diff options
Diffstat (limited to 'pkg/sentry/arch/arch_aarch64.go')
| -rw-r--r-- | pkg/sentry/arch/arch_aarch64.go | 71 |
1 files changed, 9 insertions, 62 deletions
diff --git a/pkg/sentry/arch/arch_aarch64.go b/pkg/sentry/arch/arch_aarch64.go index fd73751e7..08789f517 100644 --- a/pkg/sentry/arch/arch_aarch64.go +++ b/pkg/sentry/arch/arch_aarch64.go @@ -23,6 +23,7 @@ import ( "gvisor.dev/gvisor/pkg/abi/linux" "gvisor.dev/gvisor/pkg/cpuid" "gvisor.dev/gvisor/pkg/log" + "gvisor.dev/gvisor/pkg/sentry/arch/fpu" rpb "gvisor.dev/gvisor/pkg/sentry/arch/registers_go_proto" "gvisor.dev/gvisor/pkg/syserror" ) @@ -40,65 +41,11 @@ type Registers struct { const ( // SyscallWidth is the width of insturctions. SyscallWidth = 4 - - // fpsimdMagic is the magic number which is used in fpsimd_context. - fpsimdMagic = 0x46508001 - - // fpsimdContextSize is the size of fpsimd_context. - fpsimdContextSize = 0x210 ) // ARMTrapFlag is the mask for the trap flag. const ARMTrapFlag = uint64(1) << 21 -// aarch64FPState is aarch64 floating point state. -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) { -} - -func newAarch64FPStateSlice() []byte { - return alignedBytes(4096, 16)[:fpsimdContextSize] -} - -// newAarch64FPState returns an initialized floating point state. -// -// The returned state is large enough to store all floating point state -// supported by host, even if the app won't use much of it due to a restricted -// FeatureSet. -func newAarch64FPState() aarch64FPState { - f := aarch64FPState(newAarch64FPStateSlice()) - initAarch64FPState(f) - return f -} - -// fork creates and returns an identical copy of the aarch64 floating point state. -func (f aarch64FPState) fork() aarch64FPState { - n := aarch64FPState(newAarch64FPStateSlice()) - copy(n, f) - return n -} - -// FloatingPointData returns the raw data pointer. -func (f aarch64FPState) FloatingPointData() *FloatingPointData { - return (*FloatingPointData)(&f[0]) -} - -// NewFloatingPointData returns a new floating point data blob. -// -// This is primarily for use in tests. -func NewFloatingPointData() *FloatingPointData { - return (*FloatingPointData)(&(newAarch64FPState()[0])) -} - // State contains the common architecture bits for aarch64 (the build tag of this // file ensures it's only built on aarch64). // @@ -108,7 +55,7 @@ type State struct { Regs Registers // Our floating point state. - aarch64FPState `state:"wait"` + fpState fpu.State `state:"wait"` // FeatureSet is a pointer to the currently active feature set. FeatureSet *cpuid.FeatureSet @@ -162,10 +109,10 @@ func (s State) Proto() *rpb.Registers { // Fork creates and returns an identical copy of the state. func (s *State) Fork() State { return State{ - Regs: s.Regs, - aarch64FPState: s.aarch64FPState.fork(), - FeatureSet: s.FeatureSet, - OrigR0: s.OrigR0, + Regs: s.Regs, + fpState: s.fpState.Fork(), + FeatureSet: s.FeatureSet, + OrigR0: s.OrigR0, } } @@ -318,10 +265,10 @@ func New(arch Arch, fs *cpuid.FeatureSet) Context { case ARM64: return &context64{ State{ - aarch64FPState: newAarch64FPState(), - FeatureSet: fs, + fpState: fpu.NewState(), + FeatureSet: fs, }, - []aarch64FPState(nil), + []fpu.State(nil), } } panic(fmt.Sprintf("unknown architecture %v", arch)) |