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259 lines
8.3 KiB
C
259 lines
8.3 KiB
C
/* Parameters for execution on a H8/300 series machine.
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Copyright 1992, 1993 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Contributed by Steve Chamberlain sac@cygnus.com */
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/* 1 if debugging H8/300H application */
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extern int h8300hmode;
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/* Number of bytes in a word */
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#define BINWORD (h8300hmode?4:2)
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#define EXTRA_FRAME_INFO \
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struct frame_saved_regs *fsr; \
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CORE_ADDR from_pc; \
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CORE_ADDR args_pointer;\
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CORE_ADDR locals_pointer ;
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/* Zero the frame_saved_regs pointer when the frame is initialized,
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so that FRAME_FIND_SAVED_REGS () will know to allocate and
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initialize a frame_saved_regs struct the first time it is called.
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Set the arg_pointer to -1, which is not valid; 0 and other values
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indicate real, cached values. */
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#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
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init_extra_frame_info (fromleaf, fi)
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extern void init_extra_frame_info ();
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#define IEEE_FLOAT
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/* Define the bit, byte, and word ordering of the machine. */
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#define TARGET_BYTE_ORDER BIG_ENDIAN
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#undef TARGET_INT_BIT
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#define TARGET_INT_BIT 16
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#undef TARGET_LONG_BIT
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#define TARGET_LONG_BIT 32
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#undef TARGET_PTR_BIT
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#define TARGET_PTR_BIT (h8300hmode ? 32:16)
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/* Offset from address of function to start of its code.
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Zero on most machines. */
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#define FUNCTION_START_OFFSET 0
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/* Advance PC across any function entry prologue instructions
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to reach some "real" code. */
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#define SKIP_PROLOGUE(ip) {(ip) = h8300_skip_prologue(ip);}
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extern CORE_ADDR h8300_skip_prologue ();
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/* Immediately after a function call, return the saved pc.
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Can't always go through the frames for this because on some machines
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the new frame is not set up until the new function executes
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some instructions. */
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#define SAVED_PC_AFTER_CALL(frame) \
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read_memory_unsigned_integer (read_register (SP_REGNUM), BINWORD)
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/* Stack grows downward. */
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#define INNER_THAN <
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/*#define BREAKPOINT {0x7A, 0xFF}*/
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#define BREAKPOINT {0x01, 0x80} /* Sleep */
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#define REMOTE_BREAKPOINT { 0x57, 0x30} /* trapa #3 */
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/* If your kernel resets the pc after the trap happens you may need to
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define this before including this file. */
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#define DECR_PC_AFTER_BREAK 0
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/* Nonzero if instruction at PC is a return instruction. */
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/* Allow any of the return instructions, including a trapv and a return
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from interupt. */
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#define ABOUT_TO_RETURN(pc) ((read_memory_unsigned_integer (pc, 2) & ~0x3) == 0x4e74)
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/* Say how long registers are. */
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#define REGISTER_SIZE 4
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#define NUM_REGS 13
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#define REGISTER_BYTES (NUM_REGS * 4)
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/* Index within `registers' of the first byte of the space for
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register N. */
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#define REGISTER_BYTE(N) ((N) * 4)
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/* Number of bytes of storage in the actual machine representation
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for register N. On the H8/300, all regs are 2 bytes. */
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#define REGISTER_RAW_SIZE(N) (h8300hmode ? 4 : 2)
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/* Number of bytes of storage in the program's representation
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for register N. */
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#define REGISTER_VIRTUAL_SIZE(N) (h8300hmode ? 4 : 2)
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/* Largest value REGISTER_RAW_SIZE can have. */
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#define MAX_REGISTER_RAW_SIZE 4
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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE 4
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/* Return the GDB type object for the "standard" data type
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of data in register N. */
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#define REGISTER_VIRTUAL_TYPE(N) \
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(h8300hmode ? builtin_type_unsigned_long : builtin_type_unsigned_short)
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/* Initializer for an array of names of registers.
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Entries beyond the first NUM_REGS are ignored. */
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#define REGISTER_NAMES \
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{"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"}
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/* Register numbers of various important registers.
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Note that some of these values are "real" register numbers,
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and correspond to the general registers of the machine,
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and some are "phony" register numbers which are too large
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to be actual register numbers as far as the user is concerned
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but do serve to get the desired values when passed to read_register. */
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#define FP_REGNUM 6 /* Contains address of executing stack frame */
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#define SP_REGNUM 7 /* Contains address of top of stack */
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#define CCR_REGNUM 8 /* Contains processor status */
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#define PC_REGNUM 9 /* Contains program counter */
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/* Extract from an array REGBUF containing the (raw) register state
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a function return value of type TYPE, and copy that, in virtual format,
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into VALBUF. */
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/* FIXME: Won't work with both h8/300's. */
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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memcpy (VALBUF, (char *)(REGBUF), TYPE_LENGTH(TYPE))
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/* Write into appropriate registers a function return value
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of type TYPE, given in virtual format. Assumes floats are passed
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in d0/d1. */
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/* FIXME: Won't work with both h8/300's. */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
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/* Extract from an array REGBUF containing the (raw) register state
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the address in which a function should return its structure value,
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as a CORE_ADDR (or an expression that can be used as one). */
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/* FIXME: Won't work with both h8/300's. */
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#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
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/* Describe the pointer in each stack frame to the previous stack frame
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(its caller). */
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/* FRAME_CHAIN takes a frame's nominal address
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and produces the frame's chain-pointer.
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However, if FRAME_CHAIN_VALID returns zero,
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it means the given frame is the outermost one and has no caller. */
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#define FRAME_CHAIN(FRAME) h8300_frame_chain(FRAME)
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struct frame_info ;
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CORE_ADDR h8300_frame_chain PARAMS ((struct frame_info *));
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/* In the case of the H8/300, the frame's nominal address
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is the address of a 2-byte word containing the calling frame's address. */
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/* Use the alternate method of avoiding running up off the end of
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the frame chain or following frames back into the startup code.
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See the comments in objfile.h */
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#define FRAME_CHAIN_VALID_ALTERNATE
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/* Define other aspects of the stack frame. */
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/* A macro that tells us whether the function invocation represented
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by FI does not have a frame on the stack associated with it. If it
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does not, FRAMELESS is set to 1, else 0. */
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#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
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(FRAMELESS) = frameless_look_for_prologue(FI)
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/* Any function with a frame looks like this
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SECOND ARG
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FIRST ARG
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RET PC
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SAVED R2
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SAVED R3
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SAVED FP <-FP POINTS HERE
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LOCALS0
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LOCALS1 <-SP POINTS HERE
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*/
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#define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
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#define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
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#define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
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/* Set VAL to the number of args passed to frame described by FI.
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Can set VAL to -1, meaning no way to tell. */
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/* We can't tell how many args there are
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now that the C compiler delays popping them. */
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#define FRAME_NUM_ARGS(val,fi) (val = -1)
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/* Return number of bytes at start of arglist that are not really args. */
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#define FRAME_ARGS_SKIP 0
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/* Put here the code to store, into a struct frame_saved_regs,
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the addresses of the saved registers of frame described by FRAME_INFO.
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This includes special registers such as pc and fp saved in special
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ways in the stack frame. sp is even more special:
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the address we return for it IS the sp for the next frame. */
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#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
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frame_find_saved_regs(frame_info, &(frame_saved_regs))
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/* Push an empty stack frame, to record the current PC, etc. */
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/*#define PUSH_DUMMY_FRAME { h8300_push_dummy_frame (); }*/
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/* Discard from the stack the innermost frame, restoring all registers. */
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#define POP_FRAME { h8300_pop_frame (); }
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typedef unsigned short INSN_WORD;
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#define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
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#define GDB_TARGET_IS_H8300
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#define NUM_REALREGS 10
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#define NOP { 0x01, 0x80} /* A sleep insn */
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