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authorRoland McGrath <roland@gnu.org>1996-01-04 17:00:45 +0000
committerRoland McGrath <roland@gnu.org>1996-01-04 17:00:45 +0000
commit7974fe2117b1308a46f16ae5803c64f75303521c (patch)
tree74144df8a67fabc8cc766351fffa87baaa8c909a /sysdeps/mach/hurd/i386/trampoline.c
parentfb8e70d6dd3a9c3a0e0d2713b5be3cbc9d7a6409 (diff)
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Thu Jan 4 11:35:18 1996 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* sysdeps/mach/hurd/setitimer.c: Code rearranged a bit to use new preemption interface. * sysdeps/mach/hurd/i386/trampoline.c (_hurd_setup_sighandler): Use _hurdsig_catch_memory_fault. * hurd/Makefile (headers): Add hurd/sigpreempt.h. (sig): Add catch-signal. * hurd/hurdfault.c (_hurdsig_fault_catch_exception_raise): Rewritten using a preempter in new interface. * hurd/hurdfault.h (_hurdsig_catch_fault): Likewise. (_hurdsig_catch_memory_fault): New macro.
Diffstat (limited to 'sysdeps/mach/hurd/i386/trampoline.c')
-rw-r--r--sysdeps/mach/hurd/i386/trampoline.c25
1 files changed, 9 insertions, 16 deletions
diff --git a/sysdeps/mach/hurd/i386/trampoline.c b/sysdeps/mach/hurd/i386/trampoline.c
index 9e947a46e7..f64539a384 100644
--- a/sysdeps/mach/hurd/i386/trampoline.c
+++ b/sysdeps/mach/hurd/i386/trampoline.c
@@ -1,5 +1,5 @@
/* Set thread_state for sighandler, and sigcontext to recover. i386 version.
-Copyright (C) 1994, 1995 Free Software Foundation, Inc.
+Copyright (C) 1994, 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
@@ -24,7 +24,7 @@ Cambridge, MA 02139, USA. */
#include <errno.h>
#include "hurdfault.h"
-
+
struct mach_msg_trap_args
{
void *retaddr; /* Address mach_msg_trap will return to. */
@@ -50,7 +50,7 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
extern const void _hurd_intr_rpc_msg_sp_restored;
void *volatile sigsp;
struct sigcontext *scp;
- struct
+ struct
{
int signo;
long int sigcode;
@@ -67,10 +67,7 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
/* We have a previous sigcontext that sigreturn was about
to restore when another signal arrived. We will just base
our setup on that. */
- if (_hurdsig_catch_fault (SIGSEGV))
- assert (_hurdsig_fault_sigcode >= (long int) ss->context &&
- _hurdsig_fault_sigcode < (long int) (ss->context + 1));
- else
+ if (! _hurdsig_catch_memory_fault (ss->context))
{
memcpy (&state->basic, &ss->context->sc_i386_thread_state,
sizeof (state->basic));
@@ -97,7 +94,7 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
per-thread variables, cthreads. */
}
/* This code has intimate knowledge of the special mach_msg system call
- done in intr-msg.c; that code does:
+ done in intr-msg.c; that code does:
movl %esp, %ecx
leal ARGS, %esp
_hurd_intr_rpc_msg_cx_sp: movl $-25, %eax
@@ -107,7 +104,7 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
We must check for the window during which %esp points at the
mach_msg arguments. The space below until %ecx is used by
the _hurd_intr_rpc_mach_msg frame, and must not be clobbered. */
- else if (state->basic.eip >= (int) &_hurd_intr_rpc_msg_cx_sp &&
+ else if (state->basic.eip >= (int) &_hurd_intr_rpc_msg_cx_sp &&
state->basic.eip < (int) &_hurd_intr_rpc_msg_sp_restored)
/* The SP now points at the mach_msg args, but there is more stack
space used below it. The real SP is saved in %ecx; we must push the
@@ -121,10 +118,8 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
sigsp -= sizeof (*stackframe);
stackframe = sigsp;
- if (_hurdsig_catch_fault (SIGSEGV))
+ if (_hurdsig_catch_memory_fault (stackframe))
{
- assert (_hurdsig_fault_sigcode >= (long int) stackframe &&
- _hurdsig_fault_sigcode <= (long int) (stackframe + 1));
/* We got a fault trying to write the stack frame.
We cannot set up the signal handler.
Returning NULL tells our caller, who will nuke us with a SIGILL. */
@@ -187,17 +182,15 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
still waiting for a reply. We will have it run the special
trampoline code which retries the message receive before running
the signal handler.
-
+
To do this we change the OPTION argument on its stack to enable only
message reception, since the request message has already been
sent. */
struct mach_msg_trap_args *args = (void *) state->basic.esp;
- if (_hurdsig_catch_fault (SIGSEGV))
+ if (_hurdsig_catch_memory_fault (args))
{
- assert (_hurdsig_fault_sigcode >= (long int) args &&
- _hurdsig_fault_sigcode < (long int) (args + 1));
/* Faulted accessing ARGS. Bomb. */
return NULL;
}