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This commit is contained in:
Roland McGrath 1995-02-18 00:05:51 +00:00
parent 5e7cd26de6
commit 92c7a8e20e
4 changed files with 352 additions and 0 deletions
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86
sysdeps/mach/hurd/hppa/sigcontext.h Normal file
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/* Machine-dependent signal context structure for GNU Hurd. HPPA version.
Copyright (C) 1995 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/* Signal handlers are actually called:
void handler (int sig, int code, struct sigcontext *scp); */
/* State of this thread when the signal was taken. */
struct sigcontext
{
/* These first members are machine-independent. */
int sc_onstack; /* Nonzero if running on sigstack. */
__sigset_t sc_mask; /* Blocked signals to restore. */
/* MiG reply port this thread is using. */
unsigned int sc_reply_port;
/* Port this thread is doing an interruptible RPC on. */
unsigned int sc_intr_port;
/* Error code associated with this signal (interpreted as `error_t'). */
int sc_error;
/* All following members are machine-dependent. The rest of this
structure is written to be laid out identically to a `struct
parisc_thread_state'. trampoline.c knows this, so it must be
changed if this changes. */
#define sc_parisc_thread_state sc_flags /* Beginning of correspondence. */
/* "General" registers $1..$31. */
unsigned int sc_regs[31];
/* Control registers. */
unsigned int sc_cr11; /* sar */
/* These four registers make up the PC. */
unsigned int iioq_head;
unsigned int iisq_head;
unsigned int iioq_tail;
unsigned int iisq_tail;
unsigned int sc_cr15;
unsigned int sc_cr19;
unsigned int sc_cr20;
unsigned int sc_cr21;
unsigned int sc_cr22; /* ipsw */
unsigned int sc_bsd_goto; /* unused */
unsigned int sc_sr4;
unsigned int sc_sr0;
unsigned int sc_sr1;
unsigned int sc_sr2;
unsigned int sc_sr3;
unsigned int sc_sr5;
unsigned int sc_sr6;
unsigned int sc_sr7;
unsigned int sc_cr0;
unsigned int sc_cr8;
unsigned int sc_cr9;
unsigned int sc_cr10; /* unused */
unsigned int sc_cr12;
unsigned int sc_cr13;
unsigned int sc_cr24; /* unused */
unsigned int sc_cr25; /* unused */
unsigned int sc_cr26; /* unused */
unsigned sc_mpsfu_high; /* unused */
unsigned sc_mpsfu_low; /* unused */
unsigned sc_mpsfu_ovflo; /* unused */
int sc_pad;
/* Floating point registers $f0..$f31. */
double sc_fpregs[32];
};

258
sysdeps/mach/hurd/hppa/trampoline.c Normal file
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/* Set thread_state for sighandler, and sigcontext to recover. HPPA version.
Copyright (C) 1995 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, 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 & (SA_DISABLE|SA_ONSTACK)))
{
sigsp = ss->sigaltstack.ss_sp + ss->sigaltstack.ss_size;
ss->sigaltstack.ss_flags |= SA_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 & SA_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;
_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;
}
/* STATE describes a thread that had intr_port set (meaning it was inside
HURD_EINTR_RPC), after it has been thread_abort'd. It it looks to have
just completed a mach_msg_trap system call that returned
MACH_RCV_INTERRUPTED, return nonzero and set *PORT to the receive right
being waited on. */
int
_hurdsig_rcv_interrupted_p (struct machine_thread_all_state *state,
mach_port_t *port)
{
const unsigned int *volatile pc
= MACHINE_THREAD_STATE_PC (&state->basic);
const mach_port_t *rcv_name
= (void *) state->r30 -32-20; /* VA_ARG4 from <mach/machine/asm.h>. */
if (_hurdsig_catch_fault (SIGSEGV))
assert (_hurdsig_fault_sigcode == (long int) pc ||
_hurdsig_fault_sigcode == (long int) rcv_name);
else
{
int rcving = (state->basic.r28 == MACH_RCV_INTERRUPTED &&
pc == ???unfinished???);
if (rcving)
/* We did just return from a mach_msg_trap system call
doing a message receive that was interrupted.
Examine the parameters to find the receive right. */
*port = *rcv_name;
_hurdsig_end_catch_fault ();
if (rcving)
return 1;
}
return 0;
}

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*.gz *.Z *.tar *.tgz
=*
TODO COPYING* AUTHORS copyr-* copying.*
glibc-*

4
sysdeps/unix/bsd/sun/sunos4/.cvsignore Normal file
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*.gz *.Z *.tar *.tgz
=*
TODO COPYING* AUTHORS copyr-* copying.*
glibc-*