Lazy-fpsimd support patch series#1: add Arm64-fpsimd support to arch module

This patch defines the structures and
adds the implementations for fpsimd initialization.

Signed-off-by: Bin Lu <bin.lu@arm.com>

1 files changed, 13 insertions, 3 deletions

diff --git a/pkg/sentry/arch/arch_arm64.go b/pkg/sentry/arch/arch_arm64.go
index 94f1a808f..372b650b9 100644
--- a/pkg/sentry/arch/arch_arm64.go
+++ b/pkg/sentry/arch/arch_arm64.go
@@ -68,6 +68,7 @@ const (
 // context64 represents an ARM64 context.
 type context64 struct {
 	State
+	sigFPState []aarch64FPState // fpstate to be restored on sigreturn.
 }
 
 // Arch implements Context.Arch.
@@ -75,10 +76,19 @@ func (c *context64) Arch() Arch {
 	return ARM64
 }
 
+func (c *context64) copySigFPState() []aarch64FPState {
+	var sigfps []aarch64FPState
+	for _, s := range c.sigFPState {
+		sigfps = append(sigfps, s.fork())
+	}
+	return sigfps
+}
+
 // Fork returns an exact copy of this context.
 func (c *context64) Fork() Context {
 	return &context64{
-		State: c.State.Fork(),
+		State:      c.State.Fork(),
+		sigFPState: c.copySigFPState(),
 	}
 }
 
@@ -137,8 +147,8 @@ func (c *context64) SetTLS(value uintptr) bool {
 	return false
 }
 
-// SetRSEQInterruptedIP implements Context.SetRSEQInterruptedIP.
-func (c *context64) SetRSEQInterruptedIP(value uintptr) {
+// SetOldRSeqInterruptedIP implements Context.SetOldRSeqInterruptedIP.
+func (c *context64) SetOldRSeqInterruptedIP(value uintptr) {
 	c.Regs.Regs[3] = uint64(value)
 }