1 /* Target machine definitions for GDB on a Sequent Symmetry under dynix 3.0,
2 with Weitek 1167 and i387 support.
3 Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
4 Symmetry version by Jay Vosburgh (uunet!sequent!fubar).
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
22 /* I don't know if this will work for cross-debugging, even if you do get
23 a copy of the right include file. */
24 #include <machine/reg.h>
26 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
28 /* Offset from address of function to start of its code.
29 Zero on most machines. */
31 #define FUNCTION_START_OFFSET 0
33 /* Advance PC across any function entry prologue instructions
34 to reach some "real" code. From m-i386.h */
36 #define SKIP_PROLOGUE(frompc) {(frompc) = i386_skip_prologue((frompc));}
39 i386_skip_prologue
PARAMS ((int));
41 /* Immediately after a function call, return the saved pc.
42 Can't always go through the frames for this because on some machines
43 the new frame is not set up until the new function executes
46 #define SAVED_PC_AFTER_CALL(frame) \
47 read_memory_integer(read_register(SP_REGNUM), 4)
49 /* I don't know the real values for these. */
50 #define TARGET_UPAGES UPAGES
51 #define TARGET_NBPG NBPG
53 /* Address of end of stack space. */
55 #define STACK_END_ADDR (0x40000000 - (TARGET_UPAGES * TARGET_NBPG))
57 /* Stack grows downward. */
61 /* Sequence of bytes for breakpoint instruction. */
63 #define BREAKPOINT {0xcc}
65 /* Amount PC must be decremented by after a breakpoint.
66 This is often the number of bytes in BREAKPOINT
69 #define DECR_PC_AFTER_BREAK 0
71 /* Nonzero if instruction at PC is a return instruction. */
72 /* For Symmetry, this is really the 'leave' instruction, which */
73 /* is right before the ret */
75 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc9)
77 /* Return 1 if P points to an invalid floating point value.
80 #define INVALID_FLOAT(p, len) (0)
83 --- this code can
't be used unless we know we are running native,
84 since it uses host specific ptrace calls.
85 /* code for 80387 fpu. Functions are from i386-dep.c, copied into
88 #define FLOAT_INFO { i386_float_info(); }
91 /* Say how long (ordinary) registers are. */
93 #define REGISTER_TYPE long
95 /* Number of machine registers */
98 /* Initializer for an array of names of registers.
99 There should be NUM_REGS strings in this initializer. */
101 /* Symmetry registers are in this weird order to match the register
102 numbers in the symbol table entries. If you change the order,
103 things will probably break mysteriously for no apparent reason.
104 Also note that the st(0)...st(7) 387 registers are represented as
107 #define REGISTER_NAMES { "eax", "edx", "ecx", "st0", "st1", \
108 "ebx", "esi", "edi", "st2", "st3", \
109 "st4", "st5", "st6", "st7", "esp", \
110 "ebp", "eip", "eflags", "fp1", "fp2", \
111 "fp3", "fp4", "fp5", "fp6", "fp7", \
112 "fp8", "fp9", "fp10", "fp11", "fp12", \
113 "fp13", "fp14", "fp15", "fp16", "fp17", \
114 "fp18", "fp19", "fp20", "fp21", "fp22", \
115 "fp23", "fp24", "fp25", "fp26", "fp27", \
116 "fp28", "fp29", "fp30", "fp31" }
118 /* Register numbers of various important registers.
119 Note that some of these values are "real" register numbers,
120 and correspond to the general registers of the machine,
121 and some are "phony" register numbers which are too large
122 to be actual register numbers as far as the user is concerned
123 but do serve to get the desired values when passed to read_register. */
125 #define FP1_REGNUM 18 /* first 1167 register */
126 #define SP_REGNUM 14 /* Contains address of top of stack */
127 #define FP_REGNUM 15 /* Contains address of executing stack frame */
128 #define PC_REGNUM 16 /* Contains program counter */
129 #define PS_REGNUM 17 /* Contains processor status */
131 /* Total amount of space needed to store our copies of the machine's
132 register state
, the array `registers
'. */
133 /* 10 i386 registers, 8 i387 registers, and 31 Weitek 1167 registers */
134 #define REGISTER_BYTES ((10 * 4) + (8 * 10) + (31 * 4))
136 /* Index within `registers' of the first byte of the space
for
139 #define REGISTER_BYTE(N) \
140 ((N < 3) ? (N * 4) : \
141 (N < 5) ? (((N - 2) * 10) + 2) : \
142 (N < 8) ? (((N - 5) * 4) + 32) : \
143 (N < 14) ? (((N - 8) * 10) + 44) : \
144 (((N - 14) * 4) + 104))
146 /* Number of bytes of storage in the actual machine representation
147 * for register N. All registers are 4 bytes, except 387 st(0) - st(7),
148 * which are 80 bits each.
151 #define REGISTER_RAW_SIZE(N) \
158 /* Number of bytes of storage in the program's representation
159 for register N. On the vax, all regs are 4 bytes. */
161 #define REGISTER_VIRTUAL_SIZE(N) 4
163 /* Largest value REGISTER_RAW_SIZE can have. */
165 #define MAX_REGISTER_RAW_SIZE 10
167 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
169 #define MAX_REGISTER_VIRTUAL_SIZE 4
171 /* Nonzero if register N requires conversion
172 from raw format to virtual format. */
174 #define REGISTER_CONVERTIBLE(N) \
181 /* Convert data from raw format for register REGNUM
182 to virtual format for register REGNUM. */
184 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
185 ((REGNUM < 3) ? bcopy ((FROM), (TO), 4) : \
186 (REGNUM < 5) ? i387_to_double((FROM), (TO)) : \
187 (REGNUM < 8) ? bcopy ((FROM), (TO), 4) : \
188 (REGNUM < 14) ? i387_to_double((FROM), (TO)) : \
189 bcopy ((FROM), (TO), 4))
192 i387_to_double
PARAMS ((char *, char *));
194 /* Convert data from virtual format for register REGNUM
195 to raw format for register REGNUM. */
197 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
198 ((REGNUM < 3) ? bcopy ((FROM), (TO), 4) : \
199 (REGNUM < 5) ? double_to_i387((FROM), (TO)) : \
200 (REGNUM < 8) ? bcopy ((FROM), (TO), 4) : \
201 (REGNUM < 14) ? double_to_i387((FROM), (TO)) : \
202 bcopy ((FROM), (TO), 4))
205 double_to_i387
PARAMS ((char *, char *));
207 /* Return the GDB type object for the "standard" data type
208 of data in register N. */
210 #define REGISTER_VIRTUAL_TYPE(N) \
211 ((N < 3) ? builtin_type_int : \
212 (N < 5) ? builtin_type_double : \
213 (N < 8) ? builtin_type_int : \
214 (N < 14) ? builtin_type_double : \
218 /* Store the address of the place in which to copy the structure the
219 subroutine will return. This is called from call_function. */
221 #define STORE_STRUCT_RETURN(ADDR, SP) \
222 { (SP) -= sizeof (ADDR); \
223 write_memory ((SP), &(ADDR), sizeof (ADDR)); \
224 write_register(0, (ADDR)); }
226 /* Extract from an array REGBUF containing the (raw) register state
227 a function return value of type TYPE, and copy that, in virtual format,
230 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
231 symmetry_extract_return_value(TYPE, REGBUF, VALBUF)
233 /* Write into appropriate registers a function return value
234 of type TYPE, given in virtual format. */
236 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
237 write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
239 /* Extract from an array REGBUF containing the (raw) register state
240 the address in which a function should return its structure value,
241 as a CORE_ADDR (or an expression that can be used as one). */
243 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
246 /* Describe the pointer in each stack frame to the previous stack frame
249 /* FRAME_CHAIN takes a frame's nominal address
250 and produces the frame's chain-pointer.
252 However, if FRAME_CHAIN_VALID returns zero,
253 it means the given frame is the outermost one and has no caller. */
255 /* On Symmetry, %ebp points to caller's %ebp, and the return address
256 is right on top of that. */
258 #define FRAME_CHAIN(thisframe) \
259 (!inside_entry_file ((thisframe)->pc) ? \
260 read_memory_integer((thisframe)->frame, 4) :\
263 #define FRAME_CHAIN_VALID(chain, thisframe) \
266 /* Define other aspects of the stack frame. */
268 /* A macro that tells us whether the function invocation represented
269 by FI does not have a frame on the stack associated with it. If it
270 does not, FRAMELESS is set to 1, else 0. */
271 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
272 (FRAMELESS) = frameless_look_for_prologue(FI)
274 #define FRAME_SAVED_PC(fi) (read_memory_integer((fi)->frame + 4, 4))
276 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
278 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
280 /* Return number of args passed to a frame.
281 Can return -1, meaning no way to tell.
283 The weirdness in the "addl $imm8" case is due to gcc sometimes
284 issuing "addl $-int" after function call returns; this would
285 produce ridiculously huge arg counts. */
287 #define FRAME_NUM_ARGS(numargs, fi) \
289 int op = read_memory_integer(FRAME_SAVED_PC((fi)), 4); \
291 if ((op & 0xff) == 0x59) /* 0x59 'popl %ecx' */ \
295 else if ((op & 0xffff) == 0xc483) /* 0xc483 'addl $imm8' */ \
297 narg = ((op >> 16) & 0xff); \
298 numargs = (narg >= 128) ? -1 : narg / 4; \
300 else if ((op & 0xffff) == 0xc481) /* 0xc481 'addl $imm32' */ \
302 narg = read_memory_integer(FRAME_SAVED_PC((fi))+2,4); \
303 numargs = (narg < 0) ? -1 : narg / 4; \
311 /* Return number of bytes at start of arglist that are not really args. */
313 #define FRAME_ARGS_SKIP 8
315 /* Put here the code to store, into a struct frame_saved_regs,
316 the addresses of the saved registers of frame described by FRAME_INFO.
317 This includes special registers such as pc and fp saved in special
318 ways in the stack frame. sp is even more special:
319 the address we return for it IS the sp for the next frame. */
321 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
322 { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); }
324 #ifdef __STDC__ /* Forward decl's for prototypes */
326 struct frame_saved_regs
;
330 i386_frame_find_saved_regs
PARAMS ((struct frame_info
*,
331 struct frame_saved_regs
*));
334 /* Things needed for making the inferior call functions. */
336 #define PUSH_DUMMY_FRAME \
337 { CORE_ADDR sp = read_register (SP_REGNUM); \
339 sp = push_word (sp, read_register (PC_REGNUM)); \
340 sp = push_word (sp, read_register (FP_REGNUM)); \
341 write_register (FP_REGNUM, sp); \
342 for (regnum = 0; regnum < NUM_REGS; regnum++) \
343 sp = push_word (sp, read_register (regnum)); \
344 write_register (SP_REGNUM, sp); \
349 FRAME frame = get_current_frame (); \
352 struct frame_saved_regs fsr; \
353 struct frame_info *fi; \
354 fi = get_frame_info (frame); \
356 get_frame_saved_regs (fi, &fsr); \
357 for (regnum = 0; regnum < NUM_REGS; regnum++) { \
359 adr = fsr.regs[regnum]; \
361 write_register (regnum, read_memory_integer (adr, 4)); \
363 write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
364 write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
365 write_register (SP_REGNUM, fp + 8); \
366 flush_cached_frames (); \
367 set_current_frame ( create_new_frame (read_register (FP_REGNUM), \
371 /* from i386-dep.c, worked better than my original... */
372 /* This sequence of words is the instructions
373 * call (32-bit offset)
378 #define CALL_DUMMY { 0x223344e8, 0xcc11 }
380 #define CALL_DUMMY_LENGTH 8
382 #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
384 /* Insert the specified number of args and function address
385 into a call sequence of the above form stored at DUMMYNAME. */
387 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
389 int from, to, delta, loc; \
390 loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \
394 *(int *)((char *)(dummyname) + 1) = delta; \
398 print_387_control_word
PARAMS ((unsigned int));
401 print_387_status_word
PARAMS ((unsigned int));