1 /* Parameters for execution on a z8000 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. */
23 #undef TARGET_LONG_BIT
24 #undef TARGET_SHORT_BIT
27 #define TARGET_SHORT_BIT 16
28 #define TARGET_INT_BIT 16
29 #define TARGET_LONG_BIT 32
30 #define TARGET_PTR_BIT (BIG ? 32: 16)
32 /* Define the bit, byte, and word ordering of the machine. */
33 #define TARGET_BYTE_ORDER BIG_ENDIAN
35 /* Offset from address of function to start of its code.
36 Zero on most machines. */
38 #define FUNCTION_START_OFFSET 0
40 /* Advance PC across any function entry prologue instructions
41 to reach some "real" code. */
43 #define SKIP_PROLOGUE(ip) {(ip) = z8k_skip_prologue(ip);}
44 extern CORE_ADDR mz8k_skip_prologue
PARAMS ((CORE_ADDR ip
));
47 /* Immediately after a function call, return the saved pc.
48 Can't always go through the frames for this because on some machines
49 the new frame is not set up until the new function executes
52 #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call(frame)
54 /* Stack grows downward. */
58 /* Sequence of bytes for breakpoint instruction. */
60 #define BREAKPOINT {0x36,0x00}
62 /* If your kernel resets the pc after the trap happens you may need to
63 define this before including this file. */
65 #define DECR_PC_AFTER_BREAK 0
67 /* Nonzero if instruction at PC is a return instruction. */
68 /* Allow any of the return instructions, including a trapv and a return
71 #define ABOUT_TO_RETURN(pc) about_to_return(pc)
73 /* Return 1 if P points to an invalid floating point value. */
75 #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
77 /* Say how long registers are. */
79 #define REGISTER_TYPE unsigned int
81 #define NUM_REGS 23 /* 16 registers + 1 ccr + 1 pc + 3 debug
82 regs + fake fp + fake sp*/
83 #define REGISTER_BYTES (NUM_REGS *4)
85 /* Index within `registers' of the first byte of the space for
88 #define REGISTER_BYTE(N) ((N)*4)
90 /* Number of bytes of storage in the actual machine representation
91 for register N. On the z8k, all but the pc are 2 bytes, but we
92 keep them all as 4 bytes and trim them on I/O */
95 #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
97 /* Number of bytes of storage in the program's representation
100 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
102 /* Largest value REGISTER_RAW_SIZE can have. */
104 #define MAX_REGISTER_RAW_SIZE 4
106 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
108 #define MAX_REGISTER_VIRTUAL_SIZE 4
110 /* Nonzero if register N requires conversion
111 from raw format to virtual format. */
113 #define REGISTER_CONVERTIBLE(N) 0
115 /* Convert data from raw format for register REGNUM
116 to virtual format for register REGNUM. */
118 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
119 register_convert_to_virtual(REGNUM, FROM, TO)
121 /* Convert data from virtual format for register REGNUM
122 to raw format for register REGNUM. */
124 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
125 register_convert_to_raw(REGNUM, FROM, TO)
127 /* Return the GDB type object for the "standard" data type
128 of data in register N. */
130 #define REGISTER_VIRTUAL_TYPE(N) \
131 (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
133 /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y)*/
134 /* Initializer for an array of names of registers.
135 Entries beyond the first NUM_REGS are ignored. */
137 #define REGISTER_NAMES \
138 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
139 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
140 "ccr", "pc", "cycles","insts","time","fp","sp"}
142 /* Register numbers of various important registers.
143 Note that some of these values are "real" register numbers,
144 and correspond to the general registers of the machine,
145 and some are "phony" register numbers which are too large
146 to be actual register numbers as far as the user is concerned
147 but do serve to get the desired values when passed to read_register. */
149 #define CCR_REGNUM 16 /* Contains processor status */
150 #define PC_REGNUM 17 /* Contains program counter */
151 #define CYCLES_REGNUM 18
152 #define INSTS_REGNUM 19
153 #define TIME_REGNUM 20
154 #define FP_REGNUM 21 /* Contains fp, whatever memory model */
155 #define SP_REGNUM 22 /* Conatins sp, whatever memory model */
159 #define PTR_SIZE (BIG ? 4: 2)
160 #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
162 /* Store the address of the place in which to copy the structure the
163 subroutine will return. This is called from call_function. */
165 #define STORE_STRUCT_RETURN(ADDR, SP) abort();
167 /* Extract from an array REGBUF containing the (raw) register state
168 a function return value of type TYPE, and copy that, in virtual format,
169 into VALBUF. This is assuming that floating point values are returned
170 as doubles in d0/d1. */
173 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
174 memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE));
176 /* Write into appropriate registers a function return value
177 of type TYPE, given in virtual format. */
179 #define STORE_RETURN_VALUE(TYPE,VALBUF) abort();
181 /* Extract from an array REGBUF containing the (raw) register state
182 the address in which a function should return its structure value,
183 as a CORE_ADDR (or an expression that can be used as one). */
185 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
187 /* Describe the pointer in each stack frame to the previous stack frame
190 /* FRAME_CHAIN takes a frame's nominal address and produces the frame's
192 In the case of the Z8000, the frame's nominal address
193 is the address of a ptr sized byte word containing the calling
196 #define FRAME_CHAIN(thisframe) frame_chain(thisframe);
200 /* Define other aspects of the stack frame. */
202 /* A macro that tells us whether the function invocation represented
203 by FI does not have a frame on the stack associated with it. If it
204 does not, FRAMELESS is set to 1, else 0. */
205 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
206 (FRAMELESS) = frameless_look_for_prologue(FI)
208 #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME)
210 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
212 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
214 /* Set VAL to the number of args passed to frame described by FI.
215 Can set VAL to -1, meaning no way to tell. */
217 /* We can't tell how many args there are
218 now that the C compiler delays popping them. */
219 #if !defined (FRAME_NUM_ARGS)
220 #define FRAME_NUM_ARGS(val,fi) (val = -1)
223 /* Return number of bytes at start of arglist that are not really args. */
225 #define FRAME_ARGS_SKIP 8
229 /* Things needed for making the inferior call functions.
230 It seems like every m68k based machine has almost identical definitions
231 in the individual machine's configuration files. Most other cpu types
232 (mips, i386, etc) have routines in their *-tdep.c files to handle this
233 for most configurations. The m68k family should be able to do this as
234 well. These macros can still be overridden when necessary. */
236 /* The CALL_DUMMY macro is the sequence of instructions, as disassembled
239 fmovemx fp0-fp7,sp@- 0xf227 0xe0ff
240 moveml d0-a5,sp@- 0x48e7 0xfffc
242 movew ccr,sp@- 0x42e7
244 /..* The arguments are pushed at this point by GDB;
245 no code is needed in the dummy for this.
246 The CALL_DUMMY_START_OFFSET gives the position of
247 the following jsr instruction. *../
249 jsr @#0x32323232 0x4eb9 0x3232 0x3232
250 addal #0x69696969,sp 0xdffc 0x6969 0x6969
251 trap #<your BPT_VECTOR number here> 0x4e4?
254 Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
255 We actually start executing at the jsr, since the pushing of the
256 registers is done by PUSH_DUMMY_FRAME. If this were real code,
257 the arguments for the function called by the jsr would be pushed
258 between the moveml and the jsr, and we could allow it to execute through.
259 But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
260 done, and we cannot allow the moveml to push the registers again lest
261 they be taken for the arguments. */
264 #define CALL_DUMMY { 0 }
265 #define CALL_DUMMY_LENGTH 24 /* Size of CALL_DUMMY */
266 #define CALL_DUMMY_START_OFFSET 8 /* Offset to jsr instruction*/
269 /* Insert the specified number of args and function address
270 into a call sequence of the above form stored at DUMMYNAME.
271 We use the BFD routines to store a big-endian value of known size. */
273 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
274 { bfd_putb32 (fun, (char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \
275 bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
277 /* Push an empty stack frame, to record the current PC, etc. */
279 #define PUSH_DUMMY_FRAME { z8k_push_dummy_frame (); }
281 extern void z8k_push_dummy_frame
PARAMS ((void));
283 extern void z8k_pop_frame
PARAMS ((void));
285 /* Discard from the stack the innermost frame, restoring all registers. */
287 #define POP_FRAME { z8k_pop_frame (); }
289 /* Offset from SP to first arg on stack at first instruction of a function */
291 #define SP_ARG0 (1 * 4)
293 #define ADDR_BITS_REMOVE(x) addr_bits_remove(x)
294 #define ADDR_BITS_SET(x) addr_bits_set(x)
296 #define BIG (z8001_mode)
298 #define read_memory_short(x) (read_memory_integer(x,2) & 0xffff)
302 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
305 #define INIT_EXTRA_SYMTAB_INFO \
306 z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);