sysdeps/mach/thread_state.h

   1 /* Generic definitions for dealing with Mach thread states.
   2    Copyright (C) 1994, 1996 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20
  21 /* Everything else is called `thread_state', but CMU's header file is
  22    called `thread_status'.  Oh boy.  */
  23 #include <mach/thread_status.h>
  24
  25 /* The machine-dependent thread_state.h file can either define these
  26    macros, or just define PC and SP to the register names.  */
  27
  28 #ifndef MACHINE_THREAD_STATE_SET_PC
  29 #define MACHINE_THREAD_STATE_SET_PC(ts, pc) \
  30   ((ts)->PC = (unsigned long int) (pc))
  31 #endif
  32 #ifndef MACHINE_THREAD_STATE_SET_SP
  33 #ifdef STACK_GROWTH_UP
  34 #define MACHINE_THREAD_STATE_SET_SP(ts, stack, size) \
  35   ((ts)->SP = (unsigned long int) (stack))
  36 #else
  37 #define MACHINE_THREAD_STATE_SET_SP(ts, stack, size) \
  38   ((ts)->SP = (unsigned long int) (stack) + (size))
  39 #endif
  40 #endif
  41
  42 /* These functions are of use in machine-dependent signal trampoline
  43    implementations.  */
  44
  45 #include <string.h>             /* size_t, memcpy */
  46 #include <mach/mach_interface.h> /* __thread_get_state */
  47
  48 static inline int
  49 machine_get_state (thread_t thread, struct machine_thread_all_state *state,
  50                    int flavor, void *stateptr, void *scpptr, size_t size)
  51 {
  52   if (state->set & (1 << flavor))
  53     {
  54       /* Copy the saved state.  */
  55       memcpy (scpptr, stateptr, size);
  56       return 1;
  57     }
  58   else
  59     {
  60       /* No one asked about this flavor of state before; fetch the state
  61          directly from the kernel into the sigcontext.  */
  62       mach_msg_type_number_t got = (size / sizeof (int));
  63       return (! __thread_get_state (thread, flavor, scpptr, &got)
  64               && got == (size / sizeof (int)));
  65     }
  66 }
  67
  68 static inline int
  69 machine_get_basic_state (thread_t thread,
  70                          struct machine_thread_all_state *state)
  71 {
  72   mach_msg_type_number_t count;
  73
  74   if (state->set & (1 << MACHINE_THREAD_STATE_FLAVOR))
  75     return 1;
  76
  77   count = MACHINE_THREAD_STATE_COUNT;
  78   if (__thread_get_state (thread, MACHINE_THREAD_STATE_FLAVOR,
  79                           (natural_t *) &state->basic,
  80                           &count) != KERN_SUCCESS ||
  81       count != MACHINE_THREAD_STATE_COUNT)
  82     /* What kind of thread?? */
  83     return 0;                   /* XXX */
  84
  85   state->set |= 1 << MACHINE_THREAD_STATE_FLAVOR;
  86   return 1;
  87 }