1 /* Parameters for target machine of AMD 29000, for GDB, the GNU debugger.
2 Copyright 1990, 1991 Free Software Foundation, Inc.
3 Contributed by Cygnus Support. Written by Jim Kingdon.
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 /* Parameters for an EB29K (a board which plugs into a PC and is
22 accessed through EBMON software running on the PC, which we
23 use as we'd use a remote stub (see remote-eb.c).
25 If gdb is ported to other 29k machines/systems, the
26 machine/system-specific parts should be removed from this file (a
29 /* Byte order is configurable, but this machine runs big-endian. */
30 #define TARGET_BYTE_ORDER BIG_ENDIAN
32 /* Floating point uses IEEE representations. */
35 /* Recognize our magic number. */
36 #define BADMAG(x) ((x).f_magic != 0572)
38 /* Define this if the C compiler puts an underscore at the front
39 of external names before giving them to the linker. */
41 #define NAMES_HAVE_UNDERSCORE
43 /* Offset from address of function to start of its code.
44 Zero on most machines. */
46 #define FUNCTION_START_OFFSET 0
48 /* Advance PC across any function entry prologue instructions
49 to reach some "real" code. */
51 #define SKIP_PROLOGUE(pc) \
52 { pc = skip_prologue (pc); }
53 CORE_ADDR
skip_prologue ();
55 /* Immediately after a function call, return the saved pc.
56 Can't go through the frames for this because on some machines
57 the new frame is not set up until the new function executes
60 #define SAVED_PC_AFTER_CALL(frame) (read_register (LR0_REGNUM))
62 /* I'm not sure about the exact value of this, but based on looking
63 at the stack pointer when we get to main this seems to be right.
65 This is the register stack; We call it "CONTROL" in GDB for consistency
67 #define CONTROL_END_ADDR 0x80200000
69 /* Memory stack. This is for the default register stack size, which is
70 only 0x800 bytes. Perhaps we should let the user specify stack sizes
71 (and tell EBMON with the "ZS" command). */
72 #define STACK_END_ADDR 0x801ff800
74 /* Stack grows downward. */
78 /* Stack must be aligned on 32-bit word boundaries. */
79 #define STACK_ALIGN(ADDR) (((ADDR) + 3) & ~3)
81 /* Sequence of bytes for breakpoint instruction. */
82 /* ASNEQ 0x50, gr1, gr1
83 The trap number 0x50 is chosen arbitrarily. */
84 #if TARGET_BYTE_ORDER == BIG_ENDIAN
85 #define BREAKPOINT {0x72, 0x50, 0x01, 0x01}
86 #else /* Target is little-endian. */
87 #define BREAKPOINT {0x01, 0x01, 0x50, 0x72}
88 #endif /* Target is little-endian. */
90 /* Amount PC must be decremented by after a breakpoint.
91 This is often the number of bytes in BREAKPOINT
94 #define DECR_PC_AFTER_BREAK 0
96 /* Nonzero if instruction at PC is a return instruction.
97 On the 29k, this is a "jmpi l0" instruction. */
99 #define ABOUT_TO_RETURN(pc) \
100 ((read_memory_integer (pc, 4) & 0xff0000ff) == 0xc0000080)
102 /* Return 1 if P points to an invalid floating point value. */
104 #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
106 /* Say how long (ordinary) registers are. */
108 #define REGISTER_TYPE long
110 /* Allow the register declarations here to be overridden for remote
112 #if !defined (REGISTER_NAMES)
114 /* Number of machine registers */
118 /* Initializer for an array of names of registers.
119 There should be NUM_REGS strings in this initializer.
121 FIXME, add floating point registers and support here.
123 Also note that this list does not attempt to deal with kernel
124 debugging (in which the first 32 registers are gr64-gr95). */
126 #define REGISTER_NAMES \
127 {"gr96", "gr97", "gr98", "gr99", "gr100", "gr101", "gr102", "gr103", "gr104", \
128 "gr105", "gr106", "gr107", "gr108", "gr109", "gr110", "gr111", "gr112", \
129 "gr113", "gr114", "gr115", "gr116", "gr117", "gr118", "gr119", "gr120", \
130 "gr121", "gr122", "gr123", "gr124", "gr125", "gr126", "gr127", \
131 "lr0", "lr1", "lr2", "lr3", "lr4", "lr5", "lr6", "lr7", "lr8", "lr9", \
132 "lr10", "lr11", "lr12", "lr13", "lr14", "lr15", "lr16", "lr17", "lr18", \
133 "lr19", "lr20", "lr21", "lr22", "lr23", "lr24", "lr25", "lr26", "lr27", \
134 "lr28", "lr29", "lr30", "lr31", "lr32", "lr33", "lr34", "lr35", "lr36", \
135 "lr37", "lr38", "lr39", "lr40", "lr41", "lr42", "lr43", "lr44", "lr45", \
136 "lr46", "lr47", "lr48", "lr49", "lr50", "lr51", "lr52", "lr53", "lr54", \
137 "lr55", "lr56", "lr57", "lr58", "lr59", "lr60", "lr61", "lr62", "lr63", \
138 "lr64", "lr65", "lr66", "lr67", "lr68", "lr69", "lr70", "lr71", "lr72", \
139 "lr73", "lr74", "lr75", "lr76", "lr77", "lr78", "lr79", "lr80", "lr81", \
140 "lr82", "lr83", "lr84", "lr85", "lr86", "lr87", "lr88", "lr89", "lr90", \
141 "lr91", "lr92", "lr93", "lr94", "lr95", "lr96", "lr97", "lr98", "lr99", \
142 "lr100", "lr101", "lr102", "lr103", "lr104", "lr105", "lr106", "lr107", \
143 "lr108", "lr109", "lr110", "lr111", "lr112", "lr113", "lr114", "lr115", \
144 "lr116", "lr117", "lr118", "lr119", "lr120", "lr121", "lr122", "lr123", \
145 "lr124", "lr125", "lr126", "lr127", \
146 "AI0", "AI1", "AI2", "AI3", "AI4", "AI5", "AI6", "AI7", "AI8", "AI9", \
147 "AI10", "AI11", "AI12", "AI13", "AI14", "AI15", "FP", \
148 "bp", "fc", "cr", "q", \
149 "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr", \
150 "pc0", "pc1", "pc2", "mmu", "lru", "fpe", "inte", "fps", "exo", "gr1", \
151 "alu", "ipc", "ipa", "ipb" }
154 * Provide the processor register numbers of some registers that are
155 * expected/written in instructions that might change under different
156 * register sets. Namely, gcc can compile (-mkernel-registers) so that
157 * it uses gr64-gr95 in stead of gr96-gr127.
159 #define MSP_HW_REGNUM 125 /* gr125 */
160 #define RAB_HW_REGNUM 126 /* gr126 */
162 /* Convert Processor Special register #x to REGISTER_NAMES register # */
163 #define SR_REGNUM(x) \
164 ((x) < 15 ? VAB_REGNUM + (x) \
165 : (x) >= 128 && (x) < 131 ? IPC_REGNUM + (x) - 128 \
166 : (x) == 131 ? Q_REGNUM \
167 : (x) == 132 ? ALU_REGNUM \
168 : (x) >= 133 && (x) < 136 ? BP_REGNUM + (x) - 133 \
169 : (x) >= 160 && (x) < 163 ? FPE_REGNUM + (x) - 160 \
170 : (x) == 164 ? EXO_REGNUM \
171 : (error ("Internal error in SR_REGNUM"), 0))
172 #define GR96_REGNUM 0
173 /* Define the return register separately, so it can be overridden for
174 kernel procedure calling conventions. */
175 #define RETURN_REGNUM GR96_REGNUM
176 #define GR1_REGNUM 200
177 /* This needs to be the memory stack pointer, not the register stack pointer,
178 to make call_function work right. */
179 #define SP_REGNUM MSP_REGNUM
180 #define FP_REGNUM 33 /* lr1 */
181 /* Large Return Pointer (gr123). */
182 #define LRP_REGNUM (123 - 96 + GR96_REGNUM)
183 /* Static link pointer (gr124). */
184 #define SLP_REGNUM (124 - 96 + GR96_REGNUM)
185 /* Memory Stack Pointer (gr125). */
186 #define MSP_REGNUM (125 - 96 + GR96_REGNUM)
187 /* Register allocate bound (gr126). */
188 #define RAB_REGNUM (126 - 96 + GR96_REGNUM)
189 /* Register Free Bound (gr127). */
190 #define RFB_REGNUM (127 - 96 + GR96_REGNUM)
191 /* Register Stack Pointer. */
192 #define RSP_REGNUM GR1_REGNUM
193 #define LR0_REGNUM 32
194 #define BP_REGNUM 177
195 #define FC_REGNUM 178
196 #define CR_REGNUM 179
198 #define VAB_REGNUM 181
199 #define OPS_REGNUM (VAB_REGNUM + 1)
200 #define CPS_REGNUM (VAB_REGNUM + 2)
201 #define CFG_REGNUM (VAB_REGNUM + 3)
202 #define CHA_REGNUM (VAB_REGNUM + 4)
203 #define CHD_REGNUM (VAB_REGNUM + 5)
204 #define CHC_REGNUM (VAB_REGNUM + 6)
205 #define RBP_REGNUM (VAB_REGNUM + 7)
206 #define TMC_REGNUM (VAB_REGNUM + 8)
207 #define TMR_REGNUM (VAB_REGNUM + 9)
208 #define NPC_REGNUM (VAB_REGNUM + 10) /* pc0 */
209 #define PC_REGNUM (VAB_REGNUM + 11) /* pc1 */
210 #define PC2_REGNUM (VAB_REGNUM + 12)
211 #define MMU_REGNUM (VAB_REGNUM + 13)
212 #define LRU_REGNUM (VAB_REGNUM + 14)
213 #define FPE_REGNUM (VAB_REGNUM + 15)
214 #define INTE_REGNUM (VAB_REGNUM + 16)
215 #define FPS_REGNUM (VAB_REGNUM + 17)
216 #define EXO_REGNUM (VAB_REGNUM + 18)
217 /* gr1 is defined above as 200 = VAB_REGNUM + 19 */
218 #define ALU_REGNUM (VAB_REGNUM + 20)
219 #define PS_REGNUM ALU_REGNUM
220 #define IPC_REGNUM (VAB_REGNUM + 21)
221 #define IPA_REGNUM (VAB_REGNUM + 22)
222 #define IPB_REGNUM (VAB_REGNUM + 23)
224 #endif /* !defined(REGISTER_NAMES) */
226 /* Total amount of space needed to store our copies of the machine's
227 register state, the array `registers'. */
228 #define REGISTER_BYTES (NUM_REGS * 4)
230 /* Index within `registers' of the first byte of the space for
232 #define REGISTER_BYTE(N) ((N)*4)
234 /* Number of bytes of storage in the actual machine representation
237 /* All regs are 4 bytes. */
239 #define REGISTER_RAW_SIZE(N) (4)
241 /* Number of bytes of storage in the program's representation
244 /* All regs are 4 bytes. */
246 #define REGISTER_VIRTUAL_SIZE(N) (4)
248 /* Largest value REGISTER_RAW_SIZE can have. */
250 #define MAX_REGISTER_RAW_SIZE (4)
252 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
254 #define MAX_REGISTER_VIRTUAL_SIZE (4)
256 /* Nonzero if register N requires conversion
257 from raw format to virtual format. */
259 #define REGISTER_CONVERTIBLE(N) (0)
261 /* Convert data from raw format for register REGNUM
262 to virtual format for register REGNUM. */
264 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
265 { bcopy ((FROM), (TO), 4); }
267 /* Convert data from virtual format for register REGNUM
268 to raw format for register REGNUM. */
270 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
271 { bcopy ((FROM), (TO), 4); }
273 /* Return the GDB type object for the "standard" data type
274 of data in register N. */
276 #define REGISTER_VIRTUAL_TYPE(N) \
277 (((N) == PC_REGNUM || (N) == LRP_REGNUM || (N) == SLP_REGNUM \
278 || (N) == MSP_REGNUM || (N) == RAB_REGNUM || (N) == RFB_REGNUM \
279 || (N) == GR1_REGNUM || (N) == FP_REGNUM || (N) == LR0_REGNUM \
280 || (N) == NPC_REGNUM || (N) == PC2_REGNUM) \
281 ? lookup_pointer_type (builtin_type_void) : builtin_type_int)
283 /* Store the address of the place in which to copy the structure the
284 subroutine will return. This is called from call_function. */
285 /* On the 29k the LRP points to the part of the structure beyond the first
287 #define STORE_STRUCT_RETURN(ADDR, SP) \
288 write_register (LRP_REGNUM, (ADDR) + 16 * 4);
290 /* Should call_function allocate stack space for a struct return? */
291 /* On the 29k objects over 16 words require the caller to allocate space. */
292 #define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH (type) > 16 * 4)
294 /* Extract from an array REGBUF containing the (raw) register state
295 a function return value of type TYPE, and copy that, in virtual format,
298 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
300 int reg_length = TYPE_LENGTH (TYPE); \
301 if (reg_length > 16 * 4) \
303 reg_length = 16 * 4; \
304 read_memory (*((int *)(REGBUF) + LRP_REGNUM), (VALBUF) + 16 * 4, \
305 TYPE_LENGTH (TYPE) - 16 * 4); \
307 bcopy (((int *)(REGBUF))+RETURN_REGNUM, (VALBUF), reg_length); \
310 /* Write into appropriate registers a function return value
311 of type TYPE, given in virtual format. */
313 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
315 int reg_length = TYPE_LENGTH (TYPE); \
316 if (reg_length > 16 * 4) \
318 reg_length = 16 * 4; \
319 write_memory (read_register (LRP_REGNUM), \
320 (char *)(VALBUF) + 16 * 4, \
321 TYPE_LENGTH (TYPE) - 16 * 4); \
323 write_register_bytes (REGISTER_BYTE (RETURN_REGNUM), (char *)(VALBUF), \
324 TYPE_LENGTH (TYPE)); \
327 /* The am29k user's guide documents well what the stacks look like.
328 But what isn't so clear there is how this interracts with the
329 symbols, or with GDB.
330 In the following saved_msp, saved memory stack pointer (which functions
331 as a memory frame pointer), means either
332 a register containing the memory frame pointer or, in the case of
333 functions with fixed size memory frames (i.e. those who don't use
334 alloca()), the result of the calculation msp + msize.
336 LOC_ARG, LOC_LOCAL - For GCC, these are relative to saved_msp.
337 For high C, these are relative to msp (making alloca impossible).
338 LOC_REGISTER, LOC_REGPARM - The register number is the number at the
339 time the function is running (after the prologue), or in the case
340 of LOC_REGPARM, may be a register number in the range 160-175.
342 The compilers do things like store an argument into memory, and then put out
343 a LOC_ARG for it, or put it into global registers and put out a
344 LOC_REGPARM. Thus is it important to execute the first line of
345 code (i.e. the line of the open brace, i.e. the prologue) of a function
346 before trying to print arguments or anything.
348 The following diagram attempts to depict what is going on in memory
349 (see also the _am29k user's guide_) and also how that interacts with
350 GDB frames. We arbitrarily pick fci->frame to point the same place
351 as the register stack pointer; since we set it ourself in
352 INIT_EXTRA_FRAME_INFO, and access it only through the FRAME_*
353 macros, it doesn't really matter exactly how we
354 do it. However, note that FRAME_FP is used in two ways in GDB:
355 (1) as a "magic cookie" which uniquely identifies frames (even over
356 calls to the inferior), (2) (in PC_IN_CALL_DUMMY [ON_STACK])
357 as the value of SP_REGNUM before the dummy frame was pushed. These
358 two meanings would be incompatible for the 29k if we defined
359 CALL_DUMMY_LOCATION == ON_STACK (but we don't, so don't worry about it).
360 Also note that "lr1" below, while called a frame pointer
361 in the user's guide, has only one function: To determine whether
362 registers need to be filled in the function epilogue.
367 bar: sub gr1,gr1,rsize_b
374 foo: sub gr1,gr1,rsize_f
379 loc3: < suppose the inferior stops here >
381 memory stack register stack
384 +------->|___________| | | ^
385 | | ^ | | locals_b | |
386 | | | | |____________| |
387 | | | | | | | rsize_b
388 | | | msize_b | | args_to_f | |
389 | | | | |____________| |
390 | | | | |____lr1_____| V
391 | | V | |____loc2____|<----------------+
392 | +--->|___________|<---------mfp | ^ |
393 | | | ^ | | locals_f | | |
394 | | | | msize_f | |____________| | |
395 | | | | | | | | rsize_f |
396 | | | V | | args | | |
397 | | |___________|<msp |____________| | |
398 | | |_____lr1____| V |
399 | | |___garbage__| <- gr1 <----+ |
406 | | |_________________| | |
407 | | |rsize=rsize_b | | |
408 | | |msize=msize_b | | |
409 +---|--------saved_msp | | |
410 | |frame------------------------------------|---+
412 | |_________________| |
415 +--------saved_msp | |
416 |frame------------------------------------+
420 So, is that sufficiently confusing? Welcome to the 29000.
422 * The frame for foo uses a memory frame pointer but the frame for
423 bar does not. In the latter case the saved_msp is
424 computed by adding msize to the saved_msp of the
426 * msize is in the frame cache only for high C's sake. */
428 void read_register_stack ();
429 long read_register_stack_integer ();
431 #define EXTRA_FRAME_INFO \
432 CORE_ADDR saved_msp; \
433 unsigned int rsize; \
434 unsigned int msize; \
437 /* Bits for flags in EXTRA_FRAME_INFO */
438 #define TRANSPARENT 0x1 /* This is a transparent frame */
439 #define MFP_USED 0x2 /* A memory frame pointer is used */
441 /* Because INIT_FRAME_PC gets passed fromleaf, that's where we init
442 not only ->pc and ->frame, but all the extra stuff, when called from
443 get_prev_frame_info, that is. */
444 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)
445 void init_extra_frame_info ();
447 #define INIT_FRAME_PC(fromleaf, fci) init_frame_pc(fromleaf, fci)
448 void init_frame_pc ();
451 /* FRAME_CHAIN takes a FRAME
452 and produces the frame's chain-pointer.
454 However, if FRAME_CHAIN_VALID returns zero,
455 it means the given frame is the outermost one and has no caller. */
457 /* On the 29k, the nominal address of a frame is the address on the
458 register stack of the return address (the one next to the incoming
459 arguments, not down at the bottom so nominal address == stack pointer).
461 GDB expects "nominal address" to equal contents of FP_REGNUM,
462 at least when it comes time to create the innermost frame.
463 However, that doesn't work for us, so when creating the innermost
464 frame we set ->frame ourselves in INIT_EXTRA_FRAME_INFO. */
466 /* These are mostly dummies for the 29k because INIT_FRAME_PC
467 sets prev->frame instead. */
468 #define FRAME_CHAIN(thisframe) ((thisframe)->frame + (thisframe)->rsize)
470 /* Determine if the frame has a 'previous' and back-traceable frame. */
471 #define FRAME_IS_UNCHAINED(frame) ((frame)->flags & TRANSPARENT)
473 /* Find the previous frame of a transparent routine.
474 * For now lets not try and trace through a transparent routine (we might
475 * have to assume that all transparent routines are traps).
477 #define FIND_PREV_UNCHAINED_FRAME(frame) 0
479 /* Define other aspects of the stack frame. */
481 /* A macro that tells us whether the function invocation represented
482 by FI does not have a frame on the stack associated with it. If it
483 does not, FRAMELESS is set to 1, else 0. */
484 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
485 (FRAMELESS) = frameless_look_for_prologue(FI)
487 /* Saved pc (i.e. return address). */
488 #define FRAME_SAVED_PC(fraim) \
489 (read_register_stack_integer ((fraim)->frame + (fraim)->rsize, 4))
491 /* Local variables (i.e. LOC_LOCAL) are on the memory stack, with their
492 offsets being relative to the memory stack pointer (high C) or
495 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address (fi)
496 extern CORE_ADDR
frame_locals_address ();
498 /* Return number of args passed to a frame.
499 Can return -1, meaning no way to tell. */
500 /* While we could go the effort of finding the tags word and getting
501 the argcount field from it,
502 (1) It only counts arguments in registers, i.e. the first 16 words
504 (2) It gives the number of arguments the function was declared with
505 not how many it was called with (or some variation, like all 16
506 words for varadic functions). This makes argcount pretty much
507 redundant with -g info, even for varadic functions.
509 #define FRAME_NUM_ARGS(numargs, fi) ((numargs) = -1)
511 #define FRAME_ARGS_ADDRESS(fi) FRAME_LOCALS_ADDRESS (fi)
513 /* Return number of bytes at start of arglist that are not really args. */
515 #define FRAME_ARGS_SKIP 0
517 /* Provide our own get_saved_register. HAVE_REGISTER_WINDOWS is insufficient
518 because registers get renumbered on the 29k without getting saved. */
520 #define GET_SAVED_REGISTER
522 /* Call function stuff. */
524 /* The dummy frame looks like this (see also the general frame picture
529 | | frame for function
530 | locals_sproc | executing at time
531 |________________| of call_function.
532 | | We must not disturb
533 | args_out_sproc | it.
534 memory stack |________________|
535 |____lr1_sproc___|<-+
536 | | |__retaddr_sproc_| | <-- gr1 (at start)
537 |____________|<-msp 0 <-----------mfp_dummy_____| |
538 | | (at start) | save regs | |
539 | arg_slop | | pc0,pc1 | |
540 | (16 words) | | gr96-gr124 | |
541 |____________|<-msp 1--after | sr160-sr162 | |
542 | | PUSH_DUMMY_FRAME| sr128-sr135 | |
543 | struct ret | |________________| |
545 |____________|<- lrp | args_out_dummy | |
546 | struct ret | | (16 words) | |
547 | 16 | |________________| |
548 | (16 words) | |____lr1_dummy___|--+
549 |____________|<- msp 2--after |_retaddr_dummy__|<- gr1 after
550 | | struct ret | | PUSH_DUMMY_FRAME
551 | margs17+ | area allocated | locals_inf |
552 | | |________________| called
553 |____________|<- msp 4--when | | function's
554 | | inf called | args_out_inf | frame (set up
555 | margs16 | |________________| by called
556 | (16 words) | |_____lr1_inf____| function).
557 |____________|<- msp 3--after | . |
558 | | args pushed | . |
562 arg_slop: This area is so that when the call dummy adds 16 words to
563 the msp, it won't end up larger than mfp_dummy (it is needed in the
564 case where margs and struct_ret do not add up to at least 16 words).
565 struct ret: This area is allocated by GDB if the return value is more
566 than 16 words. struct ret_16 is not used on the 29k.
567 margs: Pushed by GDB. The call dummy copies the first 16 words to
569 retaddr_sproc: Contains the PC at the time we call the function.
570 set by PUSH_DUMMY_FRAME and read by POP_FRAME.
571 retaddr_dummy: This points to a breakpoint instruction in the dummy. */
573 /* Rsize for dummy frame, in bytes. */
575 /* Bytes for outgoing args, lr1, and retaddr. */
576 #define DUMMY_ARG (2 * 4 + 16 * 4)
578 /* Number of special registers (sr128-) to save. */
579 #define DUMMY_SAVE_SR128 8
580 /* Number of special registers (sr160-) to save. */
581 #define DUMMY_SAVE_SR160 3
582 /* Number of general (gr96- or gr64-) registers to save. */
583 #define DUMMY_SAVE_GREGS 29
585 #define DUMMY_FRAME_RSIZE \
587 + 2 * 4 /* pc0, pc1 */ \
588 + DUMMY_SAVE_GREGS * 4 \
589 + DUMMY_SAVE_SR160 * 4 \
590 + DUMMY_SAVE_SR128 * 4 \
594 /* Push an empty stack frame, to record the current PC, etc. */
596 #define PUSH_DUMMY_FRAME push_dummy_frame()
597 extern void push_dummy_frame ();
599 /* Discard from the stack the innermost frame,
600 restoring all saved registers. */
602 #define POP_FRAME pop_frame()
603 extern void pop_frame ();
605 /* This sequence of words is the instructions
607 loadm 0, 0, lr2, msp ; load first 16 words of arguments into registers
608 add msp, msp, 16 * 4 ; point to the remaining arguments
613 aseq 0x40,gr1,gr1 ; nop
614 asneq 0x50,gr1,gr1 ; breakpoint
617 /* Position of the "const" instruction within CALL_DUMMY in bytes. */
618 #define CONST_INSN (3 * 4)
619 #if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
620 #define CALL_DUMMY {0x0400870f,\
621 0x36008200|(MSP_HW_REGNUM), \
622 0x15000040|(MSP_HW_REGNUM<<8)|(MSP_HW_REGNUM<<16), \
623 0x03ff80ff, 0x02ff80ff, 0xc8008080, 0x70400101, 0x72500101}
624 #else /* Byte order differs. */
626 #endif /* Byte order differs. */
627 #define CALL_DUMMY_LENGTH (8 * 4)
629 #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
631 /* Helper macro for FIX_CALL_DUMMY. WORDP is a long * which points to a
632 word in target byte order; bits 0-7 and 16-23 of *WORDP are replaced with
633 bits 0-7 and 8-15 of DATA (which is in host byte order). */
635 #if TARGET_BYTE_ORDER == BIG_ENDIAN
636 #define STUFF_I16(WORDP, DATA) \
638 *((char *)(WORDP) + 3) = ((DATA) & 0xff);\
639 *((char *)(WORDP) + 1) = (((DATA) >> 8) & 0xff);\
641 #else /* Target is little endian. */
642 #define STUFF_I16(WORDP, DATA) \
644 *(char *)(WORDP
) = ((DATA
) & 0xff);
645 *((char *)(WORDP
) + 2) = (((DATA
) >> 8) & 0xff);
647 #endif /* Target is little endian. */
649 /* Insert the specified number of args and function address
650 into a call sequence of the above form stored at DUMMYNAME. */
652 /* Currently this stuffs in the address of the function that we are calling.
653 If different 29k systems use different breakpoint instructions, it
654 could also stuff BREAKPOINT in the right place (to avoid having to
655 duplicate CALL_DUMMY in each tm-*.h file). */
657 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
659 STUFF_I16((char *)dummyname + CONST_INSN, fun);\
660 STUFF_I16((char *)dummyname + CONST_INSN + 4, fun >> 16);\
663 /* 29k architecture has separate data & instruction memories -- wired to
664 different pins on the chip -- and can't execute the data memory.
665 Also, there should be space after text_end;
666 we won't get a SIGSEGV or scribble on data space. */
668 #define CALL_DUMMY_LOCATION AFTER_TEXT_END
670 /* Because of this, we need (as a kludge) to know the addresses of the
673 #define NEED_TEXT_START_END
675 /* How to translate register numbers in the .stab's into gdb's internal register
676 numbers. We don't translate them, but we warn if an invalid register
677 number is seen. Note that FIXME, we use the value "sym" as an implicit
678 argument in printing the error message. It happens to be available where
679 this macro is used. (This macro definition appeared in a late revision
680 of gdb-3.91.6 and is not well tested. Also, it should be a "complaint".) */
682 #define STAB_REG_TO_REGNUM(num) \
683 (((num) > LR0_REGNUM + 127) \
685 "Invalid register number %d in symbol table entry for %s\n", \
686 (num), SYMBOL_NAME (sym)), (num) \
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