Initial revision

8 files changed, 1806 insertions, 0 deletions

diff --git a/gdb/MAINTAINERS b/gdb/MAINTAINERS
new file mode 100644
index 00000000000..3810c96c1b8
--- /dev/null
+++ b/gdb/MAINTAINERS
@@ -0,0 +1,33 @@
+d10v target		Andrew Cagney		cagney@cygnus.com
+d30v target		Andrew Cagney		cagney@cygnus.com
+mips target		Andrew Cagney		cagney@cygnus.com
+powerpc target		Andrew Cagney		cagney@cygnus.com
+generic arch support	Andrew Cagney		cagney@cygnus.com
+target vector		Andrew Cagney		cagney@cygnus.com
+remote.c		Andrew Cagney		cagney@cygnus.com
+djgpp native		DJ Delorie		dj@cygnus.com
+win32 host & native	Chris Faylor		cgf@cygnus.com
+main (main.c, top.c)	Elena Zannoni		ezannoni@cygnus.com
+readline		Elena Zannoni		ezannoni@cygnus.com
+arm target		Elena Zannoni		ezannoni@cygnus.com
+command interpreter	Fernando Nasser		fnasser@cygnus.com
+generic symtabs		Jim Blandy		jimb@cygnus.com
+dwarf readers		Jim Blandy		jimb@cygnus.com
+elf reader		Jim Blandy		jimb@cygnus.com
+stabs reader		Jim Blandy		jimb@cygnus.com
+x86 linux native	Jim Blandy		jimb@cygnus.com
+Scheme support		Jim Blandy		jimb@cygnus.com
+m32r target		Michael Snyder		msnyder@cygnus.com
+tracing			Michael Snyder		msnyder@cygnus.com
+threads			Michael Snyder		msnyder@cygnus.com
+breakpoint.c		Michael Snyder		msnyder@cygnus.com
+macos host & native	Stan Shebs		shebs@cygnus.com
+sds protocol		Stan Shebs		shebs@cygnus.com
+rdi/adp protocol	Stan Shebs		shebs@cygnus.com
+gdbserver		Stan Shebs		shebs@cygnus.com
+documentation	 	Stan Shebs		shebs@cygnus.com
+testsuite	 	Stan Shebs		shebs@cygnus.com
+language support	David Taylor		taylor@cygnus.com
+expression eval		David Taylor		taylor@cygnus.com
+defs.h			David Taylor		taylor@cygnus.com
+utils.c			David Taylor		taylor@cygnus.com
diff --git a/gdb/config/i386/go32.mt b/gdb/config/i386/go32.mt
new file mode 100644
index 00000000000..9b82c6426b4
--- /dev/null
+++ b/gdb/config/i386/go32.mt
@@ -0,0 +1,3 @@
+# Target: Intel 386 running DJGPP
+TDEPFILES= i386-tdep.o i387-tdep.o
+TM_FILE= tm-go32.h
diff --git a/gdb/config/i386/nm-go32.h b/gdb/config/i386/nm-go32.h
new file mode 100644
index 00000000000..183b60fa181
--- /dev/null
+++ b/gdb/config/i386/nm-go32.h
@@ -0,0 +1,57 @@
+/* Native definitions for Intel x86 running DJGPP.
+   Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#define NO_PTRACE_H
+
+#include "i386/nm-i386v.h"
+
+#define TARGET_HAS_HARDWARE_WATCHPOINTS
+
+#define TARGET_CAN_USE_HARDWARE_WATCHPOINT(type, cnt, ot) 1
+
+/* After a watchpoint trap, the PC points to the instruction after the
+   one that caused the trap.  Therefore we don't need to step over it.
+   But we do need to reset the status register to avoid another trap.  */
+
+#define HAVE_CONTINUABLE_WATCHPOINT
+
+#define STOPPED_BY_WATCHPOINT(W)  \
+  go32_stopped_by_watchpoint (inferior_pid)
+
+/* Use these macros for watchpoint insertion/removal.  */
+
+#define target_insert_watchpoint(addr, len, type)  \
+  go32_insert_watchpoint (inferior_pid, addr, len, 2)
+
+#define target_remove_watchpoint(addr, len, type)  \
+  go32_remove_watchpoint (inferior_pid, addr, len)
+
+#define target_insert_hw_breakpoint(addr, shadow)  \
+  go32_insert_hw_breakpoint(addr, shadow)
+  
+#define target_remove_hw_breakpoint(addr, shadow)  \
+  go32_remove_hw_breakpoint(addr, shadow)
+
+#define DECR_PC_AFTER_HW_BREAK 0
+
+#undef FLOAT_INFO
+#define FLOAT_INFO { i386_go32_float_info (); }
+
+extern void i386_go32_float_info (void);
+
diff --git a/gdb/config/i386/tm-go32.h b/gdb/config/i386/tm-go32.h
new file mode 100644
index 00000000000..84b82929ec5
--- /dev/null
+++ b/gdb/config/i386/tm-go32.h
@@ -0,0 +1,212 @@
+/* Target-dependent definitions for Intel x86 running DJGPP.
+   Copyright 1995, 1996, 1997 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "i386/tm-i386v.h"
+
+/* Number of machine registers. */
+
+#undef NUM_FREGS
+#define NUM_FREGS 15
+#undef NUM_REGS
+#define NUM_REGS (16+NUM_FREGS)
+
+/* Initializer for an array of names of registers.  There should be
+   NUM_REGS strings in this initializer.  */
+
+/* The order of the first 8 registers must match the compiler's
+   numbering scheme (which is the same as the 386 scheme).  */
+
+#undef REGISTER_NAMES
+#define REGISTER_NAMES { "eax",  "ecx",   "edx",  "ebx",  \
+			 "esp",  "ebp",   "esi",  "edi",  \
+			 "eip",  "eflags","cs",   "ss",   \
+			 "ds",   "es",    "fs",   "gs",   \
+			 "st0",  "st1",   "st2",  "st3",  \
+                         "st4",  "st5",   "st6",  "st7",  \
+			 "fctrl","fstat", "ftag", "fcs",  \
+			 "fopsel","fip",  "fopoff" }
+
+#undef FP_REGNUM
+#define FP_REGNUM  5		/* (ebp) Contains addr of stack frame */
+#undef  SP_REGNUM
+#define SP_REGNUM  4		/* (usp) Contains address of top of stack */
+#undef  PS_REGNUM
+#define PS_REGNUM  9		/* (ps)  Contains processor status */
+#undef  PC_REGNUM
+#define PC_REGNUM  8		/* (eip) Contains program counter */
+#undef  FP0_REGNUM
+#define FP0_REGNUM 16		/* Floating point register 0 */
+#undef  FPC_REGNUM
+#define FPC_REGNUM 24		/* 80387 control register */
+#undef  FPCWD_REGNUM
+#define FPCWD_REGNUM FPC_REGNUM
+#undef  FPSWD_REGNUM
+#define FPSWD_REGNUM 25		/* 80387 status register */
+#undef  FPTWD_REGNUM
+#define FPTWD_REGNUM 26		/* 80387 tag register */
+#undef  FPIPO_REGNUM
+#define FPIPO_REGNUM 29		/* 80387 instruction pointer offset reg */
+#undef  FPIPS_REGNUM
+#define FPIPS_REGNUM 27		/* 80387 instruction pointer selector reg */
+#undef  FPOOS_REGNUM
+#define FPOOS_REGNUM 30		/* 80387 operand pointer offset reg */
+#undef  FPOPS_REGNUM
+#define FPOPS_REGNUM 28		/* 80387 operand pointer selector reg */
+
+/* Total amount of space needed to store our copies of the machine's
+   register state, the array `registers'.  */
+
+#undef REGISTER_BYTES
+#define REGISTER_BYTES (10*4 + 6*2 + 8*10 + 5*2 + 2*4)
+
+/* Index within `registers' of the first byte of the space for
+   register N.  */
+
+#undef REGISTER_BYTE
+#define REGBYTE_0  0
+#define REGBYTE_10 (REGBYTE_0+10*4)
+#define REGBYTE_16 (REGBYTE_10+6*2)
+#define REGBYTE_24 (REGBYTE_16+8*10)
+#define REGBYTE_29 (REGBYTE_24+5*2)
+#define REGISTER_BYTE(N) (((N) < 10) ? (N) * 4 : \
+                          (N) < 16 ? REGBYTE_10 +((N) - 10) * 2 : \
+                          (N) < 24 ? REGBYTE_16 +((N) - 16) * 10 : \
+                          (N) < 29 ? REGBYTE_24 +((N) - 24) * 2 : \
+                          REGBYTE_29 + ((N) - 29) * 4)
+
+/* Number of bytes of storage in the actual machine representation
+   for register N.  */
+
+#undef REGISTER_RAW_SIZE
+#define REGISTER_RAW_SIZE(N) ((N) < 10 ? 4 : (N) < 16 ? 2 : (N) < 24 ? 10 : \
+                              (N) < 29 ? 2 : 4)
+
+/* Number of bytes of storage in the program's representation
+   for register N. */
+
+#undef REGISTER_VIRTUAL_SIZE
+#define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
+
+/* Largest value REGISTER_RAW_SIZE can have.  */
+
+#undef MAX_REGISTER_RAW_SIZE
+#define MAX_REGISTER_RAW_SIZE 10
+
+/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
+
+#undef MAX_REGISTER_VIRTUAL_SIZE
+#define MAX_REGISTER_VIRTUAL_SIZE 10
+
+/* Nonzero if register N requires conversion
+   from raw format to virtual format.  */
+
+#undef REGISTER_CONVERTIBLE
+#define REGISTER_CONVERTIBLE(N) ((N) < FP0_REGNUM ? 0 :\
+                                 (N) < FPC_REGNUM ? 1 : 0)
+
+/* The host and target are i386 machines and the compiler supports
+   long doubles. Long doubles on the host therefore have the same
+   layout as a 387 FPU stack register. */
+
+#if defined(HAVE_LONG_DOUBLE) && defined(HOST_I386)
+#undef LD_I387
+#define LD_I387
+#endif
+
+/* Allow floating point numbers to be specified by a raw long double
+   10 hex bytes number, e.g. 1.0 can be input as
+   0x3fff8000000000000000 */
+
+#ifdef LD_I387
+#define HEX_LONG_DOUBLE_INPUT(base,p,len,target) \
+  ((base) == 16 && (len) == 20 \
+   && i387_hex_long_double_input ((p), (target)))
+#endif
+
+extern int i387_hex_long_double_input (char *p, long double *putithere);
+
+#undef REGISTER_CONVERT_TO_VIRTUAL
+#ifdef LD_I387
+#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
+{ \
+  if (TYPE == REGISTER_VIRTUAL_TYPE (REGNUM)) \
+    { \
+      memcpy (TO, FROM, TYPE_LENGTH (TYPE)); \
+    } \
+  else \
+    { \
+      long double val = *((long double *)FROM); \
+      store_floating ((TO), TYPE_LENGTH (TYPE), val); \
+    } \
+}
+#else
+/* Convert data from raw format for register REGNUM in buffer FROM to
+   virtual format with type TYPE in buffer TO.  */
+#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
+{ \
+  double val; \
+  i387_to_double ((FROM), (char *)&val); \
+  store_floating ((TO), TYPE_LENGTH (TYPE), val); \
+}
+#endif
+
+extern void i387_to_double PARAMS ((char *, char *));
+
+#undef REGISTER_CONVERT_TO_RAW
+#ifdef LD_I387
+#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \
+{ \
+  if (TYPE == REGISTER_VIRTUAL_TYPE (REGNUM)) \
+    { \
+      memcpy (TO, FROM, TYPE_LENGTH (TYPE)); \
+    } \
+  else \
+    { \
+      long double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
+      *((long double *)TO) = val; \
+    } \
+}
+#else
+#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \
+{ \
+  double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
+  double_to_i387((char *)&val, (TO)); \
+}
+#endif
+
+extern void double_to_i387 PARAMS ((char *, char *));
+
+/* Return the GDB type object for the "standard" data type of data in
+   register N.  */
+
+#undef REGISTER_VIRTUAL_TYPE
+#ifdef LD_I387
+#define REGISTER_VIRTUAL_TYPE(N) \
+  ((N < FP0_REGNUM) ? builtin_type_int : \
+   (N < FPC_REGNUM) ? builtin_type_long_double : builtin_type_int)
+#else
+#define REGISTER_VIRTUAL_TYPE(N) \
+  ((N < FP0_REGNUM) ? builtin_type_int : \
+   (N < FPC_REGNUM) ? builtin_type_double : builtin_type_int)
+#endif
+
+#undef TARGET_LONG_DOUBLE_BIT
+#define TARGET_LONG_DOUBLE_BIT 96
+
+#define NAMES_HAVE_UNDERSCORE
diff --git a/gdb/config/tic80/tic80.mt b/gdb/config/tic80/tic80.mt
new file mode 100644
index 00000000000..10be27e2633
--- /dev/null
+++ b/gdb/config/tic80/tic80.mt
@@ -0,0 +1,7 @@
+# Target: TI TMS320C80 (MVP) processor
+TDEPFILES= tic80-tdep.o
+TM_FILE= tm-tic80.h
+SIM_OBS = remote-sim.o
+SIM = ../sim/tic80/libsim.a
+GDBSERVER_DEPFILES= low-sim.o
+GDBSERVER_LIBS = ../../sim/tic80/libsim.a ../../bfd/libbfd.a ../../libiberty/libiberty.a -lm
diff --git a/gdb/config/tic80/tm-tic80.h b/gdb/config/tic80/tm-tic80.h
new file mode 100644
index 00000000000..e17ca95b838
--- /dev/null
+++ b/gdb/config/tic80/tm-tic80.h
@@ -0,0 +1,257 @@
+/* Parameters for execution on a TI TMS320C80 (MVP) processor.
+   Copyright 1997
+   Free Software Foundation, Inc. 
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifndef TM_TIC80_H
+#define TM_TIC80_H
+
+#ifdef __STDC__		/* Forward declare structs used in prototypes */
+struct frame_info;
+struct type;
+struct value;
+struct symbol;
+struct frame_saved_regs;
+#endif
+
+#define TARGET_BYTE_ORDER LITTLE_ENDIAN
+
+/* Define this if the C compiler puts an underscore at the front
+   of external names before giving them to the linker.  */
+
+#define NAMES_HAVE_UNDERSCORE
+
+#define NUM_REGS 38
+
+#define REGISTER_NAMES \
+{ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
+  "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
+  "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
+  "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
+  "pc", "npc", \
+  "a0", "a1", "a2", "a3", \
+}
+
+/* Various dedicated register numbers
+   FIXME: Shadow updates in sim/tic80/sim-calls.c */
+
+#define SP_REGNUM 1		/* Contains address of top of stack */
+#define ARG0_REGNUM 2		/* Contains argument 1 (r3 has high word) */
+#define RET_REGNUM  2		/* Contains function return value */
+#define ARGLAST_REGNUM 12	/* Contains argument 6 (r13 has high word) */
+#define FP_REGNUM 30		/* Contains address of executing stack frame */
+#define LR_REGNUM 31		/* Contains address of caller (link register) */
+#define PC_REGNUM 32		/* Contains program counter (FIXME?) */
+#define NPC_REGNUM 33		/* Contains the next program counter (FIXME?) */
+#define A0_REGNUM 34		/* Accumulator register 0 */
+#define A3_REGNUM 37		/* Accumulator register 1 */
+
+#define R0_REGNUM 0             /* General Purpose Register 0 - for sim */
+#define Rn_REGNUM 31            /* Last General Purpose Register - for sim */
+#define An_REGNUM A3_REGNUM     /* Last Accumulator register - for sim */
+
+/* Total amount of space needed to store our copies of the machine's
+   register state, the array `registers'.  */
+
+#define REGISTER_BYTES (((NUM_REGS - 4) * 4) + (4 * 8))
+
+/* Index within `registers' of the first byte of the space for
+   register N.  */
+
+#define REGISTER_BYTE(N) \
+   (((N) >= A0_REGNUM) ? (((N) - A0_REGNUM) * 8 + A0_REGNUM * 4) : ((N) * 4))
+
+/* Most registers are 4 bytes */
+
+#define REGISTER_SIZE 4
+
+/* Some registers are 8 bytes.  */
+
+#define REGISTER_RAW_SIZE(N) \
+     (((N) >= A0_REGNUM) ? 8 : 4)
+
+/* Largest value REGISTER_RAW_SIZE can have.  */
+
+#define MAX_REGISTER_RAW_SIZE (8)
+
+/* All regs are 4 bytes.  */
+
+#define REGISTER_VIRTUAL_SIZE(N) (REGISTER_RAW_SIZE(N))
+
+/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
+
+#define MAX_REGISTER_VIRTUAL_SIZE (MAX_REGISTER_RAW_SIZE)
+
+/* Return the GDB type object for the "standard" data type
+   of data in register N.  */
+
+#define REGISTER_VIRTUAL_TYPE(N) /* FIXME? */ \
+	(((N) >= A0_REGNUM) ? builtin_type_float : builtin_type_int)
+
+/* Offset from address of function to start of its code.
+   Zero on most machines.  */
+
+#define FUNCTION_START_OFFSET 0
+
+/* Stack grows downward.  */
+
+#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
+
+/* Sequence of bytes for breakpoint instruction.
+   This is padded out to the size of a machine word. */
+
+#define BREAKPOINT 		{0x49, 0x80, 0x00, 0x00}	/* FIXME! */
+
+/* Amount PC must be decremented by after a breakpoint.
+   This is often the number of bytes in BREAKPOINT
+   but not always.  */
+
+#define DECR_PC_AFTER_BREAK	0			/* FIXME! */
+
+/* Discard from the stack the innermost frame, restoring all registers.  */
+
+#define POP_FRAME tic80_pop_frame(get_current_frame ())
+extern struct frame_info *tic80_pop_frame PARAMS ((struct frame_info *frame));
+
+/* Return number of bytes at start of arglist that are not really args.  */
+
+#define FRAME_ARGS_SKIP 0
+
+/* Set VAL to the number of args passed to frame described by FI.
+   Can set VAL to -1, meaning no way to tell.  */
+/* We can't tell how many args there are */
+
+#define FRAME_NUM_ARGS(val,fi) (val = -1)
+
+#define FRAME_ARGS_SKIP 0
+#define FRAME_ARGS_ADDRESS(fi)   (fi)->frame
+#define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
+
+/* Define other aspects of the stack frame. 
+   We keep the offsets of all saved registers, 'cause we need 'em a lot!
+   We also keep the current size of the stack frame, and the offset of
+   the frame pointer from the stack pointer (for frameless functions, and
+   when we're still in the prologue of a function with a frame) */
+
+#define EXTRA_FRAME_INFO  	\
+  struct frame_saved_regs fsr;	\
+  int framesize;		\
+  int frameoffset;		\
+  int framereg;
+
+extern void tic80_init_extra_frame_info PARAMS ((struct frame_info *fi));
+#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) tic80_init_extra_frame_info (fi)
+#define INIT_FRAME_PC		/* Not necessary */
+
+/* Put here the code to store, into a struct frame_saved_regs,
+   the addresses of the saved registers of frame described by FRAME_INFO.
+   This includes special registers such as pc and fp saved in special
+   ways in the stack frame.  sp is even more special:
+   the address we return for it IS the sp for the next frame.  */
+
+#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)	    \
+   tic80_frame_find_saved_regs(frame_info, &(frame_saved_regs))
+extern void tic80_frame_find_saved_regs PARAMS ((struct frame_info *, struct frame_saved_regs *));
+
+/* Advance PC across any function entry prologue instructions
+   to reach some "real" code.  */
+
+#define SKIP_PROLOGUE(pc)	{ (pc) = tic80_skip_prologue (pc); }
+extern CORE_ADDR tic80_skip_prologue PARAMS ((CORE_ADDR pc));
+
+/* Immediately after a function call, return the saved pc.
+   Can't always go through the frames for this because on some machines
+   the new frame is not set up until the new function executes
+   some instructions.  */
+
+#define SAVED_PC_AFTER_CALL(frame) read_register (LR_REGNUM)
+
+/* Describe the pointer in each stack frame to the previous stack frame
+   (its caller).  */
+
+/* FRAME_CHAIN takes a frame's nominal address
+   and produces the frame's chain-pointer. */
+
+#define FRAME_CHAIN(thisframe) (CORE_ADDR) tic80_frame_chain (thisframe)
+extern CORE_ADDR tic80_frame_chain PARAMS ((struct frame_info *));
+
+#define FRAME_SAVED_PC(FRAME)	tic80_frame_saved_pc (FRAME)
+extern CORE_ADDR tic80_frame_saved_pc PARAMS ((struct frame_info *));
+
+/* Store the address of the place in which to copy the structure the
+   subroutine will return.  This is called from call_function. 
+
+   We store structs through a pointer passed in R2 */
+
+#define STORE_STRUCT_RETURN(STRUCT_ADDR, SP)	\
+	write_register (ARG0_REGNUM, STRUCT_ADDR)
+
+/* Extract from an array REGBUF containing the (raw) register state
+   a function return value of type TYPE, and copy that, in virtual format,
+   into VALBUF.  */
+
+#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
+  memcpy ((VALBUF), \
+	  (char *)(REGBUF) + REGISTER_BYTE (RET_REGNUM) + \
+	  ((TYPE_LENGTH (TYPE) > 4 ? 8 : 4) - TYPE_LENGTH (TYPE)), \
+	  TYPE_LENGTH (TYPE))
+
+/* Write into appropriate registers a function return value
+   of type TYPE, given in virtual format.  */
+
+#define STORE_RETURN_VALUE(TYPE,VALBUF) \
+  write_register_bytes(REGISTER_BYTE (RET_REGNUM) + \
+		       ((TYPE_LENGTH (TYPE) > 4 ? 8:4) - TYPE_LENGTH (TYPE)),\
+		       (VALBUF), TYPE_LENGTH (TYPE));
+
+
+
+/* PUSH_ARGUMENTS */
+extern CORE_ADDR tic80_push_arguments PARAMS ((int nargs, 
+					       struct value **args, 
+					       CORE_ADDR sp,
+					       unsigned char struct_return,
+					       CORE_ADDR struct_addr));
+
+#define PUSH_ARGUMENTS(NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR) \
+  (SP) = tic80_push_arguments (NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR)
+
+/* PUSH_RETURN_ADDRESS */
+extern CORE_ADDR tic80_push_return_address PARAMS ((CORE_ADDR, CORE_ADDR));
+#define PUSH_RETURN_ADDRESS(PC, SP)	tic80_push_return_address (PC, SP)
+
+/* override the standard get_saved_register function with 
+   one that takes account of generic CALL_DUMMY frames */
+#define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \
+      generic_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
+
+#define USE_GENERIC_DUMMY_FRAMES 1
+#define CALL_DUMMY                   {0}
+#define CALL_DUMMY_LENGTH            (0)
+#define CALL_DUMMY_START_OFFSET      (0)
+#define CALL_DUMMY_BREAKPOINT_OFFSET (0)
+#define FIX_CALL_DUMMY(DUMMY1, STARTADDR, FUNADDR, NARGS, ARGS, TYPE, GCCP)
+#define CALL_DUMMY_LOCATION          AT_ENTRY_POINT
+#define CALL_DUMMY_ADDRESS()         entry_point_address ()
+
+/* generic dummy frame stuff */
+
+#define PUSH_DUMMY_FRAME             generic_push_dummy_frame ()
+#define PC_IN_CALL_DUMMY(PC, SP, FP) generic_pc_in_call_dummy (PC, SP, FP)
+
+#endif	/* TM_TIC80_H */
diff --git a/gdb/go32-nat.c b/gdb/go32-nat.c
new file mode 100644
index 00000000000..782d240805b
--- /dev/null
+++ b/gdb/go32-nat.c
@@ -0,0 +1,754 @@
+/* Native debugging support for Intel x86 running DJGPP.
+   Copyright 1997, 1999 Free Software Foundation, Inc.
+   Written by Robert Hoehne.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include <fcntl.h>
+
+#include "defs.h"
+#include "frame.h"		/* required by inferior.h */
+#include "inferior.h"
+#include "target.h"
+#include "wait.h"
+#include "gdbcore.h"
+#include "command.h"
+#include "floatformat.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <debug/v2load.h>
+#include <debug/dbgcom.h>
+
+extern void _initialize_go32_nat (void);
+
+struct env387
+{
+  unsigned short control;
+  unsigned short r0;
+  unsigned short status;
+  unsigned short r1;
+  unsigned short tag;
+  unsigned short r2;
+  unsigned long eip;
+  unsigned short code_seg;
+  unsigned short opcode;
+  unsigned long operand;
+  unsigned short operand_seg;
+  unsigned short r3;
+  unsigned char regs[8][10];
+};
+
+extern char **environ;
+
+#define SOME_PID 42
+
+/* FIXME add decls of all static functions here */
+
+static int prog_has_started = 0;
+
+static void
+print_387_status (unsigned short status, struct env387 *ep)
+{
+  int i;
+  int bothstatus;
+  int top;
+  int fpreg;
+
+  bothstatus = ((status != 0) && (ep->status != 0));
+  if (status != 0)
+    {
+      if (bothstatus)
+	printf_unfiltered ("u: ");
+      print_387_status_word (status);
+    }
+
+  if (ep->status != 0)
+    {
+      if (bothstatus)
+	printf_unfiltered ("e: ");
+      print_387_status_word (ep->status);
+    }
+
+  print_387_control_word (ep->control & 0xffff);
+  printf_unfiltered ("last exception: ");
+  printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));
+  printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
+  printf_unfiltered ("%s; ", local_hex_string (ep->eip));
+  printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
+  printf_unfiltered (":%s\n", local_hex_string (ep->operand));
+
+  top = (ep->status >> 11) & 7;
+
+  printf_unfiltered ("regno tag   msb          lsb  value\n");
+  for (fpreg = 0; fpreg < 8; fpreg++)
+    {
+      long double val;
+
+      printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
+
+      switch ((ep->tag >> (fpreg * 2)) & 3)
+	{
+	case 0:
+	  printf_unfiltered ("valid ");
+	  break;
+	case 1:
+	  printf_unfiltered ("zero  ");
+	  break;
+	case 2:
+	  printf_unfiltered ("trap  ");
+	  break;
+	case 3:
+	  printf_unfiltered ("empty ");
+	  break;
+	}
+      for (i = 0; i < 8; i++)
+	printf_unfiltered ("%02x", ep->regs[fpreg][i]);
+
+      REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM + fpreg, builtin_type_long_double,
+				   &ep->regs[fpreg], &val);
+
+      printf_unfiltered ("  %LG\n", val);
+    }
+}
+
+void
+i386_go32_float_info (void)
+{
+  print_387_status (0, (struct env387 *) &npx);
+}
+
+#define r_ofs(x) ((int)(&(((TSS *)0)->x)))
+
+static struct
+{
+  int tss_ofs;
+  int size;
+}
+regno_mapping[] =
+{
+  r_ofs (tss_eax), 4,
+  r_ofs (tss_ecx), 4,
+  r_ofs (tss_edx), 4,
+  r_ofs (tss_ebx), 4,
+  r_ofs (tss_esp), 4,
+  r_ofs (tss_ebp), 4,
+  r_ofs (tss_esi), 4,
+  r_ofs (tss_edi), 4,
+  r_ofs (tss_eip), 4,
+  r_ofs (tss_eflags), 4,
+  r_ofs (tss_cs), 2,
+  r_ofs (tss_ss), 2,
+  r_ofs (tss_ds), 2,
+  r_ofs (tss_es), 2,
+  r_ofs (tss_fs), 2,
+  r_ofs (tss_gs), 2,
+  0, 10,
+  1, 10,
+  2, 10,
+  3, 10,
+  4, 10,
+  5, 10,
+  6, 10,
+  7, 10,
+  0, 2,
+  4, 2,
+  8, 2,
+  12, 4,
+  16, 2,
+  20, 4,
+  24, 2
+};
+
+static struct
+  {
+    int go32_sig;
+    int gdb_sig;
+  }
+sig_map[] =
+{
+  0, TARGET_SIGNAL_FPE,
+  1, TARGET_SIGNAL_TRAP,
+  2, TARGET_SIGNAL_UNKNOWN,
+  3, TARGET_SIGNAL_TRAP,
+  4, TARGET_SIGNAL_FPE,
+  5, TARGET_SIGNAL_SEGV,
+  6, TARGET_SIGNAL_ILL,
+  7, TARGET_SIGNAL_FPE,
+  8, TARGET_SIGNAL_SEGV,
+  9, TARGET_SIGNAL_SEGV,
+  10, TARGET_SIGNAL_BUS,
+  11, TARGET_SIGNAL_SEGV,
+  12, TARGET_SIGNAL_SEGV,
+  13, TARGET_SIGNAL_ABRT,
+  14, TARGET_SIGNAL_SEGV,
+  16, TARGET_SIGNAL_FPE,
+  31, TARGET_SIGNAL_ILL,
+  0x75, TARGET_SIGNAL_FPE,
+  0x79, TARGET_SIGNAL_INT,
+  0x1b, TARGET_SIGNAL_INT,
+  -1, -1
+};
+
+static void
+go32_open (char *name, int from_tty)
+{
+  printf_unfiltered ("Use the `run' command to run go32 programs\n");
+}
+
+static void
+go32_close (int quitting)
+{
+}
+
+static void
+go32_attach (char *args, int from_tty)
+{
+  printf_unfiltered ("Use the `run' command to run go32 programs\n");
+}
+
+static void
+go32_detach (char *args, int from_tty)
+{
+}
+
+static int resume_is_step;
+
+static void
+go32_resume (int pid, int step, enum target_signal siggnal)
+  {
+    resume_is_step = step;
+  }
+
+static int
+go32_wait (int pid, struct target_waitstatus *status)
+{
+  int i;
+
+  if (resume_is_step)
+    a_tss.tss_eflags |= 0x0100;
+  else
+    a_tss.tss_eflags &= 0xfeff;
+
+  run_child ();
+
+  if (a_tss.tss_irqn == 0x21)
+    {
+      status->kind = TARGET_WAITKIND_EXITED;
+      status->value.integer = a_tss.tss_eax & 0xff;
+    }
+  else
+    {
+      status->value.sig = TARGET_SIGNAL_UNKNOWN;
+      status->kind = TARGET_WAITKIND_STOPPED;
+      for (i = 0; sig_map[i].go32_sig != -1; i++)
+	{
+	  if (a_tss.tss_irqn == sig_map[i].go32_sig)
+	    {
+	      if ((status->value.sig = sig_map[i].gdb_sig) !=
+		  TARGET_SIGNAL_TRAP)
+		status->kind = TARGET_WAITKIND_SIGNALLED;
+	      break;
+	    }
+	}
+    }
+  return SOME_PID;
+}
+
+static void
+go32_fetch_registers (int regno)
+{
+  /*JHW*/
+  int end_reg = regno + 1;	/* just one reg initially */
+
+  if (regno < 0)		/* do the all registers */
+    {
+      regno = 0;		/* start at first register */
+      /* # regs in table */
+      end_reg = sizeof (regno_mapping) / sizeof (regno_mapping[0]);
+    }
+
+  for (; regno < end_reg; regno++)
+    {
+      if (regno < 16)
+	supply_register (regno,
+			 (char *) &a_tss + regno_mapping[regno].tss_ofs);
+      else if (regno < 24)
+	supply_register (regno,
+			 (char *) &npx.reg[regno_mapping[regno].tss_ofs]);
+      else if (regno < 31)
+	supply_register (regno,
+			 (char *) &npx.reg + regno_mapping[regno].tss_ofs);
+      else
+	{
+	  printf_unfiltered ("Invalid register in go32_fetch_register(%d)",
+			     regno);
+	  exit (1);
+	}
+    }
+}
+
+static void
+store_register (int regno)
+{
+  void *rp;
+  void *v = (void *) &registers[REGISTER_BYTE (regno)];
+
+  if (regno < 16)
+    rp = (char *) &a_tss + regno_mapping[regno].tss_ofs;
+  else if (regno < 24)
+    rp = (char *) &npx.reg[regno_mapping[regno].tss_ofs];
+  else if (regno > 31)
+    rp = (char *) &npx + regno_mapping[regno].tss_ofs;
+  else
+    {
+      printf_unfiltered ("Invalid register in store_register(%d)", regno);
+      exit (1);
+    }
+  memcpy (rp, v, regno_mapping[regno].size);
+}
+
+static void
+go32_store_registers (int regno)
+{
+  int r;
+
+  if (regno >= 0)
+    store_register (regno);
+  else
+    {
+      for (r = 0; r < sizeof (regno_mapping) / sizeof (regno_mapping[0]); r++)
+	store_register (r);
+    }
+}
+
+static void
+go32_prepare_to_store (void)
+{
+}
+
+static int
+go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
+		  struct target_ops *target)
+{
+  if (write)
+    {
+      if (write_child (memaddr, myaddr, len))
+	{
+	  return 0;
+	}
+      else
+	{
+	  return len;
+	}
+    }
+  else
+    {
+      if (read_child (memaddr, myaddr, len))
+	{
+	  return 0;
+	}
+      else
+	{
+	  return len;
+	}
+    }
+}
+
+static void
+go32_files_info (struct target_ops *target)
+{
+  printf_unfiltered ("You are running a DJGPP V2 program\n");
+}
+
+static void
+go32_stop (void)
+{
+  normal_stop ();
+  cleanup_client ();
+  inferior_pid = 0;
+  prog_has_started = 0;
+}
+
+static void
+go32_kill_inferior (void)
+{
+  go32_stop ();
+  unpush_target (&go32_ops);
+}
+
+static void
+go32_create_inferior (char *exec_file, char *args, char **env)
+{
+  jmp_buf start_state;
+  char *cmdline;
+  char **env_save = environ;
+
+  if (prog_has_started)
+    {
+      go32_kill_inferior ();
+    }
+
+  cmdline = (char *) alloca (strlen (args) + 4);
+  cmdline[0] = strlen (args);
+  strcpy (cmdline + 1, args);
+  cmdline[strlen (args) + 1] = 13;
+
+  environ = env;
+
+  if (v2loadimage (exec_file, cmdline, start_state))
+    {
+      environ = env_save;
+      printf_unfiltered ("Load failed for image %s\n", exec_file);
+      exit (1);
+    }
+  environ = env_save;
+
+  edi_init (start_state);
+
+  inferior_pid = SOME_PID;
+  push_target (&go32_ops);
+  clear_proceed_status ();
+  insert_breakpoints ();
+  proceed ((CORE_ADDR) - 1, TARGET_SIGNAL_0, 0);
+}
+
+static void
+go32_mourn_inferior (void)
+{
+  go32_kill_inferior ();
+  generic_mourn_inferior ();
+}
+
+static int
+go32_can_run (void)
+{
+  return 1;
+}
+
+static void
+ignore (void)
+{
+}
+
+static void
+ignore2 (char *a, int b)
+{
+}
+
+/* Hardware watchpoint support.  */
+
+#define DR_STATUS 6
+#define DR_CONTROL 7
+#define DR_ENABLE_SIZE 2
+#define DR_LOCAL_ENABLE_SHIFT 0
+#define DR_GLOBAL_ENABLE_SHIFT 1
+#define DR_LOCAL_SLOWDOWN 0x100
+#define DR_GLOBAL_SLOWDOWN 0x200
+#define DR_CONTROL_SHIFT 16
+#define DR_CONTROL_SIZE 4
+#define DR_RW_READ 0x3
+#define DR_RW_WRITE 0x1
+#define DR_CONTROL_MASK 0xf
+#define DR_ENABLE_MASK 0x3
+#define DR_LEN_1 0x0
+#define DR_LEN_2 0x4
+#define DR_LEN_4 0xc
+
+#define D_REGS edi.dr
+#define CONTROL D_REGS[DR_CONTROL]
+#define STATUS D_REGS[DR_STATUS]
+
+#define IS_REG_FREE(index) \
+  (!(CONTROL & (3 << (DR_ENABLE_SIZE * index))))
+
+#define LOCAL_ENABLE_REG(index) \
+  (CONTROL |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * index)))
+
+#define GLOBAL_ENABLE_REG(index) \
+  (CONTROL |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * index)))
+
+#define DISABLE_REG(index) \
+  (CONTROL &= ~(3 << (DR_ENABLE_SIZE * index)))
+
+#define SET_LOCAL_EXACT() \
+  (CONTROL |= DR_LOCAL_SLOWDOWN)
+
+#define SET_GLOBAL_EXACT() \
+  (CONTROL |= DR_GLOBAL_SLOWDOWN)
+
+#define SET_BREAK(index,address) \
+  do {\
+    CONTROL &= ~(DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * index));\
+    D_REGS[index] = address;\
+  } while(0)
+
+#define SET_WATCH(index,address,rw,len) \
+  do {\
+    SET_BREAK(index,address);\
+    CONTROL |= (len | rw) << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * index);\
+  } while (0)
+
+#define WATCH_HIT(index) \
+  (\
+   (STATUS & (1 << index)) && \
+   (CONTROL & (DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * index)))\
+  )
+
+#if 0 /* use debugging macro */
+#define SHOW_DR(text) \
+do { \
+  fprintf(stderr,"%08x %08x ",edi.dr[7],edi.dr[6]); \
+  fprintf(stderr,"%08x %08x ",edi.dr[0],edi.dr[1]); \
+  fprintf(stderr,"%08x %08x ",edi.dr[2],edi.dr[3]); \
+  fprintf(stderr,"(%s)\n",#text); \
+} while (0)
+#else
+#define SHOW_DR(text) do {} while (0)
+#endif
+
+static int go32_insert_aligned_watchpoint (int pid, CORE_ADDR waddr,
+					   CORE_ADDR addr, int len, int rw);
+
+static int go32_insert_nonaligned_watchpoint (int pid, CORE_ADDR waddr,
+					      CORE_ADDR addr, int len, int rw);
+
+/* Insert a watchpoint.  */
+
+int
+go32_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw)
+{
+  int ret = go32_insert_aligned_watchpoint (pid, addr, addr, len, rw);
+
+  SHOW_DR (insert_watch);
+  return ret;
+}
+
+static int
+go32_insert_aligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr,
+				int len, int rw)
+{
+  int i;
+  int read_write_bits, len_bits;
+
+  /* Look for a free debug register.  */
+  for (i = 0; i <= 3; i++)
+    {
+      if (IS_REG_FREE (i))
+	break;
+    }
+
+  /* No more debug registers!  */
+  if (i > 3)
+    return -1;
+
+  read_write_bits = ((rw & 1) ? DR_RW_READ : 0) | ((rw & 2) ? DR_RW_WRITE : 0);
+
+  if (len == 1)
+    len_bits = DR_LEN_1;
+  else if (len == 2)
+    {
+      if (addr % 2)
+	return go32_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
+      len_bits = DR_LEN_2;
+    }
+  else if (len == 4)
+    {
+      if (addr % 4)
+	return go32_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
+      len_bits = DR_LEN_4;
+    }
+  else
+    return go32_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
+
+  SET_WATCH (i, addr, read_write_bits, len_bits);
+  LOCAL_ENABLE_REG (i);
+  SET_LOCAL_EXACT ();
+}
+
+static int
+go32_insert_nonaligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr,
+				   int len, int rw)
+{
+  int align;
+  int size;
+  int rv = 0;
+
+  static int size_try_array[16] =
+  {
+    1, 1, 1, 1,			/* trying size one */
+    2, 1, 2, 1,			/* trying size two */
+    2, 1, 2, 1,			/* trying size three */
+    4, 1, 2, 1			/* trying size four */
+  };
+
+  while (len > 0)
+    {
+      align = addr % 4;
+      /* Four is the maximum length for 386.  */
+      size = (len > 4) ? 3 : len - 1;
+      size = size_try_array[size * 4 + align];
+      rv = go32_insert_aligned_watchpoint (pid, waddr, addr, size, rw);
+      if (rv)
+	{
+	  go32_remove_watchpoint (pid, waddr, size);
+	  return rv;
+	}
+      addr += size;
+      len -= size;
+    }
+  return rv;
+}
+
+/* Remove a watchpoint.  */
+
+int
+go32_remove_watchpoint (int pid, CORE_ADDR addr, int len)
+{
+  int i;
+
+  for (i = 0; i <= 3; i++)
+    {
+      if (D_REGS[i] == addr)
+	{
+	  DISABLE_REG (i);
+	}
+    }
+  SHOW_DR (remove_watch);
+
+  return 0;
+}
+
+/* Check if stopped by a watchpoint.  */
+
+CORE_ADDR
+go32_stopped_by_watchpoint (int pid)
+{
+  int i, ret = 0;
+  int status;
+
+  status = edi.dr[DR_STATUS];
+  SHOW_DR (stopped_by);
+  for (i = 0; i <= 3; i++)
+    {
+      if (WATCH_HIT (i))
+	{
+	  SHOW_DR (HIT);
+	  ret = D_REGS[i];
+	}
+    }
+  /* this is a hack to GDB. If we stopped at a hardware breakpoint,
+     the stop_pc must incremented by DECR_PC_AFTER_BREAK. I tried everything
+     with the DECR_PC_AFTER_HW_BREAK, but nothing works. */
+  /* This is probably fixed by jtc's recent patch -sts 2/19/99 */
+  if (STATUS && !ret)
+    stop_pc += DECR_PC_AFTER_BREAK;
+  STATUS = 0;
+
+  return ret;
+}
+
+/* Remove a breakpoint.  */
+
+int
+go32_remove_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow)
+{
+  int i;
+  for (i = 0; i <= 3; i++)
+    {
+      if (D_REGS[i] == addr)
+	{
+	  DISABLE_REG (i);
+	}
+    }
+  SHOW_DR (remove_hw);
+  return 0;
+}
+
+int
+go32_insert_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow)
+{
+  int i;
+  int read_write_bits, len_bits;
+  int free_debug_register;
+  int register_number;
+
+  /* Look for a free debug register.  */
+  for (i = 0; i <= 3; i++)
+    {
+      if (IS_REG_FREE (i))
+	break;
+    }
+
+  /* No more debug registers!  */
+  if (i > 3)
+    return -1;
+
+  SET_BREAK (i, addr);
+  LOCAL_ENABLE_REG (i);
+  SHOW_DR (insert_hw);
+
+  return 0;
+}
+
+static struct target_ops go32_ops;
+
+static void
+init_go32_ops (void)
+{
+  go32_ops.to_shortname = "djgpp";
+  go32_ops.to_longname = "djgpp target process";
+  go32_ops.to_doc =
+    "Program loaded by djgpp, when gdb is used as an external debugger";
+  go32_ops.to_open = go32_open;
+  go32_ops.to_close = go32_close;
+  go32_ops.to_detach = go32_detach;
+  go32_ops.to_resume = go32_resume;
+  go32_ops.to_wait = go32_wait;
+  go32_ops.to_fetch_registers = go32_fetch_registers;
+  go32_ops.to_store_registers = go32_store_registers;
+  go32_ops.to_prepare_to_store = go32_prepare_to_store;
+  go32_ops.to_xfer_memory = go32_xfer_memory;
+  go32_ops.to_files_info = go32_files_info;
+  go32_ops.to_insert_breakpoint = memory_insert_breakpoint;
+  go32_ops.to_remove_breakpoint = memory_remove_breakpoint;
+  go32_ops.to_terminal_init = ignore;
+  go32_ops.to_terminal_inferior = ignore;
+  go32_ops.to_terminal_ours_for_output = ignore;
+  go32_ops.to_terminal_ours = ignore;
+  go32_ops.to_terminal_info = ignore2;
+  go32_ops.to_kill = go32_kill_inferior;
+  go32_ops.to_create_inferior = go32_create_inferior;
+  go32_ops.to_mourn_inferior = go32_mourn_inferior;
+  go32_ops.to_can_run = go32_can_run;
+  go32_ops.to_stop = go32_stop;
+  go32_ops.to_stratum = process_stratum;
+  go32_ops.to_has_all_memory = 1;
+  go32_ops.to_has_memory = 1;
+  go32_ops.to_has_stack = 1;
+  go32_ops.to_has_registers = 1;
+  go32_ops.to_has_execution = 1;
+  go32_ops.to_magic = OPS_MAGIC;
+}
+
+void
+_initialize_go32_nat (void)
+{
+  init_go32_ops ();
+  add_target (&go32_ops);
+}
diff --git a/gdb/tic80-tdep.c b/gdb/tic80-tdep.c
new file mode 100644
index 00000000000..0abbb80dc1a
--- /dev/null
+++ b/gdb/tic80-tdep.c
@@ -0,0 +1,483 @@
+/* Target-dependent code for the TI TMS320C80 (MVP) for GDB, the GNU debugger.
+   Copyright 1996, Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "value.h"
+#include "frame.h"
+#include "inferior.h"
+#include "obstack.h"
+#include "target.h"
+#include "bfd.h"
+#include "gdb_string.h"
+#include "gdbcore.h"
+#include "symfile.h"
+
+/* Function: frame_find_saved_regs
+   Return the frame_saved_regs structure for the frame.
+   Doesn't really work for dummy frames, but it does pass back
+   an empty frame_saved_regs, so I guess that's better than total failure */
+
+void 
+tic80_frame_find_saved_regs (fi, regaddr)
+     struct frame_info *fi;
+     struct frame_saved_regs *regaddr;
+{
+  memcpy (regaddr, &fi->fsr, sizeof (struct frame_saved_regs));
+}
+
+/* Function: skip_prologue
+   Find end of function prologue.  */
+
+CORE_ADDR
+tic80_skip_prologue (pc)
+     CORE_ADDR pc;
+{
+  CORE_ADDR func_addr, func_end;
+  struct symtab_and_line sal;
+
+  /* See what the symbol table says */
+
+  if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+    {
+      sal = find_pc_line (func_addr, 0);
+
+      if (sal.line != 0 && sal.end < func_end)
+	return sal.end;
+      else
+	/* Either there's no line info, or the line after the prologue is after
+	   the end of the function.  In this case, there probably isn't a
+	   prologue.  */
+	return pc;
+    }
+
+  /* We can't find the start of this function, so there's nothing we can do. */
+  return pc;
+}
+
+/* Function: tic80_scan_prologue
+   This function decodes the target function prologue to determine:
+     1) the size of the stack frame
+     2) which registers are saved on it
+     3) the offsets of saved regs
+     4) the frame size
+   This information is stored in the "extra" fields of the frame_info.  */
+
+static void
+tic80_scan_prologue (fi)
+     struct frame_info *fi;
+{
+  struct symtab_and_line sal;
+  CORE_ADDR prologue_start, prologue_end, current_pc;
+
+  /* Assume there is no frame until proven otherwise.  */
+  fi->framereg = SP_REGNUM;
+  fi->framesize = 0;
+  fi->frameoffset = 0;
+
+  /* this code essentially duplicates skip_prologue, 
+     but we need the start address below.  */
+
+  if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end))
+    {
+      sal = find_pc_line (prologue_start, 0);
+
+      if (sal.line == 0)		/* no line info, use current PC */
+	if (prologue_start != entry_point_address ())
+	  prologue_end = fi->pc;
+	else
+	  return;			/* _start has no frame or prologue */
+      else if (sal.end < prologue_end)	/* next line begins after fn end */
+	prologue_end = sal.end;		/* (probably means no prologue)  */
+    }
+  else
+/* FIXME */
+    prologue_end = prologue_start + 40; /* We're in the boondocks: allow for */
+					/* 16 pushes, an add, and "mv fp,sp" */
+
+  prologue_end = min (prologue_end, fi->pc);
+
+  /* Now search the prologue looking for instructions that set up the
+     frame pointer, adjust the stack pointer, and save registers.  */
+
+  for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 4)
+    {
+      unsigned int insn;
+      int regno;
+      int offset = 0;
+
+      insn = read_memory_unsigned_integer (current_pc, 4);
+
+      if ((insn & 0x301000) == 0x301000)	/* Long immediate? */
+/* FIXME - set offset for long immediate instructions */
+	current_pc += 4;
+      else
+	{
+	  offset = insn & 0x7fff;		/* extract 15-bit offset */
+	  if (offset & 0x4000)			/* if negative, sign-extend */
+	    offset = -(0x8000 - offset);
+	}
+
+      if ((insn & 0x7fd0000) == 0x590000)	/* st.{w,d} reg, xx(r1) */
+	{
+	  regno = ((insn >> 27) & 0x1f);
+	  fi->fsr.regs[regno] = offset;
+	  if (insn & 0x8000)			/* 64-bit store (st.d)? */
+	    fi->fsr.regs[regno+1] = offset+4;
+	}
+      else if ((insn & 0xffff8000) == 0x086c8000)   /* addu xx, r1, r1 */
+	fi->framesize = -offset;
+      else if ((insn & 0xffff8000) == 0xf06c8000)  /* addu xx, r1, r30 */
+	{
+	  fi->framereg = FP_REGNUM;		/* fp is now valid */
+	  fi->frameoffset = offset;
+	  break;				/* end of stack adjustments */
+	}
+      else if (insn == 0xf03b2001)		/* addu r1, r0, r30 */
+	{
+	  fi->framereg = FP_REGNUM;		/* fp is now valid */
+	  fi->frameoffset = 0;
+	  break;				/* end of stack adjustments */
+	}
+      else
+/* FIXME - handle long immediate instructions */
+	break;				/* anything else isn't prologue */
+    }
+}
+
+/* Function: init_extra_frame_info
+   This function actually figures out the frame address for a given pc and
+   sp.  This is tricky on the c80 because we sometimes don't use an explicit
+   frame pointer, and the previous stack pointer isn't necessarily recorded
+   on the stack.  The only reliable way to get this info is to
+   examine the prologue.  */
+
+void
+tic80_init_extra_frame_info (fi)
+     struct frame_info *fi;
+{
+  int reg;
+
+  if (fi->next)
+    fi->pc = FRAME_SAVED_PC (fi->next);
+
+  /* Because zero is a valid register offset relative to SP, we initialize
+     the offsets to -1 to indicate unused entries.  */
+  for (reg = 0; reg < NUM_REGS; reg++)
+    fi->fsr.regs[reg] = -1;
+
+  if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+    {
+      /* We need to setup fi->frame here because run_stack_dummy gets it wrong
+	 by assuming it's always FP.  */
+      fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM);
+      fi->framesize = 0;
+      fi->frameoffset = 0;
+      return;
+    }
+  else 
+    {
+      tic80_scan_prologue (fi);
+
+      if (!fi->next)			/* this is the innermost frame? */
+	fi->frame = read_register (fi->framereg);
+      else			 	/* not the innermost frame */
+	/* If this function uses FP as the frame register, and the function
+	   it called saved the FP, get the saved FP.  */
+	if (fi->framereg == FP_REGNUM &&
+	    fi->next->fsr.regs[FP_REGNUM] != (unsigned) -1)
+	  fi->frame = read_memory_integer (fi->next->fsr.regs[FP_REGNUM], 4);
+
+      /* Convert SP-relative offsets of saved registers to real addresses.  */
+      for (reg = 0; reg < NUM_REGS; reg++)
+	if (fi->fsr.regs[reg] == (unsigned) -1)
+	    fi->fsr.regs[reg] = 0;	/* unused entry */
+	  else
+	    fi->fsr.regs[reg] += fi->frame - fi->frameoffset;
+    }
+}
+
+/* Function: find_callers_reg
+   Find REGNUM on the stack.  Otherwise, it's in an active register.  One thing
+   we might want to do here is to check REGNUM against the clobber mask, and
+   somehow flag it as invalid if it isn't saved on the stack somewhere.  This
+   would provide a graceful failure mode when trying to get the value of
+   caller-saves registers for an inner frame.  */
+
+CORE_ADDR
+tic80_find_callers_reg (fi, regnum)
+     struct frame_info *fi;
+     int regnum;
+{
+  for (; fi; fi = fi->next)
+    if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+      return generic_read_register_dummy (fi->pc, fi->frame, regnum);
+    else if (fi->fsr.regs[regnum] != 0)
+      return read_memory_integer (fi->fsr.regs[regnum], 
+				  REGISTER_RAW_SIZE(regnum));
+  return read_register (regnum);
+}
+
+/* Function: frame_chain
+   Given a GDB frame, determine the address of the calling function's frame.
+   This will be used to create a new GDB frame struct, and then
+   INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
+   For c80, we save the frame size when we initialize the frame_info.  */
+
+CORE_ADDR
+tic80_frame_chain (fi)
+     struct frame_info *fi;
+{
+  CORE_ADDR fn_start, callers_pc, fp;
+
+  /* is this a dummy frame? */
+  if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame))
+    return fi->frame;	/* dummy frame same as caller's frame */
+
+  /* is caller-of-this a dummy frame? */
+  callers_pc = FRAME_SAVED_PC(fi);  /* find out who called us: */
+  fp = tic80_find_callers_reg (fi, FP_REGNUM);
+  if (PC_IN_CALL_DUMMY(callers_pc, fp, fp))	
+    return fp;		/* dummy frame's frame may bear no relation to ours */
+
+  if (find_pc_partial_function (fi->pc, 0, &fn_start, 0))
+    if (fn_start == entry_point_address ())
+      return 0;		/* in _start fn, don't chain further */
+
+  if (fi->framereg == FP_REGNUM)
+    return tic80_find_callers_reg (fi, FP_REGNUM);
+  else
+    return fi->frame + fi->framesize;
+}
+
+/* Function: pop_frame
+   Discard from the stack the innermost frame,
+   restoring all saved registers.  */
+
+struct frame_info *
+tic80_pop_frame (frame)
+     struct frame_info *frame;
+{
+  int regnum;
+
+  if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
+    generic_pop_dummy_frame ();
+  else
+    {
+      for (regnum = 0; regnum < NUM_REGS; regnum++)
+	if (frame->fsr.regs[regnum] != 0)
+	  write_register (regnum, 
+			  read_memory_integer (frame->fsr.regs[regnum], 4));
+
+      write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
+      write_register (SP_REGNUM, read_register (FP_REGNUM));
+#if 0
+      if (read_register (PSW_REGNUM) & 0x80)
+	write_register (SPU_REGNUM, read_register (SP_REGNUM));
+      else
+	write_register (SPI_REGNUM, read_register (SP_REGNUM));
+#endif
+    }
+  flush_cached_frames ();
+  return NULL;
+}
+
+/* Function: frame_saved_pc
+   Find the caller of this frame.  We do this by seeing if LR_REGNUM is saved
+   in the stack anywhere, otherwise we get it from the registers. */
+
+CORE_ADDR
+tic80_frame_saved_pc (fi)
+     struct frame_info *fi;
+{
+  if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame))
+    return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM);
+  else
+    return tic80_find_callers_reg (fi, LR_REGNUM);
+}
+
+/* Function: tic80_push_return_address (pc, sp)
+   Set up the return address for the inferior function call.
+   Necessary for targets that don't actually execute a JSR/BSR instruction 
+   (ie. when using an empty CALL_DUMMY) */
+
+CORE_ADDR
+tic80_push_return_address (pc, sp)
+     CORE_ADDR pc;
+     CORE_ADDR sp;
+{
+  write_register (LR_REGNUM, CALL_DUMMY_ADDRESS ());
+  return sp;
+}
+
+
+/* Function: push_arguments
+   Setup the function arguments for calling a function in the inferior.
+
+   On the TI C80 architecture, there are six register pairs (R2/R3 to R12/13)
+   which are dedicated for passing function arguments.  Up to the first six
+   arguments (depending on size) may go into these registers.
+   The rest go on the stack.
+
+   Arguments that are smaller than 4 bytes will still take up a whole
+   register or a whole 32-bit word on the stack, and will be
+   right-justified in the register or the stack word.  This includes
+   chars, shorts, and small aggregate types.
+ 
+   Arguments that are four bytes or less in size are placed in the
+   even-numbered register of a register pair, and the odd-numbered
+   register is not used.
+
+   Arguments of 8 bytes size (such as floating point doubles) are placed
+   in a register pair.  The least significant 32-bit word is placed in
+   the even-numbered register, and the most significant word in the
+   odd-numbered register.
+
+   Aggregate types with sizes between 4 and 8 bytes are passed
+   entirely on the stack, and are left-justified within the
+   double-word (as opposed to aggregates smaller than 4 bytes
+   which are right-justified).
+
+   Aggregates of greater than 8 bytes are first copied onto the stack, 
+   and then a pointer to the copy is passed in the place of the normal
+   argument (either in a register if available, or on the stack).
+
+   Functions that must return an aggregate type can return it in the 
+   normal return value registers (R2 and R3) if its size is 8 bytes or
+   less.  For larger return values, the caller must allocate space for 
+   the callee to copy the return value to.  A pointer to this space is
+   passed as an implicit first argument, always in R0. */
+
+CORE_ADDR
+tic80_push_arguments (nargs, args, sp, struct_return, struct_addr)
+     int nargs;
+     value_ptr *args;
+     CORE_ADDR sp;
+     unsigned char struct_return;
+     CORE_ADDR struct_addr;
+{
+  int stack_offset, stack_alloc;
+  int argreg;
+  int argnum;
+  struct type *type;
+  CORE_ADDR regval;
+  char *val;
+  char valbuf[4];
+  int len;
+  int odd_sized_struct;
+  int is_struct;
+
+  /* first force sp to a 4-byte alignment */
+  sp = sp & ~3;
+
+  argreg = ARG0_REGNUM;  
+  /* The "struct return pointer" pseudo-argument goes in R0 */
+  if (struct_return)
+      write_register (argreg++, struct_addr);
+ 
+  /* Now make sure there's space on the stack */
+  for (argnum = 0, stack_alloc = 0;
+       argnum < nargs; argnum++)
+    stack_alloc += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3);
+  sp -= stack_alloc;    /* make room on stack for args */
+ 
+ 
+  /* Now load as many as possible of the first arguments into
+     registers, and push the rest onto the stack.  There are 16 bytes
+     in four registers available.  Loop thru args from first to last.  */
+ 
+  argreg = ARG0_REGNUM;
+  for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++)
+    {
+      type = VALUE_TYPE (args[argnum]);
+      len  = TYPE_LENGTH (type);
+      memset (valbuf, 0, sizeof (valbuf));
+      val = (char *) VALUE_CONTENTS (args[argnum]);
+ 
+/* FIXME -- tic80 can take doubleword arguments in register pairs */
+      is_struct = (type->code == TYPE_CODE_STRUCT);
+      odd_sized_struct = 0;
+
+      if (! is_struct)
+	{
+	  if (len < 4)
+	    { /* value gets right-justified in the register or stack word */
+	      memcpy (valbuf + (4 - len), val, len);
+	      val = valbuf;
+	    }
+	  if (len > 4 && (len & 3) != 0)
+	    odd_sized_struct = 1;     /* such structs go entirely on stack */
+	}
+      else
+	{
+	  /* Structs are always passed by reference. */
+	  write_register (argreg, sp + stack_offset);
+	  argreg ++;
+	}
+
+      while (len > 0)
+        {
+          if (is_struct || argreg > ARGLAST_REGNUM || odd_sized_struct)
+            {				/* must go on the stack */
+              write_memory (sp + stack_offset, val, 4);
+              stack_offset += 4;
+            }
+          /* NOTE WELL!!!!!  This is not an "else if" clause!!!
+             That's because some things get passed on the stack
+             AND in the registers!   */
+          if (!is_struct && argreg <= ARGLAST_REGNUM)
+            {				/* there's room in a register */
+              regval = extract_address (val, REGISTER_RAW_SIZE(argreg));
+              write_register (argreg, regval);
+	      argreg += 2;	/* FIXME -- what about doubleword args? */
+            }
+          /* Store the value 4 bytes at a time.  This means that things
+             larger than 4 bytes may go partly in registers and partly
+             on the stack.  */
+          len -= REGISTER_RAW_SIZE(argreg);
+          val += REGISTER_RAW_SIZE(argreg);
+        }
+    }
+  return sp;
+}
+
+/* Function: tic80_write_sp
+   Because SP is really a read-only register that mirrors either SPU or SPI,
+   we must actually write one of those two as well, depending on PSW. */
+
+void
+tic80_write_sp (val)
+     CORE_ADDR val;
+{
+#if 0
+  unsigned long psw = read_register (PSW_REGNUM);
+
+  if (psw & 0x80)	/* stack mode: user or interrupt */
+    write_register (SPU_REGNUM, val);
+  else
+    write_register (SPI_REGNUM, val);
+#endif
+  write_register (SP_REGNUM, val);
+}
+
+void
+_initialize_tic80_tdep ()
+{
+  tm_print_insn = print_insn_tic80;
+}
+