1 /* Definitions to make GDB target for an ARM
2 Copyright 1986-1989, 1991, 1993-1999 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 #ifdef __STDC__ /* Forward decls for prototypes */
25 #define TARGET_BYTE_ORDER_SELECTABLE
27 /* IEEE format floating point */
31 /* FIXME: may need a floatformat_ieee_double_bigbyte_littleword format for
32 BIG_ENDIAN use. -fnf */
34 #define TARGET_DOUBLE_FORMAT (target_byte_order == BIG_ENDIAN \
35 ? &floatformat_ieee_double_big \
36 : &floatformat_ieee_double_littlebyte_bigword)
38 /* When reading symbols, we need to zap the low bit of the address, which
39 may be set to 1 for Thumb functions. */
41 #define SMASH_TEXT_ADDRESS(addr) ((addr) &= ~0x1)
43 /* Remove useless bits from addresses in a running program. */
45 CORE_ADDR arm_addr_bits_remove
PARAMS ((CORE_ADDR
));
47 #define ADDR_BITS_REMOVE(val) (arm_addr_bits_remove (val))
49 /* Offset from address of function to start of its code.
50 Zero on most machines. */
52 #define FUNCTION_START_OFFSET 0
54 /* Advance PC across any function entry prologue instructions
55 to reach some "real" code. */
57 extern CORE_ADDR arm_skip_prologue
PARAMS ((CORE_ADDR pc
));
59 #define SKIP_PROLOGUE(pc) (arm_skip_prologue (pc))
61 /* Immediately after a function call, return the saved pc.
62 Can't always go through the frames for this because on some machines
63 the new frame is not set up until the new function executes
66 #define SAVED_PC_AFTER_CALL(frame) arm_saved_pc_after_call (frame)
68 extern CORE_ADDR arm_saved_pc_after_call
PARAMS ((struct frame_info
*));
70 /* I don't know the real values for these. */
71 #define TARGET_UPAGES UPAGES
72 #define TARGET_NBPG NBPG
74 /* Address of end of stack space. */
76 #define STACK_END_ADDR (0x01000000 - (TARGET_UPAGES * TARGET_NBPG))
78 /* Stack grows downward. */
80 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
82 /* !!!! if we're using RDP, then we're inserting breakpoints and storing
83 their handles instread of what was in memory. It is nice that
84 this is the same size as a handle - otherwise remote-rdp will
87 /* BREAKPOINT_FROM_PC uses the program counter value to determine whether a
88 16- or 32-bit breakpoint should be used. It returns a pointer
89 to a string of bytes that encode a breakpoint instruction, stores
90 the length of the string to *lenptr, and adjusts the pc (if necessary) to
91 point to the actual memory location where the breakpoint should be
94 extern breakpoint_from_pc_fn arm_breakpoint_from_pc
;
95 #define BREAKPOINT_FROM_PC(pcptr, lenptr) arm_breakpoint_from_pc (pcptr, lenptr)
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 0
103 /* code to execute to print interesting information about the
104 * floating point processor (if any)
105 * No need to define if there is nothing to do.
107 #define FLOAT_INFO { arm_float_info (); }
109 /* Say how long (ordinary) registers are. This is a piece of bogosity
110 used in push_word and a few other places; REGISTER_RAW_SIZE is the
111 real way to know how big a register is. */
113 #define REGISTER_SIZE 4
115 /* Number of machine registers */
117 /* Note: I make a fake copy of the pc in register 25 (calling it ps) so
118 that I can clear the status bits from pc (register 15) */
122 /* An array of names of registers. */
124 extern char **arm_register_names
;
125 #define REGISTER_NAME(i) arm_register_names[i]
127 /* Register numbers of various important registers.
128 Note that some of these values are "real" register numbers,
129 and correspond to the general registers of the machine,
130 and some are "phony" register numbers which are too large
131 to be actual register numbers as far as the user is concerned
132 but do serve to get the desired values when passed to read_register. */
134 #define A1_REGNUM 0 /* first integer-like argument */
135 #define A4_REGNUM 3 /* last integer-like argument */
137 #define FP_REGNUM 11 /* Contains address of executing stack frame */
138 #define SP_REGNUM 13 /* Contains address of top of stack */
139 #define LR_REGNUM 14 /* address to return to from a function call */
140 #define PC_REGNUM 15 /* Contains program counter */
141 #define F0_REGNUM 16 /* first floating point register */
142 #define F3_REGNUM 19 /* last floating point argument register */
143 #define F7_REGNUM 23 /* last floating point register */
144 #define FPS_REGNUM 24 /* floating point status register */
145 #define PS_REGNUM 25 /* Contains processor status */
147 #define THUMB_FP_REGNUM 7 /* R7 is frame register on Thumb */
149 #define ARM_NUM_ARG_REGS 4
150 #define ARM_LAST_ARG_REGNUM A4_REGNUM
151 #define ARM_NUM_FP_ARG_REGS 4
152 #define ARM_LAST_FP_ARG_REGNUM F3_REGNUM
154 /* Instruction condition field values. */
172 #define FLAG_N 0x80000000
173 #define FLAG_Z 0x40000000
174 #define FLAG_C 0x20000000
175 #define FLAG_V 0x10000000
179 /* Total amount of space needed to store our copies of the machine's
180 register state, the array `registers'. */
181 #define REGISTER_BYTES (16*4 + 12*8 + 4 + 4)
183 /* Index within `registers' of the first byte of the space for
186 #define REGISTER_BYTE(N) (((N) < F0_REGNUM) ? (N)*4 : \
187 (((N) < PS_REGNUM) ? 16*4 + ((N) - 16)*12 : \
188 16*4 + 8*12 + ((N) - FPS_REGNUM) * 4))
190 /* Number of bytes of storage in the actual machine representation
191 for register N. On the vax, all regs are 4 bytes. */
193 #define REGISTER_RAW_SIZE(N) (((N) < F0_REGNUM || (N) >= FPS_REGNUM) ? 4 : 12)
195 /* Number of bytes of storage in the program's representation
196 for register N. On the vax, all regs are 4 bytes. */
198 #define REGISTER_VIRTUAL_SIZE(N) (((N) < F0_REGNUM || (N) >= FPS_REGNUM) ? 4 : 8)
200 /* Largest value REGISTER_RAW_SIZE can have. */
202 #define MAX_REGISTER_RAW_SIZE 12
204 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
206 #define MAX_REGISTER_VIRTUAL_SIZE 8
208 /* Nonzero if register N requires conversion
209 from raw format to virtual format. */
210 #define REGISTER_CONVERTIBLE(N) ((unsigned)(N) - F0_REGNUM < 8)
212 /* Convert data from raw format for register REGNUM in buffer FROM
213 to virtual format with type TYPE in buffer TO. */
215 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
218 convert_from_extended ((FROM), & val); \
219 store_floating ((TO), TYPE_LENGTH (TYPE), val); \
222 /* Convert data from virtual format with type TYPE in buffer FROM
223 to raw format for register REGNUM in buffer TO. */
225 #define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \
227 double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
228 convert_to_extended (&val, (TO)); \
230 /* Return the GDB type object for the "standard" data type
231 of data in register N. */
233 #define REGISTER_VIRTUAL_TYPE(N) \
234 (((unsigned)(N) - F0_REGNUM) < 8 ? builtin_type_double : builtin_type_int)
236 /* The system C compiler uses a similar structure return convention to gcc */
237 extern use_struct_convention_fn arm_use_struct_convention
;
238 #define USE_STRUCT_CONVENTION(gcc_p, type) arm_use_struct_convention (gcc_p, type)
240 /* Store the address of the place in which to copy the structure the
241 subroutine will return. This is called from call_function. */
243 #define STORE_STRUCT_RETURN(ADDR, SP) \
244 { write_register (0, (ADDR)); }
246 /* Extract from an array REGBUF containing the (raw) register state
247 a function return value of type TYPE, and copy that, in virtual format,
250 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
251 if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
252 convert_from_extended (REGBUF + REGISTER_BYTE (F0_REGNUM), VALBUF); \
254 memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
256 /* Write into appropriate registers a function return value
257 of type TYPE, given in virtual format. */
259 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
260 if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) { \
261 char _buf[MAX_REGISTER_RAW_SIZE]; \
262 convert_to_extended (VALBUF, _buf); \
263 write_register_bytes (REGISTER_BYTE (F0_REGNUM), _buf, MAX_REGISTER_RAW_SIZE); \
265 write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
267 /* Extract from an array REGBUF containing the (raw) register state
268 the address in which a function should return its structure value,
269 as a CORE_ADDR (or an expression that can be used as one). */
271 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
272 (extract_address ((PTR) (REGBUF), REGISTER_RAW_SIZE(0)))
274 /* Specify that for the native compiler variables for a particular
275 lexical context are listed after the beginning LBRAC instead of
276 before in the executables list of symbols. */
277 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) (!(gcc_p))
280 /* Define other aspects of the stack frame.
281 We keep the offsets of all saved registers, 'cause we need 'em a lot!
282 We also keep the current size of the stack frame, and the offset of
283 the frame pointer from the stack pointer (for frameless functions, and
284 when we're still in the prologue of a function with a frame) */
286 #define EXTRA_FRAME_INFO \
287 struct frame_saved_regs fsr; \
292 extern void arm_init_extra_frame_info
PARAMS ((struct frame_info
*fi
));
293 #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) arm_init_extra_frame_info (fi)
295 /* Return the frame address. On ARM, it is R11; on Thumb it is R7. */
296 CORE_ADDR arm_target_read_fp
PARAMS ((void));
297 #define TARGET_READ_FP() arm_target_read_fp ()
299 /* Describe the pointer in each stack frame to the previous stack frame
302 /* FRAME_CHAIN takes a frame's nominal address
303 and produces the frame's chain-pointer.
305 However, if FRAME_CHAIN_VALID returns zero,
306 it means the given frame is the outermost one and has no caller. */
308 #define FRAME_CHAIN(thisframe) (CORE_ADDR) arm_frame_chain (thisframe)
309 extern CORE_ADDR arm_frame_chain
PARAMS ((struct frame_info
*));
311 extern int arm_frame_chain_valid
PARAMS ((CORE_ADDR
, struct frame_info
*));
312 #define FRAME_CHAIN_VALID(chain, thisframe) arm_frame_chain_valid (chain, thisframe)
314 /* Define other aspects of the stack frame. */
316 /* A macro that tells us whether the function invocation represented
317 by FI does not have a frame on the stack associated with it. If it
318 does not, FRAMELESS is set to 1, else 0. */
319 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
321 CORE_ADDR func_start, after_prologue; \
322 func_start = (get_pc_function_start ((FI)->pc) + \
323 FUNCTION_START_OFFSET); \
324 after_prologue = func_start; \
325 SKIP_PROLOGUE (after_prologue); \
326 (FRAMELESS) = (after_prologue == func_start); \
331 #define FRAME_SAVED_PC(FRAME) arm_frame_saved_pc (FRAME)
332 extern CORE_ADDR arm_frame_saved_pc
PARAMS ((struct frame_info
*));
334 #define FRAME_ARGS_ADDRESS(fi) (fi->frame)
336 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
338 /* Return number of args passed to a frame.
339 Can return -1, meaning no way to tell. */
341 #define FRAME_NUM_ARGS(numargs, fi) (numargs = -1)
343 /* Return number of bytes at start of arglist that are not really args. */
345 #define FRAME_ARGS_SKIP 0
347 /* Put here the code to store, into a struct frame_saved_regs,
348 the addresses of the saved registers of frame described by FRAME_INFO.
349 This includes special registers such as pc and fp saved in special
350 ways in the stack frame. sp is even more special:
351 the address we return for it IS the sp for the next frame. */
353 struct frame_saved_regs
;
355 void frame_find_saved_regs
PARAMS((struct frame_info
*fi
,
356 struct frame_saved_regs
*fsr
));
358 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
359 arm_frame_find_saved_regs (frame_info, &(frame_saved_regs));
362 /* Things needed for making the inferior call functions. */
364 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
365 sp = arm_push_arguments ((nargs), (args), (sp), (struct_return), (struct_addr))
367 arm_push_arguments
PARAMS ((int, struct value
**, CORE_ADDR
, int, CORE_ADDR
));
369 /* Push an empty stack frame, to record the current PC, etc. */
371 void arm_push_dummy_frame
PARAMS ((void));
373 #define PUSH_DUMMY_FRAME arm_push_dummy_frame ()
375 /* Discard from the stack the innermost frame, restoring all registers. */
377 void arm_pop_frame
PARAMS ((void));
379 #define POP_FRAME arm_pop_frame ()
381 /* This sequence of words is the instructions
387 Note this is 12 bytes. */
389 #define CALL_DUMMY {0xe1a0e00f, 0xe1a0f004, 0xE7FFDEFE}
391 #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
393 #define CALL_DUMMY_BREAKPOINT_OFFSET arm_call_dummy_breakpoint_offset()
394 extern int arm_call_dummy_breakpoint_offset
PARAMS ((void));
396 /* Insert the specified number of args and function address
397 into a call sequence of the above form stored at DUMMYNAME. */
399 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
400 arm_fix_call_dummy (dummyname, pc, fun, nargs, args, type, gcc_p)
402 void arm_fix_call_dummy
PARAMS ((char *dummy
, CORE_ADDR pc
, CORE_ADDR fun
,
403 int nargs
, struct value
**args
,
404 struct type
*type
, int gcc_p
));
406 CORE_ADDR arm_get_next_pc
PARAMS ((CORE_ADDR
));
408 /* Functions for dealing with Thumb call thunks. */
409 #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) arm_in_call_stub (pc, name)
410 #define SKIP_TRAMPOLINE_CODE(pc) arm_skip_stub (pc)
411 extern int arm_in_call_stub
PARAMS ((CORE_ADDR pc
, char *name
));
412 extern CORE_ADDR arm_skip_stub
PARAMS ((CORE_ADDR pc
));
414 /* Function to determine whether MEMADDR is in a Thumb function. */
415 extern int arm_pc_is_thumb
PARAMS ((bfd_vma memaddr
));
417 /* Function to determine whether MEMADDR is in a call dummy called from
419 extern int arm_pc_is_thumb_dummy
PARAMS ((bfd_vma memaddr
));
421 /* Macros for setting and testing a bit in a minimal symbol that
422 marks it as Thumb function. The MSB of the minimal symbol's
423 "info" field is used for this purpose. This field is already
424 being used to store the symbol size, so the assumption is
425 that the symbol size cannot exceed 2^31.
427 COFF_MAKE_MSYMBOL_SPECIAL
428 ELF_MAKE_MSYMBOL_SPECIAL tests whether the COFF or ELF symbol corresponds
429 to a thumb function, and sets a "special" bit in a
430 minimal symbol to indicate that it does
431 MSYMBOL_SET_SPECIAL actually sets the "special" bit
432 MSYMBOL_IS_SPECIAL tests the "special" bit in a minimal symbol
433 MSYMBOL_SIZE returns the size of the minimal symbol, i.e.
434 the "info" field with the "special" bit masked out
437 extern int coff_sym_is_thumb(int val
);
438 #define MSYMBOL_SET_SPECIAL(msym) \
439 MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) | 0x80000000)
440 #define MSYMBOL_IS_SPECIAL(msym) \
441 (((long) MSYMBOL_INFO (msym) & 0x80000000) != 0)
442 #define MSYMBOL_SIZE(msym) \
443 ((long) MSYMBOL_INFO (msym) & 0x7fffffff)
445 /* Thumb symbol are of type STT_LOPROC, (synonymous with STT_ARM_TFUNC) */
446 #define ELF_MAKE_MSYMBOL_SPECIAL(sym,msym) \
447 { if(ELF_ST_TYPE(((elf_symbol_type *)(sym))->internal_elf_sym.st_info) == STT_LOPROC) \
448 MSYMBOL_SET_SPECIAL(msym); }
450 #define COFF_MAKE_MSYMBOL_SPECIAL(val,msym) \
451 { if(coff_sym_is_thumb(val)) MSYMBOL_SET_SPECIAL(msym); }
454 #define IN_SIGTRAMP(pc, name) 0