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., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
28 #define TARGET_BYTE_ORDER BIG_ENDIAN
30 /* Floating point is IEEE compatible. */
33 /* If an argument is declared "register", Sun cc will keep it in a register,
34 never saving it onto the stack. So we better not believe the "p" symbol
37 #define USE_REGISTER_NOT_ARG
39 /* When passing a structure to a function, Sun cc passes the address
40 not the structure itself. It (under SunOS4) creates two symbols,
41 which we need to combine to a LOC_REGPARM. Gcc version two (as of
42 1.92) behaves like sun cc. REG_STRUCT_HAS_ADDR is smart enough to
43 distinguish between Sun cc, gcc version 1 and gcc version 2. */
45 #define REG_STRUCT_HAS_ADDR(gcc_p,type) (gcc_p != 1)
47 /* Sun /bin/cc gets this right as of SunOS 4.1.x. We need to define
48 BELIEVE_PCC_PROMOTION to get this right now that the code which
49 detects gcc2_compiled. is broken. This loses for SunOS 4.0.x and
52 #define BELIEVE_PCC_PROMOTION 1
54 /* For acc, there's no need to correct LBRAC entries by guessing how
55 they should work. In fact, this is harmful because the LBRAC
56 entries now all appear at the end of the function, not intermixed
57 with the SLINE entries. n_opt_found detects acc for Solaris binaries;
58 function_stab_type detects acc for SunOS4 binaries.
60 For binary from SunOS4 /bin/cc, need to correct LBRAC's.
62 For gcc, like acc, don't correct. */
64 #define SUN_FIXED_LBRAC_BUG \
66 || function_stab_type == N_STSYM \
67 || function_stab_type == N_GSYM \
68 || processing_gcc_compilation)
70 /* Do variables in the debug stabs occur after the N_LBRAC or before it?
71 acc: after, gcc: before, SunOS4 /bin/cc: before. */
73 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) \
76 || function_stab_type == N_STSYM \
77 || function_stab_type == N_GSYM))
79 /* Offset from address of function to start of its code.
80 Zero on most machines. */
82 #define FUNCTION_START_OFFSET 0
84 /* Advance PC across any function entry prologue instructions
85 to reach some "real" code. SKIP_PROLOGUE_FRAMELESS_P advances
86 the PC past some of the prologue, but stops as soon as it
87 knows that the function has a frame. Its result is equal
88 to its input PC if the function is frameless, unequal otherwise. */
90 #define SKIP_PROLOGUE(pc) (sparc_skip_prologue (pc, 0))
91 #define SKIP_PROLOGUE_FRAMELESS_P(pc) (sparc_skip_prologue (pc, 1))
92 extern CORE_ADDR sparc_skip_prologue
PARAMS ((CORE_ADDR
, int));
94 /* Immediately after a function call, return the saved pc.
95 Can't go through the frames for this because on some machines
96 the new frame is not set up until the new function executes
99 /* On the Sun 4 under SunOS, the compile will leave a fake insn which
100 encodes the structure size being returned. If we detect such
101 a fake insn, step past it. */
103 #define PC_ADJUST(pc) sparc_pc_adjust(pc)
104 extern CORE_ADDR sparc_pc_adjust
PARAMS ((CORE_ADDR
));
106 #define SAVED_PC_AFTER_CALL(frame) PC_ADJUST (read_register (RP_REGNUM))
108 /* Stack grows downward. */
110 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
112 /* Stack must be aligned on 64-bit boundaries when synthesizing
115 #define STACK_ALIGN(ADDR) (((ADDR) + 7) & -8)
117 /* Sequence of bytes for breakpoint instruction (ta 1). */
119 #define BREAKPOINT {0x91, 0xd0, 0x20, 0x01}
121 /* Amount PC must be decremented by after a breakpoint.
122 This is often the number of bytes in BREAKPOINT
125 #define DECR_PC_AFTER_BREAK 0
127 /* Say how long (ordinary) registers are. This is a piece of bogosity
128 used in push_word and a few other places; REGISTER_RAW_SIZE is the
129 real way to know how big a register is. */
131 #define REGISTER_SIZE 4
133 /* Number of machine registers */
137 /* Initializer for an array of names of registers.
138 There should be NUM_REGS strings in this initializer. */
140 #define REGISTER_NAMES \
141 { "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7", \
142 "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7", \
143 "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7", \
144 "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7", \
146 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
147 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
148 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
149 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
151 "y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr" }
153 /* Register numbers of various important registers.
154 Note that some of these values are "real" register numbers,
155 and correspond to the general registers of the machine,
156 and some are "phony" register numbers which are too large
157 to be actual register numbers as far as the user is concerned
158 but do serve to get the desired values when passed to read_register. */
160 #define G0_REGNUM 0 /* %g0 */
161 #define G1_REGNUM 1 /* %g1 */
162 #define O0_REGNUM 8 /* %o0 */
163 #define SP_REGNUM 14 /* Contains address of top of stack, \
164 which is also the bottom of the frame. */
165 #define RP_REGNUM 15 /* Contains return address value, *before* \
166 any windows get switched. */
167 #define O7_REGNUM 15 /* Last local reg not saved on stack frame */
168 #define L0_REGNUM 16 /* First local reg that's saved on stack frame
169 rather than in machine registers */
170 #define I0_REGNUM 24 /* %i0 */
171 #define FP_REGNUM 30 /* Contains address of executing stack frame */
172 #define I7_REGNUM 31 /* Last local reg saved on stack frame */
173 #define FP0_REGNUM 32 /* Floating point register 0 */
174 #define Y_REGNUM 64 /* Temp register for multiplication, etc. */
175 #define PS_REGNUM 65 /* Contains processor status */
176 #define PS_FLAG_CARRY 0x100000 /* Carry bit in PS */
177 #define WIM_REGNUM 66 /* Window Invalid Mask (not really supported) */
178 #define TBR_REGNUM 67 /* Trap Base Register (not really supported) */
179 #define PC_REGNUM 68 /* Contains program counter */
180 #define NPC_REGNUM 69 /* Contains next PC */
181 #define FPS_REGNUM 70 /* Floating point status register */
182 #define CPS_REGNUM 71 /* Coprocessor status register */
184 /* Total amount of space needed to store our copies of the machine's
185 register state, the array `registers'. On the sparc, `registers'
186 contains the ins and locals, even though they are saved on the
187 stack rather than with the other registers, and this causes hair
188 and confusion in places like pop_frame. It might be
189 better to remove the ins and locals from `registers', make sure
190 that get_saved_register can get them from the stack (even in the
191 innermost frame), and make this the way to access them. For the
192 frame pointer we would do that via TARGET_READ_FP. On the other hand,
193 that is likely to be confusing or worse for flat frames. */
195 #define REGISTER_BYTES (32*4+32*4+8*4)
197 /* Index within `registers' of the first byte of the space for
200 #define REGISTER_BYTE(N) ((N)*4)
202 /* We need to override GET_SAVED_REGISTER so that we can deal with the way
203 outs change into ins in different frames. HAVE_REGISTER_WINDOWS can't
204 deal with this case and also handle flat frames at the same time. */
207 void sparc_get_saved_register
PARAMS ((char *raw_buffer
, int *optimized
, CORE_ADDR
* addrp
, struct frame_info
* frame
, int regnum
, enum lval_type
* lvalp
));
208 #define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \
209 sparc_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
211 /* Number of bytes of storage in the actual machine representation
214 /* On the SPARC, all regs are 4 bytes. */
216 #define REGISTER_RAW_SIZE(N) (4)
218 /* Number of bytes of storage in the program's representation
221 /* On the SPARC, all regs are 4 bytes. */
223 #define REGISTER_VIRTUAL_SIZE(N) (4)
225 /* Largest value REGISTER_RAW_SIZE can have. */
227 #define MAX_REGISTER_RAW_SIZE 8
229 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
231 #define MAX_REGISTER_VIRTUAL_SIZE 8
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_by_hand.
247 The ultimate mystery is, tho, what is the value "16"? */
249 #define STORE_STRUCT_RETURN(ADDR, SP) \
251 store_unsigned_integer (val, 4, (ADDR)); \
252 write_memory ((SP)+(16*4), val, 4); }
254 /* Extract from an array REGBUF containing the (raw) register state
255 a function return value of type TYPE, and copy that, in virtual format,
258 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
259 sparc_extract_return_value(TYPE, REGBUF, VALBUF)
261 sparc_extract_return_value
PARAMS ((struct type
*, char[], char *));
263 /* Write into appropriate registers a function return value
264 of type TYPE, given in virtual format. */
265 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
266 sparc_store_return_value(TYPE, VALBUF)
267 extern void sparc_store_return_value
PARAMS ((struct type
*, char *));
269 /* Extract from an array REGBUF containing the (raw) register state
270 the address in which a function should return its structure value,
271 as a CORE_ADDR (or an expression that can be used as one). */
273 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
274 (sparc_extract_struct_value_address (REGBUF))
277 sparc_extract_struct_value_address
PARAMS ((char[REGISTER_BYTES
]));
280 /* Describe the pointer in each stack frame to the previous stack frame
283 /* FRAME_CHAIN takes a frame's nominal address
284 and produces the frame's chain-pointer. */
286 /* In the case of the Sun 4, the frame-chain's nominal address
287 is held in the frame pointer register.
289 On the Sun4, the frame (in %fp) is %sp for the previous frame.
290 From the previous frame's %sp, we can find the previous frame's
291 %fp: it is in the save area just above the previous frame's %sp.
293 If we are setting up an arbitrary frame, we'll need to know where
294 it ends. Hence the following. This part of the frame cache
295 structure should be checked before it is assumed that this frame's
296 bottom is in the stack pointer.
298 If there isn't a frame below this one, the bottom of this frame is
299 in the stack pointer.
301 If there is a frame below this one, and the frame pointers are
302 identical, it's a leaf frame and the bottoms are the same also.
304 Otherwise the bottom of this frame is the top of the next frame.
306 The bottom field is misnamed, since it might imply that memory from
307 bottom to frame contains this frame. That need not be true if
308 stack frames are allocated in different segments (e.g. some on a
309 stack, some on a heap in the data segment).
311 GCC 2.6 and later can generate ``flat register window'' code that
312 makes frames by explicitly saving those registers that need to be
313 saved. %i7 is used as the frame pointer, and the frame is laid out so
314 that flat and non-flat calls can be intermixed freely within a
315 program. Unfortunately for GDB, this means it must detect and record
316 the flatness of frames.
318 Since the prologue in a flat frame also tells us where fp and pc
319 have been stashed (the frame is of variable size, so their location
320 is not fixed), it's convenient to record them in the frame info. */
322 #define EXTRA_FRAME_INFO \
326 /* Following fields only relevant for flat frames. */ \
329 /* Add this to ->frame to get the value of the stack pointer at the */ \
330 /* time of the register saves. */ \
333 #define FRAME_INIT_SAVED_REGS(fp) /*no-op */
335 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
336 sparc_init_extra_frame_info (fromleaf, fci)
337 extern void sparc_init_extra_frame_info
PARAMS ((int, struct frame_info
*));
339 #define PRINT_EXTRA_FRAME_INFO(fi) \
341 if ((fi) && (fi)->flat) \
342 printf_filtered (" flat, pc saved at 0x%s, fp saved at 0x%s\n", \
343 paddr_nz ((fi)->pc_addr), paddr_nz ((fi)->fp_addr)); \
346 #define FRAME_CHAIN(thisframe) (sparc_frame_chain (thisframe))
347 extern CORE_ADDR sparc_frame_chain
PARAMS ((struct frame_info
*));
349 /* INIT_EXTRA_FRAME_INFO needs the PC to detect flat frames. */
351 #define INIT_FRAME_PC(fromleaf, prev) /* nothing */
352 #define INIT_FRAME_PC_FIRST(fromleaf, prev) \
353 (prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \
354 (prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ());
356 /* Define other aspects of the stack frame. */
358 /* A macro that tells us whether the function invocation represented
359 by FI does not have a frame on the stack associated with it. If it
360 does not, FRAMELESS is set to 1, else 0. */
361 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
362 (frameless_look_for_prologue(FI))
364 /* The location of I0 w.r.t SP. This is actually dependent on how the system's
365 window overflow/underflow routines are written. Most vendors save the L regs
366 followed by the I regs (at the higher address). Some vendors get it wrong.
369 #define FRAME_SAVED_L0 0
370 #define FRAME_SAVED_I0 (8 * REGISTER_RAW_SIZE (L0_REGNUM))
372 /* Where is the PC for a specific frame */
374 #define FRAME_SAVED_PC(FRAME) sparc_frame_saved_pc (FRAME)
375 extern CORE_ADDR sparc_frame_saved_pc
PARAMS ((struct frame_info
*));
377 /* If the argument is on the stack, it will be here. */
378 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
380 #define FRAME_STRUCT_ARGS_ADDRESS(fi) ((fi)->frame)
382 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
384 /* Set VAL to the number of args passed to frame described by FI.
385 Can set VAL to -1, meaning no way to tell. */
387 /* We can't tell how many args there are
388 now that the C compiler delays popping them. */
389 #define FRAME_NUM_ARGS(fi) (-1)
391 /* Return number of bytes at start of arglist that are not really args. */
393 #define FRAME_ARGS_SKIP 68
395 /* Things needed for making the inferior call functions. */
397 * First of all, let me give my opinion of what the DUMMY_FRAME
398 * actually looks like.
402 * + - - - - - - - - - - - - - - - - +<-- fp (level 0)
407 * | Frame of innermost program |
414 * |---------------------------------|<-- sp (level 0), fp (c)
418 * | ------ |<-- fp - 0x80
419 * FRAME | g0-7 |<-- fp - 0xa0
420 * | i0-7 |<-- fp - 0xc0
421 * | other |<-- fp - 0xe0
424 * |---------------------------------|<-- sp' = fp - 0x140
427 * sp' + 0x94 -->| CALL_DUMMY (x code) |
430 * |---------------------------------|<-- sp'' = fp - 0x200
431 * | align sp to 8 byte boundary |
432 * | ==> args to fn <== |
434 * i & l's + agg | CALL_DUMMY_STACK_ADJUST = 0x0x44|
435 * |---------------------------------|<-- final sp (variable)
437 * | Where function called will |
442 * I understand everything in this picture except what the space
443 * between fp - 0xe0 and fp - 0x140 is used for. Oh, and I don't
444 * understand why there's a large chunk of CALL_DUMMY that never gets
445 * executed (its function is superceeded by PUSH_DUMMY_FRAME; they
446 * are designed to do the same thing).
448 * PUSH_DUMMY_FRAME saves the registers above sp' and pushes the
449 * register file stack down one.
451 * call_function then writes CALL_DUMMY, pushes the args onto the
452 * stack, and adjusts the stack pointer.
454 * run_stack_dummy then starts execution (in the middle of
455 * CALL_DUMMY, as directed by call_function).
458 /* Push an empty stack frame, to record the current PC, etc. */
460 #define PUSH_DUMMY_FRAME sparc_push_dummy_frame ()
461 #define POP_FRAME sparc_pop_frame ()
463 void sparc_push_dummy_frame
PARAMS ((void)), sparc_pop_frame
PARAMS ((void));
466 /* This sequence of words is the instructions
468 0: bc 10 00 01 mov %g1, %fp
469 4: 9d e3 80 00 save %sp, %g0, %sp
470 8: bc 10 00 02 mov %g2, %fp
471 c: be 10 00 03 mov %g3, %i7
472 10: da 03 a0 58 ld [ %sp + 0x58 ], %o5
473 14: d8 03 a0 54 ld [ %sp + 0x54 ], %o4
474 18: d6 03 a0 50 ld [ %sp + 0x50 ], %o3
475 1c: d4 03 a0 4c ld [ %sp + 0x4c ], %o2
476 20: d2 03 a0 48 ld [ %sp + 0x48 ], %o1
477 24: 40 00 00 00 call <fun>
478 28: d0 03 a0 44 ld [ %sp + 0x44 ], %o0
484 * the first four instructions are necessary only on the simulator.
485 * this is a multiple of 8 (not only 4) bytes.
486 * the `call' insn is a relative, not an absolute call.
487 * the `nop' at the end is needed to keep the trap from
488 clobbering things (if NPC pointed to garbage instead).
491 #define CALL_DUMMY { 0xbc100001, 0x9de38000, 0xbc100002, 0xbe100003, \
492 0xda03a058, 0xd803a054, 0xd603a050, 0xd403a04c, \
493 0xd203a048, 0x40000000, 0xd003a044, 0x01000000, \
494 0x91d02001, 0x01000000 }
497 /* Size of the call dummy in bytes. */
499 #define CALL_DUMMY_LENGTH 0x38
501 /* Offset within call dummy of first instruction to execute. */
503 #define CALL_DUMMY_START_OFFSET 0
505 /* Offset within CALL_DUMMY of the 'call' instruction. */
507 #define CALL_DUMMY_CALL_OFFSET (CALL_DUMMY_START_OFFSET + 0x24)
509 /* Offset within CALL_DUMMY of the 'ta 1' instruction. */
511 #define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + 0x30)
513 #define CALL_DUMMY_STACK_ADJUST 68
516 /* Insert the specified number of args and function address
517 into a call sequence of the above form stored at DUMMYNAME. */
519 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
520 sparc_fix_call_dummy (dummyname, pc, fun, type, gcc_p)
521 void sparc_fix_call_dummy
PARAMS ((char *dummy
, CORE_ADDR pc
, CORE_ADDR fun
,
522 struct type
* value_type
, int using_gcc
));
524 /* The Sparc returns long doubles on the stack. */
526 #define RETURN_VALUE_ON_STACK(TYPE) \
527 (TYPE_CODE(TYPE) == TYPE_CODE_FLT \
528 && TYPE_LENGTH(TYPE) > 8)
530 /* Sparc has no reliable single step ptrace call */
532 #define SOFTWARE_SINGLE_STEP_P 1
533 extern void sparc_software_single_step
PARAMS ((unsigned int, int));
534 #define SOFTWARE_SINGLE_STEP(sig,bp_p) sparc_software_single_step (sig,bp_p)
536 /* We need more arguments in a frame specification for the
537 "frame" or "info frame" command. */
539 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
540 extern struct frame_info
*setup_arbitrary_frame
PARAMS ((int, CORE_ADDR
*));
542 /* To print every pair of float registers as a double, we use this hook.
543 We also print the condition code registers in a readable format
544 (FIXME: can expand this to all control regs). */
546 #undef PRINT_REGISTER_HOOK
547 #define PRINT_REGISTER_HOOK(regno) \
548 sparc_print_register_hook (regno)
549 extern void sparc_print_register_hook
PARAMS ((int regno
));
552 /* Optimization for storing registers to the inferior. The hook
554 actually executes any deferred stores. It is called any time
555 we are going to proceed the child, or read its registers.
556 The hook CLEAR_DEFERRED_STORES is called when we want to throw
557 away the inferior process, e.g. when it dies or we kill it.
558 FIXME, this does not handle remote debugging cleanly. */
560 extern int deferred_stores
;
561 #define DO_DEFERRED_STORES \
562 if (deferred_stores) \
563 target_store_registers (-2);
564 #define CLEAR_DEFERRED_STORES \
567 /* If the current gcc for for this target does not produce correct debugging
568 information for float parameters, both prototyped and unprototyped, then
569 define this macro. This forces gdb to always assume that floats are
570 passed as doubles and then converted in the callee. */
572 #define COERCE_FLOAT_TO_DOUBLE(formal, actual) (1)
574 /* Select the sparc disassembler */
576 #define TM_PRINT_INSN_MACH bfd_mach_sparc
578 /* Arguments smaller than an int must promoted to ints when synthesizing
581 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
582 (sparc_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr)))
584 sparc_push_arguments
PARAMS ((int, struct value
**, CORE_ADDR
, int, CORE_ADDR
));