glibc/sysdeps/mach/hurd/hppa/trampoline.c
Ulrich Drepper 7ce241a03e Update.
1998-07-31 17:59  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/generic/bits/byteswap.h: Fix problems with side effects.

	* manual/filesys.texi: Document truncate and ftruncate.
	Patch by Michael Deutschmann <michael@talamasca.wkpowerlink.com>.

	* shadow/putspent.c: Lock stream while generating the output.

	* sunrpc/clnt_unix.c: Use ucred instead of cmsgcred again.
	(__msgwrite): Rewrite accordingly.
	* sunrpc/svc_unix.c: Likewise.
	* sysdeps/unix/sysv/linux/Dist: Remove __recvmsg.S and __sendmsg.S.
	* sysdeps/unix/sysv/linux/Makefile [$(subdir)==socket]
	(sysdep_routines): Remove __sendmsg and __recvmsg.
	* sysdeps/unix/sysv/linux/__recvmsg.S: Removed.
	* sysdeps/unix/sysv/linux/__sendmsg.S: Removed.
	* sysdeps/unix/sysv/linux/recvmsg.c: Removed.
	* sysdeps/unix/sysv/linux/sendmsg.c: Removed.
	* sysdeps/unix/sysv/linux/recvmsg.S: New file.
	* sysdeps/unix/sysv/linux/sendmsg.S: New file.
	* sysdeps/unix/sysv/linux/bits/socket.h: Define SCM_CREDENTIALS and
	struct ucred.  Remove struct cmsgcred.
	Patches by Thorsten Kukuk.

1998-08-03  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* inet/rcmd.c (__ivaliduser): Allow '#' as comment character.

1998-08-08 14:42  Ulrich Drepper  <drepper@cygnus.com>

	* argp/argp-help.c: Prepare to be used outside glibc without gcc by
	adding usual alloca cruft.
	Reported by Eleftherios Gkioulekas <lf@amath.washington.edu>.

1998-04-05  Jim Meyering  <meyering@ascend.com>

	* lib/regex.c (WIDE_CHAR_SUPPORT): Define.
	This now depends on HAVE_BTOWC so systems that lack btowc (like
	solaris-2.5.1) don't lose.

1998-08-07  Mark Kettenis  <kettenis@phys.uva.nl>

	* sysdeps/generic/bits/sigaction.h: Remove definition of SA_DISABLE.
	* sysdeps/generic/bits/sigstack.h: Define SS_DISABLE, SS_ONSTACK,
	MINSIGSTKZ and SIGSTKSZ.  Definitions match BSD.
	* hurd/sigunwind.c (_hurdsig_longjmp_from_handler): Use SS_ONSTACK
	instead of SA_ONSTACK.
	* sysdeps/mach/hurd/sigaltstack.c (__sigaltstack): Renamed from
	sigaltstack, and created a weak alias.  Use SS_DISABLE and
	SS_ONSTACK instead of SA_DISABLE and SA_ONSTACK.
	* sysdeps/mach/hurd/sigstack.c (sigstack): Use SS_ONSTACK instead
	of SA_ONSTACK.  Call __sigaltstack instead of sigaltstack.
	* sysdeps/mach/hurd/i386/sigreturn.c (__sigreturn): Use SS_ONSTACK
	instead of SA_ONSTACK.
	* sysdeps/mach/hurd/alpha/sigreturn.c (__sigreturn): Likewise.
	* sysdeps/mach/hurd/mips/sigreturn.c (__sigreturn): Likewise.
	* sysdeps/mach/hurd/i386/trampoline.c (_hurd_setup_sighandler):
	Use SS_DISABLE instead of SA_DISABLE.  Use SS_ONSTACK instead of
	SA_ONSTACK where appropriate.
	* sysdeps/mach/hurd/alpha/trampoline.c (_hurd_setup_sighandler):
	Likewise.
	* sysdeps/mach/hurd/hppa/trampoline.c (_hurd_setup_sighandler):
	Likewise.
	* sysdeps/mach/hurd/mips/trampoline.c (_hurd_setup_sighandler):
	Likewise.
	* manual/signal.texi (Signal Stack): Talk about SS_DISABLE and
	SS_ONSTACK instead of SA_DISABLE and SA_ONSTACK in discussion of
	the `ss_flags' member of `struct sigaltstack'.

1998-08-05  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* libio/Makefile (routines) [$(versioning)=yes]: Add oldtmpfile.
	(shared-only-routines): Likewise.
	* libio/oldtmpfile.c: New file
	* stdio-common/tmpfile.c: Use __fdopen and __close.
	[USE_IN_LIBIO]: Use _IO_fdopen instead of _IO_new_fdopen.  Put
	tmpfile on symbol version GLIBC_2.1.
	* stdio-common/tmpfile64.c: Use __fdopen and __close.
	[USE_IN_LIBIO]: Use _IO_fdopen instead of _IO_new_fdopen.
	* stdio-common/Version [GLIBC_2.1]: Add tmpfile.
	* stdio-common/tempnam.c: Use __strdup instead of strdup.
	* sysdeps/posix/fdopen.c: Define __fdopen and make fdopen weak
	alias.
	* sysdeps/generic/fdopen.c: Likewise.
	* sysdeps/mach/hurd/fdopen.c: Likewise.
	* stdio/stdio.h: Declare __fdopen.
	* sunrpc/openchild.c: Use __fdopen instead of fdopen.
	[USE_IN_LIBIO]: Map __fdopen to _IO_fdopen.
	* sysdeps/posix/tempname.c (__gen_tempname): Don't bother checking
	__stub_open64, it is never defined.

1998-08-05  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* libio/iofopen64.c: Fix typo.  Avoid unnessary casts.
	* libio/iopopen.c: Unlink file before freeing it if command
	creation failed.  Avoid unnessary casts.
	* libio/iofdopen.c:  Avoid unnecessary cast.
	* pwd/fgetpwent_r.c [USE_IN_LIBIO]: Map funlockfile to
	_IO_funlockfile.
	* pwd/fgetspent_r.c [USE_IN_LIBIO]: Likewise.

1998-08-06  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* grp/grp.h, pwd/pwd.h: Don't declare __grpopen, __grpread,
	__grpalloc, __grpscan and the corresponding pwd functions, they
	were removed long ago.

1998-08-06  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* math/libm-test.c (csqrt_test): Adjust epsilons.
	(casinh_test): Likewise.

1998-08-06  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* posix/globtest.sh: Fix typo.  Remove second test output file.

1998-08-07  Cristian Gafton  <gafton@redhat.com>

	* pwd/putpwent.c (putpwent): Avoid writting (none) in the passwd file.
	* shadow/putspent.c (putspent): Likewise.
	* grp/putgrent.c: New file.
	* grp/Makefile (routines): Add putgrent.
	* grp/Versions [GLIBC_2.1]: Add putgrent.
	* grp/grp.h: Add putgrent prototype.

1998-08-04 19:33  Ulrich Drepper  <drepper@cygnus.com>

	* elf/elf.h: More ELF definitions.
1998-08-08 20:02:34 +00:00

231 lines
8.5 KiB
C

/* 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 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., 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;
}