1 /* Parameters for execution on a H8/300 series machine.
2 Copyright 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* Contributed by Steve Chamberlain sac@cygnus.com */
23 /* 1 if debugging H8/300H application */
24 extern int h8300hmode
;
26 /* Number of bytes in a word */
28 #define BINWORD (h8300hmode?4:2)
30 #define EXTRA_FRAME_INFO \
31 struct frame_saved_regs *fsr; \
33 CORE_ADDR args_pointer;\
34 CORE_ADDR locals_pointer ;
36 /* Zero the frame_saved_regs pointer when the frame is initialized,
37 so that FRAME_FIND_SAVED_REGS () will know to allocate and
38 initialize a frame_saved_regs struct the first time it is called.
39 Set the arg_pointer to -1, which is not valid; 0 and other values
40 indicate real, cached values. */
42 #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
43 init_extra_frame_info (fromleaf, fi)
45 extern void init_extra_frame_info ();
48 /* Define the bit, byte, and word ordering of the machine. */
49 #define TARGET_BYTE_ORDER BIG_ENDIAN
51 #define TARGET_INT_BIT 16
52 #undef TARGET_LONG_BIT
53 #define TARGET_LONG_BIT 32
55 #define TARGET_PTR_BIT (h8300hmode ? 32:16)
57 /* Offset from address of function to start of its code.
58 Zero on most machines. */
60 #define FUNCTION_START_OFFSET 0
62 /* Advance PC across any function entry prologue instructions
63 to reach some "real" code. */
65 #define SKIP_PROLOGUE(ip) {(ip) = h8300_skip_prologue(ip);}
66 extern CORE_ADDR
h8300_skip_prologue ();
68 /* Immediately after a function call, return the saved pc.
69 Can't always go through the frames for this because on some machines
70 the new frame is not set up until the new function executes
73 #define SAVED_PC_AFTER_CALL(frame) \
74 read_memory_unsigned_integer (read_register (SP_REGNUM), BINWORD)
76 /* Stack grows downward. */
80 /*#define BREAKPOINT {0x7A, 0xFF}*/
81 #define BREAKPOINT {0x01, 0x80} /* Sleep */
82 #define REMOTE_BREAKPOINT { 0x57, 0x30} /* trapa #3 */
83 /* If your kernel resets the pc after the trap happens you may need to
84 define this before including this file. */
86 #define DECR_PC_AFTER_BREAK 0
88 /* Nonzero if instruction at PC is a return instruction. */
89 /* Allow any of the return instructions, including a trapv and a return
92 #define ABOUT_TO_RETURN(pc) ((read_memory_unsigned_integer (pc, 2) & ~0x3) == 0x4e74)
94 /* Say how long registers are. */
96 #define REGISTER_SIZE 4
100 #define REGISTER_BYTES (NUM_REGS * 4)
102 /* Index within `registers' of the first byte of the space for
105 #define REGISTER_BYTE(N) ((N) * 4)
107 /* Number of bytes of storage in the actual machine representation
108 for register N. On the H8/300, all regs are 2 bytes. */
110 #define REGISTER_RAW_SIZE(N) (h8300hmode ? 4 : 2)
112 /* Number of bytes of storage in the program's representation
115 #define REGISTER_VIRTUAL_SIZE(N) (h8300hmode ? 4 : 2)
117 /* Largest value REGISTER_RAW_SIZE can have. */
119 #define MAX_REGISTER_RAW_SIZE 4
121 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
123 #define MAX_REGISTER_VIRTUAL_SIZE 4
125 /* Return the GDB type object for the "standard" data type
126 of data in register N. */
128 #define REGISTER_VIRTUAL_TYPE(N) \
129 (h8300hmode ? builtin_type_unsigned_long : builtin_type_unsigned_short)
131 /* Initializer for an array of names of registers.
132 Entries beyond the first NUM_REGS are ignored. */
134 #define REGISTER_NAMES \
135 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"}
137 /* Register numbers of various important registers.
138 Note that some of these values are "real" register numbers,
139 and correspond to the general registers of the machine,
140 and some are "phony" register numbers which are too large
141 to be actual register numbers as far as the user is concerned
142 but do serve to get the desired values when passed to read_register. */
144 #define FP_REGNUM 6 /* Contains address of executing stack frame */
145 #define SP_REGNUM 7 /* Contains address of top of stack */
146 #define CCR_REGNUM 8 /* Contains processor status */
147 #define PC_REGNUM 9 /* Contains program counter */
149 /* Extract from an array REGBUF containing the (raw) register state
150 a function return value of type TYPE, and copy that, in virtual format,
153 /* FIXME: Won't work with both h8/300's. */
155 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
156 memcpy (VALBUF, (char *)(REGBUF), TYPE_LENGTH(TYPE))
158 /* Write into appropriate registers a function return value
159 of type TYPE, given in virtual format. Assumes floats are passed
161 /* FIXME: Won't work with both h8/300's. */
163 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
164 write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
166 /* Extract from an array REGBUF containing the (raw) register state
167 the address in which a function should return its structure value,
168 as a CORE_ADDR (or an expression that can be used as one). */
169 /* FIXME: Won't work with both h8/300's. */
171 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
173 /* Describe the pointer in each stack frame to the previous stack frame
176 /* FRAME_CHAIN takes a frame's nominal address
177 and produces the frame's chain-pointer.
179 However, if FRAME_CHAIN_VALID returns zero,
180 it means the given frame is the outermost one and has no caller. */
182 #define FRAME_CHAIN(FRAME) h8300_frame_chain(FRAME)
184 CORE_ADDR h8300_frame_chain
PARAMS ((struct frame_info
*));
186 /* In the case of the H8/300, the frame's nominal address
187 is the address of a 2-byte word containing the calling frame's address. */
189 /* Use the alternate method of avoiding running up off the end of
190 the frame chain or following frames back into the startup code.
191 See the comments in objfile.h */
193 #define FRAME_CHAIN_VALID_ALTERNATE
195 /* Define other aspects of the stack frame. */
197 /* A macro that tells us whether the function invocation represented
198 by FI does not have a frame on the stack associated with it. If it
199 does not, FRAMELESS is set to 1, else 0. */
200 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
201 (FRAMELESS) = frameless_look_for_prologue(FI)
203 /* Any function with a frame looks like this
209 SAVED FP <-FP POINTS HERE
211 LOCALS1 <-SP POINTS HERE
214 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
216 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
218 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
220 /* Set VAL to the number of args passed to frame described by FI.
221 Can set VAL to -1, meaning no way to tell. */
223 /* We can't tell how many args there are
224 now that the C compiler delays popping them. */
226 #define FRAME_NUM_ARGS(val,fi) (val = -1)
228 /* Return number of bytes at start of arglist that are not really args. */
230 #define FRAME_ARGS_SKIP 0
232 /* Put here the code to store, into a struct frame_saved_regs,
233 the addresses of the saved registers of frame described by FRAME_INFO.
234 This includes special registers such as pc and fp saved in special
235 ways in the stack frame. sp is even more special:
236 the address we return for it IS the sp for the next frame. */
238 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
239 frame_find_saved_regs(frame_info, &(frame_saved_regs))
242 /* Push an empty stack frame, to record the current PC, etc. */
244 /*#define PUSH_DUMMY_FRAME { h8300_push_dummy_frame (); }*/
246 /* Discard from the stack the innermost frame, restoring all registers. */
248 #define POP_FRAME { h8300_pop_frame (); }
250 typedef unsigned short INSN_WORD
;
253 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
255 #define GDB_TARGET_IS_H8300
257 #define NUM_REALREGS 10
258 #define NOP { 0x01, 0x80} /* A sleep insn */