* infrun.c (wait_for_inferior): Don't test for SIGEMT

	(which is not a Posix signal) if it isn't defined.
	* tm-linux.h, xm-linux.h, config/linux.m[ht], configure.in:
	New port to Linux (a free Unix clone for 386 machines).

5 files changed, 100 insertions, 38 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index da68bdd..24f3deb 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@
+Mon Jun 22 17:19:02 1992  Per Bothner  (bothner@cygnus.com)
+
+	* infrun.c (wait_for_inferior):  Don't test for SIGEMT
+	(which is not a Posix signal) if it isn't defined.
+	* tm-linux.h, xm-linux.h, config/linux.m[ht], configure.in:
+	New port to Linux (a free Unix clone for 386 machines).
+
 Sat Jun 20 19:19:52 1992  John Gilmore  (gnu at cygnus.com)
 
 	COFF changes for dealing better with EPI 29K C compiler output.
diff --git a/gdb/configure.in b/gdb/configure.in
index ace1ba0..b53ee77 100644
--- a/gdb/configure.in
+++ b/gdb/configure.in
@@ -108,6 +108,7 @@ i386)
 		sysv*)	gdb_host=i386v ;;
 		scosysv*) gdb_host=i386sco ;;
 		mach)	gdb_host=i386mach ;;
+		linux)	gdb_host=linux ;;
 		esac
 		;;
 	esac
@@ -316,6 +317,7 @@ i386)
 		mach)	gdb_target=i386mach ;;
 		coff)	gdb_target=i386v ;;
 		aout)	gdb_target=i386aout ;;
+		linux)	gdb_target=linux ;;
 		esac
 	esac
 	;;
diff --git a/gdb/infrun.c b/gdb/infrun.c
index 98e7227..e23f501 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -109,7 +109,6 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #include "breakpoint.h"
 #include "wait.h"
 #include "gdbcore.h"
-#include "signame.h"
 #include "command.h"
 #include "terminal.h"		/* For #ifdef TIOCGPGRP and new_tty */
 #include "target.h"
@@ -133,7 +132,7 @@ extern int original_stack_limit;
 /* Prototypes for local functions */
 
 static void
-signals_info PARAMS ((char *));
+signals_info PARAMS ((char *, int));
 
 static void
 handle_command PARAMS ((char *, int));
@@ -158,9 +157,6 @@ resume_cleanups PARAMS ((int));
 
 extern char **environ;
 
-extern int sys_nerr;
-extern char *sys_errlist[];
-
 extern struct target_ops child_ops;	/* In inftarg.c */
 
 /* Sigtramp is a routine that the kernel calls (which then calls the
@@ -215,9 +211,9 @@ extern dc_dcontext_t current_context;
 
 /* Tables of how to react to signals; the user sets them.  */
 
-static char signal_stop[NSIG];
-static char signal_print[NSIG];
-static char signal_program[NSIG];
+static char *signal_stop;
+static char *signal_print;
+static char *signal_program;
 
 /* Nonzero if breakpoints are now inserted in the inferior.  */
 /* Nonstatic for initialization during xxx_create_inferior. FIXME. */
@@ -599,7 +595,7 @@ child_create_inferior (exec_file, allargs, env)
       execlp (shell_file, shell_file, "-c", shell_command, (char *)0);
 
       fprintf (stderr, "Cannot exec %s: %s.\n", shell_file,
-	       errno < sys_nerr ? sys_errlist[errno] : "unknown error");
+	       safe_strerror (errno));
       fflush (stderr);
       _exit (0177);
     }
@@ -735,6 +731,9 @@ child_attach (args, from_tty)
 #else
   pid = atoi (args);
 
+  if (pid == getpid())		/* Trying to masturbate? */
+    error ("I refuse to debug myself!");
+
   if (target_has_execution)
     {
       if (query ("A program is being debugged already.  Kill it? "))
@@ -817,11 +816,11 @@ wait_for_inferior ()
 	{
 	  target_terminal_ours ();	/* Must do this before mourn anyway */
 	  if (WEXITSTATUS (w))
-	    printf ("\nProgram exited with code 0%o.\n", 
+	    printf_filtered ("\nProgram exited with code 0%o.\n", 
 		     (unsigned int)WEXITSTATUS (w));
 	  else
 	    if (!batch_mode())
-	      printf ("\nProgram exited normally.\n");
+	      printf_filtered ("\nProgram exited normally.\n");
 	  fflush (stdout);
 	  target_mourn_inferior ();
 #ifdef NO_SINGLE_STEP
@@ -837,16 +836,13 @@ wait_for_inferior ()
 	  target_terminal_ours ();	/* Must do this before mourn anyway */
 	  target_kill ();		/* kill mourns as well */
 #ifdef PRINT_RANDOM_SIGNAL
-	  printf ("\nProgram terminated: ");
+	  printf_filtered ("\nProgram terminated: ");
 	  PRINT_RANDOM_SIGNAL (stop_signal);
 #else
-	  printf ("\nProgram terminated with signal %d, %s\n",
-		  stop_signal,
-		  stop_signal < NSIG
-		  ? sys_siglist[stop_signal]
-		  : "(undocumented)");
+	  printf_filtered ("\nProgram terminated with signal %d, %s\n",
+			   stop_signal, safe_strsignal (stop_signal));
 #endif
-	  printf ("The inferior process no longer exists.\n");
+	  printf_filtered ("The inferior process no longer exists.\n");
 	  fflush (stdout);
 #ifdef NO_SINGLE_STEP
 	  one_stepped = 0;
@@ -902,7 +898,10 @@ wait_for_inferior ()
       if (stop_signal == SIGTRAP
 	  || (breakpoints_inserted &&
 	      (stop_signal == SIGILL
-	       || stop_signal == SIGEMT))
+#ifdef SIGEMT
+	       || stop_signal == SIGEMT
+#endif
+            ))
 	  || stop_soon_quietly)
 	{
 	  if (stop_signal == SIGTRAP && stop_after_trap)
@@ -1007,11 +1006,8 @@ wait_for_inferior ()
 #ifdef PRINT_RANDOM_SIGNAL
 	      PRINT_RANDOM_SIGNAL (stop_signal);
 #else
-	      printf ("\nProgram received signal %d, %s\n",
-		      stop_signal,
-		      stop_signal < NSIG
-		      ? sys_siglist[stop_signal]
-		      : "(undocumented)");
+	      printf_filtered ("\nProgram received signal %d, %s\n",
+			       stop_signal, safe_strsignal (stop_signal));
 #endif /* PRINT_RANDOM_SIGNAL */
 	      fflush (stdout);
 	    }
@@ -1493,7 +1489,7 @@ normal_stop ()
     {
       target_terminal_ours_for_output ();
       print_sys_errmsg ("ptrace", breakpoints_failed);
-      printf ("Stopped; cannot insert breakpoints.\n\
+      printf_filtered ("Stopped; cannot insert breakpoints.\n\
 The same program may be running in another process.\n");
     }
 
@@ -1504,7 +1500,7 @@ The same program may be running in another process.\n");
     if (remove_breakpoints ())
       {
 	target_terminal_ours_for_output ();
-	printf ("Cannot remove breakpoints because program is no longer writable.\n\
+	printf_filtered ("Cannot remove breakpoints because program is no longer writable.\n\
 It might be running in another process.\n\
 Further execution is probably impossible.\n");
       }
@@ -1614,15 +1610,16 @@ static void
 sig_print_info (number)
      int number;
 {
-  char *abbrev = sig_abbrev(number);
-  if (abbrev == NULL)
+  char *name;
+
+  if ((name = strsigno (number)) == NULL)
     printf_filtered ("%d\t\t", number);
   else
-    printf_filtered ("SIG%s (%d)\t", abbrev, number);
+    printf_filtered ("%s (%d)\t", name, number);
   printf_filtered ("%s\t", signal_stop[number] ? "Yes" : "No");
   printf_filtered ("%s\t", signal_print[number] ? "Yes" : "No");
   printf_filtered ("%s\t\t", signal_program[number] ? "Yes" : "No");
-  printf_filtered ("%s\n", sys_siglist[number]);
+  printf_filtered ("%s\n", safe_strsignal (number));
 }
 
 /* Specify how various signals in the inferior should be handled.  */
@@ -1666,7 +1663,7 @@ handle_command (args, from_tty)
 	    {
 	      /* Numeric.  */
 	      signum = atoi (p);
-	      if (signum <= 0 || signum >= NSIG)
+	      if (signum <= 0 || signum > signo_max ())
 		{
 		  p[wordlen] = '\0';
 		  error ("Invalid signal %s given as argument to \"handle\".", p);
@@ -1675,14 +1672,14 @@ handle_command (args, from_tty)
 	  else
 	    {
 	      /* Symbolic.  */
-	      signum = sig_number (p);
-	      if (signum == -1)
+	      signum = strtosigno (p);
+	      if (signum == 0)
 		error ("No such signal \"%s\"", p);
 	    }
 
 	  if (signum == SIGTRAP || signum == SIGINT)
 	    {
-	      if (!query ("SIG%s is used by the debugger.\nAre you sure you want to change it? ", sig_abbrev (signum)))
+	      if (!query ("%s is used by the debugger.\nAre you sure you want to change it? ", strsigno (signum)))
 		error ("Not confirmed.");
 	    }
 	}
@@ -1734,8 +1731,9 @@ handle_command (args, from_tty)
 /* Print current contents of the tables set by the handle command.  */
 
 static void
-signals_info (signum_exp)
+signals_info (signum_exp, from_tty)
      char *signum_exp;
+     int from_tty;
 {
   register int i;
   sig_print_header ();
@@ -1743,8 +1741,8 @@ signals_info (signum_exp)
   if (signum_exp)
     {
       /* First see if this is a symbol name.  */
-      i = sig_number (signum_exp);
-      if (i == -1)
+      i = strtosigno (signum_exp);
+      if (i == 0)
 	{
 	  /* Nope, maybe it's an address which evaluates to a signal
 	     number.  */
@@ -1872,6 +1870,7 @@ void
 _initialize_infrun ()
 {
   register int i;
+  register int numsigs;
 
   add_info ("signals", signals_info,
 	    "What debugger does when program gets various signals.\n\
@@ -1887,7 +1886,11 @@ Stop means reenter debugger if this signal happens (implies print).\n\
 Pass means let program see this signal; otherwise program doesn't know.\n\
 Pass and Stop may be combined.");
 
-  for (i = 0; i < NSIG; i++)
+  numsigs = signo_max () + 1;
+  signal_stop = xmalloc (sizeof (signal_stop[0]) * numsigs);
+  signal_print = xmalloc (sizeof (signal_print[0]) * numsigs);
+  signal_program = xmalloc (sizeof (signal_program[0]) * numsigs);
+  for (i = 0; i < numsigs; i++)
     {
       signal_stop[i] = 1;
       signal_print[i] = 1;
diff --git a/gdb/tm-linux.h b/gdb/tm-linux.h
new file mode 100644
index 0000000..f36505f
--- /dev/null
+++ b/gdb/tm-linux.h
@@ -0,0 +1,27 @@
+/* Macro definitions for linux.
+   Copyright (C) 1992 Free Software Foundation, Inc.
+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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#if !defined (TM_LINUX_H)
+#define TM_LINUX_H 1
+/* number of traps that happen between exec'ing the shell
+ * to run an inferior, and when we finally get to
+ * the inferior code.  This is 2 on most implementations.
+ */
+#define START_INFERIOR_TRAPS_EXPECTED 2
+#include "tm-i386v.h"
+/* Define this if the C compiler puts an underscore at the front
+   of external names before giving them to the linker.  */
+#define NAMES_HAVE_UNDERSCORE
+#endif		/* !defined (TM_LINUX_H) */
diff --git a/gdb/xm-linux.h b/gdb/xm-linux.h
new file mode 100644
index 0000000..771c3db
--- /dev/null
+++ b/gdb/xm-linux.h
@@ -0,0 +1,23 @@
+/* Macro defintions for linux.
+   Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
+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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "xm-i386v.h"
+/* Tell gdb that we can attach and detach other processes */
+#define ATTACH_DETACH
+/* This is the amount to subtract from u.u_ar0
+   to get the offset in the core file of the register values.  */
+#undef KERNEL_U_ADDR
+#define KERNEL_U_ADDR 0x0
+#define U_REGS_OFFSET 0