Date: Fri, 7 Oct 2022 15:26:55 GMT From: Ed Maste <emaste@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 68ff187a2530 - stable/12 - Add ELFCOMPRESS_ZSTD ELF compression constant Message-ID: <202210071526.297FQtVL049139@gitrepo.freebsd.org>
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The branch stable/12 has been updated by emaste: URL: https://cgit.FreeBSD.org/src/commit/?id=68ff187a25306514b36e0b17314603e050ea301b commit 68ff187a25306514b36e0b17314603e050ea301b Author: Ed Maste <emaste@FreeBSD.org> AuthorDate: 2022-06-28 13:06:12 +0000 Commit: Ed Maste <emaste@FreeBSD.org> CommitDate: 2022-10-07 15:24:36 +0000 Add ELFCOMPRESS_ZSTD ELF compression constant ELFCOMPRESS_ZSTD indicates that an ELF section is compressed with zstd. It is the second compression type, after the existing ELFCOMPRESS_ZLIB. Zstd generally provides a compelling tradeoff of speed and compression (other algorithms may compress slightly better but take a lot longer, or run faster but do not compress nearly as well). See https://groups.google.com/g/generic-abi/c/satyPkuMisk for details. ELFCOMPRESS_ZSTD will be supported in a future Clang/LLVM update. ELF Tool Chain tools also need updating. Reviewed by: Fangrui Song MFC after: 1 week Sponsored by: The FreeBSD Foundation (cherry picked from commit 05b6744c446c2d274738fbb27a3ded1bf9f9f1d1) --- share/man/man5/elf.5 | 6 +++++- sys/sys/elf_common.h | 1 + 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/share/man/man5/elf.5 b/share/man/man5/elf.5 index f7abefa9a5d0..df051adbf873 100644 --- a/share/man/man5/elf.5 +++ b/share/man/man5/elf.5 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd March 11, 2020 +.Dd July 25, 2022 .Dt ELF 5 .Os .Sh NAME @@ -1069,6 +1069,10 @@ be registered. This section holds information used for C++ exception-handling. .El .Pp +A value of +.Dv ELFCOMPRESS_ZSTD +indicates that the data is compressed using +Zstandard. String table sections hold null-terminated character sequences, commonly called strings. The object file uses these strings to represent symbol diff --git a/sys/sys/elf_common.h b/sys/sys/elf_common.h index ed5352ba53a2..d77fc31720a4 100644 --- a/sys/sys/elf_common.h +++ b/sys/sys/elf_common.h @@ -923,6 +923,7 @@ typedef struct { /* Values for ch_type (compressed section headers). */ #define ELFCOMPRESS_ZLIB 1 /* ZLIB/DEFLATE */ +#define ELFCOMPRESS_ZSTD 2 /* Zstandard */ #define ELFCOMPRESS_LOOS 0x60000000 /* OS-specific */ #define ELFCOMPRESS_HIOS 0x6fffffff #define ELFCOMPRESS_LOPROC 0x70000000 /* Processor-specific */
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