix based on Mips ABI 2019-10-23 12:24:35 +02:00
TargetInfo Revert CMake: Make most target symbols hidden by default 2019-06-11 03:21:13 +00:00
BPF.h bpf: fix wrong truncation elimination when there is back-edge/loop 2019-10-16 15:27:59 +00:00
BPF.td [BPF] add code-gen support for JMP32 instructions 2019-02-07 10:43:09 +00:00
BPFAbstractMemberAccess.cpp [BPF] Remove relocation for patchable externs 2019-10-10 15:33:09 +00:00
BPFAsmPrinter.cpp Second attempt to add iterator_range::empty() 2019-10-07 18:14:24 +00:00
BPFCORE.h [BPF] Remove relocation for patchable externs 2019-10-10 15:33:09 +00:00
BPFCallingConv.td Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
BPFFrameLowering.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
BPFFrameLowering.h [Alignment][NFC] Use Align for TargetFrameLowering/Subtarget 2019-10-17 07:49:39 +00:00
BPFISelDAGToDAG.cpp bpf: fix wrong truncation elimination when there is back-edge/loop 2019-10-16 15:27:59 +00:00
BPFISelLowering.cpp [Alignment][NFC] Remove unneeded llvm:: scoping on Align types 2019-09-27 12:54:21 +00:00
BPFISelLowering.h [TargetLowering] Change getOptimalMemOpType to take a function attribute list 2019-04-30 08:38:12 +00:00
BPFInstrFormats.td [BPF] add code-gen support for JMP32 instructions 2019-02-07 10:43:09 +00:00
BPFInstrInfo.cpp Apply llvm-prefer-register-over-unsigned from clang-tidy to LLVM 2019-08-15 19:22:08 +00:00
BPFInstrInfo.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
BPFInstrInfo.td [BPF] fix indirect call assembly code 2019-10-21 03:22:03 +00:00
BPFMCInstLower.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
BPFMCInstLower.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
BPFMIChecking.cpp Prune a LegacyDivergenceAnalysis and MachineLoopInfo include each 2019-10-19 01:31:09 +00:00
BPFMIPeephole.cpp Prune a LegacyDivergenceAnalysis and MachineLoopInfo include each 2019-10-19 01:31:09 +00:00
BPFMISimplifyPatchable.cpp [BPF] fix a CO-RE issue with -mattr=+alu32 2019-10-25 14:27:25 -07:00
BPFRegisterInfo.cpp Apply llvm-prefer-register-over-unsigned from clang-tidy to LLVM 2019-08-15 19:22:08 +00:00
BPFRegisterInfo.h CodeGen: Introduce a class for registers 2019-06-24 15:50:29 +00:00
BPFRegisterInfo.td Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
BPFSelectionDAGInfo.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
BPFSelectionDAGInfo.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
BPFSubtarget.cpp [BPF] add code-gen support for JMP32 instructions 2019-02-07 10:43:09 +00:00
BPFSubtarget.h [BPF] add code-gen support for JMP32 instructions 2019-02-07 10:43:09 +00:00
BPFTargetMachine.cpp bpf: fix wrong truncation elimination when there is back-edge/loop 2019-10-16 15:27:59 +00:00
BPFTargetMachine.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
BTF.def [BPF] Add BTF Var and DataSec Support 2019-03-16 15:36:31 +00:00
BTF.h [BPF] Remove relocation for patchable externs 2019-10-10 15:33:09 +00:00
BTFDebug.cpp [BPF] Remove relocation for patchable externs 2019-10-10 15:33:09 +00:00
BTFDebug.h [BPF] Remove relocation for patchable externs 2019-10-10 15:33:09 +00:00
CMakeLists.txt [BPF] Fix a typo in the file name 2019-07-09 18:35:46 +00:00
LLVMBuild.txt [BPF] Move InstPrinter files to MCTargetDesc. NFC 2019-05-11 01:13:21 +00:00