sysdeps/mach/hurd/i386/intr-msg.h

   1 /* Machine-dependent details of interruptible RPC messaging.  i386 version.
   2 Copyright (C) 1995 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
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20
  21 #define INTR_MSG_TRAP(msg, option, send_size, rcv_size, rcv_name, timeout, notify) \
  22 ({                                                                            \
  23   error_t err;                                                                \
  24   asm (".globl _hurd_intr_rpc_msg_do_trap\n"                                  \
  25        ".globl _hurd_intr_rpc_msg_in_trap\n"                                  \
  26        ".globl _hurd_intr_rpc_msg_cx_sp\n"                                    \
  27        ".globl _hurd_intr_rpc_msg_sp_restored\n"                              \
  28        "                                movl %%esp, %%ecx\n"                  \
  29        "                                leal %1, %%esp\n"                     \
  30        "_hurd_intr_rpc_msg_cx_sp:       movl $-25, %%eax\n"                   \
  31        "_hurd_intr_rpc_msg_do_trap:     lcall $7, $0 # status in %0\n"        \
  32        "_hurd_intr_rpc_msg_in_trap:     movl %%ecx, %%esp\n"                  \
  33        "_hurd_intr_rpc_msg_sp_restored:"                                      \
  34        : "=a" (err) : "m" ((&msg)[-1]) : "%ecx");                             \
  35   err;                                                                        \
  36 })
  37
  38
  39 static void inline
  40 INTR_MSG_BACK_OUT (struct i386_thread_state *state)
  41 {
  42   extern const void _hurd_intr_rpc_msg_cx_sp;
  43   if (state->eip >= (natural_t) &_hurd_intr_rpc_msg_cx_sp)
  44     state->uesp = state->ecx;
  45   else
  46     state->ecx = state->uesp;
  47 }