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* Move all sources from the llvm project into contrib/llvm-project.Dimitry Andric2019-12-20132-80633/+0
| | | | | | | | | | | | | This uses the new layout of the upstream repository, which was recently migrated to GitHub, and converted into a "monorepo". That is, most of the earlier separate sub-projects with their own branches and tags were consolidated into one top-level directory, and are now branched and tagged together. Updating the vendor area to match this layout is next. Notes: svn path=/head/; revision=355940
* Merge commit bf996f761 from llvm git (by Simon Atanasyan):Dimitry Andric2019-11-211-1/+3
| | | | | | | | | | | | | | | | | | [mips] Write `AFL_EXT_OCTEONP` flag to the `.MIPS.abiflags` section Differential Revision: https://reviews.llvm.org/D69851 This is one of the upstream changes needed for adding support for the OCTEON+ CPU type, so that we can test Clang builds using the most commonly available FreeBSD/mips64 reference platform, the Edge Router Lite. Requested by: kevans MFC after: 1 month X-MFC-With: r353358 Notes: svn path=/head/; revision=354981
* Merge commit 3718102d4 from llvm git (by Simon Atanasyan):Dimitry Andric2019-11-211-2/+3
| | | | | | | | | | | | | | | | | | [mips] Support `octeon+` CPU in the `.set arch=` directive Differential Revision: https://reviews.llvm.org/D69850 This is one of the upstream changes needed for adding support for the OCTEON+ CPU type, so that we can test Clang builds using the most commonly available FreeBSD/mips64 reference platform, the Edge Router Lite. Requested by: kevans MFC after: 1 month X-MFC-With: r353358 Notes: svn path=/head/; revision=354980
* Merge commit 7bed381ea from llvm git (by Simon Atanasyan):Dimitry Andric2019-11-219-6/+119
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | [mips] Implement Octeon+ `saa` and `saad` instructions `saa` and `saad` are 32-bit and 64-bit store atomic add instructions. memory[base] = memory[base] + rt These instructions are available for "Octeon+" CPU. The patch adds support for both instructions to MIPS assembler and diassembler and introduces new CPU type - "octeon+". Next patches will implement `.set arch=octeon+` directive and `AFL_EXT_OCTEONP` ISA extension flag support. Differential Revision: https://reviews.llvm.org/D69849 This is one of the upstream changes needed for adding support for the OCTEON+ CPU type, so that we can test Clang builds using the most commonly available FreeBSD/mips64 reference platform, the Edge Router Lite. Requested by: kevans MFC after: 1 month X-MFC-With: r353358 Notes: svn path=/head/; revision=354979
* Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb, and openmpDimitry Andric2019-09-021-1/+18
| | | | | | | release_90 branch r370514, and update version numbers. Notes: svn path=/projects/clang900-import/; revision=351722
* Merge llvm trunk r366426, resolve conflicts, and update FREEBSD-Xlist.Dimitry Andric2019-08-21129-1427/+3584
| | | | Notes: svn path=/projects/clang900-import/; revision=351344
* Upgrade our copies of clang, llvm, lld, lldb, compiler-rt, libc++,Dimitry Andric2019-06-128-16/+46
| | | | | | | | | | | libunwind and openmp to the upstream release_80 branch r363030 (effectively, 8.0.1 rc2). The 8.0.1 release should follow this within a week or so. MFC after: 2 weeks Notes: svn path=/head/; revision=349004
* Merge llvm, clang, compiler-rt, libc++, lld, and lldb release_80 branchDimitry Andric2019-02-0515-19/+158
| | | | | | | r353167, resolve conflicts, and bump version numbers. Notes: svn path=/projects/clang800-import/; revision=343806
* Reduce diff against upstream.Dimitry Andric2019-01-221-1/+0
| | | | Notes: svn path=/projects/clang800-import/; revision=343321
* Merge llvm trunk r351319, resolve conflicts, and update FREEBSD-Xlist.Dimitry Andric2019-01-2057-505/+1416
| | | | Notes: svn path=/projects/clang800-import/; revision=343210
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ release_70 branchDimitry Andric2018-12-0912-14/+84
| | | | | | | | | | r348686 (effectively 7.0.1 rc3), resolve conflicts, and bump version numbers. PR: 230240, 230355 Notes: svn path=/projects/clang700-import/; revision=341763
* Merge llvm trunk r338150 (just before the 7.0.0 branch point), andDimitry Andric2018-08-0212-18/+53
| | | | | | | resolve conflicts. Notes: svn path=/projects/clang700-import/; revision=337149
* Merge llvm trunk r338150, and resolve conflicts.Dimitry Andric2018-07-3099-3508/+7171
| | | | Notes: svn path=/projects/clang700-import/; revision=336916
* Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ toDimitry Andric2018-06-2918-49/+293
| | | | | | | | | | 6.0.1 release (upstream r335540). Relnotes: yes MFC after: 2 weeks Notes: svn path=/head/; revision=335799
* Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ toDimitry Andric2018-02-022-3/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 6.0.0 (branches/release_60 r324090). This introduces retpoline support, with the -mretpoline flag. The upstream initial commit message (r323155 by Chandler Carruth) contains quite a bit of explanation. Quoting: Introduce the "retpoline" x86 mitigation technique for variant #2 of the speculative execution vulnerabilities disclosed today, specifically identified by CVE-2017-5715, "Branch Target Injection", and is one of the two halves to Spectre. Summary: First, we need to explain the core of the vulnerability. Note that this is a very incomplete description, please see the Project Zero blog post for details: https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-with-side.html The basis for branch target injection is to direct speculative execution of the processor to some "gadget" of executable code by poisoning the prediction of indirect branches with the address of that gadget. The gadget in turn contains an operation that provides a side channel for reading data. Most commonly, this will look like a load of secret data followed by a branch on the loaded value and then a load of some predictable cache line. The attacker then uses timing of the processors cache to determine which direction the branch took *in the speculative execution*, and in turn what one bit of the loaded value was. Due to the nature of these timing side channels and the branch predictor on Intel processors, this allows an attacker to leak data only accessible to a privileged domain (like the kernel) back into an unprivileged domain. The goal is simple: avoid generating code which contains an indirect branch that could have its prediction poisoned by an attacker. In many cases, the compiler can simply use directed conditional branches and a small search tree. LLVM already has support for lowering switches in this way and the first step of this patch is to disable jump-table lowering of switches and introduce a pass to rewrite explicit indirectbr sequences into a switch over integers. However, there is no fully general alternative to indirect calls. We introduce a new construct we call a "retpoline" to implement indirect calls in a non-speculatable way. It can be thought of loosely as a trampoline for indirect calls which uses the RET instruction on x86. Further, we arrange for a specific call->ret sequence which ensures the processor predicts the return to go to a controlled, known location. The retpoline then "smashes" the return address pushed onto the stack by the call with the desired target of the original indirect call. The result is a predicted return to the next instruction after a call (which can be used to trap speculative execution within an infinite loop) and an actual indirect branch to an arbitrary address. On 64-bit x86 ABIs, this is especially easily done in the compiler by using a guaranteed scratch register to pass the target into this device. For 32-bit ABIs there isn't a guaranteed scratch register and so several different retpoline variants are introduced to use a scratch register if one is available in the calling convention and to otherwise use direct stack push/pop sequences to pass the target address. This "retpoline" mitigation is fully described in the following blog post: https://support.google.com/faqs/answer/7625886 We also support a target feature that disables emission of the retpoline thunk by the compiler to allow for custom thunks if users want them. These are particularly useful in environments like kernels that routinely do hot-patching on boot and want to hot-patch their thunk to different code sequences. They can write this custom thunk and use `-mretpoline-external-thunk` *in addition* to `-mretpoline`. In this case, on x86-64 thu thunk names must be: ``` __llvm_external_retpoline_r11 ``` or on 32-bit: ``` __llvm_external_retpoline_eax __llvm_external_retpoline_ecx __llvm_external_retpoline_edx __llvm_external_retpoline_push ``` And the target of the retpoline is passed in the named register, or in the case of the `push` suffix on the top of the stack via a `pushl` instruction. There is one other important source of indirect branches in x86 ELF binaries: the PLT. These patches also include support for LLD to generate PLT entries that perform a retpoline-style indirection. The only other indirect branches remaining that we are aware of are from precompiled runtimes (such as crt0.o and similar). The ones we have found are not really attackable, and so we have not focused on them here, but eventually these runtimes should also be replicated for retpoline-ed configurations for completeness. For kernels or other freestanding or fully static executables, the compiler switch `-mretpoline` is sufficient to fully mitigate this particular attack. For dynamic executables, you must compile *all* libraries with `-mretpoline` and additionally link the dynamic executable and all shared libraries with LLD and pass `-z retpolineplt` (or use similar functionality from some other linker). We strongly recommend also using `-z now` as non-lazy binding allows the retpoline-mitigated PLT to be substantially smaller. When manually apply similar transformations to `-mretpoline` to the Linux kernel we observed very small performance hits to applications running typic al workloads, and relatively minor hits (approximately 2%) even for extremely syscall-heavy applications. This is largely due to the small number of indirect branches that occur in performance sensitive paths of the kernel. When using these patches on statically linked applications, especially C++ applications, you should expect to see a much more dramatic performance hit. For microbenchmarks that are switch, indirect-, or virtual-call heavy we have seen overheads ranging from 10% to 50%. However, real-world workloads exhibit substantially lower performance impact. Notably, techniques such as PGO and ThinLTO dramatically reduce the impact of hot indirect calls (by speculatively promoting them to direct calls) and allow optimized search trees to be used to lower switches. If you need to deploy these techniques in C++ applications, we *strongly* recommend that you ensure all hot call targets are statically linked (avoiding PLT indirection) and use both PGO and ThinLTO. Well tuned servers using all of these techniques saw 5% - 10% overhead from the use of retpoline. We will add detailed documentation covering these components in subsequent patches, but wanted to make the core functionality available as soon as possible. Happy for more code review, but we'd really like to get these patches landed and backported ASAP for obvious reasons. We're planning to backport this to both 6.0 and 5.0 release streams and get a 5.0 release with just this cherry picked ASAP for distros and vendors. This patch is the work of a number of people over the past month: Eric, Reid, Rui, and myself. I'm mailing it out as a single commit due to the time sensitive nature of landing this and the need to backport it. Huge thanks to everyone who helped out here, and everyone at Intel who helped out in discussions about how to craft this. Also, credit goes to Paul Turner (at Google, but not an LLVM contributor) for much of the underlying retpoline design. Reviewers: echristo, rnk, ruiu, craig.topper, DavidKreitzer Subscribers: sanjoy, emaste, mcrosier, mgorny, mehdi_amini, hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D41723 MFC after: 3 months X-MFC-With: r327952 PR: 224669 Notes: svn path=/head/; revision=328817
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ release_60 r321788,Dimitry Andric2018-01-063-8/+13
| | | | | | | update build glue and version numbers. Notes: svn path=/projects/clang600-import/; revision=327657
* Merge llvm trunk r321414 to contrib/llvm.Dimitry Andric2017-12-244-14/+13
| | | | Notes: svn path=/projects/clang600-import/; revision=327134
* Merge llvm trunk r321017 to contrib/llvm.Dimitry Andric2017-12-2078-2152/+2231
| | | | Notes: svn path=/projects/clang600-import/; revision=327023
* Upgrade our copies of clang, llvm, lldb and libc++ to r319231 from theDimitry Andric2017-12-0313-33/+426
| | | | | | | | | upstream release_50 branch. This corresponds to 5.0.1 rc2. MFC after: 2 weeks Notes: svn path=/head/; revision=326496
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r308421, and updateDimitry Andric2017-07-1913-602/+238
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=321238
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r307894, and updateDimitry Andric2017-07-1315-7/+683
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=320970
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r306956, and updateDimitry Andric2017-07-028-193/+334
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=320572
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r306325, and updateDimitry Andric2017-06-277-21/+57
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=320397
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r305575, and updateDimitry Andric2017-06-177-239/+197
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=320041
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r305145, and updateDimitry Andric2017-06-1032-63/+262
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=319799
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r304659, and updateDimitry Andric2017-06-031-0/+57
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=319547
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r304460, and updateDimitry Andric2017-06-013-10/+22
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=319479
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r304222, and updateDimitry Andric2017-05-304-40/+398
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=319250
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r304149, and updateDimitry Andric2017-05-293-27/+21
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=319164
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r303571, and updateDimitry Andric2017-05-229-72/+124
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=318681
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r303291, and updateDimitry Andric2017-05-181-1/+1
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=318477
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r303197, and updateDimitry Andric2017-05-164-6/+6
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=318384
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r302418, and updateDimitry Andric2017-05-081-34/+1
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=317969
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r302069, and updateDimitry Andric2017-05-039-22/+364
| | | | | | | build glue (preliminary, not all option combinations work yet). Notes: svn path=/projects/clang500-import/; revision=317778
* Merge llvm, clang, lld, lldb, compiler-rt and libc++ r301441, and updateDimitry Andric2017-04-2611-59/+200
| | | | | | | build glue. Notes: svn path=/projects/clang500-import/; revision=317472
* Merge llvm, clang, lld and lldb trunk r300890, and update build glue.Dimitry Andric2017-04-203-7/+94
| | | | Notes: svn path=/projects/clang500-import/; revision=317230
* Merge llvm trunk r300422 and resolve conflicts.Dimitry Andric2017-04-1650-873/+2300
| | | | Notes: svn path=/projects/clang500-import/; revision=317029
* Merge llvm, clang, compiler-rt, libc++, lld and lldb release_40 branchDimitry Andric2017-02-0111-44/+341
| | | | | | | r293807, and update build glue. Notes: svn path=/projects/clang400-import/; revision=313067
* Merge llvm, clang, lld and lldb release_40 branch r292009. Also updateDimitry Andric2017-01-141-19/+143
| | | | | | | build glue. Notes: svn path=/projects/clang400-import/; revision=312197
* Merge llvm, clang, lld and lldb trunk r291012, and resolve conflicts.Dimitry Andric2017-01-042-0/+8
| | | | Notes: svn path=/projects/clang400-import/; revision=311327
* Update llvm to trunk r290819 and resolve conflicts.Dimitry Andric2017-01-0268-1467/+4771
| | | | Notes: svn path=/projects/clang400-import/; revision=311142
* Pull in r280350 from upstream llvm trunk (by Hal Finkel):Dimitry Andric2016-09-102-20/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add ISD::EH_DWARF_CFA, simplify @llvm.eh.dwarf.cfa on Mips, fix on PowerPC LLVM has an @llvm.eh.dwarf.cfa intrinsic, used to lower the GCC-compatible __builtin_dwarf_cfa() builtin. As pointed out in PR26761, this is currently broken on PowerPC (and likely on ARM as well). Currently, @llvm.eh.dwarf.cfa is lowered using: ADD(FRAMEADDR, FRAME_TO_ARGS_OFFSET) where FRAME_TO_ARGS_OFFSET defaults to the constant zero. On x86, FRAME_TO_ARGS_OFFSET is lowered to 2*SlotSize. This setup, however, does not work for PowerPC. Because of the way that the stack layout works, the canonical frame address is not exactly (FRAMEADDR + FRAME_TO_ARGS_OFFSET) on PowerPC (there is a lower save-area offset as well), so it is not just a matter of implementing FRAME_TO_ARGS_OFFSET for PowerPC (unless we redefine its semantics -- We can do that, since it is currently used only for @llvm.eh.dwarf.cfa lowering, but the better to directly lower the CFA construct itself (since it can be easily represented as a fixed-offset FrameIndex)). Mips currently does this, but by using a custom lowering for ADD that specifically recognizes the (FRAMEADDR, FRAME_TO_ARGS_OFFSET) pattern. This change introduces a ISD::EH_DWARF_CFA node, which by default expands using the existing logic, but can be directly lowered by the target. Mips is updated to use this method (which simplifies its implementation, and I suspect makes it more robust), and updates PowerPC to do the same. Fixes PR26761. Differential Revision: https://reviews.llvm.org/D24038 Notes: svn path=/projects/clang390-import/; revision=305683
* Update llvm to release_39 branch r278877.Dimitry Andric2016-08-173-7/+17
| | | | Notes: svn path=/projects/clang390-import/; revision=304310
* Update llvm to release_39 branch r276489, and resolve conflicts.Dimitry Andric2016-08-1695-3949/+8170
| | | | Notes: svn path=/projects/clang390-import/; revision=304240
* Update llvm, clang and lldb to trunk r257626, and update build glue.Dimitry Andric2016-01-144-23/+6
| | | | Notes: svn path=/projects/clang380-import/; revision=294024
* Update llvm to trunk r256633.Dimitry Andric2015-12-3074-1867/+7404
| | | | Notes: svn path=/projects/clang380-import/; revision=292941
* Upgrade our copies of clang and llvm to 3.7.1 release. This is aDimitry Andric2015-12-252-0/+13
| | | | | | | | | | bugfix-only release, with no new features. Please note that from 3.5.0 onwards, clang and llvm require C++11 support to build; see UPDATING for more information. Notes: svn path=/head/; revision=292735
* Update llvm, clang and lldb to 3.7.0 release.Dimitry Andric2015-09-063-21/+32
| | | | Notes: svn path=/projects/clang370-import/; revision=287521
* Update llvm/clang to r242221.Dimitry Andric2015-08-1219-245/+212
| | | | Notes: svn path=/projects/clang-trunk/; revision=286684
* Update llvm/clang to r241361.Dimitry Andric2015-07-0553-159/+662
| | | | Notes: svn path=/projects/clang-trunk/; revision=285181
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