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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [config/] [a29k/] [tm-a29k.h] - Blame information for rev 1765

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1 106 markom
/* Parameters for target machine AMD 29000, for GDB, the GNU debugger.
2
   Copyright 1990, 1991, 1993, 1994 Free Software Foundation, Inc.
3
   Contributed by Cygnus Support.  Written by Jim Kingdon.
4
 
5
   This file is part of GDB.
6
 
7
   This program is free software; you can redistribute it and/or modify
8
   it under the terms of the GNU General Public License as published by
9
   the Free Software Foundation; either version 2 of the License, or
10
   (at your option) any later version.
11
 
12
   This program is distributed in the hope that it will be useful,
13
   but WITHOUT ANY WARRANTY; without even the implied warranty of
14
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
   GNU General Public License for more details.
16
 
17
   You should have received a copy of the GNU General Public License
18
   along with this program; if not, write to the Free Software
19
   Foundation, Inc., 59 Temple Place - Suite 330,
20
   Boston, MA 02111-1307, USA.  */
21
 
22
/* Parameters for an EB29K (a board which plugs into a PC and is
23
   accessed through EBMON software running on the PC, which we
24
   use as we'd use a remote stub (see remote-eb.c).
25
 
26
   If gdb is ported to other a29k machines/systems, the
27
   machine/system-specific parts should be removed from this file (a
28
   la tm-m68k.h).  */
29
 
30
/* Byte order is configurable, but this machine runs big-endian.  */
31
#define TARGET_BYTE_ORDER BIG_ENDIAN
32
 
33
/* Floating point uses IEEE representations.  */
34
#define IEEE_FLOAT
35
 
36
/* Recognize our magic number.  */
37
#define BADMAG(x) ((x).f_magic != 0572)
38
 
39
/* Offset from address of function to start of its code.
40
   Zero on most machines.  */
41
 
42
#define FUNCTION_START_OFFSET 0
43
 
44
/* Advance PC across any function entry prologue instructions
45
   to reach some "real" code.  */
46
 
47
#define SKIP_PROLOGUE(pc) (a29k_skip_prologue (pc))
48
CORE_ADDR a29k_skip_prologue ();
49
 
50
/* Immediately after a function call, return the saved pc.
51
   Can't go through the frames for this because on some machines
52
   the new frame is not set up until the new function executes
53
   some instructions.  */
54
 
55
#define SAVED_PC_AFTER_CALL(frame) ((frame->flags & TRANSPARENT_FRAME) \
56
                                    ? read_register (TPC_REGNUM) \
57
                                    : read_register (LR0_REGNUM))
58
 
59
/* Stack grows downward.  */
60
 
61
#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
62
 
63
/* Stack must be aligned on 32-bit boundaries when synthesizing
64
   function calls. */
65
 
66
#define STACK_ALIGN(ADDR) (((ADDR) + 3) & ~3)
67
 
68
/* Sequence of bytes for breakpoint instruction.  */
69
/* ASNEQ 0x50, gr1, gr1
70
   The trap number 0x50 is chosen arbitrarily.
71
   We let the command line (or previously included files) override this
72
   setting.  */
73
#ifndef BREAKPOINT
74
#if TARGET_BYTE_ORDER == BIG_ENDIAN
75
#define BREAKPOINT {0x72, 0x50, 0x01, 0x01}
76
#else /* Target is little-endian.  */
77
#define BREAKPOINT {0x01, 0x01, 0x50, 0x72}
78
#endif /* Target is little-endian.  */
79
#endif /* BREAKPOINT */
80
 
81
/* Amount PC must be decremented by after a breakpoint.
82
   This is often the number of bytes in BREAKPOINT
83
   but not always.  */
84
 
85
#define DECR_PC_AFTER_BREAK 0
86
 
87
/* Say how long (ordinary) registers are.  This is a piece of bogosity
88
   used in push_word and a few other places; REGISTER_RAW_SIZE is the
89
   real way to know how big a register is.  */
90
 
91
#define REGISTER_SIZE 4
92
 
93
/* Allow the register declarations here to be overridden for remote
94
   kernel debugging.  */
95
#if !defined (REGISTER_NAMES)
96
 
97
/* Number of machine registers */
98
 
99
#define NUM_REGS 205
100
 
101
/* Initializer for an array of names of registers.
102
   There should be NUM_REGS strings in this initializer.
103
 
104
   FIXME, add floating point registers and support here.
105
 
106
   Also note that this list does not attempt to deal with kernel
107
   debugging (in which the first 32 registers are gr64-gr95).  */
108
 
109
#define REGISTER_NAMES \
110
{"gr96", "gr97", "gr98", "gr99", "gr100", "gr101", "gr102", "gr103", "gr104", \
111
 "gr105", "gr106", "gr107", "gr108", "gr109", "gr110", "gr111", "gr112", \
112
 "gr113", "gr114", "gr115", "gr116", "gr117", "gr118", "gr119", "gr120", \
113
 "gr121", "gr122", "gr123", "gr124", "gr125", "gr126", "gr127",          \
114
 "lr0", "lr1", "lr2", "lr3", "lr4", "lr5", "lr6", "lr7", "lr8", "lr9",   \
115
 "lr10", "lr11", "lr12", "lr13", "lr14", "lr15", "lr16", "lr17", "lr18", \
116
 "lr19", "lr20", "lr21", "lr22", "lr23", "lr24", "lr25", "lr26", "lr27", \
117
 "lr28", "lr29", "lr30", "lr31", "lr32", "lr33", "lr34", "lr35", "lr36", \
118
 "lr37", "lr38", "lr39", "lr40", "lr41", "lr42", "lr43", "lr44", "lr45", \
119
 "lr46", "lr47", "lr48", "lr49", "lr50", "lr51", "lr52", "lr53", "lr54", \
120
 "lr55", "lr56", "lr57", "lr58", "lr59", "lr60", "lr61", "lr62", "lr63", \
121
 "lr64", "lr65", "lr66", "lr67", "lr68", "lr69", "lr70", "lr71", "lr72", \
122
 "lr73", "lr74", "lr75", "lr76", "lr77", "lr78", "lr79", "lr80", "lr81", \
123
 "lr82", "lr83", "lr84", "lr85", "lr86", "lr87", "lr88", "lr89", "lr90", \
124
 "lr91", "lr92", "lr93", "lr94", "lr95", "lr96", "lr97", "lr98", "lr99", \
125
 "lr100", "lr101", "lr102", "lr103", "lr104", "lr105", "lr106", "lr107", \
126
 "lr108", "lr109", "lr110", "lr111", "lr112", "lr113", "lr114", "lr115", \
127
 "lr116", "lr117", "lr118", "lr119", "lr120", "lr121", "lr122", "lr123", \
128
 "lr124", "lr125", "lr126", "lr127",                                     \
129
  "AI0", "AI1", "AI2", "AI3", "AI4", "AI5", "AI6", "AI7", "AI8", "AI9",  \
130
  "AI10", "AI11", "AI12", "AI13", "AI14", "AI15", "FP",                  \
131
  "bp", "fc", "cr", "q",                                                 \
132
  "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr",  \
133
  "pc0", "pc1", "pc2", "mmu", "lru", "fpe", "inte", "fps", "exo", "gr1",  \
134
  "alu", "ipc", "ipa", "ipb" }
135
 
136
/*
137
 * Converts an sdb register number to an internal gdb register number.
138
 * Currently under epi, gr96->0...gr127->31...lr0->32...lr127->159, or...
139
 *                      gr64->0...gr95->31, lr0->32...lr127->159.
140
 */
141
#define SDB_REG_TO_REGNUM(value) \
142
  (((value) >= 96 && (value) <= 127) ? ((value) - 96) : \
143
   ((value) >= 128 && (value) <=  255) ? ((value) - 128 + LR0_REGNUM) : \
144
   (value))
145
 
146
/*
147
 * Provide the processor register numbers of some registers that are
148
 * expected/written in instructions that might change under different
149
 * register sets.  Namely, gcc can compile (-mkernel-registers) so that
150
 * it uses gr64-gr95 in stead of gr96-gr127.
151
 */
152
#define MSP_HW_REGNUM   125     /* gr125 */
153
#define RAB_HW_REGNUM   126     /* gr126 */
154
 
155
/* Convert Processor Special register #x to REGISTER_NAMES register # */
156
#define SR_REGNUM(x) \
157
  ((x) < 15  ? VAB_REGNUM + (x)                                  \
158
   : (x) >= 128 && (x) < 131 ? IPC_REGNUM + (x) - 128            \
159
   : (x) == 131 ? Q_REGNUM                                       \
160
   : (x) == 132 ? ALU_REGNUM                                     \
161
   : (x) >= 133 && (x) < 136 ? BP_REGNUM + (x) - 133             \
162
   : (x) >= 160 && (x) < 163 ? FPE_REGNUM + (x) - 160            \
163
   : (x) == 164 ? EXO_REGNUM                                     \
164
   : (error ("Internal error in SR_REGNUM"), 0))
165
#define GR96_REGNUM 0
166
 
167
/* Define the return register separately, so it can be overridden for
168
   kernel procedure calling conventions. */
169
#define RETURN_REGNUM   GR96_REGNUM
170
#define GR1_REGNUM 200
171
/* This needs to be the memory stack pointer, not the register stack pointer,
172
   to make call_function work right.  */
173
#define SP_REGNUM MSP_REGNUM
174
#define FP_REGNUM 33            /* lr1 */
175
 
176
/* Return register for transparent calling convention (gr122).  */
177
#define TPC_REGNUM (122 - 96 + GR96_REGNUM)
178
 
179
/* Large Return Pointer (gr123).  */
180
#define LRP_REGNUM (123 - 96 + GR96_REGNUM)
181
 
182
/* Static link pointer (gr124).  */
183
#define SLP_REGNUM (124 - 96 + GR96_REGNUM)
184
 
185
/* Memory Stack Pointer (gr125).  */
186
#define MSP_REGNUM (125 - 96 + GR96_REGNUM)
187
 
188
/* Register allocate bound (gr126).  */
189
#define RAB_REGNUM (126 - 96 + GR96_REGNUM)
190
 
191
/* Register Free Bound (gr127).  */
192
#define RFB_REGNUM (127 - 96 + GR96_REGNUM)
193
 
194
/* Register Stack Pointer.  */
195
#define RSP_REGNUM GR1_REGNUM
196
#define LR0_REGNUM 32
197
#define BP_REGNUM 177
198
#define FC_REGNUM 178
199
#define CR_REGNUM 179
200
#define Q_REGNUM 180
201
#define VAB_REGNUM 181
202
#define OPS_REGNUM (VAB_REGNUM + 1)
203
#define CPS_REGNUM (VAB_REGNUM + 2)
204
#define CFG_REGNUM (VAB_REGNUM + 3)
205
#define CHA_REGNUM (VAB_REGNUM + 4)
206
#define CHD_REGNUM (VAB_REGNUM + 5)
207
#define CHC_REGNUM (VAB_REGNUM + 6)
208
#define RBP_REGNUM (VAB_REGNUM + 7)
209
#define TMC_REGNUM (VAB_REGNUM + 8)
210
#define TMR_REGNUM (VAB_REGNUM + 9)
211
#define NPC_REGNUM (VAB_REGNUM + 10)    /* pc0 */
212
#define PC_REGNUM  (VAB_REGNUM + 11)    /* pc1 */
213
#define PC2_REGNUM (VAB_REGNUM + 12)
214
#define MMU_REGNUM (VAB_REGNUM + 13)
215
#define LRU_REGNUM (VAB_REGNUM + 14)
216
#define FPE_REGNUM (VAB_REGNUM + 15)
217
#define INTE_REGNUM (VAB_REGNUM + 16)
218
#define FPS_REGNUM (VAB_REGNUM + 17)
219
#define EXO_REGNUM (VAB_REGNUM + 18)
220
/* gr1 is defined above as 200 = VAB_REGNUM + 19 */
221
#define ALU_REGNUM (VAB_REGNUM + 20)
222
#define PS_REGNUM  ALU_REGNUM
223
#define IPC_REGNUM (VAB_REGNUM + 21)
224
#define IPA_REGNUM (VAB_REGNUM + 22)
225
#define IPB_REGNUM (VAB_REGNUM + 23)
226
 
227
#endif /* !defined(REGISTER_NAMES) */
228
 
229
/* Total amount of space needed to store our copies of the machine's
230
   register state, the array `registers'.  */
231
#define REGISTER_BYTES (NUM_REGS * 4)
232
 
233
/* Index within `registers' of the first byte of the space for
234
   register N.  */
235
#define REGISTER_BYTE(N)  ((N)*4)
236
 
237
/* Number of bytes of storage in the actual machine representation
238
   for register N.  */
239
 
240
/* All regs are 4 bytes.  */
241
 
242
#define REGISTER_RAW_SIZE(N) (4)
243
 
244
/* Number of bytes of storage in the program's representation
245
   for register N.  */
246
 
247
/* All regs are 4 bytes.  */
248
 
249
#define REGISTER_VIRTUAL_SIZE(N) (4)
250
 
251
/* Largest value REGISTER_RAW_SIZE can have.  */
252
 
253
#define MAX_REGISTER_RAW_SIZE (4)
254
 
255
/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
256
 
257
#define MAX_REGISTER_VIRTUAL_SIZE (4)
258
 
259
/* Return the GDB type object for the "standard" data type
260
   of data in register N.  */
261
 
262
#define REGISTER_VIRTUAL_TYPE(N) \
263
  (((N) == PC_REGNUM || (N) == LRP_REGNUM || (N) == SLP_REGNUM         \
264
    || (N) == MSP_REGNUM || (N) == RAB_REGNUM || (N) == RFB_REGNUM     \
265
    || (N) == GR1_REGNUM || (N) == FP_REGNUM || (N) == LR0_REGNUM       \
266
    || (N) == NPC_REGNUM || (N) == PC2_REGNUM)                           \
267
   ? lookup_pointer_type (builtin_type_void) : builtin_type_int)
268
 
269
/* Store the address of the place in which to copy the structure the
270
   subroutine will return.  This is called from call_function. */
271
/* On the a29k the LRP points to the part of the structure beyond the first
272
   16 words.  */
273
#define STORE_STRUCT_RETURN(ADDR, SP) \
274
  write_register (LRP_REGNUM, (ADDR) + 16 * 4);
275
 
276
/* Should call_function allocate stack space for a struct return?  */
277
/* On the a29k objects over 16 words require the caller to allocate space.  */
278
extern use_struct_convention_fn a29k_use_struct_convention;
279
#define USE_STRUCT_CONVENTION(gcc_p, type) a29k_use_struct_convention (gcc_p, type)
280
 
281
/* Extract from an array REGBUF containing the (raw) register state
282
   a function return value of type TYPE, and copy that, in virtual format,
283
   into VALBUF.  */
284
 
285
#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF)              \
286
  {                                                                        \
287
    int reg_length = TYPE_LENGTH (TYPE);                                   \
288
    if (reg_length > 16 * 4)                                               \
289
      {                                                                    \
290
        reg_length = 16 * 4;                                               \
291
        read_memory (*((int *)(REGBUF) + LRP_REGNUM), (VALBUF) + 16 * 4,   \
292
                     TYPE_LENGTH (TYPE) - 16 * 4);                         \
293
      }                                                                    \
294
    memcpy ((VALBUF), ((int *)(REGBUF))+RETURN_REGNUM, reg_length);        \
295
  }
296
 
297
/* Write into appropriate registers a function return value
298
   of type TYPE, given in virtual format.  */
299
 
300
#define STORE_RETURN_VALUE(TYPE,VALBUF) \
301
  {                                                                       \
302
    int reg_length = TYPE_LENGTH (TYPE);                                  \
303
    if (reg_length > 16 * 4)                                              \
304
      {                                                                   \
305
        reg_length = 16 * 4;                                              \
306
        write_memory (read_register (LRP_REGNUM),                         \
307
                      (char *)(VALBUF) + 16 * 4,                          \
308
                      TYPE_LENGTH (TYPE) - 16 * 4);                       \
309
      }                                                                   \
310
    write_register_bytes (REGISTER_BYTE (RETURN_REGNUM), (char *)(VALBUF),  \
311
                          TYPE_LENGTH (TYPE));                            \
312
  }
313
/* *INDENT-OFF* */
314
/* The a29k user's guide documents well what the stacks look like.
315
   But what isn't so clear there is how this interracts with the
316
   symbols, or with GDB.
317
   In the following saved_msp, saved memory stack pointer (which functions
318
   as a memory frame pointer), means either
319
   a register containing the memory frame pointer or, in the case of
320
   functions with fixed size memory frames (i.e. those who don't use
321
   alloca()), the result of the calculation msp + msize.
322
 
323
   LOC_ARG, LOC_LOCAL - For GCC, these are relative to saved_msp.
324
   For high C, these are relative to msp (making alloca impossible).
325
   LOC_REGISTER, LOC_REGPARM - The register number is the number at the
326
   time the function is running (after the prologue), or in the case
327
   of LOC_REGPARM, may be a register number in the range 160-175.
328
 
329
   The compilers do things like store an argument into memory, and then put out
330
   a LOC_ARG for it, or put it into global registers and put out a
331
   LOC_REGPARM.  Thus is it important to execute the first line of
332
   code (i.e. the line of the open brace, i.e. the prologue) of a function
333
   before trying to print arguments or anything.
334
 
335
   The following diagram attempts to depict what is going on in memory
336
   (see also the _a29k user's guide_) and also how that interacts with
337
   GDB frames.  We arbitrarily pick fci->frame to point the same place
338
   as the register stack pointer; since we set it ourself in
339
   INIT_EXTRA_FRAME_INFO, and access it only through the FRAME_*
340
   macros, it doesn't really matter exactly how we
341
   do it.  However, note that FRAME_FP is used in two ways in GDB:
342
   (1) as a "magic cookie" which uniquely identifies frames (even over
343
   calls to the inferior), (2) (in PC_IN_CALL_DUMMY [ON_STACK])
344
   as the value of SP_REGNUM before the dummy frame was pushed.  These
345
   two meanings would be incompatible for the a29k if we defined
346
   CALL_DUMMY_LOCATION == ON_STACK (but we don't, so don't worry about it).
347
   Also note that "lr1" below, while called a frame pointer
348
   in the user's guide, has only one function:  To determine whether
349
   registers need to be filled in the function epilogue.
350
 
351
   Consider the code:
352
   < call bar>
353
   loc1: . . .
354
   bar:  sub gr1,gr1,rsize_b
355
   . . .
356
   add mfp,msp,0
357
   sub msp,msp,msize_b
358
   . . .
359
   < call foo >
360
   loc2: . . .
361
   foo:  sub gr1,gr1,rsize_f
362
   . . .
363
   add mfp,msp,0
364
   sub msp,msp,msize_f
365
   . . .
366
   loc3: < suppose the inferior stops here >
367
 
368
   memory stack      register stack
369
   |           |     |____________|
370
   |           |     |____loc1____|
371
   +------->|___________|     |            |   ^
372
   |        | ^         |     |  locals_b  |   |
373
   |        | |         |     |____________|   |
374
   |        | |         |     |            |   | rsize_b
375
   |        | | msize_b |     | args_to_f  |   |
376
   |        | |         |     |____________|   |
377
   |        | |         |     |____lr1_____|   V
378
   |        | V         |     |____loc2____|<----------------+
379
   |   +--->|___________|<---------mfp     |   ^             |
380
   |   |    | ^         |     |  locals_f  |   |             |
381
   |   |    | | msize_f |     |____________|   |             |
382
   |   |    | |         |     |            |   | rsize_f     |
383
   |   |    | V         |     |   args     |   |             |
384
   |   |    |___________|<msp |____________|   |             |
385
   |   |                      |_____lr1____|   V             |
386
   |   |                      |___garbage__| <- gr1 <----+   |
387
   |   |                                                |   |
388
   |   |                                                |   |
389
   |   |                             pc=loc3                    |   |
390
   |   |                                                |   |
391
   |   |                                                |   |
392
   |   |            frame cache                         |   |
393
   |   |       |_________________|                      |   |
394
   |   |       |rsize=rsize_b    |                      |   |
395
   |   |       |msize=msize_b    |                      |   |
396
   +---|--------saved_msp        |                      |   |
397
   |       |frame------------------------------------|---+
398
   |       |pc=loc2          |                       |
399
   |       |_________________|                       |
400
   |       |rsize=rsize_f    |                       |
401
   |       |msize=msize_f    |                       |
402
   +--------saved_msp        |                       |
403
   |frame------------------------------------+
404
   |pc=loc3          |
405
   |_________________|
406
 
407
   So, is that sufficiently confusing?  Welcome to the 29000.
408
   Notes:
409
   * The frame for foo uses a memory frame pointer but the frame for
410
   bar does not.  In the latter case the saved_msp is
411
   computed by adding msize to the saved_msp of the
412
   next frame.
413
   * msize is in the frame cache only for high C's sake.  */
414
/* *INDENT-ON* */
415
 
416
 
417
void read_register_stack ();
418
long read_register_stack_integer ();
419
 
420
#define FRAME_INIT_SAVED_REGS(fi)       /*no-op */
421
 
422
#define EXTRA_FRAME_INFO  \
423
  CORE_ADDR saved_msp;    \
424
  unsigned int rsize;     \
425
  unsigned int msize;     \
426
  unsigned char flags;
427
 
428
/* Bits for flags in EXTRA_FRAME_INFO */
429
#define TRANSPARENT_FRAME       0x1     /* This is a transparent frame */
430
#define MFP_USED                0x2     /* A memory frame pointer is used */
431
 
432
/* Because INIT_FRAME_PC gets passed fromleaf, that's where we init
433
   not only ->pc and ->frame, but all the extra stuff, when called from
434
   get_prev_frame, that is.  */
435
#define INIT_EXTRA_FRAME_INFO(fromleaf, fci)  init_extra_frame_info(fci)
436
void init_extra_frame_info ();
437
 
438
#define INIT_FRAME_PC(fromleaf, fci) init_frame_pc(fromleaf, fci)
439
void init_frame_pc ();
440
 
441
 
442
/* FRAME_CHAIN takes a FRAME
443
   and produces the frame's chain-pointer.
444
 
445
   However, if FRAME_CHAIN_VALID returns zero,
446
   it means the given frame is the outermost one and has no caller.  */
447
 
448
/* On the a29k, the nominal address of a frame is the address on the
449
   register stack of the return address (the one next to the incoming
450
   arguments, not down at the bottom so nominal address == stack pointer).
451
 
452
   GDB expects "nominal address" to equal contents of FP_REGNUM,
453
   at least when it comes time to create the innermost frame.
454
   However, that doesn't work for us, so when creating the innermost
455
   frame we set ->frame ourselves in INIT_EXTRA_FRAME_INFO.  */
456
 
457
/* These are mostly dummies for the a29k because INIT_FRAME_PC
458
   sets prev->frame instead.  */
459
/* If rsize is zero, we must be at end of stack (or otherwise hosed).
460
   If we don't check rsize, we loop forever if we see rsize == 0.  */
461
#define FRAME_CHAIN(thisframe) \
462
  ((thisframe)->rsize == 0 \
463
   ? 0 \
464
   : (thisframe)->frame + (thisframe)->rsize)
465
 
466
/* Determine if the frame has a 'previous' and back-traceable frame. */
467
#define FRAME_IS_UNCHAINED(frame)       ((frame)->flags & TRANSPARENT_FRAME)
468
 
469
/* Find the previous frame of a transparent routine.
470
 * For now lets not try and trace through a transparent routine (we might
471
 * have to assume that all transparent routines are traps).
472
 */
473
#define FIND_PREV_UNCHAINED_FRAME(frame)        0
474
 
475
/* Define other aspects of the stack frame.  */
476
 
477
/* An expression that tells us whether the function invocation represented
478
   by FI does not have a frame on the stack associated with it. */
479
#define FRAMELESS_FUNCTION_INVOCATION(FI) \
480
  (frameless_look_for_prologue (FI))
481
 
482
/* Saved pc (i.e. return address).  */
483
#define FRAME_SAVED_PC(fraim) \
484
  (read_register_stack_integer ((fraim)->frame + (fraim)->rsize, 4))
485
 
486
/* Local variables (i.e. LOC_LOCAL) are on the memory stack, with their
487
   offsets being relative to the memory stack pointer (high C) or
488
   saved_msp (gcc).  */
489
 
490
#define FRAME_LOCALS_ADDRESS(fi) frame_locals_address (fi)
491
extern CORE_ADDR frame_locals_address ();
492
 
493
/* Return number of args passed to a frame.
494
   Can return -1, meaning no way to tell.  */
495
/* We tried going to the effort of finding the tags word and getting
496
   the argcount field from it, to support debugging assembler code.
497
   Problem was, the "argcount" field never did hold the argument
498
   count.  */
499
#define FRAME_NUM_ARGS(fi) (-1)
500
 
501
#define FRAME_ARGS_ADDRESS(fi) FRAME_LOCALS_ADDRESS (fi)
502
 
503
/* Return number of bytes at start of arglist that are not really args.  */
504
 
505
#define FRAME_ARGS_SKIP 0
506
 
507
/* Provide our own get_saved_register.  HAVE_REGISTER_WINDOWS is insufficient
508
   because registers get renumbered on the a29k without getting saved.  */
509
 
510
struct frame_info;
511
void a29k_get_saved_register PARAMS ((char *raw_buffer, int *optimized, CORE_ADDR * addrp, struct frame_info * frame, int regnum, enum lval_type * lvalp));
512
#define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \
513
      a29k_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
514
 
515
/* Call function stuff.  */
516
/* *INDENT-OFF* */
517
/* The dummy frame looks like this (see also the general frame picture
518
   above):
519
 
520
                                        register stack
521
 
522
                                      |                |  frame for function
523
                                      |   locals_sproc |  executing at time
524
                                      |________________|  of call_function.
525
                                      |                |  We must not disturb
526
                                      | args_out_sproc |  it.
527
        memory stack                  |________________|
528
                                      |____lr1_sproc___|<-+
529
       |            |                 |__retaddr_sproc_|  | <-- gr1 (at start)
530
       |____________|<-msp 0 <-----------mfp_dummy_____|  |
531
       |            |  (at start)     |  save regs     |  |
532
       | arg_slop   |                 |  pc0,pc1       |  |
533
       |            |                 |  pc2,lr0 sproc |  |
534
       | (16 words) |                 | gr96-gr124     |  |
535
       |____________|<-msp 1--after   | sr160-sr162    |  |
536
       |            | PUSH_DUMMY_FRAME| sr128-sr135    |  |
537
       | struct ret |                 |________________|  |
538
       | 17+        |                 |                |  |
539
       |____________|<- lrp           | args_out_dummy |  |
540
       | struct ret |                 |  (16 words)    |  |
541
       | 16         |                 |________________|  |
542
       | (16 words) |                 |____lr1_dummy___|--+
543
       |____________|<- msp 2--after  |_retaddr_dummy__|<- gr1 after
544
       |            | struct ret      |                |   PUSH_DUMMY_FRAME
545
       | margs17+   | area allocated  |  locals_inf    |
546
       |            |                 |________________|    called
547
       |____________|<- msp 4--when   |                |    function's
548
       |            |   inf called    | args_out_inf   |    frame (set up
549
       | margs16    |                 |________________|    by called
550
       | (16 words) |                 |_____lr1_inf____|    function).
551
       |____________|<- msp 3--after  |       .        |
552
       |            |   args pushed   |       .        |
553
       |            |                 |       .        |
554
                                      |                |
555
 
556
   arg_slop: This area is so that when the call dummy adds 16 words to
557
      the msp, it won't end up larger than mfp_dummy (it is needed in the
558
      case where margs and struct_ret do not add up to at least 16 words).
559
   struct ret:  This area is allocated by GDB if the return value is more
560
      than 16 words.  struct ret_16 is not used on the a29k.
561
   margs:  Pushed by GDB.  The call dummy copies the first 16 words to
562
      args_out_dummy.
563
   retaddr_sproc:  Contains the PC at the time we call the function.
564
      set by PUSH_DUMMY_FRAME and read by POP_FRAME.
565
   retaddr_dummy:  This points to a breakpoint instruction in the dummy.  */
566
/* *INDENT-ON* */
567
 
568
 
569
 
570
/* Rsize for dummy frame, in bytes.  */
571
 
572
/* Bytes for outgoing args, lr1, and retaddr.  */
573
#define DUMMY_ARG (2 * 4 + 16 * 4)
574
 
575
/* Number of special registers (sr128-) to save.  */
576
#define DUMMY_SAVE_SR128 8
577
/* Number of special registers (sr160-) to save.  */
578
#define DUMMY_SAVE_SR160 3
579
/* Number of general (gr96- or gr64-) registers to save.  */
580
#define DUMMY_SAVE_GREGS 29
581
 
582
#define DUMMY_FRAME_RSIZE \
583
(4 /* mfp_dummy */        \
584
 + 4 * 4  /* pc0, pc1, pc2, lr0 */  \
585
 + DUMMY_SAVE_GREGS * 4   \
586
 + DUMMY_SAVE_SR160 * 4   \
587
 + DUMMY_SAVE_SR128 * 4   \
588
 + DUMMY_ARG              \
589
 + 4 /* pad to doubleword */ )
590
 
591
/* Push an empty stack frame, to record the current PC, etc.  */
592
 
593
#define PUSH_DUMMY_FRAME push_dummy_frame()
594
extern void push_dummy_frame ();
595
 
596
/* Discard from the stack the innermost frame,
597
   restoring all saved registers.  */
598
 
599
#define POP_FRAME pop_frame()
600
extern void pop_frame ();
601
 
602
/* This sequence of words is the instructions
603
   mtsrim cr, 15
604
   loadm 0, 0, lr2, msp     ; load first 16 words of arguments into registers
605
   add msp, msp, 16 * 4     ; point to the remaining arguments
606
   CONST_INSN:
607
   const lr0,inf                ; (replaced by       half of target addr)
608
   consth lr0,inf               ; (replaced by other half of target addr)
609
   calli lr0, lr0
610
   aseq 0x40,gr1,gr1   ; nop
611
   BREAKPT_INSN:
612
   asneq 0x50,gr1,gr1  ; breakpoint     (replaced by local breakpoint insn)
613
 */
614
 
615
#if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
616
#define BS(const)       const
617
#else
618
#define BS(const)       (((const) & 0xff) << 24) |      \
619
                        (((const) & 0xff00) << 8) |     \
620
                        (((const) & 0xff0000) >> 8) |   \
621
                        (((const) & 0xff000000) >> 24)
622
#endif
623
 
624
/* Position of the "const" and blkt instructions within CALL_DUMMY in bytes. */
625
#define CONST_INSN (3 * 4)
626
#define BREAKPT_INSN (7 * 4)
627
#define CALL_DUMMY {    \
628
                BS(0x0400870f),\
629
                BS(0x36008200|(MSP_HW_REGNUM)), \
630
                BS(0x15000040|(MSP_HW_REGNUM<<8)|(MSP_HW_REGNUM<<16)), \
631
                BS(0x03ff80ff), \
632
                BS(0x02ff80ff), \
633
                BS(0xc8008080), \
634
                BS(0x70400101), \
635
                BS(0x72500101)}
636
#define CALL_DUMMY_LENGTH (8 * 4)
637
 
638
#define CALL_DUMMY_START_OFFSET 0       /* Start execution at beginning of dummy */
639
 
640
/* Helper macro for FIX_CALL_DUMMY.  WORDP is a long * which points to a
641
   word in target byte order; bits 0-7 and 16-23 of *WORDP are replaced with
642
   bits 0-7 and 8-15 of DATA (which is in host byte order).  */
643
 
644
#if TARGET_BYTE_ORDER == BIG_ENDIAN
645
#define STUFF_I16(WORDP, DATA) \
646
  { \
647
    *((char *)(WORDP) + 3) = ((DATA) & 0xff);\
648
    *((char *)(WORDP) + 1) = (((DATA) >> 8) & 0xff);\
649
  }
650
#else /* Target is little endian.  */
651
#define STUFF_I16(WORDP, DATA) \
652
  {
653
*(char *) (WORDP) = ((DATA) & 0xff);
654
*((char *) (WORDP) + 2) = (((DATA) >> 8) & 0xff);
655
}
656
#endif /* Target is little endian.  */
657
 
658
/* Insert the specified number of args and function address
659
   into a call sequence of the above form stored at DUMMYNAME.  */
660
 
661
/* Currently this stuffs in the address of the function that we are calling.
662
   Since different a29k systems use different breakpoint instructions, it
663
   also stuffs BREAKPOINT in the right place (to avoid having to
664
   duplicate CALL_DUMMY in each tm-*.h file).  */
665
 
666
#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
667
  {\
668
    STUFF_I16((char *)dummyname + CONST_INSN, fun);             \
669
    STUFF_I16((char *)dummyname + CONST_INSN + 4, fun >> 16);   \
670
  /* FIXME  memcpy ((char *)(dummyname) + BREAKPT_INSN, break_insn, 4); */ \
671
  }
672
 
673
/* a29k architecture has separate data & instruction memories -- wired to
674
   different pins on the chip -- and can't execute the data memory.
675
   Also, there should be space after text_end;
676
   we won't get a SIGSEGV or scribble on data space.  */
677
 
678
#define CALL_DUMMY_LOCATION AFTER_TEXT_END
679
 
680
/* Because of this, we need (as a kludge) to know the addresses of the
681
   text section.  */
682
 
683
#define NEED_TEXT_START_END 1
684
 
685
/* How to translate register numbers in the .stab's into gdb's internal register
686
   numbers.  We don't translate them, but we warn if an invalid register
687
   number is seen.  Note that FIXME, we use the value "sym" as an implicit
688
   argument in printing the error message.  It happens to be available where
689
   this macro is used.  (This macro definition appeared in a late revision
690
   of gdb-3.91.6 and is not well tested.  Also, it should be a "complaint".) */
691
 
692
#define STAB_REG_TO_REGNUM(num) \
693
        (((num) > LR0_REGNUM + 127) \
694
           ? fprintf(stderr,    \
695
                "Invalid register number %d in symbol table entry for %s\n", \
696
                 (num), SYMBOL_SOURCE_NAME (sym)), (num)        \
697
           : (num))
698
 
699
extern enum a29k_processor_types
700
{
701
  a29k_unknown,
702
 
703
  /* Bit 0x400 of the CPS does *not* identify freeze mode, i.e. 29000,
704
     29030, etc.  */
705
  a29k_no_freeze_mode,
706
 
707
  /* Bit 0x400 of the CPS does identify freeze mode, i.e. 29050.  */
708
  a29k_freeze_mode
709
}
710
processor_type;
711
 
712
/* We need three arguments for a general frame specification for the
713
   "frame" or "info frame" command.  */
714
 
715
#define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
716
extern struct frame_info *setup_arbitrary_frame PARAMS ((int, CORE_ADDR *));

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