aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/mach/hurd/i386/intr-msg.h
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/mach/hurd/i386/intr-msg.h')
-rw-r--r--sysdeps/mach/hurd/i386/intr-msg.h55
1 files changed, 54 insertions, 1 deletions
diff --git a/sysdeps/mach/hurd/i386/intr-msg.h b/sysdeps/mach/hurd/i386/intr-msg.h
index 353a6d2acd..43d244a182 100644
--- a/sysdeps/mach/hurd/i386/intr-msg.h
+++ b/sysdeps/mach/hurd/i386/intr-msg.h
@@ -1,5 +1,5 @@
/* Machine-dependent details of interruptible RPC messaging. i386 version.
-Copyright (C) 1995 Free Software Foundation, Inc.
+Copyright (C) 1995, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -45,3 +45,56 @@ INTR_MSG_BACK_OUT (struct i386_thread_state *state)
else
state->ecx = state->uesp;
}
+
+#include "hurdfault.h"
+
+static inline int
+SYSCALL_EXAMINE (struct i386_thread_state *state, int *callno)
+{
+ struct { unsigned int c[2]; } *p = (void *) (state->eip - 7);
+ int result;
+ if (_hurdsig_catch_memory_fault (p))
+ return 0;
+ if (result = p->c[0] == 0x0000009a && (p->c[1] & 0x00ffffff) == 0x00000700)
+ /* The PC is just after an `lcall $7,$0' instruction.
+ This is a system call in progress; %eax holds the call number. */
+ *callno = state->eax;
+ _hurdsig_end_catch_fault ();
+ return result;
+}
+
+
+struct mach_msg_trap_args
+ {
+ void *retaddr; /* Address mach_msg_trap will return to. */
+ /* This is the order of arguments to mach_msg_trap. */
+ mach_msg_header_t *msg;
+ mach_msg_option_t option;
+ mach_msg_size_t send_size;
+ mach_msg_size_t rcv_size;
+ mach_port_t rcv_name;
+ mach_msg_timeout_t timeout;
+ mach_port_t notify;
+ };
+
+
+static inline mach_port_t
+MSG_EXAMINE (struct i386_thread_state *state, int *msgid)
+{
+ const struct mach_msg_trap_args *args = (const void *) state->uesp;
+ mach_msg_header_t *msg;
+ mach_port_t send_port;
+
+ if (_hurdsig_catch_memory_fault (args))
+ return MACH_PORT_NULL;
+ msg = args->msg;
+ _hurdsig_end_catch_fault ();
+
+ if (_hurdsig_catch_memory_fault (msg))
+ return MACH_PORT_NULL;
+ send_port = msg->msgh_remote_port;
+ *msgid = msg->msgh_id;
+ _hurdsig_end_catch_fault ();
+
+ return send_port;
+}