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| author | Russ Cox <rsc@golang.org> | 2020-06-04 16:20:39 -0400 |
|---|---|---|
| committer | Austin Clements <austin@google.com> | 2020-06-05 16:54:48 +0000 |
| commit | b6faed1326b0f6c1efd33b99a4550cbc437bd72f (patch) | |
| tree | 1961818ec85d6cc22e59a8fd2783b492c2583992 | |
| parent | 76f233fe045788e71b7460ea82947e4bda6d76ff (diff) | |
| download | go-b6faed1326b0f6c1efd33b99a4550cbc437bd72f.tar.gz go-b6faed1326b0f6c1efd33b99a4550cbc437bd72f.zip | |
cmd/asm, cmd/compile, doc: document -spectre flags
Most of the docs are in the new wiki page
https://golang.org/wiki/Spectre.
Updates #37419.
Change-Id: I6e8f76670593c089de895e1665b41d874f879df9
Reviewed-on: https://go-review.googlesource.com/c/go/+/236599
Reviewed-by: Austin Clements <austin@google.com>
| -rw-r--r-- | doc/go1.15.html | 8 | ||||
| -rw-r--r-- | src/cmd/asm/doc.go | 7 | ||||
| -rw-r--r-- | src/cmd/compile/doc.go | 2 |
3 files changed, 13 insertions, 4 deletions
diff --git a/doc/go1.15.html b/doc/go1.15.html index 7a1924227c..d17888732b 100644 --- a/doc/go1.15.html +++ b/doc/go1.15.html @@ -246,7 +246,11 @@ TODO </p> <p><!-- CL 222661 --> - TODO: -spectre flags + Go 1.15 adds a <code>-spectre</code> flag to both the + compiler and the assembler, to allow enabling Spectre mitigations. + These should almost never be needed and are provided mainly as a + “defense in depth” mechanism. + See the <a href="https://github.com/golang/go/wiki/Spectre">Spectre wiki page</a> for details. </p> <h2 id="linker">Linker</h2> @@ -276,7 +280,7 @@ TODO These changes are part of a multi-release project to <a href="https://golang.org/s/better-linker">modernize the Go linker</a>, meaning that there will be additional linker - improvements expected in future releases. + improvements expected in future releases. </p> <h2 id="library">Core library</h2> diff --git a/src/cmd/asm/doc.go b/src/cmd/asm/doc.go index 8bf0acac25..4a0c785aad 100644 --- a/src/cmd/asm/doc.go +++ b/src/cmd/asm/doc.go @@ -33,14 +33,17 @@ Flags: Dump instructions as they are parsed. -dynlink Support references to Go symbols defined in other shared libraries. + -gensymabis + Write symbol ABI information to output file. Don't assemble. -o file Write output to file. The default is foo.o for /a/b/c/foo.s. -shared Generate code that can be linked into a shared library. + -spectre list + Enable spectre mitigations in list (all, ret). -trimpath prefix Remove prefix from recorded source file paths. - -gensymabis - Write symbol ABI information to output file. Don't assemble. + Input language: The assembler uses mostly the same syntax for all architectures, diff --git a/src/cmd/compile/doc.go b/src/cmd/compile/doc.go index 36dd4bb5cd..46d4722086 100644 --- a/src/cmd/compile/doc.go +++ b/src/cmd/compile/doc.go @@ -107,6 +107,8 @@ Flags: Warn about composite literals that can be simplified. -shared Generate code that can be linked into a shared library. + -spectre list + Enable spectre mitigations in list (all, index, ret). -traceprofile file Write an execution trace to file. -trimpath prefix |