1 /* Definitions to target GDB to a merlin under utek 2.1
2 Copyright (C) 1986, 1987, 1989, 1991 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 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
22 /* I don't know if this will work for cross-debugging, even if you do get
23 a copy of the right include file. */
24 #include <machine/reg.h>
26 /* Define this if the C compiler puts an underscore at the front
27 of external names before giving them to the linker. */
29 #define NAMES_HAVE_UNDERSCORE
31 /* Offset from address of function to start of its code.
32 Zero on most machines. */
34 #define FUNCTION_START_OFFSET 0
36 /* Advance PC across any function entry prologue instructions
37 to reach some "real" code. */
39 #define SKIP_PROLOGUE(pc) \
40 { register int op = read_memory_integer (pc, 1); \
42 { op = read_memory_integer (pc+2,1); \
43 if ((op & 0x80) == 0) pc += 3; \
44 else if ((op & 0xc0) == 0x80) pc += 4; \
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
53 #define SAVED_PC_AFTER_CALL(frame) \
54 read_memory_integer (read_register (SP_REGNUM), 4)
56 /* Address of end of stack space. */
58 #define STACK_END_ADDR (0x800000)
60 /* Stack grows downward. */
64 /* Sequence of bytes for breakpoint instruction. */
66 #define BREAKPOINT {0xf2}
68 /* Amount PC must be decremented by after a breakpoint.
69 This is often the number of bytes in BREAKPOINT
72 #define DECR_PC_AFTER_BREAK 0
74 /* Nonzero if instruction at PC is a return instruction. */
76 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
78 /* Return 1 if P points to an invalid floating point value. */
80 #define INVALID_FLOAT(p, len) 0
82 /* Define this to say that the "svc" insn is followed by
83 codes in memory saying which kind of system call it is. */
85 #define NS32K_SVC_IMMED_OPERANDS
87 /* Say how long (ordinary) registers are. */
89 #define REGISTER_TYPE long
91 /* Number of machine registers */
95 #define NUM_GENERAL_REGS 8
97 /* Initializer for an array of names of registers.
98 There should be NUM_REGS strings in this initializer. */
100 #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
101 "pc", "sp", "fp", "ps", \
103 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
104 "l0", "l1", "l2", "l3", "l4", \
107 /* Register numbers of various important registers.
108 Note that some of these values are "real" register numbers,
109 and correspond to the general registers of the machine,
110 and some are "phony" register numbers which are too large
111 to be actual register numbers as far as the user is concerned
112 but do serve to get the desired values when passed to read_register. */
114 #define AP_REGNUM FP_REGNUM
115 #define FP_REGNUM 10 /* Contains address of executing stack frame */
116 #define SP_REGNUM 9 /* Contains address of top of stack */
117 #define PC_REGNUM 8 /* Contains program counter */
118 #define PS_REGNUM 11 /* Contains processor status */
119 #define FPS_REGNUM 12 /* Floating point status register */
120 #define FP0_REGNUM 13 /* Floating point register 0 */
121 #define LP0_REGNUM 21 /* Double register 0 (same as FP0) */
123 /* Total amount of space needed to store our copies of the machine's
124 register state, the array `registers'. */
125 #define REGISTER_BYTES ((NUM_REGS - 4) * sizeof (int) + 4 * sizeof (double))
127 /* Index within `registers' of the first byte of the space for
130 #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
131 LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
133 /* Number of bytes of storage in the actual machine representation
134 for register N. On the 32000, all regs are 4 bytes
135 except for the doubled floating registers. */
137 #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
139 /* Number of bytes of storage in the program's representation
140 for register N. On the 32000, all regs are 4 bytes
141 except for the doubled floating registers. */
143 #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
145 /* Largest value REGISTER_RAW_SIZE can have. */
147 #define MAX_REGISTER_RAW_SIZE 8
149 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
151 #define MAX_REGISTER_VIRTUAL_SIZE 8
153 /* Nonzero if register N requires conversion
154 from raw format to virtual format. */
156 #define REGISTER_CONVERTIBLE(N) 0
158 /* Convert data from raw format for register REGNUM
159 to virtual format for register REGNUM. */
161 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
162 bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
164 /* Convert data from virtual format for register REGNUM
165 to raw format for register REGNUM. */
167 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
168 bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
170 /* Return the GDB type object for the "standard" data type
171 of data in register N. */
173 #define REGISTER_VIRTUAL_TYPE(N) \
174 ((N) >= FP0_REGNUM ? \
175 ((N) >= LP0_REGNUM ? \
176 builtin_type_double \
177 : builtin_type_float) \
180 /* Store the address of the place in which to copy the structure the
181 subroutine will return. This is called from call_function.
183 On this machine this is a no-op, as gcc doesn't run on it yet.
184 This calling convention is not used. */
186 #define STORE_STRUCT_RETURN(ADDR, SP)
188 /* Extract from an array REGBUF containing the (raw) register state
189 a function return value of type TYPE, and copy that, in virtual format,
192 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
193 bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
195 /* Write into appropriate registers a function return value
196 of type TYPE, given in virtual format. */
198 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
199 write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
201 /* Extract from an array REGBUF containing the (raw) register state
202 the address in which a function should return its structure value,
203 as a CORE_ADDR (or an expression that can be used as one). */
205 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
207 /* Describe the pointer in each stack frame to the previous stack frame
210 /* FRAME_CHAIN takes a frame's nominal address
211 and produces the frame's chain-pointer.
213 However, if FRAME_CHAIN_VALID returns zero,
214 it means the given frame is the outermost one and has no caller. */
216 /* In the case of the Merlin, the frame's nominal address is the FP value,
217 and at that address is saved previous FP value as a 4-byte word. */
219 #define FRAME_CHAIN(thisframe) \
220 (outside_startup_file ((thisframe)->pc) ? \
221 read_memory_integer ((thisframe)->frame, 4) :\
224 #define FRAME_CHAIN_VALID(chain, thisframe) \
225 (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
227 /* Define other aspects of the stack frame. */
229 #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
231 /* compute base of arguments */
232 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
234 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
236 /* Return number of args passed to a frame.
237 Can return -1, meaning no way to tell. */
239 #define FRAME_NUM_ARGS(numargs, fi) \
245 pc = FRAME_SAVED_PC (fi); \
246 insn = read_memory_integer (pc,2); \
247 addr_mode = (insn >> 11) & 0x1f; \
248 insn = insn & 0x7ff; \
249 if ((insn & 0x7fc) == 0x57c \
250 && addr_mode == 0x14) /* immediate */ \
251 { if (insn == 0x57c) /* adjspb */ \
253 else if (insn == 0x57d) /* adjspw */ \
255 else if (insn == 0x57f) /* adjspd */ \
257 numargs = read_memory_integer (pc+2,width); \
259 flip_bytes (&numargs, width); \
260 numargs = - sign_extend (numargs, width*8) / 4; } \
264 /* Return number of bytes at start of arglist that are not really args. */
266 #define FRAME_ARGS_SKIP 8
268 /* Put here the code to store, into a struct frame_saved_regs,
269 the addresses of the saved registers of frame described by FRAME_INFO.
270 This includes special registers such as pc and fp saved in special
271 ways in the stack frame. sp is even more special:
272 the address we return for it IS the sp for the next frame. */
274 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
275 { int regmask,regnum; \
277 CORE_ADDR enter_addr; \
278 CORE_ADDR next_addr; \
280 enter_addr = get_pc_function_start ((frame_info)->pc); \
281 regmask = read_memory_integer (enter_addr+1, 1); \
282 localcount = ns32k_localcount (enter_addr); \
283 next_addr = (frame_info)->frame + localcount; \
284 for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) \
285 (frame_saved_regs).regs[regnum] \
286 = (regmask & 1) ? (next_addr -= 4) : 0; \
287 (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4; \
288 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
289 (frame_saved_regs).regs[FP_REGNUM] \
290 = read_memory_integer ((frame_info)->frame, 4); }
293 /* Things needed for making the inferior call functions. */
295 /* Push an empty stack frame, to record the current PC, etc. */
297 #define PUSH_DUMMY_FRAME \
298 { register CORE_ADDR sp = read_register (SP_REGNUM); \
299 register int regnum; \
300 sp = push_word (sp, read_register (PC_REGNUM)); \
301 sp = push_word (sp, read_register (FP_REGNUM)); \
302 write_register (FP_REGNUM, sp); \
303 for (regnum = 0; regnum < 8; regnum++) \
304 sp = push_word (sp, read_register (regnum)); \
305 write_register (SP_REGNUM, sp); \
308 /* Discard from the stack the innermost frame, restoring all registers. */
311 { register FRAME frame = get_current_frame (); \
312 register CORE_ADDR fp; \
313 register int regnum; \
314 struct frame_saved_regs fsr; \
315 struct frame_info *fi; \
316 fi = get_frame_info (frame); \
318 get_frame_saved_regs (fi, &fsr); \
319 for (regnum = 0; regnum < 8; regnum++) \
320 if (fsr.regs[regnum]) \
321 write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
322 write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
323 write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
324 write_register (SP_REGNUM, fp + 8); \
325 flush_cached_frames (); \
326 set_current_frame (create_new_frame (read_register (FP_REGNUM),\
330 /* This sequence of words is the instructions
331 enter 0xff,0 82 ff 00
332 jsr @0x00010203 7f ae c0 01 02 03
333 adjspd 0x69696969 7f a5 01 02 03 04
335 Note this is 16 bytes. */
337 #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
339 #define CALL_DUMMY_START_OFFSET 3
340 #define CALL_DUMMY_LENGTH 16
341 #define CALL_DUMMY_ADDR 5
342 #define CALL_DUMMY_NARGS 11
344 /* Insert the specified number of args and function address
345 into a call sequence of the above form stored at DUMMYNAME. */
347 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
348 { int flipped = fun | 0xc0000000; \
349 flip_bytes (&flipped, 4); \
350 *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \
351 flipped = - nargs * 4; \
352 flip_bytes (&flipped, 4); \
353 *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \