/* Generic definitions for dealing with Mach thread states.

   Copyright (C) 1994-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

/* Everything else is called `thread_state', but CMU's header file is

   called `thread_status'.  Oh boy.  */

#include <mach/thread_status.h>

/* The machine-dependent thread_state.h file can either define these

   macros, or just define PC and SP to the register names.  */

#ifndef MACHINE_THREAD_STATE_SET_PC

#define MACHINE_THREAD_STATE_SET_PC(ts, pc) \

  ((ts)->PC = (unsigned long int) (pc))

#endif

#ifndef MACHINE_THREAD_STATE_SET_SP

#ifdef STACK_GROWTH_UP

#define MACHINE_THREAD_STATE_SET_SP(ts, stack, size) \

  ((ts)->SP = (unsigned long int) (stack))

#else

#define MACHINE_THREAD_STATE_SET_SP(ts, stack, size) \

  ((ts)->SP = (unsigned long int) (stack) + (size))

#endif

#endif

/* This copies architecture-specific bits from the current thread to the new

   thread state.  */

#ifndef MACHINE_THREAD_STATE_FIX_NEW

# define MACHINE_THREAD_STATE_FIX_NEW(ts)

#endif

/* These functions are of use in machine-dependent signal trampoline

   implementations.  */

#include <string.h>		/* size_t, memcpy */

#include <mach/mach_interface.h> /* __thread_get_state */

static inline int

machine_get_state (thread_t thread, struct machine_thread_all_state *state,

		   int flavor, void *stateptr, void *scpptr, size_t size)

{

  if (state->set & (1 << flavor))

    {

      /* Copy the saved state.  */

      memcpy (scpptr, stateptr, size);

      return 1;

    }

  else

    {

      /* No one asked about this flavor of state before; fetch the state

	 directly from the kernel into the sigcontext.  */

      mach_msg_type_number_t got = (size / sizeof (int));

      return (! __thread_get_state (thread, flavor, scpptr, &got)

	      && got == (size / sizeof (int)));

    }

}

static inline int

machine_get_basic_state (thread_t thread,

			 struct machine_thread_all_state *state)

{

  mach_msg_type_number_t count;

  if (state->set & (1 << MACHINE_THREAD_STATE_FLAVOR))

    return 1;

  count = MACHINE_THREAD_STATE_COUNT;

  if (__thread_get_state (thread, MACHINE_THREAD_STATE_FLAVOR,

			  (natural_t *) &state->basic,

			  &count) != KERN_SUCCESS ||

      count != MACHINE_THREAD_STATE_COUNT)

    /* What kind of thread?? */

    return 0;			/* XXX */

  state->set |= 1 << MACHINE_THREAD_STATE_FLAVOR;

  return 1;

}