Stubs to get things going

1 files changed, 264 insertions, 0 deletions

diff --git a/gdb/tm-h8300.h b/gdb/tm-h8300.h
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+/* Parameters for execution on a H8/300 series machine.
+   Copyright (C) 1992 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Contributed by Steve Chamberlain sac@cygnus.com */
+
+#define IEEE_FLOAT 1
+
+/* Define the bit, byte, and word ordering of the machine.  */
+#define TARGET_BYTE_ORDER BIG_ENDIAN
+
+#define TARGET_CHAR_BIT 8
+#define TARGET_SHORT_BIT 16
+#define TARGET_INT_BIT 16
+#define TARGET_LONG_BIT 32
+#define TARGET_LONG_LONG_BIT 64
+#define TARGET_FLOAT_BIT 32
+#define TARGET_DOUBLE_BIT 64
+
+
+/* Offset from address of function to start of its code.
+   Zero on most machines.  */
+
+#define FUNCTION_START_OFFSET 0
+
+/* Advance PC across any function entry prologue instructions
+   to reach some "real" code.  */
+
+
+#define SKIP_PROLOGUE(ip)   {(ip) = h8300_skip_prologue(ip);}
+extern CORE_ADDR h8300_skip_prologue ();
+
+
+/* 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_memory_integer (read_register (SP_REGNUM), 2)
+
+/* Stack grows downward.  */
+
+#define INNER_THAN <
+
+/* Sequence of bytes for breakpoint instruction.
+   This is a TRAP instruction.  The last 4 bits (0xf below) is the
+   vector.  Systems which don't use 0xf should define BPT_VECTOR
+   themselves before including this file.  */
+
+
+#define BPT_VECTOR 0xf
+
+
+
+#define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)}
+
+
+/* If your kernel resets the pc after the trap happens you may need to
+   define this before including this file.  */
+
+
+#define DECR_PC_AFTER_BREAK 2
+
+
+/* Nonzero if instruction at PC is a return instruction.  */
+/* Allow any of the return instructions, including a trapv and a return
+   from interupt.  */
+
+#define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74)
+
+/* Return 1 if P points to an invalid floating point value.  */
+
+#define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
+
+/* Say how long registers are.  */
+
+#define REGISTER_TYPE short
+
+#  define NUM_REGS 10 
+#  define REGISTER_BYTES (10*2)
+
+
+/* Index within `registers' of the first byte of the space for
+   register N.  */
+
+#define REGISTER_BYTE(N)  ((N) * 2)
+
+/* Number of bytes of storage in the actual machine representation
+   for register N.  On the H8/300, all regs are 2 bytes.  */
+
+#define REGISTER_RAW_SIZE(N) 2
+
+/* Number of bytes of storage in the program's representation
+   for register N.  On the H8/300, all regs are 2 bytes.  */
+
+#define REGISTER_VIRTUAL_SIZE(N) 2
+
+/* Largest value REGISTER_RAW_SIZE can have.  */
+
+#define MAX_REGISTER_RAW_SIZE 2
+
+/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
+
+#define MAX_REGISTER_VIRTUAL_SIZE 2
+
+/* 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), 2);
+
+/* 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), 2);
+
+/* Return the GDB type object for the "standard" data type
+   of data in register N.  */
+
+#define REGISTER_VIRTUAL_TYPE(N)  builtin_type_int
+
+
+/* Initializer for an array of names of registers.
+   Entries beyond the first NUM_REGS are ignored.  */
+
+#define REGISTER_NAMES  \
+ {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp","ccr","pc"} 
+
+
+/* Register numbers of various important registers.
+   Note that some of these values are "real" register numbers,
+   and correspond to the general registers of the machine,
+   and some are "phony" register numbers which are too large
+   to be actual register numbers as far as the user is concerned
+   but do serve to get the desired values when passed to read_register.  */
+
+
+#define FP_REGNUM 6		/* Contains address of executing stack frame */
+#define SP_REGNUM 7		/* Contains address of top of stack */
+#define CCR_REGNUM 8		/* Contains processor status */
+#define PC_REGNUM 9		/* Contains program counter */
+
+/* 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 (0, (ADDR)); abort(); }
+
+/* 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.  This is assuming that floating point values are returned
+   as doubles in d0/d1.  */
+
+
+#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
+  bcopy ((char *)(REGBUF) +						\
+	         (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)),	\
+	 VALBUF, TYPE_LENGTH(TYPE))
+
+
+/* Write into appropriate registers a function return value
+   of type TYPE, given in virtual format.  Assumes floats are passed
+   in d0/d1.  */
+
+
+#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) (*(CORE_ADDR *)(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.
+
+   However, if FRAME_CHAIN_VALID returns zero,
+   it means the given frame is the outermost one and has no caller.  */
+
+/* In the case of the H8/300, the frame's nominal address
+   is the address of a 2-byte word containing the calling frame's address.  */
+
+
+
+
+/* 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 */
+   
+#define FRAME_CHAIN_VALID(chain, thisframe)	\
+  (chain != 0 					\
+   && !(inside_main_scope ((thisframe)->pc))	\
+   && !(inside_entry_scope ((thisframe)->pc)))
+
+
+/* Define other aspects of the stack frame.  */
+
+/* A macro that tells us whether the function invocation represented
+   by FI does not have a frame on the stack associated with it.  If it
+   does not, FRAMELESS is set to 1, else 0.  */
+#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
+  (FRAMELESS) = frameless_look_for_prologue(FI)
+
+#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 2, 2))
+
+#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
+
+#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
+
+/* 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
+   now that the C compiler delays popping them.  */
+
+#define FRAME_NUM_ARGS(val,fi) (val = -1)
+
+
+/* Return number of bytes at start of arglist that are not really args.  */
+
+#define FRAME_ARGS_SKIP 4
+
+/* 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)	      abort();
+
+
+/* Push an empty stack frame, to record the current PC, etc.  */
+
+#define PUSH_DUMMY_FRAME	{ h8300_push_dummy_frame (); }
+
+/* Discard from the stack the innermost frame, restoring all registers.  */
+
+#define POP_FRAME		{ h8300_pop_frame (); }
+