Changes in basic.s

42a21778 - [test] Use host platform specific error message substitution in lit tests

Fri, 29 Jan 2021 12:15:50 +0000

[test] Use host platform specific error message substitution in lit testsOn z/OS, the following error message is not matched correctly in lit tests.```EDC5129I No such file or directory.```This patch uses a lit config substitution to check for platform specific error messages.Reviewed By: muiez, jhendersonDifferential Revision: https://reviews.llvm.org/D95246 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

978444d5 - Revert "[SystemZ][z/OS] Fix No such file or directory expression error"

Mon, 25 Jan 2021 13:02:41 +0000

Revert "[SystemZ][z/OS] Fix No such file or directory expression error"This reverts commit 06f8a49693957bc27b83e0ab5f429ff874941a07. List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

689aaba7 - [SystemZ][z/OS] Fix No such file or directory expression error matching in lit tests

Mon, 18 Jan 2021 12:14:12 +0000

[SystemZ][z/OS] Fix No such file or directory expression error matching in lit testsOn z/OS, the following error message is not matched correctly in lit tests. This patch updates the CHECK expression to match successfully.```EDC5129I No such file or directory.```Reviewed By: muiezDifferential Revision: https://reviews.llvm.org/D94239 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

34bdddf9 - [ELF][test] Split basic.s

Fri, 27 Mar 2020 18:35:02 +0000

[ELF][test] Split basic.s List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

09158252 - [ThinLTO] Allow usage of all hardware threads in the system

Fri, 27 Mar 2020 14:20:39 +0000

[ThinLTO] Allow usage of all hardware threads in the systemBefore this patch, it wasn't possible to extend the ThinLTO threads to all SMT/CMT threads in the system. Only one thread per core was allowed, instructed by usage of llvm::heavyweight_hardware_concurrency() in the ThinLTO code. Any number passed to the LLD flag /opt:lldltojobs=..., or any other ThinLTO-specific flag, was previously interpreted in the context of llvm::heavyweight_hardware_concurrency(), which means SMT disabled.One can now say in LLD:/opt:lldltojobs=0 -- Use one std::thread / hardware core in the system (no SMT). Default value if flag not specified./opt:lldltojobs=N -- Limit usage to N threads, regardless of usage of heavyweight_hardware_concurrency()./opt:lldltojobs=all -- Use all hardware threads in the system. Equivalent to /opt:lldltojobs=$(nproc) on Linux and /opt:lldltojobs=%NUMBER_OF_PROCESSORS% on Windows. When an affinity mask is set for the process, threads will be created only for the cores selected by the mask.When N > number-of-hardware-threads-in-the-system, the threads in the thread pool will be dispatched equally on all CPU sockets (tested only on Windows).When N <= number-of-hardware-threads-on-a-CPU-socket, the threads will remain on the CPU socket where the process started (only on Windows).Differential Revision: https://reviews.llvm.org/D75153 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

9e1319df - [llvm-readelf] Make --all output order closer to GNU readelf

Wed, 04 Mar 2020 03:49:14 +0000

[llvm-readelf] Make --all output order closer to GNU readelfhttps://bugs.llvm.org/show_bug.cgi?id=43403The new order makes it easy to compare the two tools' --all.Reviewed By: grimar, rupprechtDifferential Revision: https://reviews.llvm.org/D75592 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

81cebfd0 - [ELF][test] Change -o %t to -o /dev/null if the output is not needed

Thu, 13 Feb 2020 05:48:45 +0000

[ELF][test] Change -o %t to -o /dev/null if the output is not needed List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

d4306e90 - [ELF][X86] Allow PT_LOAD to have overlapping p_offset ranges on EM_X86_64

Mon, 16 Sep 2019 07:05:34 +0000

[ELF][X86] Allow PT_LOAD to have overlapping p_offset ranges on EM_X86_64Port the D64906 technique to EM_X86_64.Differential Revision: https://reviews.llvm.org/D67482llvm-svn: 371958 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

5391f158 - [ELF] Add -z separate-code and pad the last page of last PF_X PT_LOAD with traps only if -z separate-code is specified

Thu, 01 Aug 2019 09:58:25 +0000

[ELF] Add -z separate-code and pad the last page of last PF_X PT_LOAD with traps only if -z separate-code is specifiedThis patch1) adds -z separate-code and -z noseparate-code (default).2) changes the condition that the last page of last PF_X PT_LOAD is padded with trap instructions. Current condition (after D33630): if there is no `SECTIONS` commands. After this change: if -z separate-code is specified.-z separate-code was introduced to ld.bfd in 2018, to place the textsegment in its own pages. There is no overlap in pages between anexecutable segment and a non-executable segment:1) RX cannot load initial contents from R or RW(or non-SHF_ALLOC).2) R and RW(or non-SHF_ALLOC) cannot load initial contents from RX.lld's current status:- Between R and RX: in `Writer::fixSectionAlignments()`, the start of a segment is always aligned to maxPageSize, so the initial contents loaded by R and RX do not overlap. I plan to allow overlaps in D64906 if -z noseparate-code is in effect.- Between RX and RW(or non-SHF_ALLOC if RW doesn't exist): we currently unconditionally pad the last page to commonPageSize (defaults to 4096 on all targets we support). This patch will make it effective only if -z separate-code is specified.-z separate-code is a dubious feature that intends to reduce the numberof ROP gadgets (which is actually ineffective because attackers can findplenty of gadgets in the text segment, no need to find gadgets innon-code regions).With the overlapping PT_LOAD technique D64906, -z noseparate-coderemoves two more alignments at segment boundaries than -z separate-code.This saves at most defaultCommonPageSize*2 bytes, which are significanton targets with large defaultCommonPageSize (AArch64/MIPS/PPC: 65536).Issues/feedback on alignment at segment boundaries to help understandthe implication:* binutils PR24490 (the situation on ld.bfd is worse because they have two R-- on both sides of R-E so more alignments.)* In binutils, the 2018-02-27 commit "ld: Add --enable-separate-code" made -z separate-code the default on Linux. https://github.com/richfelker/musl-cross-make/commit/d969dea983a2cc54a1e0308a0cdeb6c3307e4bfa In musl-cross-make, binutils is configured with --disable-separate-code to address size regressions caused by -z separate-code. (lld actually has the same issue, which I plan to fix in a future patch. The ld.bfd x86 status is worse because they default to max-page-size=0x200000).* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237676 people want smaller code size. This patch will remove one alignment boundary.* Stef O'Rear: I'm opposed to any kind of page alignment at the text/rodata line (having a partial page of text aliased as rodata and vice versa has no demonstrable harm, and I actually care about small systems).So, make -z noseparate-code the default.Reviewed By: ruiuDifferential Revision: https://reviews.llvm.org/D64903llvm-svn: 367537 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

e041d15f - [LLD][ELF] Add the -z ifunc-noplt option

Tue, 14 May 2019 15:25:21 +0000

[LLD][ELF] Add the -z ifunc-noplt optionPatch by Mark Johnston!Summary:When the option is configured, ifunc calls do not go through the PLT;rather, they appear as regular function calls with relocationsreferencing the ifunc symbol, and the resolver is invoked whenapplying the relocation. This is intended for use in freestandingenvironments where text relocations are permissible and is incompatiblewith the -z text option. The option is motivated by ifunc usage in theFreeBSD kernel, where ifuncs are used to elide CPU feature flag bitchecks in hot paths. Instead of replacing the cost of a branch with thatof an indirect function call, the -z ifunc-noplt option is used to ensurethat ifunc calls carry no hidden overhead relative to normal functioncalls.Test Plan:I added a couple of regression tests and tested the FreeBSD kernelbuild using the latest lld sources.To demonstrate the effects of the change, I used a micro-benchmarkwhich results in frequent invocations of a FreeBSD kernel ifunc. Thebenchmark was run with and without IBRS enabled, and with and without-zifunc-noplt configured. The observed speedup is small and consistent,and is significantly larger with IBRS enabled:https://people.freebsd.org/~markj/ifunc-noplt/noibrs.txthttps://people.freebsd.org/~markj/ifunc-noplt/ibrs.txtReviewed By: ruiu, MaskRayDifferential Revision: https://reviews.llvm.org/D61613llvm-svn: 360685 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

54743d57 - Add typo correction for command-line flags to ELF and COFF lld drivers

Tue, 07 May 2019 13:48:30 +0000

Add typo correction for command-line flags to ELF and COFF lld driversFor lld-link, unknown '/'-style flags are treated as filenames on POSIXsystems, so only '-'-style flags get typo correction for now. Thismatches clang-cl.PR37006.Differential Revision: https://reviews.llvm.org/D61443llvm-svn: 360145 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

b159906a - [test] Change llvm-readobj -long-option to --long-option or well-known short options. NFC

Wed, 01 May 2019 05:49:01 +0000

[test] Change llvm-readobj -long-option to --long-option or well-known short options. NFCAlso change some options that have different semantics (cause confusion) in llvm-readelf mode:-s => -S-t => --symbols-sd => --section-datallvm-svn: 359651 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

a5d43d00 - Propagate sh_entsize out.

Wed, 15 Nov 2017 16:56:20 +0000

Propagate sh_entsize out.No difference in practice other than having sh_entsize in the output.This should simplify the patch for handling SHF_MERGE in -r.Based on a patch by George Rimar.llvm-svn: 318306 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

7ab9f7be - [ELF] Set p_memsz to p_filesz when aligning the last segment to page boundary

Fri, 01 Sep 2017 21:48:20 +0000

[ELF] Set p_memsz to p_filesz when aligning the last segment to page boundaryHaving p_filesz different from p_memsz is confusing some tools.Differential Revision: https://reviews.llvm.org/D37369llvm-svn: 312384 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

cb38bf52 - [ELF] - LTO: Try to be option compatible with the gold plugin.

Mon, 14 Aug 2017 10:17:30 +0000

[ELF] - LTO: Try to be option compatible with the gold plugin.This is relative to PR30720.Previously we ignored all --plugin-opt arguments.Patch adds support for them.Patch does not add any new LTO options,and just implements mapping from --plugin-opt to existent ones.Differential revision: https://reviews.llvm.org/D36227llvm-svn: 310826 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

edd6c358 - [ELF] When the code segment is the last, align it to the page boundary

Wed, 02 Aug 2017 16:35:00 +0000

[ELF] When the code segment is the last, align it to the page boundaryWhen the data segment is the last segment, it is correct to leaveit unaligned. However, when the code segment is the last segment,it should be aligned to the page boundary to avoid loading thenon-segment parts of the ELF file at the end of the file.Differential Revision: https://reviews.llvm.org/D33630llvm-svn: 309829 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

810ce10b - Change the error message format for duplicate symbols.

Fri, 31 Mar 2017 23:40:21 +0000

Change the error message format for duplicate symbols.This patch is intended to improve readability of "duplicate symbol"error messages.Without this patch: /ssd/clang/bin/ld.lld: error: /ssd/llvm-project/lld/ELF/Relocations.cpp:1054: duplicate symbol 'lld::elf::demangle(llvm::StringRef)' /ssd/clang/bin/ld.lld: error: /ssd/llvm-project/lld/ELF/Strings.cpp:93: previous definition was hereWith this patch: /ssd/clang/bin/ld.lld: error: duplicate symbol: lld::elf::demangle(llvm::StringRef) >>> defined at Strings.cpp:93 (/ssd/llvm-project/lld/ELF/Strings.cpp:93) >>> Strings.cpp.o:(lld::elf::demangle(llvm::StringRef)) in archive lib/liblldELF.a >>> defined at Relocations.cpp:1054 (/ssd/llvm-project/lld/ELF/Relocations.cpp:1054) >>> Relocations.cpp.o:(.text+0x4C30) in archive lib/liblldELF.aDiscussion thread:http://lists.llvm.org/pipermail/llvm-dev/2017-March/111459.htmlDifferential Revision: https://reviews.llvm.org/D31507llvm-svn: 299280 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

25324313 - Stop propagating Entsize.

Fri, 03 Feb 2017 21:29:51 +0000

Stop propagating Entsize.Now that we combine multiple synthetic merge section into one outputsection there is no point in trying to propagate a value.llvm-svn: 294048 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

817c9d66 - Support non-regular output files.

Mon, 09 Jan 2017 23:07:05 +0000

Support non-regular output files.This patch enables something like "-o /dev/null".Previouly, it failed because such files cannot be renamed.Differential Revision: https://reviews.llvm.org/D28010llvm-svn: 291496 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s

8fd0196c - lld: Default image base address to 0x200000 on x86-64

Wed, 23 Nov 2016 17:44:02 +0000

lld: Default image base address to 0x200000 on x86-64Align to the large page size (known as a superpage or huge page).FreeBSD automatically promotes large, superpage-aligned allocations.Differential Revision: https://reviews.llvm.org/D27042llvm-svn: 287782 List of files: /llvm-project-15.0.7/lld/test/ELF/basic.s