1 /* Parameters for SPARC target machines, for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@mcc.com)
5 This file is part of GDB.
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.
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.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #define TARGET_BYTE_ORDER BIG_ENDIAN
23 /* Floating point is IEEE compatible. */
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 /* When passing a structure to a function, Sun cc passes the address
32 in a register, not the structure itself. It (under SunOS4) creates
33 two symbols, so we get a LOC_ARG saying the address is on the stack
34 (a lie, and a serious one since we don't know which register to
35 use), and a LOC_REGISTER saying that the struct is in a register
36 (sort of a lie, but fixable with REG_STRUCT_HAS_ADDR). Gcc version
37 two (as of 1.92) behaves like sun cc, but I don't know how we can
38 distinguish between gcc version 1 and gcc version 2.
40 This still doesn't work if the argument is not one passed in a
41 register (i.e. it's the 7th or later argument). */
42 #define REG_STRUCT_HAS_ADDR(gcc_p) (!(gcc_p))
43 #define STRUCT_ARG_SYM_GARBAGE(gcc_p) (!(gcc_p))
45 /* If Pcc says that a parameter is a short, it's a short. This is
46 because the parameter does get passed in in a register as an int,
47 but pcc puts it onto the stack frame as a short (not nailing
48 whatever else might be there. I'm not sure that I consider this
51 No, don't do this. The problem here is that pcc says that the
52 argument is in the upper half of the word reserved on the stack,
53 but puts it in the lower half. */
54 /* #define BELIEVE_PCC_PROMOTION 1 */
55 /* OK, I've added code to dbxread.c to deal with this case. */
56 #define BELIEVE_PCC_PROMOTION_TYPE
58 /* Offset from address of function to start of its code.
59 Zero on most machines. */
61 #define FUNCTION_START_OFFSET 0
63 /* Advance PC across any function entry prologue instructions
64 to reach some "real" code. SKIP_PROLOGUE_FRAMELESS_P advances
65 the PC past some of the prologue, but stops as soon as it
66 knows that the function has a frame. Its result is equal
67 to its input PC if the function is frameless, unequal otherwise. */
69 #define SKIP_PROLOGUE(pc) \
70 { pc = skip_prologue (pc, 0); }
71 #define SKIP_PROLOGUE_FRAMELESS_P(pc) \
72 { pc = skip_prologue (pc, 1); }
73 extern CORE_ADDR
skip_prologue ();
75 /* Immediately after a function call, return the saved pc.
76 Can't go through the frames for this because on some machines
77 the new frame is not set up until the new function executes
80 /* On the Sun 4 under SunOS, the compile will leave a fake insn which
81 encodes the structure size being returned. If we detect such
82 a fake insn, step past it. */
84 #define PC_ADJUST(pc) sparc_pc_adjust(pc)
85 extern CORE_ADDR
sparc_pc_adjust();
87 #define SAVED_PC_AFTER_CALL(frame) PC_ADJUST (read_register (RP_REGNUM))
89 /* Stack grows downward. */
93 /* Stack has strict alignment. */
95 #define STACK_ALIGN(ADDR) (((ADDR)+7)&-8)
97 /* Sequence of bytes for breakpoint instruction. */
99 #define BREAKPOINT {0x91, 0xd0, 0x20, 0x01}
101 /* Amount PC must be decremented by after a breakpoint.
102 This is often the number of bytes in BREAKPOINT
105 #define DECR_PC_AFTER_BREAK 0
107 /* Nonzero if instruction at PC is a return instruction. */
108 /* For SPARC, this is either a "jmpl %o7+8,%g0" or "jmpl %i7+8,%g0".
110 Note: this does not work for functions returning structures under SunOS. */
111 #define ABOUT_TO_RETURN(pc) \
112 ((read_memory_integer (pc, 4)|0x00040000) == 0x81c7e008)
114 /* Return 1 if P points to an invalid floating point value. */
116 #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
118 /* Say how long (ordinary) registers are. */
120 #define REGISTER_TYPE long
122 /* Number of machine registers */
126 /* Initializer for an array of names of registers.
127 There should be NUM_REGS strings in this initializer. */
129 #define REGISTER_NAMES \
130 { "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7", \
131 "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7", \
132 "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7", \
133 "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7", \
135 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
136 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
137 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
138 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
140 "y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr" };
142 /* Register numbers of various important registers.
143 Note that some of these values are "real" register numbers,
144 and correspond to the general registers of the machine,
145 and some are "phony" register numbers which are too large
146 to be actual register numbers as far as the user is concerned
147 but do serve to get the desired values when passed to read_register. */
149 #define G0_REGNUM 0 /* %g0 */
150 #define G1_REGNUM 1 /* %g1 */
151 #define O0_REGNUM 8 /* %o0 */
152 #define SP_REGNUM 14 /* Contains address of top of stack, \
153 which is also the bottom of the frame. */
154 #define RP_REGNUM 15 /* Contains return address value, *before* \
155 any windows get switched. */
156 #define O7_REGNUM 15 /* Last local reg not saved on stack frame */
157 #define L0_REGNUM 16 /* First local reg that's saved on stack frame
158 rather than in machine registers */
159 #define I0_REGNUM 24 /* %i0 */
160 #define FP_REGNUM 30 /* Contains address of executing stack frame */
161 #define I7_REGNUM 31 /* Last local reg saved on stack frame */
162 #define FP0_REGNUM 32 /* Floating point register 0 */
163 #define Y_REGNUM 64 /* Temp register for multiplication, etc. */
164 #define PS_REGNUM 65 /* Contains processor status */
165 #define WIM_REGNUM 66 /* Window Invalid Mask (not really supported) */
166 #define TBR_REGNUM 67 /* Trap Base Register (not really supported) */
167 #define PC_REGNUM 68 /* Contains program counter */
168 #define NPC_REGNUM 69 /* Contains next PC */
169 #define FPS_REGNUM 70 /* Floating point status register */
170 #define CPS_REGNUM 71 /* Coprocessor status register */
172 /* Total amount of space needed to store our copies of the machine's
173 register state, the array `registers'. */
174 #define REGISTER_BYTES (32*4+32*4+8*4)
176 /* Index within `registers' of the first byte of the space for
179 #define REGISTER_BYTE(N) ((N)*4)
181 /* The SPARC processor has register windows. */
183 #define HAVE_REGISTER_WINDOWS
185 /* Is this register part of the register window system? A yes answer
186 implies that 1) The name of this register will not be the same in
187 other frames, and 2) This register is automatically "saved" (out
188 registers shifting into ins counts) upon subroutine calls and thus
189 there is no need to search more than one stack frame for it. */
191 #define REGISTER_IN_WINDOW_P(regnum) \
192 ((regnum) >= 8 && (regnum) < 32)
194 /* Number of bytes of storage in the actual machine representation
197 /* On the SPARC, all regs are 4 bytes. */
199 #define REGISTER_RAW_SIZE(N) (4)
201 /* Number of bytes of storage in the program's representation
204 /* On the SPARC, all regs are 4 bytes. */
206 #define REGISTER_VIRTUAL_SIZE(N) (4)
208 /* Largest value REGISTER_RAW_SIZE can have. */
210 #define MAX_REGISTER_RAW_SIZE 8
212 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
214 #define MAX_REGISTER_VIRTUAL_SIZE 8
216 /* Nonzero if register N requires conversion
217 from raw format to virtual format. */
219 #define REGISTER_CONVERTIBLE(N) (0)
221 /* Convert data from raw format for register REGNUM
222 to virtual format for register REGNUM. */
224 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
225 { bcopy ((FROM), (TO), 4); }
227 /* Convert data from virtual format for register REGNUM
228 to raw format for register REGNUM. */
230 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
231 { bcopy ((FROM), (TO), 4); }
233 /* Return the GDB type object for the "standard" data type
234 of data in register N. */
236 #define REGISTER_VIRTUAL_TYPE(N) \
237 ((N) < 32 ? builtin_type_int : (N) < 64 ? builtin_type_float : \
240 /* Writing to %g0 is a noop (not an error or exception or anything like
243 #define CANNOT_STORE_REGISTER(regno) ((regno) == G0_REGNUM)
245 /* Store the address of the place in which to copy the structure the
246 subroutine will return. This is called from call_function. */
248 #define STORE_STRUCT_RETURN(ADDR, SP) \
249 { target_write_memory ((SP)+(16*4), (char *)&(ADDR), 4); }
251 /* Extract from an array REGBUF containing the (raw) register state
252 a function return value of type TYPE, and copy that, in virtual format,
255 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
257 if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
259 bcopy (((int *)(REGBUF))+FP0_REGNUM, \
260 (VALBUF), TYPE_LENGTH(TYPE)); \
263 bcopy ((char *)(REGBUF) + 4 * 8 + \
264 (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)), \
265 (VALBUF), TYPE_LENGTH(TYPE)); \
268 /* Write into appropriate registers a function return value
269 of type TYPE, given in virtual format. */
270 /* On sparc, values are returned in register %o0. */
271 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
273 if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
274 /* Floating-point values are returned in the register pair */ \
275 /* formed by %f0 and %f1 (doubles are, anyway). */ \
276 write_register_bytes (REGISTER_BYTE (FP0_REGNUM), (VALBUF), \
277 TYPE_LENGTH (TYPE)); \
279 /* Other values are returned in register %o0. */ \
280 write_register_bytes (REGISTER_BYTE (O0_REGNUM), (VALBUF), \
281 TYPE_LENGTH (TYPE)); \
284 /* Extract from an array REGBUF containing the (raw) register state
285 the address in which a function should return its structure value,
286 as a CORE_ADDR (or an expression that can be used as one). */
288 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
289 (sparc_extract_struct_value_address (REGBUF))
292 sparc_extract_struct_value_address
PARAMS ((char [REGISTER_BYTES
]));
295 /* Describe the pointer in each stack frame to the previous stack frame
298 /* FRAME_CHAIN takes a frame's nominal address
299 and produces the frame's chain-pointer. */
301 /* In the case of the Sun 4, the frame-chain's nominal address
302 is held in the frame pointer register.
304 On the Sun4, the frame (in %fp) is %sp for the previous frame.
305 From the previous frame's %sp, we can find the previous frame's
306 %fp: it is in the save area just above the previous frame's %sp.
308 If we are setting up an arbitrary frame, we'll need to know where
309 it ends. Hence the following. This part of the frame cache
310 structure should be checked before it is assumed that this frame's
311 bottom is in the stack pointer.
313 If there isn't a frame below this one, the bottom of this frame is
314 in the stack pointer.
316 If there is a frame below this one, and the frame pointers are
317 identical, it's a leaf frame and the bottoms are the same also.
319 Otherwise the bottom of this frame is the top of the next frame. */
321 #define EXTRA_FRAME_INFO FRAME_ADDR bottom;
322 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
325 ((fci)->frame == (fci)->next_frame ? \
326 (fci)->next->bottom : (fci)->next->frame) : \
327 read_register (SP_REGNUM));
329 #define FRAME_CHAIN(thisframe) (sparc_frame_chain (thisframe))
330 CORE_ADDR
sparc_frame_chain ();
332 /* Define other aspects of the stack frame. */
334 /* A macro that tells us whether the function invocation represented
335 by FI does not have a frame on the stack associated with it. If it
336 does not, FRAMELESS is set to 1, else 0. */
337 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
338 (FRAMELESS) = frameless_look_for_prologue(FI)
340 /* Where is the PC for a specific frame */
342 #define FRAME_SAVED_PC(FRAME) frame_saved_pc (FRAME)
343 CORE_ADDR
frame_saved_pc ();
345 /* If the argument is on the stack, it will be here. */
346 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
348 #define FRAME_STRUCT_ARGS_ADDRESS(fi) ((fi)->frame)
350 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
352 /* Set VAL to the number of args passed to frame described by FI.
353 Can set VAL to -1, meaning no way to tell. */
355 /* We can't tell how many args there are
356 now that the C compiler delays popping them. */
357 #define FRAME_NUM_ARGS(val,fi) (val = -1)
359 /* Return number of bytes at start of arglist that are not really args. */
361 #define FRAME_ARGS_SKIP 68
363 /* Put here the code to store, into a struct frame_saved_regs,
364 the addresses of the saved registers of frame described by FRAME_INFO.
365 The actual code is in sparc-tdep.c so we can debug it sanely. */
367 #define FRAME_FIND_SAVED_REGS(fi, frame_saved_regs) \
368 sparc_frame_find_saved_regs ((fi), &(frame_saved_regs))
369 extern void sparc_frame_find_saved_regs ();
371 /* Things needed for making the inferior call functions. */
373 * First of all, let me give my opinion of what the DUMMY_FRAME
374 * actually looks like.
378 * + - - - - - - - - - - - - - - - - +<-- fp (level 0)
383 * | Frame of innermost program |
390 * |---------------------------------|<-- sp (level 0), fp (c)
394 * | ------ |<-- fp - 0x80
395 * FRAME | g0-7 |<-- fp - 0xa0
396 * | i0-7 |<-- fp - 0xc0
397 * | other |<-- fp - 0xe0
400 * |---------------------------------|<-- sp' = fp - 0x140
403 * sp' + 0x94 -->| CALL_DUMMY (x code) |
406 * |---------------------------------|<-- sp'' = fp - 0x200
407 * | align sp to 8 byte boundary |
408 * | ==> args to fn <== |
410 * i & l's + agg | CALL_DUMMY_STACK_ADJUST = 0x0x44|
411 * |---------------------------------|<-- final sp (variable)
413 * | Where function called will |
418 * I understand everything in this picture except what the space
419 * between fp - 0xe0 and fp - 0x140 is used for. Oh, and I don't
420 * understand why there's a large chunk of CALL_DUMMY that never gets
421 * executed (its function is superceeded by PUSH_DUMMY_FRAME; they
422 * are designed to do the same thing).
424 * PUSH_DUMMY_FRAME saves the registers above sp' and pushes the
425 * register file stack down one.
427 * call_function then writes CALL_DUMMY, pushes the args onto the
428 * stack, and adjusts the stack pointer.
430 * run_stack_dummy then starts execution (in the middle of
431 * CALL_DUMMY, as directed by call_function).
434 /* Push an empty stack frame, to record the current PC, etc. */
436 #define PUSH_DUMMY_FRAME sparc_push_dummy_frame ()
437 #define POP_FRAME sparc_pop_frame ()
439 void sparc_push_dummy_frame (), sparc_pop_frame ();
440 /* This sequence of words is the instructions
467 nop ! stcsr [%fp-0xc4]
468 nop ! stfsr [%fp-0xc8]
469 nop ! wr %npc,[%fp-0xcc]
470 nop ! wr %pc,[%fp-0xd0]
480 /..* The arguments are pushed at this point by GDB;
481 no code is needed in the dummy for this.
482 The CALL_DUMMY_START_OFFSET gives the position of
483 the following ld instruction. *../
496 note that this is 192 bytes, which is a multiple of 8 (not only 4) bytes.
497 note that the `call' insn is a relative, not an absolute call.
498 note that the `nop' at the end is needed to keep the trap from
499 clobbering things (if NPC pointed to garbage instead).
501 We actually start executing at the `sethi', since the pushing of the
502 registers (as arguments) is done by PUSH_DUMMY_FRAME. If this were
503 real code, the arguments for the function called by the CALL would be
504 pushed between the list of ST insns and the CALL, and we could allow
505 it to execute through. But the arguments have to be pushed by GDB
506 after the PUSH_DUMMY_FRAME is done, and we cannot allow these ST
507 insns to be performed again, lest the registers saved be taken for
510 #define CALL_DUMMY { 0x9de3bee0, 0xfd3fbff8, 0xf93fbff0, 0xf53fbfe8, \
511 0xf13fbfe0, 0xed3fbfd8, 0xe93fbfd0, 0xe53fbfc8, \
512 0xe13fbfc0, 0xdd3fbfb8, 0xd93fbfb0, 0xd53fbfa8, \
513 0xd13fbfa0, 0xcd3fbf98, 0xc93fbf90, 0xc53fbf88, \
514 0xc13fbf80, 0xcc3fbf78, 0xc83fbf70, 0xc43fbf68, \
515 0xc03fbf60, 0xfc3fbf58, 0xf83fbf50, 0xf43fbf48, \
516 0xf03fbf40, 0x01000000, 0x01000000, 0x01000000, \
517 0x01000000, 0x91580000, 0xd027bf50, 0x93500000, \
518 0xd027bf4c, 0x91480000, 0xd027bf48, 0x91400000, \
519 0xd027bf44, 0xda03a058, 0xd803a054, 0xd603a050, \
520 0xd403a04c, 0xd203a048, 0x40000000, 0xd003a044, \
521 0x01000000, 0x91d02001, 0x01000000, 0x01000000}
523 #define CALL_DUMMY_LENGTH 192
525 #define CALL_DUMMY_START_OFFSET 148
527 #define CALL_DUMMY_STACK_ADJUST 68
529 /* Insert the specified number of args and function address
530 into a call sequence of the above form stored at DUMMYNAME.
532 For structs and unions, if the function was compiled with Sun cc,
533 it expects 'unimp' after the call. But gcc doesn't use that
534 (twisted) convention. So leave a nop there for gcc (FIX_CALL_DUMMY
535 can assume it is operating on a pristine CALL_DUMMY, not one that
536 has already been customized for a different function). */
538 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
540 *(int *)((char *) dummyname+168) = (0x40000000|((fun-(pc+168))>>2)); \
542 && (TYPE_CODE (type) == TYPE_CODE_STRUCT \
543 || TYPE_CODE (type) == TYPE_CODE_UNION)) \
544 *(int *)((char *) dummyname+176) = (TYPE_LENGTH (type) & 0x1fff); \
548 /* Sparc has no reliable single step ptrace call */
550 #define NO_SINGLE_STEP 1
551 extern void single_step ();
553 /* We need two arguments (in general) to the "info frame" command.
554 Note that the definition of this macro implies that there exists a
555 function "setup_arbitrary_frame" in sparc-tdep.c */
557 #define FRAME_SPECIFICATION_DYADIC
559 /* To print every pair of float registers as a double, we use this hook. */
561 #define PRINT_REGISTER_HOOK(regno) \
562 if (((regno) >= FP0_REGNUM) \
563 && ((regno) < FP0_REGNUM + 32) \
564 && (0 == (regno & 1))) { \
565 char doublereg[8]; /* two float regs */ \
566 if (!read_relative_register_raw_bytes (i , doublereg ) \
567 && !read_relative_register_raw_bytes (i+1, doublereg+4)) { \
569 print_floating (doublereg, builtin_type_double, stdout); \