enable pkg/sentry/arch to support arm64 basically

Signed-off-by: Bin Lu <bin.lu@arm.com>
Change-Id: I9cce23db4e5caec82ce42b4970fdb7f7e8c08f1d
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/773 from lubinszARM:pr_arch_basic 3fe2fd8e6286766bbe489ef971dce204f924feba
PiperOrigin-RevId: 289795569

1 files changed, 0 insertions, 230 deletions

diff --git a/pkg/sentry/arch/signal_amd64.go b/pkg/sentry/arch/signal_amd64.go
index febd6f9b9..1e4f9c3c2 100644
--- a/pkg/sentry/arch/signal_amd64.go
+++ b/pkg/sentry/arch/signal_amd64.go
@@ -26,236 +26,6 @@ import (
 	"gvisor.dev/gvisor/pkg/sentry/usermem"
 )
 
-// SignalAct represents the action that should be taken when a signal is
-// delivered, and is equivalent to struct sigaction on 64-bit x86.
-//
-// +stateify savable
-type SignalAct struct {
-	Handler  uint64
-	Flags    uint64
-	Restorer uint64
-	Mask     linux.SignalSet
-}
-
-// SerializeFrom implements NativeSignalAct.SerializeFrom.
-func (s *SignalAct) SerializeFrom(other *SignalAct) {
-	*s = *other
-}
-
-// DeserializeTo implements NativeSignalAct.DeserializeTo.
-func (s *SignalAct) DeserializeTo(other *SignalAct) {
-	*other = *s
-}
-
-// SignalStack represents information about a user stack, and is equivalent to
-// stack_t on 64-bit x86.
-//
-// +stateify savable
-type SignalStack struct {
-	Addr  uint64
-	Flags uint32
-	_     uint32
-	Size  uint64
-}
-
-// SerializeFrom implements NativeSignalStack.SerializeFrom.
-func (s *SignalStack) SerializeFrom(other *SignalStack) {
-	*s = *other
-}
-
-// DeserializeTo implements NativeSignalStack.DeserializeTo.
-func (s *SignalStack) DeserializeTo(other *SignalStack) {
-	*other = *s
-}
-
-// SignalInfo represents information about a signal being delivered, and is
-// equivalent to struct siginfo on 64-bit x86.
-//
-// +stateify savable
-type SignalInfo struct {
-	Signo int32 // Signal number
-	Errno int32 // Errno value
-	Code  int32 // Signal code
-	_     uint32
-
-	// struct siginfo::_sifields is a union. In SignalInfo, fields in the union
-	// are accessed through methods.
-	//
-	// For reference, here is the definition of _sifields: (_sigfault._trapno,
-	// which does not exist on x86, omitted for clarity)
-	//
-	// union {
-	// 	int _pad[SI_PAD_SIZE];
-	//
-	// 	/* kill() */
-	// 	struct {
-	// 		__kernel_pid_t _pid;	/* sender's pid */
-	// 		__ARCH_SI_UID_T _uid;	/* sender's uid */
-	// 	} _kill;
-	//
-	// 	/* POSIX.1b timers */
-	// 	struct {
-	// 		__kernel_timer_t _tid;	/* timer id */
-	// 		int _overrun;		/* overrun count */
-	// 		char _pad[sizeof( __ARCH_SI_UID_T) - sizeof(int)];
-	// 		sigval_t _sigval;	/* same as below */
-	// 		int _sys_private;       /* not to be passed to user */
-	// 	} _timer;
-	//
-	// 	/* POSIX.1b signals */
-	// 	struct {
-	// 		__kernel_pid_t _pid;	/* sender's pid */
-	// 		__ARCH_SI_UID_T _uid;	/* sender's uid */
-	// 		sigval_t _sigval;
-	// 	} _rt;
-	//
-	// 	/* SIGCHLD */
-	// 	struct {
-	// 		__kernel_pid_t _pid;	/* which child */
-	// 		__ARCH_SI_UID_T _uid;	/* sender's uid */
-	// 		int _status;		/* exit code */
-	// 		__ARCH_SI_CLOCK_T _utime;
-	// 		__ARCH_SI_CLOCK_T _stime;
-	// 	} _sigchld;
-	//
-	// 	/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
-	// 	struct {
-	// 		void *_addr; /* faulting insn/memory ref. */
-	// 		short _addr_lsb; /* LSB of the reported address */
-	// 	} _sigfault;
-	//
-	// 	/* SIGPOLL */
-	// 	struct {
-	// 		__ARCH_SI_BAND_T _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
-	// 		int _fd;
-	// 	} _sigpoll;
-	//
-	// 	/* SIGSYS */
-	// 	struct {
-	// 		void *_call_addr; /* calling user insn */
-	// 		int _syscall;	/* triggering system call number */
-	// 		unsigned int _arch;	/* AUDIT_ARCH_* of syscall */
-	// 	} _sigsys;
-	// } _sifields;
-	//
-	// _sifields is padded so that the size of siginfo is SI_MAX_SIZE = 128
-	// bytes.
-	Fields [128 - 16]byte
-}
-
-// FixSignalCodeForUser fixes up si_code.
-//
-// The si_code we get from Linux may contain the kernel-specific code in the
-// top 16 bits if it's positive (e.g., from ptrace). Linux's
-// copy_siginfo_to_user does
-//     err |= __put_user((short)from->si_code, &to->si_code);
-// to mask out those bits and we need to do the same.
-func (s *SignalInfo) FixSignalCodeForUser() {
-	if s.Code > 0 {
-		s.Code &= 0x0000ffff
-	}
-}
-
-// Pid returns the si_pid field.
-func (s *SignalInfo) Pid() int32 {
-	return int32(usermem.ByteOrder.Uint32(s.Fields[0:4]))
-}
-
-// SetPid mutates the si_pid field.
-func (s *SignalInfo) SetPid(val int32) {
-	usermem.ByteOrder.PutUint32(s.Fields[0:4], uint32(val))
-}
-
-// Uid returns the si_uid field.
-func (s *SignalInfo) Uid() int32 {
-	return int32(usermem.ByteOrder.Uint32(s.Fields[4:8]))
-}
-
-// SetUid mutates the si_uid field.
-func (s *SignalInfo) SetUid(val int32) {
-	usermem.ByteOrder.PutUint32(s.Fields[4:8], uint32(val))
-}
-
-// Sigval returns the sigval field, which is aliased to both si_int and si_ptr.
-func (s *SignalInfo) Sigval() uint64 {
-	return usermem.ByteOrder.Uint64(s.Fields[8:16])
-}
-
-// SetSigval mutates the sigval field.
-func (s *SignalInfo) SetSigval(val uint64) {
-	usermem.ByteOrder.PutUint64(s.Fields[8:16], val)
-}
-
-// TimerID returns the si_timerid field.
-func (s *SignalInfo) TimerID() linux.TimerID {
-	return linux.TimerID(usermem.ByteOrder.Uint32(s.Fields[0:4]))
-}
-
-// SetTimerID sets the si_timerid field.
-func (s *SignalInfo) SetTimerID(val linux.TimerID) {
-	usermem.ByteOrder.PutUint32(s.Fields[0:4], uint32(val))
-}
-
-// Overrun returns the si_overrun field.
-func (s *SignalInfo) Overrun() int32 {
-	return int32(usermem.ByteOrder.Uint32(s.Fields[4:8]))
-}
-
-// SetOverrun sets the si_overrun field.
-func (s *SignalInfo) SetOverrun(val int32) {
-	usermem.ByteOrder.PutUint32(s.Fields[4:8], uint32(val))
-}
-
-// Addr returns the si_addr field.
-func (s *SignalInfo) Addr() uint64 {
-	return usermem.ByteOrder.Uint64(s.Fields[0:8])
-}
-
-// SetAddr sets the si_addr field.
-func (s *SignalInfo) SetAddr(val uint64) {
-	usermem.ByteOrder.PutUint64(s.Fields[0:8], val)
-}
-
-// Status returns the si_status field.
-func (s *SignalInfo) Status() int32 {
-	return int32(usermem.ByteOrder.Uint32(s.Fields[8:12]))
-}
-
-// SetStatus mutates the si_status field.
-func (s *SignalInfo) SetStatus(val int32) {
-	usermem.ByteOrder.PutUint32(s.Fields[8:12], uint32(val))
-}
-
-// CallAddr returns the si_call_addr field.
-func (s *SignalInfo) CallAddr() uint64 {
-	return usermem.ByteOrder.Uint64(s.Fields[0:8])
-}
-
-// SetCallAddr mutates the si_call_addr field.
-func (s *SignalInfo) SetCallAddr(val uint64) {
-	usermem.ByteOrder.PutUint64(s.Fields[0:8], val)
-}
-
-// Syscall returns the si_syscall field.
-func (s *SignalInfo) Syscall() int32 {
-	return int32(usermem.ByteOrder.Uint32(s.Fields[8:12]))
-}
-
-// SetSyscall mutates the si_syscall field.
-func (s *SignalInfo) SetSyscall(val int32) {
-	usermem.ByteOrder.PutUint32(s.Fields[8:12], uint32(val))
-}
-
-// Arch returns the si_arch field.
-func (s *SignalInfo) Arch() uint32 {
-	return usermem.ByteOrder.Uint32(s.Fields[12:16])
-}
-
-// SetArch mutates the si_arch field.
-func (s *SignalInfo) SetArch(val uint32) {
-	usermem.ByteOrder.PutUint32(s.Fields[12:16], val)
-}
-
 // SignalContext64 is equivalent to struct sigcontext, the type passed as the
 // second argument to signal handlers set by signal(2).
 type SignalContext64 struct {