1  /* Machine dependent pthreads code.  Hurd/x86_64 version.
       2     Copyright (C) 2000-2023 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 Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the 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     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library;  if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <errno.h>
      20  #include <assert.h>
      21  
      22  #include <mach.h>
      23  #include <mach/machine/thread_status.h>
      24  #include <mach/x86_64/mach_i386.h>
      25  #include <mach/mig_errors.h>
      26  #include <mach/thread_status.h>
      27  
      28  int
      29  __thread_set_pcsptp (thread_t thread,
      30                       int set_ip, void *ip,
      31                       int set_sp, void *sp,
      32                       int set_tp, void *tp)
      33  {
      34    error_t err;
      35    struct i386_thread_state state;
      36    struct i386_fsgs_base_state fsgs_state;
      37    mach_msg_type_number_t state_count;
      38  
      39    state_count = i386_THREAD_STATE_COUNT;
      40  
      41    err = __thread_get_state (thread, i386_REGS_SEGS_STATE,
      42                              (thread_state_t) &state, &state_count);
      43    if (err)
      44      return err;
      45    assert (state_count == i386_THREAD_STATE_COUNT);
      46  
      47    if (set_sp)
      48      state.ursp = (uintptr_t) sp;
      49    if (set_ip)
      50      state.rip = (uintptr_t) ip;
      51  
      52    err = __thread_set_state (thread, i386_REGS_SEGS_STATE,
      53                              (thread_state_t) &state, i386_THREAD_STATE_COUNT);
      54    if (err)
      55      return err;
      56  
      57    if (set_tp)
      58      {
      59        state_count = i386_FSGS_BASE_STATE_COUNT;
      60        err = __thread_get_state (thread, i386_FSGS_BASE_STATE,
      61                                  (thread_state_t) &fsgs_state, &state_count);
      62        if (err)
      63          return err;
      64        assert (state_count == i386_FSGS_BASE_STATE_COUNT);
      65        fsgs_state.fs_base = (uintptr_t) tp;
      66        err = __thread_set_state (thread, i386_FSGS_BASE_STATE,
      67                                  (thread_state_t) &fsgs_state, state_count);
      68        if (err)
      69          return err;
      70      }
      71  
      72    return 0;
      73  }