diff options
Diffstat (limited to 'sysdeps/mach/hurd/i386/trampoline.c')
| -rw-r--r-- | sysdeps/mach/hurd/i386/trampoline.c | 25 |
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; } |