mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-03 04:12:10 +08:00
265 lines
8.1 KiB
C
265 lines
8.1 KiB
C
/* 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 (); }
|
||
|