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.

9 files changed, 4966 insertions, 0 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 5d6ade0..ab81f0c 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,18 @@
 Thu Oct 24 01:32:51 1991  Fred Fish  (fnf at cygnus.com)
 
+        * dwarfread.c: New file for DWARF debugging format support.
+
+	* elfread.c: New file for ELF object file format support.
+
+	* procfs.c: New file for SVR4 /proc (process file system) support.
+
+	* tm-amix.h, xm-amix.h, tconfig/amix, xconfig/amix: New files for
+	Amiga UNIX support.
+
+	* xm-svr4.h, tm-svr4.h: New files for SVR4 support.
+
+	* xm-m68k.h: New file for host machines with m68k cpu.
+
 	* Makefile.in: Add elfread.c and dwarfread.c to SFILES_MAINDIR.
 	Add elfread.o and dwarfread.o to OBS.
 
diff --git a/gdb/dwarfread.c b/gdb/dwarfread.c
new file mode 100644
index 0000000..6bb6c16
--- /dev/null
+++ b/gdb/dwarfread.c
@@ -0,0 +1,3574 @@
+/* DWARF debugging format support for GDB.
+   Copyright (C) 1991 Free Software Foundation, Inc.
+   Written by Fred Fish at Cygnus Support, portions based on dbxread.c,
+   mipsread.c, coffread.c, and dwarfread.c from a Data General SVR4 gdb port.
+
+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.  */
+
+/*
+
+FIXME: Figure out how to get the frame pointer register number in the
+execution environment of the target.  Remove R_FP kludge
+
+FIXME: Add generation of dependencies list to partial symtab code.
+
+FIXME: Currently we ignore host/target byte ordering and integer size
+differences.  Should remap data from external form to an internal form
+before trying to use it.
+
+FIXME: Resolve minor differences between what information we put in the
+partial symbol table and what dbxread puts in.  For example, we don't yet
+put enum constants there.  And dbxread seems to invent a lot of typedefs
+we never see.  Use the new printpsym command to see the partial symbol table
+contents.
+
+FIXME: Change forward declarations of static functions to allow for compilers
+without prototypes.
+
+FIXME: Figure out a better way to tell gdb (all the debug reading routines)
+the names of the gccX_compiled flags.
+
+FIXME: Figure out a better way to tell gdb about the name of the function
+contain the user's entry point (I.E. main())
+
+FIXME: The current DWARF specification has a very strong bias towards
+machines with 32-bit integers, as it assumes that many attributes of the
+program (such as an address) will fit in such an integer.  There are many
+references in the spec to things that are 2, 4, or 8 bytes long.  Given that
+we will probably run into problems on machines where some of these assumptions
+are invalid (64-bit ints for example), we don't bother at this time to try to
+make this code more flexible and just use shorts, ints, and longs (and their
+sizes) where it seems appropriate.  I.E. we use a short int to hold DWARF
+tags, and assume that the tag size in the file is the same as sizeof(short).
+
+FIXME: Figure out how to get the name of the symbol indicating that a module
+has been compiled with gcc (gcc_compiledXX) in a more portable way than
+hardcoding it into the object file readers.
+
+FIXME: See other FIXME's and "ifdef 0" scattered throughout the code for
+other things to work on, if you get bored. :-)
+
+*/
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <fcntl.h>
+
+#include "defs.h"
+#include "param.h"
+#include "bfd.h"
+#include "symtab.h"
+#include "symfile.h"
+#include "dwarf.h"
+#include "ansidecl.h"
+
+#ifdef MAINTENANCE	/* Define to 1 to compile in some maintenance stuff */
+#define SQUAWK(stuff) dwarfwarn stuff
+#else
+#define SQUAWK(stuff)
+#endif
+
+#ifndef R_FP		/* FIXME */
+#define R_FP 14		/* Kludge to get frame pointer register number */
+#endif
+
+typedef unsigned int DIEREF;	/* Reference to a DIE */
+
+#define GCC_COMPILED_FLAG_SYMBOL "gcc_compiled%"	/* FIXME */
+#define GCC2_COMPILED_FLAG_SYMBOL "gcc2_compiled%"	/* FIXME */
+
+#define STREQ(a,b)		(strcmp(a,b)==0)
+
+extern CORE_ADDR entry_point;		/* Process entry point */
+extern CORE_ADDR startup_file_start;	/* From blockframe.c */
+extern CORE_ADDR startup_file_end;	/* From blockframe.c */
+extern CORE_ADDR entry_scope_lowpc;	/* From blockframe.c */
+extern CORE_ADDR entry_scope_highpc;	/* From blockframc.c */
+extern CORE_ADDR main_scope_lowpc;	/* From blockframe.c */
+extern CORE_ADDR main_scope_highpc;	/* From blockframc.c */
+extern int info_verbose;		/* From main.c; nonzero => verbose */
+
+
+/* The DWARF debugging information consists of two major pieces,
+   one is a block of DWARF Information Entries (DIE's) and the other
+   is a line number table.  The "struct dieinfo" structure contains
+   the information for a single DIE, the one currently being processed.
+
+   In order to make it easier to randomly access the attribute fields
+   of the current DIE, which are specifically unordered within the DIE
+   each DIE is scanned and an instance of the "struct dieinfo"
+   structure is initialized.
+
+   Initialization is done in two levels.  The first, done by basicdieinfo(),
+   just initializes those fields that are vital to deciding whether or not
+   to use this DIE, how to skip past it, etc.  The second, done by the
+   function completedieinfo(), fills in the rest of the information.
+
+   Attributes which have block forms are not interpreted at the time
+   the DIE is scanned, instead we just save pointers to the start
+   of their value fields.
+
+   Some fields have a flag <name>_p that is set when the value of the
+   field is valid (I.E. we found a matching attribute in the DIE).  Since
+   we may want to test for the presence of some attributes in the DIE,
+   such as AT_is_external, without restricting the values of the field,
+   we need someway to note that we found such an attribute.
+   
+ */
+   
+typedef char BLOCK;
+
+struct dieinfo {
+  char *	die;			/* Pointer to the raw DIE data */
+  long		dielength;		/* Length of the raw DIE data */
+  DIEREF	dieref;			/* Offset of this DIE */
+  short		dietag;			/* Tag for this DIE */
+  long		at_padding;
+  long		at_sibling;
+  BLOCK *	at_location;
+  char *	at_name;
+  unsigned short at_fund_type;
+  BLOCK *	at_mod_fund_type;
+  long		at_user_def_type;
+  BLOCK *	at_mod_u_d_type;
+  short		at_ordering;
+  BLOCK *	at_subscr_data;
+  long		at_byte_size;
+  short		at_bit_offset;
+  long		at_bit_size;
+  BLOCK *	at_deriv_list;
+  BLOCK *	at_element_list;
+  long		at_stmt_list;
+  long		at_low_pc;
+  long		at_high_pc;
+  long		at_language;
+  long		at_member;
+  long		at_discr;
+  BLOCK *	at_discr_value;
+  short		at_visibility;
+  long		at_import;
+  BLOCK *	at_string_length;
+  char *	at_comp_dir;
+  char *	at_producer;
+  long		at_loclist;
+  long		at_frame_base;
+  short		at_incomplete;
+  long		at_start_scope;
+  long		at_stride_size;
+  long		at_src_info;
+  short		at_prototyped;
+  BLOCK *	at_const_data;
+  short		at_is_external;
+  unsigned int	at_is_external_p:1;
+  unsigned int	at_stmt_list_p:1;
+};
+
+static int diecount;	/* Approximate count of dies for compilation unit */
+static struct dieinfo *curdie;	/* For warnings and such */
+
+static char *dbbase;	/* Base pointer to dwarf info */
+static int dbroff;	/* Relative offset from start of .debug section */
+static char *lnbase;	/* Base pointer to line section */
+static int isreg;	/* Kludge to identify register variables */
+
+static CORE_ADDR baseaddr;	/* Add to each symbol value */
+
+/* Each partial symbol table entry contains a pointer to private data for the
+   read_symtab() function to use when expanding a partial symbol table entry
+   to a full symbol table entry.  For DWARF debugging info, this data is
+   contained in the following structure and macros are provided for easy
+   access to the members given a pointer to a partial symbol table entry.
+
+   dbfoff	Always the absolute file offset to the start of the ".debug"
+		section for the file containing the DIE's being accessed.
+
+   dbroff	Relative offset from the start of the ".debug" access to the
+		first DIE to be accessed.  When building the partial symbol
+		table, this value will be zero since we are accessing the
+		entire ".debug" section.  When expanding a partial symbol
+		table entry, this value will be the offset to the first
+		DIE for the compilation unit containing the symbol that
+		triggers the expansion.
+
+   dblength	The size of the chunk of DIE's being examined, in bytes.
+
+   lnfoff	The absolute file offset to the line table fragment.  Ignored
+		when building partial symbol tables, but used when expanding
+		them, and contains the absolute file offset to the fragment
+		of the ".line" section containing the line numbers for the
+		current compilation unit.
+ */
+
+struct dwfinfo {
+  int dbfoff;		/* Absolute file offset to start of .debug section */
+  int dbroff;		/* Relative offset from start of .debug section */
+  int dblength;		/* Size of the chunk of DIE's being examined */
+  int lnfoff;		/* Absolute file offset to line table fragment */
+};
+
+#define DBFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbfoff)
+#define DBROFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->dbroff)
+#define DBLENGTH(p) (((struct dwfinfo *)((p)->read_symtab_private))->dblength)
+#define LNFOFF(p) (((struct dwfinfo *)((p)->read_symtab_private))->lnfoff)
+
+/*  Record the symbols defined for each context in a linked list.  We don't
+    create a struct block for the context until we know how long to make it.
+    Global symbols for each file are maintained in the global_symbols list. */
+
+struct pending_symbol {
+  struct pending_symbol *next;		/* Next pending symbol */
+  struct symbol *symbol;		/* The actual symbol */
+};
+
+static struct pending_symbol *global_symbols;	/* global funcs and vars */
+static struct block *global_symbol_block;
+
+/*  Line number entries are read into a dynamically expandable vector before
+    being added to the symbol table section.  Once we know how many there are
+    we can add them. */
+
+static struct linetable *line_vector;	/* Vector of line numbers. */
+static int line_vector_index;		/* Index of next entry.  */
+static int line_vector_length;		/* Current allocation limit */
+
+/* Scope information is kept in a scope tree, one node per scope.  Each time
+   a new scope is started, a child node is created under the current node
+   and set to the current scope.  Each time a scope is closed, the current
+   scope moves back up the tree to the parent of the current scope.
+
+   Each scope contains a pointer to the list of symbols defined in the scope,
+   a pointer to the block vector for the scope, a pointer to the symbol
+   that names the scope (if any), and the range of PC values that mark
+   the start and end of the scope.  */
+
+struct scopenode {
+    struct scopenode *parent;
+    struct scopenode *child;
+    struct scopenode *sibling;
+    struct pending_symbol *symbols;
+    struct block *block;
+    struct symbol *namesym;
+    CORE_ADDR lowpc;
+    CORE_ADDR highpc;
+};
+
+static struct scopenode *scopetree;
+static struct scopenode *scope;
+
+/* DIES which have user defined types or modified user defined types refer to
+   other DIES for the type information.  Thus we need to associate the offset
+   of a DIE for a user defined type with a pointer to the type information.
+
+   Originally this was done using a simple but expensive algorithm, with an
+   array of unsorted structures, each containing an offset/type-pointer pair.
+   This array was scanned linearly each time a lookup was done.  The result
+   was that gdb was spending over half it's startup time munging through this
+   array of pointers looking for a structure that had the right offset member.
+
+   The second attempt used the same array of structures, but the array was
+   sorted using qsort each time a new offset/type was recorded, and a binary
+   search was used to find the type pointer for a given DIE offset.  This was
+   even slower, due to the overhead of sorting the array each time a new
+   offset/type pair was entered.
+
+   The third attempt uses a fixed size array of type pointers, indexed by a
+   value derived from the DIE offset.  Since the minimum DIE size is 4 bytes,
+   we can divide any DIE offset by 4 to obtain a unique index into this fixed
+   size array.  Since each element is a 4 byte pointer, it takes exactly as
+   much memory to hold this array as to hold the DWARF info for a given
+   compilation unit.  But it gets freed as soon as we are done with it. */
+
+static struct type **utypes;	/* Pointer to array of user type pointers */
+static int numutypes;		/* Max number of user type pointers */
+
+/* Forward declarations of static functions so we don't have to worry
+   about ordering within this file.  The EXFUN macro may be slightly
+   misleading.  Should probably be called DCLFUN instead, or something
+   more intuitive, since it can be used for both static and external
+   definitions. */
+
+static void
+EXFUN (dwarfwarn, (char *fmt DOTS));
+
+static void
+EXFUN (scan_partial_symbols, (char *thisdie AND char *enddie));
+
+static void
+EXFUN (scan_compilation_units,
+       (char *filename AND CORE_ADDR addr AND char *thisdie AND char *enddie
+	AND unsigned int dbfoff AND unsigned int lnoffset));
+
+static struct partial_symtab *
+EXFUN(start_psymtab, (char *symfile_name AND CORE_ADDR addr
+		      AND char *filename AND CORE_ADDR textlow
+		      AND CORE_ADDR texthigh AND int dbfoff
+		      AND int curoff AND int culength AND int lnfoff
+		      AND struct partial_symbol *global_syms
+		      AND struct partial_symbol *static_syms));
+static void
+EXFUN(add_partial_symbol, (struct dieinfo *dip));
+
+static void
+EXFUN(add_psymbol_to_list,
+      (struct psymbol_allocation_list *listp AND char *name
+      AND enum namespace space AND enum address_class class
+      AND CORE_ADDR value));
+
+static void
+EXFUN(init_psymbol_list, (int total_symbols));
+
+static void
+EXFUN(basicdieinfo, (struct dieinfo *dip AND char *diep));
+
+static void
+EXFUN(completedieinfo, (struct dieinfo *dip));
+
+static void
+EXFUN(dwarf_psymtab_to_symtab, (struct partial_symtab *pst));
+
+static void
+EXFUN(psymtab_to_symtab_1, (struct partial_symtab *pst AND int desc ));
+
+static struct symtab *
+EXFUN(read_ofile_symtab, (struct partial_symtab *pst AND int desc));
+
+static void
+EXFUN(process_dies, (char *thisdie AND char *enddie));
+
+static void
+EXFUN(read_lexical_block_scope,
+      (struct dieinfo *dip AND char *thisdie AND char *enddie));
+
+static void
+EXFUN(read_structure_scope,
+     (struct dieinfo *dip AND char *thisdie AND char *enddie));
+
+static struct type *
+EXFUN(decode_array_element_type, (char *scan AND char *end));
+
+static struct type *
+EXFUN(decode_subscr_data, (char *scan AND char *end));
+
+static void
+EXFUN(read_array_type, (struct dieinfo *dip));
+
+static void
+EXFUN(read_subroutine_type,
+     (struct dieinfo *dip AND char *thisdie AND char *enddie));
+
+static void
+EXFUN(read_enumeration,
+     (struct dieinfo *dip AND char *thisdie AND char *enddie));
+
+static struct type *
+EXFUN(struct_type,
+      (struct dieinfo *dip AND char *thisdie AND char *enddie));
+
+static struct type *
+EXFUN(enum_type, (struct dieinfo *dip));
+
+static void
+EXFUN(read_func_scope,
+      (struct dieinfo *dip AND char *thisdie AND char *enddie));
+
+static void
+EXFUN(read_file_scope,
+      (struct dieinfo *dip AND char *thisdie AND char *enddie));
+
+static void
+EXFUN(start_symtab, (void));
+
+static void
+EXFUN(end_symtab, (char *filename AND long language));
+
+static int
+EXFUN(scopecount, (struct scopenode *node));
+
+static void
+EXFUN(openscope,
+      (struct symbol *namesym AND CORE_ADDR lowpc AND CORE_ADDR highpc));
+
+static void
+EXFUN(freescope, (struct scopenode *node));
+
+static struct block *
+EXFUN(buildblock, (struct pending_symbol *syms));
+
+static void
+EXFUN(closescope, (void));
+
+static void
+EXFUN(record_line, (int line AND CORE_ADDR pc));
+
+static void
+EXFUN(decode_line_numbers, (char *linetable));
+
+static struct type *
+EXFUN(decode_die_type, (struct dieinfo *dip));
+
+static struct type *
+EXFUN(decode_mod_fund_type, (char *typedata));
+
+static struct type *
+EXFUN(decode_mod_u_d_type, (char *typedata));
+
+static struct type *
+EXFUN(decode_modified_type,
+      (unsigned char *modifiers AND unsigned short modcount AND int mtype));
+
+static struct type *
+EXFUN(decode_fund_type, (unsigned short fundtype));
+
+static char *
+EXFUN(create_name, (char *name AND struct obstack *obstackp));
+
+static void
+EXFUN(add_symbol_to_list,
+      (struct symbol *symbol AND struct pending_symbol **listhead));
+
+static struct block **
+EXFUN(gatherblocks, (struct block **dest AND struct scopenode *node));
+
+static struct blockvector *
+EXFUN(make_blockvector, (void));
+
+static struct type *
+EXFUN(lookup_utype, (DIEREF dieref));
+
+static struct type *
+EXFUN(alloc_utype, (DIEREF dieref AND struct type *usetype));
+
+static struct symbol *
+EXFUN(new_symbol, (struct dieinfo *dip));
+
+static int
+EXFUN(locval, (char *loc));
+
+static void
+EXFUN(record_misc_function, (char *name AND CORE_ADDR address));
+
+static int
+EXFUN(compare_psymbols,
+      (struct partial_symbol *s1 AND struct partial_symbol *s2));
+
+
+/*
+
+GLOBAL FUNCTION
+
+	dwarf_build_psymtabs -- build partial symtabs from DWARF debug info
+
+SYNOPSIS
+
+	void dwarf_build_psymtabs (int desc, char *filename, CORE_ADDR addr,
+	     int mainline, unsigned int dbfoff, unsigned int dbsize,
+	     unsigned int lnoffset, unsigned int lnsize)
+
+DESCRIPTION
+
+	This function is called upon to build partial symtabs from files
+	containing DIE's (Dwarf Information Entries) and DWARF line numbers.
+
+	It is passed a file descriptor for an open file containing the DIES
+	and line number information, the corresponding filename for that
+	file, a base address for relocating the symbols, a flag indicating
+	whether or not this debugging information is from a "main symbol
+	table" rather than a shared library or dynamically linked file,
+	and file offset/size pairs for the DIE information and line number
+	information.
+
+RETURNS
+
+	No return value.
+
+ */
+
+void
+DEFUN(dwarf_build_psymtabs,
+      (desc, filename, addr, mainline, dbfoff, dbsize, lnoffset, lnsize),
+      int desc AND
+      char *filename AND
+      CORE_ADDR addr AND
+      int mainline AND
+      unsigned int dbfoff AND
+      unsigned int dbsize AND
+      unsigned int lnoffset AND
+      unsigned int lnsize)
+{
+  struct cleanup *back_to;
+  
+  dbbase = xmalloc (dbsize);
+  dbroff = 0;
+  if ((lseek (desc, dbfoff, 0) != dbfoff) ||
+      (read (desc, dbbase, dbsize) != dbsize))
+    {
+      free (dbbase);
+      error ("can't read DWARF data from '%s'", filename);
+    }
+  back_to = make_cleanup (free, dbbase);
+  
+  /* If we are reinitializing, or if we have never loaded syms yet, init.
+     Since we have no idea how many DIES we are looking at, we just guess
+     some arbitrary value. */
+  
+  if (mainline || global_psymbols.size == 0 || static_psymbols.size == 0)
+    {
+      init_psymbol_list (1024);
+    }
+  
+  init_misc_bunches ();
+  make_cleanup (discard_misc_bunches, 0);
+  
+  /* Follow the compilation unit sibling chain, building a partial symbol
+     table entry for each one.  Save enough information about each compilation
+     unit to locate the full DWARF information later. */
+  
+  scan_compilation_units (filename, addr, dbbase, dbbase + dbsize,
+			  dbfoff, lnoffset);
+  
+  /* Go over the miscellaneous functions and install them in the miscellaneous
+     function vector. */
+  
+  condense_misc_bunches (!mainline);
+  do_cleanups (back_to);
+}
+
+
+/*
+
+LOCAL FUNCTION
+
+	record_misc_function -- add entry to miscellaneous function vector
+
+SYNOPSIS
+
+	static void record_misc_function (char *name, CORE_ADDR address)
+
+DESCRIPTION
+
+	Given a pointer to the name of a symbol that should be added to the
+	miscellaneous function vector, and the address associated with that
+	symbol, records this information for later use in building the
+	miscellaneous function vector.
+
+NOTES
+
+	FIXME:  For now we just use mf_text as the type.  This should be
+	fixed.
+ */
+
+static void
+DEFUN(record_misc_function, (name, address), char *name AND CORE_ADDR address)
+{
+  prim_record_misc_function (obsavestring (name, strlen (name)), address,
+			     mf_text);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	dwarfwarn -- issue a DWARF related warning
+
+DESCRIPTION
+
+	Issue warnings about DWARF related things that aren't serious enough
+	to warrant aborting with an error, but should not be ignored either.
+	This includes things like detectable corruption in DIE's, missing
+	DIE's, unimplemented features, etc.
+
+	In general, running across tags or attributes that we don't recognize
+	is not considered to be a problem and we should not issue warnings
+	about such.
+
+NOTES
+
+	We mostly follow the example of the error() routine, but without
+	returning to command level.  It is arguable about whether warnings
+	should be issued at all, and if so, where they should go (stdout or
+	stderr).
+
+	We assume that curdie is valid and contains at least the basic
+	information for the DIE where the problem was noticed.
+*/
+
+static void
+DEFUN(dwarfwarn, (fmt), char *fmt DOTS)
+{
+  va_list ap;
+  
+  va_start (ap, fmt);
+  warning_setup ();
+  fprintf (stderr, "DWARF warning (ref 0x%x): ", curdie -> dieref);
+  if (curdie -> at_name)
+    {
+      fprintf (stderr, "'%s': ", curdie -> at_name);
+    }
+  vfprintf (stderr, fmt, ap);
+  fprintf (stderr, "\n");
+  fflush (stderr);
+  va_end (ap);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	compare_psymbols -- compare two partial symbols by name
+
+DESCRIPTION
+
+	Given pointer to two partial symbol table entries, compare
+	them by name and return -N, 0, or +N (ala strcmp).  Typically
+	used by sorting routines like qsort().
+
+NOTES
+
+	This is a copy from dbxread.c.  It should be moved to a generic
+	gdb file and made available for all psymtab builders (FIXME).
+
+	Does direct compare of first two characters before punting
+	and passing to strcmp for longer compares.  Note that the
+	original version had a bug whereby two null strings or two
+	identically named one character strings would return the
+	comparison of memory following the null byte.
+
+ */
+
+static int
+DEFUN(compare_psymbols, (s1, s2), 
+      struct partial_symbol *s1 AND
+      struct partial_symbol *s2)
+{
+  register char *st1 = SYMBOL_NAME (s1);
+  register char *st2 = SYMBOL_NAME (s2);
+
+  if ((st1[0] - st2[0]) || !st1[0])
+    {
+      return (st1[0] - st2[0]);
+    }
+  else if ((st1[1] - st2[1]) || !st1[1])
+    {
+      return (st1[1] - st2[1]);
+    }
+  else
+    {
+      return (strcmp (st1 + 2, st2 + 2));
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	read_lexical_block_scope -- process all dies in a lexical block
+
+SYNOPSIS
+
+	static void read_lexical_block_scope (struct dieinfo *dip,
+		char *thisdie, char *enddie)
+
+DESCRIPTION
+
+	Process all the DIES contained within a lexical block scope.
+	Start a new scope, process the dies, and then close the scope.
+
+ */
+
+static void
+DEFUN(read_lexical_block_scope, (dip, thisdie, enddie),
+     struct dieinfo *dip AND
+     char *thisdie AND
+     char *enddie)
+{
+  openscope (NULL, dip -> at_low_pc, dip -> at_high_pc);
+  process_dies (thisdie + dip -> dielength, enddie);
+  closescope ();
+}
+
+/*
+
+LOCAL FUNCTION
+
+	lookup_utype -- look up a user defined type from die reference
+
+SYNOPSIS
+
+	static type *lookup_utype (DIEREF dieref)
+
+DESCRIPTION
+
+	Given a DIE reference, lookup the user defined type associated with
+	that DIE, if it has been registered already.  If not registered, then
+	return NULL.  Alloc_utype() can be called to register an empty
+	type for this reference, which will be filled in later when the
+	actual referenced DIE is processed.
+ */
+
+static struct type *
+DEFUN(lookup_utype, (dieref), DIEREF dieref)
+{
+  struct type *type = NULL;
+  int utypeidx;
+  
+  utypeidx = (dieref - dbroff) / 4;
+  if ((utypeidx < 0) || (utypeidx >= numutypes))
+    {
+      dwarfwarn ("reference to DIE (0x%x) outside compilation unit", dieref);
+    }
+  else
+    {
+      type = *(utypes + utypeidx);
+    }
+  return (type);
+}
+
+
+/*
+
+LOCAL FUNCTION
+
+	alloc_utype  -- add a user defined type for die reference
+
+SYNOPSIS
+
+	static type *alloc_utype (DIEREF dieref, struct type *utypep)
+
+DESCRIPTION
+
+	Given a die reference DIEREF, and a possible pointer to a user
+	defined type UTYPEP, register that this reference has a user
+	defined type and either use the specified type in UTYPEP or
+	make a new empty type that will be filled in later.
+
+	We should only be called after calling lookup_utype() to verify that
+	there is not currently a type registered for DIEREF.
+ */
+
+static struct type *
+DEFUN(alloc_utype, (dieref, utypep),
+     DIEREF dieref AND
+     struct type *utypep)
+{
+  struct type **typep;
+  int utypeidx;
+  
+  utypeidx = (dieref - dbroff) / 4;
+  typep = utypes + utypeidx;
+  if ((utypeidx < 0) || (utypeidx >= numutypes))
+    {
+      utypep = builtin_type_int;
+      dwarfwarn ("reference to DIE (0x%x) outside compilation unit", dieref);
+    }
+  else if (*typep != NULL)
+    {
+      utypep = *typep;
+      SQUAWK (("internal error: dup user type allocation"));
+    }
+  else
+    {
+      if (utypep == NULL)
+	{
+	  utypep = (struct type *)
+	    obstack_alloc (symbol_obstack, sizeof (struct type));
+	  (void) memset (utypep, 0, sizeof (struct type));
+	}
+      *typep = utypep;
+    }
+  return (utypep);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	decode_die_type -- return a type for a specified die
+
+SYNOPSIS
+
+	static struct type *decode_die_type (struct dieinfo *dip)
+
+DESCRIPTION
+
+	Given a pointer to a die information structure DIP, decode the
+	type of the die and return a pointer to the decoded type.  All
+	dies without specific types default to type int.
+ */
+
+static struct type *
+DEFUN(decode_die_type, (dip), struct dieinfo *dip)
+{
+  struct type *type = NULL;
+  
+  if (dip -> at_fund_type != 0)
+    {
+      type = decode_fund_type (dip -> at_fund_type);
+    }
+  else if (dip -> at_mod_fund_type != NULL)
+    {
+      type = decode_mod_fund_type (dip -> at_mod_fund_type);
+    }
+  else if (dip -> at_user_def_type)
+    {
+      if ((type = lookup_utype (dip -> at_user_def_type)) == NULL)
+	{
+	  type = alloc_utype (dip -> at_user_def_type, NULL);
+	}
+    }
+  else if (dip -> at_mod_u_d_type)
+    {
+      type = decode_mod_u_d_type (dip -> at_mod_u_d_type);
+    }
+  else
+    {
+      type = builtin_type_int;
+    }
+  return (type);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	struct_type -- compute and return the type for a struct or union
+
+SYNOPSIS
+
+	static struct type *struct_type (struct dieinfo *dip, char *thisdie,
+	    char *enddie)
+
+DESCRIPTION
+
+	Given pointer to a die information structure for a die which
+	defines a union or structure, and pointers to the raw die data
+	that define the range of dies which define the members, compute
+	and return the user defined type for the structure or union.
+ */
+
+static struct type *
+DEFUN(struct_type, (dip, thisdie, enddie),
+     struct dieinfo *dip AND
+     char *thisdie AND
+     char *enddie)
+{
+  struct type *type;
+  struct nextfield {
+    struct nextfield *next;
+    struct field field;
+  };
+  struct nextfield *list = NULL;
+  struct nextfield *new;
+  int nfields = 0;
+  int n;
+  char *tpart1;
+  char *tpart2;
+  char *tpart3;
+  struct dieinfo mbr;
+  
+  if ((type = lookup_utype (dip -> dieref)) == NULL)
+    {
+      type = alloc_utype (dip -> dieref, NULL);
+    }
+  switch (dip -> dietag)
+    {
+    case TAG_structure_type:
+      TYPE_CODE (type) = TYPE_CODE_STRUCT;
+      tpart1 = "struct ";
+      break;
+    case TAG_union_type:
+      TYPE_CODE (type) = TYPE_CODE_UNION;
+      tpart1 = "union ";
+      break;
+    default:
+      tpart1 = "";
+      SQUAWK (("missing structure or union tag"));
+      TYPE_CODE (type) = TYPE_CODE_UNDEF;
+      break;
+    }
+  if (dip -> at_name == NULL)
+    {
+      tpart2 = "{...}";
+    }
+  else
+    {
+      tpart2 = dip -> at_name;
+    }
+  if (dip -> at_byte_size == 0)
+    {
+      tpart3 = " <opaque>";
+    } else {
+      TYPE_LENGTH (type) = dip -> at_byte_size;
+      tpart3 = "";
+    }
+  TYPE_NAME (type) = concat (tpart1, tpart2, tpart3);
+  thisdie += dip -> dielength;
+  while (thisdie < enddie)
+    {
+      basicdieinfo (&mbr, thisdie);
+      completedieinfo (&mbr);
+      if (mbr.dielength <= sizeof (long))
+	{
+	  break;
+	}
+      switch (mbr.dietag)
+	{
+	case TAG_member:
+	  /* Get space to record the next field's data.  */
+	  new = (struct nextfield *) alloca (sizeof (struct nextfield));
+	  new -> next = list;
+	  list = new;
+	  /* Save the data.  */
+	  list -> field.name = savestring (mbr.at_name, strlen (mbr.at_name));
+	  list -> field.type = decode_die_type (&mbr);
+	  list -> field.bitpos = 8 * locval (mbr.at_location);
+	  list -> field.bitsize = 0;
+	  nfields++;
+	  break;
+	default:
+	  SQUAWK (("bad member of '%s'", TYPE_NAME (type)));
+	  break;
+	}
+      thisdie += mbr.dielength;
+    }
+  /* Now create the vector of fields, and record how big it is.  */
+  TYPE_NFIELDS (type) = nfields;
+  TYPE_FIELDS (type) = (struct field *)
+    obstack_alloc (symbol_obstack, sizeof (struct field) * nfields);
+  /* Copy the saved-up fields into the field vector.  */
+  for (n = nfields; list; list = list -> next)
+    {
+      TYPE_FIELD (type, --n) = list -> field;
+    }	
+  return (type);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	read_structure_scope -- process all dies within struct or union
+
+SYNOPSIS
+
+	static void read_structure_scope (struct dieinfo *dip,
+		char *thisdie, char *enddie)
+
+DESCRIPTION
+
+	Called when we find the DIE that starts a structure or union
+	scope (definition) to process all dies that define the members
+	of the structure or union.  DIP is a pointer to the die info
+	struct for the DIE that names the structure or union.
+
+NOTES
+
+	Note that we need to call struct_type regardless of whether or not
+	we have a symbol, since we might have a structure or union without
+	a tag name (thus no symbol for the tagname).
+ */
+
+static void
+DEFUN(read_structure_scope, (dip, thisdie, enddie),
+     struct dieinfo *dip AND
+     char *thisdie AND
+     char *enddie)
+{
+  struct type *type;
+  struct symbol *sym;
+  
+  type = struct_type (dip, thisdie, enddie);
+  if ((sym = new_symbol (dip)) != NULL)
+    {
+      SYMBOL_TYPE (sym) = type;
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	decode_array_element_type -- decode type of the array elements
+
+SYNOPSIS
+
+	static struct type *decode_array_element_type (char *scan, char *end)
+
+DESCRIPTION
+
+	As the last step in decoding the array subscript information for an
+	array DIE, we need to decode the type of the array elements.  We are
+	passed a pointer to this last part of the subscript information and
+	must return the appropriate type.  If the type attribute is not
+	recognized, just warn about the problem and return type int.
+ */
+
+static struct type *
+DEFUN(decode_array_element_type, (scan, end), char *scan AND char *end)
+{
+  struct type *typep;
+  short attribute;
+  DIEREF dieref;
+  unsigned short fundtype;
+  
+  (void) memcpy (&attribute, scan, sizeof (short));
+  scan += sizeof (short);
+  switch (attribute)
+    {
+    case AT_fund_type:
+      (void) memcpy (&fundtype, scan, sizeof (short));
+      typep = decode_fund_type (fundtype);
+      break;
+    case AT_mod_fund_type:
+      typep = decode_mod_fund_type (scan);
+      break;
+    case AT_user_def_type:
+      (void) memcpy (&dieref, scan, sizeof (DIEREF));
+      if ((typep = lookup_utype (dieref)) == NULL)
+	{
+	  typep = alloc_utype (dieref, NULL);
+	}
+      break;
+    case AT_mod_u_d_type:
+      typep = decode_mod_u_d_type (scan);
+      break;
+    default:
+      SQUAWK (("bad array element type attribute 0x%x", attribute));
+      typep = builtin_type_int;
+      break;
+    }
+  return (typep);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	decode_subscr_data -- decode array subscript and element type data
+
+SYNOPSIS
+
+	static struct type *decode_subscr_data (char *scan, char *end)
+
+DESCRIPTION
+
+	The array subscripts and the data type of the elements of an
+	array are described by a list of data items, stored as a block
+	of contiguous bytes.  There is a data item describing each array
+	dimension, and a final data item describing the element type.
+	The data items are ordered the same as their appearance in the
+	source (I.E. leftmost dimension first, next to leftmost second,
+	etc).
+
+	We are passed a pointer to the start of the block of bytes
+	containing the data items, and a pointer to the first byte past
+	the data.  This function decodes the data and returns a type.
+
+BUGS
+	FIXME:  This code only implements the forms currently used
+	by the AT&T and GNU C compilers.
+
+	The end pointer is supplied for error checking, maybe we should
+	use it for that...
+ */
+
+static struct type *
+DEFUN(decode_subscr_data, (scan, end), char *scan AND char *end)
+{
+  struct type *typep = NULL;
+  struct type *nexttype;
+  int format;
+  short fundtype;
+  long lowbound;
+  long highbound;
+  
+  format = *scan++;
+  switch (format)
+    {
+    case FMT_ET:
+      typep = decode_array_element_type (scan, end);
+      break;
+    case FMT_FT_C_C:
+      (void) memcpy (&fundtype, scan, sizeof (short));
+      scan += sizeof (short);
+      if (fundtype != FT_integer && fundtype != FT_signed_integer
+	  && fundtype != FT_unsigned_integer)
+	{
+	  SQUAWK (("array subscripts must be integral types, not type 0x%x",
+		     fundtype));
+	}
+      else
+	{
+	  (void) memcpy (&lowbound, scan, sizeof (long));
+	  scan += sizeof (long);
+	  (void) memcpy (&highbound, scan, sizeof (long));
+	  scan += sizeof (long);
+	  nexttype = decode_subscr_data (scan, end);
+	  if (nexttype != NULL)
+	    {
+	      typep = (struct type *)
+		obstack_alloc (symbol_obstack, sizeof (struct type));
+	      (void) memset (typep, 0, sizeof (struct type));
+	      TYPE_CODE (typep) = TYPE_CODE_ARRAY;
+	      TYPE_LENGTH (typep) = TYPE_LENGTH (nexttype);
+	      TYPE_LENGTH (typep) *= lowbound + highbound + 1;
+	      TYPE_TARGET_TYPE (typep) = nexttype;
+	    }		    
+	}
+      break;
+    case FMT_FT_C_X:
+    case FMT_FT_X_C:
+    case FMT_FT_X_X:
+    case FMT_UT_C_C:
+    case FMT_UT_C_X:
+    case FMT_UT_X_C:
+    case FMT_UT_X_X:
+      SQUAWK (("array subscript format 0x%x not handled yet", format));
+      break;
+    default:
+      SQUAWK (("unknown array subscript format %x", format));
+      break;
+    }
+  return (typep);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	read_array_type -- read TAG_array_type DIE
+
+SYNOPSIS
+
+	static void read_array_type (struct dieinfo *dip)
+
+DESCRIPTION
+
+	Extract all information from a TAG_array_type DIE and add to
+	the user defined type vector.
+ */
+
+static void
+DEFUN(read_array_type, (dip), struct dieinfo *dip)
+{
+  struct type *type;
+  char *sub;
+  char *subend;
+  short temp;
+  
+  if (dip -> at_ordering != ORD_row_major)
+    {
+      /* FIXME:  Can gdb even handle column major arrays? */
+      SQUAWK (("array not row major; not handled correctly"));
+    }
+  if ((sub = dip -> at_subscr_data) != NULL)
+    {
+      (void) memcpy (&temp, sub, sizeof (short));
+      subend = sub + sizeof (short) + temp;
+      sub += sizeof (short);
+      type = decode_subscr_data (sub, subend);
+      if (type == NULL)
+	{
+	  type = alloc_utype (dip -> dieref, NULL);
+	  TYPE_CODE (type) = TYPE_CODE_ARRAY;
+	  TYPE_TARGET_TYPE (type) = builtin_type_int;
+	  TYPE_LENGTH (type) = 1 * TYPE_LENGTH (TYPE_TARGET_TYPE (type));
+	}
+      else
+	{
+	  type = alloc_utype (dip -> dieref, type);
+	}
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	read_subroutine_type -- process TAG_subroutine_type dies
+
+SYNOPSIS
+
+	static void read_subroutine_type (struct dieinfo *dip, char thisdie,
+		char *enddie)
+
+DESCRIPTION
+
+	Handle DIES due to C code like:
+
+	struct foo {
+	    int (*funcp)(int a, long l);  (Generates TAG_subroutine_type DIE)
+	    int b;
+	};
+
+NOTES
+
+	The parameter DIES are currently ignored.  See if gdb has a way to
+	include this info in it's type system, and decode them if so.  Is
+	this what the type structure's "arg_types" field is for?  (FIXME)
+ */
+
+static void
+DEFUN(read_subroutine_type, (dip, thisdie, enddie),
+     struct dieinfo *dip AND
+     char *thisdie AND
+     char *enddie)
+{
+  struct type *type;
+  
+  type = decode_die_type (dip);
+  type = lookup_function_type (type);
+  type = alloc_utype (dip -> dieref, type);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	read_enumeration -- process dies which define an enumeration
+
+SYNOPSIS
+
+	static void read_enumeration (struct dieinfo *dip, char *thisdie,
+		char *enddie)
+
+DESCRIPTION
+
+	Given a pointer to a die which begins an enumeration, process all
+	the dies that define the members of the enumeration.
+
+NOTES
+
+	Note that we need to call enum_type regardless of whether or not we
+	have a symbol, since we might have an enum without a tag name (thus
+	no symbol for the tagname).
+ */
+
+static void
+DEFUN(read_enumeration, (dip, thisdie, enddie),
+     struct dieinfo *dip AND
+     char *thisdie AND
+     char *enddie)
+{
+  struct type *type;
+  struct symbol *sym;
+  
+  type = enum_type (dip);
+  if ((sym = new_symbol (dip)) != NULL)
+    {
+      SYMBOL_TYPE (sym) = type;
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	enum_type -- decode and return a type for an enumeration
+
+SYNOPSIS
+
+	static type *enum_type (struct dieinfo *dip)
+
+DESCRIPTION
+
+	Given a pointer to a die information structure for the die which
+	starts an enumeration, process all the dies that define the members
+	of the enumeration and return a type pointer for the enumeration.
+ */
+
+static struct type *
+DEFUN(enum_type, (dip), struct dieinfo *dip)
+{
+  struct type *type;
+  struct nextfield {
+    struct nextfield *next;
+    struct field field;
+  };
+  struct nextfield *list = NULL;
+  struct nextfield *new;
+  int nfields = 0;
+  int n;
+  char *tpart1;
+  char *tpart2;
+  char *tpart3;
+  char *scan;
+  char *listend;
+  long temp;
+  
+  if ((type = lookup_utype (dip -> dieref)) == NULL)
+    {
+      type = alloc_utype (dip -> dieref, NULL);
+    }
+  TYPE_CODE (type) = TYPE_CODE_ENUM;
+  tpart1 = "enum ";
+  if (dip -> at_name == NULL)
+    {
+      tpart2 = "{...}";
+    } else {
+      tpart2 = dip -> at_name;
+    }
+  if (dip -> at_byte_size == 0)
+    {
+      tpart3 = " <opaque>";
+    }
+  else
+    {
+      TYPE_LENGTH (type) = dip -> at_byte_size;
+      tpart3 = "";
+    }
+  TYPE_NAME (type) = concat (tpart1, tpart2, tpart3);
+  if ((scan = dip -> at_element_list) != NULL)
+    {
+      (void) memcpy (&temp, scan, sizeof (temp));
+      listend = scan + temp + sizeof (temp);
+      scan += sizeof (temp);
+      while (scan < listend)
+	{
+	  new = (struct nextfield *) alloca (sizeof (struct nextfield));
+	  new -> next = list;
+	  list = new;
+	  list -> field.type = NULL;
+	  list -> field.bitsize = 0;
+	  (void) memcpy (&list -> field.bitpos, scan, sizeof (long));
+	  scan += sizeof (long);
+	  list -> field.name = savestring (scan, strlen (scan));
+	  scan += strlen (scan) + 1;
+	  nfields++;
+	}
+    }
+  /* Now create the vector of fields, and record how big it is.  */
+  TYPE_NFIELDS (type) = nfields;
+  TYPE_FIELDS (type) = (struct field *)
+    obstack_alloc (symbol_obstack, sizeof (struct field) * nfields);
+  /* Copy the saved-up fields into the field vector.  */
+  for (n = nfields; list; list = list -> next)
+    {
+      TYPE_FIELD (type, --n) = list -> field;
+    }	
+  return (type);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	read_func_scope -- process all dies within a function scope
+
+SYNOPSIS
+
+	static void read_func_scope (struct dieinfo dip, char *thisdie,
+	    char *enddie)
+
+DESCRIPTION
+
+	Process all dies within a given function scope.  We are passed
+	a die information structure pointer DIP for the die which
+	starts the function scope, and pointers into the raw die data
+	that define the dies within the function scope.
+
+	For now, we ignore lexical block scopes within the function.
+	The problem is that AT&T cc does not define a DWARF lexical
+	block scope for the function itself, while gcc defines a
+	lexical block scope for the function.  We need to think about
+	how to handle this difference, or if it is even a problem.
+	(FIXME)
+ */
+
+static void
+DEFUN(read_func_scope, (dip, thisdie, enddie),
+     struct dieinfo *dip AND
+     char *thisdie AND
+     char *enddie)
+{
+  struct symbol *sym;
+  
+  if (entry_point >= dip -> at_low_pc && entry_point < dip -> at_high_pc)
+    {
+      entry_scope_lowpc = dip -> at_low_pc;
+      entry_scope_highpc = dip -> at_high_pc;
+    }
+  if (strcmp (dip -> at_name, "main") == 0)	/* FIXME: hardwired name */
+    {
+      main_scope_lowpc = dip -> at_low_pc;
+      main_scope_highpc = dip -> at_high_pc;
+    }
+  sym = new_symbol (dip);
+  openscope (sym, dip -> at_low_pc, dip -> at_high_pc);
+  process_dies (thisdie + dip -> dielength, enddie);
+  closescope ();
+}
+
+/*
+
+LOCAL FUNCTION
+
+	read_file_scope -- process all dies within a file scope
+
+SYNOPSIS
+
+	static void read_file_scope (struct dieinfo *dip, char *thisdie
+		char *enddie)
+
+DESCRIPTION
+
+	Process all dies within a given file scope.  We are passed a
+	pointer to the die information structure for the die which
+	starts the file scope, and pointers into the raw die data which
+	mark the range of dies within the file scope.
+
+	When the partial symbol table is built, the file offset for the line
+	number table for each compilation unit is saved in the partial symbol
+	table entry for that compilation unit.  As the symbols for each
+	compilation unit are read, the line number table is read into memory
+	and the variable lnbase is set to point to it.  Thus all we have to
+	do is use lnbase to access the line number table for the current
+	compilation unit.
+ */
+
+static void
+DEFUN(read_file_scope, (dip, thisdie, enddie),
+     struct dieinfo *dip AND
+     char *thisdie AND
+     char *enddie)
+{
+  struct cleanup *back_to;
+  
+  if (entry_point >= dip -> at_low_pc && entry_point < dip -> at_high_pc)
+    {
+      startup_file_start = dip -> at_low_pc;
+      startup_file_end = dip -> at_high_pc;
+    }
+  numutypes = (enddie - thisdie) / 4;
+  utypes = (struct type **) xmalloc (numutypes * sizeof (struct type *));
+  back_to = make_cleanup (free, utypes);
+  (void) memset (utypes, 0, numutypes * sizeof (struct type *));
+  start_symtab ();
+  openscope (NULL, dip -> at_low_pc, dip -> at_high_pc);
+  decode_line_numbers (lnbase);
+  process_dies (thisdie + dip -> dielength, enddie);
+  closescope ();
+  end_symtab (dip -> at_name, dip -> at_language);
+  do_cleanups (back_to);
+  utypes = NULL;
+  numutypes = 0;
+}
+
+/*
+
+LOCAL FUNCTION
+
+	start_symtab -- do initialization for starting new symbol table
+
+SYNOPSIS
+
+	static void start_symtab (void)
+
+DESCRIPTION
+
+	Called whenever we are starting to process dies for a new
+	compilation unit, to perform initializations.  Right now
+	the only thing we really have to do is initialize storage
+	space for the line number vector.
+
+ */
+
+static void
+DEFUN_VOID (start_symtab)
+{
+  int nbytes;
+
+  line_vector_index = 0;
+  line_vector_length = 1000;
+  nbytes = sizeof (struct linetable);
+  nbytes += line_vector_length * sizeof (struct linetable_entry);
+  line_vector = (struct linetable *) xmalloc (nbytes);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	process_dies -- process a range of DWARF Information Entries
+
+SYNOPSIS
+
+	static void process_dies (char *thisdie, char *enddie)
+
+DESCRIPTION
+
+	Process all DIE's in a specified range.  May be (and almost
+	certainly will be) called recursively.
+ */
+
+static void
+DEFUN(process_dies, (thisdie, enddie), char *thisdie AND char *enddie)
+{
+  char *nextdie;
+  struct dieinfo di;
+  
+  while (thisdie < enddie)
+    {
+      basicdieinfo (&di, thisdie);
+      if (di.dielength < sizeof (long))
+	{
+	  break;
+	}
+      else if (di.dietag == TAG_padding)
+	{
+	  nextdie = thisdie + di.dielength;
+	}
+      else
+	{
+	  completedieinfo (&di);
+	  if (di.at_sibling != 0)
+	    {
+	      nextdie = dbbase + di.at_sibling - dbroff;
+	    }
+	  else
+	    {
+	      nextdie = thisdie + di.dielength;
+	    }
+	  switch (di.dietag)
+	    {
+	    case TAG_compile_unit:
+	      read_file_scope (&di, thisdie, nextdie);
+	      break;
+	    case TAG_global_subroutine:
+	    case TAG_subroutine:
+	      if (!di.at_is_external_p)
+		{
+		  read_func_scope (&di, thisdie, nextdie);
+		}
+	      break;
+	    case TAG_lexical_block:
+	      read_lexical_block_scope (&di, thisdie, nextdie);
+	      break;
+	    case TAG_structure_type:
+	    case TAG_union_type:
+	      read_structure_scope (&di, thisdie, nextdie);
+	      break;
+	    case TAG_enumeration_type:
+	      read_enumeration (&di, thisdie, nextdie);
+	      break;
+	    case TAG_subroutine_type:
+	      read_subroutine_type (&di, thisdie, nextdie);
+	      break;
+	    case TAG_array_type:
+	      read_array_type (&di);
+	      break;
+	    default:
+	      (void) new_symbol (&di);
+	      break;
+	    }
+	}
+      thisdie = nextdie;
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	end_symtab -- finish processing for a compilation unit
+
+SYNOPSIS
+
+	static void end_symtab (char *filename, long language)
+
+DESCRIPTION
+
+	Complete the symbol table entry for the current compilation
+	unit.  Make the struct symtab and put it on the list of all
+	such symtabs.
+
+ */
+
+static void
+DEFUN(end_symtab, (filename, language), char *filename AND long language)
+{
+  struct symtab *symtab;
+  struct blockvector *blockvector;
+  int nbytes;
+  
+  /* Ignore a file that has no functions with real debugging info.  */
+  if (global_symbols == NULL && scopetree -> block == NULL)
+    {
+      free (line_vector);
+      line_vector = NULL;
+      line_vector_length = -1;
+      freescope (scopetree);
+      scope = scopetree = NULL;
+    }
+  
+  /* Create the blockvector that points to all the file's blocks.  */
+  
+  blockvector = make_blockvector ();
+  
+  /* Now create the symtab object for this source file.  */
+  
+  symtab = (struct symtab *) xmalloc (sizeof (struct symtab));
+  (void) memset (symtab, 0, sizeof (struct symtab));
+  
+  symtab -> free_ptr = 0;
+  
+  /* Fill in its components.  */
+  symtab -> blockvector = blockvector;
+  symtab -> free_code = free_linetable;
+  symtab -> filename = savestring (filename, strlen (filename));
+  
+  /* Save the line number information. */
+  
+  line_vector -> nitems = line_vector_index;
+  nbytes = sizeof (struct linetable);
+  if (line_vector_index > 1)
+    {
+      nbytes += (line_vector_index - 1) * sizeof (struct linetable_entry);
+    }
+  symtab -> linetable = (struct linetable *) xrealloc (line_vector, nbytes);
+  symtab -> nlines = 0;
+  symtab -> line_charpos = 0;
+  
+  /* FIXME:  The following may need to be expanded for other languages */
+  if (language == LANG_C89 || language == LANG_C) 
+    {
+      symtab -> language = language_c;
+    }
+  
+  /* Link the new symtab into the list of such.  */
+  symtab -> next = symtab_list;
+  symtab_list = symtab;
+  
+  /* Recursively free the scope tree */
+  freescope (scopetree);
+  scope = scopetree = NULL;
+  
+  /* Reinitialize for beginning of new file. */
+  line_vector = 0;
+  line_vector_length = -1;
+}
+
+/*
+
+LOCAL FUNCTION
+
+	scopecount -- count the number of enclosed scopes
+
+SYNOPSIS
+
+	static int scopecount (struct scopenode *node)
+
+DESCRIPTION
+
+	Given pointer to a node, compute the size of the subtree which is
+	rooted in this node, which also happens to be the number of scopes
+	to the subtree.
+ */
+
+static int
+DEFUN(scopecount, (node), struct scopenode *node)
+{
+  int count = 0;
+  
+  if (node != NULL)
+    {
+      count += scopecount (node -> child);
+      count += scopecount (node -> sibling);
+      count++;
+    }
+  return (count);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	openscope -- start a new lexical block scope
+
+SYNOPSIS
+
+	static void openscope (struct symbol *namesym, CORE_ADDR lowpc,
+		CORE_ADDR highpc)
+
+DESCRIPTION
+
+	Start a new scope by allocating a new scopenode, adding it as the
+	next child of the current scope (if any) or as the root of the
+	scope tree, and then making the new node the current scope node.
+ */
+
+static void
+DEFUN(openscope, (namesym, lowpc, highpc),
+     struct symbol *namesym AND
+     CORE_ADDR lowpc AND
+     CORE_ADDR highpc)
+{
+  struct scopenode *new;
+  struct scopenode *child;
+  
+  new = (struct scopenode *) xmalloc (sizeof (*new));
+  (void) memset (new, 0, sizeof (*new));
+  new -> namesym = namesym;
+  new -> lowpc = lowpc;
+  new -> highpc = highpc;
+  if (scope == NULL)
+    {
+      scopetree = new;
+    }
+  else if ((child = scope -> child) == NULL)
+    {
+      scope -> child = new;
+      new -> parent = scope;
+    }
+  else
+    {
+    while (child -> sibling != NULL)
+      {
+	child = child -> sibling;
+      }
+    child -> sibling = new;
+    new -> parent = scope;
+  }
+  scope = new;
+}
+
+/*
+
+LOCAL FUNCTION
+
+	freescope -- free a scope tree rooted at the given node
+
+SYNOPSIS
+
+	static void freescope (struct scopenode *node)
+
+DESCRIPTION
+
+	Given a pointer to a node in the scope tree, free the subtree
+	rooted at that node.  First free all the children and sibling
+	nodes, and then the node itself.  Used primarily for cleaning
+	up after ourselves and returning memory to the system.
+ */
+
+static void
+DEFUN(freescope, (node), struct scopenode *node)
+{
+  if (node != NULL)
+    {
+      freescope (node -> child);
+      freescope (node -> sibling);
+      free (node);
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	buildblock -- build a new block from pending symbols list
+
+SYNOPSIS
+
+	static struct block *buildblock (struct pending_symbol *syms)
+
+DESCRIPTION
+
+	Given a pointer to a list of symbols, build a new block and free
+	the symbol list structure.  Also check each symbol to see if it
+	is the special symbol that flags that this block was compiled by
+	gcc, and if so, mark the block appropriately.
+ */
+
+static struct block *
+DEFUN(buildblock, (syms), struct pending_symbol *syms)
+{
+  struct pending_symbol *next, *next1;
+  int i;
+  struct block *newblock;
+  int nbytes;
+  
+  for (next = syms, i = 0 ; next ; next = next -> next, i++) {;}
+  
+  /* Allocate a new block */
+  
+  nbytes = sizeof (struct block);
+  if (i > 1)
+    {
+      nbytes += (i - 1) * sizeof (struct symbol *);
+    }
+  newblock = (struct block *) obstack_alloc (symbol_obstack, nbytes);
+  (void) memset (newblock, 0, nbytes);
+  
+  /* Copy the symbols into the block.  */
+  
+  BLOCK_NSYMS (newblock) = i;
+  for (next = syms ; next ; next = next -> next)
+    {
+      BLOCK_SYM (newblock, --i) = next -> symbol;
+      if (STREQ (GCC_COMPILED_FLAG_SYMBOL, SYMBOL_NAME (next -> symbol)) ||
+	  STREQ (GCC2_COMPILED_FLAG_SYMBOL, SYMBOL_NAME (next -> symbol)))
+	{
+	  BLOCK_GCC_COMPILED (newblock) = 1;
+	}
+    }    
+  
+  /* Now free the links of the list, and empty the list.  */
+  
+  for (next = syms ; next ; next = next1)
+    {
+      next1 = next -> next;
+      free (next);
+    }
+  
+  return (newblock);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	closescope -- close a lexical block scope
+
+SYNOPSIS
+
+	static void closescope (void)
+
+DESCRIPTION
+
+	Close the current lexical block scope.  Closing the current scope
+	is as simple as moving the current scope pointer up to the parent
+	of the current scope pointer.  But we also take this opportunity
+	to build the block for the current scope first, since we now have
+	all of it's symbols.
+ */
+
+static void
+DEFUN_VOID(closescope)
+{
+  struct scopenode *child;
+  
+  if (scope == NULL)
+    {
+      error ("DWARF parse error, too many close scopes");
+    }
+  else
+    {
+      if (scope -> parent == NULL)
+	{
+	  global_symbol_block = buildblock (global_symbols);
+	  global_symbols = NULL;
+	  BLOCK_START (global_symbol_block) = scope -> lowpc + baseaddr;
+	  BLOCK_END (global_symbol_block) = scope -> highpc + baseaddr;
+	}
+      scope -> block = buildblock (scope -> symbols);
+      scope -> symbols = NULL;
+      BLOCK_START (scope -> block) = scope -> lowpc + baseaddr;
+      BLOCK_END (scope -> block) = scope -> highpc + baseaddr;
+    
+      /* Put the local block in as the value of the symbol that names it.  */
+    
+      if (scope -> namesym)
+	{
+	  SYMBOL_BLOCK_VALUE (scope -> namesym) = scope -> block;
+	  BLOCK_FUNCTION (scope -> block) = scope -> namesym;
+	}
+    
+    /*  Install this scope's local block as the superblock of all child
+	scope blocks. */
+    
+    for (child = scope -> child ; child ; child = child -> sibling)
+      {
+	BLOCK_SUPERBLOCK (child -> block) = scope -> block;
+      }
+    
+      scope = scope -> parent;
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	record_line -- record a line number entry in the line vector
+
+SYNOPSIS
+
+	static void record_line (int line, CORE_ADDR pc)
+
+DESCRIPTION
+
+	Given a line number and the corresponding pc value, record
+	this pair in the line number vector, expanding the vector as
+	necessary.
+ */
+
+static void
+DEFUN(record_line, (line, pc), int line AND CORE_ADDR pc)
+{
+  struct linetable_entry *e;
+  int nbytes;
+  
+  /* Make sure line vector is big enough.  */
+  
+  if (line_vector_index + 2 >= line_vector_length)
+    {
+      line_vector_length *= 2;
+      nbytes = sizeof (struct linetable);
+      nbytes += (line_vector_length * sizeof (struct linetable_entry));
+      line_vector = (struct linetable *) xrealloc (line_vector, nbytes);
+    }
+  e = line_vector -> item + line_vector_index++;
+  e -> line = line;
+  e -> pc = pc;
+}
+
+/*
+
+LOCAL FUNCTION
+
+	decode_line_numbers -- decode a line number table fragment
+
+SYNOPSIS
+
+	static void decode_line_numbers (char *tblscan, char *tblend,
+		long length, long base, long line, long pc)
+
+DESCRIPTION
+
+	Translate the DWARF line number information to gdb form.
+
+	The ".line" section contains one or more line number tables, one for
+	each ".line" section from the objects that were linked.
+
+	The AT_stmt_list attribute for each TAG_source_file entry in the
+	".debug" section contains the offset into the ".line" section for the
+	start of the table for that file.
+
+	The table itself has the following structure:
+
+	<table length><base address><source statement entry>
+	4 bytes       4 bytes       10 bytes
+
+	The table length is the total size of the table, including the 4 bytes
+	for the length information.
+
+	The base address is the address of the first instruction generated
+	for the source file.
+
+	Each source statement entry has the following structure:
+
+	<line number><statement position><address delta>
+	4 bytes      2 bytes             4 bytes
+
+	The line number is relative to the start of the file, starting with
+	line 1.
+
+	The statement position either -1 (0xFFFF) or the number of characters
+	from the beginning of the line to the beginning of the statement.
+
+	The address delta is the difference between the base address and
+	the address of the first instruction for the statement.
+
+	Note that we must copy the bytes from the packed table to our local
+	variables before attempting to use them, to avoid alignment problems
+	on some machines, particularly RISC processors.
+
+BUGS
+
+	Does gdb expect the line numbers to be sorted?  They are now by
+	chance/luck, but are not required to be.  (FIXME)
+
+	The line with number 0 is unused, gdb apparently can discover the
+	span of the last line some other way. How?  (FIXME)
+ */
+
+static void
+DEFUN(decode_line_numbers, (linetable), char *linetable)
+{
+  char *tblscan;
+  char *tblend;
+  long length;
+  long base;
+  long line;
+  long pc;
+  
+  if (linetable != NULL)
+    {
+      tblscan = tblend = linetable;
+      (void) memcpy (&length, tblscan, sizeof (long));
+      tblscan += sizeof (long);
+      tblend += length;
+      (void) memcpy (&base, tblscan, sizeof (long));
+      base += baseaddr;
+      tblscan += sizeof (long);
+      while (tblscan < tblend)
+	{
+	  (void) memcpy (&line, tblscan, sizeof (long));
+	  tblscan += sizeof (long) + sizeof (short);
+	  (void) memcpy (&pc, tblscan, sizeof (long));
+	  tblscan += sizeof (long);
+	  pc += base;
+	  if (line > 0)
+	    {
+	      record_line (line, pc);
+	    }
+	}
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	add_symbol_to_list -- add a symbol to head of current symbol list
+
+SYNOPSIS
+
+	static void add_symbol_to_list (struct symbol *symbol, struct
+		pending_symbol **listhead)
+
+DESCRIPTION
+
+	Given a pointer to a symbol and a pointer to a pointer to a
+	list of symbols, add this symbol as the current head of the
+	list.  Typically used for example to add a symbol to the
+	symbol list for the current scope.
+
+ */
+
+static void
+DEFUN(add_symbol_to_list, (symbol, listhead),
+     struct symbol *symbol AND struct pending_symbol **listhead)
+{
+  struct pending_symbol *link;
+  
+  if (symbol != NULL)
+    {
+      link = (struct pending_symbol *) xmalloc (sizeof (*link));
+      link -> next = *listhead;
+      link -> symbol = symbol;
+      *listhead = link;
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	gatherblocks -- walk a scope tree and build block vectors
+
+SYNOPSIS
+
+	static struct block **gatherblocks (struct block **dest,
+		struct scopenode *node)
+
+DESCRIPTION
+
+	Recursively walk a scope tree rooted in the given node, adding blocks
+	to the array pointed to by DEST, in preorder.  I.E., first we add the
+	block for the current scope, then all the blocks for child scopes,
+	and finally all the blocks for sibling scopes.
+ */
+
+static struct block **
+DEFUN(gatherblocks, (dest, node),
+      struct block **dest AND struct scopenode *node)
+{
+  if (node != NULL)
+    {
+      *dest++ = node -> block;
+      dest = gatherblocks (dest, node -> child);
+      dest = gatherblocks (dest, node -> sibling);
+    }
+  return (dest);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	make_blockvector -- make a block vector from current scope tree
+
+SYNOPSIS
+
+	static struct blockvector *make_blockvector (void)
+
+DESCRIPTION
+
+	Make a blockvector from all the blocks in the current scope tree.
+	The first block is always the global symbol block, followed by the
+	block for the root of the scope tree which is the local symbol block,
+	followed by all the remaining blocks in the scope tree, which are all
+	local scope blocks.
+
+NOTES
+
+	Note that since the root node of the scope tree is created at the time
+	each file scope is entered, there are always at least two blocks,
+	neither of which may have any symbols, but always contribute a block
+	to the block vector.  So the test for number of blocks greater than 1
+	below is unnecessary given bug free code.
+
+	The resulting block structure varies slightly from that produced
+	by dbxread.c, in that block 0 and block 1 are sibling blocks while
+	with dbxread.c, block 1 is a child of block 0.  This does not
+	seem to cause any problems, but probably should be fixed. (FIXME)
+ */
+
+static struct blockvector *
+DEFUN_VOID(make_blockvector)
+{
+  struct blockvector *blockvector = NULL;
+  int i;
+  int nbytes;
+  
+  /* Recursively walk down the tree, counting the number of blocks.
+     Then add one to account for the global's symbol block */
+  
+  i = scopecount (scopetree) + 1;
+  nbytes = sizeof (struct blockvector);
+  if (i > 1)
+    {
+      nbytes += (i - 1) * sizeof (struct block *);
+    }
+  blockvector = (struct blockvector *)
+    obstack_alloc (symbol_obstack, nbytes);
+  
+  /* Copy the blocks into the blockvector. */
+  
+  BLOCKVECTOR_NBLOCKS (blockvector) = i;
+  BLOCKVECTOR_BLOCK (blockvector, 0) = global_symbol_block;
+  gatherblocks (&BLOCKVECTOR_BLOCK (blockvector, 1), scopetree);
+  
+  return (blockvector);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	locval -- compute the value of a location attribute
+
+SYNOPSIS
+
+	static int locval (char *loc)
+
+DESCRIPTION
+
+	Given pointer to a string of bytes that define a location, compute
+	the location and return the value.
+
+	When computing values involving the current value of the frame pointer,
+	the value zero is used, which results in a value relative to the frame
+	pointer, rather than the absolute value.  This is what GDB wants
+	anyway.
+    
+	When the result is a register number, the global isreg flag is set,
+	otherwise it is cleared.  This is a kludge until we figure out a better
+	way to handle the problem.  Gdb's design does not mesh well with the
+	DWARF notion of a location computing interpreter, which is a shame
+	because the flexibility goes unused.
+
+NOTES
+
+	Note that stack[0] is unused except as a default error return.
+	Note that stack overflow is not yet handled.
+ */
+
+static int
+DEFUN(locval, (loc), char *loc)
+{
+  unsigned short nbytes;
+  auto int stack[64];
+  int stacki;
+  char *end;
+  long regno;
+  
+  (void) memcpy (&nbytes, loc, sizeof (short));
+  end = loc + sizeof (short) + nbytes;
+  stacki = 0;
+  stack[stacki] = 0;
+  isreg = 0;
+  for (loc += sizeof (short); loc < end; loc += sizeof (long))
+    {
+      switch (*loc++) {
+      case 0:
+	/* error */
+	loc = end;
+	break;
+      case OP_REG:
+	/* push register (number) */
+	(void) memcpy (&stack[++stacki], loc, sizeof (long));
+	isreg = 1;
+	break;
+      case OP_BASEREG:
+	/* push value of register (number) */
+	/* Actually, we compute the value as if register has 0 */
+	(void) memcpy (&regno, loc, sizeof (long));
+	if (regno == R_FP)
+	  {
+	    stack[++stacki] = 0;
+	  }
+	else
+	  {
+	    stack[++stacki] = 0;
+	    SQUAWK (("BASEREG %d not handled!", regno));
+	  }
+	break;
+      case OP_ADDR:
+	/* push address (relocated address) */
+	(void) memcpy (&stack[++stacki], loc, sizeof (long));
+	break;
+      case OP_CONST:
+	/* push constant (number) */
+	(void) memcpy (&stack[++stacki], loc, sizeof (long));
+	break;
+      case OP_DEREF2:
+	/* pop, deref and push 2 bytes (as a long) */
+	SQUAWK (("OP_DEREF2 address %#x not handled", stack[stacki]));
+	break;
+      case OP_DEREF4:	/* pop, deref and push 4 bytes (as a long) */
+	SQUAWK (("OP_DEREF4 address %#x not handled", stack[stacki]));
+	break;
+      case OP_ADD:	/* pop top 2 items, add, push result */
+	stack[stacki - 1] += stack[stacki];
+	stacki--;
+	break;
+      }
+    }
+  return (stack[stacki]);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	read_ofile_symtab -- build a full symtab entry from chunk of DIE's
+
+SYNOPSIS
+
+	static struct symtab *read_ofile_symtab (struct partial_symtab *pst,
+		int desc)
+
+DESCRIPTION
+
+	DESC is the file descriptor for the file, positioned at the
+	beginning of the symtab
+	SYM_SIZE is the size of the symbol section to read
+	TEXT_OFFSET is the beginning of the text segment we are reading
+	symbols for
+	TEXT_SIZE is the size of the text segment read in.
+	OFFSET is a relocation offset which gets added to each symbol
+
+ */
+
+static struct symtab *
+DEFUN(read_ofile_symtab, (pst, desc),
+      struct partial_symtab *pst AND
+      int desc)
+{
+  struct cleanup *back_to;
+  long lnsize;
+  int foffset;
+  
+  /* Allocate a buffer for the entire chunk of DIE's for this compilation
+     unit, seek to the location in the file, and read in all the DIE's. */
+
+  diecount = 0;
+  dbbase = xmalloc (DBLENGTH(pst));
+  dbroff = DBROFF(pst);
+  foffset = DBFOFF(pst) + dbroff;
+  if ((lseek (desc, foffset, 0) != foffset) ||
+      (read (desc, dbbase, DBLENGTH(pst)) != DBLENGTH(pst)))
+    {
+      free (dbbase);
+      error ("can't read DWARF data");
+    }
+  back_to = make_cleanup (free, dbbase);
+
+  /* If there is a line number table associated with this compilation unit
+     then read the first long word from the line number table fragment, which
+     contains the size of the fragment in bytes (including the long word
+     itself).  Allocate a buffer for the fragment and read it in for future
+     processing. */
+
+  lnbase = NULL;
+  if (LNFOFF (pst))
+    {
+      if ((lseek (desc, LNFOFF (pst), 0) != LNFOFF (pst)) ||
+	  (read (desc, &lnsize, sizeof(long)) != sizeof(long)))
+	{
+	  error ("can't read DWARF line number table size");
+	}
+      lnbase = xmalloc (lnsize);
+      if ((lseek (desc, LNFOFF (pst), 0) != LNFOFF (pst)) ||
+	  (read (desc, lnbase, lnsize) != lnsize))
+	{
+	  free (lnbase);
+	  error ("can't read DWARF line numbers");
+	}
+      make_cleanup (free, lnbase);
+    }
+
+  process_dies (dbbase, dbbase + DBLENGTH(pst));
+  do_cleanups (back_to);
+  return (symtab_list);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	psymtab_to_symtab_1 -- do grunt work for building a full symtab entry
+
+SYNOPSIS
+
+	static void psymtab_to_symtab_1 (struct partial_symtab *pst, int desc)
+
+DESCRIPTION
+
+	Called once for each partial symbol table entry that needs to be
+	expanded into a full symbol table entry.
+
+*/
+
+static void
+DEFUN(psymtab_to_symtab_1,
+      (pst, desc),
+      struct partial_symtab *pst AND
+      int desc)
+{
+  int i;
+  
+  if (!pst)
+    {
+      return;
+    }
+  if (pst->readin)
+    {
+      fprintf (stderr, "Psymtab for %s already read in.  Shouldn't happen.\n",
+	       pst -> filename);
+      return;
+    }
+  
+  /* Read in all partial symtabs on which this one is dependent */
+  for (i = 0; i < pst -> number_of_dependencies; i++)
+    if (!pst -> dependencies[i] -> readin)
+      {
+	/* Inform about additional files that need to be read in.  */
+	if (info_verbose)
+	  {
+	    fputs_filtered (" ", stdout);
+	    wrap_here ("");
+	    fputs_filtered ("and ", stdout);
+	    wrap_here ("");
+	    printf_filtered ("%s...", pst -> dependencies[i] -> filename);
+	    wrap_here ("");		/* Flush output */
+	    fflush (stdout);
+	  }
+	psymtab_to_symtab_1 (pst -> dependencies[i], desc);
+      }
+  
+  if (DBLENGTH(pst))		/* Otherwise it's a dummy */
+    {
+      /* Init stuff necessary for reading in symbols */
+      pst -> symtab = read_ofile_symtab (pst, desc);
+      if (info_verbose)
+	{
+	  printf_filtered ("%d DIE's, sorting...", diecount);
+	  fflush (stdout);
+	}
+      sort_symtab_syms (pst -> symtab);
+    }
+  pst -> readin = 1;
+}
+
+/*
+
+LOCAL FUNCTION
+
+	dwarf_psymtab_to_symtab -- build a full symtab entry from partial one
+
+SYNOPSIS
+
+	static void dwarf_psymtab_to_symtab (struct partial_symtab *pst)
+
+DESCRIPTION
+
+	This is the DWARF support entry point for building a full symbol
+	table entry from a partial symbol table entry.  We are passed a
+	pointer to the partial symbol table entry that needs to be expanded.
+
+*/
+
+static void
+DEFUN(dwarf_psymtab_to_symtab, (pst), struct partial_symtab *pst)
+{
+  int desc;
+  struct cleanup *old_chain;
+  bfd *sym_bfd;
+  
+  if (!pst)
+    {
+      return;
+    }
+  if (pst -> readin)
+    {
+      fprintf (stderr, "Psymtab for %s already read in.  Shouldn't happen.\n",
+	       pst -> filename);
+      return;
+    }
+  
+  if (DBLENGTH(pst) || pst -> number_of_dependencies)
+    {
+      /* Print the message now, before starting serious work, to avoid
+	 disconcerting pauses.  */
+      if (info_verbose)
+	{
+	  printf_filtered ("Reading in symbols for %s...", pst -> filename);
+	  fflush (stdout);
+	}
+      
+      /* Open symbol file.  Symbol_file_command guarantees that the symbol
+	 file name will be absolute, so there is no need for openp.  */
+      desc = open (pst -> symfile_name, O_RDONLY, 0);
+      
+      if (desc < 0)
+	{
+	  perror_with_name (pst -> symfile_name);
+	}
+      
+      sym_bfd = bfd_fdopenr (pst -> symfile_name, NULL, desc);
+      if (!sym_bfd)
+	{
+	  (void) close (desc);
+	  error ("Could not open `%s' to read symbols: %s",
+		 pst -> symfile_name, bfd_errmsg (bfd_error));
+	}
+      old_chain = make_cleanup (bfd_close, sym_bfd);
+      if (!bfd_check_format (sym_bfd, bfd_object))
+	{
+	  error ("\"%s\": can't read symbols: %s.",
+		 pst -> symfile_name, bfd_errmsg (bfd_error));
+	}
+      
+      psymtab_to_symtab_1 (pst, desc);
+      
+#if 0 /* FIXME:  Check to see what dbxread is doing here and see if
+	 we need to do an equivalent or is this something peculiar to
+	 stabs/a.out format. */
+      /* Match with global symbols.  This only needs to be done once,
+         after all of the symtabs and dependencies have been read in.   */
+      scan_file_globals ();
+#endif
+      
+      do_cleanups (old_chain);
+      
+      /* Finish up the debug error message.  */
+      if (info_verbose)
+	{
+	  printf_filtered ("done.\n");
+	}
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	init_psymbol_list -- initialize storage for partial symbols
+
+SYNOPSIS
+
+	static void init_psymbol_list (int total_symbols)
+
+DESCRIPTION
+
+	Initializes storage for all of the partial symbols that will be
+	created by dwarf_build_psymtabs and subsidiaries.
+ */
+
+static void
+DEFUN(init_psymbol_list, (total_symbols), int total_symbols)
+{
+  /* Free any previously allocated psymbol lists.  */
+  
+  if (global_psymbols.list)
+    {
+      free (global_psymbols.list);
+    }
+  if (static_psymbols.list)
+    {
+      free (static_psymbols.list);
+    }
+  
+  /* Current best guess is that there are approximately a twentieth
+     of the total symbols (in a debugging file) are global or static
+     oriented symbols */
+  
+  global_psymbols.size = total_symbols / 10;
+  static_psymbols.size = total_symbols / 10;
+  global_psymbols.next = global_psymbols.list = (struct partial_symbol *)
+    xmalloc (global_psymbols.size * sizeof (struct partial_symbol));
+  static_psymbols.next = static_psymbols.list = (struct partial_symbol *)
+    xmalloc (static_psymbols.size * sizeof (struct partial_symbol));
+}
+
+/*
+
+LOCAL FUNCTION
+
+	start_psymtab -- allocate and partially fill a partial symtab entry
+
+DESCRIPTION
+
+	Allocate and partially fill a partial symtab.  It will be completely
+	filled at the end of the symbol list.
+   
+	SYMFILE_NAME is the name of the symbol-file we are reading from, and
+	ADDR is the address relative to which its symbols are (incremental)
+	or 0 (normal).  FILENAME is the name of the compilation unit that
+	these symbols were defined in, and they appear starting a address
+	TEXTLOW.  DBROFF is the absolute file offset in SYMFILE_NAME where
+	the full symbols can be read for compilation unit FILENAME.
+	GLOBAL_SYMS and STATIC_SYMS are pointers to the current end of the
+	psymtab vector.
+
+ */
+
+static struct partial_symtab *
+DEFUN(start_psymtab,
+      (symfile_name, addr, filename, textlow, texthigh, dbfoff, curoff,
+       culength, lnfoff, global_syms, static_syms),
+      char *symfile_name AND
+      CORE_ADDR addr AND
+      char *filename AND
+      CORE_ADDR textlow AND
+      CORE_ADDR texthigh AND
+      int dbfoff AND
+      int curoff AND
+      int culength AND
+      int lnfoff AND
+      struct partial_symbol *global_syms AND
+      struct partial_symbol *static_syms)
+{
+  struct partial_symtab *result;
+
+  result = (struct partial_symtab *)
+      obstack_alloc (psymbol_obstack, sizeof (struct partial_symtab));
+  (void) memset (result, 0, sizeof (struct partial_symtab));
+  result -> addr = addr;
+  result -> symfile_name =  create_name (symfile_name, psymbol_obstack);
+  result -> filename = create_name (filename, psymbol_obstack);
+  result -> textlow = textlow;
+  result -> texthigh = texthigh;
+  result -> read_symtab_private = (char *) obstack_alloc (psymbol_obstack,
+						  sizeof (struct dwfinfo));
+  DBFOFF (result) = dbfoff;
+  DBROFF (result) = curoff;
+  DBLENGTH (result) = culength;
+  LNFOFF (result)  = lnfoff;
+  result -> readin = 0;
+  result -> symtab = NULL;
+  result -> read_symtab = dwarf_psymtab_to_symtab;
+  result -> globals_offset = global_syms - global_psymbols.list;
+  result -> statics_offset = static_syms - static_psymbols.list;
+  
+  result->n_global_syms = 0;
+  result->n_static_syms = 0;
+  
+  return result;
+}
+
+/*
+
+LOCAL FUNCTION
+
+	add_psymbol_to_list -- add a partial symbol to given list
+
+DESCRIPTION
+
+	Add a partial symbol to one of the partial symbol vectors (pointed to
+	by listp).  The vector is grown as necessary.
+
+ */
+
+static void
+DEFUN(add_psymbol_to_list,
+      (listp, name, space, class, value),
+      struct psymbol_allocation_list *listp AND
+      char *name AND
+      enum namespace space AND
+      enum address_class class AND
+      CORE_ADDR value)
+{
+  struct partial_symbol *psym;
+  int newsize;
+  
+  if (listp -> next >= listp -> list + listp -> size)
+    {
+      newsize = listp -> size * 2;
+      listp -> list = (struct partial_symbol *)
+	xrealloc (listp -> list, (newsize * sizeof (struct partial_symbol)));
+      /* Next assumes we only went one over.  Should be good if program works
+	 correctly */
+      listp -> next = listp -> list + listp -> size;
+      listp -> size = newsize;
+    }
+  psym = listp -> next++;
+  SYMBOL_NAME (psym) = create_name (name, psymbol_obstack);
+  SYMBOL_NAMESPACE (psym) = space;
+  SYMBOL_CLASS (psym) = class;
+  SYMBOL_VALUE (psym) = value;
+}
+
+/*
+
+LOCAL FUNCTION
+
+	add_partial_symbol -- add symbol to partial symbol table
+
+DESCRIPTION
+
+	Given a DIE, if it is one of the types that we want to
+	add to a partial symbol table, finish filling in the die info
+	and then add a partial symbol table entry for it.
+
+*/
+
+static void
+DEFUN(add_partial_symbol, (dip), struct dieinfo *dip)
+{
+  switch (dip -> dietag)
+    {
+    case TAG_global_subroutine:
+      record_misc_function (dip -> at_name, dip -> at_low_pc);
+      add_psymbol_to_list (&global_psymbols, dip -> at_name, VAR_NAMESPACE,
+			   LOC_BLOCK, dip -> at_low_pc);
+      break;
+    case TAG_global_variable:
+      add_psymbol_to_list (&global_psymbols, dip -> at_name, VAR_NAMESPACE,
+			   LOC_STATIC, 0);
+      break;
+    case TAG_subroutine:
+      add_psymbol_to_list (&static_psymbols, dip -> at_name, VAR_NAMESPACE,
+			   LOC_BLOCK, dip -> at_low_pc);
+      break;
+    case TAG_local_variable:
+      add_psymbol_to_list (&static_psymbols, dip -> at_name, VAR_NAMESPACE,
+			   LOC_STATIC, 0);
+      break;
+    case TAG_typedef:
+      add_psymbol_to_list (&static_psymbols, dip -> at_name, VAR_NAMESPACE,
+			   LOC_TYPEDEF, 0);
+      break;
+    case TAG_structure_type:
+    case TAG_union_type:
+    case TAG_enumeration_type:
+      add_psymbol_to_list (&static_psymbols, dip -> at_name, STRUCT_NAMESPACE,
+			   LOC_TYPEDEF, 0);
+      break;
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	scan_partial_symbols -- scan DIE's within a single compilation unit
+
+DESCRIPTION
+
+	Process the DIE's within a single compilation unit, looking for
+	interesting DIE's that contribute to the partial symbol table entry
+	for this compilation unit.  Since we cannot follow any sibling
+	chains without reading the complete DIE info for every DIE,
+	it is probably faster to just sequentially check each one to
+	see if it is one of the types we are interested in, and if
+	so, then extracting all the attributes info and generating a
+	partial symbol table entry.
+
+ */
+
+static void
+DEFUN(scan_partial_symbols, (thisdie, enddie), char *thisdie AND char *enddie)
+{
+  char *nextdie;
+  struct dieinfo di;
+  
+  while (thisdie < enddie)
+    {
+      basicdieinfo (&di, thisdie);
+      if (di.dielength < sizeof (long))
+	{
+	  break;
+	}
+      else
+	{
+	  nextdie = thisdie + di.dielength;
+	  switch (di.dietag)
+	    {
+	    case TAG_global_subroutine:
+	    case TAG_global_variable:
+	    case TAG_subroutine:
+	    case TAG_local_variable:
+	    case TAG_typedef:
+	    case TAG_structure_type:
+	    case TAG_union_type:
+	    case TAG_enumeration_type:
+	      completedieinfo (&di);
+	      /* Don't attempt to add anonymous structures, unions, or
+		 enumerations since they have no name.  Also check that
+		 this is the place where the actual definition occurs,
+		 rather than just a reference to an external. */
+	      if (di.at_name != NULL && !di.at_is_external_p)
+		{
+		  add_partial_symbol (&di);
+		}
+	      break;
+	    }
+	}
+      thisdie = nextdie;
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	scan_compilation_units -- build a psymtab entry for each compilation
+
+DESCRIPTION
+
+	This is the top level dwarf parsing routine for building partial
+	symbol tables.
+
+	It scans from the beginning of the DWARF table looking for the first
+	TAG_compile_unit DIE, and then follows the sibling chain to locate
+	each additional TAG_compile_unit DIE.
+   
+	For each TAG_compile_unit DIE it creates a partial symtab structure,
+	calls a subordinate routine to collect all the compilation unit's
+	global DIE's, file scope DIEs, typedef DIEs, etc, and then links the
+	new partial symtab structure into the partial symbol table.  It also
+	records the appropriate information in the partial symbol table entry
+	to allow the chunk of DIE's and line number table for this compilation
+	unit to be located and re-read later, to generate a complete symbol
+	table entry for the compilation unit.
+
+	Thus it effectively partitions up a chunk of DIE's for multiple
+	compilation units into smaller DIE chunks and line number tables,
+	and associates them with a partial symbol table entry.
+
+NOTES
+
+	If any compilation unit has no line number table associated with
+	it for some reason (a missing at_stmt_list attribute, rather than
+	just one with a value of zero, which is valid) then we ensure that
+	the recorded file offset is zero so that the routine which later
+	reads line number table fragments knows that there is no fragment
+	to read.
+
+RETURNS
+
+	Returns no value.
+
+ */
+
+static void
+DEFUN(scan_compilation_units,
+      (filename, addr, thisdie, enddie, dbfoff, lnoffset),
+      char *filename AND
+      CORE_ADDR addr AND
+      char *thisdie AND
+      char *enddie AND
+      unsigned int dbfoff AND
+      unsigned int lnoffset)
+{
+  char *nextdie;
+  struct dieinfo di;
+  struct partial_symtab *pst;
+  int culength;
+  int curoff;
+  int curlnoffset;
+
+  while (thisdie < enddie)
+    {
+      basicdieinfo (&di, thisdie);
+      if (di.dielength < sizeof (long))
+	{
+	  break;
+	}
+      else if (di.dietag != TAG_compile_unit)
+	{
+	  nextdie = thisdie + di.dielength;
+	}
+      else
+	{
+	  completedieinfo (&di);
+	  if (di.at_sibling != 0)
+	    {
+	      nextdie = dbbase + di.at_sibling - dbroff;
+	    }
+	  else
+	    {
+	      nextdie = thisdie + di.dielength;
+	    }
+	  curoff = thisdie - dbbase;
+	  culength = nextdie - thisdie;
+	  curlnoffset = di.at_stmt_list_p ? lnoffset + di.at_stmt_list : 0;
+	  pst = start_psymtab (filename, addr, di.at_name,
+				     di.at_low_pc, di.at_high_pc,
+				     dbfoff, curoff, culength, curlnoffset,
+				     global_psymbols.next,
+				     static_psymbols.next);
+	  scan_partial_symbols (thisdie + di.dielength, nextdie);
+	  pst -> n_global_syms = global_psymbols.next -
+	    (global_psymbols.list + pst -> globals_offset);
+	  pst -> n_static_syms = static_psymbols.next - 
+	    (static_psymbols.list + pst -> statics_offset);
+	  /* Sort the global list; don't sort the static list */
+	  qsort (global_psymbols.list + pst -> globals_offset,
+		 pst -> n_global_syms, sizeof (struct partial_symbol),
+		 compare_psymbols);
+	  /* If there is already a psymtab or symtab for a file of this name,
+	     remove it. (If there is a symtab, more drastic things also
+	     happen.)  This happens in VxWorks.  */
+	  free_named_symtabs (pst -> filename);
+	  /* Place the partial symtab on the partial symtab list */
+	  pst -> next = partial_symtab_list;
+	  partial_symtab_list = pst;
+	}
+      thisdie = nextdie;      
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	new_symbol -- make a symbol table entry for a new symbol
+
+SYNOPSIS
+
+	static struct symbol *new_symbol (struct dieinfo *dip)
+
+DESCRIPTION
+
+	Given a pointer to a DWARF information entry, figure out if we need
+	to make a symbol table entry for it, and if so, create a new entry
+	and return a pointer to it.
+ */
+
+static struct symbol *
+DEFUN(new_symbol, (dip), struct dieinfo *dip)
+{
+  struct symbol *sym = NULL;
+  
+  if (dip -> at_name != NULL)
+    {
+      sym = (struct symbol *) obstack_alloc (symbol_obstack,
+					     sizeof (struct symbol));
+      (void) memset (sym, 0, sizeof (struct symbol));
+      SYMBOL_NAME (sym) = create_name (dip -> at_name, symbol_obstack);
+      /* default assumptions */
+      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
+      SYMBOL_CLASS (sym) = LOC_STATIC;
+      SYMBOL_TYPE (sym) = decode_die_type (dip);
+      switch (dip -> dietag)
+	{
+	case TAG_label:
+	  SYMBOL_VALUE (sym) = dip -> at_low_pc + baseaddr;
+	  SYMBOL_CLASS (sym) = LOC_LABEL;
+	  break;
+	case TAG_global_subroutine:
+	case TAG_subroutine:
+	  SYMBOL_VALUE (sym) = dip -> at_low_pc + baseaddr;
+	  SYMBOL_TYPE (sym) = lookup_function_type (SYMBOL_TYPE (sym));
+	  SYMBOL_CLASS (sym) = LOC_BLOCK;
+	  if (dip -> dietag == TAG_global_subroutine)
+	    {
+	      add_symbol_to_list (sym, &global_symbols);
+	    }
+	  else
+	    {
+	      add_symbol_to_list (sym, &scope -> symbols);
+	    }
+	  break;
+	case TAG_global_variable:
+	case TAG_local_variable:
+	  if (dip -> at_location != NULL)
+	    {
+	      SYMBOL_VALUE (sym) = locval (dip -> at_location);
+	    }
+	  if (dip -> dietag == TAG_global_variable)
+	    {
+	      add_symbol_to_list (sym, &global_symbols);
+	      SYMBOL_CLASS (sym) = LOC_STATIC;
+	      SYMBOL_VALUE (sym) += baseaddr;
+	    }
+	  else
+	    {
+	      add_symbol_to_list (sym, &scope -> symbols);
+	      if (scope -> parent != NULL)
+		{
+		  if (isreg)
+		    {
+		      SYMBOL_CLASS (sym) = LOC_REGISTER;
+		    }
+		  else
+		    {
+		      SYMBOL_CLASS (sym) = LOC_LOCAL;
+		    }
+		}
+	      else
+		{
+		  SYMBOL_CLASS (sym) = LOC_STATIC;
+		  SYMBOL_VALUE (sym) += baseaddr;
+		}
+	    }
+	  break;
+	case TAG_formal_parameter:
+	  if (dip -> at_location != NULL)
+	    {
+	      SYMBOL_VALUE (sym) = locval (dip -> at_location);
+	    }
+	  add_symbol_to_list (sym, &scope -> symbols);
+	  if (isreg)
+	    {
+	      SYMBOL_CLASS (sym) = LOC_REGPARM;
+	    }
+	  else
+	    {
+	      SYMBOL_CLASS (sym) = LOC_ARG;
+	    }
+	  break;
+	case TAG_unspecified_parameters:
+	  /* From varargs functions; gdb doesn't seem to have any interest in
+	     this information, so just ignore it for now. (FIXME?) */
+	  break;
+	case TAG_structure_type:
+	case TAG_union_type:
+	case TAG_enumeration_type:
+	  SYMBOL_CLASS (sym) = LOC_TYPEDEF;
+	  SYMBOL_NAMESPACE (sym) = STRUCT_NAMESPACE;
+	  add_symbol_to_list (sym, &scope -> symbols);
+	  break;
+	case TAG_typedef:
+	  SYMBOL_CLASS (sym) = LOC_TYPEDEF;
+	  SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
+	  add_symbol_to_list (sym, &scope -> symbols);
+	  break;
+	default:
+	  /* Not a tag we recognize.  Hopefully we aren't processing trash
+	     data, but since we must specifically ignore things we don't
+	     recognize, there is nothing else we should do at this point. */
+	  break;
+	}
+    }
+  return (sym);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	decode_mod_fund_type -- decode a modified fundamental type
+
+SYNOPSIS
+
+	static struct type *decode_mod_fund_type (char *typedata)
+
+DESCRIPTION
+
+	Decode a block of data containing a modified fundamental
+	type specification.  TYPEDATA is a pointer to the block,
+	which consists of a two byte length, containing the size
+	of the rest of the block.  At the end of the block is a
+	two byte value that gives the fundamental type.  Everything
+	in between are type modifiers.
+
+	We simply compute the number of modifiers and call the general
+	function decode_modified_type to do the actual work.
+*/
+
+static struct type *
+DEFUN(decode_mod_fund_type, (typedata), char *typedata)
+{
+  struct type *typep = NULL;
+  unsigned short modcount;
+  unsigned char *modifiers;
+  
+  /* Get the total size of the block, exclusive of the size itself */
+  (void) memcpy (&modcount, typedata, sizeof (short));
+  /* Deduct the size of the fundamental type bytes at the end of the block. */
+  modcount -= sizeof (short);
+  /* Skip over the two size bytes at the beginning of the block. */
+  modifiers = typedata + sizeof (short);
+  /* Now do the actual decoding */
+  typep = decode_modified_type (modifiers, modcount, AT_mod_fund_type);
+  return (typep);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	decode_mod_u_d_type -- decode a modified user defined type
+
+SYNOPSIS
+
+	static struct type *decode_mod_u_d_type (char *typedata)
+
+DESCRIPTION
+
+	Decode a block of data containing a modified user defined
+	type specification.  TYPEDATA is a pointer to the block,
+	which consists of a two byte length, containing the size
+	of the rest of the block.  At the end of the block is a
+	four byte value that gives a reference to a user defined type.
+	Everything in between are type modifiers.
+
+	We simply compute the number of modifiers and call the general
+	function decode_modified_type to do the actual work.
+*/
+
+static struct type *
+DEFUN(decode_mod_u_d_type, (typedata), char *typedata)
+{
+  struct type *typep = NULL;
+  unsigned short modcount;
+  unsigned char *modifiers;
+  
+  /* Get the total size of the block, exclusive of the size itself */
+  (void) memcpy (&modcount, typedata, sizeof (short));
+  /* Deduct the size of the reference type bytes at the end of the block. */
+  modcount -= sizeof (long);
+  /* Skip over the two size bytes at the beginning of the block. */
+  modifiers = typedata + sizeof (short);
+  /* Now do the actual decoding */
+  typep = decode_modified_type (modifiers, modcount, AT_mod_u_d_type);
+  return (typep);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	decode_modified_type -- decode modified user or fundamental type
+
+SYNOPSIS
+
+	static struct type *decode_modified_type (unsigned char *modifiers,
+	    unsigned short modcount, int mtype)
+
+DESCRIPTION
+
+	Decode a modified type, either a modified fundamental type or
+	a modified user defined type.  MODIFIERS is a pointer to the
+	block of bytes that define MODCOUNT modifiers.  Immediately
+	following the last modifier is a short containing the fundamental
+	type or a long containing the reference to the user defined
+	type.  Which one is determined by MTYPE, which is either
+	AT_mod_fund_type or AT_mod_u_d_type to indicate what modified
+	type we are generating.
+
+	We call ourself recursively to generate each modified type,`
+	until MODCOUNT reaches zero, at which point we have consumed
+	all the modifiers and generate either the fundamental type or
+	user defined type.  When the recursion unwinds, each modifier
+	is applied in turn to generate the full modified type.
+
+NOTES
+
+	If we find a modifier that we don't recognize, and it is not one
+	of those reserved for application specific use, then we issue a
+	warning and simply ignore the modifier.
+
+BUGS
+
+	We currently ignore MOD_const and MOD_volatile.  (FIXME)
+
+ */
+
+static struct type *
+DEFUN(decode_modified_type,
+      (modifiers, modcount, mtype),
+      unsigned char *modifiers AND unsigned short modcount AND int mtype)
+{
+  struct type *typep = NULL;
+  unsigned short fundtype;
+  DIEREF dieref;
+  unsigned char modifier;
+  
+  if (modcount == 0)
+    {
+      switch (mtype)
+	{
+	case AT_mod_fund_type:
+	  (void) memcpy (&fundtype, modifiers, sizeof (short));
+	  typep = decode_fund_type (fundtype);
+	  break;
+	case AT_mod_u_d_type:
+	  (void) memcpy (&dieref, modifiers, sizeof (DIEREF));
+	  if ((typep = lookup_utype (dieref)) == NULL)
+	    {
+	      typep = alloc_utype (dieref, NULL);
+	    }
+	  break;
+	default:
+	  SQUAWK (("botched modified type decoding (mtype 0x%x)", mtype));
+	  typep = builtin_type_int;
+	  break;
+	}
+    }
+  else
+    {
+      modifier = *modifiers++;
+      typep = decode_modified_type (modifiers, --modcount, mtype);
+      switch (modifier)
+	{
+	case MOD_pointer_to:
+	  typep = lookup_pointer_type (typep);
+	  break;
+	case MOD_reference_to:
+	  typep = lookup_reference_type (typep);
+	  break;
+	case MOD_const:
+	  SQUAWK (("type modifier 'const' ignored"));	/* FIXME */
+	  break;
+	case MOD_volatile:
+	  SQUAWK (("type modifier 'volatile' ignored"));	/* FIXME */
+	  break;
+	default:
+	  if (!(MOD_lo_user <= modifier && modifier <= MOD_hi_user))
+	    {
+	      SQUAWK (("unknown type modifier %u", modifier));
+	    }
+	  break;
+	}
+    }
+  return (typep);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	decode_fund_type -- translate basic DWARF type to gdb base type
+
+DESCRIPTION
+
+	Given an integer that is one of the fundamental DWARF types,
+	translate it to one of the basic internal gdb types and return
+	a pointer to the appropriate gdb type (a "struct type *").
+
+NOTES
+
+	If we encounter a fundamental type that we are unprepared to
+	deal with, and it is not in the range of those types defined
+	as application specific types, then we issue a warning and
+	treat the type as builtin_type_int.
+*/
+
+static struct type *
+DEFUN(decode_fund_type, (fundtype), unsigned short fundtype)
+{
+  struct type *typep = NULL;
+  
+  switch (fundtype)
+    {
+
+    case FT_void:
+      typep = builtin_type_void;
+      break;
+    
+    case FT_pointer:		/* (void *) */
+      typep = lookup_pointer_type (builtin_type_void);
+      break;
+    
+    case FT_char:
+    case FT_signed_char:
+      typep = builtin_type_char;
+      break;
+    
+    case FT_short:
+    case FT_signed_short:
+      typep = builtin_type_short;
+      break;
+    
+    case FT_integer:
+    case FT_signed_integer:
+    case FT_boolean:		/* Was FT_set in AT&T version */
+      typep = builtin_type_int;
+      break;
+    
+    case FT_long:
+    case FT_signed_long:
+      typep = builtin_type_long;
+      break;
+    
+    case FT_float:
+      typep = builtin_type_float;
+      break;
+    
+    case FT_dbl_prec_float:
+      typep = builtin_type_double;
+      break;
+    
+    case FT_unsigned_char:
+      typep = builtin_type_unsigned_char;
+      break;
+    
+    case FT_unsigned_short:
+      typep = builtin_type_unsigned_short;
+      break;
+    
+    case FT_unsigned_integer:
+      typep = builtin_type_unsigned_int;
+      break;
+    
+    case FT_unsigned_long:
+      typep = builtin_type_unsigned_long;
+      break;
+    
+    case FT_ext_prec_float:
+      typep = builtin_type_long_double;
+      break;
+    
+    case FT_complex:
+      typep = builtin_type_complex;
+      break;
+    
+    case FT_dbl_prec_complex:
+      typep = builtin_type_double_complex;
+      break;
+    
+    case FT_long_long:
+    case FT_signed_long_long:
+      typep = builtin_type_long_long;
+      break;
+
+    case FT_unsigned_long_long:
+      typep = builtin_type_unsigned_long_long;
+      break;
+
+    }
+
+  if ((typep == NULL) && !(FT_lo_user <= fundtype && fundtype <= FT_hi_user))
+    {
+      SQUAWK (("unexpected fundamental type 0x%x", fundtype));
+      typep = builtin_type_void;
+    }
+    
+  return (typep);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	create_name -- allocate a fresh copy of a string on an obstack
+
+DESCRIPTION
+
+	Given a pointer to a string and a pointer to an obstack, allocates
+	a fresh copy of the string on the specified obstack.
+
+*/
+
+static char *
+DEFUN(create_name, (name, obstackp), char *name AND struct obstack *obstackp)
+{
+  int length;
+  char *newname;
+
+  length = strlen (name) + 1;
+  newname = (char *) obstack_alloc (obstackp, length);
+  (void) strcpy (newname, name);
+  return (newname);
+}
+
+/*
+
+LOCAL FUNCTION
+
+	basicdieinfo -- extract the minimal die info from raw die data
+
+SYNOPSIS
+
+	void basicdieinfo (char *diep, struct dieinfo *dip)
+
+DESCRIPTION
+
+	Given a pointer to raw DIE data, and a pointer to an instance of a
+	die info structure, this function extracts the basic information
+	from the DIE data required to continue processing this DIE, along
+	with some bookkeeping information about the DIE.
+
+	The information we absolutely must have includes the DIE tag,
+	and the DIE length.  If we need the sibling reference, then we
+	will have to call completedieinfo() to process all the remaining
+	DIE information.
+
+	Note that since there is no guarantee that the data is properly
+	aligned in memory for the type of access required (indirection
+	through anything other than a char pointer), we use memcpy to
+	shuffle data items larger than a char.  Possibly inefficient, but
+	quite portable.
+
+	We also take care of some other basic things at this point, such
+	as ensuring that the instance of the die info structure starts
+	out completely zero'd and that curdie is initialized for use
+	in error reporting if we have a problem with the current die.
+
+NOTES
+
+	All DIE's must have at least a valid length, thus the minimum
+	DIE size is sizeof (long).  In order to have a valid tag, the
+	DIE size must be at least sizeof (short) larger, otherwise they
+	are forced to be TAG_padding DIES.
+
+	Padding DIES must be at least sizeof(long) in length, implying that
+	if a padding DIE is used for alignment and the amount needed is less
+	than sizeof(long) then the padding DIE has to be big enough to align
+	to the next alignment boundry.
+ */
+
+static void
+DEFUN(basicdieinfo, (dip, diep), struct dieinfo *dip AND char *diep)
+{
+  curdie = dip;
+  (void) memset (dip, 0, sizeof (struct dieinfo));
+  dip -> die = diep;
+  dip -> dieref = dbroff + (diep - dbbase);
+  (void) memcpy (&dip -> dielength, diep, sizeof (long));
+  if (dip -> dielength < sizeof (long))
+    {
+      dwarfwarn ("malformed DIE, bad length (%d bytes)", dip -> dielength);
+    }
+  else if (dip -> dielength < (sizeof (long) + sizeof (short)))
+    {
+      dip -> dietag = TAG_padding;
+    }
+  else
+    {
+      (void) memcpy (&dip -> dietag, diep + sizeof (long), sizeof (short));
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	completedieinfo -- finish reading the information for a given DIE
+
+SYNOPSIS
+
+	void completedieinfo (struct dieinfo *dip)
+
+DESCRIPTION
+
+	Given a pointer to an already partially initialized die info structure,
+	scan the raw DIE data and finish filling in the die info structure
+	from the various attributes found.
+   
+	Note that since there is no guarantee that the data is properly
+	aligned in memory for the type of access required (indirection
+	through anything other than a char pointer), we use memcpy to
+	shuffle data items larger than a char.  Possibly inefficient, but
+	quite portable.
+
+NOTES
+
+	Each time we are called, we increment the diecount variable, which
+	keeps an approximate count of the number of dies processed for
+	each compilation unit.  This information is presented to the user
+	if the info_verbose flag is set.
+
+ */
+
+static void
+DEFUN(completedieinfo, (dip), struct dieinfo *dip)
+{
+  char *diep;			/* Current pointer into raw DIE data */
+  char *end;			/* Terminate DIE scan here */
+  unsigned short attr;		/* Current attribute being scanned */
+  unsigned short form;		/* Form of the attribute */
+  short block2sz;		/* Size of a block2 attribute field */
+  long block4sz;		/* Size of a block4 attribute field */
+  
+  diecount++;
+  diep = dip -> die;
+  end = diep + dip -> dielength;
+  diep += sizeof (long) + sizeof (short);
+  while (diep < end)
+    {
+      (void) memcpy (&attr, diep, sizeof (short));
+      diep += sizeof (short);
+      switch (attr)
+	{
+	case AT_fund_type:
+	  (void) memcpy (&dip -> at_fund_type, diep, sizeof (short));
+	  break;
+	case AT_ordering:
+	  (void) memcpy (&dip -> at_ordering, diep, sizeof (short));
+	  break;
+	case AT_bit_offset:
+	  (void) memcpy (&dip -> at_bit_offset, diep, sizeof (short));
+	  break;
+	case AT_visibility:
+	  (void) memcpy (&dip -> at_visibility, diep, sizeof (short));
+	  break;
+	case AT_sibling:
+	  (void) memcpy (&dip -> at_sibling, diep, sizeof (long));
+	  break;
+	case AT_stmt_list:
+	  (void) memcpy (&dip -> at_stmt_list, diep, sizeof (long));
+	  dip -> at_stmt_list_p = 1;
+	  break;
+	case AT_low_pc:
+	  (void) memcpy (&dip -> at_low_pc, diep, sizeof (long));
+	  break;
+	case AT_high_pc:
+	  (void) memcpy (&dip -> at_high_pc, diep, sizeof (long));
+	  break;
+	case AT_language:
+	  (void) memcpy (&dip -> at_language, diep, sizeof (long));
+	  break;
+	case AT_user_def_type:
+	  (void) memcpy (&dip -> at_user_def_type, diep, sizeof (long));
+	  break;
+	case AT_byte_size:
+	  (void) memcpy (&dip -> at_byte_size, diep, sizeof (long));
+	  break;
+	case AT_bit_size:
+	  (void) memcpy (&dip -> at_bit_size, diep, sizeof (long));
+	  break;
+	case AT_member:
+	  (void) memcpy (&dip -> at_member, diep, sizeof (long));
+	  break;
+	case AT_discr:
+	  (void) memcpy (&dip -> at_discr, diep, sizeof (long));
+	  break;
+	case AT_import:
+	  (void) memcpy (&dip -> at_import, diep, sizeof (long));
+	  break;
+	case AT_location:
+	  dip -> at_location = diep;
+	  break;
+	case AT_mod_fund_type:
+	  dip -> at_mod_fund_type = diep;
+	  break;
+	case AT_subscr_data:
+	  dip -> at_subscr_data = diep;
+	  break;
+	case AT_mod_u_d_type:
+	  dip -> at_mod_u_d_type = diep;
+	  break;
+	case AT_deriv_list:
+	  dip -> at_deriv_list = diep;
+	  break;
+	case AT_element_list:
+	  dip -> at_element_list = diep;
+	  break;
+	case AT_discr_value:
+	  dip -> at_discr_value = diep;
+	  break;
+	case AT_string_length:
+	  dip -> at_string_length = diep;
+	  break;
+	case AT_name:
+	  dip -> at_name = diep;
+	  break;
+	case AT_comp_dir:
+	  dip -> at_comp_dir = diep;
+	  break;
+	case AT_producer:
+	  dip -> at_producer = diep;
+	  break;
+	case AT_loclist:
+	  (void) memcpy (&dip -> at_loclist, diep, sizeof (long));
+	  break;
+	case AT_frame_base:
+	  (void) memcpy (&dip -> at_frame_base, diep, sizeof (long));
+	  break;
+	case AT_incomplete:
+	  (void) memcpy (&dip -> at_incomplete, diep, sizeof (short));
+	  break;
+	case AT_start_scope:
+	  (void) memcpy (&dip -> at_start_scope, diep, sizeof (long));
+	  break;
+	case AT_stride_size:
+	  (void) memcpy (&dip -> at_stride_size, diep, sizeof (long));
+	  break;
+	case AT_src_info:
+	  (void) memcpy (&dip -> at_src_info, diep, sizeof (long));
+	  break;
+	case AT_prototyped:
+	  (void) memcpy (&dip -> at_prototyped, diep, sizeof (short));
+	  break;
+	case AT_const_data:
+	  dip -> at_const_data = diep;
+	  break;
+	case AT_is_external:
+	  (void) memcpy (&dip -> at_is_external, diep, sizeof (short));
+	  dip -> at_is_external_p = 1;
+	  break;
+	default:
+	  /* Found an attribute that we are unprepared to handle.  However
+	     it is specifically one of the design goals of DWARF that
+	     consumers should ignore unknown attributes.  As long as the
+	     form is one that we recognize (so we know how to skip it),
+	     we can just ignore the unknown attribute. */
+	  break;
+	}
+      form = attr & 0xF;
+      switch (form)
+	{
+	case FORM_DATA2:
+	  diep += sizeof (short);
+	  break;
+	case FORM_DATA4:
+	  diep += sizeof (long);
+	  break;
+	case FORM_DATA8:
+	  diep += 8 * sizeof (char);	/* sizeof (long long) ? */
+	  break;
+	case FORM_ADDR:
+	case FORM_REF:
+	  diep += sizeof (long);
+	  break;
+	case FORM_BLOCK2:
+	  (void) memcpy (&block2sz, diep, sizeof (short));
+	  block2sz += sizeof (short);
+	  diep += block2sz;
+	  break;
+	case FORM_BLOCK4:
+	  (void) memcpy (&block4sz, diep, sizeof (long));
+	  block4sz += sizeof (long);
+	  diep += block4sz;
+	  break;
+	case FORM_STRING:
+	  diep += strlen (diep) + 1;
+	  break;
+	default:
+	  SQUAWK (("unknown attribute form (0x%x), skipped rest", form));
+	  diep = end;
+	  break;
+	}
+    }
+}
diff --git a/gdb/elfread.c b/gdb/elfread.c
new file mode 100644
index 0000000..8c8e8c0
--- /dev/null
+++ b/gdb/elfread.c
@@ -0,0 +1,208 @@
+/* Read ELF (Executable and Linking Format) object files for GDB.
+   Copyright (C) 1991 Free Software Foundation, Inc.
+   Written by Fred Fish at 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/************************************************************************
+ *									*
+ *				NOTICE					*
+ *									*
+ * This file is still under construction.  When it is complete, this	*
+ * notice will be removed.  Until then, direct any questions or changes	*
+ * to Fred Fish at Cygnus Support (fnf@cygint)				*
+ *									* 
+ * FIXME	Still needs support for shared libraries.		*
+ * FIXME	Still needs support for core files.			*
+ * FIXME	The ".debug" and ".line" section names are hardwired.	*
+ * FIXME	Still needs support ELF symbol tables (as distinct	*
+ *		from DWARF support).  Can use them to build the misc	*
+ *		function vector at least.  This is fairly trivial once	*
+ *		bfd is extended to handle ELF symbol tables.		*
+ *									*
+ ************************************************************************/
+
+#include <stdio.h>
+
+#include "defs.h"
+#include "param.h"
+#include "elf-common.h"
+#include "elf-external.h"
+#include "elf-internal.h"
+#include "bfd.h"
+#include "symfile.h"
+#include "symtab.h"
+#include "ansidecl.h"
+
+extern int EXFUN(strcmp, (CONST char *a, CONST char *b));
+#define STREQ(a,b) (strcmp((a),(b))==0)
+
+struct elfinfo {
+  unsigned int dboffset;	/* Offset to dwarf debug section */
+  unsigned int dbsize;		/* Size of dwarf debug section */
+  unsigned int lnoffset;	/* Offset to dwarf line number section */
+  unsigned int lnsize;		/* Size of dwarf line number section */
+};
+
+/* FIXME - crude hack to resolve undefined global.  This function is
+   part of support for corefiles, which is not yet implemented. */
+
+unsigned int
+DEFUN(register_addr, (regno, blockend),
+      int regno AND
+      int blockend)
+{
+	error ("Fetching registers from corefiles unimplemented.");
+}
+
+/* We are called once per section from elf_symfile_read.  We
+   need to examine each section we are passed, check to see
+   if it is something we are interested in processing, and
+   if so, stash away some access information for the section.
+
+   For now we recognize the dwarf debug information sections and
+   line number sections from matching their section names.  The
+   ELF definition is no real help here since it has no direct
+   knowledge of DWARF (by design, so any debugging format can be
+   used).
+
+   FIXME:  The section names should not be hardwired strings. */
+
+static void
+DEFUN(elf_locate_sections, (abfd, sectp, ei),
+      bfd *abfd AND
+      asection *sectp AND
+      struct elfinfo *ei)
+{
+  if (STREQ (sectp -> name, ".debug"))
+    {
+      ei -> dboffset = sectp -> filepos;
+      ei -> dbsize = sectp -> size;
+    }
+  else if (STREQ (sectp -> name, ".line"))
+    {
+      ei -> lnoffset = sectp -> filepos;
+      ei -> lnsize = sectp -> size;
+    }
+}
+
+/* Scan and build partial symbols for a symbol file.
+   We have been initialized by a call to elf_symfile_init, which 
+   currently does nothing.
+
+   ADDR is the address relative to which the symbols in it are (e.g.
+   the base address of the text segment).
+
+   MAINLINE is true if we are reading the main symbol
+   table (as opposed to a shared lib or dynamically loaded file).
+
+   This function only does the minimum work necessary for letting the
+   user "name" things symbolically; it does not read the entire symtab.
+   Instead, it reads the external and static symbols and puts them in partial
+   symbol tables.  When more extensive information is requested of a
+   file, the corresponding partial symbol table is mutated into a full
+   fledged symbol table by going back and reading the symbols
+   for real.  The function dwarf_psymtab_to_symtab() is the function that
+   does this for DWARF symbols. */
+
+static void
+DEFUN(elf_symfile_read, (sf, addr, mainline),
+      struct sym_fns *sf AND
+      CORE_ADDR addr AND
+      int mainline)
+{
+  bfd *abfd = sf -> sym_bfd;
+  struct elfinfo ei;
+
+  bfd_map_over_sections (abfd, elf_locate_sections, &ei);
+  if (ei.dboffset && ei.lnoffset)
+    {
+      addr = 0;	/* FIXME: force address base to zero for now */
+      dwarf_build_psymtabs (fileno ((FILE *)(abfd -> iostream)),
+			    bfd_get_filename (abfd),
+			    addr, mainline,
+			    ei.dboffset, ei.dbsize,
+			    ei.lnoffset, ei.lnsize);
+    }
+  if (!partial_symtab_list)
+    {
+      wrap_here ("");
+      printf_filtered ("(no debugging symbols found)...");
+      wrap_here ("");
+    }
+}
+
+/* Initialize anything that needs initializing when a completely new symbol
+   file is specified (not just adding some symbols from another file, e.g. a
+   shared library).
+
+   For now at least, we have nothing in particular to do, so this function is
+   just a stub. */
+
+static void
+DEFUN_VOID (elf_new_init)
+{
+}
+
+/* ELF specific initialization routine for reading symbols.
+
+   It is passed a pointer to a struct sym_fns which contains, among other
+   things, the BFD for the file whose symbols are being read, and a slot for
+   a pointer to "private data" which we can fill with goodies.
+
+   For now at least, we have nothing in particular to do, so this function is
+   just a stub. */
+
+static void
+DEFUN(elf_symfile_init, (sf),
+      struct sym_fns *sf)
+{
+}
+
+
+/*  Register that we are able to handle ELF object file formats and DWARF
+    debugging formats.
+
+    Unlike other object file formats, where the debugging information format
+    is implied by the object file format, the ELF object file format and the
+    DWARF debugging information format are two distinct, and potentially
+    separate entities.  I.E. it is perfectly possible to have ELF objects
+    with debugging formats other than DWARF.  And it is conceivable that the
+    DWARF debugging format might be used with another object file format,
+    like COFF, by simply using COFF's custom section feature.
+
+    GDB, and to a lesser extent BFD, should support the notion of separate
+    object file formats and debugging information formats.  For now, we just
+    use "elf" in the same sense as "a.out" or "coff", to imply both the ELF
+    object file format and the DWARF debugging format. */
+
+static struct sym_fns elf_sym_fns = {
+  "elf",		/* sym_name: name or name prefix of BFD target type */
+  3,			/* sym_namelen: number of significant sym_name chars */
+  elf_new_init,		/* sym_new_init: init anything gbl to entire symtab */
+  elf_symfile_init,	/* sym_init: read initial info, setup for sym_read() */
+  elf_symfile_read,	/* sym_read: read a symbol file into symtab */
+  NULL,			/* sym_bfd: accessor for symbol file being read */
+  NULL,			/* sym_private: sym_init & sym_read shared info */
+  NULL			/* next: pointer to next struct sym_fns */
+};
+
+void
+DEFUN_VOID (_initialize_elfread)
+{
+  add_symtab_fns (&elf_sym_fns);
+}
diff --git a/gdb/procfs.c b/gdb/procfs.c
new file mode 100644
index 0000000..a277369
--- /dev/null
+++ b/gdb/procfs.c
@@ -0,0 +1,988 @@
+/* Machine independent support for SVR4 /proc (process file system) for GDB.
+   Copyright (C) 1991 Free Software Foundation, Inc.
+   Written by Fred Fish at 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+/*			N  O  T  E  S
+
+For information on the details of using /proc consult section proc(4)
+in the UNIX System V Release 4 System Administrator's Reference Manual.
+
+The general register and floating point register sets are manipulated by
+separate ioctl's.  This file makes the assumption that if FP0_REGNUM is
+defined, then support for the floating point register set is desired,
+regardless of whether or not the actual target has floating point hardware.
+
+ */
+
+
+
+#include "param.h"
+
+#ifdef USE_PROC_FS	/* Entire file goes away if not using /proc */
+
+#include <stdio.h>
+#include <sys/procfs.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "defs.h"
+#include "ansidecl.h"
+#include "inferior.h"
+#include "target.h"
+
+#ifndef PROC_NAME_FMT
+#define PROC_NAME_FMT "/proc/%d"
+#endif
+
+extern void EXFUN(supply_gregset, (gregset_t *gregsetp));
+extern void EXFUN(fill_gregset, (gregset_t *gresetp, int regno));
+
+#if defined (FP0_REGNUM)
+extern void EXFUN(supply_fpregset, (fpregset_t *fpregsetp));
+extern void EXFUN(fill_fpregset, (fpregset_t *fpresetp, int regno));
+#endif
+
+#if 1	/* FIXME: Gross and ugly hack to resolve coredep.c global */
+CORE_ADDR kernel_u_addr;
+#endif
+
+/*  All access to the inferior, either one started by gdb or one that has
+    been attached to, is controlled by an instance of a procinfo structure,
+    defined below.  Since gdb currently only handles one inferior at a time,
+    the procinfo structure is statically allocated and only one exists at
+    any given time. */
+
+struct procinfo {
+  int valid;			/* Nonzero if pid, fd, & pathname are valid */
+  int pid;			/* Process ID of inferior */
+  int fd;			/* File descriptor for /proc entry */
+  char *pathname;		/* Pathname to /proc entry */
+  int was_stopped;		/* Nonzero if was stopped prior to attach */
+  prrun_t prrun;		/* Control state when it is run */
+  prstatus_t prstatus;		/* Current process status info */
+  gregset_t gregset;		/* General register set */
+  fpregset_t fpregset;		/* Floating point register set */
+  fltset_t fltset;		/* Current traced hardware fault set */
+  sigset_t trace;		/* Current traced signal set */
+  sysset_t exitset;		/* Current traced system call exit set */
+  sysset_t entryset;		/* Current traced system call entry set */
+} pi;
+
+/* Forward declarations of static functions so we don't have to worry
+   about ordering within this file.  The EXFUN macro may be slightly
+   misleading.  Should probably be called DCLFUN instead, or something
+   more intuitive, since it can be used for both static and external
+   definitions. */
+
+static void EXFUN(proc_init_failed, (char *why));
+static int EXFUN(open_proc_file, (int pid));
+static void EXFUN(close_proc_file, (void));
+static void EXFUN(unconditionally_kill_inferior, (void));
+
+/*
+
+GLOBAL FUNCTION
+
+	ptrace -- override library version to force errors for /proc version
+
+SYNOPSIS
+
+	int ptrace (int request, int pid, int arg3, int arg4)
+
+DESCRIPTION
+
+	When gdb is configured to use /proc, it should not be calling
+	or otherwise attempting to use ptrace.  In order to catch errors
+	where use of /proc is configured, but some routine is still calling
+	ptrace, we provide a local version of a function with that name
+	that does nothing but issue an error message.
+*/
+
+int
+DEFUN(ptrace, (request, pid, arg3, arg4),
+      int request AND
+      int pid AND
+      int arg3 AND
+      int arg4)
+{
+  error ("internal error - there is a call to ptrace() somewhere");
+  /*NOTREACHED*/
+}
+
+/*
+
+GLOBAL FUNCTION
+
+	kill_inferior_fast -- kill inferior while gdb is exiting
+
+SYNOPSIS
+
+	void kill_inferior_fast (void)
+
+DESCRIPTION
+
+	This is used when GDB is exiting.  It gives less chance of error.
+
+NOTES
+
+	Don't attempt to kill attached inferiors since we may be called
+	when gdb is in the process of aborting, and killing the attached
+	inferior may be very anti-social.  This is particularly true if we
+	were attached just so we could use the /proc facilities to get
+	detailed information about it's status.
+
+*/
+
+void
+DEFUN_VOID(kill_inferior_fast)
+{
+  if (inferior_pid != 0 && !attach_flag)
+    {
+      unconditionally_kill_inferior ();
+    }
+}
+
+/*
+
+GLOBAL FUNCTION
+
+	kill_inferior - kill any currently inferior
+
+SYNOPSIS
+
+	void kill_inferior (void)
+
+DESCRIPTION
+
+	Kill any current inferior.
+
+NOTES
+
+	Kills even attached inferiors.  Presumably the user has already
+	been prompted that the inferior is an attached one rather than
+	one started by gdb.  (FIXME?)
+
+*/
+
+void
+DEFUN_VOID(kill_inferior)
+{
+  if (inferior_pid != 0)
+    {
+      unconditionally_kill_inferior ();
+      target_mourn_inferior ();
+    }
+}
+
+/*
+
+LOCAL FUNCTION
+
+	unconditionally_kill_inferior - terminate the inferior
+
+SYNOPSIS
+
+	static void unconditionally_kill_inferior (void)
+
+DESCRIPTION
+
+	Kill the current inferior.  Should not be called until it
+	is at least tested that there is an inferior.
+
+NOTE
+
+	A possibly useful enhancement would be to first try sending
+	the inferior a terminate signal, politely asking it to commit
+	suicide, before we murder it.
+
+*/
+
+static void
+DEFUN_VOID(unconditionally_kill_inferior)
+{
+  int signo;
+  
+  signo = SIGKILL;
+  (void) ioctl (pi.fd, PIOCKILL, &signo);
+  close_proc_file ();
+  wait ((int *) 0);
+}
+
+/*
+
+GLOBAL FUNCTION
+
+	child_xfer_memory -- copy data to or from inferior memory space
+
+SYNOPSIS
+
+	int child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
+		int dowrite, struct target_ops target)
+
+DESCRIPTION
+
+	Copy LEN bytes to/from inferior's memory starting at MEMADDR
+	from/to debugger memory starting at MYADDR.  Copy from inferior
+	if DOWRITE is zero or to inferior if DOWRITE is nonzero.
+  
+	Returns the length copied, which is either the LEN argument or
+	zero.  This xfer function does not do partial moves, since child_ops
+	doesn't allow memory operations to cross below us in the target stack
+	anyway.
+
+NOTES
+
+	The /proc interface makes this an almost trivial task.
+ */
+
+
+int
+DEFUN(child_xfer_memory, (memaddr, myaddr, len, dowrite, target),
+      CORE_ADDR memaddr AND
+      char *myaddr AND
+      int len AND
+      int dowrite AND
+      struct target_ops target /* ignored */)
+{
+  int nbytes = 0;
+
+  if (lseek (pi.fd, (off_t) memaddr, 0) == (off_t) memaddr)
+    {
+      if (dowrite)
+	{
+	  nbytes = write (pi.fd, myaddr, len);
+	}
+      else
+	{
+	  nbytes = read (pi.fd, myaddr, len);
+	}
+      if (nbytes < 0)
+	{
+	  nbytes = 0;
+	}
+    }
+  return (nbytes);
+}
+
+/*
+
+GLOBAL FUNCTION
+
+	store_inferior_registers -- copy register values back to inferior
+
+SYNOPSIS
+
+	void store_inferior_registers (int regno)
+
+DESCRIPTION
+
+	Store our current register values back into the inferior.  If
+	REGNO is -1 then store all the register, otherwise store just
+	the value specified by REGNO.
+
+NOTES
+
+	If we are storing only a single register, we first have to get all
+	the current values from the process, overwrite the desired register
+	in the gregset with the one we want from gdb's registers, and then
+	send the whole set back to the process.  For writing all the
+	registers, all we have to do is generate the gregset and send it to
+	the process.
+
+	Also note that the process has to be stopped on an event of interest
+	for this to work, which basically means that it has to have been
+	run under the control of one of the other /proc ioctl calls and not
+	ptrace.  Since we don't use ptrace anyway, we don't worry about this
+	fine point, but it is worth noting for future reference.
+
+	Gdb is confused about what this function is supposed to return.
+	Some versions return a value, others return nothing.  Some are
+	declared to return a value and actually return nothing.  Gdb ignores
+	anything returned.  (FIXME)
+
+ */
+
+void
+DEFUN(store_inferior_registers, (regno),
+      int regno)
+{
+  if (regno != -1)
+    {
+      (void) ioctl (pi.fd, PIOCGREG, &pi.gregset);
+    }
+  fill_gregset (&pi.gregset, regno);
+  (void) ioctl (pi.fd, PIOCSREG, &pi.gregset);
+
+#if defined (FP0_REGNUM)
+
+  /* Now repeat everything using the floating point register set, if the
+     target has floating point hardware. Since we ignore the returned value,
+     we'll never know whether it worked or not anyway. */
+
+  if (regno != -1)
+    {
+      (void) ioctl (pi.fd, PIOCGFPREG, &pi.fpregset);
+    }
+  fill_fpregset (&pi.fpregset, regno);
+  (void) ioctl (pi.fd, PIOCSFPREG, &pi.fpregset);
+
+#endif	/* FP0_REGNUM */
+
+}
+
+/*
+
+GLOBAL FUNCTION
+
+	inferior_proc_init - initialize access to a /proc entry
+
+SYNOPSIS
+
+	void inferior_proc_init (int pid)
+
+DESCRIPTION
+
+	When gdb starts an inferior, this function is called in the parent
+	process immediately after the fork.  It waits for the child to stop
+	on the return from the exec system call (the child itself takes care
+	of ensuring that this is set up), then sets up the set of signals
+	and faults that are to be traced.
+
+NOTES
+
+	If proc_init_failed ever gets called, control returns to the command
+	processing loop via the standard error handling code.
+ */
+
+void
+DEFUN(inferior_proc_init, (int pid),
+      int pid)
+{
+  if (!open_proc_file (pid))
+    {
+      proc_init_failed ("can't open process file");
+    }
+  else
+    {
+      (void) memset (&pi.prrun, 0, sizeof (pi.prrun));
+      prfillset (&pi.prrun.pr_trace);
+      prfillset (&pi.prrun.pr_fault);
+      prdelset (&pi.prrun.pr_fault, FLTPAGE);
+      if (ioctl (pi.fd, PIOCWSTOP, &pi.prstatus) < 0)
+	{
+	  proc_init_failed ("PIOCWSTOP failed");
+	}
+      else if (ioctl (pi.fd, PIOCSTRACE, &pi.prrun.pr_trace) < 0)
+	{
+	  proc_init_failed ("PIOCSTRACE failed");
+	}
+      else if (ioctl (pi.fd, PIOCSFAULT, &pi.prrun.pr_fault) < 0)
+	{
+	  proc_init_failed ("PIOCSFAULT failed");
+	}
+    }
+}
+
+/*
+
+GLOBAL FUNCTION
+
+	proc_set_exec_trap -- arrange for exec'd child to halt at startup
+
+SYNOPSIS
+
+	void proc_set_exec_trap (void)
+
+DESCRIPTION
+
+	This function is called in the child process when starting up
+	an inferior, prior to doing the exec of the actual inferior.
+	It sets the child process's exitset to make exit from the exec
+	system call an event of interest to stop on, and then simply
+	returns.  The child does the exec, the system call returns, and
+	the child stops at the first instruction, ready for the gdb
+	parent process to take control of it.
+
+NOTE
+
+	We need to use all local variables since the child may be sharing
+	it's data space with the parent, if vfork was used rather than
+	fork.
+ */
+
+void
+DEFUN_VOID(proc_set_exec_trap)
+{
+  sysset_t exitset;
+  auto char procname[32];
+  int fd;
+  
+  (void) sprintf (procname, PROC_NAME_FMT, getpid ());
+  if ((fd = open (procname, O_RDWR)) < 0)
+    {
+      perror (procname);
+      fflush (stderr);
+      _exit (127);
+    }
+  premptyset (&exitset);
+  praddset (&exitset, SYS_exec);
+  praddset (&exitset, SYS_execve);
+  if (ioctl (fd, PIOCSEXIT, &exitset) < 0)
+    {
+      perror (procname);
+      fflush (stderr);
+      _exit (127);
+    }
+}
+
+
+#ifdef ATTACH_DETACH
+
+/*
+
+GLOBAL FUNCTION
+
+	attach -- attach to an already existing process
+
+SYNOPSIS
+
+	int attach (int pid)
+
+DESCRIPTION
+
+	Attach to an already existing process with the specified process
+	id.  If the process is not already stopped, query whether to
+	stop it or not.
+
+NOTES
+
+	The option of stopping at attach time is specific to the /proc
+	versions of gdb.  Versions using ptrace force the attachee
+	to stop.
+
+*/
+
+int
+DEFUN(attach, (pid),
+      int pid)
+{
+  if (!open_proc_file (pid))
+    {
+      perror_with_name (pi.pathname);
+      /* NOTREACHED */
+    }
+  
+  /*  Get current status of process and if it is not already stopped,
+      then stop it.  Remember whether or not it was stopped when we first
+      examined it. */
+  
+  if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0)
+    {
+      print_sys_errmsg (pi.pathname, errno);
+      close_proc_file ();
+      error ("PIOCSTATUS failed");
+    }
+  if (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
+    {
+      pi.was_stopped = 1;
+    }
+  else
+    {
+      pi.was_stopped = 0;
+      if (query ("Process is currently running, stop it? "))
+	{
+	  if (ioctl (pi.fd, PIOCSTOP, &pi.prstatus) < 0)
+	    {
+	      print_sys_errmsg (pi.pathname, errno);
+	      close_proc_file ();
+	      error ("PIOCSTOP failed");
+	    }
+	}
+    }
+  
+  /*  Remember some things about the inferior that we will, or might, change
+      so that we can restore them when we detach. */
+  
+  (void) ioctl (pi.fd, PIOCGTRACE, &pi.trace);
+  (void) ioctl (pi.fd, PIOCGFAULT, &pi.fltset);
+  (void) ioctl (pi.fd, PIOCGENTRY, &pi.entryset);
+  (void) ioctl (pi.fd, PIOCGEXIT, &pi.exitset);
+  
+  /* Set up trace and fault sets, as gdb expects them. */
+  
+  (void) memset (&pi.prrun, 0, sizeof (pi.prrun));
+  prfillset (&pi.prrun.pr_trace);
+  prfillset (&pi.prrun.pr_fault);
+  prdelset (&pi.prrun.pr_fault, FLTPAGE);
+  if (ioctl (pi.fd, PIOCSFAULT, &pi.prrun.pr_fault))
+    {
+      print_sys_errmsg ("PIOCSFAULT failed");
+    }
+  if (ioctl (pi.fd, PIOCSTRACE, &pi.prrun.pr_trace))
+    {
+      print_sys_errmsg ("PIOCSTRACE failed");
+    }
+  attach_flag = 1;
+  return (pid);
+}
+
+/*
+
+GLOBAL FUNCTION
+
+	detach -- detach from an attached-to process
+
+SYNOPSIS
+
+	void detach (int signal)
+
+DESCRIPTION
+
+	Detach from the current attachee.
+
+	If signal is non-zero, the attachee is started running again and sent
+	the specified signal.
+
+	If signal is zero and the attachee was not already stopped when we
+	attached to it, then we make it runnable again when we detach.
+
+	Otherwise, we query whether or not to make the attachee runnable
+	again, since we may simply want to leave it in the state it was in
+	when we attached.
+
+	We report any problems, but do not consider them errors, since we
+	MUST detach even if some things don't seem to go right.  This may not
+	be the ideal situation.  (FIXME).
+ */
+
+void
+DEFUN(detach, (signal),
+      int signal)
+{
+  if (signal)
+    {
+      struct siginfo siginfo;
+      siginfo.si_signo = signal;
+      siginfo.si_code = 0;
+      siginfo.si_errno = 0;
+      if (ioctl (pi.fd, PIOCSSIG, &siginfo) < 0)
+	{
+	  print_sys_errmsg (pi.pathname, errno);
+	  printf ("PIOCSSIG failed.\n");
+	}
+    }
+  if (ioctl (pi.fd, PIOCSEXIT, &pi.exitset) < 0)
+    {
+      print_sys_errmsg (pi.pathname, errno);
+      printf ("PIOCSEXIT failed.\n");
+    }
+  if (ioctl (pi.fd, PIOCSENTRY, &pi.entryset) < 0)
+    {
+      print_sys_errmsg (pi.pathname, errno);
+      printf ("PIOCSENTRY failed.\n");
+    }
+  if (ioctl (pi.fd, PIOCSTRACE, &pi.trace) < 0)
+    {
+      print_sys_errmsg (pi.pathname, errno);
+      printf ("PIOCSTRACE failed.\n");
+    }
+  if (ioctl (pi.fd, PIOCSFAULT, &pi.fltset) < 0)
+    {
+      print_sys_errmsg (pi.pathname, errno);
+      printf ("PIOCSFAULT failed.\n");
+    }
+  if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0)
+    {
+      print_sys_errmsg (pi.pathname, errno);
+      printf ("PIOCSTATUS failed.\n");
+    }
+  else
+    {
+      if (signal || (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
+	{
+	  if (signal || !pi.was_stopped ||
+	      query ("Was stopped when attached, make it runnable again? "))
+	    {
+	      (void) memset (&pi.prrun, 0, sizeof (pi.prrun));
+	      pi.prrun.pr_flags = PRCFAULT;
+	      if (ioctl (pi.fd, PIOCRUN, &pi.prrun))
+		{
+		  print_sys_errmsg (pi.pathname, errno);
+		  printf ("PIOCRUN failed.\n");
+		}
+	    }
+	}
+    }
+  close_proc_file ();
+  attach_flag = 0;
+}
+
+/*
+
+GLOBAL FUNCTION
+
+	proc_wait -- emulate wait() as much as possible
+
+SYNOPSIS
+
+	int proc_wait (int *statloc)
+
+DESCRIPTION
+
+	Try to emulate wait() as much as possible.  Not sure why we can't
+	just use wait(), but it seems to have problems when applied to a
+	process being controlled with the /proc interface.
+
+NOTES
+
+	We have a race problem here with no obvious solution.  We need to let
+	the inferior run until it stops on an event of interest, which means
+	that we need to use the PIOCWSTOP ioctl.  However, we cannot use this
+	ioctl if the process is already stopped on something that is not an
+	event of interest, or the call will hang indefinitely.  Thus we first
+	use PIOCSTATUS to see if the process is not stopped.  If not, then we
+	use PIOCWSTOP.  But during the window between the two, if the process
+	stops for any reason that is not an event of interest (such as a job
+	control signal) then gdb will hang.  One possible workaround is to set
+	an alarm to wake up every minute of so and check to see if the process
+	is still running, and if so, then reissue the PIOCWSTOP.  But this is
+	a real kludge, so has not been implemented.  FIXME: investigate
+	alternatives.
+
+	FIXME:  Investigate why wait() seems to have problems with programs
+	being control by /proc routines.
+
+ */
+
+int
+DEFUN(proc_wait, (statloc),
+      int *statloc)
+{
+  short what;
+  short why;
+  int statval = 0;
+  int checkerr = 0;
+  int rtnval = -1;
+  
+  if (ioctl (pi.fd, PIOCSTATUS, &pi.prstatus) < 0)
+    {
+      checkerr++;
+    }
+  else if (!(pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
+    {
+      if (ioctl (pi.fd, PIOCWSTOP, &pi.prstatus) < 0)
+	{
+	  checkerr++;
+	}
+    }    
+  if (checkerr)
+    {
+      if (errno == ENOENT)
+	{
+	  rtnval = wait (&statval);
+	  if (rtnval != inferior_pid)
+	    {
+	      error ("PIOCWSTOP, wait failed, returned %d", rtnval);
+	      /* NOTREACHED */
+	    }
+	}
+      else
+	{
+	  print_sys_errmsg (pi.pathname, errno);
+	  error ("PIOCSTATUS or PIOCWSTOP failed.");
+	  /* NOTREACHED */
+	}
+    }
+  else if (pi.prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
+    {
+      rtnval = pi.prstatus.pr_pid;
+      why = pi.prstatus.pr_why;
+      what = pi.prstatus.pr_what;
+      if (why == PR_SIGNALLED)
+	{
+	  statval = (what << 8) | 0177;
+	}
+      else if ((why == PR_SYSEXIT) &&
+	       (what == SYS_exec || what == SYS_execve))
+	{
+	  statval = (SIGTRAP << 8) | 0177;
+	}
+      else if (why == PR_REQUESTED)
+	{
+	  statval = (SIGSTOP << 8) | 0177;
+	}
+      else if (why == PR_JOBCONTROL)
+	{
+	  statval = (what << 8) | 0177;
+	}
+      else if (why == PR_FAULTED)
+	{
+	  switch (what)
+	    {
+	    case FLTPRIV:
+	    case FLTILL:
+	      statval = (SIGILL << 8) | 0177;
+	      break;
+	    case FLTBPT:
+	    case FLTTRACE:
+	      statval = (SIGTRAP << 8) | 0177;
+	      break;
+	    case FLTSTACK:
+	    case FLTACCESS:
+	    case FLTBOUNDS:
+	      statval = (SIGSEGV << 8) | 0177;
+	      break;
+	    case FLTIOVF:
+	    case FLTIZDIV:
+	    case FLTFPE:
+	      statval = (SIGFPE << 8) | 0177;
+	      break;
+	    case FLTPAGE:		/* Recoverable page fault */
+	    default:
+	      rtnval = -1;
+	      error ("PIOCWSTOP, unknown why %d, what %d", why, what);
+	      /* NOTREACHED */
+	    }
+	}
+      else
+	{
+	  rtnval = -1;
+	  error ("PIOCWSTOP, unknown why %d, what %d", why, what);
+	  /* NOTREACHED */
+	}
+    }
+  else
+    {
+      error ("PIOCWSTOP, stopped for unknown/unhandled reason, flags %#x", 
+	     pi.prstatus.pr_flags);
+	  /* NOTREACHED */
+    }
+  if (statloc)
+    {
+      *statloc = statval;
+    }
+  return (rtnval);
+}
+
+/*
+
+GLOBAL FUNCTION
+
+	child_resume -- resume execution of the inferior process
+
+SYNOPSIS
+
+	void child_resume (int step, int signal)
+
+DESCRIPTION
+
+	Resume execution of the inferior process.  If STEP is nozero, then
+	just single step it.  If SIGNAL is nonzero, restart it with that
+	signal activated.
+
+NOTE
+
+	It may not be absolutely necessary to specify the PC value for
+	restarting, but to be safe we use the value that gdb considers
+	to be current.  One case where this might be necessary is if the
+	user explicitly changes the PC value that gdb considers to be
+	current.  FIXME:  Investigate if this is necessary or not.
+ */
+
+void
+DEFUN(child_resume, (step, signal),
+      int step AND
+      int signal)
+{
+  errno = 0;
+  pi.prrun.pr_flags = PRSVADDR | PRSTRACE | PRSFAULT | PRCFAULT;
+  pi.prrun.pr_vaddr = (caddr_t) *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
+  if (signal)
+    {
+      if (signal != pi.prstatus.pr_cursig)
+	{
+	  struct siginfo siginfo;
+	  siginfo.si_signo = signal;
+	  siginfo.si_code = 0;
+	  siginfo.si_errno = 0;
+	  (void) ioctl (pi.fd, PIOCSSIG, &siginfo);
+	}
+    }
+  else
+    {
+      pi.prrun.pr_flags |= PRCSIG;
+    }
+  if (step)
+    {
+      pi.prrun.pr_flags |= PRSTEP;
+    }
+  if (ioctl (pi.fd, PIOCRUN, &pi.prrun) != 0)
+    {
+      perror_with_name (pi.pathname);
+      /* NOTREACHED */
+    }
+}
+
+/*
+
+GLOBAL FUNCTION
+
+	fetch_inferior_registers -- fetch current registers from inferior
+
+SYNOPSIS
+
+	void fetch_inferior_registers (void)
+
+DESCRIPTION
+
+	Read the current values of the inferior's registers, both the
+	general register set and floating point registers (if supported)
+	and update gdb's idea of their current values.
+
+*/
+
+void
+DEFUN_VOID(fetch_inferior_registers)
+{
+  if (ioctl (pi.fd, PIOCGREG, &pi.gregset) != -1)
+    {
+      supply_gregset (&pi.gregset);
+    }
+#if defined (FP0_REGNUM)
+  if (ioctl (pi.fd, PIOCGFPREG, &pi.fpregset) != -1)
+    {
+      supply_fpregset (&pi.fpregset);
+    }
+#endif
+}
+
+#endif	/* ATTACH_DETACH */
+
+/*
+
+LOCAL FUNCTION
+
+	proc_init_failed - called whenever /proc access initialization fails
+
+SYNOPSIS
+
+	static void proc_init_failed (char *why)
+
+DESCRIPTION
+
+	This function is called whenever initialization of access to a /proc
+	entry fails.  It prints a suitable error message, does some cleanup,
+	and then invokes the standard error processing routine which dumps
+	us back into the command loop.
+ */
+
+static void
+DEFUN(proc_init_failed, (why),
+      char *why)
+{
+  print_sys_errmsg (pi.pathname, errno);
+  (void) kill (pi.pid, SIGKILL);
+  close_proc_file ();
+  error (why);
+  /* NOTREACHED */
+}
+
+/*
+
+LOCAL FUNCTION
+
+	close_proc_file - close any currently open /proc entry
+
+SYNOPSIS
+
+	static void close_proc_file (void)
+
+DESCRIPTION
+
+	Close any currently open /proc entry and mark the process information
+	entry as invalid.  In order to ensure that we don't try to reuse any
+	stale information, the pid, fd, and pathnames are explicitly
+	invalidated, which may be overkill.
+
+ */
+
+static void
+DEFUN_VOID(close_proc_file)
+{
+  pi.pid = 0;
+  if (pi.valid)
+    {
+      (void) close (pi.fd);
+    }
+  pi.fd = -1;
+  if (pi.pathname)
+    {
+      free (pi.pathname);
+      pi.pathname = NULL;
+    }
+  pi.valid = 0;
+}
+
+/*
+
+LOCAL FUNCTION
+
+	open_proc_file - open a /proc entry for a given process id
+
+SYNOPSIS
+
+	static int open_proc_file (pid)
+
+DESCRIPTION
+
+	Given a process id, close the existing open /proc entry (if any)
+	and open one for the new process id.  Once it is open, then
+	mark the local process information structure as valid, which
+	guarantees that the pid, fd, and pathname fields match an open
+	/proc entry.  Returns zero if the open fails, nonzero otherwise.
+
+	Note that the pathname is left intact, even when the open fails,
+	so that callers can use it to construct meaningful error messages
+	rather than just "file open failed".
+ */
+
+static int
+DEFUN(open_proc_file, (pid),
+      int pid)
+{
+  pi.valid = 0;
+  if (pi.valid)
+    {
+      (void) close (pi.fd);
+    }
+  if (pi.pathname == NULL)
+    {
+      pi.pathname = xmalloc (32);
+    }
+  sprintf (pi.pathname, PROC_NAME_FMT, pid);
+  if ((pi.fd = open (pi.pathname, O_RDWR)) >= 0)
+    {
+      pi.valid = 1;
+      pi.pid = pid;
+    }
+  return (pi.valid);
+}
+
+#endif	/* USE_PROC_FS */
diff --git a/gdb/tm-amix.h b/gdb/tm-amix.h
new file mode 100644
index 0000000..056bd82
--- /dev/null
+++ b/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)))
+
diff --git a/gdb/tm-svr4.h b/gdb/tm-svr4.h
new file mode 100755
index 0000000..ed14214
--- /dev/null
+++ b/gdb/tm-svr4.h
@@ -0,0 +1,21 @@
+/* Macro definitions for GDB on all SVR4 target systems.
+   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.  */
+
+/* Currently empty */
diff --git a/gdb/xm-amix.h b/gdb/xm-amix.h
new file mode 100644
index 0000000..cf55ce1
--- /dev/null
+++ b/gdb/xm-amix.h
@@ -0,0 +1,28 @@
+/* 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.  */
+
+/* Pick up most of what we need from the generic m68k host include file. */
+
+#include "xm-m68k.h"
+
+/* Pick up more stuff from the generic SVR4 host include file. */
+
+#include "xm-svr4.h"
+
diff --git a/gdb/xm-m68k.h b/gdb/xm-m68k.h
new file mode 100644
index 0000000..f417e97
--- /dev/null
+++ b/gdb/xm-m68k.h
@@ -0,0 +1,22 @@
+/* Macro definitions for running gdb on host machines with m68k cpu's.
+   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.  */
+
+#define HOST_BYTE_ORDER BIG_ENDIAN
+
diff --git a/gdb/xm-svr4.h b/gdb/xm-svr4.h
new file mode 100755
index 0000000..f4c4a53
--- /dev/null
+++ b/gdb/xm-svr4.h
@@ -0,0 +1,56 @@
+/* Definitions for running gdb on a host machine running any flavor of SVR4.
+   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.  */
+
+/* SVR4 has /proc support, so use it instead of ptrace. */
+
+#define USE_PROC_FS
+
+/* SVR4 has termio facilities. */
+
+#define HAVE_TERMIO
+
+/* TIOCGETC and TIOCGLTC are picked up somewhere, but struct tchars
+   and struct ltchars are not.  This makes problems for inflow.c.
+   It is unknown at this time if this is a generic SVR4 problem or
+   one just limited to the initial SVR4 port host machine. */
+
+#define TIOCGETC_BROKEN
+#define TIOCGLTC_BROKEN
+
+/* SVR4 is a derivative of System V Release 3 (USG) */
+
+#define USG
+
+/* Get rid of any system-imposed stack limit if possible.  */
+
+/* #define SET_STACK_LIMIT_HUGE */
+
+/* SVR4 machines can easily do attach and detach via /proc (procfs.c)
+   support */
+
+#define ATTACH_DETACH
+
+/* If we are using SVR4 /proc instead of ptrace, use CREATE_INFERIOR_HOOK
+   to do internal /proc initialization. */
+
+#ifdef USE_PROC_FS
+#define CREATE_INFERIOR_HOOK(pid) inferior_proc_init(pid)
+#endif
+