459462216eb39fbff9e49b5f2a700cda25fb0b22
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 GDB 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 1, or (at your option)
12 GDB 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 GDB; see the file COPYING. If not, write to
19 the Free Software Foundation, 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 /* We can either use a.out, encapsulated, or can use COFF */
36 #ifndef COFF_ENCAPSULATE
38 /* This just has to do with what coff header files are in use. */
39 #define COFF_CHECK_X_ZEROES
42 /* Recognize our magic number. */
43 #define BADMAG(x) ((x)->f_magic != 0572)
45 /* Define this if the C compiler puts an underscore at the front
46 of external names before giving them to the linker. */
48 #define NAMES_HAVE_UNDERSCORE
50 /* Offset from address of function to start of its code.
51 Zero on most machines. */
53 #define FUNCTION_START_OFFSET 0
55 /* Advance PC across any function entry prologue instructions
56 to reach some "real" code. */
58 #define SKIP_PROLOGUE(pc) \
59 { pc = skip_prologue (pc); }
60 CORE_ADDR
skip_prologue ();
62 /* Immediately after a function call, return the saved pc.
63 Can't go through the frames for this because on some machines
64 the new frame is not set up until the new function executes
67 #define SAVED_PC_AFTER_CALL(frame) (read_register (LR0_REGNUM))
69 /* I'm not sure about the exact value of this, but based on looking
70 at the stack pointer when we get to main this seems to be right.
72 This is the register stack; We call it "CONTROL" in GDB for consistency
74 #define CONTROL_END_ADDR 0x80200000
76 /* Memory stack. This is for the default register stack size, which is
77 only 0x800 bytes. Perhaps we should let the user specify stack sizes
78 (and tell EBMON with the "ZS" command). */
79 #define STACK_END_ADDR 0x801ff800
81 /* Stack grows downward. */
85 /* Stack must be aligned on 32-bit word boundaries. */
86 #define STACK_ALIGN(ADDR) (((ADDR) + 3) & ~3)
88 /* Sequence of bytes for breakpoint instruction. */
89 /* ASNEQ 0x50, gr1, gr1
90 The trap number 0x50 is chosen arbitrarily. */
91 #if TARGET_BYTE_ORDER == BIG_ENDIAN
92 #define BREAKPOINT {0x72, 0x50, 0x01, 0x01}
93 #else /* Target is little-endian. */
94 #define BREAKPOINT {0x01, 0x01, 0x50, 0x72}
95 #endif /* Target is little-endian. */
97 /* Amount PC must be decremented by after a breakpoint.
98 This is often the number of bytes in BREAKPOINT
101 #define DECR_PC_AFTER_BREAK 4
103 /* Nonzero if instruction at PC is a return instruction.
104 On the 29k, this is a "jmpi l0" instruction. */
106 #define ABOUT_TO_RETURN(pc) \
107 ((read_memory_integer (pc, 4) & 0xff0000ff) == 0xc0000080)
109 /* Return 1 if P points to an invalid floating point value. */
111 #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
113 /* Say how long (ordinary) registers are. */
115 #define REGISTER_TYPE long
117 /* Number of machine registers */
121 /* Initializer for an array of names of registers.
122 There should be NUM_REGS strings in this initializer.
124 FIXME, add floating point registers and support here.
126 Also note that this list does not attempt to deal with kernel
127 debugging (in which the first 32 registers are gr64-gr95). */
129 #define REGISTER_NAMES \
130 {"gr96", "gr97", "gr98", "gr99", "gr100", "gr101", "gr102", "gr103", "gr104", \
131 "gr105", "gr106", "gr107", "gr108", "gr109", "gr110", "gr111", "gr112", \
132 "gr113", "gr114", "gr115", "gr116", "gr117", "gr118", "gr119", "gr120", \
133 "gr121", "gr122", "gr123", "gr124", "gr125", "gr126", "gr127", \
134 "lr0", "lr1", "lr2", "lr3", "lr4", "lr5", "lr6", "lr7", "lr8", "lr9", \
135 "lr10", "lr11", "lr12", "lr13", "lr14", "lr15", "lr16", "lr17", "lr18", \
136 "lr19", "lr20", "lr21", "lr22", "lr23", "lr24", "lr25", "lr26", "lr27", \
137 "lr28", "lr29", "lr30", "lr31", "lr32", "lr33", "lr34", "lr35", "lr36", \
138 "lr37", "lr38", "lr39", "lr40", "lr41", "lr42", "lr43", "lr44", "lr45", \
139 "lr46", "lr47", "lr48", "lr49", "lr50", "lr51", "lr52", "lr53", "lr54", \
140 "lr55", "lr56", "lr57", "lr58", "lr59", "lr60", "lr61", "lr62", "lr63", \
141 "lr64", "lr65", "lr66", "lr67", "lr68", "lr69", "lr70", "lr71", "lr72", \
142 "lr73", "lr74", "lr75", "lr76", "lr77", "lr78", "lr79", "lr80", "lr81", \
143 "lr82", "lr83", "lr84", "lr85", "lr86", "lr87", "lr88", "lr89", "lr90", \
144 "lr91", "lr92", "lr93", "lr94", "lr95", "lr96", "lr97", "lr98", "lr99", \
145 "lr100", "lr101", "lr102", "lr103", "lr104", "lr105", "lr106", "lr107", \
146 "lr108", "lr109", "lr110", "lr111", "lr112", "lr113", "lr114", "lr115", \
147 "lr116", "lr117", "lr118", "lr119", "lr120", "lr121", "lr122", "lr123", \
148 "lr124", "lr125", "lr126", "lr127", \
149 "AI0", "AI1", "AI2", "AI3", "AI4", "AI5", "AI6", "AI7", "AI8", "AI9", \
150 "AI10", "AI11", "AI12", "AI13", "AI14", "AI15", "FP", \
151 "bp", "fc", "cr", "q", \
152 "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr", \
153 "pc0", "pc1", "pc2", "mmu", "lru", "fpe", "int", "fps", "exo", "gr1", \
154 "alu", "ipc", "ipa", "ipb" }
156 /* Special register #x. */
157 #define SR_REGNUM(x) \
158 ((x) < 15 ? VAB_REGNUM + (x) \
159 : (x) >= 128 && (x) < 131 ? IPC_REGNUM + (x) \
160 : (x) == 131 ? Q_REGNUM \
161 : (x) == 132 ? ALU_REGNUM \
162 : (x) >= 133 && (x) < 136 ? BP_REGNUM + (x) \
163 : (x) >= 160 && (x) < 163 ? FPE_REGNUM + (x) \
164 : (x) == 164 ? EXO_REGNUM \
165 : (error ("Internal error in SR_REGNUM"), 0))
166 #define GR96_REGNUM 0
167 #define GR1_REGNUM 200
168 /* This needs to be the memory stack pointer, not the register stack pointer,
169 to make call_function work right. */
170 #define SP_REGNUM MSP_REGNUM
171 #define FP_REGNUM 33 /* lr1 */
172 /* Large Return Pointer (gr123). */
173 #define LRP_REGNUM (123 - 96 + GR96_REGNUM)
174 /* Static link pointer (gr124). */
175 #define SLP_REGNUM (124 - 96 + GR96_REGNUM)
176 /* Memory Stack Pointer (gr125). */
177 #define MSP_REGNUM (125 - 96 + GR96_REGNUM)
178 /* Register allocate bound (gr126). */
179 #define RAB_REGNUM (126 - 96 + GR96_REGNUM)
180 /* Register Free Bound (gr127). */
181 #define RFB_REGNUM (127 - 96 + GR96_REGNUM)
182 /* Register Stack Pointer. */
183 #define RSP_REGNUM GR1_REGNUM
184 #define LR0_REGNUM 32
185 #define PC_REGNUM 192 /* pc1 */
186 #define NPC_REGNUM 191 /* pc0 */
187 #define PC2_REGNUM 193
188 #define BP_REGNUM 177
189 #define FC_REGNUM 178
190 #define CR_REGNUM 179
192 #define VAB_REGNUM 181
193 #define LRU_REGNUM 195
194 #define FPE_REGNUM 196
195 #define INT_REGNUM 197
196 #define FPS_REGNUM 198
197 #define EXO_REGNUM 199
198 #define PS_REGNUM 201
199 #define ALU_REGNUM 201
200 #define IPC_REGNUM 202
201 #define IPB_REGNUM 204
203 /* Total amount of space needed to store our copies of the machine's
204 register state, the array `registers'. */
205 #define REGISTER_BYTES (NUM_REGS * 4)
207 /* Index within `registers' of the first byte of the space for
209 #define REGISTER_BYTE(N) ((N)*4)
211 /* Number of bytes of storage in the actual machine representation
214 /* All regs are 4 bytes. */
216 #define REGISTER_RAW_SIZE(N) (4)
218 /* Number of bytes of storage in the program's representation
221 /* 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 (4)
229 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
231 #define MAX_REGISTER_VIRTUAL_SIZE (4)
233 /* Nonzero if register N requires conversion
234 from raw format to virtual format. */
236 #define REGISTER_CONVERTIBLE(N) (0)
238 /* Convert data from raw format for register REGNUM
239 to virtual format for register REGNUM. */
241 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
242 { bcopy ((FROM), (TO), 4); }
244 /* Convert data from virtual format for register REGNUM
245 to raw format for register REGNUM. */
247 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
248 { bcopy ((FROM), (TO), 4); }
250 /* Return the GDB type object for the "standard" data type
251 of data in register N. */
253 #define REGISTER_VIRTUAL_TYPE(N) \
254 (((N) == PC_REGNUM || (N) == LRP_REGNUM || (N) == SLP_REGNUM \
255 || (N) == MSP_REGNUM || (N) == RAB_REGNUM || (N) == RFB_REGNUM \
256 || (N) == GR1_REGNUM || (N) == FP_REGNUM || (N) == LR0_REGNUM \
257 || (N) == NPC_REGNUM || (N) == PC2_REGNUM) \
258 ? lookup_pointer_type (builtin_type_void) : builtin_type_int)
260 /* Store the address of the place in which to copy the structure the
261 subroutine will return. This is called from call_function. */
262 /* On the 29k the LRP points to the part of the structure beyond the first
264 #define STORE_STRUCT_RETURN(ADDR, SP) \
265 write_register (LRP_REGNUM, (ADDR) + 16 * 4);
267 /* Should call_function allocate stack space for a struct return? */
268 /* On the 29k objects over 16 words require the caller to allocate space. */
269 #define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH (type) > 16 * 4)
271 /* Extract from an array REGBUF containing the (raw) register state
272 a function return value of type TYPE, and copy that, in virtual format,
275 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
277 int reg_length = TYPE_LENGTH (TYPE); \
278 if (reg_length > 16 * 4) \
280 reg_length = 16 * 4; \
281 read_memory (*((int *)(REGBUF) + LRP_REGNUM), (VALBUF) + 16 * 4, \
282 TYPE_LENGTH (TYPE) - 16 * 4); \
284 bcopy (((int *)(REGBUF))+GR96_REGNUM, (VALBUF), reg_length); \
287 /* Write into appropriate registers a function return value
288 of type TYPE, given in virtual format. */
290 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
292 int reg_length = TYPE_LENGTH (TYPE); \
293 if (reg_length > 16 * 4) \
295 reg_length = 16 * 4; \
296 write_memory (read_register (LRP_REGNUM), \
297 (char *)(VALBUF) + 16 * 4, \
298 TYPE_LENGTH (TYPE) - 16 * 4); \
300 write_register_bytes (REGISTER_BYTE (GR96_REGNUM), (char *)(VALBUF), \
301 TYPE_LENGTH (TYPE)); \
304 /* The am29k user's guide documents well what the stacks look like.
305 But what isn't so clear there is how this interracts with the
306 symbols, or with GDB.
307 In the following saved_msp, saved memory stack pointer (which functions
308 as a memory frame pointer), means either
309 a register containing the memory frame pointer or, in the case of
310 functions with fixed size memory frames (i.e. those who don't use
311 alloca()), the result of the calculation msp + msize.
313 LOC_ARG, LOC_LOCAL - For GCC, these are relative to saved_msp.
314 For high C, these are relative to msp (making alloca impossible).
315 LOC_REGISTER, LOC_REGPARM - The register number is the number at the
316 time the function is running (after the prologue), or in the case
317 of LOC_REGPARM, may be a register number in the range 160-175.
319 The compilers do things like store an argument into memory, and then put out
320 a LOC_ARG for it, or put it into global registers and put out a
321 LOC_REGPARM. Thus is it important to execute the first line of
322 code (i.e. the line of the open brace, i.e. the prologue) of a function
323 before trying to print arguments or anything.
325 The following diagram attempts to depict what is going on in memory
326 (see also the _am29k user's guide_) and also how that interacts with
327 GDB frames. We arbitrarily pick fci->frame to point the same place
328 as the register stack pointer; since we set it ourself in
329 INIT_EXTRA_FRAME_INFO, and access it only through the FRAME_*
330 macros, it doesn't really matter exactly how we
331 do it. However, note that FRAME_FP is used in two ways in GDB:
332 (1) as a "magic cookie" which uniquely identifies frames (even over
333 calls to the inferior), (2) (in PC_IN_CALL_DUMMY [!CANNOT_EXECUTE_STACK])
334 as the value of SP_REGNUM before the dummy frame was pushed. These
335 two meanings would be incompatible for the 29k if we didn't define
336 CANNOT_EXECUTE_STACK (but we do, so don't worry about it).
337 Also note that "lr1" below, while called a frame pointer
338 in the user's guide, has only one function: To determine whether
339 registers need to be filled in the function epilogue.
344 bar: sub gr1,gr1,rsize_b
351 foo: sub gr1,gr1,rsize_f
356 loc3: < suppose the inferior stops here >
358 memory stack register stack
361 +------->|___________| | | ^
362 | | ^ | | locals_b | |
363 | | | | |____________| |
364 | | | | | | | rsize_b
365 | | | msize_b | | args_to_f | |
366 | | | | |____________| |
367 | | | | |____lr1_____| V
368 | | V | |____loc2____|<----------------+
369 | +--->|___________|<---------mfp | ^ |
370 | | | ^ | | locals_f | | |
371 | | | | msize_f | |____________| | |
372 | | | | | | | | rsize_f |
373 | | | V | | args | | |
374 | | |___________|<msp |____________| | |
375 | | |_____lr1____| V |
376 | | |___garbage__| <- gr1 <----+ |
383 | | |_________________| | |
384 | | |rsize=rsize_b | | |
385 | | |msize=msize_b | | |
386 +---|--------saved_msp | | |
387 | |frame------------------------------------|---+
389 | |_________________| |
392 +--------saved_msp | |
393 |frame------------------------------------+
397 So, is that sufficiently confusing? Welcome to the 29000.
399 * The frame for foo uses a memory frame pointer but the frame for
400 bar does not. In the latter case the saved_msp is
401 computed by adding msize to the saved_msp of the
403 * msize is in the frame cache only for high C's sake. */
405 void read_register_stack ();
406 long read_register_stack_integer ();
408 #define EXTRA_FRAME_INFO \
409 CORE_ADDR saved_msp; \
410 unsigned int rsize; \
413 /* Because INIT_FRAME_PC gets passed fromleaf, that's where we init
414 not only ->pc and ->frame, but all the extra stuff, when called from
415 get_prev_frame_info, that is. */
416 #define INIT_EXTRA_FRAME_INFO(fci) \
417 init_extra_frame_info(fci);
418 void init_extra_frame_info ();
419 #define INIT_FRAME_PC(fromleaf, fci) \
420 init_frame_pc(fromleaf, fci);
421 void init_frame_pc ();
423 /* FRAME_CHAIN takes a FRAME
424 and produces the frame's chain-pointer.
426 FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
427 and produces the nominal address of the caller frame.
429 However, if FRAME_CHAIN_VALID returns zero,
430 it means the given frame is the outermost one and has no caller.
431 In that case, FRAME_CHAIN_COMBINE is not used. */
433 /* On the 29k, the nominal address of a frame is the address on the
434 register stack of the return address (the one next to the incoming
435 arguments, not down at the bottom so nominal address == stack pointer).
437 GDB expects "nominal address" to equal contents of FP_REGNUM,
438 at least when it comes time to create the innermost frame.
439 However, that doesn't work for us, so when creating the innermost
440 frame we set ->frame ourselves in INIT_EXTRA_FRAME_INFO. */
442 /* These are mostly dummies for the 29k because INIT_FRAME_PC
443 sets prev->frame instead. */
444 #define FRAME_CHAIN(thisframe) (0)
446 /* Not sure how to figure out where the bottom frame is. There is
447 no frame for start. In my tests so far the
448 pc has been outside the text segment, though, so check for that.
449 However, allow a pc in a call dummy. */
450 #define FRAME_CHAIN_VALID(chain, thisframe) \
451 (outside_startup_file (FRAME_SAVED_PC (thisframe)) \
452 && FRAME_SAVED_PC (thisframe) >= text_start \
453 && FRAME_SAVED_PC (thisframe) < text_end + CALL_DUMMY_LENGTH)
455 #define FRAME_CHAIN_COMBINE(chain, thisframe) (0)
457 /* Define other aspects of the stack frame. */
459 /* A macro that tells us whether the function invocation represented
460 by FI does not have a frame on the stack associated with it. If it
461 does not, FRAMELESS is set to 1, else 0. */
462 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
463 (FRAMELESS) = frameless_look_for_prologue(FI)
465 /* Saved pc (i.e. return address). */
466 #define FRAME_SAVED_PC(fraim) \
467 (read_register_stack_integer ((fraim)->frame + (fraim)->rsize, 4))
469 /* Local variables (i.e. LOC_LOCAL) are on the memory stack, with their
470 offsets being relative to the memory stack pointer (high C) or
473 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address (fi)
474 extern CORE_ADDR
frame_locals_address ();
476 /* Return number of args passed to a frame.
477 Can return -1, meaning no way to tell. */
478 /* While we could go the effort of finding the tags word and getting
479 the argcount field from it,
480 (1) It only counts arguments in registers, i.e. the first 16 words
482 (2) It gives the number of arguments the function was declared with
483 not how many it was called with (or some variation, like all 16
484 words for varadic functions). This makes argcount pretty much
485 redundant with -g info, even for varadic functions.
487 #define FRAME_NUM_ARGS(numargs, fi) ((numargs) = -1)
489 #define FRAME_ARGS_ADDRESS(fi) FRAME_LOCALS_ADDRESS (fi)
491 /* Return number of bytes at start of arglist that are not really args. */
493 #define FRAME_ARGS_SKIP 0
495 /* Provide our own get_saved_register. HAVE_REGISTER_WINDOWS is insufficient
496 because registers get renumbered on the 29k without getting saved. */
498 #define GET_SAVED_REGISTER
500 /* Call function stuff. */
502 /* The dummy frame looks like this (see also the general frame picture
507 | | frame for function
508 | locals_sproc | executing at time
509 |________________| of call_function.
510 | | We must not disturb
511 | args_out_sproc | it.
512 memory stack |________________|
514 | | |__retaddr_sproc_| <- gr1 (at start)
515 |____________|<-msp 0 <-----------mfp_dummy_____|
517 | arg_slop | | saved regs |
518 | (16 words) | | gr96-gr124 |
519 |____________|<-msp 1--after | sr128-sr135 |
520 | | PUSH_DUMMY_FRAME| |
521 | struct ret | |________________|
523 |____________|<- lrp | args_out_dummy |
524 | struct ret | | (16 words) |
525 | 16 | |________________|
526 | (16 words) | |____lr1_dummy___|
527 |____________|<- msp 2--after |_retaddr_dummy__|<- gr1 after
528 | | struct ret | | PUSH_DUMMY_FRAME
529 | margs17+ | area allocated | locals_inf |
530 | | |________________| called
531 |____________|<- msp 4--when | | function's
532 | | inf called | args_out_inf | frame (set up
533 | margs16 | |________________| by called
534 | (16 words) | |_____lr1_inf____| function).
535 |____________|<- msp 3--after | . |
536 | | args pushed | . |
540 arg_slop: This area is so that when the call dummy adds 16 words to
541 the msp, it won't end up larger than mfp_dummy (it is needed in the
542 case where margs and struct_ret do not add up to at least 16 words).
543 struct ret: This area is allocated by GDB if the return value is more
544 than 16 words. struct ret_16 is not used on the 29k.
545 margs: Pushed by GDB. The call dummy copies the first 16 words to
547 retaddr_sproc: Contains the PC at the time we call the function.
548 set by PUSH_DUMMY_FRAME and read by POP_FRAME.
549 retaddr_dummy: This points to a breakpoint instruction in the dummy. */
551 /* Rsize for dummy frame, in bytes. */
553 /* Bytes for outgoing args, lr1, and retaddr. */
554 #define DUMMY_ARG (2 * 4 + 16 * 4)
556 /* Number of special registers (sr128-) to save. */
557 #define DUMMY_SAVE_SR128 8
558 /* Number of general (gr96-) registers to save. */
559 #define DUMMY_SAVE_GR96 29
561 #define DUMMY_FRAME_RSIZE \
563 + DUMMY_SAVE_GR96 * 4 \
564 + DUMMY_SAVE_SR128 * 4 \
568 /* Push an empty stack frame, to record the current PC, etc. */
570 #define PUSH_DUMMY_FRAME push_dummy_frame();
571 extern void push_dummy_frame ();
573 /* Discard from the stack the innermost frame,
574 restoring all saved registers. */
576 #define POP_FRAME pop_frame ();
577 extern void pop_frame ();
579 /* This sequence of words is the instructions
581 loadm 0, 0, lr2, msp ; load first 16 words of arguments into registers
582 add msp, msp, 16 * 4 ; point to the remaining arguments
587 aseq 0x40,gr1,gr1 ; nop
588 asneq 0x50,gr1,gr1 ; breakpoint
591 /* Position of the "const" instruction within CALL_DUMMY in bytes. */
592 #define CONST_INSN (3 * 4)
593 #if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
594 #define CALL_DUMMY {0x0400870f, 0x3600827d, 0x157d7d40, 0x03ff60ff, \
595 0x02ff60ff, 0xc8008060, 0x70400101, 0x72500101}
596 #else /* Byte order differs. */
598 #endif /* Byte order differs. */
599 #define CALL_DUMMY_LENGTH (8 * 4)
601 #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
603 /* Helper macro for FIX_CALL_DUMMY. WORDP is a long * which points to a
604 word in target byte order; bits 0-7 and 16-23 of *WORDP are replaced with
605 bits 0-7 and 8-15 of DATA (which is in host byte order). */
607 #if TARGET_BYTE_ORDER == BIG_ENDIAN
608 #define STUFF_I16(WORDP, DATA) \
610 *((char *)(WORDP) + 3) = ((DATA) & 0xff);\
611 *((char *)(WORDP) + 1) = (((DATA) >> 8) & 0xff);\
613 #else /* Target is little endian. */
614 #define STUFF_I16(WORDP, DATA) \
616 *(char *)(WORDP
) = ((DATA
) & 0xff);
617 *((char *)(WORDP
) + 2) = (((DATA
) >> 8) & 0xff);
619 #endif /* Target is little endian. */
621 /* Insert the specified number of args and function address
622 into a call sequence of the above form stored at DUMMYNAME. */
624 /* Currently this stuffs in the address of the function that we are calling.
625 If different 29k systems use different breakpoint instructions, it
626 could also stuff BREAKPOINT in the right place (to avoid having to
627 duplicate CALL_DUMMY in each tm-*.h file). */
629 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
631 STUFF_I16((char *)dummyname + CONST_INSN, fun);\
632 STUFF_I16((char *)dummyname + CONST_INSN + 4, fun >> 16);\
635 /* At least our 29k board has separate data & instruction memories and can't
636 execute the data memory. Also, there should be space after text_end;
637 we won't get a SIGSEGV or scribble on data space. */
639 #define CALL_DUMMY_LOCATION AFTER_TEXT_END
641 /* How to translate register numbers in the .stab's into gdb's internal register
642 numbers. We don't translate them, but we warn if an invalid register
643 number is seen. Note that FIXME, we use the value "sym" as an implicit
644 argument in printing the error message. It happens to be available where
645 this macro is used. (This macro definition appeared in a late revision
646 of gdb-3.91.6 and is not well tested. Also, it should be a "complaint".) */
648 #define STAB_REG_TO_REGNUM(num) \
649 (((num) > LR0_REGNUM + 127) \
651 "Invalid register number %d in symbol table entry for %s\n", \
652 (num), SYMBOL_NAME (sym)), (num) \
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