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-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 {