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

   1 /* Machine-dependent details of interruptible RPC messaging.  PowerPC version.
   2    Copyright (C) 1995,96,97,99,2001 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #define INTR_MSG_TRAP(msg, option, send_size, rcv_size, rcv_name, timeout, notify) \
  20 ({                                                                      \
  21   error_t err;                                                          \
  22   asm (".globl _hurd_intr_rpc_msg_do_trap\n"                            \
  23        ".globl _hurd_intr_rpc_msg_in_trap\n"                            \
  24        "                                mr 3, %1\n"                     \
  25        "                                mr 4, %2\n"                     \
  26        "                                mr 5, %3\n"                     \
  27        "                                mr 6, %4\n"                     \
  28        "                                mr 7, %5\n"                     \
  29        "                                mr 8, %6\n"                     \
  30        "                                mr 9, %7\n"                     \
  31        "                                li 0, -25\n"                    \
  32        "_hurd_intr_rpc_msg_do_trap:     sc\n"                           \
  33        "_hurd_intr_rpc_msg_in_trap:     mr 3, %0\n"                     \
  34        : "=r" (err)                                                     \
  35        : "r" (msg), "r" (option), "r" (send_size), "r" (rcv_size),      \
  36          "r" (rcv_name), "r" (timeout), "r" (notify)                    \
  37        : "0", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12");     \
  38   err;                                                                  \
  39 })
  40
  41 static void inline
  42 INTR_MSG_BACK_OUT (struct ppc_thread_state *state)
  43 {
  44   return;
  45 }
  46 \f
  47 #include "hurdfault.h"
  48
  49 /* This cannot be an inline function because it calls setjmp.  */
  50 #define SYSCALL_EXAMINE(state, callno)                                      \
  51 ({                                                                          \
  52   u_int32_t *p = (void *) ((state)->srr0 - 4);                              \
  53   int result;                                                               \
  54   _hurdsig_catch_memory_fault (p) ? 0 :                                     \
  55   ({                                                                        \
  56     if (result = (*p == 0x44000002))                                        \
  57       /* The PC is just after an `sc' instruction.                          \
  58          This is a system call in progress; %r0 holds the call number.  */  \
  59       *(callno) = (state)->r0;                                              \
  60     _hurdsig_end_catch_fault ();                                            \
  61     result;                                                                 \
  62   });                                                                       \
  63 })
  64
  65 struct mach_msg_trap_args
  66   {
  67     /* This is the order of arguments to mach_msg_trap.  */
  68     mach_msg_header_t *msg;
  69     mach_msg_option_t option;
  70     mach_msg_size_t send_size;
  71     mach_msg_size_t rcv_size;
  72     mach_port_t rcv_name;
  73     mach_msg_timeout_t timeout;
  74     mach_port_t notify;
  75   };
  76
  77 /* This cannot be an inline function because it calls setjmp.  */
  78 #define MSG_EXAMINE(state, msgid, rcv_name, send_name, option, timeout)   \
  79 ({                                                                        \
  80   mach_msg_header_t *msg = (mach_msg_header_t *) (state)->r3;             \
  81   *(option) = (mach_msg_option_t) (state)->r4;                            \
  82   *(rcv_name) = (mach_port_t) (state)->r7;                                \
  83   *(timeout) = (mach_msg_timeout_t) (state)->r8;                          \
  84   (msg == 0) ?                                                            \
  85     ({                                                                    \
  86       *(send_name) = MACH_PORT_NULL;                                      \
  87       *(msgid) = 0;                                                       \
  88       0;                                                                  \
  89     }) :                                                                  \
  90     (_hurdsig_catch_memory_fault (msg) ? -1 :                             \
  91         ({                                                                \
  92           *(send_name) = msg->msgh_remote_port;                           \
  93           *(msgid) = msg->msgh_id;                                        \
  94           _hurdsig_end_catch_fault ();                                    \
  95           0;                                                              \
  96         })                                                                \
  97     );                                                                    \
  98 })