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+/* Definitions to make GDB target for a tahoe running 4.3-Reno.
+   Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB 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 1, or (at your option)
+any later version.
+
+GDB 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 GDB; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/*
+ * Ported by the State University of New York at Buffalo by the Distributed
+ * Computer Systems Lab, Department of Computer Science, 1991.
+ */
+
+#define TARGET_BYTE_ORDER BIG_ENDIAN
+#define BITS_BIG_ENDIAN 0
+
+/* 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
+
+/* Debugger information will be in DBX format.  */
+
+#define READ_DBX_FORMAT
+
+/* Offset from address of function to start of its code.
+   Zero on most machines.  */
+
+#define FUNCTION_START_OFFSET 2
+
+/* Advance PC across any function entry prologue instructions
+   to reach some "real" code.  */
+
+#define SKIP_PROLOGUE(pc)	\
+{ register int op = (unsigned char) read_memory_integer (pc, 1);  \
+  if (op == 0x11) pc += 2;  /* skip brb */			  \
+  if (op == 0x13) pc += 3;  /* skip brw */			  \
+  if (op == 0x2c &&						  \
+      ((unsigned char) read_memory_integer (pc+2, 1)) == 0x5e)	  \
+    pc += 3;  /* skip subl2 */					  \
+  if (op == 0xe9 &&						  \
+      ((unsigned char) read_memory_integer (pc+1, 1)) == 0xae &&  \
+      ((unsigned char) read_memory_integer(pc+3, 1)) == 0x5e)	  \
+     pc += 4;  /* skip movab */					  \
+  if (op == 0xe9 &&						  \
+      ((unsigned char) read_memory_integer (pc+1, 1)) == 0xce &&  \
+      ((unsigned char) read_memory_integer(pc+4, 1)) == 0x5e)	  \
+    pc += 5;  /* skip movab */					  \
+  if (op == 0xe9 &&						  \
+      ((unsigned char) read_memory_integer (pc+1, 1)) == 0xee &&  \
+      ((unsigned char) read_memory_integer(pc+6, 1)) == 0x5e)	  \
+    pc += 7;  /* skip movab */					  \
+}
+
+/* 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) FRAME_SAVED_PC(frame)
+
+/* Wrong for cross-debugging.  I don't know the real values.  */
+#define TARGET_UPAGES UPAGES
+#define TARGET_NBPG NBPG
+
+/* This is the amount to subtract from u.u_ar0
+   to get the offset in the core file of the register values.  */
+
+#define KERNEL_U_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
+
+/* Address of end of stack space.  */
+
+#define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
+
+/* On BSD, sigtramp is in the u area.  Can't check the exact
+   addresses because for cross-debugging we don't have target include
+   files around.  This should be close enough.  */
+#define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000))
+
+/* Stack grows downward.  */
+
+#define INNER_THAN <
+
+/* Sequence of bytes for breakpoint instruction.  */
+
+#define BREAKPOINT {0x30}
+
+/* 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
+
+/* Nonzero if instruction at PC is a return instruction.  */
+
+#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x40)
+
+/* Return 1 if P points to an invalid floating point value.
+   LEN is the length in bytes -- not relevant on the Tahoe. */
+
+#define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
+
+/* Say how long (ordinary) registers are.  */
+
+#define REGISTER_TYPE long
+
+/* Number of machine registers */
+
+#define NUM_REGS 19
+
+/* Initializer for an array of names of registers.
+   There should be NUM_REGS strings in this initializer.  */
+
+#define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "fp", "sp", "pc", "ps", "al", "ah"}
+
+#define FP_REGNUM 13		/* Contains address of executing stack frame */
+#define SP_REGNUM 14		/* Contains address of top of stack */
+#define PC_REGNUM 15		/* Contains program counter */
+#define PS_REGNUM 16		/* Contains processor status */
+
+#define AL_REGNUM 17		/* Contains accumulator */
+#define AH_REGNUM 18
+
+/* Total amount of space needed to store our copies of the machine's
+   register state, the array `registers'.  */
+
+#define REGISTER_BYTES (19*4)
+
+/* Index within `registers' of the first byte of the space for
+   register N.  */
+
+#define REGISTER_BYTE(N) ((N) * 4)
+
+/* Number of bytes of storage in the actual machine representation
+   for register N.  On the tahoe, all regs are 4 bytes.  */
+
+#define REGISTER_RAW_SIZE(N) 4
+
+/* Number of bytes of storage in the program's representation
+   for register N.  On the tahoe, all regs are 4 bytes.  */
+
+#define REGISTER_VIRTUAL_SIZE(N) 4
+
+/* Largest value REGISTER_RAW_SIZE can have.  */
+
+#define MAX_REGISTER_RAW_SIZE 4
+
+/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
+
+#define MAX_REGISTER_VIRTUAL_SIZE 4
+
+/* Nonzero if register N requires conversion
+   from raw format to virtual format.  */
+
+#define REGISTER_CONVERTIBLE(N) 0
+
+/* Convert data from raw format for register REGNUM
+   to virtual format for register REGNUM.  */
+
+#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)	\
+  bcopy ((FROM), (TO), 4);
+
+/* Convert data from virtual format for register REGNUM
+   to raw format for register REGNUM.  */
+
+#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)	\
+  bcopy ((FROM), (TO), 4);
+
+/* Return the GDB type object for the "standard" data type
+   of data in register N.  */
+
+#define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
+
+/* Store the address of the place in which to copy the structure the
+   subroutine will return.  This is called from call_function. */
+
+#define STORE_STRUCT_RETURN(ADDR, SP) \
+  { write_register (1, (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) \
+  bcopy (REGBUF, VALBUF, 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 (0, VALBUF, TYPE_LENGTH (TYPE))
+
+/* Extract from an array REGBUF containing the (raw) register state
+   the address in which a function should return its structure value,
+   as a CORE_ADDR (or an expression that can be used as one).  */
+
+#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
+
+/* 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.
+
+   FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
+   and produces the nominal address of the caller frame.
+
+   However, if FRAME_CHAIN_VALID returns zero,
+   it means the given frame is the outermost one and has no caller.
+   In that case, FRAME_CHAIN_COMBINE is not used.  */
+
+/* In the case of the Tahoe, the frame's nominal address is the FP value,
+   and it points to the old FP */
+
+#define FRAME_CHAIN(thisframe)  \
+  (outside_startup_file ((thisframe)->pc) ? \
+   read_memory_integer ((thisframe)->frame, 4) :\
+   0)
+
+#define FRAME_CHAIN_VALID(chain, thisframe) \
+  (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
+
+#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
+
+/* Define other aspects of the stack frame.  */
+
+/* Saved PC */
+
+#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4))
+
+/* In most of GDB, getting the args address is too important to
+   just say "I don't know". */
+
+#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame+4)
+
+/* Address to use as an anchor for finding local variables */
+
+#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
+
+/* Return number of args passed to a frame.
+   Can return -1, meaning no way to tell.  */
+
+#define FRAME_NUM_ARGS(numargs, fi)  \
+{ numargs = ((0xffff & read_memory_integer(((fi)->frame-4),4)) - 4) >> 2; }
+
+/* Return number of bytes at start of arglist that are not really args.  */
+
+#define FRAME_ARGS_SKIP 0
+
+/* 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) \
+{ register int regnum;     \
+  register int rmask = read_memory_integer ((frame_info)->frame-4, 4) >> 16;\
+  register CORE_ADDR next_addr;     \
+  bzero (&frame_saved_regs, sizeof frame_saved_regs);     \
+  next_addr = (frame_info)->frame - 8;     \
+  for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1)  \
+    (frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\
+  (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;  \
+  (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8;  \
+  (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;      \
+}
+
+/* Things needed for making the inferior call functions.  */
+
+/* Push an empty stack frame, to record the current PC, etc.  */
+
+#define PUSH_DUMMY_FRAME \
+{ register CORE_ADDR sp = read_register (SP_REGNUM);	\
+  register int regnum;					\
+printf("PUSH_DUMMY_FRAME\n");				\
+  sp = push_word (sp, read_register (FP_REGNUM));	\
+  write_register (FP_REGNUM, sp);			\
+  sp = push_word (sp, 0x1fff0004);   /*SAVE MASK*/	\
+  sp = push_word (sp, read_register (PC_REGNUM));	\
+  for (regnum = 12; regnum >= 0; regnum--)		\
+    sp = push_word (sp, read_register (regnum));	\
+  write_register (SP_REGNUM, sp);			\
+}
+
+/* Discard from the stack the innermost frame, restoring all registers.  */
+
+#define POP_FRAME  \
+{ register CORE_ADDR fp = read_register (FP_REGNUM);			\
+  register int regnum;							\
+  register int regmask = read_memory_integer (fp-4, 4);			\
+printf("POP_FRAME\n");							\
+  regmask >>= 16;                                               	\
+  write_register (SP_REGNUM, fp+4);	                           	\
+  write_register (PC_REGNUM, read_memory_integer(fp-8, 4));	  	\
+  write_register (FP_REGNUM, read_memory_integer(fp, 4));  		\
+  fp -= 8;								\
+  for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1)		\
+    if (regmask & 0x1000)                                            	\
+      write_register (regnum, read_memory_integer (fp-=4, 4));		\
+  flush_cached_frames ();						\
+  set_current_frame (create_new_frame (read_register (FP_REGNUM),	\
+					read_pc ())); }
+
+/* This sequence of words is the instructions
+     calls #69, @#32323232
+     bpt
+   Note this is 8 bytes.  */
+
+#define CALL_DUMMY {0xbf699f32, 0x32323230}
+
+/* Start execution at beginning of dummy */
+
+#define CALL_DUMMY_START_OFFSET 0
+
+/* Insert the specified number of args and function address
+   into a call sequence of the above form stored at DUMMYNAME.  */
+
+#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, type)   \
+{ int temp = (int) fun;				\
+  *((char *) dummyname + 1) = nargs;		\
+  bcopy(&temp,(char *)dummyname+3,4); }
+