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

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1 578 markom
/* Parameters for target machine ARC, for GDB, the GNU debugger.
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   Copyright 1995, 1996, 1998, 1999, 2000 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
#include "regcache.h"
23
 
24
/* Used by arc-tdep.c to set the default cpu type.  */
25
#define DEFAULT_ARC_CPU_TYPE "base"
26
 
27
/* Byte order is selectable.  */
28
#define TARGET_BYTE_ORDER_SELECTABLE
29
 
30
/* We have IEEE floating point, if we have any float at all.  */
31
#define IEEE_FLOAT (1)
32
 
33
/* Offset from address of function to start of its code.
34
   Zero on most machines.  */
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#define FUNCTION_START_OFFSET 0
36
 
37
/* Advance PC across any function entry prologue instructions
38
   to reach some "real" code.  SKIP_PROLOGUE_FRAMELESS_P advances
39
   the PC past some of the prologue, but stops as soon as it
40
   knows that the function has a frame.  Its result is equal
41
   to its input PC if the function is frameless, unequal otherwise.  */
42
 
43
#define SKIP_PROLOGUE(pc) (arc_skip_prologue (pc, 0))
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#define SKIP_PROLOGUE_FRAMELESS_P(pc) (arc_skip_prologue (pc, 1))
45
extern CORE_ADDR arc_skip_prologue (CORE_ADDR, int);
46
 
47
/* Sequence of bytes for breakpoint instruction.
48
   ??? The current value is "sr -1,[-1]" and is for the simulator only.
49
   The simulator watches for this and does the right thing.
50
   The hardware version will have to associate with each breakpoint
51
   the sequence "flag 1; nop; nop; nop".  IE: The breakpoint insn will not
52
   be a fixed set of bits but instead will be a branch to a semi-random
53
   address.  Presumably this will be cleaned up for "second silicon".  */
54
#define BIG_BREAKPOINT { 0x12, 0x1f, 0xff, 0xff }
55
#define LITTLE_BREAKPOINT { 0xff, 0xff, 0x1f, 0x12 }
56
 
57
/* Given the exposed pipeline, there isn't any one correct value.
58
   However, this value must be 4.  GDB can't handle any other value (other than
59
   zero).  See for example infrun.c:
60
   "prev_pc != stop_pc - DECR_PC_AFTER_BREAK"  */
61
/* FIXME */
62
#define DECR_PC_AFTER_BREAK 8
63
 
64
/* We don't have a reliable single step facility.
65
   ??? We do have a cycle single step facility, but that won't work.  */
66
#define SOFTWARE_SINGLE_STEP_P() 1
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extern void arc_software_single_step (enum target_signal, int);
68
#define SOFTWARE_SINGLE_STEP(sig,bp_p) arc_software_single_step (sig, bp_p)
69
 
70
/* FIXME: Need to set STEP_SKIPS_DELAY.  */
71
 
72
/* Given a pc value as defined by the hardware, return the real address.
73
   Remember that on the ARC blink contains that status register which
74
   includes PC + flags (so we have to mask out the flags).  */
75
#define ARC_PC_TO_REAL_ADDRESS(pc) (((pc) & 0xffffff) << 2)
76
 
77
/* Immediately after a function call, return the saved pc.
78
   Can't always go through the frames for this because on some machines
79
   the new frame is not set up until the new function
80
   executes some instructions.  */
81
 
82
#define SAVED_PC_AFTER_CALL(frame) \
83
  (ARC_PC_TO_REAL_ADDRESS (read_register (BLINK_REGNUM)))
84
 
85
/* Stack grows upward */
86
 
87
#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
88
 
89
/* Say how long (ordinary) registers are.  This is a piece of bogosity
90
   used in push_word and a few other places; REGISTER_RAW_SIZE is the
91
   real way to know how big a register is.  */
92
#define REGISTER_SIZE 4
93
 
94
/* Number of machine registers */
95
#define NUM_REGS 92
96
 
97
/* Initializer for an array of names of registers.
98
   There should be NUM_REGS strings in this initializer.  */
99
 
100
#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", \
115
    /* 86 */ "aux30", "aux31", "aux32", "aux33", "aux40", \
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    /* 91 */ "pc" \
117
}
118
 
119
/* Register numbers of various important registers (used to index
120
   into arrays of register names and register values).  */
121
 
122
#define R0_REGNUM   0           /* First local register           */
123
#define R59_REGNUM 59           /* Last local register            */
124
#define FP_REGNUM  27           /* Contains address of executing stack frame */
125
#define SP_REGNUM  28           /* stack pointer */
126
#define BLINK_REGNUM 31         /* link register */
127
#define STA_REGNUM 61           /* processor status word */
128
#define PC_REGNUM  91           /* instruction pointer */
129
#define AUX_BEG_REGNUM  61      /* aux reg begins */
130
#define AUX_END_REGNUM  90      /* aux reg ends, pc not real aux reg */
131
 
132
/* Fake registers used to mark immediate data.  */
133
#define SHIMM_FLAG_REGNUM 61
134
#define LIMM_REGNUM 62
135
#define SHIMM_REGNUM 63
136
 
137
#define AUX_REG_MAP \
138
{ \
139
   {  0,  1,  2,  3,  4,  5, \
140
     16, -1, -1, -1, -1, \
141
     -1, -1, -1, -1, -1, \
142
     -1, -1, -1, -1, 30, \
143
     -1, 32, 33, -1, \
144
      48, 49, 50, 51, 64, \
145
 
146
    }, \
147
   {  0,  1,  2,  3,  4,  5, \
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     16, -1, -1, -1, -1, \
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     -1, -1, -1, -1, -1, \
150
     -1, -1, -1, -1, 30, \
151
     31, 32, 33, -1, \
152
     -1, -1, -1, -1, -1, \
153
 
154
    }, \
155
   {  0,  1,  2,  3,  4,  5, \
156
      16, 17, 18, 19, 20, \
157
      21, 22, 23, 24, 25, \
158
      26, 27, 28, 29, 30, \
159
      31, 32, 33, 34, \
160
     -1, -1, -1, -1, -1, \
161
 
162
    } \
163
}
164
 
165
#define PFP_REGNUM R0_REGNUM    /* Previous frame pointer */
166
 
167
/* Total amount of space needed to store our copies of the machine's
168
   register state, the array `registers'.  */
169
#define REGISTER_BYTES (NUM_REGS * 4)
170
 
171
/* Index within `registers' of the first byte of the space for register N.  */
172
#define REGISTER_BYTE(N) (4*(N))
173
 
174
/* Number of bytes of storage in the actual machine representation
175
   for register N. */
176
#define REGISTER_RAW_SIZE(N) 4
177
 
178
/* Number of bytes of storage in the program's representation for register N. */
179
#define REGISTER_VIRTUAL_SIZE(N) 4
180
 
181
/* Largest value REGISTER_RAW_SIZE can have.  */
182
#define MAX_REGISTER_RAW_SIZE 4
183
 
184
/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
185
#define MAX_REGISTER_VIRTUAL_SIZE 4
186
 
187
/* Return the GDB type object for the "standard" data type
188
   of data in register N.  */
189
#define REGISTER_VIRTUAL_TYPE(N) (builtin_type_int)
190
 
191
 
192
/* Macros for understanding function return values... */
193
 
194
/* Does the specified function use the "struct returning" convention
195
   or the "value returning" convention?  The "value returning" convention
196
   almost invariably returns the entire value in registers.  The
197
   "struct returning" convention often returns the entire value in
198
   memory, and passes a pointer (out of or into the function) saying
199
   where the value (is or should go).
200
 
201
   Since this sometimes depends on whether it was compiled with GCC,
202
   this is also an argument.  This is used in call_function to build a
203
   stack, and in value_being_returned to print return values.
204
 
205
   On arc, a structure is always retunred with pointer in r0. */
206
 
207
#define USE_STRUCT_CONVENTION(gcc_p, type) 1
208
 
209
/* Extract from an array REGBUF containing the (raw) register state
210
   a function return value of type TYPE, and copy that, in virtual format,
211
   into VALBUF.  This is only called if USE_STRUCT_CONVENTION for this
212
   type is 0.
213
 */
214
#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
215
        memcpy(VALBUF, REGBUF+REGISTER_BYTE(R0_REGNUM), TYPE_LENGTH (TYPE))
216
 
217
/* If USE_STRUCT_CONVENTION produces a 1,
218
   extract from an array REGBUF containing the (raw) register state
219
   the address in which a function should return its structure value,
220
   as a CORE_ADDR (or an expression that can be used as one). */
221
#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
222
   (error("Don't know where large structure is returned on arc"), 0)
223
 
224
/* Write into appropriate registers a function return value
225
   of type TYPE, given in virtual format, for "value returning" functions.
226
   For 'return' command:  not (yet) implemented for arc.  */
227
#define STORE_RETURN_VALUE(TYPE,VALBUF) \
228
    error ("Returning values from functions is not implemented in arc gdb")
229
 
230
/* Store the address of the place in which to copy the structure the
231
   subroutine will return.  This is called from call_function. */
232
#define STORE_STRUCT_RETURN(ADDR, SP) \
233
    error ("Returning values from functions is not implemented in arc gdb")
234
 
235
 
236
/* Describe the pointer in each stack frame to the previous stack frame
237
   (its caller).  */
238
 
239
/* We cache information about saved registers in the frame structure,
240
   to save us from having to re-scan function prologues every time
241
   a register in a non-current frame is accessed.  */
242
 
243
#define EXTRA_FRAME_INFO \
244
        struct frame_saved_regs *fsr; \
245
        CORE_ADDR arg_pointer;
246
 
247
/* Zero the frame_saved_regs pointer when the frame is initialized,
248
   so that FRAME_FIND_SAVED_REGS () will know to allocate and
249
   initialize a frame_saved_regs struct the first time it is called.
250
   Set the arg_pointer to -1, which is not valid; 0 and other values
251
   indicate real, cached values.  */
252
 
253
#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
254
        ((fi)->fsr = 0, (fi)->arg_pointer = -1)
255
 
256
/* FRAME_CHAIN takes a frame's nominal address
257
   and produces the frame's chain-pointer.
258
   However, if FRAME_CHAIN_VALID returns zero,
259
   it means the given frame is the outermost one and has no caller.  */
260
/* On the arc, we get the chain pointer by reading the PFP saved
261
   on the stack. */
262
/* The PFP and RPC is in fp and fp+4.  */
263
 
264
#define FRAME_CHAIN(thisframe) \
265
  (read_memory_integer (FRAME_FP (thisframe), 4))
266
 
267
/* FRAME_CHAIN_VALID returns zero if the given frame is the outermost one
268
   and has no caller.  */
269
#define FRAME_CHAIN_VALID(chain, thisframe) nonnull_frame_chain_valid (chain, thisframe)
270
 
271
/* An expression that tells us whether the function invocation represented
272
   by FI does not have a frame on the stack associated with it. */
273
 
274
#define FRAMELESS_FUNCTION_INVOCATION(FI) \
275
     (((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue (FI))
276
 
277
/* Where is the PC for a specific frame.
278
   A leaf function may never save blink, so we have to check for that here.  */
279
 
280
#define FRAME_SAVED_PC(frame) (arc_frame_saved_pc (frame))
281
struct frame_info;              /* in case frame.h not included yet */
282
CORE_ADDR arc_frame_saved_pc (struct frame_info *);
283
 
284
/* If the argument is on the stack, it will be here.
285
   We cache this value in the frame info if we've already looked it up.  */
286
/* ??? Is the arg_pointer check necessary?  */
287
 
288
#define FRAME_ARGS_ADDRESS(fi) \
289
  (((fi)->arg_pointer != -1) ? (fi)->arg_pointer : (fi)->frame)
290
 
291
/* This is the same except it should return 0 when
292
   it does not really know where the args are, rather than guessing.
293
   This value is not cached since it is only used infrequently.  */
294
 
295
#define FRAME_LOCALS_ADDRESS(fi)        ((fi)->frame)
296
 
297
/* Set NUMARGS to the number of args passed to a frame.
298
   Can return -1, meaning no way to tell.  */
299
 
300
#define FRAME_NUM_ARGS(fi)      (-1)
301
 
302
/* Return number of bytes at start of arglist that are not really args.  */
303
 
304
#define FRAME_ARGS_SKIP 0
305
 
306
/* Produce the positions of the saved registers in a stack frame.  */
307
 
308
#define FRAME_FIND_SAVED_REGS(frame_info_addr, sr) \
309
        frame_find_saved_regs (frame_info_addr, &sr)
310
extern void frame_find_saved_regs ();   /* See arc-tdep.c */
311
 
312
 
313
/* Things needed for making calls to functions in the inferior process */
314
void arc_push_dummy_frame (void);
315
#define PUSH_DUMMY_FRAME \
316
        arc_push_dummy_frame ()
317
 
318
/* Discard from the stack the innermost frame, restoring all registers.  */
319
void arc_pop_frame (void);
320
#define POP_FRAME \
321
        arc_pop_frame ()
322
 
323
/* This sequence of words is the instructions  bl xxxx, flag 1 */
324
#define CALL_DUMMY { 0x28000000, 0x1fbe8001 }
325
#define CALL_DUMMY_LENGTH 8
326
 
327
/* Start execution at beginning of dummy */
328
#define CALL_DUMMY_START_OFFSET 0
329
 
330
/* Insert the specified number of args and function address
331
   into a call sequence of the above form stored at 'dummyname'. */
332
#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
333
{ \
334
        int from, to, delta, loc; \
335
        loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \
336
        from = loc + 4; \
337
        to = (int)(fun); \
338
        delta = (to - from) >> 2; \
339
        *((char *)(dummyname) + 1) = (delta & 0x1); \
340
        *((char *)(dummyname) + 2) = ((delta >> 1) & 0xff); \
341
        *((char *)(dummyname) + 3) = ((delta >> 9) & 0xff); \
342
        *((char *)(dummyname) + 4) = ((delta >> 17) & 0x7); \
343
}

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