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c906108c SS |
1 | /* Parameters for execution on a z8000 series machine. |
2 | Copyright 1992, 1993 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c | 20 | |
7355ddba | 21 | #define IEEE_FLOAT (1) |
c906108c SS |
22 | |
23 | #undef TARGET_INT_BIT | |
24 | #undef TARGET_LONG_BIT | |
25 | #undef TARGET_SHORT_BIT | |
26 | #undef TARGET_PTR_BIT | |
27 | ||
28 | #define TARGET_SHORT_BIT 16 | |
29 | #define TARGET_INT_BIT 16 | |
30 | #define TARGET_LONG_BIT 32 | |
31 | #define TARGET_PTR_BIT (BIG ? 32: 16) | |
32 | ||
33 | /* Define the bit, byte, and word ordering of the machine. */ | |
34 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
35 | ||
36 | /* Offset from address of function to start of its code. | |
37 | Zero on most machines. */ | |
38 | ||
39 | #define FUNCTION_START_OFFSET 0 | |
40 | ||
41 | /* Advance PC across any function entry prologue instructions | |
42 | to reach some "real" code. */ | |
43 | ||
b83266a0 | 44 | #define SKIP_PROLOGUE(ip) (z8k_skip_prologue (ip)) |
a14ed312 | 45 | extern CORE_ADDR z8k_skip_prologue (CORE_ADDR ip); |
c906108c SS |
46 | |
47 | ||
48 | /* Immediately after a function call, return the saved pc. | |
49 | Can't always go through the frames for this because on some machines | |
50 | the new frame is not set up until the new function executes | |
51 | some instructions. */ | |
52 | ||
d4f3574e SS |
53 | |
54 | extern int z8k_saved_pc_after_call (struct frame_info *frame); | |
55 | #define SAVED_PC_AFTER_CALL(frame) z8k_saved_pc_after_call(frame) | |
c906108c SS |
56 | |
57 | /* Stack grows downward. */ | |
58 | ||
59 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
60 | ||
61 | /* Sequence of bytes for breakpoint instruction. */ | |
62 | ||
63 | #define BREAKPOINT {0x36,0x00} | |
64 | ||
65 | /* If your kernel resets the pc after the trap happens you may need to | |
66 | define this before including this file. */ | |
67 | ||
68 | #define DECR_PC_AFTER_BREAK 0 | |
69 | ||
70 | /* Say how long registers are. */ | |
71 | ||
72 | #define REGISTER_TYPE unsigned int | |
73 | ||
c5aa993b JM |
74 | #define NUM_REGS 23 /* 16 registers + 1 ccr + 1 pc + 3 debug |
75 | regs + fake fp + fake sp */ | |
c906108c SS |
76 | #define REGISTER_BYTES (NUM_REGS *4) |
77 | ||
78 | /* Index within `registers' of the first byte of the space for | |
79 | register N. */ | |
80 | ||
81 | #define REGISTER_BYTE(N) ((N)*4) | |
82 | ||
83 | /* Number of bytes of storage in the actual machine representation | |
84 | for register N. On the z8k, all but the pc are 2 bytes, but we | |
85 | keep them all as 4 bytes and trim them on I/O */ | |
86 | ||
87 | ||
88 | #define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4) | |
89 | ||
90 | /* Number of bytes of storage in the program's representation | |
91 | for register N. */ | |
92 | ||
c5aa993b | 93 | #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N) |
c906108c SS |
94 | |
95 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
96 | ||
97 | #define MAX_REGISTER_RAW_SIZE 4 | |
98 | ||
99 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
100 | ||
101 | #define MAX_REGISTER_VIRTUAL_SIZE 4 | |
102 | ||
103 | /* Return the GDB type object for the "standard" data type | |
104 | of data in register N. */ | |
105 | ||
106 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
107 | (REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long) | |
108 | ||
c5aa993b | 109 | /*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y) */ |
c906108c SS |
110 | /* Initializer for an array of names of registers. |
111 | Entries beyond the first NUM_REGS are ignored. */ | |
112 | ||
113 | #define REGISTER_NAMES \ | |
114 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ | |
115 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \ | |
116 | "ccr", "pc", "cycles","insts","time","fp","sp"} | |
117 | ||
118 | /* Register numbers of various important registers. | |
119 | Note that some of these values are "real" register numbers, | |
120 | and correspond to the general registers of the machine, | |
121 | and some are "phony" register numbers which are too large | |
122 | to be actual register numbers as far as the user is concerned | |
123 | but do serve to get the desired values when passed to read_register. */ | |
124 | ||
125 | #define CCR_REGNUM 16 /* Contains processor status */ | |
126 | #define PC_REGNUM 17 /* Contains program counter */ | |
127 | #define CYCLES_REGNUM 18 | |
128 | #define INSTS_REGNUM 19 | |
129 | #define TIME_REGNUM 20 | |
130 | #define FP_REGNUM 21 /* Contains fp, whatever memory model */ | |
131 | #define SP_REGNUM 22 /* Conatins sp, whatever memory model */ | |
132 | ||
133 | ||
134 | ||
135 | #define PTR_SIZE (BIG ? 4: 2) | |
136 | #define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff) | |
137 | ||
138 | /* Store the address of the place in which to copy the structure the | |
139 | subroutine will return. This is called from call_function. */ | |
140 | ||
e1e9e218 | 141 | #define STORE_STRUCT_RETURN(ADDR, SP) internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
c906108c SS |
142 | |
143 | /* Extract from an array REGBUF containing the (raw) register state | |
144 | a function return value of type TYPE, and copy that, in virtual format, | |
145 | into VALBUF. This is assuming that floating point values are returned | |
146 | as doubles in d0/d1. */ | |
147 | ||
148 | ||
149 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
150 | memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE)); | |
151 | ||
152 | /* Write into appropriate registers a function return value | |
153 | of type TYPE, given in virtual format. */ | |
154 | ||
e1e9e218 | 155 | #define STORE_RETURN_VALUE(TYPE,VALBUF) internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
c906108c SS |
156 | |
157 | /* Extract from an array REGBUF containing the (raw) register state | |
158 | the address in which a function should return its structure value, | |
159 | as a CORE_ADDR (or an expression that can be used as one). */ | |
160 | ||
161 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) | |
162 | \f | |
163 | /* Describe the pointer in each stack frame to the previous stack frame | |
164 | (its caller). */ | |
165 | ||
166 | /* FRAME_CHAIN takes a frame's nominal address and produces the frame's | |
167 | chain-pointer. | |
168 | In the case of the Z8000, the frame's nominal address | |
169 | is the address of a ptr sized byte word containing the calling | |
170 | frame's address. */ | |
171 | ||
d4f3574e SS |
172 | extern CORE_ADDR z8k_frame_chain (struct frame_info *thisframe); |
173 | #define FRAME_CHAIN(thisframe) z8k_frame_chain(thisframe); | |
c906108c SS |
174 | |
175 | ||
176 | ||
177 | /* Define other aspects of the stack frame. */ | |
178 | ||
179 | /* A macro that tells us whether the function invocation represented | |
180 | by FI does not have a frame on the stack associated with it. If it | |
181 | does not, FRAMELESS is set to 1, else 0. */ | |
392a587b JM |
182 | #define FRAMELESS_FUNCTION_INVOCATION(FI) \ |
183 | (frameless_look_for_prologue (FI)) | |
c906108c | 184 | |
d4f3574e SS |
185 | extern CORE_ADDR z8k_frame_saved_pc (struct frame_info *frame); |
186 | #define FRAME_SAVED_PC(FRAME) z8k_frame_saved_pc(FRAME) | |
c906108c SS |
187 | |
188 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) | |
189 | ||
190 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
191 | ||
192 | /* Set VAL to the number of args passed to frame described by FI. | |
193 | Can set VAL to -1, meaning no way to tell. */ | |
194 | ||
195 | /* We can't tell how many args there are | |
196 | now that the C compiler delays popping them. */ | |
197 | #if !defined (FRAME_NUM_ARGS) | |
392a587b | 198 | #define FRAME_NUM_ARGS(fi) (-1) |
c906108c SS |
199 | #endif |
200 | ||
201 | /* Return number of bytes at start of arglist that are not really args. */ | |
202 | ||
203 | #define FRAME_ARGS_SKIP 8 | |
204 | ||
c906108c | 205 | struct frame_info; |
a14ed312 | 206 | extern void z8k_frame_init_saved_regs (struct frame_info *); |
c906108c | 207 | #define FRAME_INIT_SAVED_REGS(fi) z8k_frame_init_saved_regs (fi) |
c906108c | 208 | \f |
c5aa993b | 209 | |
c906108c SS |
210 | /* Things needed for making the inferior call functions. |
211 | It seems like every m68k based machine has almost identical definitions | |
212 | in the individual machine's configuration files. Most other cpu types | |
213 | (mips, i386, etc) have routines in their *-tdep.c files to handle this | |
214 | for most configurations. The m68k family should be able to do this as | |
215 | well. These macros can still be overridden when necessary. */ | |
216 | ||
217 | /* The CALL_DUMMY macro is the sequence of instructions, as disassembled | |
218 | by gdb itself: | |
219 | ||
c5aa993b JM |
220 | fmovemx fp0-fp7,sp@- 0xf227 0xe0ff |
221 | moveml d0-a5,sp@- 0x48e7 0xfffc | |
222 | clrw sp@- 0x4267 | |
223 | movew ccr,sp@- 0x42e7 | |
c906108c | 224 | |
c5aa993b JM |
225 | /..* The arguments are pushed at this point by GDB; |
226 | no code is needed in the dummy for this. | |
227 | The CALL_DUMMY_START_OFFSET gives the position of | |
228 | the following jsr instruction. *../ | |
c906108c | 229 | |
c5aa993b JM |
230 | jsr @#0x32323232 0x4eb9 0x3232 0x3232 |
231 | addal #0x69696969,sp 0xdffc 0x6969 0x6969 | |
232 | trap #<your BPT_VECTOR number here> 0x4e4? | |
233 | nop 0x4e71 | |
c906108c SS |
234 | |
235 | Note this is CALL_DUMMY_LENGTH bytes (28 for the above example). | |
236 | We actually start executing at the jsr, since the pushing of the | |
237 | registers is done by PUSH_DUMMY_FRAME. If this were real code, | |
238 | the arguments for the function called by the jsr would be pushed | |
239 | between the moveml and the jsr, and we could allow it to execute through. | |
240 | But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is | |
241 | done, and we cannot allow the moveml to push the registers again lest | |
242 | they be taken for the arguments. */ | |
243 | ||
244 | ||
245 | #define CALL_DUMMY { 0 } | |
c5aa993b JM |
246 | #define CALL_DUMMY_LENGTH 24 /* Size of CALL_DUMMY */ |
247 | #define CALL_DUMMY_START_OFFSET 8 /* Offset to jsr instruction */ | |
c906108c SS |
248 | |
249 | ||
250 | /* Insert the specified number of args and function address | |
251 | into a call sequence of the above form stored at DUMMYNAME. | |
252 | We use the BFD routines to store a big-endian value of known size. */ | |
253 | ||
254 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
255 | { bfd_putb32 (fun, (char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \ | |
256 | bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); } | |
257 | ||
258 | /* Push an empty stack frame, to record the current PC, etc. */ | |
259 | ||
260 | #define PUSH_DUMMY_FRAME { z8k_push_dummy_frame (); } | |
261 | ||
a14ed312 | 262 | extern void z8k_push_dummy_frame (void); |
c906108c | 263 | |
a14ed312 | 264 | extern void z8k_pop_frame (void); |
c906108c SS |
265 | |
266 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
267 | ||
268 | #define POP_FRAME { z8k_pop_frame (); } | |
269 | ||
270 | /* Offset from SP to first arg on stack at first instruction of a function */ | |
271 | ||
272 | #define SP_ARG0 (1 * 4) | |
273 | ||
a14ed312 | 274 | extern CORE_ADDR z8k_addr_bits_remove (CORE_ADDR); |
c906108c SS |
275 | #define ADDR_BITS_REMOVE(addr) z8k_addr_bits_remove (addr) |
276 | int sim_z8001_mode; | |
277 | #define BIG (sim_z8001_mode) | |
278 | ||
279 | #define read_memory_short(x) (read_memory_integer(x,2) & 0xffff) | |
280 | ||
281 | #define NO_STD_REGS | |
282 | ||
d4f3574e SS |
283 | extern void z8k_print_register_hook (int regno); |
284 | #define PRINT_REGISTER_HOOK(regno) z8k_print_register_hook(regno) | |
c906108c SS |
285 | |
286 | ||
d4f3574e | 287 | extern void z8k_set_pointer_size (int newsize); |
c906108c SS |
288 | #define INIT_EXTRA_SYMTAB_INFO \ |
289 | z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address); | |
290 | ||
291 | #define REGISTER_SIZE 4 |