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1.1 root 1: /* Definitions to make GDB run on an encore under umax 4.2
2: Copyright (C) 1987 Free Software Foundation, Inc.
3:
4: GDB is distributed in the hope that it will be useful, but WITHOUT ANY
5: WARRANTY. No author or distributor accepts responsibility to anyone
6: for the consequences of using it or for whether it serves any
7: particular purpose or works at all, unless he says so in writing.
8: Refer to the GDB General Public License for full details.
9:
10: Everyone is granted permission to copy, modify and redistribute GDB,
11: but only under the conditions described in the GDB General Public
12: License. A copy of this license is supposed to have been given to you
13: along with GDB so you can know your rights and responsibilities. It
14: should be in a file named COPYING. Among other things, the copyright
15: notice and this notice must be preserved on all copies.
16:
17: In other words, go ahead and share GDB, but don't try to stop
18: anyone else from sharing it farther. Help stamp out software hoarding!
19: */
20:
21: #ifndef ns16000
22: #define ns16000
23: #endif
24:
25: #define HAVE_WAIT_STRUCT
26:
27: /* Encore's modifications to ptrace format */
28:
29: #define UMAX_PTRACE
30:
31: /* Encore's modifications to core-file format */
32:
33: #define UMAX_CORE
34:
35: /* Do implement the attach and detach commands. */
36:
37: #define ATTACH_DETACH
38:
39: /* Define this if the C compiler puts an underscore at the front
40: of external names before giving them to the linker. */
41:
42: #define NAMES_HAVE_UNDERSCORE
43:
44: /* Exec files and symbol tables are in COFF format */
45:
46: #define COFF_FORMAT
47:
48: /* Offset from address of function to start of its code.
49: Zero on most machines. */
50:
51: #define FUNCTION_START_OFFSET 0
52:
53: /* Advance PC across any function entry prologue instructions
54: to reach some "real" code. */
55:
56: #define SKIP_PROLOGUE(pc) \
57: { register unsigned char op = read_memory_integer (pc, 1); \
58: if (op == 0x82) { op = read_memory_integer (pc+2,1); \
59: if ((op & 0x80) == 0) pc += 3; \
60: else if ((op & 0xc0) == 0x80) pc += 4; \
61: else pc += 6; \
62: } \
63: }
64:
65: /* Immediately after a function call, return the saved pc.
66: Can't always go through the frames for this because on some machines
67: the new frame is not set up until the new function executes
68: some instructions. */
69:
70: #define SAVED_PC_AFTER_CALL(frame) \
71: read_memory_integer (read_register (SP_REGNUM), 4)
72:
73: /* Address of end of stack space. */
74:
75: #define STACK_END_ADDR (0xfffff000)
76:
77: /* Stack grows downward. */
78:
79: #define INNER_THAN <
80:
81: /* Sequence of bytes for breakpoint instruction. */
82:
83: #define BREAKPOINT {0xf2}
84:
85: /* Amount PC must be decremented by after a breakpoint.
86: This is often the number of bytes in BREAKPOINT
87: but not always. */
88:
89: #define DECR_PC_AFTER_BREAK 0
90:
91: /* Nonzero if instruction at PC is a return instruction. */
92:
93: #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
94:
95: #ifndef NaN
96: #include <nan.h>
97: #endif NaN
98:
99: /* Return 1 if P points to an invalid floating point value. */
100:
101: #define INVALID_FLOAT(p, s) \
102: ((s == sizeof (float))? \
103: NaF (*(float *) p) : \
104: NaD (*(double *) p))
105:
106: /* Say how long (ordinary) registers are. */
107:
108: #define REGISTER_TYPE long
109:
110: /* Number of machine registers */
111:
112: #define NUM_REGS 25
113:
114: #define NUM_GENERAL_REGS 8
115:
116: /* Initializer for an array of names of registers.
117: There should be NUM_REGS strings in this initializer. */
118:
119: #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
120: "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
121: "sp", "fp", "pc", "ps", \
122: "fsr", \
123: "l0", "l1", "l2", "l3", "xx", \
124: }
125:
126: /* Register numbers of various important registers.
127: Note that some of these values are "real" register numbers,
128: and correspond to the general registers of the machine,
129: and some are "phony" register numbers which are too large
130: to be actual register numbers as far as the user is concerned
131: but do serve to get the desired values when passed to read_register. */
132:
133: #define FP0_REGNUM 8 /* Floating point register 0 */
134: #define SP_REGNUM 16 /* Contains address of top of stack */
135: #define AP_REGNUM FP_REGNUM
136: #define FP_REGNUM 17 /* Contains address of executing stack frame */
137: #define PC_REGNUM 18 /* Contains program counter */
138: #define PS_REGNUM 19 /* Contains processor status */
139: #define FPS_REGNUM 20 /* Floating point status register */
140: #define LP0_REGNUM 21 /* Double register 0 (same as FP0) */
141:
142: /* called from register_addr() -- blockend not used for now */
143: #define REGISTER_U_ADDR(addr, blockend, regno) \
144: { \
145: switch (regno) { \
146: case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: \
147: addr = PU_R0 - (regno * sizeof (int)); break; \
148: case SP_REGNUM: \
149: addr = PU_SP; break; \
150: case PC_REGNUM: \
151: addr = PU_PC; break; \
152: case FP_REGNUM: \
153: addr = PU_FP; break; \
154: case PS_REGNUM: \
155: addr = PU_PSL; break; \
156: case FPS_REGNUM: \
157: addr = PU_FSR; break; \
158: case FP0_REGNUM + 0: case FP0_REGNUM + 1: \
159: case FP0_REGNUM + 2: case FP0_REGNUM + 3: \
160: case FP0_REGNUM + 4: case FP0_REGNUM + 5: \
161: case FP0_REGNUM + 6: case FP0_REGNUM + 7: \
162: addr = PU_F0 + (regno - FP0_REGNUM) * sizeof (float); break; \
163: case LP0_REGNUM + 0: case LP0_REGNUM + 1: \
164: case LP0_REGNUM + 2: case LP0_REGNUM + 3: \
165: addr = PU_F0 + (regno - LP0_REGNUM) * sizeof (double); break; \
166: default: \
167: printf ("bad argument to REGISTER_U_ADDR %d\n", regno); \
168: abort (); \
169: } \
170: }
171:
172: /* Total amount of space needed to store our copies of the machine's
173: register state, the array `registers'. */
174: #define REGISTER_BYTES ((NUM_REGS - 4) * sizeof (int) + 4 * sizeof (double))
175:
176: /* Index within `registers' of the first byte of the space for
177: register N. */
178:
179: #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
180: LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
181:
182: /* Number of bytes of storage in the actual machine representation
183: for register N. On the 32000, all regs are 4 bytes
184: except for the doubled floating registers. */
185:
186: #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
187:
188: /* Number of bytes of storage in the program's representation
189: for register N. On the 32000, all regs are 4 bytes
190: except for the doubled floating registers. */
191:
192: #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
193:
194: /* Largest value REGISTER_RAW_SIZE can have. */
195:
196: #define MAX_REGISTER_RAW_SIZE 8
197:
198: /* Largest value REGISTER_VIRTUAL_SIZE can have. */
199:
200: #define MAX_REGISTER_VIRTUAL_SIZE 8
201:
202: /* Nonzero if register N requires conversion
203: from raw format to virtual format. */
204:
205: #define REGISTER_CONVERTIBLE(N) 0
206:
207: /* Convert data from raw format for register REGNUM
208: to virtual format for register REGNUM. */
209:
210: #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
211: bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
212:
213: /* Convert data from virtual format for register REGNUM
214: to raw format for register REGNUM. */
215:
216: #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
217: bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
218:
219: /* Return the GDB type object for the "standard" data type
220: of data in register N. */
221:
222: #define REGISTER_VIRTUAL_TYPE(N) \
223: (((N) < FP0_REGNUM) ? \
224: builtin_type_int : \
225: ((N) < FP0_REGNUM + 8) ? \
226: builtin_type_float : \
227: ((N) < LP0_REGNUM) ? \
228: builtin_type_int : \
229: builtin_type_double)
230:
231: /* Extract from an array REGBUF containing the (raw) register state
232: a function return value of type TYPE, and copy that, in virtual format,
233: into VALBUF. */
234:
235: #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
236: bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
237:
238: /* Write into appropriate registers a function return value
239: of type TYPE, given in virtual format. */
240:
241: #define STORE_RETURN_VALUE(TYPE,VALBUF) \
242: write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
243:
244: /* Extract from an array REGBUF containing the (raw) register state
245: the address in which a function should return its structure value,
246: as a CORE_ADDR (or an expression that can be used as one). */
247:
248: #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
249:
250: /* Describe the pointer in each stack frame to the previous stack frame
251: (its caller). */
252:
253: /* FRAME_CHAIN takes a frame's nominal address
254: and produces the frame's chain-pointer.
255:
256: FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
257: and produces the nominal address of the caller frame.
258:
259: However, if FRAME_CHAIN_VALID returns zero,
260: it means the given frame is the outermost one and has no caller.
261: In that case, FRAME_CHAIN_COMBINE is not used. */
262:
263: /* In the case of the ns32000 series, the frame's nominal address is the FP
264: value, and at that address is saved previous FP value as a 4-byte word. */
265:
266: #define FRAME_CHAIN(thisframe) (read_memory_integer (thisframe, 4))
267:
268: #define FRAME_CHAIN_VALID(chain, thisframe) \
269: (chain != 0 && (FRAME_SAVED_PC (thisframe) >= first_object_file_end))
270:
271: #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
272:
273: /* Define other aspects of the stack frame. */
274:
275: #define FRAME_SAVED_PC(frame) (read_memory_integer (frame + 4, 4))
276:
277: /* Compute base of arguments. */
278:
279: #define FRAME_ARGS_ADDRESS(fi) \
280: ((ns32k_get_enter_addr (fi.pc) > 1) ? \
281: ((fi).frame) : (read_register (SP_REGNUM) - 4))
282:
283: #define FRAME_LOCALS_ADDRESS(fi) ((fi).frame)
284:
285: /* Get the address of the enter opcode for this function, if it is active.
286: Returns positive address > 1 if pc is between enter/exit,
287: 1 if pc before enter or after exit, 0 otherwise. */
288:
289: #ifndef CORE_ADDR
290: #include "defs.h" /* Make sure CORE_ADDR is defined. */
291: #endif
292:
293: extern CORE_ADDR ns32k_get_enter_addr ();
294:
295: /* Return number of args passed to a frame.
296: Can return -1, meaning no way to tell.
297: Encore's C compiler often reuses same area on stack for args,
298: so this will often not work properly. If the arg names
299: are known, it's likely most of them will be printed. */
300:
301: #define FRAME_NUM_ARGS(numargs, fi) \
302: { CORE_ADDR pc; \
303: CORE_ADDR enter_addr; \
304: unsigned int insn; \
305: unsigned int addr_mode; \
306: int width; \
307: \
308: numargs = -1; \
309: enter_addr = ns32k_get_enter_addr (fi.pc); \
310: if (enter_addr > 0) \
311: { \
312: pc = (enter_addr == 1) ? \
313: SAVED_PC_AFTER_CALL () : \
314: FRAME_SAVED_PC (fi.frame); \
315: insn = read_memory_integer (pc,2); \
316: addr_mode = (insn >> 11) & 0x1f; \
317: insn = insn & 0x7ff; \
318: if ((insn & 0x7fc) == 0x57c && \
319: addr_mode == 0x14) /* immediate */ \
320: { \
321: if (insn == 0x57c) /* adjspb */ \
322: width = 1; \
323: else if (insn == 0x57d) /* adjspw */ \
324: width = 2; \
325: else if (insn == 0x57f) /* adjspd */ \
326: width = 4; \
327: numargs = read_memory_integer (pc+2,width); \
328: if (width > 1) \
329: flip_bytes (&numargs, width); \
330: numargs = - sign_extend (numargs, width*8) / 4;\
331: } \
332: } \
333: }
334:
335: /* Return number of bytes at start of arglist that are not really args. */
336:
337: #define FRAME_ARGS_SKIP 8
338:
339: /* Put here the code to store, into a struct frame_saved_regs,
340: the addresses of the saved registers of frame described by FRAME_INFO.
341: This includes special registers such as pc and fp saved in special
342: ways in the stack frame. sp is even more special:
343: the address we return for it IS the sp for the next frame. */
344:
345: #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
346: { \
347: register int regmask, regnum; \
348: int localcount; \
349: register CORE_ADDR enter_addr; \
350: register CORE_ADDR next_addr; \
351: \
352: bzero (&(frame_saved_regs), sizeof (frame_saved_regs)); \
353: enter_addr = ns32k_get_enter_addr ((frame_info).pc); \
354: if (enter_addr > 1) \
355: { \
356: regmask = read_memory_integer (enter_addr+1, 1) & 0xff; \
357: localcount = ns32k_localcount (enter_addr); \
358: next_addr = (frame_info).frame + localcount; \
359: for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) \
360: (frame_saved_regs).regs[regnum] = (regmask & 1) ? \
361: (next_addr -= 4) : 0; \
362: (frame_saved_regs).regs[SP_REGNUM] = (frame_info).frame + 4;\
363: (frame_saved_regs).regs[PC_REGNUM] = (frame_info).frame + 4;\
364: (frame_saved_regs).regs[FP_REGNUM] = \
365: (read_memory_integer ((frame_info).frame, 4));\
366: } \
367: else if (enter_addr == 1) \
368: { \
369: CORE_ADDR sp = read_register (SP_REGNUM); \
370: (frame_saved_regs).regs[PC_REGNUM] = sp; \
371: (frame_saved_regs).regs[SP_REGNUM] = sp + 4; \
372: } \
373: }
374:
375: /* Compensate for lack of `vprintf' function. */
376: #define vprintf(format, ap) _doprnt (format, ap, stdout)
377:
378: /* Things needed for making the inferior call functions. */
379:
380: /* Push an empty stack frame, to record the current PC, etc. */
381:
382: #define PUSH_DUMMY_FRAME \
383: { register CORE_ADDR sp = read_register (SP_REGNUM);\
384: register int regnum; \
385: sp = push_word (sp, read_register (PC_REGNUM)); \
386: sp = push_word (sp, read_register (FP_REGNUM)); \
387: write_register (FP_REGNUM, sp); \
388: for (regnum = 0; regnum < 8; regnum++) \
389: sp = push_word (sp, read_register (regnum)); \
390: write_register (SP_REGNUM, sp); \
391: }
392:
393: /* Discard from the stack the innermost frame, restoring all registers. */
394:
395: #define POP_FRAME \
396: { register CORE_ADDR fp = read_register (FP_REGNUM); \
397: register int regnum; \
398: struct frame_saved_regs fsr; \
399: struct frame_info fi; \
400: fi = get_frame_info (fp); \
401: get_frame_saved_regs (&fi, &fsr); \
402: for (regnum = 0; regnum < 8; regnum++) \
403: if (fsr.regs[regnum]) \
404: write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
405: write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
406: write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
407: write_register (SP_REGNUM, fp + 8); \
408: }
409:
410: /* This sequence of words is the instructions
411: enter 0xff,0 82 ff 00
412: jsr @0x00010203 7f ae c0 01 02 03
413: adjspd 0x69696969 7f a5 01 02 03 04
414: bpt f2
415: Note this is 16 bytes. */
416:
417: #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
418:
419: #define CALL_DUMMY_START_OFFSET 3
420: #define CALL_DUMMY_LENGTH 16
421: #define CALL_DUMMY_ADDR 5
422: #define CALL_DUMMY_NARGS 11
423:
424: /* Insert the specified number of args and function address
425: into a call sequence of the above form stored at DUMMYNAME. */
426:
427: #define FIX_CALL_DUMMY(dummyname, fun, nargs) \
428: { \
429: int flipped; \
430: flipped = fun | 0xc0000000; \
431: flip_bytes (&flipped, 4); \
432: *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \
433: flipped = - nargs * 4; \
434: flip_bytes (&flipped, 4); \
435: *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \
436: }
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