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2026-03-25debug/elf: handle program header count overflowIan Lance Taylor
ELF files only have a 16-bit count for program headers. To handle the very rare case of larger files, a large program header count is stored as 0xffff and the first section header info field holds the actual count. Fixes #78217 Change-Id: I35c7e15025a9677473cb43d09a41f17f75443731 Reviewed-on: https://go-review.googlesource.com/c/go/+/758040 Reviewed-by: David Chase <drchase@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Ian Lance Taylor <iant@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
2026-01-22debug/elf: return FormatError when reading short filesMark F
NewFile returns the raw error from ReadAt when failing to read the ELF identifier, typically io.EOF for empty or short files. This breaks the API contract that all parsing failures should return *FormatError. Wrap the error in FormatError for consistency with other error paths. Fixes #76338 Change-Id: Ic4ed77316fcc459ce8cbe9e9506d7cf8e9286623 Reviewed-on: https://go-review.googlesource.com/c/go/+/736600 Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Carlos Amedee <carlos@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Ian Lance Taylor <iant@golang.org> Auto-Submit: Ian Lance Taylor <iant@golang.org>
2025-10-17all: remove unnecessary loop variable copies in testsTobias Klauser
Copying the loop variable is no longer necessary since Go 1.22. Change-Id: Iebb21dac44a20ec200567f1d786f105a4ee4999d Reviewed-on: https://go-review.googlesource.com/c/go/+/711640 Reviewed-by: Florian Lehner <lehner.florian86@gmail.com> Auto-Submit: Damien Neil <dneil@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Damien Neil <dneil@google.com> Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2025-03-14debug/elf: add riscv attributes definitionsMeng Zhuo
This CL adds `riscv.attributes` related ELF section header type and program header type according to [RISC-V ELF Specification](https://github.com/riscv-non-isa/riscv-elf-psabi-doc/releases/download/v1.0/riscv-abi.pdf) Also an riscv64/linux testcase binary built from: ``` gcc -march=rv64g -no-pie -o gcc-riscv64-linux-exec hello.c strip gcc-riscv64-linux-exec ``` Fixes #72843 Change-Id: I7710a0516f69141c0efaba71dd997f05b4c88421 Reviewed-on: https://go-review.googlesource.com/c/go/+/657515 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com> Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
2024-12-17debug/elf: adjust version API per issue discussionIan Lance Taylor
This updates the new version API for the discussion on #63952. Note that the current tests do not have symbols with hidden versions. Leaving that for later. For #63952 Change-Id: I1ad4b1e485429a216ba8e5b68f7f4299d120628f Reviewed-on: https://go-review.googlesource.com/c/go/+/637235 Reviewed-by: Ian Lance Taylor <iant@google.com> Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Austin Clements <austin@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Commit-Queue: Ian Lance Taylor <iant@google.com>
2024-12-11debug/elf: adjust version API per issue discussionIan Lance Taylor
This updates the new version API for the discussion on #63952. This change reveals that in fact none of the tests set the VERSYM_HIDDEN bit. The code before this CL set the hidden flag for symbols that appear in DynamicVersionNeed, but that is not an accurate representation of the ELF. The readelf program does print undefined symbols that way (with a single '@'), but that doesn't mean that the hidden flag is set. Leaving tests with the hidden bit set for later. For #63952 Change-Id: Ida60831e0c9922dfc10f10c7a64bc76a2b197537 Reviewed-on: https://go-review.googlesource.com/c/go/+/635079 Reviewed-by: Austin Clements <austin@google.com> Commit-Queue: Ian Lance Taylor <iant@google.com> Auto-Submit: Ian Lance Taylor <iant@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
2024-11-07debug/elf: add SHT_GNU_VERDEF section parsingbenbaker76
Fixes #63952 Change-Id: Icf93e57e62243d9c3306d4e1c5dadb3f62747710 GitHub-Last-Rev: 5c2952760063474f3aac338fe5bdb65bde238ab6 GitHub-Pull-Request: golang/go#69850 Reviewed-on: https://go-review.googlesource.com/c/go/+/619077 Reviewed-by: Ian Lance Taylor <iant@google.com> Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: David Chase <drchase@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2023-09-22all: clean unnecessary casts for test filesJes Cok
This is a follow up of CL 528696. Change-Id: I5b71eabedb12567c4b1b36f7182a3d2b0ed662a5 GitHub-Last-Rev: acaf3ac11c38042ad27b99e1c70a3c9f1a554a15 GitHub-Pull-Request: golang/go#62713 Reviewed-on: https://go-review.googlesource.com/c/go/+/529197 Reviewed-by: Ian Lance Taylor <iant@google.com> Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2023-07-31debug/elf: don't use reflection in File.SymbolsTolya Korniltsev
cpu: AMD Ryzen 9 5950X 16-Core Processor | old.txt | new.txt | | sec/op | sec/op vs base | Symbols64-32 18.486µ ± 2% 4.509µ ± 24% -75.61% (p=0.000 n=10) Symbols32-32 17.823µ ± 3% 4.798µ ± 2% -73.08% (p=0.000 n=10) geomean 18.15µ 4.651µ -74.38% | old.txt | new.txt | | B/op | B/op vs base | Symbols64-32 10.680Ki ± 0% 8.922Ki ± 0% -16.46% (p=0.000 n=10) Symbols32-32 9.773Ki ± 0% 8.570Ki ± 0% -12.31% (p=0.000 n=10) geomean 10.22Ki 8.744Ki -14.41% | old.txt | new.txt | | allocs/op | allocs/op vs base | Symbols64-32 119.00 ± 0% 45.00 ± 0% -62.18% (p=0.000 n=10) Symbols32-32 125.00 ± 0% 50.00 ± 0% -60.00% (p=0.000 n=10) geomean 122.0 47.43 -61.11% Fixes #61534 Change-Id: I13a96467108771df31f018853df754e42100e773 Reviewed-on: https://go-review.googlesource.com/c/go/+/512395 TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> Run-TryBot: Ian Lance Taylor <iant@google.com> Reviewed-by: David Chase <drchase@google.com> Auto-Submit: Ian Lance Taylor <iant@google.com>
2023-04-11all: add wasip1 supportJohan Brandhorst-Satzkorn
Fixes #58141 Co-authored-by: Richard Musiol <neelance@gmail.com> Co-authored-by: Achille Roussel <achille.roussel@gmail.com> Co-authored-by: Julien Fabre <ju.pryz@gmail.com> Co-authored-by: Evan Phoenix <evan@phx.io> Change-Id: I49b66946acc90fdf09ed9223096bfec9a1e5b923 Reviewed-on: https://go-review.googlesource.com/c/go/+/479627 Run-TryBot: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com> Reviewed-by: Cherry Mui <cherryyz@google.com> Auto-Submit: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com> Auto-Submit: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> TryBot-Bypass: Ian Lance Taylor <iant@golang.org>
2023-04-11debug/elf: avoid decompress of section twiceMeng Zhuo
In rare cases, elf will get a corrupted section starts with 0x1, which happens to be COMPRESS_ZLIB that causing decompress twice. This CL drops sectionData decompress data after open section. Fixes #59208 Change-Id: I7999a55868b3b3481509e1ac35985f7580f0f688 Reviewed-on: https://go-review.googlesource.com/c/go/+/480895 Run-TryBot: Ian Lance Taylor <iant@google.com> Reviewed-by: Benny Siegert <bsiegert@gmail.com> TryBot-Result: Gopher Robot <gobot@golang.org> Auto-Submit: Ian Lance Taylor <iant@google.com> Run-TryBot: M Zhuo <mzh@golangcn.org> Reviewed-by: Ian Lance Taylor <iant@google.com>
2023-03-07debug/elf: retrieve values for dynamic section tagsFlorin Papa
Add functionality to retrieve values for .dynamic entries that don't correspond to entries in the string table. Fixes #56892 Change-Id: I6edabc8ca331c819e442d06e19b7f4df8343372b Reviewed-on: https://go-review.googlesource.com/c/go/+/452617 Auto-Submit: Ian Lance Taylor <iant@google.com> Run-TryBot: Ian Lance Taylor <iant@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
2022-09-27debug/elf: return error on reading from SHT_NOBITS sectionsZeke Lu
An SHT_NOBITS section contains no bytes and occupies no space in the file. This change makes it return an error on reading from this section so that it will force the caller to check for an SHT_NNOBITS section. We have considered another option to return "nil, nil" for the Data method. It's abandoned because it might lead a program to simply do the wrong thing, thinking that the section is empty. Please note that it breaks programs which expect a byte slice with the length described by the sh_size field. There are two reasons to introduce this breaking change: 1. SHT_NOBITS means no data and it's unnecessary to allocate memory for it; 2. it could result in an OOM if the file is corrupted and has a huge sh_size. Fixes #54967. Change-Id: I0c3ed4e097214fe88413d726a89122105ad45d4f GitHub-Last-Rev: 994c12d9da8c7029ce1d26eb1eb4d333ef3b1f97 GitHub-Pull-Request: golang/go#54994 Reviewed-on: https://go-review.googlesource.com/c/go/+/429601 Run-TryBot: Ian Lance Taylor <iant@golang.org> Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
2022-09-27debug/elf: suport files with >= 65280 (0xff00) sectionsZeke Lu
The spec https://refspecs.linuxfoundation.org/elf/gabi4+/ch4.eheader.html states: 1. e_shnum: If the number of sections is greater than or equal to SHN_LORESERVE (0xff00), this member has the value zero and the actual number of section header table entries is contained in the sh_size field of the section header at index 0. 2. e_shstrndx: If the section name string table section index is greater than or equal to SHN_LORESERVE (0xff00), this member has the value SHN_XINDEX (0xffff) and the actual index of the section name string table section is contained in the sh_link field of the section header at index 0. This CL makes these changes to support files with >= 0xff00 sections: 1. if shoff > 0 && shnum == 0, read sh_size from the initial section header entry as shnum. 2. if shstrndx == SHN_XINDEX, read sh_link from the initial section header entry as shstrndx. It returns an error if the type of the initial section is not SHT_NULL. A file with >= 0xff00 sections is too big to include in the repository, so the test case constructs one on the fly, with some of the sections zeroed out. While here, remove the unnecessary use of reflect.DeepEqual in the test. Fixes #55294. Change-Id: I15ec43612c7cce6e8decfe4e81da3a5b16de47f7 GitHub-Last-Rev: 797c16480bc76524ff1a7c01ed09b759fcd7d45b GitHub-Pull-Request: golang/go#55295 Reviewed-on: https://go-review.googlesource.com/c/go/+/432255 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> Auto-Submit: Ian Lance Taylor <iant@google.com> Run-TryBot: Ian Lance Taylor <iant@google.com>
2022-04-01debug/elf: ajdust SectionOverlap test for proper fieldsMeng Zhuo
The current SectionOverlap tests Size (addr) with Offset (file) This CL set this test for overlap of Size + Addr and Offset + FileSize Fixes #51939 Change-Id: Ied4c0b87f61c4d5e52139a8295c371f55abc776f Reviewed-on: https://go-review.googlesource.com/c/go/+/395920 Trust: mzh <mzh@golangcn.org> Trust: Than McIntosh <thanm@google.com> Run-TryBot: mzh <mzh@golangcn.org> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com>
2020-09-23all: add GOOS=iosCherry Zhang
Introduce GOOS=ios for iOS systems. GOOS=ios matches "darwin" build tag, like GOOS=android matches "linux" and GOOS=illumos matches "solaris". Only ios/arm64 is supported (ios/amd64 is not). GOOS=ios and GOOS=darwin remain essentially the same at this point. They will diverge at later time, to differentiate macOS and iOS. Uses of GOOS=="darwin" are changed to (GOOS=="darwin" || GOOS=="ios"), except if it clearly means macOS (e.g. GOOS=="darwin" && GOARCH=="amd64"), it remains GOOS=="darwin". Updates #38485. Change-Id: I4faacdc1008f42434599efb3c3ad90763a83b67c Reviewed-on: https://go-review.googlesource.com/c/go/+/254740 Trust: Cherry Zhang <cherryyz@google.com> Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>
2020-08-31debug/elf: support relocations relative to sections with non-zero addressesVictor Michel
commit 72ec930fa70c20ce69b21bf32a7916c04c2e9c2f added basic support for relocations, but assumed that the symbol value would be 0, likely because .debug_info always has address == 0 in the ELF section headers. CL 195679 added further support for relocations, but explicitly encoded the original assumption that section addresses would be 0. This change removes that assumption: all relocations will now be properly computed based on the target symbol value even when that symbol is a section with a non-zero address. Typically, sections that are part of a LOAD program segment have non-zero addresses. For example, .debug_ranges relocations could be relative to .text, which usually has an address > 0. Fixes #40879 Change-Id: Ib0a616bb8b05d6c96d179b03ca33a10946fc5d59 GitHub-Last-Rev: 4200de732641995f3a4958a13a5c78f65b7eae50 GitHub-Pull-Request: golang/go#41038 Reviewed-on: https://go-review.googlesource.com/c/go/+/250559 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2020-08-30debug/elf: run relocation tests in parallelIan Lance Taylor
Also don't restart DWARF reading from beginning when we are testing multiple entries. Also reformat relocationTests slice to use indexed literals. Change-Id: Ia5f17214483394d0ef033be516df61f0bdc521b6 Reviewed-on: https://go-review.googlesource.com/c/go/+/251637 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
2019-11-15all: fix a bunch of misspellingsVille Skyttä
Change-Id: I5b909df0fd048cd66c5a27fca1b06466d3bcaac7 GitHub-Last-Rev: 778c5d21311abee09a5fbda2e4005a5fd4cc3f9f GitHub-Pull-Request: golang/go#35624 Reviewed-on: https://go-review.googlesource.com/c/go/+/207421 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2019-10-09all: remove the nacl port (part 1)Brad Fitzpatrick
You were a useful port and you've served your purpose. Thanks for all the play. A subsequent CL will remove amd64p32 (including assembly files and toolchain bits) and remaining bits. The amd64p32 removal will be separated into its own CL in case we want to support the Linux x32 ABI in the future and want our old amd64p32 support as a starting point. Updates #30439 Change-Id: Ia3a0c7d49804adc87bf52a4dea7e3d3007f2b1cd Reviewed-on: https://go-review.googlesource.com/c/go/+/199499 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
2019-03-01debug/elf: perform stricter section header table checks in NewFileTobias Klauser
If an ELF file has no section header table (shoff = 0), shnum must be zero as well according to elf(5). So far, when only shnum was zero but shoff was non-zero (i.e. in an invalid ELF file) shstrndx wasn't properly checked and could result in an 'index out of range' later on. Fixes #10996 Change-Id: Ic248d2d77099b0036458e2a844b086a5f463c844 Reviewed-on: https://go-review.googlesource.com/c/162857 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-11-02all: skip unsupported tests on AIXClément Chigot
This commit skips tests which aren't yet supported on AIX. nosplit.go is disabled because stackGuardMultiplier is increased for syscalls. Change-Id: Ib5ff9a4539c7646bcb6caee159f105ff8a160ad7 Reviewed-on: https://go-review.googlesource.com/c/146939 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
2018-04-30all: skip unsupported tests for js/wasmRichard Musiol
The general policy for the current state of js/wasm is that it only has to support tests that are also supported by nacl. The test nilptr3.go makes assumptions about which nil checks can be removed. Since WebAssembly does not signal on reading a null pointer, all nil checks have to be explicit. Updates #18892 Change-Id: I06a687860b8d22ae26b1c391499c0f5183e4c485 Reviewed-on: https://go-review.googlesource.com/110096 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-04-18debug/elf: add riscv64 relocationsTobias Klauser
Based on the code from https://github.com/riscv/riscv-go/ originally written by Amol Bhave. Change-Id: I8d5377096d4ff8b198dadb630511f9a0347f9797 Reviewed-on: https://go-review.googlesource.com/107339 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2018-04-17debug/elf: enable TestNoSectionOverlaps on *bsd and solarisTobias Klauser
cmd/link produces ELF executables on all these geese, so enable TestNoSectionOverlaps for them as well. Also add a skip message. Change-Id: I374651dde3679271ef8c0c375c9cabd1adbca310 Reviewed-on: https://go-review.googlesource.com/107535 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2016-11-03debug/elf: add support for GOARCH=mips{,le}Vladimir Stefanovic
Change-Id: Ia6f8ae7e56a49ad66b60a24c4afb606f3cfe5efd Reviewed-on: https://go-review.googlesource.com/31482 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
2016-10-11debug/elf: add sparc64 relocationsJames Clarke
Change-Id: I1a2504ad9ca8607588d2d366598115fe360435b5 Reviewed-on: https://go-review.googlesource.com/30870 Reviewed-by: Ian Lance Taylor <iant@golang.org>
2016-05-06all: use SeekStart, SeekCurrent, SeekEndJoe Tsai
CL/19862 (f79b50b8d5bc159561c1dcf7c17e2a0db96a9a11) recently introduced the constants SeekStart, SeekCurrent, and SeekEnd to the io package. We should use these constants consistently throughout the code base. Updates #15269 Change-Id: If7fcaca7676e4a51f588528f5ced28220d9639a2 Reviewed-on: https://go-review.googlesource.com/22097 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Joe Tsai <joetsai@digital-static.net> TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-03-30debug/elf: deflake file_test.goJoe Tsai
It is valid for io.Reader to return (n, io.EOF) where n is positive. The unit test should not fail if io.EOF is returned when read until the end. Change-Id: I7b918e3cc03db8b90c8aa58f4c0f7806a1d4af7e Reviewed-on: https://go-review.googlesource.com/21307 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-03-29debug/elf: add s390x relocationsMichael Munday
Change-Id: I8440f69c7f99d65b2f69035c26b4a62104f22bd3 Reviewed-on: https://go-review.googlesource.com/20874 Reviewed-by: Minux Ma <minux@golang.org>
2016-03-01all: make copyright headers consistent with one space after periodBrad Fitzpatrick
This is a subset of https://golang.org/cl/20022 with only the copyright header lines, so the next CL will be smaller and more reviewable. Go policy has been single space after periods in comments for some time. The copyright header template at: https://golang.org/doc/contribute.html#copyright also uses a single space. Make them all consistent. Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0 Reviewed-on: https://go-review.googlesource.com/20111 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-12-03debug/elf: transparently decompress compressed sectionsAustin Clements
This adds support for compressed ELF sections. This compression is treated as a framing issue and hence the package APIs all transparently decompress compressed sections. This requires some subtlety for (*Section).Open, which returns an io.ReadSeeker: since the decompressed data comes from an io.Reader, this commit introduces a Reader-to-ReadSeeker adapter that is efficient for common uses of Seek and does what it can otherwise. Fixes #11773. Change-Id: Ic0cb7255a85cadf4c1d15fb563d5a2e89dbd3c36 Reviewed-on: https://go-review.googlesource.com/17341 Reviewed-by: Russ Cox <rsc@golang.org> Run-TryBot: Austin Clements <austin@google.com>
2015-12-03dwbug/elf: support old-style compressed DWARFAustin Clements
GCC and LLVM support zlib-compressing DWARF debug sections (and there's some evidence that this may be happening by default in some circumstances now). Add support for reading compressed DWARF sections. Since ELF relocations apply to the decompressed data, decompression is done before applying relocations. Since relcations are applied by debug/elf, decompression must also be handled there. Note that this is different from compressed ELF sections, which is a more general mechanism used by very recent versions of GCC. Updates #11773. Change-Id: I3f4bf1b04d0802cc1e8fcb7c2a5fcf6c467c5089 Reviewed-on: https://go-review.googlesource.com/17340 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Russ Cox <rsc@golang.org>
2015-11-12debug/elf: added MIPS ELF relocationsYao Zhang
Change-Id: I05352749a852095baae2f67fd71ffcf5f727538d Reviewed-on: https://go-review.googlesource.com/14453 Reviewed-by: Minux Ma <minux@golang.org>
2015-08-25debug/elf: map/slice literals janitoringDidier Spezia
Simplify slice/map literal expressions. Caught with gofmt -d -s, fixed with gofmt -w -s Reformatted some expressions to improve readability. Change-Id: Iaf123e6bd49162ec45c59297ad3b002ca59443bc Reviewed-on: https://go-review.googlesource.com/13850 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-06-26debug/elf: change R_ARM_REL32 to R_ARM_ABS32 in applyRelocationsARMIan Lance Taylor
The original version of applyRelocationsARM was added in http://golang.org/cl/7266. It was added to fix the ARM build, which had been broken by http://golang.org/cl/6780. Before CL 6780, there was no relocation processing for ARM. CL 6780 changed the code to require relocation processing for every supported target. CL 7266 fixed the ARM build by adding a relocation processing function, but in fact no actual processing was done. The code only looked for REL32 relocations, but ARM debug info has no such relocations. The test case added in CL 7266 doesn't have any either. This didn't matter because no relocation processing was required on ARM, at least not for GCC-generated debug info. GCC generates ABS32 relocations, but only against section symbols which have the value 0. Therefore, the addition done by correct handling of ABS32 doesn't change anything. Clang, however, generates ABS32 relocations against local symbols, some of which have non-zero values. For those, we need to handle ABS32 relocations. This patch corrects the CL 7266 to look for ABS32 relocations instead of REL32 relocations. The code was already written to correctly handle ABS32 relocations, it just mistakenly said REL32. This is the ARM equivalent of https://golang.org/cl/96680045, which fixed the same problem in the same way for clang on 386. With this patch, clang-3.5 can be used to build Go on ARM GNU/Linux. Fixes #8980. Change-Id: I0c2d72eadfe6373bde99cd03eee40de6a582dda1 Reviewed-on: https://go-review.googlesource.com/11222 Reviewed-by: Russ Cox <rsc@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org>
2015-04-12debug/dwarf: add DWARF attribute value class to FieldAustin Clements
To return DWARF attribute values, debug/dwarf maps the DWARF attribute value classes to Go types. Unfortunately, this mapping is ambiguous in a way that makes it impossible to correctly interpret some DWARF attributes as of DWARF 4. For example, AttrStartScope can be either a constant or a rangelistptr. The attribute is interpreted differently depending on its class, but debug/dwarf maps both classes to int64, so the caller can't distinguish them from the Go type. AttrDataMemberLocation is similar. To address this, this change adds a field to type Field that indicates the exact DWARF attribute value class of that field's value. This makes it possible to distinguish value classes that can't be distinguished by their Go type alone. The root of this type ambiguity was DWARF itself. For example, DWARF 2 made no distinction between constants that were just constants and constants that were section offsets because no attribute could have both meanings. Hence, the single int64 type was sufficient. To avoid introducing just another layer of ambiguity, this change takes pains to canonicalize ambiguous classes in DWARF 2 and 3 files into the unambiguous classes of DWARF 4. Of course, there's no guarantee that future DWARF versions won't do the same thing again and further subdivide the DWARF 4 classes. This change gets ahead of this somewhat by distinguishing the various *ptr classes even though the encoding does not. If there's some other form of split, we can handle this in a backwards-compatible way by introducing, for example, a Class5 field and type. Change-Id: I4ef96d1223b0fd7f96ecf44fcc0e704a36af02b4 Reviewed-on: https://go-review.googlesource.com/8502 Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-03-14debug/elf: support reading debug info from 32-bit PPC objectsIan Lance Taylor
Fixes #10118. Change-Id: I4a2e6748db609c6eed1d68c824b81c59bd7b875c Reviewed-on: https://go-review.googlesource.com/7590 Reviewed-by: Minux Ma <minux@golang.org>
2015-03-11debug/elf: fix arm buildDave Cheney
This change adds the minimum necessary to implement applyRelocations. For adg, this code uses the switch statement. Change-Id: I0989daab8d0e36c2a4f6a315ced258b832744616 Reviewed-on: https://go-review.googlesource.com/7266 Reviewed-by: Ian Lance Taylor <iant@golang.org>
2014-10-22build: merge the great pkg/ rename into dev.power64Austin Clements
This also removes pkg/runtime/traceback_lr.c, which was ported to Go in an earlier commit and then moved to runtime/traceback.go. Reviewer: rsc@golang.org rsc: LGTM
2014-09-08build: move package sources from src/pkg to srcRuss Cox
Preparation was in CL 134570043. This CL contains only the effect of 'hg mv src/pkg/* src'. For more about the move, see golang.org/s/go14nopkg.
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