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1 | /* Parameters for execution on a z8000 series machine. |
2 | Copyright 1992, 1993 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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. */ | |
19 | ||
20 | #define IEEE_FLOAT 1 | |
21 | ||
22 | #undef TARGET_INT_BIT | |
23 | #undef TARGET_LONG_BIT | |
24 | #undef TARGET_SHORT_BIT | |
25 | #undef TARGET_PTR_BIT | |
26 | ||
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) | |
31 | ||
32 | /* Define the bit, byte, and word ordering of the machine. */ | |
33 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
34 | ||
35 | /* Offset from address of function to start of its code. | |
36 | Zero on most machines. */ | |
37 | ||
38 | #define FUNCTION_START_OFFSET 0 | |
39 | ||
40 | /* Advance PC across any function entry prologue instructions | |
41 | to reach some "real" code. */ | |
42 | ||
43 | #define SKIP_PROLOGUE(ip) {(ip) = z8k_skip_prologue(ip);} | |
44 | extern CORE_ADDR mz8k_skip_prologue PARAMS ((CORE_ADDR ip)); | |
45 | ||
46 | ||
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 | |
50 | some instructions. */ | |
51 | ||
52 | #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call(frame) | |
53 | ||
54 | /* Stack grows downward. */ | |
55 | ||
56 | #define INNER_THAN < | |
57 | ||
58 | /* Sequence of bytes for breakpoint instruction. */ | |
59 | ||
60 | #define BREAKPOINT {0x36,0x00} | |
61 | ||
62 | /* If your kernel resets the pc after the trap happens you may need to | |
63 | define this before including this file. */ | |
64 | ||
65 | #define DECR_PC_AFTER_BREAK 0 | |
66 | ||
67 | /* Nonzero if instruction at PC is a return instruction. */ | |
68 | /* Allow any of the return instructions, including a trapv and a return | |
69 | from interupt. */ | |
70 | ||
71 | #define ABOUT_TO_RETURN(pc) about_to_return(pc) | |
72 | ||
73 | /* Return 1 if P points to an invalid floating point value. */ | |
74 | ||
75 | #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */ | |
76 | ||
77 | /* Say how long registers are. */ | |
78 | ||
79 | #define REGISTER_TYPE unsigned int | |
80 | ||
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) | |
84 | ||
85 | /* Index within `registers' of the first byte of the space for | |
86 | register N. */ | |
87 | ||
88 | #define REGISTER_BYTE(N) ((N)*4) | |
89 | ||
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 */ | |
93 | ||
94 | ||
95 | #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4) | |
96 | ||
97 | /* Number of bytes of storage in the program's representation | |
98 | for register N. */ | |
99 | ||
100 | #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N) | |
101 | ||
102 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
103 | ||
104 | #define MAX_REGISTER_RAW_SIZE 4 | |
105 | ||
106 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
107 | ||
108 | #define MAX_REGISTER_VIRTUAL_SIZE 4 | |
109 | ||
110 | /* Nonzero if register N requires conversion | |
111 | from raw format to virtual format. */ | |
112 | ||
113 | #define REGISTER_CONVERTIBLE(N) 0 | |
114 | ||
115 | /* Convert data from raw format for register REGNUM | |
116 | to virtual format for register REGNUM. */ | |
117 | ||
118 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ | |
119 | register_convert_to_virtual(REGNUM, FROM, TO) | |
120 | ||
121 | /* Convert data from virtual format for register REGNUM | |
122 | to raw format for register REGNUM. */ | |
123 | ||
124 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ | |
125 | register_convert_to_raw(REGNUM, FROM, TO) | |
126 | ||
127 | /* Return the GDB type object for the "standard" data type | |
128 | of data in register N. */ | |
129 | ||
130 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
131 | (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long) | |
132 | ||
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. */ | |
136 | ||
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"} | |
141 | ||
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. */ | |
148 | ||
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 */ | |
156 | ||
157 | ||
158 | ||
159 | #define PTR_SIZE (BIG ? 4: 2) | |
160 | #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff) | |
161 | ||
162 | /* Store the address of the place in which to copy the structure the | |
163 | subroutine will return. This is called from call_function. */ | |
164 | ||
165 | #define STORE_STRUCT_RETURN(ADDR, SP) abort(); | |
166 | ||
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. */ | |
171 | ||
172 | ||
173 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
ade40d31 | 174 | memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE)); |
5076de82 FF |
175 | |
176 | /* Write into appropriate registers a function return value | |
177 | of type TYPE, given in virtual format. */ | |
178 | ||
179 | #define STORE_RETURN_VALUE(TYPE,VALBUF) abort(); | |
180 | ||
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). */ | |
184 | ||
185 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) | |
186 | \f | |
187 | /* Describe the pointer in each stack frame to the previous stack frame | |
188 | (its caller). */ | |
189 | ||
190 | /* FRAME_CHAIN takes a frame's nominal address and produces the frame's | |
191 | chain-pointer. | |
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 | |
194 | frame's address. */ | |
195 | ||
196 | #define FRAME_CHAIN(thisframe) frame_chain(thisframe); | |
197 | ||
198 | ||
199 | ||
200 | /* Define other aspects of the stack frame. */ | |
201 | ||
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) | |
207 | ||
208 | #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME) | |
209 | ||
210 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) | |
211 | ||
212 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
213 | ||
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. */ | |
216 | ||
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) | |
221 | #endif | |
222 | ||
223 | /* Return number of bytes at start of arglist that are not really args. */ | |
224 | ||
225 | #define FRAME_ARGS_SKIP 8 | |
226 | ||
227 | ||
228 | \f | |
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. */ | |
235 | ||
236 | /* The CALL_DUMMY macro is the sequence of instructions, as disassembled | |
237 | by gdb itself: | |
238 | ||
239 | fmovemx fp0-fp7,sp@- 0xf227 0xe0ff | |
240 | moveml d0-a5,sp@- 0x48e7 0xfffc | |
241 | clrw sp@- 0x4267 | |
242 | movew ccr,sp@- 0x42e7 | |
243 | ||
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. *../ | |
248 | ||
249 | jsr @#0x32323232 0x4eb9 0x3232 0x3232 | |
250 | addal #0x69696969,sp 0xdffc 0x6969 0x6969 | |
251 | trap #<your BPT_VECTOR number here> 0x4e4? | |
252 | nop 0x4e71 | |
253 | ||
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. */ | |
262 | ||
263 | ||
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*/ | |
267 | ||
268 | ||
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. */ | |
272 | ||
273 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
4a87a64a ILT |
274 | { bfd_putb32 (fun, (char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \ |
275 | bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); } | |
5076de82 FF |
276 | |
277 | /* Push an empty stack frame, to record the current PC, etc. */ | |
278 | ||
279 | #define PUSH_DUMMY_FRAME { z8k_push_dummy_frame (); } | |
280 | ||
281 | extern void z8k_push_dummy_frame PARAMS ((void)); | |
282 | ||
283 | extern void z8k_pop_frame PARAMS ((void)); | |
284 | ||
285 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
286 | ||
287 | #define POP_FRAME { z8k_pop_frame (); } | |
288 | ||
289 | /* Offset from SP to first arg on stack at first instruction of a function */ | |
290 | ||
291 | #define SP_ARG0 (1 * 4) | |
292 | ||
293 | #define ADDR_BITS_REMOVE(x) addr_bits_remove(x) | |
294 | #define ADDR_BITS_SET(x) addr_bits_set(x) | |
295 | int z8001_mode; | |
296 | #define BIG (z8001_mode) | |
297 | ||
298 | #define read_memory_short(x) (read_memory_integer(x,2) & 0xffff) | |
299 | ||
300 | #define NO_STD_REGS | |
301 | ||
302 | #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno) | |
303 | ||
304 | ||
305 | #define INIT_EXTRA_SYMTAB_INFO \ | |
306 | z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address); |