2.5-18.1

1 files changed, 0 insertions, 292 deletions

diff --git a/sysdeps/mach/hurd/mips/trampoline.c b/sysdeps/mach/hurd/mips/trampoline.c
deleted file mode 100644
index dd42dfc1c6..0000000000
--- a/sysdeps/mach/hurd/mips/trampoline.c
+++ /dev/null
@@ -1,292 +0,0 @@
-/* Set thread_state for sighandler, and sigcontext to recover.  MIPS version.
-   Copyright (C) 1996, 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 <hurd/userlink.h>
-#include "thread_state.h"
-#include <assert.h>
-#include <errno.h>
-#include "hurdfault.h"
-#include "intr-msg.h"
-
-
-struct sigcontext *
-_hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
-			int signo, struct hurd_signal_detail *detail,
-			volatile int rpc_wait,
-			struct machine_thread_all_state *state)
-{
-  __label__ trampoline, rpc_wait_trampoline, firewall;
-  void *volatile sigsp;
-  struct sigcontext *scp;
-  struct 
-    {
-      int signo;
-      long int sigcode;
-      struct sigcontext *scp;	/* Points to ctx, below.  */
-      void *sigreturn_addr;
-      void *sigreturn_returns_here;
-      struct sigcontext *return_scp; /* Same; arg to sigreturn.  */
-      struct sigcontext ctx;
-      struct hurd_userlink link;
-    } *stackframe;
-
-  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_memory_fault (ss->context))
-	{
-	  memcpy (&state->basic, &ss->context->sc_mips_thread_state,
-		  sizeof (state->basic));
-	  memcpy (&state->exc, &ss->context->sc_mips_exc_state,
-		  sizeof (state->exc));
-	  state->set = (1 << MIPS_THREAD_STATE) | (1 << MIPS_EXC_STATE);
-	  if (state->exc.coproc_state & SC_COPROC_USE_FPU)
-	    {
-	      memcpy (&state->fpu, &ss->context->sc_mips_float_state,
-		      sizeof (state->fpu));
-	      state->set |= (1 << MIPS_FLOAT_STATE);
-	    }
-	}
-    }
-
-  if (! machine_get_basic_state (ss->thread, state))
-    return NULL;
-
-  /* Save the original SP in the gratuitous s0 ($16) slot.
-     We may need to reset the SP (the `r29' slot) to avoid clobbering an
-     interrupted RPC frame.  */
-  state->basic.r16 = state->basic.r29;
-
-  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.r29;
-
-  /* Push the arguments to call `trampoline' on the stack.  */
-  sigsp -= sizeof (*stackframe);
-  stackframe = sigsp;
-
-  if (_hurdsig_catch_memory_fault (stackframe))
-    {
-      /* 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;
-
-      extern void _hurdsig_longjmp_from_handler (void *, jmp_buf, int);
-
-      /* Add a link to the thread's active-resources list.  We mark this as
-	 the only user of the "resource", so the cleanup function will be
-	 called by any longjmp which is unwinding past the signal frame.
-	 The cleanup function (in sigunwind.c) will make sure that all the
-	 appropriate cleanups done by sigreturn are taken care of.  */
-      stackframe->link.cleanup = &_hurdsig_longjmp_from_handler;
-      stackframe->link.cleanup_data = &stackframe->ctx;
-      stackframe->link.resource.next = NULL;
-      stackframe->link.resource.prevp = NULL;
-      stackframe->link.thread.next = ss->active_resources;
-      stackframe->link.thread.prevp = &ss->active_resources;
-      if (stackframe->link.thread.next)
-	stackframe->link.thread.next->thread.prevp
-	  = &stackframe->link.thread.next;
-      ss->active_resources = &stackframe->link;
-
-      /* Set up the arguments for the signal handler.  */
-      stackframe->signo = signo;
-      stackframe->sigcode = detail->code;
-      stackframe->scp = stackframe->return_scp = scp = &stackframe->ctx;
-      stackframe->sigreturn_addr = &__sigreturn;
-      stackframe->sigreturn_returns_here = &&firewall; /* Crash on return.  */
-
-      /* 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_gpr
-	 mimics a struct mips_thread_state.  */
-      memcpy (&scp->sc_mips_thread_state,
-	      &state->basic, sizeof (state->basic));
-
-      /* struct sigcontext is laid out so that starting at sc_cause
-	 mimics a struct mips_exc_state.  */
-      ok = machine_get_state (ss->thread, state, MIPS_EXC_STATE,
-			      &state->exc, &scp->sc_cause,
-			      sizeof (state->exc));
-
-      if (ok && (scp->sc_coproc_used & SC_COPROC_USE_FPU))
-	/* struct sigcontext is laid out so that starting at sc_fpr
-	   mimics a struct mips_float_state.  This state
-	   is only meaningful if the coprocessor was used.  */
-	  ok = machine_get_state (ss->thread, state, MIPS_FLOAT_STATE,
-				  &state->fpu, &scp->sc_mips_float_state,
-				  sizeof (state->fpu));
-
-      _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 in its registers to
-	 enable only message reception, since the request message has
-	 already been sent.  */
-
-      /* The system call arguments are stored in consecutive registers
-	 starting with a0 ($4).  */
-      struct mach_msg_trap_args *args = (void *) &state->basic.r4;
-
-      if (_hurdsig_catch_memory_fault (args))
-	{
-	  /* 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 ();
-
-      state->basic.pc = (int) &&rpc_wait_trampoline;
-      /* The reply-receiving trampoline code runs initially on the original
-	 user stack.  We pass it the signal stack pointer in s4 ($20).  */
-      state->basic.r29 = state->basic.r16; /* Restore mach_msg syscall SP.  */
-      state->basic.r20 = (int) sigsp;
-      /* After doing the message receive, the trampoline code will need to
-	 update the v0 ($2) 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 s5 ($21).  */
-      state->basic.r21 = (int) &scp->sc_gpr[1];
-      /* We must preserve the mach_msg_trap args in a0..t2 ($4..$10).
-	 Pass the handler args to the trampoline code in s1..s3 ($17..$19).  */
-      state->basic.r17 = signo;
-      state->basic.r18 = detail->code;
-      state->basic.r19 = (int) scp;
-    }
-  else
-    {
-      state->basic.pc = (int) &&trampoline;
-      state->basic.r29 = (int) sigsp;
-      state->basic.r4 = signo;
-      state->basic.r5 = detail->code;
-      state->basic.r6 = (int) scp;
-    }
-
-  /* We pass the handler function to the trampoline code in s6 ($22).  */
-  state->basic.r22 = (int) handler;
-  /* In the callee-saved register s0 ($16), we save the SCP value to pass
-     to __sigreturn after the handler returns.  */
-  state->basic.r16 = (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 in our registers.  For our convenience,
-     $3 points to the sc_gpr[1] member of the sigcontext (saved v0 ($2)).  */
-  asm volatile
-    (".set noat; .set noreorder; .set nomacro\n"
-     /* Retry the interrupted mach_msg system call.  */
-#ifdef __mips64
-     "dli $2, -25\n"		/* mach_msg_trap */
-#else
-     "li $2, -25\n"		/* mach_msg_trap */
-#endif
-     "syscall\n"
-     /* When the sigcontext was saved, v0 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 v0.  So
-	store the new v0 value into the sc_gpr[1] member of the sigcontext
-	(whose address is in s5 to make this code simpler).  */
-#ifdef __mips64
-     "sd $2, ($21)\n"
-#else
-     "sw $2, ($21)\n"
-#endif
-     /* Since the argument registers needed to have the mach_msg_trap
-	arguments, we've stored the arguments to the handler function
-	in registers s1..s3 ($17..$19).  */
-     "move $4, $17\n"
-     "move $5, $18\n"
-     "move $6, $19\n"
-     /* Switch to the signal stack.  */
-     "move $29, $20\n");
-
- trampoline:
-  /* Entry point for running the handler normally.  The arguments to the
-     handler function are already in the standard registers:
-
-       a0	SIGNO
-       a1	SIGCODE
-       a2	SCP
-     */
-  asm volatile
-    ("move $25, $22\n"		/* Copy s6 to t9 for MIPS ABI.  */
-     "jal $25; nop\n"		/* Call the handler function.  */
-     /* Call __sigreturn (SCP); this cannot return.  */
-#ifdef __mips64
-     "dla $1,%0\n"
-#else
-     "la $1,%0\n"
-#endif
-     "j $1\n"
-     "move $4, $16"		/* Set up arg from saved SCP in delay slot.  */
-     : : "i" (&__sigreturn));
-
-  /* NOTREACHED */
-  asm volatile (".set reorder; .set at; .set macro");
-
- firewall:
-  asm volatile ("hlt: j hlt");
-
-  return NULL;
-}