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authorIan Lance Taylor <ian@gcc.gnu.org>2019-01-22 00:06:44 +0000
committerIan Lance Taylor <ian@gcc.gnu.org>2019-01-22 00:06:44 +0000
commit3d338229dc6fa2092a17c0e175ddfb3514c085f4 (patch)
tree96dcda6cedb3e21eac2ce461a7b129b86f83feef /libgo/go/internal/cpu
parentea31c98daba7d3459dc5500049876fe0a71a89d3 (diff)
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re PR go/88927 (Bootstrap failure on arm in libgo starting with r268084)
PR go/88927 runtime, internal/cpu: fix build for ARM GNU/Linux Was failing with ../../../libgo/go/internal/cpu/cpu.go:138:2: error: reference to undefined name 'doinit' 138 | doinit() | ^ Fix it by adding in Go 1.12 internal/cpu/cpu_arm.go, and the code in runtime that initializes the values. Fixes https://gcc.gnu.org/PR88927. Reviewed-on: https://go-review.googlesource.com/c/158717 From-SVN: r268131
Diffstat (limited to 'libgo/go/internal/cpu')
-rw-r--r--libgo/go/internal/cpu/cpu_arm.go33
1 files changed, 33 insertions, 0 deletions
diff --git a/libgo/go/internal/cpu/cpu_arm.go b/libgo/go/internal/cpu/cpu_arm.go
new file mode 100644
index 0000000..a1d5a7b
--- /dev/null
+++ b/libgo/go/internal/cpu/cpu_arm.go
@@ -0,0 +1,33 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package cpu
+
+// arm doesn't have a 'cpuid' equivalent, so we rely on HWCAP/HWCAP2.
+// These are linknamed in runtime/os_(linux|freebsd)_arm.go and are
+// initialized by archauxv().
+// These should not be changed after they are initialized.
+var HWCap uint
+var HWCap2 uint
+
+// HWCAP/HWCAP2 bits. These are exposed by Linux and FreeBSD.
+const (
+ hwcap_VFPv4 = 1 << 16
+ hwcap_IDIVA = 1 << 17
+)
+
+func doinit() {
+ options = []option{
+ {Name: "vfpv4", Feature: &ARM.HasVFPv4},
+ {Name: "idiva", Feature: &ARM.HasIDIVA},
+ }
+
+ // HWCAP feature bits
+ ARM.HasVFPv4 = isSet(HWCap, hwcap_VFPv4)
+ ARM.HasIDIVA = isSet(HWCap, hwcap_IDIVA)
+}
+
+func isSet(hwc uint, value uint) bool {
+ return hwc&value != 0
+}