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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [config/] [arc/] [tm-arc.h] - Blame information for rev 106

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1 106 markom
/* Parameters for target machine ARC, for GDB, the GNU debugger.
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   Copyright (C) 1995 Free Software Foundation, Inc.
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   Contributed by Cygnus Support.
4
 
5
   This file is part of GDB.
6
 
7
   This program is free software; you can redistribute it and/or modify
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   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,
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   Boston, MA 02111-1307, USA.  */
21
 
22
/* Used by arc-tdep.c to set the default cpu type.  */
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#define DEFAULT_ARC_CPU_TYPE "base"
24
 
25
/* Byte order is selectable.  */
26
#define TARGET_BYTE_ORDER_SELECTABLE
27
 
28
/* We have IEEE floating point, if we have any float at all.  */
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#define IEEE_FLOAT
30
 
31
/* Offset from address of function to start of its code.
32
   Zero on most machines.  */
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#define FUNCTION_START_OFFSET 0
34
 
35
/* Advance PC across any function entry prologue instructions
36
   to reach some "real" code.  SKIP_PROLOGUE_FRAMELESS_P advances
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   the PC past some of the prologue, but stops as soon as it
38
   knows that the function has a frame.  Its result is equal
39
   to its input PC if the function is frameless, unequal otherwise.  */
40
 
41
#define SKIP_PROLOGUE(pc) (arc_skip_prologue (pc, 0))
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#define SKIP_PROLOGUE_FRAMELESS_P(pc) (arc_skip_prologue (pc, 1))
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extern CORE_ADDR arc_skip_prologue PARAMS ((CORE_ADDR, int));
44
 
45
/* Sequence of bytes for breakpoint instruction.
46
   ??? The current value is "sr -1,[-1]" and is for the simulator only.
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   The simulator watches for this and does the right thing.
48
   The hardware version will have to associate with each breakpoint
49
   the sequence "flag 1; nop; nop; nop".  IE: The breakpoint insn will not
50
   be a fixed set of bits but instead will be a branch to a semi-random
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   address.  Presumably this will be cleaned up for "second silicon".  */
52
#define BIG_BREAKPOINT { 0x12, 0x1f, 0xff, 0xff }
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#define LITTLE_BREAKPOINT { 0xff, 0xff, 0x1f, 0x12 }
54
 
55
/* Given the exposed pipeline, there isn't any one correct value.
56
   However, this value must be 4.  GDB can't handle any other value (other than
57
   zero).  See for example infrun.c:
58
   "prev_pc != stop_pc - DECR_PC_AFTER_BREAK"  */
59
/* FIXME */
60
#define DECR_PC_AFTER_BREAK 8
61
 
62
/* We don't have a reliable single step facility.
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   ??? We do have a cycle single step facility, but that won't work.  */
64
#define SOFTWARE_SINGLE_STEP_P 1
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extern void arc_software_single_step PARAMS ((unsigned int, int));
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#define SOFTWARE_SINGLE_STEP(sig,bp_p) arc_software_single_step (sig, bp_p)
67
 
68
/* FIXME: Need to set STEP_SKIPS_DELAY.  */
69
 
70
/* Given a pc value as defined by the hardware, return the real address.
71
   Remember that on the ARC blink contains that status register which
72
   includes PC + flags (so we have to mask out the flags).  */
73
#define ARC_PC_TO_REAL_ADDRESS(pc) (((pc) & 0xffffff) << 2)
74
 
75
/* Immediately after a function call, return the saved pc.
76
   Can't always go through the frames for this because on some machines
77
   the new frame is not set up until the new function
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   executes some instructions.  */
79
 
80
#define SAVED_PC_AFTER_CALL(frame) \
81
  (ARC_PC_TO_REAL_ADDRESS (read_register (BLINK_REGNUM)))
82
 
83
/* Stack grows upward */
84
 
85
#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
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
#define REGISTER_SIZE 4
91
 
92
/* Number of machine registers */
93
#define NUM_REGS 92
94
 
95
/* Initializer for an array of names of registers.
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   There should be NUM_REGS strings in this initializer.  */
97
 
98
#define REGISTER_NAMES \
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{ \
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    /*  0 */ "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7", \
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    /*  8 */ "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15", \
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    /* 16 */ "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
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    /* 24 */ "r24", "r25", "r26", "fp", "sp", "ilink1", "ilink2", "blink", \
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    /* 32 */ "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39", \
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    /* 40 */ "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47", \
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    /* 48 */ "r48", "r49", "r50", "r51", "r52", "r53", "r54", "r55", \
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    /* 56 */ "r56", "mlo", "mmid", "mhi", "lp_count", \
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    /* 61 */ "status", "sema", "lp_start", "lp_end", "identity", "debug", \
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    /* 67 */ "aux10", "aux11", "aux12", "aux13", "aux14", \
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    /* 72 */ "aux15", "aux16", "aux17", "aux18", "aux19", \
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    /* 77 */ "aux1a", "aux1b", "aux1c", "aux1d", "aux1e", \
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    /* 82 */ "aux1f", "aux20", "aux21", "aux22", \
113
    /* 86 */ "aux30", "aux31", "aux32", "aux33", "aux40", \
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    /* 91 */ "pc" \
115
}
116
 
117
/* Register numbers of various important registers (used to index
118
   into arrays of register names and register values).  */
119
 
120
#define R0_REGNUM   0           /* First local register           */
121
#define R59_REGNUM 59           /* Last local register            */
122
#define FP_REGNUM  27           /* Contains address of executing stack frame */
123
#define SP_REGNUM  28           /* stack pointer */
124
#define BLINK_REGNUM 31         /* link register */
125
#define STA_REGNUM 61           /* processor status word */
126
#define PC_REGNUM  91           /* instruction pointer */
127
#define AUX_BEG_REGNUM  61      /* aux reg begins */
128
#define AUX_END_REGNUM  90      /* aux reg ends, pc not real aux reg */
129
 
130
/* Fake registers used to mark immediate data.  */
131
#define SHIMM_FLAG_REGNUM 61
132
#define LIMM_REGNUM 62
133
#define SHIMM_REGNUM 63
134
 
135
#define AUX_REG_MAP \
136
{ \
137
   {  0,  1,  2,  3,  4,  5, \
138
     16, -1, -1, -1, -1, \
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     -1, -1, -1, -1, -1, \
140
     -1, -1, -1, -1, 30, \
141
     -1, 32, 33, -1, \
142
      48, 49, 50, 51, 64, \
143
 
144
    }, \
145
   {  0,  1,  2,  3,  4,  5, \
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     16, -1, -1, -1, -1, \
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     -1, -1, -1, -1, -1, \
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     -1, -1, -1, -1, 30, \
149
     31, 32, 33, -1, \
150
     -1, -1, -1, -1, -1, \
151
 
152
    }, \
153
   {  0,  1,  2,  3,  4,  5, \
154
      16, 17, 18, 19, 20, \
155
      21, 22, 23, 24, 25, \
156
      26, 27, 28, 29, 30, \
157
      31, 32, 33, 34, \
158
     -1, -1, -1, -1, -1, \
159
 
160
    } \
161
}
162
 
163
#define PFP_REGNUM R0_REGNUM    /* Previous frame pointer */
164
 
165
/* Total amount of space needed to store our copies of the machine's
166
   register state, the array `registers'.  */
167
#define REGISTER_BYTES (NUM_REGS * 4)
168
 
169
/* Index within `registers' of the first byte of the space for register N.  */
170
#define REGISTER_BYTE(N) (4*(N))
171
 
172
/* Number of bytes of storage in the actual machine representation
173
   for register N. */
174
#define REGISTER_RAW_SIZE(N) 4
175
 
176
/* Number of bytes of storage in the program's representation for register N. */
177
#define REGISTER_VIRTUAL_SIZE(N) 4
178
 
179
/* Largest value REGISTER_RAW_SIZE can have.  */
180
#define MAX_REGISTER_RAW_SIZE 4
181
 
182
/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
183
#define MAX_REGISTER_VIRTUAL_SIZE 4
184
 
185
/* Return the GDB type object for the "standard" data type
186
   of data in register N.  */
187
#define REGISTER_VIRTUAL_TYPE(N) (builtin_type_int)
188
 
189
 
190
/* Macros for understanding function return values... */
191
 
192
/* Does the specified function use the "struct returning" convention
193
   or the "value returning" convention?  The "value returning" convention
194
   almost invariably returns the entire value in registers.  The
195
   "struct returning" convention often returns the entire value in
196
   memory, and passes a pointer (out of or into the function) saying
197
   where the value (is or should go).
198
 
199
   Since this sometimes depends on whether it was compiled with GCC,
200
   this is also an argument.  This is used in call_function to build a
201
   stack, and in value_being_returned to print return values.
202
 
203
   On arc, a structure is always retunred with pointer in r0. */
204
 
205
#define USE_STRUCT_CONVENTION(gcc_p, type) 1
206
 
207
/* Extract from an array REGBUF containing the (raw) register state
208
   a function return value of type TYPE, and copy that, in virtual format,
209
   into VALBUF.  This is only called if USE_STRUCT_CONVENTION for this
210
   type is 0.
211
 */
212
#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
213
        memcpy(VALBUF, REGBUF+REGISTER_BYTE(R0_REGNUM), TYPE_LENGTH (TYPE))
214
 
215
/* If USE_STRUCT_CONVENTION produces a 1,
216
   extract from an array REGBUF containing the (raw) register state
217
   the address in which a function should return its structure value,
218
   as a CORE_ADDR (or an expression that can be used as one). */
219
#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
220
   (error("Don't know where large structure is returned on arc"), 0)
221
 
222
/* Write into appropriate registers a function return value
223
   of type TYPE, given in virtual format, for "value returning" functions.
224
   For 'return' command:  not (yet) implemented for arc.  */
225
#define STORE_RETURN_VALUE(TYPE,VALBUF) \
226
    error ("Returning values from functions is not implemented in arc gdb")
227
 
228
/* Store the address of the place in which to copy the structure the
229
   subroutine will return.  This is called from call_function. */
230
#define STORE_STRUCT_RETURN(ADDR, SP) \
231
    error ("Returning values from functions is not implemented in arc gdb")
232
 
233
 
234
/* Describe the pointer in each stack frame to the previous stack frame
235
   (its caller).  */
236
 
237
/* We cache information about saved registers in the frame structure,
238
   to save us from having to re-scan function prologues every time
239
   a register in a non-current frame is accessed.  */
240
 
241
#define EXTRA_FRAME_INFO \
242
        struct frame_saved_regs *fsr; \
243
        CORE_ADDR arg_pointer;
244
 
245
/* Zero the frame_saved_regs pointer when the frame is initialized,
246
   so that FRAME_FIND_SAVED_REGS () will know to allocate and
247
   initialize a frame_saved_regs struct the first time it is called.
248
   Set the arg_pointer to -1, which is not valid; 0 and other values
249
   indicate real, cached values.  */
250
 
251
#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
252
        ((fi)->fsr = 0, (fi)->arg_pointer = -1)
253
 
254
/* FRAME_CHAIN takes a frame's nominal address
255
   and produces the frame's chain-pointer.
256
   However, if FRAME_CHAIN_VALID returns zero,
257
   it means the given frame is the outermost one and has no caller.  */
258
/* On the arc, we get the chain pointer by reading the PFP saved
259
   on the stack. */
260
/* The PFP and RPC is in fp and fp+4.  */
261
 
262
#define FRAME_CHAIN(thisframe) \
263
  (read_memory_integer (FRAME_FP (thisframe), 4))
264
 
265
/* FRAME_CHAIN_VALID returns zero if the given frame is the outermost one
266
   and has no caller.  */
267
#define FRAME_CHAIN_VALID(chain, thisframe) nonnull_frame_chain_valid (chain, thisframe)
268
 
269
/* An expression that tells us whether the function invocation represented
270
   by FI does not have a frame on the stack associated with it. */
271
 
272
#define FRAMELESS_FUNCTION_INVOCATION(FI) \
273
     (((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue (FI))
274
 
275
/* Where is the PC for a specific frame.
276
   A leaf function may never save blink, so we have to check for that here.  */
277
 
278
#define FRAME_SAVED_PC(frame) (arc_frame_saved_pc (frame))
279
struct frame_info;              /* in case frame.h not included yet */
280
CORE_ADDR arc_frame_saved_pc PARAMS ((struct frame_info *));
281
 
282
/* If the argument is on the stack, it will be here.
283
   We cache this value in the frame info if we've already looked it up.  */
284
/* ??? Is the arg_pointer check necessary?  */
285
 
286
#define FRAME_ARGS_ADDRESS(fi) \
287
  (((fi)->arg_pointer != -1) ? (fi)->arg_pointer : (fi)->frame)
288
 
289
/* This is the same except it should return 0 when
290
   it does not really know where the args are, rather than guessing.
291
   This value is not cached since it is only used infrequently.  */
292
 
293
#define FRAME_LOCALS_ADDRESS(fi)        ((fi)->frame)
294
 
295
/* Set NUMARGS to the number of args passed to a frame.
296
   Can return -1, meaning no way to tell.  */
297
 
298
#define FRAME_NUM_ARGS(fi)      (-1)
299
 
300
/* Return number of bytes at start of arglist that are not really args.  */
301
 
302
#define FRAME_ARGS_SKIP 0
303
 
304
/* Produce the positions of the saved registers in a stack frame.  */
305
 
306
#define FRAME_FIND_SAVED_REGS(frame_info_addr, sr) \
307
        frame_find_saved_regs (frame_info_addr, &sr)
308
extern void frame_find_saved_regs ();   /* See arc-tdep.c */
309
 
310
 
311
/* Things needed for making calls to functions in the inferior process */
312
void arc_push_dummy_frame (void);
313
#define PUSH_DUMMY_FRAME \
314
        arc_push_dummy_frame ()
315
 
316
/* Discard from the stack the innermost frame, restoring all registers.  */
317
void arc_pop_frame (void);
318
#define POP_FRAME \
319
        arc_pop_frame ()
320
 
321
/* This sequence of words is the instructions  bl xxxx, flag 1 */
322
#define CALL_DUMMY { 0x28000000, 0x1fbe8001 }
323
#define CALL_DUMMY_LENGTH 8
324
 
325
/* Start execution at beginning of dummy */
326
#define CALL_DUMMY_START_OFFSET 0
327
 
328
/* Insert the specified number of args and function address
329
   into a call sequence of the above form stored at 'dummyname'. */
330
#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
331
{ \
332
        int from, to, delta, loc; \
333
        loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \
334
        from = loc + 4; \
335
        to = (int)(fun); \
336
        delta = (to - from) >> 2; \
337
        *((char *)(dummyname) + 1) = (delta & 0x1); \
338
        *((char *)(dummyname) + 2) = ((delta >> 1) & 0xff); \
339
        *((char *)(dummyname) + 3) = ((delta >> 9) & 0xff); \
340
        *((char *)(dummyname) + 4) = ((delta >> 17) & 0x7); \
341
}

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