New files for DWARF debugging format support, ELF object file support, SVR4

/proc (process file system) support, Amiga UNIX target and host defines, SVR4
target and host defines, and m68k hosts defines.

gdb/tm-amix.h

@@ -0,0 +1,56 @@
+/* Macro definitions for GDB on a Commodore Amiga running SVR4 (amix).
+   Copyright (C) 1991, Free Software Foundation, Inc.
+   Written by Fred Fish at Cygnus Support (fnf@cygint)
+
+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.  */
+
+/* All Amiga's (so far) running UNIX have come standard with the floating
+   point coprocessor. */
+
+#define HAVE_68881	/* Amiga has floating point coprocessor */
+
+/* Sequence of bytes for breakpoint instruction.
+   This is a TRAP instruction.  The last 4 bits (0x1 below) is the
+   vector. */
+
+#define BREAKPOINT {0x4e, 0x41 }	/* Trap using vector 0x1 */
+
+/* How much to decrement the PC after a trap.  Depends on kernel. */
+
+#define DECR_PC_AFTER_BREAK 0		/* No decrement required */
+
+
+#include "tm-68k.h"
+#include "tm-svr4.h"
+
+/* Address of end of stack space. (actually one byte past it).
+   This value is typically very OS dependent.
+   FIXME:  Check to see if SVR4 offers some machine independent way
+   of discovering this value and use it if so, and if we need it. */
+
+/* #define STACK_END_ADDR 0xc0800000 */
+
+/* Use the alternate method of avoiding running up off the end of
+   the frame chain or following frames back into the startup code.
+   See the comments in blockframe.c */
+   
+#undef FRAME_CHAIN_VALID
+#define FRAME_CHAIN_VALID(chain, thisframe)	\
+  (chain != 0 					\
+   && !(inside_main_scope ((thisframe)->pc))	\
+   && !(inside_entry_scope ((thisframe)->pc)))
+