diff options
Diffstat (limited to 'sysdeps/mach/hurd/hppa/trampoline.c')
| -rw-r--r-- | sysdeps/mach/hurd/hppa/trampoline.c | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/sysdeps/mach/hurd/hppa/trampoline.c b/sysdeps/mach/hurd/hppa/trampoline.c deleted file mode 100644 index bbb5b96..0000000 --- a/sysdeps/mach/hurd/hppa/trampoline.c +++ /dev/null @@ -1,230 +0,0 @@ -/* Set thread_state for sighandler, and sigcontext to recover. HPPA version. - Copyright (C) 1995, 1997, 1998 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 - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#include <hurd/signal.h> -#include "thread_state.h" -#include <assert.h> -#include <errno.h> -#include "hurdfault.h" - - -struct mach_msg_trap_regargs - { - /* These first four arguments are in registers 26..23. */ - mach_msg_size_t rcv_size; /* arg3 */ - mach_msg_size_t send_size; /* arg2 */ - mach_msg_option_t option; /* arg1 */ - mach_msg_header_t *msg; /* arg0 */ - }; - -struct sigcontext * -_hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler, - int signo, long int sigcode, - volatile int rpc_wait, - struct machine_thread_all_state *state) -{ - __label__ trampoline, rpc_wait_trampoline; - void *volatile sigsp; - struct sigcontext *scp; - - if (ss->context) - { - /* 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 - { - memcpy (&state->basic, &ss->context->sc_parisc_thread_state, - sizeof (state->basic)); - state->set = (1 << PARISC_THREAD_STATE); - assert (! rpc_wait); - /* The intr_port slot was cleared before sigreturn sent us the - sig_post that made us notice this pending signal, so - _hurd_internal_post_signal wouldn't do interrupt_operation. - After we return, our caller will set SCP->sc_intr_port (in the - new context) from SS->intr_port and clear SS->intr_port. Now - that we are restoring this old context recorded by sigreturn, - we want to restore its intr_port too; so store it in - SS->intr_port now, so it will end up in SCP->sc_intr_port - later. */ - ss->intr_port = ss->context->sc_intr_port; - } - /* If the sigreturn context was bogus, just ignore it. */ - ss->context = NULL; - } - else if (! machine_get_basic_state (ss->thread, state)) - return NULL; - - if ((ss->actions[signo].sa_flags & SA_ONSTACK) && - !(ss->sigaltstack.ss_flags & (SS_DISABLE|SS_ONSTACK))) - { - sigsp = ss->sigaltstack.ss_sp + ss->sigaltstack.ss_size; - ss->sigaltstack.ss_flags |= SS_ONSTACK; - /* XXX need to set up base of new stack for - per-thread variables, cthreads. */ - } - else - sigsp = (char *) state->basic.uesp; - - /* Push the signal context on the stack. */ - sigsp -= sizeof (*scp); - scp = sigsp; - - if (_hurdsig_catch_fault (SIGSEGV)) - { - assert (_hurdsig_fault_sigcode >= (long int) scp && - _hurdsig_fault_sigcode <= (long int) (scp + 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. */ - return NULL; - } - else - { - int ok; - - /* Set up the sigcontext from the current state of the thread. */ - - scp->sc_onstack = ss->sigaltstack.ss_flags & SS_ONSTACK ? 1 : 0; - - /* struct sigcontext is laid out so that starting at sc_regs mimics a - struct parisc_thread_state. */ - memcpy (&scp->sc_parisc_thread_state, - &state->basic, sizeof (state->basic)); - - _hurdsig_end_catch_fault (); - - if (! ok) - return NULL; - } - - /* Modify the thread state to call the trampoline code on the new stack. */ - if (rpc_wait) - { - /* The signalee thread was blocked in a mach_msg_trap system call, - 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_regargs *args = (void *) &state->basic.r23; - - if (_hurdsig_catch_fault (SIGSEGV)) - { - assert (_hurdsig_fault_sigcode >= (long int) args && - _hurdsig_fault_sigcode < (long int) (args + 1)); - /* Faulted accessing ARGS. Bomb. */ - return NULL; - } - - assert (args->option & MACH_RCV_MSG); - /* Disable the message-send, since it has already completed. The - calls we retry need only wait to receive the reply message. */ - args->option &= ~MACH_SEND_MSG; - - /* Limit the time to receive the reply message, in case the server - claimed that `interrupt_operation' succeeded but in fact the RPC - is hung. */ - args->option |= MACH_RCV_TIMEOUT; - args->timeout = _hurd_interrupted_rpc_timeout; - - _hurdsig_end_catch_fault (); - - MACHINE_THREAD_STATE_SET_PC (&state->basic, &&rpc_wait_trampoline); - /* The reply-receiving trampoline code runs initially on the original - user stack. We pass it the signal stack pointer in %r5. */ - state->basic.r5 = (int) sigsp; - /* After doing the message receive, the trampoline code will need to - update the %r28 value to be restored by sigreturn. To simplify - the assembly code, we pass the address of its slot in SCP to the - trampoline code in %r4. */ - state->basic.r4 = (unsigned int) &scp->sc_regs[27]; - /* Set up the arguments for the handler function in callee-saved - registers that we will move to the argument registers after - mach_msg_trap returns. */ - state->basic.r6 = signo; - state->basic.r7 = sigcode; - state->basic.r8 = (unsigned int) scp; - } - else - { - MACHINE_THREAD_STATE_SET_PC (&state->basic, &&trampoline); - state->basic.r20 = (unsigned int) sigsp; - /* Set up the arguments for the handler function. */ - state->basic.r26 = signo; - state->basic.r25 = sigcode; - state->basic.r24 = (unsigned int) scp; - } - - /* We pass the handler function to the trampoline code in %r9. */ - state->basic.r9 = (unsigned int) handler; - /* For convenience, we pass the address of __sigreturn in %r10. */ - state->basic.r10 = (unsigned int) &__sigreturn; - /* The extra copy of SCP for the __sigreturn arg goes in %r8. */ - state->basic.r10 = (unsigned int) scp; - - return scp; - - /* The trampoline code follows. This is not actually executed as part of - this function, it is just convenient to write it that way. */ - - rpc_wait_trampoline: - /* This is the entry point when we have an RPC reply message to receive - before running the handler. The MACH_MSG_SEND bit has already been - cleared in the OPTION argument on our stack. The interrupted user - stack pointer has not been changed, so the system call can find its - arguments; the signal stack pointer is in %ebx. For our convenience, - %ecx points to the sc_eax member of the sigcontext. */ - asm volatile - (/* Retry the interrupted mach_msg system call. */ - "ldil L%0xC0000000,%r1\nble 4(%sr7,%r1)\n" - "ldi -25, %r22\n" /* mach_msg_trap */ - /* When the sigcontext was saved, %r28 was MACH_RCV_INTERRUPTED. But - now the message receive has completed and the original caller of - the RPC (i.e. the code running when the signal arrived) needs to - see the final return value of the message receive in %r28. So - store the new %r28 value into the sc_regs[27] member of the sigcontext - (whose address is in %r4 to make this code simpler). */ - "stw (%r4), %r28\n" - /* Switch to the signal stack. */ - "copy %r5, %r30\n" - /* Copy the handler arguments to the argument registers. */ - "copy %r6, %r26\n" - "copy %r7, %r25\n" - "copy %r8, %r24\n" - ); - - trampoline: - /* Entry point for running the handler normally. The arguments to the - handler function are already in the argument registers. */ - asm volatile - ("bv (%r9); nop" /* Call the handler function. */ - "bv (%r10)\n" /* Call __sigreturn (SCP); never returns. */ - "copy %r8, %r26" /* Set up arg in delay slot. */ - : : "i" (&__sigreturn)); - - /* NOTREACHED */ - return NULL; -} |