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authorgVisor bot <gvisor-bot@google.com>2020-06-09 18:05:01 -0700
committergVisor bot <gvisor-bot@google.com>2020-06-09 18:05:01 -0700
commit52c922f7c00c3cdb5ddf001ae453cc65881cde2c (patch)
treeaf3bfe1f12ee85fcf6f035c96477361cc54798f1 /pkg/sentry
parente3cbfbf34919d544bbf2da92044bb4044d673e21 (diff)
parent5ad1025d2dde4af9cad2e2d46e4b1c5a26f55409 (diff)
Merge pull request #2712 from lubinszARM:pr_sigfp_init
PiperOrigin-RevId: 315599736
Diffstat (limited to 'pkg/sentry')
-rw-r--r--pkg/sentry/arch/arch_aarch64.go10
1 files changed, 7 insertions, 3 deletions
diff --git a/pkg/sentry/arch/arch_aarch64.go b/pkg/sentry/arch/arch_aarch64.go
index 343f81f59..daba8b172 100644
--- a/pkg/sentry/arch/arch_aarch64.go
+++ b/pkg/sentry/arch/arch_aarch64.go
@@ -17,7 +17,6 @@
package arch
import (
- "encoding/binary"
"fmt"
"io"
@@ -49,9 +48,14 @@ const ARMTrapFlag = uint64(1) << 21
type aarch64FPState []byte
// initAarch64FPState sets up initial state.
+//
+// Related code in Linux kernel: fpsimd_flush_thread().
+// FPCR = FPCR_RM_RN (0x0 << 22).
+//
+// Currently, aarch64FPState is only a space of 0x210 length for fpstate.
+// The fp head is useless in sentry/ptrace/kvm.
+//
func initAarch64FPState(data aarch64FPState) {
- binary.LittleEndian.PutUint32(data, fpsimdMagic)
- binary.LittleEndian.PutUint32(data[4:], fpsimdContextSize)
}
func newAarch64FPStateSlice() []byte {