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c906108c | 1 | /* Definitions to make GDB target for an ARM |
7a292a7a | 2 | Copyright 1986-1989, 1991, 1993-1999 Free Software Foundation, Inc. |
c906108c | 3 | |
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c | 20 | |
c5aa993b | 21 | #ifdef __STDC__ /* Forward decls for prototypes */ |
c906108c SS |
22 | struct type; |
23 | struct value; | |
24 | #endif | |
25 | ||
26 | #define TARGET_BYTE_ORDER_SELECTABLE | |
27 | ||
28 | /* IEEE format floating point */ | |
29 | ||
30 | #define IEEE_FLOAT | |
31 | ||
32 | /* FIXME: may need a floatformat_ieee_double_bigbyte_littleword format for | |
33 | BIG_ENDIAN use. -fnf */ | |
34 | ||
35 | #define TARGET_DOUBLE_FORMAT (target_byte_order == BIG_ENDIAN \ | |
36 | ? &floatformat_ieee_double_big \ | |
37 | : &floatformat_ieee_double_littlebyte_bigword) | |
38 | ||
39 | /* When reading symbols, we need to zap the low bit of the address, which | |
40 | may be set to 1 for Thumb functions. */ | |
41 | ||
42 | #define SMASH_TEXT_ADDRESS(addr) ((addr) &= ~0x1) | |
43 | ||
44 | /* Remove useless bits from addresses in a running program. */ | |
45 | ||
46 | CORE_ADDR arm_addr_bits_remove PARAMS ((CORE_ADDR)); | |
47 | ||
48 | #define ADDR_BITS_REMOVE(val) (arm_addr_bits_remove (val)) | |
49 | ||
50 | /* Offset from address of function to start of its code. | |
51 | Zero on most machines. */ | |
52 | ||
53 | #define FUNCTION_START_OFFSET 0 | |
54 | ||
55 | /* Advance PC across any function entry prologue instructions | |
56 | to reach some "real" code. */ | |
57 | ||
58 | extern CORE_ADDR arm_skip_prologue PARAMS ((CORE_ADDR pc)); | |
59 | ||
b83266a0 | 60 | #define SKIP_PROLOGUE(pc) (arm_skip_prologue (pc)) |
c906108c SS |
61 | |
62 | /* Immediately after a function call, return the saved pc. | |
63 | Can't always go through the frames for this because on some machines | |
64 | the new frame is not set up until the new function executes | |
65 | some instructions. */ | |
66 | ||
67 | #define SAVED_PC_AFTER_CALL(frame) arm_saved_pc_after_call (frame) | |
68 | struct frame_info; | |
69 | extern CORE_ADDR arm_saved_pc_after_call PARAMS ((struct frame_info *)); | |
70 | ||
71 | /* I don't know the real values for these. */ | |
72 | #define TARGET_UPAGES UPAGES | |
73 | #define TARGET_NBPG NBPG | |
74 | ||
75 | /* Address of end of stack space. */ | |
76 | ||
77 | #define STACK_END_ADDR (0x01000000 - (TARGET_UPAGES * TARGET_NBPG)) | |
78 | ||
79 | /* Stack grows downward. */ | |
80 | ||
81 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
82 | ||
83 | /* !!!! if we're using RDP, then we're inserting breakpoints and storing | |
84 | their handles instread of what was in memory. It is nice that | |
85 | this is the same size as a handle - otherwise remote-rdp will | |
86 | have to change. */ | |
87 | ||
88 | /* BREAKPOINT_FROM_PC uses the program counter value to determine whether a | |
89 | 16- or 32-bit breakpoint should be used. It returns a pointer | |
90 | to a string of bytes that encode a breakpoint instruction, stores | |
91 | the length of the string to *lenptr, and adjusts the pc (if necessary) to | |
92 | point to the actual memory location where the breakpoint should be | |
93 | inserted. */ | |
94 | ||
95 | extern breakpoint_from_pc_fn arm_breakpoint_from_pc; | |
96 | #define BREAKPOINT_FROM_PC(pcptr, lenptr) arm_breakpoint_from_pc (pcptr, lenptr) | |
97 | ||
98 | /* Amount PC must be decremented by after a breakpoint. | |
99 | This is often the number of bytes in BREAKPOINT | |
100 | but not always. */ | |
101 | ||
102 | #define DECR_PC_AFTER_BREAK 0 | |
103 | ||
104 | /* code to execute to print interesting information about the | |
105 | * floating point processor (if any) | |
106 | * No need to define if there is nothing to do. | |
107 | */ | |
108 | #define FLOAT_INFO { arm_float_info (); } | |
109 | ||
110 | /* Say how long (ordinary) registers are. This is a piece of bogosity | |
111 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
112 | real way to know how big a register is. */ | |
113 | ||
114 | #define REGISTER_SIZE 4 | |
115 | ||
116 | /* Number of machine registers */ | |
117 | ||
118 | /* Note: I make a fake copy of the pc in register 25 (calling it ps) so | |
119 | that I can clear the status bits from pc (register 15) */ | |
120 | ||
121 | #define NUM_REGS 26 | |
122 | ||
123 | /* An array of names of registers. */ | |
124 | ||
125 | extern char **arm_register_names; | |
126 | #define REGISTER_NAME(i) arm_register_names[i] | |
127 | ||
128 | /* Register numbers of various important registers. | |
129 | Note that some of these values are "real" register numbers, | |
130 | and correspond to the general registers of the machine, | |
131 | and some are "phony" register numbers which are too large | |
132 | to be actual register numbers as far as the user is concerned | |
133 | but do serve to get the desired values when passed to read_register. */ | |
134 | ||
135 | #define A1_REGNUM 0 /* first integer-like argument */ | |
136 | #define A4_REGNUM 3 /* last integer-like argument */ | |
137 | #define AP_REGNUM 11 | |
138 | #define FP_REGNUM 11 /* Contains address of executing stack frame */ | |
139 | #define SP_REGNUM 13 /* Contains address of top of stack */ | |
140 | #define LR_REGNUM 14 /* address to return to from a function call */ | |
141 | #define PC_REGNUM 15 /* Contains program counter */ | |
142 | #define F0_REGNUM 16 /* first floating point register */ | |
143 | #define F3_REGNUM 19 /* last floating point argument register */ | |
144 | #define F7_REGNUM 23 /* last floating point register */ | |
145 | #define FPS_REGNUM 24 /* floating point status register */ | |
146 | #define PS_REGNUM 25 /* Contains processor status */ | |
147 | ||
148 | #define THUMB_FP_REGNUM 7 /* R7 is frame register on Thumb */ | |
149 | ||
150 | #define ARM_NUM_ARG_REGS 4 | |
151 | #define ARM_LAST_ARG_REGNUM A4_REGNUM | |
152 | #define ARM_NUM_FP_ARG_REGS 4 | |
153 | #define ARM_LAST_FP_ARG_REGNUM F3_REGNUM | |
154 | ||
155 | /* Instruction condition field values. */ | |
156 | #define INST_EQ 0x0 | |
157 | #define INST_NE 0x1 | |
158 | #define INST_CS 0x2 | |
159 | #define INST_CC 0x3 | |
160 | #define INST_MI 0x4 | |
161 | #define INST_PL 0x5 | |
162 | #define INST_VS 0x6 | |
163 | #define INST_VC 0x7 | |
164 | #define INST_HI 0x8 | |
165 | #define INST_LS 0x9 | |
166 | #define INST_GE 0xa | |
167 | #define INST_LT 0xb | |
168 | #define INST_GT 0xc | |
169 | #define INST_LE 0xd | |
170 | #define INST_AL 0xe | |
171 | #define INST_NV 0xf | |
172 | ||
173 | #define FLAG_N 0x80000000 | |
174 | #define FLAG_Z 0x40000000 | |
175 | #define FLAG_C 0x20000000 | |
176 | #define FLAG_V 0x10000000 | |
177 | ||
178 | ||
179 | ||
180 | /* Total amount of space needed to store our copies of the machine's | |
181 | register state, the array `registers'. */ | |
182 | #define REGISTER_BYTES (16*4 + 12*8 + 4 + 4) | |
183 | ||
184 | /* Index within `registers' of the first byte of the space for | |
185 | register N. */ | |
186 | ||
187 | #define REGISTER_BYTE(N) (((N) < F0_REGNUM) ? (N)*4 : \ | |
188 | (((N) < PS_REGNUM) ? 16*4 + ((N) - 16)*12 : \ | |
189 | 16*4 + 8*12 + ((N) - FPS_REGNUM) * 4)) | |
190 | ||
191 | /* Number of bytes of storage in the actual machine representation | |
192 | for register N. On the vax, all regs are 4 bytes. */ | |
193 | ||
194 | #define REGISTER_RAW_SIZE(N) (((N) < F0_REGNUM || (N) >= FPS_REGNUM) ? 4 : 12) | |
195 | ||
196 | /* Number of bytes of storage in the program's representation | |
197 | for register N. On the vax, all regs are 4 bytes. */ | |
198 | ||
199 | #define REGISTER_VIRTUAL_SIZE(N) (((N) < F0_REGNUM || (N) >= FPS_REGNUM) ? 4 : 8) | |
200 | ||
201 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
202 | ||
c5aa993b | 203 | #define MAX_REGISTER_RAW_SIZE 12 |
c906108c SS |
204 | |
205 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
206 | ||
207 | #define MAX_REGISTER_VIRTUAL_SIZE 8 | |
208 | ||
209 | /* Nonzero if register N requires conversion | |
210 | from raw format to virtual format. */ | |
211 | #define REGISTER_CONVERTIBLE(N) ((unsigned)(N) - F0_REGNUM < 8) | |
212 | ||
213 | /* Convert data from raw format for register REGNUM in buffer FROM | |
214 | to virtual format with type TYPE in buffer TO. */ | |
215 | ||
216 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \ | |
217 | { \ | |
218 | double val; \ | |
219 | convert_from_extended ((FROM), & val); \ | |
220 | store_floating ((TO), TYPE_LENGTH (TYPE), val); \ | |
221 | } | |
222 | ||
223 | /* Convert data from virtual format with type TYPE in buffer FROM | |
224 | to raw format for register REGNUM in buffer TO. */ | |
225 | ||
226 | #define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \ | |
227 | { \ | |
228 | double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \ | |
229 | convert_to_extended (&val, (TO)); \ | |
230 | } | |
231 | /* Return the GDB type object for the "standard" data type | |
232 | of data in register N. */ | |
233 | ||
234 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
235 | (((unsigned)(N) - F0_REGNUM) < 8 ? builtin_type_double : builtin_type_int) | |
236 | \f | |
237 | /* The system C compiler uses a similar structure return convention to gcc */ | |
238 | extern use_struct_convention_fn arm_use_struct_convention; | |
239 | #define USE_STRUCT_CONVENTION(gcc_p, type) arm_use_struct_convention (gcc_p, type) | |
240 | ||
241 | /* Store the address of the place in which to copy the structure the | |
242 | subroutine will return. This is called from call_function. */ | |
243 | ||
244 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
245 | { write_register (0, (ADDR)); } | |
246 | ||
247 | /* Extract from an array REGBUF containing the (raw) register state | |
248 | a function return value of type TYPE, and copy that, in virtual format, | |
249 | into VALBUF. */ | |
250 | ||
251 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
252 | if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \ | |
253 | convert_from_extended (REGBUF + REGISTER_BYTE (F0_REGNUM), VALBUF); \ | |
254 | else \ | |
255 | memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE)) | |
256 | ||
257 | /* Write into appropriate registers a function return value | |
258 | of type TYPE, given in virtual format. */ | |
259 | ||
260 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
261 | if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) { \ | |
262 | char _buf[MAX_REGISTER_RAW_SIZE]; \ | |
263 | convert_to_extended (VALBUF, _buf); \ | |
264 | write_register_bytes (REGISTER_BYTE (F0_REGNUM), _buf, MAX_REGISTER_RAW_SIZE); \ | |
265 | } else \ | |
266 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) | |
267 | ||
268 | /* Extract from an array REGBUF containing the (raw) register state | |
269 | the address in which a function should return its structure value, | |
270 | as a CORE_ADDR (or an expression that can be used as one). */ | |
271 | ||
7a292a7a SS |
272 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \ |
273 | (extract_address ((PTR) (REGBUF), REGISTER_RAW_SIZE(0))) | |
c906108c SS |
274 | |
275 | /* Specify that for the native compiler variables for a particular | |
276 | lexical context are listed after the beginning LBRAC instead of | |
277 | before in the executables list of symbols. */ | |
278 | #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) (!(gcc_p)) | |
c906108c | 279 | \f |
c5aa993b | 280 | |
c906108c SS |
281 | /* Define other aspects of the stack frame. |
282 | We keep the offsets of all saved registers, 'cause we need 'em a lot! | |
283 | We also keep the current size of the stack frame, and the offset of | |
284 | the frame pointer from the stack pointer (for frameless functions, and | |
285 | when we're still in the prologue of a function with a frame) */ | |
286 | ||
287 | #define EXTRA_FRAME_INFO \ | |
288 | struct frame_saved_regs fsr; \ | |
289 | int framesize; \ | |
290 | int frameoffset; \ | |
291 | int framereg; | |
292 | ||
c5aa993b | 293 | extern void arm_init_extra_frame_info PARAMS ((struct frame_info * fi)); |
c906108c SS |
294 | #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) arm_init_extra_frame_info (fi) |
295 | ||
296 | /* Return the frame address. On ARM, it is R11; on Thumb it is R7. */ | |
297 | CORE_ADDR arm_target_read_fp PARAMS ((void)); | |
298 | #define TARGET_READ_FP() arm_target_read_fp () | |
299 | ||
300 | /* Describe the pointer in each stack frame to the previous stack frame | |
301 | (its caller). */ | |
302 | ||
303 | /* FRAME_CHAIN takes a frame's nominal address | |
304 | and produces the frame's chain-pointer. | |
305 | ||
306 | However, if FRAME_CHAIN_VALID returns zero, | |
307 | it means the given frame is the outermost one and has no caller. */ | |
308 | ||
309 | #define FRAME_CHAIN(thisframe) (CORE_ADDR) arm_frame_chain (thisframe) | |
310 | extern CORE_ADDR arm_frame_chain PARAMS ((struct frame_info *)); | |
311 | ||
312 | extern int arm_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *)); | |
313 | #define FRAME_CHAIN_VALID(chain, thisframe) arm_frame_chain_valid (chain, thisframe) | |
314 | ||
315 | /* Define other aspects of the stack frame. */ | |
316 | ||
392a587b JM |
317 | /* An expression that tells us whether the function invocation represented |
318 | by FI does not have a frame on the stack associated with it. */ | |
c5aa993b | 319 | extern int arm_frameless_function_invocation PARAMS ((struct frame_info * frame)); |
392a587b | 320 | #define FRAMELESS_FUNCTION_INVOCATION(FI) (arm_frameless_function_invocation (FI)) |
c906108c SS |
321 | |
322 | /* Saved Pc. */ | |
323 | ||
324 | #define FRAME_SAVED_PC(FRAME) arm_frame_saved_pc (FRAME) | |
325 | extern CORE_ADDR arm_frame_saved_pc PARAMS ((struct frame_info *)); | |
326 | ||
327 | #define FRAME_ARGS_ADDRESS(fi) (fi->frame) | |
328 | ||
329 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
330 | ||
331 | /* Return number of args passed to a frame. | |
332 | Can return -1, meaning no way to tell. */ | |
333 | ||
392a587b | 334 | #define FRAME_NUM_ARGS(fi) (-1) |
c906108c SS |
335 | |
336 | /* Return number of bytes at start of arglist that are not really args. */ | |
337 | ||
338 | #define FRAME_ARGS_SKIP 0 | |
339 | ||
340 | /* Put here the code to store, into a struct frame_saved_regs, | |
341 | the addresses of the saved registers of frame described by FRAME_INFO. | |
342 | This includes special registers such as pc and fp saved in special | |
343 | ways in the stack frame. sp is even more special: | |
344 | the address we return for it IS the sp for the next frame. */ | |
345 | ||
346 | struct frame_saved_regs; | |
347 | struct frame_info; | |
c5aa993b JM |
348 | void frame_find_saved_regs PARAMS ((struct frame_info * fi, |
349 | struct frame_saved_regs * fsr)); | |
c906108c SS |
350 | |
351 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
352 | arm_frame_find_saved_regs (frame_info, &(frame_saved_regs)); | |
c906108c | 353 | \f |
c5aa993b | 354 | |
c906108c SS |
355 | /* Things needed for making the inferior call functions. */ |
356 | ||
357 | #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \ | |
392a587b JM |
358 | (arm_push_arguments ((nargs), (args), (sp), (struct_return), (struct_addr))) |
359 | extern CORE_ADDR arm_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int, CORE_ADDR)); | |
c906108c SS |
360 | |
361 | /* Push an empty stack frame, to record the current PC, etc. */ | |
362 | ||
363 | void arm_push_dummy_frame PARAMS ((void)); | |
364 | ||
365 | #define PUSH_DUMMY_FRAME arm_push_dummy_frame () | |
366 | ||
367 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
368 | ||
369 | void arm_pop_frame PARAMS ((void)); | |
370 | ||
371 | #define POP_FRAME arm_pop_frame () | |
372 | ||
373 | /* This sequence of words is the instructions | |
374 | ||
c5aa993b JM |
375 | mov lr,pc |
376 | mov pc,r4 | |
377 | illegal | |
c906108c SS |
378 | |
379 | Note this is 12 bytes. */ | |
380 | ||
381 | #define CALL_DUMMY {0xe1a0e00f, 0xe1a0f004, 0xE7FFDEFE} | |
382 | ||
c5aa993b | 383 | #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */ |
c906108c SS |
384 | |
385 | #define CALL_DUMMY_BREAKPOINT_OFFSET arm_call_dummy_breakpoint_offset() | |
386 | extern int arm_call_dummy_breakpoint_offset PARAMS ((void)); | |
387 | ||
388 | /* Insert the specified number of args and function address | |
389 | into a call sequence of the above form stored at DUMMYNAME. */ | |
390 | ||
391 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
392 | arm_fix_call_dummy (dummyname, pc, fun, nargs, args, type, gcc_p) | |
393 | ||
394 | void arm_fix_call_dummy PARAMS ((char *dummy, CORE_ADDR pc, CORE_ADDR fun, | |
c5aa993b JM |
395 | int nargs, struct value ** args, |
396 | struct type * type, int gcc_p)); | |
c906108c SS |
397 | |
398 | CORE_ADDR arm_get_next_pc PARAMS ((CORE_ADDR)); | |
399 | ||
400 | /* Functions for dealing with Thumb call thunks. */ | |
401 | #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) arm_in_call_stub (pc, name) | |
402 | #define SKIP_TRAMPOLINE_CODE(pc) arm_skip_stub (pc) | |
c5aa993b | 403 | extern int arm_in_call_stub PARAMS ((CORE_ADDR pc, char *name)); |
c906108c SS |
404 | extern CORE_ADDR arm_skip_stub PARAMS ((CORE_ADDR pc)); |
405 | ||
406 | /* Function to determine whether MEMADDR is in a Thumb function. */ | |
407 | extern int arm_pc_is_thumb PARAMS ((bfd_vma memaddr)); | |
408 | ||
409 | /* Function to determine whether MEMADDR is in a call dummy called from | |
410 | a Thumb function. */ | |
411 | extern int arm_pc_is_thumb_dummy PARAMS ((bfd_vma memaddr)); | |
412 | ||
413 | /* Macros for setting and testing a bit in a minimal symbol that | |
414 | marks it as Thumb function. The MSB of the minimal symbol's | |
415 | "info" field is used for this purpose. This field is already | |
416 | being used to store the symbol size, so the assumption is | |
417 | that the symbol size cannot exceed 2^31. | |
c5aa993b | 418 | |
c906108c | 419 | COFF_MAKE_MSYMBOL_SPECIAL |
c5aa993b JM |
420 | ELF_MAKE_MSYMBOL_SPECIAL tests whether the COFF or ELF symbol corresponds |
421 | to a thumb function, and sets a "special" bit in a | |
422 | minimal symbol to indicate that it does | |
423 | MSYMBOL_SET_SPECIAL actually sets the "special" bit | |
c906108c SS |
424 | MSYMBOL_IS_SPECIAL tests the "special" bit in a minimal symbol |
425 | MSYMBOL_SIZE returns the size of the minimal symbol, i.e. | |
c5aa993b JM |
426 | the "info" field with the "special" bit masked out |
427 | */ | |
428 | ||
429 | extern int coff_sym_is_thumb (int val); | |
c906108c SS |
430 | #define MSYMBOL_SET_SPECIAL(msym) \ |
431 | MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) | 0x80000000) | |
432 | #define MSYMBOL_IS_SPECIAL(msym) \ | |
433 | (((long) MSYMBOL_INFO (msym) & 0x80000000) != 0) | |
434 | #define MSYMBOL_SIZE(msym) \ | |
435 | ((long) MSYMBOL_INFO (msym) & 0x7fffffff) | |
436 | ||
437 | /* Thumb symbol are of type STT_LOPROC, (synonymous with STT_ARM_TFUNC) */ | |
438 | #define ELF_MAKE_MSYMBOL_SPECIAL(sym,msym) \ | |
439 | { if(ELF_ST_TYPE(((elf_symbol_type *)(sym))->internal_elf_sym.st_info) == STT_LOPROC) \ | |
440 | MSYMBOL_SET_SPECIAL(msym); } | |
c5aa993b | 441 | |
c906108c SS |
442 | #define COFF_MAKE_MSYMBOL_SPECIAL(val,msym) \ |
443 | { if(coff_sym_is_thumb(val)) MSYMBOL_SET_SPECIAL(msym); } | |
444 | ||
445 | #undef IN_SIGTRAMP | |
446 | #define IN_SIGTRAMP(pc, name) 0 |