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| author | Carlos Eduardo Seo <cseo@linux.vnet.ibm.com> | 2018-08-23 20:16:19 -0300 |
|---|---|---|
| committer | Lynn Boger <laboger@linux.vnet.ibm.com> | 2018-08-31 13:12:31 +0000 |
| commit | dbd8af74723d2c98cbdcc70f7e2801f69b57ac5b (patch) | |
| tree | cbd54a861f3f00ca36761be6043ec60a2ec47adf /src/runtime/vdso_linux.go | |
| parent | 8359b5e134052db0e5f1bc2257d496b0a81aa4fb (diff) | |
| download | go-dbd8af74723d2c98cbdcc70f7e2801f69b57ac5b.tar.gz go-dbd8af74723d2c98cbdcc70f7e2801f69b57ac5b.zip | |
runtime: add support for VDSO on ppc64x for use in walltime/nanotime
This change adds support for VDSO on ppc64x, making it possible to
avoid a syscall in walltime and nanotime.
BenchmarkClockVDSOAndFallbackPaths/vDSO-192 20000000 66.0 ns/op
BenchmarkClockVDSOAndFallbackPaths/Fallback-192 1000000 1456 ns/op
Change-Id: I3373bd804b6f122961de3ae9d034e6ccf35748e6
Reviewed-on: https://go-review.googlesource.com/131135
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Diffstat (limited to 'src/runtime/vdso_linux.go')
| -rw-r--r-- | src/runtime/vdso_linux.go | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/runtime/vdso_linux.go b/src/runtime/vdso_linux.go index f6a285efd7..9827874bea 100644 --- a/src/runtime/vdso_linux.go +++ b/src/runtime/vdso_linux.go @@ -3,7 +3,7 @@ // license that can be found in the LICENSE file. // +build linux -// +build 386 amd64 arm arm64 +// +build 386 amd64 arm arm64 ppc64 ppc64le package runtime @@ -42,6 +42,8 @@ const ( _STT_FUNC = 2 /* Symbol is a code object */ + _STT_NOTYPE = 0 /* Symbol type is not specified */ + _STB_GLOBAL = 1 /* Global symbol */ _STB_WEAK = 2 /* Weak symbol */ @@ -212,7 +214,8 @@ func vdsoParseSymbols(info *vdsoInfo, version int32) { sym := &info.symtab[symIndex] typ := _ELF_ST_TYPE(sym.st_info) bind := _ELF_ST_BIND(sym.st_info) - if typ != _STT_FUNC || bind != _STB_GLOBAL && bind != _STB_WEAK || sym.st_shndx == _SHN_UNDEF { + // On ppc64x, VDSO functions are of type _STT_NOTYPE. + if typ != _STT_FUNC && typ != _STT_NOTYPE || bind != _STB_GLOBAL && bind != _STB_WEAK || sym.st_shndx == _SHN_UNDEF { return false } if k.name != gostringnocopy(&info.symstrings[sym.st_name]) { |