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[deliverable/binutils-gdb.git] / gdb / config / ns32k / tm-merlin.h
1 /* Definitions to target GDB to a merlin under utek 2.1
2 Copyright 1986, 1987, 1989, 1991, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19
20 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
21
22 /* Offset from address of function to start of its code.
23 Zero on most machines. */
24
25 #define FUNCTION_START_OFFSET 0
26
27 /* Advance PC across any function entry prologue instructions
28 to reach some "real" code. */
29
30 #define SKIP_PROLOGUE(pc) \
31 { register int op = read_memory_integer (pc, 1); \
32 if (op == 0x82) \
33 { op = read_memory_integer (pc+2,1); \
34 if ((op & 0x80) == 0) pc += 3; \
35 else if ((op & 0xc0) == 0x80) pc += 4; \
36 else pc += 6; \
37 }}
38
39 /* Immediately after a function call, return the saved pc.
40 Can't always go through the frames for this because on some machines
41 the new frame is not set up until the new function executes
42 some instructions. */
43
44 #define SAVED_PC_AFTER_CALL(frame) \
45 read_memory_integer (read_register (SP_REGNUM), 4)
46
47 /* Address of end of stack space. */
48
49 #define STACK_END_ADDR (0x800000)
50
51 /* Stack grows downward. */
52
53 #define INNER_THAN <
54
55 /* Sequence of bytes for breakpoint instruction. */
56
57 #define BREAKPOINT {0xf2}
58
59 /* Amount PC must be decremented by after a breakpoint.
60 This is often the number of bytes in BREAKPOINT
61 but not always. */
62
63 #define DECR_PC_AFTER_BREAK 0
64
65 /* Nonzero if instruction at PC is a return instruction. */
66
67 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
68
69 /* Define this to say that the "svc" insn is followed by
70 codes in memory saying which kind of system call it is. */
71
72 #define NS32K_SVC_IMMED_OPERANDS
73
74 /* Say how long (ordinary) registers are. This is a piece of bogosity
75 used in push_word and a few other places; REGISTER_RAW_SIZE is the
76 real way to know how big a register is. */
77
78 #define REGISTER_SIZE 4
79
80 /* Number of machine registers */
81
82 #define NUM_REGS 25
83
84 #define NUM_GENERAL_REGS 8
85
86 /* Initializer for an array of names of registers.
87 There should be NUM_REGS strings in this initializer. */
88
89 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
90 "pc", "sp", "fp", "ps", \
91 "fsr", \
92 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
93 "l0", "l1", "l2", "l3", "l4", \
94 }
95
96 /* Register numbers of various important registers.
97 Note that some of these values are "real" register numbers,
98 and correspond to the general registers of the machine,
99 and some are "phony" register numbers which are too large
100 to be actual register numbers as far as the user is concerned
101 but do serve to get the desired values when passed to read_register. */
102
103 #define AP_REGNUM FP_REGNUM
104 #define FP_REGNUM 10 /* Contains address of executing stack frame */
105 #define SP_REGNUM 9 /* Contains address of top of stack */
106 #define PC_REGNUM 8 /* Contains program counter */
107 #define PS_REGNUM 11 /* Contains processor status */
108 #define FPS_REGNUM 12 /* Floating point status register */
109 #define FP0_REGNUM 13 /* Floating point register 0 */
110 #define LP0_REGNUM 21 /* Double register 0 (same as FP0) */
111
112 /* Total amount of space needed to store our copies of the machine's
113 register state, the array `registers'. */
114 #define REGISTER_BYTES ((NUM_REGS - 4) * sizeof (int) + 4 * sizeof (double))
115
116 /* Index within `registers' of the first byte of the space for
117 register N. */
118
119 #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
120 LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
121
122 /* Number of bytes of storage in the actual machine representation
123 for register N. On the 32000, all regs are 4 bytes
124 except for the doubled floating registers. */
125
126 #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
127
128 /* Number of bytes of storage in the program's representation
129 for register N. On the 32000, all regs are 4 bytes
130 except for the doubled floating registers. */
131
132 #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
133
134 /* Largest value REGISTER_RAW_SIZE can have. */
135
136 #define MAX_REGISTER_RAW_SIZE 8
137
138 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
139
140 #define MAX_REGISTER_VIRTUAL_SIZE 8
141
142 /* Return the GDB type object for the "standard" data type
143 of data in register N. */
144
145 #define REGISTER_VIRTUAL_TYPE(N) \
146 ((N) >= FP0_REGNUM ? \
147 ((N) >= LP0_REGNUM ? \
148 builtin_type_double \
149 : builtin_type_float) \
150 : builtin_type_int)
151
152 /* Store the address of the place in which to copy the structure the
153 subroutine will return. This is called from call_function.
154
155 On this machine this is a no-op, as gcc doesn't run on it yet.
156 This calling convention is not used. */
157
158 #define STORE_STRUCT_RETURN(ADDR, SP)
159
160 /* Extract from an array REGBUF containing the (raw) register state
161 a function return value of type TYPE, and copy that, in virtual format,
162 into VALBUF. */
163
164 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
165 memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
166
167 /* Write into appropriate registers a function return value
168 of type TYPE, given in virtual format. */
169
170 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
171 write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
172
173 /* Extract from an array REGBUF containing the (raw) register state
174 the address in which a function should return its structure value,
175 as a CORE_ADDR (or an expression that can be used as one). */
176
177 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
178 \f
179 /* Describe the pointer in each stack frame to the previous stack frame
180 (its caller). */
181
182 /* FRAME_CHAIN takes a frame's nominal address
183 and produces the frame's chain-pointer. */
184
185 /* In the case of the Merlin, the frame's nominal address is the FP value,
186 and at that address is saved previous FP value as a 4-byte word. */
187
188 #define FRAME_CHAIN(thisframe) \
189 (!inside_entry_file ((thisframe)->pc) ? \
190 read_memory_integer ((thisframe)->frame, 4) :\
191 0)
192
193 /* Define other aspects of the stack frame. */
194
195 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
196
197 /* compute base of arguments */
198 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
199
200 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
201
202 /* Return number of args passed to a frame.
203 Can return -1, meaning no way to tell. */
204
205 #define FRAME_NUM_ARGS(numargs, fi) \
206 { CORE_ADDR pc; \
207 int insn; \
208 int addr_mode; \
209 int width; \
210 \
211 pc = FRAME_SAVED_PC (fi); \
212 insn = read_memory_integer (pc,2); \
213 addr_mode = (insn >> 11) & 0x1f; \
214 insn = insn & 0x7ff; \
215 if ((insn & 0x7fc) == 0x57c \
216 && addr_mode == 0x14) /* immediate */ \
217 { if (insn == 0x57c) /* adjspb */ \
218 width = 1; \
219 else if (insn == 0x57d) /* adjspw */ \
220 width = 2; \
221 else if (insn == 0x57f) /* adjspd */ \
222 width = 4; \
223 numargs = read_memory_integer (pc+2,width); \
224 if (width > 1) \
225 flip_bytes (&numargs, width); \
226 numargs = - sign_extend (numargs, width*8) / 4; } \
227 else numargs = -1; \
228 }
229
230 /* Return number of bytes at start of arglist that are not really args. */
231
232 #define FRAME_ARGS_SKIP 8
233
234 /* Put here the code to store, into a struct frame_saved_regs,
235 the addresses of the saved registers of frame described by FRAME_INFO.
236 This includes special registers such as pc and fp saved in special
237 ways in the stack frame. sp is even more special:
238 the address we return for it IS the sp for the next frame. */
239
240 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
241 { int regmask,regnum; \
242 int localcount; \
243 CORE_ADDR enter_addr; \
244 CORE_ADDR next_addr; \
245 \
246 enter_addr = get_pc_function_start ((frame_info)->pc); \
247 regmask = read_memory_integer (enter_addr+1, 1); \
248 localcount = ns32k_localcount (enter_addr); \
249 next_addr = (frame_info)->frame + localcount; \
250 for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) \
251 (frame_saved_regs).regs[regnum] \
252 = (regmask & 1) ? (next_addr -= 4) : 0; \
253 (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4; \
254 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
255 (frame_saved_regs).regs[FP_REGNUM] \
256 = read_memory_integer ((frame_info)->frame, 4); }
257
258 \f
259 /* Things needed for making the inferior call functions. */
260
261 /* Push an empty stack frame, to record the current PC, etc. */
262
263 #define PUSH_DUMMY_FRAME \
264 { register CORE_ADDR sp = read_register (SP_REGNUM); \
265 register int regnum; \
266 sp = push_word (sp, read_register (PC_REGNUM)); \
267 sp = push_word (sp, read_register (FP_REGNUM)); \
268 write_register (FP_REGNUM, sp); \
269 for (regnum = 0; regnum < 8; regnum++) \
270 sp = push_word (sp, read_register (regnum)); \
271 write_register (SP_REGNUM, sp); \
272 }
273
274 /* Discard from the stack the innermost frame, restoring all registers. */
275
276 #define POP_FRAME \
277 { register struct frame_info *frame = get_current_frame (); \
278 register CORE_ADDR fp; \
279 register int regnum; \
280 struct frame_saved_regs fsr; \
281 struct frame_info *fi; \
282 fp = frame->frame; \
283 get_frame_saved_regs (frame, &fsr); \
284 for (regnum = 0; regnum < 8; regnum++) \
285 if (fsr.regs[regnum]) \
286 write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
287 write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
288 write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
289 write_register (SP_REGNUM, fp + 8); \
290 flush_cached_frames (); \
291 }
292
293 /* This sequence of words is the instructions
294 enter 0xff,0 82 ff 00
295 jsr @0x00010203 7f ae c0 01 02 03
296 adjspd 0x69696969 7f a5 01 02 03 04
297 bpt f2
298 Note this is 16 bytes. */
299
300 #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
301
302 #define CALL_DUMMY_START_OFFSET 3
303 #define CALL_DUMMY_LENGTH 16
304 #define CALL_DUMMY_ADDR 5
305 #define CALL_DUMMY_NARGS 11
306
307 /* Insert the specified number of args and function address
308 into a call sequence of the above form stored at DUMMYNAME. */
309
310 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
311 { int flipped = fun | 0xc0000000; \
312 flip_bytes (&flipped, 4); \
313 *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \
314 flipped = - nargs * 4; \
315 flip_bytes (&flipped, 4); \
316 *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \
317 }
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