1 /* Definitions to make GDB run on a mips box under 4.3bsd.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995
3 Free Software Foundation, Inc.
4 Contributed by Per Bothner (bothner@cs.wisc.edu) at U.Wisconsin
5 and by Alessandro Forin (af@cs.cmu.edu) at CMU..
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, Boston, MA 02111-1307, USA. */
34 #include "coff/sym.h" /* Needed for PDR below. */
35 #include "coff/symconst.h"
37 #if !defined (TARGET_BYTE_ORDER_DEFAULT)
38 #define TARGET_BYTE_ORDER_DEFAULT LITTLE_ENDIAN
41 #if !defined (GDB_TARGET_IS_MIPS64)
42 #define GDB_TARGET_IS_MIPS64 0
45 #if !defined (MIPS_EABI)
49 #if !defined (TARGET_MONITOR_PROMPT)
50 #define TARGET_MONITOR_PROMPT "<IDT>"
53 /* PC should be masked to remove possible MIPS16 flag */
54 #if !defined (GDB_TARGET_MASK_DISAS_PC)
55 #define GDB_TARGET_MASK_DISAS_PC(addr) UNMAKE_MIPS16_ADDR(addr)
57 #if !defined (GDB_TARGET_UNMASK_DISAS_PC)
58 #define GDB_TARGET_UNMASK_DISAS_PC(addr) MAKE_MIPS16_ADDR(addr)
61 /* Floating point is IEEE compliant */
64 /* The name of the usual type of MIPS processor that is in the target
67 #define DEFAULT_MIPS_TYPE "generic"
69 /* Remove useless bits from an instruction address. */
71 #define ADDR_BITS_REMOVE(addr) mips_addr_bits_remove(addr)
72 CORE_ADDR mips_addr_bits_remove
PARAMS ((CORE_ADDR addr
));
74 /* Remove useless bits from the stack pointer. */
76 #define TARGET_READ_SP() ADDR_BITS_REMOVE (read_register (SP_REGNUM))
78 /* Offset from address of function to start of its code.
79 Zero on most machines. */
81 #define FUNCTION_START_OFFSET 0
83 /* Advance PC across any function entry prologue instructions
84 to reach some "real" code. */
86 #define SKIP_PROLOGUE(pc) (mips_skip_prologue (pc, 0))
87 extern CORE_ADDR mips_skip_prologue
PARAMS ((CORE_ADDR addr
, int lenient
));
89 /* Return non-zero if PC points to an instruction which will cause a step
90 to execute both the instruction at PC and an instruction at PC+4. */
91 extern int mips_step_skips_delay
PARAMS ((CORE_ADDR
));
92 #define STEP_SKIPS_DELAY_P (1)
93 #define STEP_SKIPS_DELAY(pc) (mips_step_skips_delay (pc))
95 /* Immediately after a function call, return the saved pc.
96 Can't always go through the frames for this because on some machines
97 the new frame is not set up until the new function executes
100 #define SAVED_PC_AFTER_CALL(frame) read_register(RA_REGNUM)
102 /* Are we currently handling a signal */
104 extern int in_sigtramp
PARAMS ((CORE_ADDR
, char *));
105 #define IN_SIGTRAMP(pc, name) in_sigtramp(pc, name)
107 /* Stack grows downward. */
109 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
111 #define BIG_ENDIAN 4321
113 /* BREAKPOINT_FROM_PC uses the program counter value to determine whether a
114 16- or 32-bit breakpoint should be used. It returns a pointer
115 to a string of bytes that encode a breakpoint instruction, stores
116 the length of the string to *lenptr, and adjusts the pc (if necessary) to
117 point to the actual memory location where the breakpoint should be
120 extern breakpoint_from_pc_fn mips_breakpoint_from_pc
;
121 #define BREAKPOINT_FROM_PC(pcptr, lenptr) mips_breakpoint_from_pc(pcptr, lenptr)
123 /* Amount PC must be decremented by after a breakpoint.
124 This is often the number of bytes in BREAKPOINT
127 #define DECR_PC_AFTER_BREAK 0
129 /* Say how long (ordinary) registers are. This is a piece of bogosity
130 used in push_word and a few other places; REGISTER_RAW_SIZE is the
131 real way to know how big a register is. */
133 #define REGISTER_SIZE 4
135 /* The size of a register. This is predefined in tm-mips64.h. We
136 can't use REGISTER_SIZE because that is used for various other
140 #define MIPS_REGSIZE 4
143 /* The sizes of floating point registers. */
145 #define MIPS_FPU_SINGLE_REGSIZE 4
146 #define MIPS_FPU_DOUBLE_REGSIZE 8
148 /* Number of machine registers */
154 /* Initializer for an array of names of registers.
155 There should be NUM_REGS strings in this initializer. */
157 #ifndef REGISTER_NAMES
158 #define REGISTER_NAMES \
159 { "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", \
160 "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", \
161 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \
162 "t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra", \
163 "sr", "lo", "hi", "bad", "cause","pc", \
164 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
165 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
166 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\
167 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",\
168 "fsr", "fir", "fp", "", \
169 "", "", "", "", "", "", "", "", \
170 "", "", "", "", "", "", "", "", \
174 /* Register numbers of various important registers.
175 Note that some of these values are "real" register numbers,
176 and correspond to the general registers of the machine,
177 and some are "phony" register numbers which are too large
178 to be actual register numbers as far as the user is concerned
179 but do serve to get the desired values when passed to read_register. */
181 #define ZERO_REGNUM 0 /* read-only register, always 0 */
182 #define V0_REGNUM 2 /* Function integer return value */
183 #define A0_REGNUM 4 /* Loc of first arg during a subr call */
185 # define MIPS_LAST_ARG_REGNUM 11 /* EABI uses R4 through R11 for args */
186 # define MIPS_NUM_ARG_REGS 8
188 # define MIPS_LAST_ARG_REGNUM 7 /* old ABI uses R4 through R7 for args */
189 # define MIPS_NUM_ARG_REGS 4
191 #define T9_REGNUM 25 /* Contains address of callee in PIC */
192 #define SP_REGNUM 29 /* Contains address of top of stack */
193 #define RA_REGNUM 31 /* Contains return address value */
194 #define PS_REGNUM 32 /* Contains processor status */
195 #define HI_REGNUM 34 /* Multiple/divide temp */
196 #define LO_REGNUM 33 /* ... */
197 #define BADVADDR_REGNUM 35 /* bad vaddr for addressing exception */
198 #define CAUSE_REGNUM 36 /* describes last exception */
199 #define PC_REGNUM 37 /* Contains program counter */
200 #define FP0_REGNUM 38 /* Floating point register 0 (single float) */
201 #define FPA0_REGNUM (FP0_REGNUM+12) /* First float argument register */
202 #if MIPS_EABI /* EABI uses F12 through F19 for args */
203 # define MIPS_LAST_FP_ARG_REGNUM (FP0_REGNUM+19)
204 # define MIPS_NUM_FP_ARG_REGS 8
205 #else /* old ABI uses F12 through F15 for args */
206 # define MIPS_LAST_FP_ARG_REGNUM (FP0_REGNUM+15)
207 # define MIPS_NUM_FP_ARG_REGS 4
209 #define FCRCS_REGNUM 70 /* FP control/status */
210 #define FCRIR_REGNUM 71 /* FP implementation/revision */
211 #define FP_REGNUM 72 /* Pseudo register that contains true address of executing stack frame */
212 #define UNUSED_REGNUM 73 /* Never used, FIXME */
213 #define FIRST_EMBED_REGNUM 74 /* First CP0 register for embedded use */
214 #define PRID_REGNUM 89 /* Processor ID */
215 #define LAST_EMBED_REGNUM 89 /* Last one */
217 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
218 of register dumps. */
220 #define DO_REGISTERS_INFO(_regnum, fp) mips_do_registers_info(_regnum, fp)
221 extern void mips_do_registers_info
PARAMS ((int, int));
223 /* Total amount of space needed to store our copies of the machine's
224 register state, the array `registers'. */
226 #define REGISTER_BYTES (NUM_REGS*MIPS_REGSIZE)
228 /* Index within `registers' of the first byte of the space for
231 #define REGISTER_BYTE(N) ((N) * MIPS_REGSIZE)
233 /* Number of bytes of storage in the actual machine representation
236 #define REGISTER_RAW_SIZE(N) REGISTER_VIRTUAL_SIZE(N)
238 /* Number of bytes of storage in the program's representation
241 #define REGISTER_VIRTUAL_SIZE(N) TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (N))
243 /* Largest value REGISTER_RAW_SIZE can have. */
245 #define MAX_REGISTER_RAW_SIZE 8
247 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
249 #define MAX_REGISTER_VIRTUAL_SIZE 8
251 /* Return the GDB type object for the "standard" data type of data in
254 #ifndef REGISTER_VIRTUAL_TYPE
255 #define REGISTER_VIRTUAL_TYPE(N) \
256 (((N) >= FP0_REGNUM && (N) < FP0_REGNUM+32) ? builtin_type_float \
257 : ((N) == 32 /*SR*/) ? builtin_type_uint32 \
258 : ((N) >= 70 && (N) <= 89) ? builtin_type_uint32 \
262 /* All mips targets store doubles in a register pair with the least
263 significant register in the lower numbered register.
264 If the target is big endian, double register values need conversion
265 between memory and register formats. */
267 #define REGISTER_CONVERT_TO_TYPE(n, type, buffer) \
268 do {if (TARGET_BYTE_ORDER == BIG_ENDIAN \
269 && REGISTER_RAW_SIZE (n) == 4 \
270 && (n) >= FP0_REGNUM && (n) < FP0_REGNUM + 32 \
271 && TYPE_CODE(type) == TYPE_CODE_FLT \
272 && TYPE_LENGTH(type) == 8) { \
274 memcpy (__temp, ((char *)(buffer))+4, 4); \
275 memcpy (((char *)(buffer))+4, (buffer), 4); \
276 memcpy (((char *)(buffer)), __temp, 4); }} while (0)
278 #define REGISTER_CONVERT_FROM_TYPE(n, type, buffer) \
279 do {if (TARGET_BYTE_ORDER == BIG_ENDIAN \
280 && REGISTER_RAW_SIZE (n) == 4 \
281 && (n) >= FP0_REGNUM && (n) < FP0_REGNUM + 32 \
282 && TYPE_CODE(type) == TYPE_CODE_FLT \
283 && TYPE_LENGTH(type) == 8) { \
285 memcpy (__temp, ((char *)(buffer))+4, 4); \
286 memcpy (((char *)(buffer))+4, (buffer), 4); \
287 memcpy (((char *)(buffer)), __temp, 4); }} while (0)
289 /* Store the address of the place in which to copy the structure the
290 subroutine will return. Handled by mips_push_arguments. */
292 #define STORE_STRUCT_RETURN(addr, sp) /**/
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,
296 into VALBUF. XXX floats */
298 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
299 mips_extract_return_value(TYPE, REGBUF, VALBUF)
301 mips_extract_return_value
PARAMS ((struct type
*, char [], char *));
303 /* Write into appropriate registers a function return value
304 of type TYPE, given in virtual format. */
306 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
307 mips_store_return_value(TYPE, VALBUF)
308 extern void mips_store_return_value
PARAMS ((struct type
*, char *));
310 /* Extract from an array REGBUF containing the (raw) register state
311 the address in which a function should return its structure value,
312 as a CORE_ADDR (or an expression that can be used as one). */
313 /* The address is passed in a0 upon entry to the function, but when
314 the function exits, the compiler has copied the value to v0. This
315 convention is specified by the System V ABI, so I think we can rely
318 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
319 (extract_address (REGBUF + REGISTER_BYTE (V0_REGNUM), \
320 REGISTER_RAW_SIZE (V0_REGNUM)))
322 extern use_struct_convention_fn mips_use_struct_convention
;
323 #define USE_STRUCT_CONVENTION(gcc_p, type) mips_use_struct_convention (gcc_p, type)
325 /* Describe the pointer in each stack frame to the previous stack frame
328 /* FRAME_CHAIN takes a frame's nominal address
329 and produces the frame's chain-pointer. */
331 #define FRAME_CHAIN(thisframe) (CORE_ADDR) mips_frame_chain (thisframe)
332 extern CORE_ADDR mips_frame_chain
PARAMS ((struct frame_info
*));
334 /* Define other aspects of the stack frame. */
337 /* A macro that tells us whether the function invocation represented
338 by FI does not have a frame on the stack associated with it. If it
339 does not, FRAMELESS is set to 1, else 0. */
340 /* We handle this differently for mips, and maybe we should not */
342 #define FRAMELESS_FUNCTION_INVOCATION(FI) (0)
346 #define FRAME_SAVED_PC(FRAME) (mips_frame_saved_pc(FRAME))
347 extern CORE_ADDR mips_frame_saved_pc
PARAMS ((struct frame_info
*));
349 #define FRAME_ARGS_ADDRESS(fi) (fi)->frame
351 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
353 /* Return number of args passed to a frame.
354 Can return -1, meaning no way to tell. */
356 #define FRAME_NUM_ARGS(fi) (mips_frame_num_args(fi))
357 extern int mips_frame_num_args
PARAMS ((struct frame_info
*));
359 /* Return number of bytes at start of arglist that are not really args. */
361 #define FRAME_ARGS_SKIP 0
363 /* Put here the code to store, into a struct frame_saved_regs,
364 the addresses of the saved registers of frame described by FRAME_INFO.
365 This includes special registers such as pc and fp saved in special
366 ways in the stack frame. sp is even more special:
367 the address we return for it IS the sp for the next frame. */
369 #define FRAME_INIT_SAVED_REGS(frame_info) \
371 if ((frame_info)->saved_regs == NULL) \
372 mips_find_saved_regs (frame_info); \
373 (frame_info)->saved_regs[SP_REGNUM] = (frame_info)->frame; \
375 extern void mips_find_saved_regs
PARAMS ((struct frame_info
*));
378 /* Things needed for making the inferior call functions. */
380 /* Stack must be aligned on 32-bit boundaries when synthesizing
381 function calls. We don't need STACK_ALIGN, PUSH_ARGUMENTS will
384 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
385 (mips_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr)))
387 mips_push_arguments
PARAMS ((int, struct value
**, CORE_ADDR
, int, CORE_ADDR
));
389 /* Push an empty stack frame, to record the current PC, etc. */
391 #define PUSH_DUMMY_FRAME mips_push_dummy_frame()
392 extern void mips_push_dummy_frame
PARAMS ((void));
394 /* Discard from the stack the innermost frame, restoring all registers. */
396 #define POP_FRAME mips_pop_frame()
397 extern void mips_pop_frame
PARAMS ((void));
399 #define CALL_DUMMY { 0 }
401 #define CALL_DUMMY_START_OFFSET (0)
403 #define CALL_DUMMY_BREAKPOINT_OFFSET (0)
405 /* On Irix, $t9 ($25) contains the address of the callee (used for PIC).
406 It doesn't hurt to do this on other systems; $t9 will be ignored. */
407 #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p) \
408 write_register(T9_REGNUM, fun)
410 #define CALL_DUMMY_LOCATION AT_ENTRY_POINT
412 #define CALL_DUMMY_ADDRESS() (mips_call_dummy_address ())
413 extern CORE_ADDR mips_call_dummy_address
PARAMS ((void));
415 /* There's a mess in stack frame creation. See comments in blockframe.c
416 near reference to INIT_FRAME_PC_FIRST. */
418 #define INIT_FRAME_PC(fromleaf, prev) /* nada */
420 #define INIT_FRAME_PC_FIRST(fromleaf, prev) \
421 mips_init_frame_pc_first(fromleaf, prev)
422 extern void mips_init_frame_pc_first
PARAMS ((int, struct frame_info
*));
424 /* Special symbol found in blocks associated with routines. We can hang
425 mips_extra_func_info_t's off of this. */
427 #define MIPS_EFI_SYMBOL_NAME "__GDB_EFI_INFO__"
428 extern void ecoff_relocate_efi
PARAMS ((struct symbol
*, CORE_ADDR
));
430 /* Specific information about a procedure.
431 This overlays the MIPS's PDR records,
432 mipsread.c (ab)uses this to save memory */
434 typedef struct mips_extra_func_info
{
435 long numargs
; /* number of args to procedure (was iopt) */
436 bfd_vma high_addr
; /* upper address bound */
437 long frame_adjust
; /* offset of FP from SP (used on MIPS16) */
438 PDR pdr
; /* Procedure descriptor record */
439 } *mips_extra_func_info_t
;
441 #define EXTRA_FRAME_INFO \
442 mips_extra_func_info_t proc_desc; \
445 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)
446 extern void init_extra_frame_info
PARAMS ((struct frame_info
*));
448 #define PRINT_EXTRA_FRAME_INFO(fi) \
450 if (fi && fi->proc_desc && fi->proc_desc->pdr.framereg < NUM_REGS) \
451 printf_filtered (" frame pointer is at %s+%d\n", \
452 REGISTER_NAME (fi->proc_desc->pdr.framereg), \
453 fi->proc_desc->pdr.frameoffset); \
456 /* It takes two values to specify a frame on the MIPS.
458 In fact, the *PC* is the primary value that sets up a frame. The
459 PC is looked up to see what function it's in; symbol information
460 from that function tells us which register is the frame pointer
461 base, and what offset from there is the "virtual frame pointer".
462 (This is usually an offset from SP.) On most non-MIPS machines,
463 the primary value is the SP, and the PC, if needed, disambiguates
464 multiple functions with the same SP. But on the MIPS we can't do
465 that since the PC is not stored in the same part of the frame every
466 time. This does not seem to be a very clever way to set up frames,
467 but there is nothing we can do about that). */
469 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
470 extern struct frame_info
*setup_arbitrary_frame
PARAMS ((int, CORE_ADDR
*));
472 /* Convert a dbx stab register number (from `r' declaration) to a gdb REGNUM */
474 #define STAB_REG_TO_REGNUM(num) ((num) < 32 ? (num) : (num)+FP0_REGNUM-38)
476 /* Convert a ecoff register number to a gdb REGNUM */
478 #define ECOFF_REG_TO_REGNUM(num) ((num) < 32 ? (num) : (num)+FP0_REGNUM-32)
480 /* If the current gcc for for this target does not produce correct debugging
481 information for float parameters, both prototyped and unprototyped, then
482 define this macro. This forces gdb to always assume that floats are
483 passed as doubles and then converted in the callee.
485 For the mips chip, it appears that the debug info marks the parameters as
486 floats regardless of whether the function is prototyped, but the actual
487 values are passed as doubles for the non-prototyped case and floats for
488 the prototyped case. Thus we choose to make the non-prototyped case work
489 for C and break the prototyped case, since the non-prototyped case is
490 probably much more common. (FIXME). */
492 #define COERCE_FLOAT_TO_DOUBLE (current_language -> la_language == language_c)
494 /* Select the default mips disassembler */
496 #define TM_PRINT_INSN_MACH 0
499 /* These are defined in mdebugread.c and are used in mips-tdep.c */
500 extern CORE_ADDR sigtramp_address
, sigtramp_end
;
501 extern void fixup_sigtramp
PARAMS ((void));
503 /* Defined in mips-tdep.c and used in remote-mips.c */
504 extern char *mips_read_processor_type
PARAMS ((void));
506 /* Functions for dealing with MIPS16 call and return stubs. */
507 #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) mips_in_call_stub (pc, name)
508 #define IN_SOLIB_RETURN_TRAMPOLINE(pc, name) mips_in_return_stub (pc, name)
509 #define SKIP_TRAMPOLINE_CODE(pc) mips_skip_stub (pc)
510 #define IGNORE_HELPER_CALL(pc) mips_ignore_helper (pc)
511 extern int mips_in_call_stub
PARAMS ((CORE_ADDR pc
, char *name
));
512 extern int mips_in_return_stub
PARAMS ((CORE_ADDR pc
, char *name
));
513 extern CORE_ADDR mips_skip_stub
PARAMS ((CORE_ADDR pc
));
514 extern int mips_ignore_helper
PARAMS ((CORE_ADDR pc
));
520 /* Definitions and declarations used by mips-tdep.c and remote-mips.c */
521 #define MIPS_INSTLEN 4 /* Length of an instruction */
522 #define MIPS16_INSTLEN 2 /* Length of an instruction on MIPS16*/
523 #define MIPS_NUMREGS 32 /* Number of integer or float registers */
524 typedef unsigned long t_inst
; /* Integer big enough to hold an instruction */
526 /* MIPS16 function addresses are odd (bit 0 is set). Here are some
527 macros to test, set, or clear bit 0 of addresses. */
528 #define IS_MIPS16_ADDR(addr) ((addr) & 1)
529 #define MAKE_MIPS16_ADDR(addr) ((addr) | 1)
530 #define UNMAKE_MIPS16_ADDR(addr) ((addr) & ~1)
532 #endif /* TM_MIPS_H */
534 /* Macros for setting and testing a bit in a minimal symbol that
535 marks it as 16-bit function. The MSB of the minimal symbol's
536 "info" field is used for this purpose. This field is already
537 being used to store the symbol size, so the assumption is
538 that the symbol size cannot exceed 2^31.
540 ELF_MAKE_MSYMBOL_SPECIAL
541 tests whether an ELF symbol is "special", i.e. refers
542 to a 16-bit function, and sets a "special" bit in a
543 minimal symbol to mark it as a 16-bit function
544 MSYMBOL_IS_SPECIAL tests the "special" bit in a minimal symbol
545 MSYMBOL_SIZE returns the size of the minimal symbol, i.e.
546 the "info" field with the "special" bit masked out
549 #define ELF_MAKE_MSYMBOL_SPECIAL(sym,msym) \
551 if (((elf_symbol_type *)(sym))->internal_elf_sym.st_other == STO_MIPS16) { \
552 MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) | 0x80000000); \
553 SYMBOL_VALUE_ADDRESS (msym) |= 1; \
557 #define MSYMBOL_IS_SPECIAL(msym) \
558 (((long) MSYMBOL_INFO (msym) & 0x80000000) != 0)
559 #define MSYMBOL_SIZE(msym) \
560 ((long) MSYMBOL_INFO (msym) & 0x7fffffff)