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James Clarke da7b129b1b [RISCV] Don't force Local Exec TLS for non-PIC 
Summary:
Forcing Local Exec TLS requires the use of copy relocations. Copy
relocations need special handling in the runtime linker when being used
against TLS symbols, which is present in glibc, but not in FreeBSD nor
musl, and so cannot be relied upon. Moreover, copy relocations are a
hack that embed the size of an object in the ABI when it otherwise
wouldn't be, and break protected symbols (which are expected to be DSO
local), whilst also wasting space, thus they should be avoided whenever
possible. As discussed in D70398, RISC-V should move away from forcing
Local Exec, and instead use Initial Exec like other targets, with
possible linker relaxation to follow. The RISC-V GCC maintainers also
intend to adopt this more-conventional behaviour (see
https://github.com/riscv/riscv-elf-psabi-doc/issues/122).

Reviewers: asb, MaskRay

Reviewed By: MaskRay

Subscribers: emaste, krytarowski, hiraditya, rbar, johnrusso, simoncook, sabuasal, niosHD, kito-cheng, shiva0217, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, rkruppe, PkmX, jocewei, psnobl, benna, Jim, lenary, s.egerton, pzheng, sameer.abuasal, apazos, llvm-commits, bsdjhb

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70649
 		2019-12-03 22:04:54 +00:00
..
AsmParser [cmake] Explicitly mark libraries defined in lib/ as "Component Libraries" 2019-11-21 10:48:08 -08:00
Disassembler [cmake] Explicitly mark libraries defined in lib/ as "Component Libraries" 2019-11-21 10:48:08 -08:00
MCTargetDesc [cmake] Explicitly mark libraries defined in lib/ as "Component Libraries" 2019-11-21 10:48:08 -08:00
TargetInfo [cmake] Explicitly mark libraries defined in lib/ as "Component Libraries" 2019-11-21 10:48:08 -08:00
Utils [cmake] Explicitly mark libraries defined in lib/ as "Component Libraries" 2019-11-21 10:48:08 -08:00
CMakeLists.txt [RISCV GlobalISel] Adding initial GlobalISel infrastructure 2019-08-20 22:53:24 +00:00
LLVMBuild.txt [RISCV GlobalISel] Adding initial GlobalISel infrastructure 2019-08-20 22:53:24 +00:00
RISCV.h [RISCV GlobalISel] Adding initial GlobalISel infrastructure 2019-08-20 22:53:24 +00:00
RISCV.td [RISCV] Add support for -ffixed-xX flags 2019-10-22 21:25:01 +01:00
RISCVAsmPrinter.cpp [RISCV] Support z and i operand modifiers 2019-07-08 05:00:26 +00:00
RISCVCallLowering.cpp [RISCV GlobalISel] Adding initial GlobalISel infrastructure 2019-08-20 22:53:24 +00:00
RISCVCallLowering.h [RISCV GlobalISel] Adding initial GlobalISel infrastructure 2019-08-20 22:53:24 +00:00
RISCVCallingConv.td [RISCV] Rename FPRs and use Register arithmetic 2019-09-27 15:49:10 +00:00
RISCVExpandPseudoInsts.cpp [RISCV] Use addi rather than add x0 2019-11-14 18:43:38 +00:00
RISCVFrameLowering.cpp [RISCV] Handle variable sized objects with the stack need to be realigned 2019-11-16 12:39:53 +08:00
RISCVFrameLowering.h [RISCV] Handle variable sized objects with the stack need to be realigned 2019-11-16 12:39:53 +08:00
RISCVISelDAGToDAG.cpp Fix uninitialized variable warning. NFCI. 2019-11-13 14:40:21 +00:00
RISCVISelLowering.cpp [RISCV] Don't force Local Exec TLS for non-PIC 2019-12-03 22:04:54 +00:00
RISCVISelLowering.h [RISCV] Implement the TargetLowering::getRegisterByName hook 2019-11-04 11:23:54 +00:00
RISCVInstrFormats.td [RISCV] Implement pseudo instructions for load/store from a symbol address. 2019-02-20 03:31:32 +00:00
RISCVInstrFormatsC.td Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
RISCVInstrInfo.cpp Use MCRegister in copyPhysReg 2019-11-11 14:42:33 +05:30
RISCVInstrInfo.h Use MCRegister in copyPhysReg 2019-11-11 14:42:33 +05:30
RISCVInstrInfo.td [RISCV] Lower llvm.trap and llvm.debugtrap 2019-10-28 09:54:33 +00:00
RISCVInstrInfoA.td Reapply r372285 "GlobalISel: Don't materialize immarg arguments to intrinsics" 2019-09-19 16:26:14 +00:00
RISCVInstrInfoC.td [RISCV] Added missing ImmLeaf predicates 2019-10-04 23:42:07 +00:00
RISCVInstrInfoD.td [RISCV] Handle fcopysign(f32, f64) and fcopysign(f64, f32) 2019-11-26 14:26:31 +00:00
RISCVInstrInfoF.td [RISCV] Add obsolete aliases of fscsr, frcsr (fssr, frsr) 2019-10-03 15:47:28 +00:00
RISCVInstrInfoM.td [RISCV] Custom-legalise i32 SDIV/UDIV/UREM on RV64M 2019-01-25 05:11:34 +00:00
RISCVInstructionSelector.cpp [RISCV GlobalISel] Adding initial GlobalISel infrastructure 2019-08-20 22:53:24 +00:00
RISCVLegalizerInfo.cpp [RISCV GlobalISel] Adding initial GlobalISel infrastructure 2019-08-20 22:53:24 +00:00
RISCVLegalizerInfo.h [RISCV GlobalISel] Adding initial GlobalISel infrastructure 2019-08-20 22:53:24 +00:00
RISCVMCInstLower.cpp [RISCV] Add lowering of global TLS addresses 2019-06-19 08:40:59 +00:00
RISCVMachineFunctionInfo.h [RISCV] Delete a ctor that is commented out. NFC 2019-07-05 08:25:14 +00:00
RISCVMergeBaseOffset.cpp [RISCV] Convert registers from unsigned to Register 2019-08-16 14:27:50 +00:00
RISCVRegisterBankInfo.cpp [RISCV GlobalISel] Adding initial GlobalISel infrastructure 2019-08-20 22:53:24 +00:00
RISCVRegisterBankInfo.h [RISCV GlobalISel] Adding initial GlobalISel infrastructure 2019-08-20 22:53:24 +00:00
RISCVRegisterBanks.td [RISCV GlobalISel] Adding initial GlobalISel infrastructure 2019-08-20 22:53:24 +00:00
RISCVRegisterInfo.cpp [RISCV] Handle variable sized objects with the stack need to be realigned 2019-11-16 12:39:53 +08:00
RISCVRegisterInfo.h [RISCV] Add support for -ffixed-xX flags 2019-10-22 21:25:01 +01:00
RISCVRegisterInfo.td [RISCV] Rename FPRs and use Register arithmetic 2019-09-27 15:49:10 +00:00
RISCVSubtarget.cpp [RISCV] Add support for -ffixed-xX flags 2019-10-22 21:25:01 +01:00
RISCVSubtarget.h [RISCV] Add support for -ffixed-xX flags 2019-10-22 21:25:01 +01:00
RISCVSystemOperands.td [RISCV][NFC] Replace hard-coded CSR duplication with symbolic references 2019-07-05 12:16:40 +00:00
RISCVTargetMachine.cpp Sink all InitializePasses.h includes 2019-11-13 16:34:37 -08:00
RISCVTargetMachine.h [RISCV] Add RISCV-specific TargetTransformInfo 2019-06-21 13:36:09 +00:00
RISCVTargetObjectFile.cpp [RISCV] Put data smaller than eight bytes to small data section 2019-04-11 04:59:13 +00:00
RISCVTargetObjectFile.h [RISCV] Put data smaller than eight bytes to small data section 2019-04-11 04:59:13 +00:00
RISCVTargetTransformInfo.cpp [RISCV] Fix RISCVTTIImpl::getIntImmCost for immediates where getMinSignedBits() > 64 2019-07-09 10:56:18 +00:00
RISCVTargetTransformInfo.h [RISCV] Add RISCV-specific TargetTransformInfo 2019-06-21 13:36:09 +00:00