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, 1994
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@mcc.com)
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
23 #define TARGET_BYTE_ORDER BIG_ENDIAN
25 /* Floating point is IEEE compatible. */
28 /* If an argument is declared "register", Sun cc will keep it in a register,
29 never saving it onto the stack. So we better not believe the "p" symbol
32 #define USE_REGISTER_NOT_ARG
34 /* When passing a structure to a function, Sun cc passes the address
35 not the structure itself. It (under SunOS4) creates two symbols,
36 which we need to combine to a LOC_REGPARM. Gcc version two (as of
37 1.92) behaves like sun cc. REG_STRUCT_HAS_ADDR is smart enough to
38 distinguish between Sun cc, gcc version 1 and gcc version 2. */
40 #define REG_STRUCT_HAS_ADDR(gcc_p,type) (gcc_p != 1)
42 /* Sun /bin/cc gets this right as of SunOS 4.1.x. We need to define
43 BELIEVE_PCC_PROMOTION to get this right now that the code which
44 detects gcc2_compiled. is broken. This loses for SunOS 4.0.x and
47 #define BELIEVE_PCC_PROMOTION 1
49 /* For acc, there's no need to correct LBRAC entries by guessing how
50 they should work. In fact, this is harmful because the LBRAC
51 entries now all appear at the end of the function, not intermixed
52 with the SLINE entries. n_opt_found detects acc for Solaris binaries;
53 function_stab_type detects acc for SunOS4 binaries.
55 For binary from SunOS4 /bin/cc, need to correct LBRAC's.
57 For gcc, like acc, don't correct. */
59 #define SUN_FIXED_LBRAC_BUG \
61 || function_stab_type == N_STSYM \
62 || function_stab_type == N_GSYM \
63 || processing_gcc_compilation)
65 /* Do variables in the debug stabs occur after the N_LBRAC or before it?
66 acc: after, gcc: before, SunOS4 /bin/cc: before. */
68 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) \
71 || function_stab_type == N_STSYM \
72 || function_stab_type == N_GSYM))
74 /* Offset from address of function to start of its code.
75 Zero on most machines. */
77 #define FUNCTION_START_OFFSET 0
79 /* Advance PC across any function entry prologue instructions
80 to reach some "real" code. SKIP_PROLOGUE_FRAMELESS_P advances
81 the PC past some of the prologue, but stops as soon as it
82 knows that the function has a frame. Its result is equal
83 to its input PC if the function is frameless, unequal otherwise. */
85 #define SKIP_PROLOGUE(pc) \
86 { pc = skip_prologue (pc, 0); }
87 #define SKIP_PROLOGUE_FRAMELESS_P(pc) \
88 { pc = skip_prologue (pc, 1); }
89 extern CORE_ADDR skip_prologue
PARAMS ((CORE_ADDR
, int));
91 /* Immediately after a function call, return the saved pc.
92 Can't go through the frames for this because on some machines
93 the new frame is not set up until the new function executes
96 /* On the Sun 4 under SunOS, the compile will leave a fake insn which
97 encodes the structure size being returned. If we detect such
98 a fake insn, step past it. */
100 #define PC_ADJUST(pc) sparc_pc_adjust(pc)
101 extern CORE_ADDR sparc_pc_adjust
PARAMS ((CORE_ADDR
));
103 #define SAVED_PC_AFTER_CALL(frame) PC_ADJUST (read_register (RP_REGNUM))
105 /* Stack grows downward. */
109 /* Stack has strict alignment. */
111 #define STACK_ALIGN(ADDR) (((ADDR)+7)&-8)
113 /* Sequence of bytes for breakpoint instruction. */
115 #define BREAKPOINT {0x91, 0xd0, 0x20, 0x01}
117 /* Amount PC must be decremented by after a breakpoint.
118 This is often the number of bytes in BREAKPOINT
121 #define DECR_PC_AFTER_BREAK 0
123 /* Nonzero if instruction at PC is a return instruction. */
124 /* For SPARC, this is either a "jmpl %o7+8,%g0" or "jmpl %i7+8,%g0".
126 Note: this does not work for functions returning structures under SunOS. */
127 #define ABOUT_TO_RETURN(pc) \
128 ((read_memory_integer (pc, 4)|0x00040000) == 0x81c7e008)
130 /* Say how long (ordinary) registers are. This is a piece of bogosity
131 used in push_word and a few other places; REGISTER_RAW_SIZE is the
132 real way to know how big a register is. */
134 #define REGISTER_SIZE 4
136 /* Number of machine registers */
140 /* Initializer for an array of names of registers.
141 There should be NUM_REGS strings in this initializer. */
143 #define REGISTER_NAMES \
144 { "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7", \
145 "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7", \
146 "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7", \
147 "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7", \
149 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
150 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
151 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
152 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
154 "y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr" }
156 /* Register numbers of various important registers.
157 Note that some of these values are "real" register numbers,
158 and correspond to the general registers of the machine,
159 and some are "phony" register numbers which are too large
160 to be actual register numbers as far as the user is concerned
161 but do serve to get the desired values when passed to read_register. */
163 #define G0_REGNUM 0 /* %g0 */
164 #define G1_REGNUM 1 /* %g1 */
165 #define O0_REGNUM 8 /* %o0 */
166 #define SP_REGNUM 14 /* Contains address of top of stack, \
167 which is also the bottom of the frame. */
168 #define RP_REGNUM 15 /* Contains return address value, *before* \
169 any windows get switched. */
170 #define O7_REGNUM 15 /* Last local reg not saved on stack frame */
171 #define L0_REGNUM 16 /* First local reg that's saved on stack frame
172 rather than in machine registers */
173 #define I0_REGNUM 24 /* %i0 */
174 #define FP_REGNUM 30 /* Contains address of executing stack frame */
175 #define I7_REGNUM 31 /* Last local reg saved on stack frame */
176 #define FP0_REGNUM 32 /* Floating point register 0 */
177 #define Y_REGNUM 64 /* Temp register for multiplication, etc. */
178 #define PS_REGNUM 65 /* Contains processor status */
179 #define WIM_REGNUM 66 /* Window Invalid Mask (not really supported) */
180 #define TBR_REGNUM 67 /* Trap Base Register (not really supported) */
181 #define PC_REGNUM 68 /* Contains program counter */
182 #define NPC_REGNUM 69 /* Contains next PC */
183 #define FPS_REGNUM 70 /* Floating point status register */
184 #define CPS_REGNUM 71 /* Coprocessor status register */
186 /* Total amount of space needed to store our copies of the machine's
187 register state, the array `registers'. On the sparc, `registers'
188 contains the ins and locals, even though they are saved on the
189 stack rather than with the other registers, and this causes hair
190 and confusion in places like pop_frame. It probably would be
191 better to remove the ins and locals from `registers', make sure
192 that get_saved_register can get them from the stack (even in the
193 innermost frame), and make this the way to access them. For the
194 frame pointer we would do that via TARGET_READ_FP. */
196 #define REGISTER_BYTES (32*4+32*4+8*4)
198 /* Index within `registers' of the first byte of the space for
201 #define REGISTER_BYTE(N) ((N)*4)
203 /* The SPARC processor has register windows. */
205 #define HAVE_REGISTER_WINDOWS
207 /* Is this register part of the register window system? A yes answer
208 implies that 1) The name of this register will not be the same in
209 other frames, and 2) This register is automatically "saved" (out
210 registers shifting into ins counts) upon subroutine calls and thus
211 there is no need to search more than one stack frame for it. */
213 #define REGISTER_IN_WINDOW_P(regnum) \
214 ((regnum) >= 8 && (regnum) < 32)
216 /* Number of bytes of storage in the actual machine representation
219 /* On the SPARC, all regs are 4 bytes. */
221 #define REGISTER_RAW_SIZE(N) (4)
223 /* Number of bytes of storage in the program's representation
226 /* On the SPARC, all regs are 4 bytes. */
228 #define REGISTER_VIRTUAL_SIZE(N) (4)
230 /* Largest value REGISTER_RAW_SIZE can have. */
232 #define MAX_REGISTER_RAW_SIZE 8
234 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
236 #define MAX_REGISTER_VIRTUAL_SIZE 8
238 /* Return the GDB type object for the "standard" data type
239 of data in register N. */
241 #define REGISTER_VIRTUAL_TYPE(N) \
242 ((N) < 32 ? builtin_type_int : (N) < 64 ? builtin_type_float : \
245 /* Writing to %g0 is a noop (not an error or exception or anything like
248 #define CANNOT_STORE_REGISTER(regno) ((regno) == G0_REGNUM)
250 /* Store the address of the place in which to copy the structure the
251 subroutine will return. This is called from call_function. */
253 #define STORE_STRUCT_RETURN(ADDR, SP) \
254 { target_write_memory ((SP)+(16*4), (char *)&(ADDR), 4); }
256 /* Extract from an array REGBUF containing the (raw) register state
257 a function return value of type TYPE, and copy that, in virtual format,
260 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
262 if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
264 memcpy ((VALBUF), ((int *)(REGBUF))+FP0_REGNUM, TYPE_LENGTH(TYPE));\
268 (char *)(REGBUF) + 4 * 8 + \
269 (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)), \
270 TYPE_LENGTH(TYPE)); \
273 /* Write into appropriate registers a function return value
274 of type TYPE, given in virtual format. */
275 /* On sparc, values are returned in register %o0. */
276 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
278 if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
279 /* Floating-point values are returned in the register pair */ \
280 /* formed by %f0 and %f1 (doubles are, anyway). */ \
281 write_register_bytes (REGISTER_BYTE (FP0_REGNUM), (VALBUF), \
282 TYPE_LENGTH (TYPE)); \
284 /* Other values are returned in register %o0. */ \
285 write_register_bytes (REGISTER_BYTE (O0_REGNUM), (VALBUF), \
286 TYPE_LENGTH (TYPE)); \
289 /* Extract from an array REGBUF containing the (raw) register state
290 the address in which a function should return its structure value,
291 as a CORE_ADDR (or an expression that can be used as one). */
293 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
294 (sparc_extract_struct_value_address (REGBUF))
297 sparc_extract_struct_value_address
PARAMS ((char [REGISTER_BYTES
]));
300 /* Describe the pointer in each stack frame to the previous stack frame
303 /* FRAME_CHAIN takes a frame's nominal address
304 and produces the frame's chain-pointer. */
306 /* In the case of the Sun 4, the frame-chain's nominal address
307 is held in the frame pointer register.
309 On the Sun4, the frame (in %fp) is %sp for the previous frame.
310 From the previous frame's %sp, we can find the previous frame's
311 %fp: it is in the save area just above the previous frame's %sp.
313 If we are setting up an arbitrary frame, we'll need to know where
314 it ends. Hence the following. This part of the frame cache
315 structure should be checked before it is assumed that this frame's
316 bottom is in the stack pointer.
318 If there isn't a frame below this one, the bottom of this frame is
319 in the stack pointer.
321 If there is a frame below this one, and the frame pointers are
322 identical, it's a leaf frame and the bottoms are the same also.
324 Otherwise the bottom of this frame is the top of the next frame.
326 The bottom field is misnamed, since it might imply that memory from
327 bottom to frame contains this frame. That need not be true if
328 stack frames are allocated in different segments (e.g. some on a
329 stack, some on a heap in the data segment).
331 GCC 2.6 and later can generate ``flat register window'' code that
332 makes frames by explicitly saving those registers that need to be
333 saved. %i7 is used as the frame pointer, and the frame is laid out so
334 that flat and non-flat calls can be intermixed freely within a
335 program. Unfortunately for GDB, this means it must detect and record
336 the flatness of frames.
338 Since the prologue in a flat frame also tells us where fp and pc
339 have been stashed (the frame is of variable size, so their location
340 is not fixed), it's convenient to record them in the frame info. */
342 #define EXTRA_FRAME_INFO \
348 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
349 sparc_init_extra_frame_info (fromleaf, fci)
350 extern void sparc_init_extra_frame_info ();
352 #define PRINT_EXTRA_FRAME_INFO(fi) \
354 if ((fi) && (fi)->flat) \
355 printf_filtered (" flat, pc saved at 0x%x, fp saved at 0x%x\n", \
356 (fi)->pc_addr, (fi)->fp_addr); \
359 #define FRAME_CHAIN(thisframe) (sparc_frame_chain (thisframe))
360 extern 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 /* The location of I0 w.r.t SP. This is actually dependent on how the system's
371 window overflow/underflow routines are written. Most vendors save the L regs
372 followed by the I regs (at the higher address). Some vendors get it wrong.
375 #define FRAME_SAVED_L0 0
376 #define FRAME_SAVED_I0 (8 * REGISTER_RAW_SIZE (L0_REGNUM))
378 /* Where is the PC for a specific frame */
380 #define FRAME_SAVED_PC(FRAME) sparc_frame_saved_pc (FRAME)
381 extern CORE_ADDR
sparc_frame_saved_pc ();
383 /* If the argument is on the stack, it will be here. */
384 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
386 #define FRAME_STRUCT_ARGS_ADDRESS(fi) ((fi)->frame)
388 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
390 /* Set VAL to the number of args passed to frame described by FI.
391 Can set VAL to -1, meaning no way to tell. */
393 /* We can't tell how many args there are
394 now that the C compiler delays popping them. */
395 #define FRAME_NUM_ARGS(val,fi) (val = -1)
397 /* Return number of bytes at start of arglist that are not really args. */
399 #define FRAME_ARGS_SKIP 68
401 /* Put here the code to store, into a struct frame_saved_regs,
402 the addresses of the saved registers of frame described by FRAME_INFO.
403 The actual code is in sparc-tdep.c so we can debug it sanely. */
405 #define FRAME_FIND_SAVED_REGS(fi, frame_saved_regs) \
406 sparc_frame_find_saved_regs ((fi), &(frame_saved_regs))
409 struct frame_saved_regs
;
411 extern void sparc_frame_find_saved_regs
PARAMS ((struct frame_info
*,
412 struct frame_saved_regs
*));
414 /* Things needed for making the inferior call functions. */
416 * First of all, let me give my opinion of what the DUMMY_FRAME
417 * actually looks like.
421 * + - - - - - - - - - - - - - - - - +<-- fp (level 0)
426 * | Frame of innermost program |
433 * |---------------------------------|<-- sp (level 0), fp (c)
437 * | ------ |<-- fp - 0x80
438 * FRAME | g0-7 |<-- fp - 0xa0
439 * | i0-7 |<-- fp - 0xc0
440 * | other |<-- fp - 0xe0
443 * |---------------------------------|<-- sp' = fp - 0x140
446 * sp' + 0x94 -->| CALL_DUMMY (x code) |
449 * |---------------------------------|<-- sp'' = fp - 0x200
450 * | align sp to 8 byte boundary |
451 * | ==> args to fn <== |
453 * i & l's + agg | CALL_DUMMY_STACK_ADJUST = 0x0x44|
454 * |---------------------------------|<-- final sp (variable)
456 * | Where function called will |
461 * I understand everything in this picture except what the space
462 * between fp - 0xe0 and fp - 0x140 is used for. Oh, and I don't
463 * understand why there's a large chunk of CALL_DUMMY that never gets
464 * executed (its function is superceeded by PUSH_DUMMY_FRAME; they
465 * are designed to do the same thing).
467 * PUSH_DUMMY_FRAME saves the registers above sp' and pushes the
468 * register file stack down one.
470 * call_function then writes CALL_DUMMY, pushes the args onto the
471 * stack, and adjusts the stack pointer.
473 * run_stack_dummy then starts execution (in the middle of
474 * CALL_DUMMY, as directed by call_function).
477 /* Push an empty stack frame, to record the current PC, etc. */
479 #define PUSH_DUMMY_FRAME sparc_push_dummy_frame ()
480 #define POP_FRAME sparc_pop_frame ()
482 void sparc_push_dummy_frame (), sparc_pop_frame ();
483 /* This sequence of words is the instructions
510 nop ! stcsr [%fp-0xc4]
511 nop ! stfsr [%fp-0xc8]
512 nop ! wr %npc,[%fp-0xcc]
513 nop ! wr %pc,[%fp-0xd0]
523 /..* The arguments are pushed at this point by GDB;
524 no code is needed in the dummy for this.
525 The CALL_DUMMY_START_OFFSET gives the position of
526 the following ld instruction. *../
539 note that this is 192 bytes, which is a multiple of 8 (not only 4) bytes.
540 note that the `call' insn is a relative, not an absolute call.
541 note that the `nop' at the end is needed to keep the trap from
542 clobbering things (if NPC pointed to garbage instead).
544 We actually start executing at the `sethi', since the pushing of the
545 registers (as arguments) is done by PUSH_DUMMY_FRAME. If this were
546 real code, the arguments for the function called by the CALL would be
547 pushed between the list of ST insns and the CALL, and we could allow
548 it to execute through. But the arguments have to be pushed by GDB
549 after the PUSH_DUMMY_FRAME is done, and we cannot allow these ST
550 insns to be performed again, lest the registers saved be taken for
553 #define CALL_DUMMY { 0x9de3bee0, 0xfd3fbff8, 0xf93fbff0, 0xf53fbfe8, \
554 0xf13fbfe0, 0xed3fbfd8, 0xe93fbfd0, 0xe53fbfc8, \
555 0xe13fbfc0, 0xdd3fbfb8, 0xd93fbfb0, 0xd53fbfa8, \
556 0xd13fbfa0, 0xcd3fbf98, 0xc93fbf90, 0xc53fbf88, \
557 0xc13fbf80, 0xcc3fbf78, 0xc83fbf70, 0xc43fbf68, \
558 0xc03fbf60, 0xfc3fbf58, 0xf83fbf50, 0xf43fbf48, \
559 0xf03fbf40, 0x01000000, 0x01000000, 0x01000000, \
560 0x01000000, 0x91580000, 0xd027bf50, 0x93500000, \
561 0xd027bf4c, 0x91480000, 0xd027bf48, 0x91400000, \
562 0xd027bf44, 0xda03a058, 0xd803a054, 0xd603a050, \
563 0xd403a04c, 0xd203a048, 0x40000000, 0xd003a044, \
564 0x01000000, 0x91d02001, 0x01000000, 0x01000000}
566 #define CALL_DUMMY_LENGTH 192
568 #define CALL_DUMMY_START_OFFSET 148
570 #define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + (8 * 4))
572 #define CALL_DUMMY_STACK_ADJUST 68
574 /* Insert the specified number of args and function address
575 into a call sequence of the above form stored at DUMMYNAME.
577 For structs and unions, if the function was compiled with Sun cc,
578 it expects 'unimp' after the call. But gcc doesn't use that
579 (twisted) convention. So leave a nop there for gcc (FIX_CALL_DUMMY
580 can assume it is operating on a pristine CALL_DUMMY, not one that
581 has already been customized for a different function). */
583 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
585 *(int *)((char *) dummyname+168) = (0x40000000|((fun-(pc+168))>>2)); \
587 && (TYPE_CODE (type) == TYPE_CODE_STRUCT \
588 || TYPE_CODE (type) == TYPE_CODE_UNION)) \
589 *(int *)((char *) dummyname+176) = (TYPE_LENGTH (type) & 0x1fff); \
593 /* Sparc has no reliable single step ptrace call */
595 #define NO_SINGLE_STEP 1
596 extern void single_step
PARAMS ((int));
598 /* We need more arguments in a frame specification for the
599 "frame" or "info frame" command. */
601 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
602 extern struct frame_info
*setup_arbitrary_frame
PARAMS ((int, CORE_ADDR
*));
604 /* To print every pair of float registers as a double, we use this hook. */
606 #define PRINT_REGISTER_HOOK(regno) \
607 if (((regno) >= FP0_REGNUM) \
608 && ((regno) < FP0_REGNUM + 32) \
609 && (0 == ((regno) & 1))) { \
610 char doublereg[8]; /* two float regs */ \
611 if (!read_relative_register_raw_bytes ((regno) , doublereg ) \
612 && !read_relative_register_raw_bytes ((regno)+1, doublereg+4)) { \
614 print_floating (doublereg, builtin_type_double, stdout); \
618 /* Optimization for storing registers to the inferior. The hook
620 actually executes any deferred stores. It is called any time
621 we are going to proceed the child, or read its registers.
622 The hook CLEAR_DEFERRED_STORES is called when we want to throw
623 away the inferior process, e.g. when it dies or we kill it.
624 FIXME, this does not handle remote debugging cleanly. */
626 extern int deferred_stores
;
627 #define DO_DEFERRED_STORES \
628 if (deferred_stores) \
629 target_store_registers (-2);
630 #define CLEAR_DEFERRED_STORES \