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[rfa] gdbserver signal handling


And here's the other patch I've been meaning to finish.  With this,
signals.exp now passes on a remote GDBserver, and we get the signal numbers
translated correctly.

OK?

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

2002-02-27  Daniel Jacobowitz  <drow@mvista.com>

	* gdbserver/server.c (main): Call target_signal_to_host_p
	and target_signal_to_host on signals received from the remote.
	* gdbserver/remote-utils.c (prepare_resume_reply): Call
	target_signal_from_host on signals sent to the remote.
	* gdbserver/signals.c: New file.
	* gdbserver/server.h: Add prototypes.
	* gdbserver/Makefile.in: Add signals.o.

diff -uNr gdbserver.1/Makefile.in gdbserver/Makefile.in
--- gdbserver.1/Makefile.in	Wed Feb 27 21:47:26 2002
+++ gdbserver/Makefile.in	Wed Feb 27 22:05:05 2002
@@ -120,7 +120,7 @@
 SOURCES = $(SFILES)
 TAGFILES = $(SOURCES) ${HFILES} ${ALLPARAM} ${POSSLIBS} 
 
-OBS = utils.o $(DEPFILES) server.o remote-utils.o regcache.o
+OBS = utils.o $(DEPFILES) server.o remote-utils.o signals.o regcache.o
 
 # Prevent Sun make from putting in the machine type.  Setting
 # TARGET_ARCH to nothing works for SunOS 3, 4.0, but not for 4.1.
diff -uNr gdbserver.1/remote-utils.c gdbserver/remote-utils.c
--- gdbserver.1/remote-utils.c	Sun Feb 24 18:33:52 2002
+++ gdbserver/remote-utils.c	Wed Feb 27 22:04:39 2002
@@ -465,17 +465,15 @@
 void
 prepare_resume_reply (char *buf, char status, unsigned char signo)
 {
-  int nib;
+  int nib, sig;
 
   *buf++ = status;
 
-  /* FIXME!  Should be converting this signal number (numbered
-     according to the signal numbering of the system we are running on)
-     to the signal numbers used by the gdb protocol (see enum target_signal
-     in gdb/target.h).  */
-  nib = ((signo & 0xf0) >> 4);
+  sig = (int)target_signal_from_host (signo);
+
+  nib = ((sig & 0xf0) >> 4);
   *buf++ = tohex (nib);
-  nib = signo & 0x0f;
+  nib = sig & 0x0f;
   *buf++ = tohex (nib);
 
   if (status == 'T')
diff -uNr gdbserver.1/server.c gdbserver/server.c
--- gdbserver.1/server.c	Thu Feb 14 01:08:30 2002
+++ gdbserver/server.c	Wed Feb 27 22:04:39 2002
@@ -190,13 +190,21 @@
 	      break;
 	    case 'C':
 	      convert_ascii_to_int (own_buf + 1, &sig, 1);
-	      myresume (0, sig);
+	      if (target_signal_to_host_p (sig))
+		signal = target_signal_to_host (sig);
+	      else
+		signal = 0;
+	      myresume (0, signal);
 	      signal = mywait (&status);
 	      prepare_resume_reply (own_buf, status, signal);
 	      break;
 	    case 'S':
 	      convert_ascii_to_int (own_buf + 1, &sig, 1);
-	      myresume (1, sig);
+	      if (target_signal_to_host_p (sig))
+		signal = target_signal_to_host (sig);
+	      else
+		signal = 0;
+	      myresume (1, signal);
 	      signal = mywait (&status);
 	      prepare_resume_reply (own_buf, status, signal);
 	      break;
diff -uNr gdbserver.1/server.h gdbserver/server.h
--- gdbserver.1/server.h	Thu Feb 14 01:05:36 2002
+++ gdbserver/server.h	Wed Feb 27 22:18:52 2002
@@ -84,6 +84,10 @@
 void decode_M_packet (char *from, CORE_ADDR * mem_addr_ptr,
 		      unsigned int *len_ptr, char *to);
 
+/* Functions from ``signals.c''.  */
+int target_signal_from_host (int hostsig);
+int target_signal_to_host_p (int oursig);
+int target_signal_to_host (int oursig);
 
 /* Functions from utils.c */
 
diff -uNr gdbserver.1/signals.c gdbserver/signals.c
--- gdbserver.1/signals.c	Wed Dec 31 19:00:00 1969
+++ gdbserver/signals.c	Wed Feb 27 22:17:59 2002
@@ -0,0 +1,770 @@
+/* Functions to convert to and from the target signal protocol.
+   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+   2000, 2001, 2002 Free Software Foundation, Inc.
+   Contributed by Cygnus Support.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "server.h"
+
+#include <signal.h>
+
+/* This enum defines a part of the GDB remote protocol.  It should be kept
+   in sync with the copy in "defs.h".  */
+
+enum target_signal
+  {
+    /* Used some places to record the concept that there is no signal.  */
+    TARGET_SIGNAL_0 = 0,
+    TARGET_SIGNAL_FIRST = 0,
+    TARGET_SIGNAL_HUP = 1,
+    TARGET_SIGNAL_INT = 2,
+    TARGET_SIGNAL_QUIT = 3,
+    TARGET_SIGNAL_ILL = 4,
+    TARGET_SIGNAL_TRAP = 5,
+    TARGET_SIGNAL_ABRT = 6,
+    TARGET_SIGNAL_EMT = 7,
+    TARGET_SIGNAL_FPE = 8,
+    TARGET_SIGNAL_KILL = 9,
+    TARGET_SIGNAL_BUS = 10,
+    TARGET_SIGNAL_SEGV = 11,
+    TARGET_SIGNAL_SYS = 12,
+    TARGET_SIGNAL_PIPE = 13,
+    TARGET_SIGNAL_ALRM = 14,
+    TARGET_SIGNAL_TERM = 15,
+    TARGET_SIGNAL_URG = 16,
+    TARGET_SIGNAL_STOP = 17,
+    TARGET_SIGNAL_TSTP = 18,
+    TARGET_SIGNAL_CONT = 19,
+    TARGET_SIGNAL_CHLD = 20,
+    TARGET_SIGNAL_TTIN = 21,
+    TARGET_SIGNAL_TTOU = 22,
+    TARGET_SIGNAL_IO = 23,
+    TARGET_SIGNAL_XCPU = 24,
+    TARGET_SIGNAL_XFSZ = 25,
+    TARGET_SIGNAL_VTALRM = 26,
+    TARGET_SIGNAL_PROF = 27,
+    TARGET_SIGNAL_WINCH = 28,
+    TARGET_SIGNAL_LOST = 29,
+    TARGET_SIGNAL_USR1 = 30,
+    TARGET_SIGNAL_USR2 = 31,
+    TARGET_SIGNAL_PWR = 32,
+    /* Similar to SIGIO.  Perhaps they should have the same number.  */
+    TARGET_SIGNAL_POLL = 33,
+    TARGET_SIGNAL_WIND = 34,
+    TARGET_SIGNAL_PHONE = 35,
+    TARGET_SIGNAL_WAITING = 36,
+    TARGET_SIGNAL_LWP = 37,
+    TARGET_SIGNAL_DANGER = 38,
+    TARGET_SIGNAL_GRANT = 39,
+    TARGET_SIGNAL_RETRACT = 40,
+    TARGET_SIGNAL_MSG = 41,
+    TARGET_SIGNAL_SOUND = 42,
+    TARGET_SIGNAL_SAK = 43,
+    TARGET_SIGNAL_PRIO = 44,
+    TARGET_SIGNAL_REALTIME_33 = 45,
+    TARGET_SIGNAL_REALTIME_34 = 46,
+    TARGET_SIGNAL_REALTIME_35 = 47,
+    TARGET_SIGNAL_REALTIME_36 = 48,
+    TARGET_SIGNAL_REALTIME_37 = 49,
+    TARGET_SIGNAL_REALTIME_38 = 50,
+    TARGET_SIGNAL_REALTIME_39 = 51,
+    TARGET_SIGNAL_REALTIME_40 = 52,
+    TARGET_SIGNAL_REALTIME_41 = 53,
+    TARGET_SIGNAL_REALTIME_42 = 54,
+    TARGET_SIGNAL_REALTIME_43 = 55,
+    TARGET_SIGNAL_REALTIME_44 = 56,
+    TARGET_SIGNAL_REALTIME_45 = 57,
+    TARGET_SIGNAL_REALTIME_46 = 58,
+    TARGET_SIGNAL_REALTIME_47 = 59,
+    TARGET_SIGNAL_REALTIME_48 = 60,
+    TARGET_SIGNAL_REALTIME_49 = 61,
+    TARGET_SIGNAL_REALTIME_50 = 62,
+    TARGET_SIGNAL_REALTIME_51 = 63,
+    TARGET_SIGNAL_REALTIME_52 = 64,
+    TARGET_SIGNAL_REALTIME_53 = 65,
+    TARGET_SIGNAL_REALTIME_54 = 66,
+    TARGET_SIGNAL_REALTIME_55 = 67,
+    TARGET_SIGNAL_REALTIME_56 = 68,
+    TARGET_SIGNAL_REALTIME_57 = 69,
+    TARGET_SIGNAL_REALTIME_58 = 70,
+    TARGET_SIGNAL_REALTIME_59 = 71,
+    TARGET_SIGNAL_REALTIME_60 = 72,
+    TARGET_SIGNAL_REALTIME_61 = 73,
+    TARGET_SIGNAL_REALTIME_62 = 74,
+    TARGET_SIGNAL_REALTIME_63 = 75,
+
+    /* Used internally by Solaris threads.  See signal(5) on Solaris.  */
+    TARGET_SIGNAL_CANCEL = 76,
+
+    /* Yes, this pains me, too.  But LynxOS didn't have SIG32, and now
+       GNU/Linux does, and we can't disturb the numbering, since it's
+       part of the remote protocol.  Note that in some GDB's
+       TARGET_SIGNAL_REALTIME_32 is number 76.  */
+    TARGET_SIGNAL_REALTIME_32,
+    /* Yet another pain, IRIX 6 has SIG64. */
+    TARGET_SIGNAL_REALTIME_64,
+    /* Yet another pain, GNU/Linux MIPS might go up to 128. */
+    TARGET_SIGNAL_REALTIME_65,
+    TARGET_SIGNAL_REALTIME_66,
+    TARGET_SIGNAL_REALTIME_67,
+    TARGET_SIGNAL_REALTIME_68,
+    TARGET_SIGNAL_REALTIME_69,
+    TARGET_SIGNAL_REALTIME_70,
+    TARGET_SIGNAL_REALTIME_71,
+    TARGET_SIGNAL_REALTIME_72,
+    TARGET_SIGNAL_REALTIME_73,
+    TARGET_SIGNAL_REALTIME_74,
+    TARGET_SIGNAL_REALTIME_75,
+    TARGET_SIGNAL_REALTIME_76,
+    TARGET_SIGNAL_REALTIME_77,
+    TARGET_SIGNAL_REALTIME_78,
+    TARGET_SIGNAL_REALTIME_79,
+    TARGET_SIGNAL_REALTIME_80,
+    TARGET_SIGNAL_REALTIME_81,
+    TARGET_SIGNAL_REALTIME_82,
+    TARGET_SIGNAL_REALTIME_83,
+    TARGET_SIGNAL_REALTIME_84,
+    TARGET_SIGNAL_REALTIME_85,
+    TARGET_SIGNAL_REALTIME_86,
+    TARGET_SIGNAL_REALTIME_87,
+    TARGET_SIGNAL_REALTIME_88,
+    TARGET_SIGNAL_REALTIME_89,
+    TARGET_SIGNAL_REALTIME_90,
+    TARGET_SIGNAL_REALTIME_91,
+    TARGET_SIGNAL_REALTIME_92,
+    TARGET_SIGNAL_REALTIME_93,
+    TARGET_SIGNAL_REALTIME_94,
+    TARGET_SIGNAL_REALTIME_95,
+    TARGET_SIGNAL_REALTIME_96,
+    TARGET_SIGNAL_REALTIME_97,
+    TARGET_SIGNAL_REALTIME_98,
+    TARGET_SIGNAL_REALTIME_99,
+    TARGET_SIGNAL_REALTIME_100,
+    TARGET_SIGNAL_REALTIME_101,
+    TARGET_SIGNAL_REALTIME_102,
+    TARGET_SIGNAL_REALTIME_103,
+    TARGET_SIGNAL_REALTIME_104,
+    TARGET_SIGNAL_REALTIME_105,
+    TARGET_SIGNAL_REALTIME_106,
+    TARGET_SIGNAL_REALTIME_107,
+    TARGET_SIGNAL_REALTIME_108,
+    TARGET_SIGNAL_REALTIME_109,
+    TARGET_SIGNAL_REALTIME_110,
+    TARGET_SIGNAL_REALTIME_111,
+    TARGET_SIGNAL_REALTIME_112,
+    TARGET_SIGNAL_REALTIME_113,
+    TARGET_SIGNAL_REALTIME_114,
+    TARGET_SIGNAL_REALTIME_115,
+    TARGET_SIGNAL_REALTIME_116,
+    TARGET_SIGNAL_REALTIME_117,
+    TARGET_SIGNAL_REALTIME_118,
+    TARGET_SIGNAL_REALTIME_119,
+    TARGET_SIGNAL_REALTIME_120,
+    TARGET_SIGNAL_REALTIME_121,
+    TARGET_SIGNAL_REALTIME_122,
+    TARGET_SIGNAL_REALTIME_123,
+    TARGET_SIGNAL_REALTIME_124,
+    TARGET_SIGNAL_REALTIME_125,
+    TARGET_SIGNAL_REALTIME_126,
+    TARGET_SIGNAL_REALTIME_127,
+
+    /* Mach exceptions */
+    TARGET_EXC_BAD_ACCESS,
+    TARGET_EXC_BAD_INSTRUCTION,
+    TARGET_EXC_ARITHMETIC,
+    TARGET_EXC_EMULATION,
+    TARGET_EXC_SOFTWARE,
+    TARGET_EXC_BREAKPOINT,
+
+    TARGET_SIGNAL_INFO,
+
+    /* Some signal we don't know about.  */
+    TARGET_SIGNAL_UNKNOWN,
+
+    /* Use whatever signal we use when one is not specifically specified
+       (for passing to proceed and so on).  */
+    TARGET_SIGNAL_DEFAULT,
+
+    /* Last and unused enum value, for sizing arrays, etc.  */
+    TARGET_SIGNAL_LAST
+  };
+
+/* Convert host signal to our signals.  */
+int
+target_signal_from_host (int hostsig)
+{
+  /* A switch statement would make sense but would require special kludges
+     to deal with the cases where more than one signal has the same number.  */
+
+  if (hostsig == 0)
+    return TARGET_SIGNAL_0;
+
+#if defined (SIGHUP)
+  if (hostsig == SIGHUP)
+    return TARGET_SIGNAL_HUP;
+#endif
+#if defined (SIGINT)
+  if (hostsig == SIGINT)
+    return TARGET_SIGNAL_INT;
+#endif
+#if defined (SIGQUIT)
+  if (hostsig == SIGQUIT)
+    return TARGET_SIGNAL_QUIT;
+#endif
+#if defined (SIGILL)
+  if (hostsig == SIGILL)
+    return TARGET_SIGNAL_ILL;
+#endif
+#if defined (SIGTRAP)
+  if (hostsig == SIGTRAP)
+    return TARGET_SIGNAL_TRAP;
+#endif
+#if defined (SIGABRT)
+  if (hostsig == SIGABRT)
+    return TARGET_SIGNAL_ABRT;
+#endif
+#if defined (SIGEMT)
+  if (hostsig == SIGEMT)
+    return TARGET_SIGNAL_EMT;
+#endif
+#if defined (SIGFPE)
+  if (hostsig == SIGFPE)
+    return TARGET_SIGNAL_FPE;
+#endif
+#if defined (SIGKILL)
+  if (hostsig == SIGKILL)
+    return TARGET_SIGNAL_KILL;
+#endif
+#if defined (SIGBUS)
+  if (hostsig == SIGBUS)
+    return TARGET_SIGNAL_BUS;
+#endif
+#if defined (SIGSEGV)
+  if (hostsig == SIGSEGV)
+    return TARGET_SIGNAL_SEGV;
+#endif
+#if defined (SIGSYS)
+  if (hostsig == SIGSYS)
+    return TARGET_SIGNAL_SYS;
+#endif
+#if defined (SIGPIPE)
+  if (hostsig == SIGPIPE)
+    return TARGET_SIGNAL_PIPE;
+#endif
+#if defined (SIGALRM)
+  if (hostsig == SIGALRM)
+    return TARGET_SIGNAL_ALRM;
+#endif
+#if defined (SIGTERM)
+  if (hostsig == SIGTERM)
+    return TARGET_SIGNAL_TERM;
+#endif
+#if defined (SIGUSR1)
+  if (hostsig == SIGUSR1)
+    return TARGET_SIGNAL_USR1;
+#endif
+#if defined (SIGUSR2)
+  if (hostsig == SIGUSR2)
+    return TARGET_SIGNAL_USR2;
+#endif
+#if defined (SIGCLD)
+  if (hostsig == SIGCLD)
+    return TARGET_SIGNAL_CHLD;
+#endif
+#if defined (SIGCHLD)
+  if (hostsig == SIGCHLD)
+    return TARGET_SIGNAL_CHLD;
+#endif
+#if defined (SIGPWR)
+  if (hostsig == SIGPWR)
+    return TARGET_SIGNAL_PWR;
+#endif
+#if defined (SIGWINCH)
+  if (hostsig == SIGWINCH)
+    return TARGET_SIGNAL_WINCH;
+#endif
+#if defined (SIGURG)
+  if (hostsig == SIGURG)
+    return TARGET_SIGNAL_URG;
+#endif
+#if defined (SIGIO)
+  if (hostsig == SIGIO)
+    return TARGET_SIGNAL_IO;
+#endif
+#if defined (SIGPOLL)
+  if (hostsig == SIGPOLL)
+    return TARGET_SIGNAL_POLL;
+#endif
+#if defined (SIGSTOP)
+  if (hostsig == SIGSTOP)
+    return TARGET_SIGNAL_STOP;
+#endif
+#if defined (SIGTSTP)
+  if (hostsig == SIGTSTP)
+    return TARGET_SIGNAL_TSTP;
+#endif
+#if defined (SIGCONT)
+  if (hostsig == SIGCONT)
+    return TARGET_SIGNAL_CONT;
+#endif
+#if defined (SIGTTIN)
+  if (hostsig == SIGTTIN)
+    return TARGET_SIGNAL_TTIN;
+#endif
+#if defined (SIGTTOU)
+  if (hostsig == SIGTTOU)
+    return TARGET_SIGNAL_TTOU;
+#endif
+#if defined (SIGVTALRM)
+  if (hostsig == SIGVTALRM)
+    return TARGET_SIGNAL_VTALRM;
+#endif
+#if defined (SIGPROF)
+  if (hostsig == SIGPROF)
+    return TARGET_SIGNAL_PROF;
+#endif
+#if defined (SIGXCPU)
+  if (hostsig == SIGXCPU)
+    return TARGET_SIGNAL_XCPU;
+#endif
+#if defined (SIGXFSZ)
+  if (hostsig == SIGXFSZ)
+    return TARGET_SIGNAL_XFSZ;
+#endif
+#if defined (SIGWIND)
+  if (hostsig == SIGWIND)
+    return TARGET_SIGNAL_WIND;
+#endif
+#if defined (SIGPHONE)
+  if (hostsig == SIGPHONE)
+    return TARGET_SIGNAL_PHONE;
+#endif
+#if defined (SIGLOST)
+  if (hostsig == SIGLOST)
+    return TARGET_SIGNAL_LOST;
+#endif
+#if defined (SIGWAITING)
+  if (hostsig == SIGWAITING)
+    return TARGET_SIGNAL_WAITING;
+#endif
+#if defined (SIGCANCEL)
+  if (hostsig == SIGCANCEL)
+    return TARGET_SIGNAL_CANCEL;
+#endif
+#if defined (SIGLWP)
+  if (hostsig == SIGLWP)
+    return TARGET_SIGNAL_LWP;
+#endif
+#if defined (SIGDANGER)
+  if (hostsig == SIGDANGER)
+    return TARGET_SIGNAL_DANGER;
+#endif
+#if defined (SIGGRANT)
+  if (hostsig == SIGGRANT)
+    return TARGET_SIGNAL_GRANT;
+#endif
+#if defined (SIGRETRACT)
+  if (hostsig == SIGRETRACT)
+    return TARGET_SIGNAL_RETRACT;
+#endif
+#if defined (SIGMSG)
+  if (hostsig == SIGMSG)
+    return TARGET_SIGNAL_MSG;
+#endif
+#if defined (SIGSOUND)
+  if (hostsig == SIGSOUND)
+    return TARGET_SIGNAL_SOUND;
+#endif
+#if defined (SIGSAK)
+  if (hostsig == SIGSAK)
+    return TARGET_SIGNAL_SAK;
+#endif
+#if defined (SIGPRIO)
+  if (hostsig == SIGPRIO)
+    return TARGET_SIGNAL_PRIO;
+#endif
+
+  /* Mach exceptions.  Assumes that the values for EXC_ are positive! */
+#if defined (EXC_BAD_ACCESS) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_BAD_ACCESS)
+    return TARGET_EXC_BAD_ACCESS;
+#endif
+#if defined (EXC_BAD_INSTRUCTION) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_BAD_INSTRUCTION)
+    return TARGET_EXC_BAD_INSTRUCTION;
+#endif
+#if defined (EXC_ARITHMETIC) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_ARITHMETIC)
+    return TARGET_EXC_ARITHMETIC;
+#endif
+#if defined (EXC_EMULATION) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_EMULATION)
+    return TARGET_EXC_EMULATION;
+#endif
+#if defined (EXC_SOFTWARE) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_SOFTWARE)
+    return TARGET_EXC_SOFTWARE;
+#endif
+#if defined (EXC_BREAKPOINT) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_BREAKPOINT)
+    return TARGET_EXC_BREAKPOINT;
+#endif
+
+#if defined (SIGINFO)
+  if (hostsig == SIGINFO)
+    return TARGET_SIGNAL_INFO;
+#endif
+
+#if defined (REALTIME_LO)
+  if (hostsig >= REALTIME_LO && hostsig < REALTIME_HI)
+    {
+      /* This block of TARGET_SIGNAL_REALTIME value is in order.  */
+      if (33 <= hostsig && hostsig <= 63)
+	return (enum target_signal)
+	  (hostsig - 33 + (int) TARGET_SIGNAL_REALTIME_33);
+      else if (hostsig == 32)
+	return TARGET_SIGNAL_REALTIME_32;
+      else if (64 <= hostsig && hostsig <= 127)
+	return (enum target_signal)
+	  (hostsig - 64 + (int) TARGET_SIGNAL_REALTIME_64);
+      else
+	error ("GDB bug: target.c (target_signal_from_host): unrecognized real-time signal");
+    }
+#endif
+
+#if defined (SIGRTMIN)
+  if (hostsig >= SIGRTMIN && hostsig <= SIGRTMAX)
+    {
+      /* This block of TARGET_SIGNAL_REALTIME value is in order.  */
+      if (33 <= hostsig && hostsig <= 63)
+	return (enum target_signal)
+	  (hostsig - 33 + (int) TARGET_SIGNAL_REALTIME_33);
+      else if (hostsig == 64)
+	return TARGET_SIGNAL_REALTIME_64;
+      else
+	error ("GDB bug: target.c (target_signal_from_host): unrecognized real-time signal");
+    }
+#endif
+  return TARGET_SIGNAL_UNKNOWN;
+}
+
+/* Convert a OURSIG (an enum target_signal) to the form used by the
+   target operating system (refered to as the ``host'') or zero if the
+   equivalent host signal is not available.  Set/clear OURSIG_OK
+   accordingly. */
+
+static int
+do_target_signal_to_host (enum target_signal oursig,
+			  int *oursig_ok)
+{
+  *oursig_ok = 1;
+  switch (oursig)
+    {
+    case TARGET_SIGNAL_0:
+      return 0;
+
+#if defined (SIGHUP)
+    case TARGET_SIGNAL_HUP:
+      return SIGHUP;
+#endif
+#if defined (SIGINT)
+    case TARGET_SIGNAL_INT:
+      return SIGINT;
+#endif
+#if defined (SIGQUIT)
+    case TARGET_SIGNAL_QUIT:
+      return SIGQUIT;
+#endif
+#if defined (SIGILL)
+    case TARGET_SIGNAL_ILL:
+      return SIGILL;
+#endif
+#if defined (SIGTRAP)
+    case TARGET_SIGNAL_TRAP:
+      return SIGTRAP;
+#endif
+#if defined (SIGABRT)
+    case TARGET_SIGNAL_ABRT:
+      return SIGABRT;
+#endif
+#if defined (SIGEMT)
+    case TARGET_SIGNAL_EMT:
+      return SIGEMT;
+#endif
+#if defined (SIGFPE)
+    case TARGET_SIGNAL_FPE:
+      return SIGFPE;
+#endif
+#if defined (SIGKILL)
+    case TARGET_SIGNAL_KILL:
+      return SIGKILL;
+#endif
+#if defined (SIGBUS)
+    case TARGET_SIGNAL_BUS:
+      return SIGBUS;
+#endif
+#if defined (SIGSEGV)
+    case TARGET_SIGNAL_SEGV:
+      return SIGSEGV;
+#endif
+#if defined (SIGSYS)
+    case TARGET_SIGNAL_SYS:
+      return SIGSYS;
+#endif
+#if defined (SIGPIPE)
+    case TARGET_SIGNAL_PIPE:
+      return SIGPIPE;
+#endif
+#if defined (SIGALRM)
+    case TARGET_SIGNAL_ALRM:
+      return SIGALRM;
+#endif
+#if defined (SIGTERM)
+    case TARGET_SIGNAL_TERM:
+      return SIGTERM;
+#endif
+#if defined (SIGUSR1)
+    case TARGET_SIGNAL_USR1:
+      return SIGUSR1;
+#endif
+#if defined (SIGUSR2)
+    case TARGET_SIGNAL_USR2:
+      return SIGUSR2;
+#endif
+#if defined (SIGCHLD) || defined (SIGCLD)
+    case TARGET_SIGNAL_CHLD:
+#if defined (SIGCHLD)
+      return SIGCHLD;
+#else
+      return SIGCLD;
+#endif
+#endif /* SIGCLD or SIGCHLD */
+#if defined (SIGPWR)
+    case TARGET_SIGNAL_PWR:
+      return SIGPWR;
+#endif
+#if defined (SIGWINCH)
+    case TARGET_SIGNAL_WINCH:
+      return SIGWINCH;
+#endif
+#if defined (SIGURG)
+    case TARGET_SIGNAL_URG:
+      return SIGURG;
+#endif
+#if defined (SIGIO)
+    case TARGET_SIGNAL_IO:
+      return SIGIO;
+#endif
+#if defined (SIGPOLL)
+    case TARGET_SIGNAL_POLL:
+      return SIGPOLL;
+#endif
+#if defined (SIGSTOP)
+    case TARGET_SIGNAL_STOP:
+      return SIGSTOP;
+#endif
+#if defined (SIGTSTP)
+    case TARGET_SIGNAL_TSTP:
+      return SIGTSTP;
+#endif
+#if defined (SIGCONT)
+    case TARGET_SIGNAL_CONT:
+      return SIGCONT;
+#endif
+#if defined (SIGTTIN)
+    case TARGET_SIGNAL_TTIN:
+      return SIGTTIN;
+#endif
+#if defined (SIGTTOU)
+    case TARGET_SIGNAL_TTOU:
+      return SIGTTOU;
+#endif
+#if defined (SIGVTALRM)
+    case TARGET_SIGNAL_VTALRM:
+      return SIGVTALRM;
+#endif
+#if defined (SIGPROF)
+    case TARGET_SIGNAL_PROF:
+      return SIGPROF;
+#endif
+#if defined (SIGXCPU)
+    case TARGET_SIGNAL_XCPU:
+      return SIGXCPU;
+#endif
+#if defined (SIGXFSZ)
+    case TARGET_SIGNAL_XFSZ:
+      return SIGXFSZ;
+#endif
+#if defined (SIGWIND)
+    case TARGET_SIGNAL_WIND:
+      return SIGWIND;
+#endif
+#if defined (SIGPHONE)
+    case TARGET_SIGNAL_PHONE:
+      return SIGPHONE;
+#endif
+#if defined (SIGLOST)
+    case TARGET_SIGNAL_LOST:
+      return SIGLOST;
+#endif
+#if defined (SIGWAITING)
+    case TARGET_SIGNAL_WAITING:
+      return SIGWAITING;
+#endif
+#if defined (SIGCANCEL)
+    case TARGET_SIGNAL_CANCEL:
+      return SIGCANCEL;
+#endif
+#if defined (SIGLWP)
+    case TARGET_SIGNAL_LWP:
+      return SIGLWP;
+#endif
+#if defined (SIGDANGER)
+    case TARGET_SIGNAL_DANGER:
+      return SIGDANGER;
+#endif
+#if defined (SIGGRANT)
+    case TARGET_SIGNAL_GRANT:
+      return SIGGRANT;
+#endif
+#if defined (SIGRETRACT)
+    case TARGET_SIGNAL_RETRACT:
+      return SIGRETRACT;
+#endif
+#if defined (SIGMSG)
+    case TARGET_SIGNAL_MSG:
+      return SIGMSG;
+#endif
+#if defined (SIGSOUND)
+    case TARGET_SIGNAL_SOUND:
+      return SIGSOUND;
+#endif
+#if defined (SIGSAK)
+    case TARGET_SIGNAL_SAK:
+      return SIGSAK;
+#endif
+#if defined (SIGPRIO)
+    case TARGET_SIGNAL_PRIO:
+      return SIGPRIO;
+#endif
+
+      /* Mach exceptions.  Assumes that the values for EXC_ are positive! */
+#if defined (EXC_BAD_ACCESS) && defined (_NSIG)
+    case TARGET_EXC_BAD_ACCESS:
+      return _NSIG + EXC_BAD_ACCESS;
+#endif
+#if defined (EXC_BAD_INSTRUCTION) && defined (_NSIG)
+    case TARGET_EXC_BAD_INSTRUCTION:
+      return _NSIG + EXC_BAD_INSTRUCTION;
+#endif
+#if defined (EXC_ARITHMETIC) && defined (_NSIG)
+    case TARGET_EXC_ARITHMETIC:
+      return _NSIG + EXC_ARITHMETIC;
+#endif
+#if defined (EXC_EMULATION) && defined (_NSIG)
+    case TARGET_EXC_EMULATION:
+      return _NSIG + EXC_EMULATION;
+#endif
+#if defined (EXC_SOFTWARE) && defined (_NSIG)
+    case TARGET_EXC_SOFTWARE:
+      return _NSIG + EXC_SOFTWARE;
+#endif
+#if defined (EXC_BREAKPOINT) && defined (_NSIG)
+    case TARGET_EXC_BREAKPOINT:
+      return _NSIG + EXC_BREAKPOINT;
+#endif
+
+#if defined (SIGINFO)
+    case TARGET_SIGNAL_INFO:
+      return SIGINFO;
+#endif
+
+    default:
+#if defined (REALTIME_LO)
+      if (oursig >= TARGET_SIGNAL_REALTIME_33
+	  && oursig <= TARGET_SIGNAL_REALTIME_63)
+	{
+	  /* This block of signals is continuous, and
+	     TARGET_SIGNAL_REALTIME_33 is 33 by definition.  */
+	  int retsig =
+	    (int) oursig - (int) TARGET_SIGNAL_REALTIME_33 + 33;
+	  if (retsig >= REALTIME_LO && retsig < REALTIME_HI)
+	    return retsig;
+	}
+#if (REALTIME_LO < 33)
+      else if (oursig == TARGET_SIGNAL_REALTIME_32)
+	{
+	  /* TARGET_SIGNAL_REALTIME_32 isn't contiguous with
+	     TARGET_SIGNAL_REALTIME_33.  It is 32 by definition.  */
+	  return 32;
+	}
+#endif
+#if (REALTIME_HI > 64)
+      if (oursig >= TARGET_SIGNAL_REALTIME_64
+	  && oursig <= TARGET_SIGNAL_REALTIME_127)
+	{
+	  /* This block of signals is continuous, and
+	     TARGET_SIGNAL_REALTIME_64 is 64 by definition.  */
+	  int retsig =
+	    (int) oursig - (int) TARGET_SIGNAL_REALTIME_64 + 64;
+	  if (retsig >= REALTIME_LO && retsig < REALTIME_HI)
+	    return retsig;
+	}
+      
+#endif
+#endif
+
+#if defined (SIGRTMIN)
+      if (oursig >= TARGET_SIGNAL_REALTIME_33
+	  && oursig <= TARGET_SIGNAL_REALTIME_63)
+	{
+	  /* This block of signals is continuous, and
+	     TARGET_SIGNAL_REALTIME_33 is 33 by definition.  */
+	  int retsig =
+	    (int) oursig - (int) TARGET_SIGNAL_REALTIME_33 + 33;
+	  if (retsig >= SIGRTMIN && retsig <= SIGRTMAX)
+	    return retsig;
+	}
+      else if (oursig == TARGET_SIGNAL_REALTIME_64)
+	return 64;
+#endif
+      *oursig_ok = 0;
+      return 0;
+    }
+}
+
+int
+target_signal_to_host_p (int oursig)
+{
+  int oursig_ok;
+  do_target_signal_to_host ((enum target_signal) oursig, &oursig_ok);
+  return oursig_ok;
+}
+
+int
+target_signal_to_host (int oursig)
+{
+  int oursig_ok;
+  int targ_signo = do_target_signal_to_host ((enum target_signal) oursig,
+					     &oursig_ok);
+  if (!oursig_ok)
+    return 0;
+  else
+    return targ_signo;
+}


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