1 /* Target machine sub-parameters for SPARC, for GDB, the GNU debugger.
2 This is included by other tm-*.h files to define SPARC cpu-related info.
3 Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
4 Contributed by Michael Tiemann (tiemann@mcc.com)
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #define TARGET_BYTE_ORDER BIG_ENDIAN
24 /* Floating point is IEEE compatible. */
27 /* When passing a structure to a function, Sun cc passes the address
28 not the structure itself. It (under SunOS4) creates two symbols,
29 which we need to combine to a LOC_REGPARM. Gcc version two (as of
30 1.92) behaves like sun cc. REG_STRUCT_HAS_ADDR is smart enough to
31 distinguish between Sun cc, gcc version 1 and gcc version 2.
33 This still doesn't work if the argument is not one passed in a
34 register (i.e. it's the 7th or later argument). */
35 #define REG_STRUCT_HAS_ADDR(gcc_p) (gcc_p != 1)
37 /* If Pcc says that a parameter is a short, it's a short. This is
38 because the parameter does get passed in in a register as an int,
39 but pcc puts it onto the stack frame as a short (not nailing
40 whatever else might be there. I'm not sure that I consider this
43 No, don't do this. The problem here is that pcc says that the
44 argument is in the upper half of the word reserved on the stack,
45 but puts it in the lower half. */
46 /* #define BELIEVE_PCC_PROMOTION 1 */
47 /* OK, I've added code to dbxread.c to deal with this case. */
48 #define BELIEVE_PCC_PROMOTION_TYPE
50 /* For acc, there's no need to correct LBRAC entries by guessing how
51 they should work. In fact, this is harmful because the LBRAC
52 entries now all appear at the end of the function, not intermixed
53 with the SLINE entries. n_opt_found detects acc for Solaris binaries;
54 function_stab_type detects acc for SunOS4 binaries.
56 For binary from SunOS4 /bin/cc, need to correct LBRAC's.
58 For gcc, like acc, don't correct. */
60 #define SUN_FIXED_LBRAC_BUG \
62 || function_stab_type == N_STSYM \
63 || function_stab_type == N_GSYM \
64 || processing_gcc_compilation)
66 /* Do variables in the debug stabs occur after the N_LBRAC or before it?
67 acc: after, gcc: before, SunOS4 /bin/cc: before. */
69 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) \
72 || function_stab_type == N_STSYM \
73 || function_stab_type == N_GSYM))
75 /* Offset from address of function to start of its code.
76 Zero on most machines. */
78 #define FUNCTION_START_OFFSET 0
80 /* Advance PC across any function entry prologue instructions
81 to reach some "real" code. SKIP_PROLOGUE_FRAMELESS_P advances
82 the PC past some of the prologue, but stops as soon as it
83 knows that the function has a frame. Its result is equal
84 to its input PC if the function is frameless, unequal otherwise. */
86 #define SKIP_PROLOGUE(pc) \
87 { pc = skip_prologue (pc, 0); }
88 #define SKIP_PROLOGUE_FRAMELESS_P(pc) \
89 { pc = skip_prologue (pc, 1); }
90 extern CORE_ADDR
skip_prologue ();
92 /* Immediately after a function call, return the saved pc.
93 Can't go through the frames for this because on some machines
94 the new frame is not set up until the new function executes
97 /* On the Sun 4 under SunOS, the compile will leave a fake insn which
98 encodes the structure size being returned. If we detect such
99 a fake insn, step past it. */
101 #define PC_ADJUST(pc) sparc_pc_adjust(pc)
102 extern CORE_ADDR
sparc_pc_adjust();
104 #define SAVED_PC_AFTER_CALL(frame) PC_ADJUST (read_register (RP_REGNUM))
106 /* Stack grows downward. */
110 /* Stack has strict alignment. */
112 #define STACK_ALIGN(ADDR) (((ADDR)+7)&-8)
114 /* Sequence of bytes for breakpoint instruction. */
116 #define BREAKPOINT {0x91, 0xd0, 0x20, 0x01}
118 /* Amount PC must be decremented by after a breakpoint.
119 This is often the number of bytes in BREAKPOINT
122 #define DECR_PC_AFTER_BREAK 0
124 /* Nonzero if instruction at PC is a return instruction. */
125 /* For SPARC, this is either a "jmpl %o7+8,%g0" or "jmpl %i7+8,%g0".
127 Note: this does not work for functions returning structures under SunOS. */
128 #define ABOUT_TO_RETURN(pc) \
129 ((read_memory_integer (pc, 4)|0x00040000) == 0x81c7e008)
131 /* Return 1 if P points to an invalid floating point value. */
133 #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
135 /* Say how long (ordinary) registers are. */
137 #define REGISTER_TYPE long
139 /* Number of machine registers */
143 /* Initializer for an array of names of registers.
144 There should be NUM_REGS strings in this initializer. */
146 #define REGISTER_NAMES \
147 { "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7", \
148 "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7", \
149 "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7", \
150 "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7", \
152 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
153 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
154 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
155 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
157 "y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr" }
159 /* Register numbers of various important registers.
160 Note that some of these values are "real" register numbers,
161 and correspond to the general registers of the machine,
162 and some are "phony" register numbers which are too large
163 to be actual register numbers as far as the user is concerned
164 but do serve to get the desired values when passed to read_register. */
166 #define G0_REGNUM 0 /* %g0 */
167 #define G1_REGNUM 1 /* %g1 */
168 #define O0_REGNUM 8 /* %o0 */
169 #define SP_REGNUM 14 /* Contains address of top of stack, \
170 which is also the bottom of the frame. */
171 #define RP_REGNUM 15 /* Contains return address value, *before* \
172 any windows get switched. */
173 #define O7_REGNUM 15 /* Last local reg not saved on stack frame */
174 #define L0_REGNUM 16 /* First local reg that's saved on stack frame
175 rather than in machine registers */
176 #define I0_REGNUM 24 /* %i0 */
177 #define FP_REGNUM 30 /* Contains address of executing stack frame */
178 #define I7_REGNUM 31 /* Last local reg saved on stack frame */
179 #define FP0_REGNUM 32 /* Floating point register 0 */
180 #define Y_REGNUM 64 /* Temp register for multiplication, etc. */
181 #define PS_REGNUM 65 /* Contains processor status */
182 #define WIM_REGNUM 66 /* Window Invalid Mask (not really supported) */
183 #define TBR_REGNUM 67 /* Trap Base Register (not really supported) */
184 #define PC_REGNUM 68 /* Contains program counter */
185 #define NPC_REGNUM 69 /* Contains next PC */
186 #define FPS_REGNUM 70 /* Floating point status register */
187 #define CPS_REGNUM 71 /* Coprocessor status register */
189 /* Total amount of space needed to store our copies of the machine's
190 register state, the array `registers'. On the sparc, `registers'
191 contains the ins and locals, even though they are saved on the
192 stack rather than with the other registers, and this causes hair
193 and confusion in places like pop_frame. It probably would be
194 better to remove the ins and locals from `registers', make sure
195 that get_saved_register can get them from the stack (even in the
196 innermost frame), and make this the way to access them. For the
197 frame pointer we would do that via TARGET_READ_FP. */
199 #define REGISTER_BYTES (32*4+32*4+8*4)
201 /* Index within `registers' of the first byte of the space for
204 #define REGISTER_BYTE(N) ((N)*4)
206 /* The SPARC processor has register windows. */
208 #define HAVE_REGISTER_WINDOWS
210 /* Is this register part of the register window system? A yes answer
211 implies that 1) The name of this register will not be the same in
212 other frames, and 2) This register is automatically "saved" (out
213 registers shifting into ins counts) upon subroutine calls and thus
214 there is no need to search more than one stack frame for it. */
216 #define REGISTER_IN_WINDOW_P(regnum) \
217 ((regnum) >= 8 && (regnum) < 32)
219 /* Number of bytes of storage in the actual machine representation
222 /* On the SPARC, all regs are 4 bytes. */
224 #define REGISTER_RAW_SIZE(N) (4)
226 /* Number of bytes of storage in the program's representation
229 /* On the SPARC, all regs are 4 bytes. */
231 #define REGISTER_VIRTUAL_SIZE(N) (4)
233 /* Largest value REGISTER_RAW_SIZE can have. */
235 #define MAX_REGISTER_RAW_SIZE 8
237 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
239 #define MAX_REGISTER_VIRTUAL_SIZE 8
241 /* Nonzero if register N requires conversion
242 from raw format to virtual format. */
244 #define REGISTER_CONVERTIBLE(N) (0)
246 /* Convert data from raw format for register REGNUM
247 to virtual format for register REGNUM. */
249 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
250 { memcpy ((TO), (FROM), REGISTER_RAW_SIZE (REGNUM)); }
252 /* Convert data from virtual format for register REGNUM
253 to raw format for register REGNUM. */
255 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
256 { memcpy ((TO), (FROM), REGISTER_RAW_SIZE (REGNUM)); }
258 /* Return the GDB type object for the "standard" data type
259 of data in register N. */
261 #define REGISTER_VIRTUAL_TYPE(N) \
262 ((N) < 32 ? builtin_type_int : (N) < 64 ? builtin_type_float : \
265 /* Writing to %g0 is a noop (not an error or exception or anything like
268 #define CANNOT_STORE_REGISTER(regno) ((regno) == G0_REGNUM)
270 /* Store the address of the place in which to copy the structure the
271 subroutine will return. This is called from call_function. */
273 #define STORE_STRUCT_RETURN(ADDR, SP) \
274 { target_write_memory ((SP)+(16*4), (char *)&(ADDR), 4); }
276 /* Extract from an array REGBUF containing the (raw) register state
277 a function return value of type TYPE, and copy that, in virtual format,
280 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
282 if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
284 memcpy ((VALBUF), ((int *)(REGBUF))+FP0_REGNUM, TYPE_LENGTH(TYPE));\
288 (char *)(REGBUF) + 4 * 8 + \
289 (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)), \
290 TYPE_LENGTH(TYPE)); \
293 /* Write into appropriate registers a function return value
294 of type TYPE, given in virtual format. */
295 /* On sparc, values are returned in register %o0. */
296 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
298 if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
299 /* Floating-point values are returned in the register pair */ \
300 /* formed by %f0 and %f1 (doubles are, anyway). */ \
301 write_register_bytes (REGISTER_BYTE (FP0_REGNUM), (VALBUF), \
302 TYPE_LENGTH (TYPE)); \
304 /* Other values are returned in register %o0. */ \
305 write_register_bytes (REGISTER_BYTE (O0_REGNUM), (VALBUF), \
306 TYPE_LENGTH (TYPE)); \
309 /* Extract from an array REGBUF containing the (raw) register state
310 the address in which a function should return its structure value,
311 as a CORE_ADDR (or an expression that can be used as one). */
313 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
314 (sparc_extract_struct_value_address (REGBUF))
317 sparc_extract_struct_value_address
PARAMS ((char [REGISTER_BYTES
]));
320 /* Describe the pointer in each stack frame to the previous stack frame
323 /* FRAME_CHAIN takes a frame's nominal address
324 and produces the frame's chain-pointer. */
326 /* In the case of the Sun 4, the frame-chain's nominal address
327 is held in the frame pointer register.
329 On the Sun4, the frame (in %fp) is %sp for the previous frame.
330 From the previous frame's %sp, we can find the previous frame's
331 %fp: it is in the save area just above the previous frame's %sp.
333 If we are setting up an arbitrary frame, we'll need to know where
334 it ends. Hence the following. This part of the frame cache
335 structure should be checked before it is assumed that this frame's
336 bottom is in the stack pointer.
338 If there isn't a frame below this one, the bottom of this frame is
339 in the stack pointer.
341 If there is a frame below this one, and the frame pointers are
342 identical, it's a leaf frame and the bottoms are the same also.
344 Otherwise the bottom of this frame is the top of the next frame.
346 The bottom field is misnamed, since it might imply that memory from
347 bottom to frame contains this frame. That need not be true if
348 stack frames are allocated in different segments (e.g. some on a
349 stack, some on a heap in the data segment). */
351 #define EXTRA_FRAME_INFO FRAME_ADDR bottom;
352 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
355 ((fci)->frame == (fci)->next->frame ? \
356 (fci)->next->bottom : (fci)->next->frame) : \
357 read_register (SP_REGNUM));
359 #define FRAME_CHAIN(thisframe) (sparc_frame_chain (thisframe))
360 CORE_ADDR
sparc_frame_chain ();
362 /* Define other aspects of the stack frame. */
364 /* A macro that tells us whether the function invocation represented
365 by FI does not have a frame on the stack associated with it. If it
366 does not, FRAMELESS is set to 1, else 0. */
367 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
368 (FRAMELESS) = frameless_look_for_prologue(FI)
370 /* Where is the PC for a specific frame */
372 #define FRAME_SAVED_PC(FRAME) frame_saved_pc (FRAME)
373 CORE_ADDR
frame_saved_pc ();
375 /* If the argument is on the stack, it will be here. */
376 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
378 #define FRAME_STRUCT_ARGS_ADDRESS(fi) ((fi)->frame)
380 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
382 /* Set VAL to the number of args passed to frame described by FI.
383 Can set VAL to -1, meaning no way to tell. */
385 /* We can't tell how many args there are
386 now that the C compiler delays popping them. */
387 #define FRAME_NUM_ARGS(val,fi) (val = -1)
389 /* Return number of bytes at start of arglist that are not really args. */
391 #define FRAME_ARGS_SKIP 68
393 /* Put here the code to store, into a struct frame_saved_regs,
394 the addresses of the saved registers of frame described by FRAME_INFO.
395 The actual code is in sparc-tdep.c so we can debug it sanely. */
397 #define FRAME_FIND_SAVED_REGS(fi, frame_saved_regs) \
398 sparc_frame_find_saved_regs ((fi), &(frame_saved_regs))
399 extern void sparc_frame_find_saved_regs ();
401 /* Things needed for making the inferior call functions. */
403 * First of all, let me give my opinion of what the DUMMY_FRAME
404 * actually looks like.
408 * + - - - - - - - - - - - - - - - - +<-- fp (level 0)
413 * | Frame of innermost program |
420 * |---------------------------------|<-- sp (level 0), fp (c)
424 * | ------ |<-- fp - 0x80
425 * FRAME | g0-7 |<-- fp - 0xa0
426 * | i0-7 |<-- fp - 0xc0
427 * | other |<-- fp - 0xe0
430 * |---------------------------------|<-- sp' = fp - 0x140
433 * sp' + 0x94 -->| CALL_DUMMY (x code) |
436 * |---------------------------------|<-- sp'' = fp - 0x200
437 * | align sp to 8 byte boundary |
438 * | ==> args to fn <== |
440 * i & l's + agg | CALL_DUMMY_STACK_ADJUST = 0x0x44|
441 * |---------------------------------|<-- final sp (variable)
443 * | Where function called will |
448 * I understand everything in this picture except what the space
449 * between fp - 0xe0 and fp - 0x140 is used for. Oh, and I don't
450 * understand why there's a large chunk of CALL_DUMMY that never gets
451 * executed (its function is superceeded by PUSH_DUMMY_FRAME; they
452 * are designed to do the same thing).
454 * PUSH_DUMMY_FRAME saves the registers above sp' and pushes the
455 * register file stack down one.
457 * call_function then writes CALL_DUMMY, pushes the args onto the
458 * stack, and adjusts the stack pointer.
460 * run_stack_dummy then starts execution (in the middle of
461 * CALL_DUMMY, as directed by call_function).
464 /* Push an empty stack frame, to record the current PC, etc. */
466 #define PUSH_DUMMY_FRAME sparc_push_dummy_frame ()
467 #define POP_FRAME sparc_pop_frame ()
469 void sparc_push_dummy_frame (), sparc_pop_frame ();
470 /* This sequence of words is the instructions
497 nop ! stcsr [%fp-0xc4]
498 nop ! stfsr [%fp-0xc8]
499 nop ! wr %npc,[%fp-0xcc]
500 nop ! wr %pc,[%fp-0xd0]
510 /..* The arguments are pushed at this point by GDB;
511 no code is needed in the dummy for this.
512 The CALL_DUMMY_START_OFFSET gives the position of
513 the following ld instruction. *../
526 note that this is 192 bytes, which is a multiple of 8 (not only 4) bytes.
527 note that the `call' insn is a relative, not an absolute call.
528 note that the `nop' at the end is needed to keep the trap from
529 clobbering things (if NPC pointed to garbage instead).
531 We actually start executing at the `sethi', since the pushing of the
532 registers (as arguments) is done by PUSH_DUMMY_FRAME. If this were
533 real code, the arguments for the function called by the CALL would be
534 pushed between the list of ST insns and the CALL, and we could allow
535 it to execute through. But the arguments have to be pushed by GDB
536 after the PUSH_DUMMY_FRAME is done, and we cannot allow these ST
537 insns to be performed again, lest the registers saved be taken for
540 #define CALL_DUMMY { 0x9de3bee0, 0xfd3fbff8, 0xf93fbff0, 0xf53fbfe8, \
541 0xf13fbfe0, 0xed3fbfd8, 0xe93fbfd0, 0xe53fbfc8, \
542 0xe13fbfc0, 0xdd3fbfb8, 0xd93fbfb0, 0xd53fbfa8, \
543 0xd13fbfa0, 0xcd3fbf98, 0xc93fbf90, 0xc53fbf88, \
544 0xc13fbf80, 0xcc3fbf78, 0xc83fbf70, 0xc43fbf68, \
545 0xc03fbf60, 0xfc3fbf58, 0xf83fbf50, 0xf43fbf48, \
546 0xf03fbf40, 0x01000000, 0x01000000, 0x01000000, \
547 0x01000000, 0x91580000, 0xd027bf50, 0x93500000, \
548 0xd027bf4c, 0x91480000, 0xd027bf48, 0x91400000, \
549 0xd027bf44, 0xda03a058, 0xd803a054, 0xd603a050, \
550 0xd403a04c, 0xd203a048, 0x40000000, 0xd003a044, \
551 0x01000000, 0x91d02001, 0x01000000, 0x01000000}
553 #define CALL_DUMMY_LENGTH 192
555 #define CALL_DUMMY_START_OFFSET 148
557 #define CALL_DUMMY_STACK_ADJUST 68
559 /* Insert the specified number of args and function address
560 into a call sequence of the above form stored at DUMMYNAME.
562 For structs and unions, if the function was compiled with Sun cc,
563 it expects 'unimp' after the call. But gcc doesn't use that
564 (twisted) convention. So leave a nop there for gcc (FIX_CALL_DUMMY
565 can assume it is operating on a pristine CALL_DUMMY, not one that
566 has already been customized for a different function). */
568 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
570 *(int *)((char *) dummyname+168) = (0x40000000|((fun-(pc+168))>>2)); \
572 && (TYPE_CODE (type) == TYPE_CODE_STRUCT \
573 || TYPE_CODE (type) == TYPE_CODE_UNION)) \
574 *(int *)((char *) dummyname+176) = (TYPE_LENGTH (type) & 0x1fff); \
578 /* Sparc has no reliable single step ptrace call */
580 #define NO_SINGLE_STEP 1
581 extern void single_step ();
583 /* We need more arguments in a frame specification for the
584 "frame" or "info frame" command. */
586 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
587 /* FIXME: Depends on equivalence between FRAME and "struct frame_info *",
588 and equivalence between CORE_ADDR and FRAME_ADDR. */
589 extern struct frame_info
*setup_arbitrary_frame
PARAMS ((int, CORE_ADDR
*));
591 /* To print every pair of float registers as a double, we use this hook. */
593 #define PRINT_REGISTER_HOOK(regno) \
594 if (((regno) >= FP0_REGNUM) \
595 && ((regno) < FP0_REGNUM + 32) \
596 && (0 == ((regno) & 1))) { \
597 char doublereg[8]; /* two float regs */ \
598 if (!read_relative_register_raw_bytes ((regno) , doublereg ) \
599 && !read_relative_register_raw_bytes ((regno)+1, doublereg+4)) { \
601 print_floating (doublereg, builtin_type_double, stdout); \
605 /* Optimization for storing registers to the inferior. The hook
607 actually executes any deferred stores. It is called any time
608 we are going to proceed the child, or read its registers.
609 The hook CLEAR_DEFERRED_STORES is called when we want to throw
610 away the inferior process, e.g. when it dies or we kill it.
611 FIXME, this does not handle remote debugging cleanly. */
613 extern int deferred_stores
;
614 #define DO_DEFERRED_STORES \
615 if (deferred_stores) \
616 target_store_registers (-2);
617 #define CLEAR_DEFERRED_STORES \