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

   1 /* Machine-dependent details of interruptible RPC messaging.  Alpha version.
   2    Copyright (C) 2002 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #define INTR_MSG_TRAP(msg, option, send_size, rcv_size, rcv_name, timeout, notify) \
  21 ({                                                                      \
  22   error_t err;                                                          \
  23   asm (".globl _hurd_intr_rpc_msg_do_trap\n"                            \
  24        ".globl _hurd_intr_rpc_msg_in_trap\n"                            \
  25        "                                mov %1, $16\n"                  \
  26        "                                mov %2, $17\n"                  \
  27        "                                mov %3, $18\n"                  \
  28        "                                mov %4, $19\n"                  \
  29        "                                mov %5, $20\n"                  \
  30        "                                mov %6, $21\n"                  \
  31        "                                mov %7, $1\n"                   \
  32        "                                lda $0, -25\n"                  \
  33        "_hurd_intr_rpc_msg_do_trap:     callsys\n"                      \
  34        "_hurd_intr_rpc_msg_in_trap:     ret\n"                          \
  35        : "=r" (err)                                                     \
  36        : "r" (msg), "r" (option), "r" (send_size), "r" (rcv_size),      \
  37          "r" (rcv_name), "r" (timeout), "r" (notify)                    \
  38        : "16", "17", "18", "19", "20", "21", "1", "0");                 \
  39   err;                                                                  \
  40 })
  41
  42 static void inline
  43 INTR_MSG_BACK_OUT (struct alpha_thread_state *state)
  44 {
  45   return;
  46 }
  47 \f
  48 #include "hurdfault.h"
  49
  50 /* This cannot be an inline function because it calls setjmp.  */
  51 #define SYSCALL_EXAMINE(state, callno)                                      \
  52 ({                                                                          \
  53   u_int32_t *p = (void *) ((state)->pc - 4);                                \
  54   int result;                                                               \
  55   _hurdsig_catch_memory_fault (p) ? 0 :                                     \
  56   ({                                                                        \
  57     result = (*p == 0x00000083);                                            \
  58     _hurdsig_end_catch_fault ();                                            \
  59     if (result)                                                             \
  60       /* The PC is just after a `callsys' instruction.                      \
  61          This is a system call in progress; v0 holds the call number.  */   \
  62       *(callno) = (state)->r0;                                              \
  63     result;                                                                 \
  64   });                                                                       \
  65 })
  66
  67 struct mach_msg_trap_args
  68   {
  69     /* This is the order of arguments to mach_msg_trap.  */
  70     mach_msg_header_t *msg;
  71     mach_msg_option_t option;
  72     mach_msg_size_t send_size;
  73     mach_msg_size_t rcv_size;
  74     mach_port_t rcv_name;
  75     mach_msg_timeout_t timeout;
  76     mach_port_t notify;
  77   };
  78
  79 /* This cannot be an inline function because it calls setjmp.  */
  80 #define MSG_EXAMINE(state, msgid, rcv_name, send_name, option, timeout)   \
  81 ({                                                                        \
  82   mach_msg_header_t *msg = (mach_msg_header_t *) (state)->r16;            \
  83   *(option) = (mach_msg_option_t) (state)->r17;                           \
  84   *(rcv_name) = (mach_port_t) (state)->r18;                               \
  85   *(timeout) = (mach_msg_timeout_t) (state)->r19;                         \
  86   (msg == 0) ?                                                            \
  87     ({                                                                    \
  88       *(send_name) = MACH_PORT_NULL;                                      \
  89       *(msgid) = 0;                                                       \
  90       0;                                                                  \
  91     }) :                                                                  \
  92     (_hurdsig_catch_memory_fault (msg) ? -1 :                             \
  93         ({                                                                \
  94           *(send_name) = msg->msgh_remote_port;                           \
  95           *(msgid) = msg->msgh_id;                                        \
  96           _hurdsig_end_catch_fault ();                                    \
  97           0;                                                              \
  98         })                                                                \
  99     );                                                                    \
 100 })