1 /* Definitions to make GDB run on a mips box under 4.3bsd.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 Free Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
28 #define GDB_MULTI_ARCH 1
38 #include "coff/sym.h" /* Needed for PDR below. */
39 #include "coff/symconst.h"
41 /* PC should be masked to remove possible MIPS16 flag */
42 #if !defined (GDB_TARGET_MASK_DISAS_PC)
43 #define GDB_TARGET_MASK_DISAS_PC(addr) UNMAKE_MIPS16_ADDR(addr)
45 #if !defined (GDB_TARGET_UNMASK_DISAS_PC)
46 #define GDB_TARGET_UNMASK_DISAS_PC(addr) MAKE_MIPS16_ADDR(addr)
49 /* The name of the usual type of MIPS processor that is in the target
52 #define DEFAULT_MIPS_TYPE "generic"
54 /* Offset from address of function to start of its code.
55 Zero on most machines. */
57 #define FUNCTION_START_OFFSET 0
59 /* Return non-zero if PC points to an instruction which will cause a step
60 to execute both the instruction at PC and an instruction at PC+4. */
61 extern int mips_step_skips_delay (CORE_ADDR);
62 #define STEP_SKIPS_DELAY_P (1)
63 #define STEP_SKIPS_DELAY(pc) (mips_step_skips_delay (pc))
65 /* Are we currently handling a signal */
67 extern int in_sigtramp (CORE_ADDR, char *);
68 #define IN_SIGTRAMP(pc, name) in_sigtramp(pc, name)
70 /* Say how long (ordinary) registers are. This is a piece of bogosity
71 used in push_word and a few other places; REGISTER_RAW_SIZE is the
72 real way to know how big a register is. */
74 #define REGISTER_SIZE 4
76 /* The size of a register. This is predefined in tm-mips64.h. We
77 can't use REGISTER_SIZE because that is used for various other
81 #define MIPS_REGSIZE 4
84 /* Number of machine registers */
90 /* Given the register index, return the name of the corresponding
92 extern const char *mips_register_name (int regnr);
93 #define REGISTER_NAME(i) mips_register_name (i)
95 /* Initializer for an array of names of registers.
96 There should be NUM_REGS strings in this initializer. */
98 #ifndef MIPS_REGISTER_NAMES
99 #define MIPS_REGISTER_NAMES \
100 { "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", \
101 "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", \
102 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \
103 "t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra", \
104 "sr", "lo", "hi", "bad", "cause","pc", \
105 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
106 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
107 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\
108 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",\
109 "fsr", "fir", "fp", "", \
110 "", "", "", "", "", "", "", "", \
111 "", "", "", "", "", "", "", "", \
115 /* Register numbers of various important registers.
116 Note that some of these values are "real" register numbers,
117 and correspond to the general registers of the machine,
118 and some are "phony" register numbers which are too large
119 to be actual register numbers as far as the user is concerned
120 but do serve to get the desired values when passed to read_register. */
122 #define ZERO_REGNUM 0 /* read-only register, always 0 */
123 #define V0_REGNUM 2 /* Function integer return value */
124 #define A0_REGNUM 4 /* Loc of first arg during a subr call */
125 #define T9_REGNUM 25 /* Contains address of callee in PIC */
126 #define SP_REGNUM 29 /* Contains address of top of stack */
127 #define RA_REGNUM 31 /* Contains return address value */
128 #define PS_REGNUM 32 /* Contains processor status */
129 #define HI_REGNUM 34 /* Multiple/divide temp */
130 #define LO_REGNUM 33 /* ... */
131 #define BADVADDR_REGNUM 35 /* bad vaddr for addressing exception */
132 #define CAUSE_REGNUM 36 /* describes last exception */
133 #define PC_REGNUM 37 /* Contains program counter */
134 #define FP0_REGNUM 38 /* Floating point register 0 (single float) */
135 #define FPA0_REGNUM (FP0_REGNUM+12) /* First float argument register */
136 #define FCRCS_REGNUM 70 /* FP control/status */
137 #define FCRIR_REGNUM 71 /* FP implementation/revision */
138 #define FP_REGNUM 72 /* Pseudo register that contains true address of executing stack frame */
139 #define UNUSED_REGNUM 73 /* Never used, FIXME */
140 #define FIRST_EMBED_REGNUM 74 /* First CP0 register for embedded use */
141 #define PRID_REGNUM 89 /* Processor ID */
142 #define LAST_EMBED_REGNUM 89 /* Last one */
144 /* Total amount of space needed to store our copies of the machine's
145 register state, the array `registers'. */
147 #define REGISTER_BYTES (NUM_REGS*MIPS_REGSIZE)
149 /* Index within `registers' of the first byte of the space for
152 #define REGISTER_BYTE(N) ((N) * MIPS_REGSIZE)
154 /* Number of bytes of storage in the program's representation
157 #define REGISTER_VIRTUAL_SIZE(N) TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (N))
159 /* Return the GDB type object for the "standard" data type of data in
162 #ifndef REGISTER_VIRTUAL_TYPE
163 #define REGISTER_VIRTUAL_TYPE(N) \
164 (((N) >= FP0_REGNUM && (N) < FP0_REGNUM+32) ? builtin_type_float \
165 : ((N) == 32 /*SR*/) ? builtin_type_uint32 \
166 : ((N) >= 70 && (N) <= 89) ? builtin_type_uint32 \
170 /* All mips targets store doubles in a register pair with the least
171 significant register in the lower numbered register.
172 If the target is big endian, double register values need conversion
173 between memory and register formats. */
175 #define REGISTER_CONVERT_TO_TYPE(n, type, buffer) \
176 do {if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG \
177 && REGISTER_RAW_SIZE (n) == 4 \
178 && (n) >= FP0_REGNUM && (n) < FP0_REGNUM + 32 \
179 && TYPE_CODE(type) == TYPE_CODE_FLT \
180 && TYPE_LENGTH(type) == 8) { \
182 memcpy (__temp, ((char *)(buffer))+4, 4); \
183 memcpy (((char *)(buffer))+4, (buffer), 4); \
184 memcpy (((char *)(buffer)), __temp, 4); }} while (0)
186 #define REGISTER_CONVERT_FROM_TYPE(n, type, buffer) \
187 do {if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG \
188 && REGISTER_RAW_SIZE (n) == 4 \
189 && (n) >= FP0_REGNUM && (n) < FP0_REGNUM + 32 \
190 && TYPE_CODE(type) == TYPE_CODE_FLT \
191 && TYPE_LENGTH(type) == 8) { \
193 memcpy (__temp, ((char *)(buffer))+4, 4); \
194 memcpy (((char *)(buffer))+4, (buffer), 4); \
195 memcpy (((char *)(buffer)), __temp, 4); }} while (0)
197 /* Store the address of the place in which to copy the structure the
198 subroutine will return. Handled by mips_push_arguments. */
200 #define STORE_STRUCT_RETURN(addr, sp)
203 /* Extract from an array REGBUF containing the (raw) register state
204 a function return value of type TYPE, and copy that, in virtual format,
205 into VALBUF. XXX floats */
207 #define DEPRECATED_EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
208 mips_extract_return_value(TYPE, REGBUF, VALBUF)
209 extern void mips_extract_return_value (struct type *, char[], char *);
211 /* Write into appropriate registers a function return value
212 of type TYPE, given in virtual format. */
214 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
215 mips_store_return_value(TYPE, VALBUF)
216 extern void mips_store_return_value (struct type *, char *);
218 /* Extract from an array REGBUF containing the (raw) register state
219 the address in which a function should return its structure value,
220 as a CORE_ADDR (or an expression that can be used as one). */
221 /* The address is passed in a0 upon entry to the function, but when
222 the function exits, the compiler has copied the value to v0. This
223 convention is specified by the System V ABI, so I think we can rely
226 #define DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
227 (extract_address (REGBUF + REGISTER_BYTE (V0_REGNUM), \
228 REGISTER_RAW_SIZE (V0_REGNUM)))
231 /* Describe the pointer in each stack frame to the previous stack frame
234 /* FRAME_CHAIN takes a frame's nominal address
235 and produces the frame's chain-pointer. */
237 #define FRAME_CHAIN(thisframe) (CORE_ADDR) mips_frame_chain (thisframe)
238 extern CORE_ADDR mips_frame_chain (struct frame_info *);
240 /* Define other aspects of the stack frame. */
243 /* A macro that tells us whether the function invocation represented
244 by FI does not have a frame on the stack associated with it. If it
245 does not, FRAMELESS is set to 1, else 0. */
246 /* We handle this differently for mips, and maybe we should not */
248 #define FRAMELESS_FUNCTION_INVOCATION(FI) (0)
252 #define FRAME_SAVED_PC(FRAME) (mips_frame_saved_pc(FRAME))
253 extern CORE_ADDR mips_frame_saved_pc (struct frame_info *);
255 #define FRAME_ARGS_ADDRESS(fi) (fi)->frame
257 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
259 /* Return number of args passed to a frame.
260 Can return -1, meaning no way to tell. */
262 #define FRAME_NUM_ARGS(fi) (mips_frame_num_args(fi))
263 extern int mips_frame_num_args (struct frame_info *);
265 /* Return number of bytes at start of arglist that are not really args. */
267 #define FRAME_ARGS_SKIP 0
271 /* Things needed for making the inferior call functions. */
273 /* Stack must be aligned on 32-bit boundaries when synthesizing
274 function calls. We don't need STACK_ALIGN, PUSH_ARGUMENTS will
277 extern CORE_ADDR mips_push_return_address (CORE_ADDR pc, CORE_ADDR sp);
278 #define PUSH_RETURN_ADDRESS(PC, SP) (mips_push_return_address ((PC), (SP)))
280 /* Push an empty stack frame, to record the current PC, etc. */
282 #define PUSH_DUMMY_FRAME mips_push_dummy_frame()
283 extern void mips_push_dummy_frame (void);
285 /* Discard from the stack the innermost frame, restoring all registers. */
287 #define POP_FRAME mips_pop_frame()
288 extern void mips_pop_frame (void);
290 #define CALL_DUMMY_START_OFFSET (0)
292 #define CALL_DUMMY_BREAKPOINT_OFFSET (0)
294 /* When calling functions on Irix 5 (or any MIPS SVR4 ABI compliant
295 platform), $t9 ($25) (Dest_Reg) contains the address of the callee
296 (used for PIC). It doesn't hurt to do this on other systems; $t9
298 #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p) \
299 write_register(T9_REGNUM, fun)
301 #define CALL_DUMMY_ADDRESS() (mips_call_dummy_address ())
302 extern CORE_ADDR mips_call_dummy_address (void);
304 /* Special symbol found in blocks associated with routines. We can hang
305 mips_extra_func_info_t's off of this. */
307 #define MIPS_EFI_SYMBOL_NAME "__GDB_EFI_INFO__"
308 extern void ecoff_relocate_efi (struct symbol *, CORE_ADDR);
310 /* Specific information about a procedure.
311 This overlays the MIPS's PDR records,
312 mipsread.c (ab)uses this to save memory */
314 typedef struct mips_extra_func_info
316 long numargs; /* number of args to procedure (was iopt) */
317 bfd_vma high_addr; /* upper address bound */
318 long frame_adjust; /* offset of FP from SP (used on MIPS16) */
319 PDR pdr; /* Procedure descriptor record */
321 *mips_extra_func_info_t;
323 extern void mips_init_extra_frame_info (int fromleaf, struct frame_info *);
324 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
325 mips_init_extra_frame_info(fromleaf, fci)
327 extern void mips_print_extra_frame_info (struct frame_info *frame);
328 #define PRINT_EXTRA_FRAME_INFO(fi) \
329 mips_print_extra_frame_info (fi)
331 /* It takes two values to specify a frame on the MIPS.
333 In fact, the *PC* is the primary value that sets up a frame. The
334 PC is looked up to see what function it's in; symbol information
335 from that function tells us which register is the frame pointer
336 base, and what offset from there is the "virtual frame pointer".
337 (This is usually an offset from SP.) On most non-MIPS machines,
338 the primary value is the SP, and the PC, if needed, disambiguates
339 multiple functions with the same SP. But on the MIPS we can't do
340 that since the PC is not stored in the same part of the frame every
341 time. This does not seem to be a very clever way to set up frames,
342 but there is nothing we can do about that. */
344 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
345 extern struct frame_info *setup_arbitrary_frame (int, CORE_ADDR *);
347 /* Select the default mips disassembler */
349 #define TM_PRINT_INSN_MACH 0
352 /* These are defined in mdebugread.c and are used in mips-tdep.c */
353 extern CORE_ADDR sigtramp_address, sigtramp_end;
354 extern void fixup_sigtramp (void);
356 /* Defined in mips-tdep.c and used in remote-mips.c */
357 extern char *mips_read_processor_type (void);
359 /* Functions for dealing with MIPS16 call and return stubs. */
360 #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) mips_in_call_stub (pc, name)
361 #define IN_SOLIB_RETURN_TRAMPOLINE(pc, name) mips_in_return_stub (pc, name)
362 #define SKIP_TRAMPOLINE_CODE(pc) mips_skip_stub (pc)
363 #define IGNORE_HELPER_CALL(pc) mips_ignore_helper (pc)
364 extern int mips_in_call_stub (CORE_ADDR pc, char *name);
365 extern int mips_in_return_stub (CORE_ADDR pc, char *name);
366 extern CORE_ADDR mips_skip_stub (CORE_ADDR pc);
367 extern int mips_ignore_helper (CORE_ADDR pc);
373 /* Definitions and declarations used by mips-tdep.c and remote-mips.c */
374 #define MIPS_INSTLEN 4 /* Length of an instruction */
375 #define MIPS16_INSTLEN 2 /* Length of an instruction on MIPS16 */
376 #define MIPS_NUMREGS 32 /* Number of integer or float registers */
377 typedef unsigned long t_inst; /* Integer big enough to hold an instruction */
379 /* MIPS16 function addresses are odd (bit 0 is set). Here are some
380 macros to test, set, or clear bit 0 of addresses. */
381 #define IS_MIPS16_ADDR(addr) ((addr) & 1)
382 #define MAKE_MIPS16_ADDR(addr) ((addr) | 1)
383 #define UNMAKE_MIPS16_ADDR(addr) ((addr) & ~1)
385 #endif /* TM_MIPS_H */
387 /* Macros for setting and testing a bit in a minimal symbol that
388 marks it as 16-bit function. The MSB of the minimal symbol's
389 "info" field is used for this purpose. This field is already
390 being used to store the symbol size, so the assumption is
391 that the symbol size cannot exceed 2^31.
393 ELF_MAKE_MSYMBOL_SPECIAL
394 tests whether an ELF symbol is "special", i.e. refers
395 to a 16-bit function, and sets a "special" bit in a
396 minimal symbol to mark it as a 16-bit function
397 MSYMBOL_IS_SPECIAL tests the "special" bit in a minimal symbol
398 MSYMBOL_SIZE returns the size of the minimal symbol, i.e.
399 the "info" field with the "special" bit masked out
402 #define ELF_MAKE_MSYMBOL_SPECIAL(sym,msym) \
404 if (((elf_symbol_type *)(sym))->internal_elf_sym.st_other == STO_MIPS16) { \
405 MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) | 0x80000000); \
406 SYMBOL_VALUE_ADDRESS (msym) |= 1; \
410 #define MSYMBOL_IS_SPECIAL(msym) \
411 (((long) MSYMBOL_INFO (msym) & 0x80000000) != 0)
412 #define MSYMBOL_SIZE(msym) \
413 ((long) MSYMBOL_INFO (msym) & 0x7fffffff)
416 /* Command to set the processor type. */
417 extern void mips_set_processor_type_command (char *, int);
420 /* Single step based on where the current instruction will take us. */
421 extern void mips_software_single_step (enum target_signal, int);