1 /* Parameters for targeting on a Gould NP1, for GDB, the GNU debugger.
2 Copyright (C) 1986, 1987, 1989 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #define TARGET_BYTE_ORDER BIG_ENDIAN
24 /* N_ENTRY appears in libraries on Gould machines.
25 Don't know what 0xa4 is; it's mentioned in stab.h
26 but only in the sdb symbol list. */
27 #define IGNORE_SYMBOL(type) (type == N_ENTRY || type == 0xa4)
29 /* We don't want the extra gnu symbols on the machine;
30 they will interfere with the shared segment symbols. */
33 /* Macro for text-offset and data info (in NPL a.out format). */
35 text_offset = N_TXTOFF (exec_coffhdr, exec_aouthdr); \
36 exec_data_offset = N_TXTOFF (exec_coffhdr, exec_aouthdr)\
39 /* Macro for number of symbol table entries */
40 #define NUMBER_OF_SYMBOLS \
43 /* Macro for file-offset of symbol table (in NPL a.out format). */
44 #define SYMBOL_TABLE_OFFSET \
47 /* Macro for file-offset of string table (in NPL a.out format). */
48 #define STRING_TABLE_OFFSET \
51 /* Macro to store the length of the string table data in INTO. */
52 #define READ_STRING_TABLE_SIZE(INTO) \
53 { INTO = hdr.a_stsize; }
55 /* Macro to declare variables to hold the file's header data. */
56 #define DECLARE_FILE_HEADERS struct exec hdr; \
59 /* Macro to read the header data from descriptor DESC and validate it.
60 NAME is the file name, for error messages. */
61 #define READ_FILE_HEADERS(DESC, NAME) \
62 { val = myread (DESC, &coffhdr, sizeof coffhdr); \
64 perror_with_name (NAME); \
65 val = myread (DESC, &hdr, sizeof hdr); \
67 perror_with_name (NAME); \
68 if (coffhdr.f_magic != GNP1MAGIC) \
69 error ("File \"%s\" not in coff executable format.", NAME); \
71 error ("File \"%s\" not in executable format.", NAME); }
73 /* Define COFF and other symbolic names needed on NP1 */
74 #define NS32GMAGIC GNP1MAGIC
75 #define NS32SMAGIC GPNMAGIC
77 /* Define this if the C compiler puts an underscore at the front
78 of external names before giving them to the linker. */
79 #define NAMES_HAVE_UNDERSCORE
81 /* Debugger information will be in DBX format. */
82 #define READ_DBX_FORMAT
84 /* Address of blocks in N_LBRAC and N_RBRAC symbols are absolute addresses,
85 not relative to start of source address. */
86 #define BLOCK_ADDRESS_ABSOLUTE
88 /* Offset from address of function to start of its code.
89 Zero on most machines. */
90 #define FUNCTION_START_OFFSET 8
92 /* Advance PC across any function entry prologue instructions
93 to reach some "real" code. One NPL we can have one two startup
94 sequences depending on the size of the local stack:
99 "lil r4, #", "suabr b2, #(r4)"
101 "lwbr b6, #", "stw r1, 8(b2)"
102 Optional "stwbr b3, c(b2)"
103 Optional "trr r2,r7" (Gould first argument register passing)
105 Optional "stw r2,8(b3)" (Gould first argument register passing)
107 #define SKIP_PROLOGUE(pc) { \
108 register int op = read_memory_integer ((pc), 4); \
109 if ((op & 0xffff0000) == 0xFA0B0000) { \
111 op = read_memory_integer ((pc), 4); \
112 if ((op & 0xffff0000) == 0x59400000) { \
114 op = read_memory_integer ((pc), 4); \
115 if ((op & 0xffff0000) == 0x5F000000) { \
117 op = read_memory_integer ((pc), 4); \
118 if (op == 0xD4820008) { \
120 op = read_memory_integer ((pc), 4); \
121 if (op == 0x5582000C) { \
123 op = read_memory_integer ((pc), 2); \
124 if (op == 0x2fa0) { \
127 op = read_memory_integer ((pc), 4); \
128 if (op == 0xd5030008) { \
133 op = read_memory_integer ((pc), 2); \
134 if (op == 0x2fa0) { \
142 if ((op & 0xffff0000) == 0x59000000) { \
144 op = read_memory_integer ((pc), 4); \
145 if ((op & 0xffff0000) == 0x5F000000) { \
147 op = read_memory_integer ((pc), 4); \
148 if (op == 0xD4820008) { \
150 op = read_memory_integer ((pc), 4); \
151 if (op == 0x5582000C) { \
153 op = read_memory_integer ((pc), 2); \
154 if (op == 0x2fa0) { \
157 op = read_memory_integer ((pc), 4); \
158 if (op == 0xd5030008) { \
163 op = read_memory_integer ((pc), 2); \
164 if (op == 0x2fa0) { \
173 /* Immediately after a function call, return the saved pc.
174 Can't go through the frames for this because on some machines
175 the new frame is not set up until the new function executes
176 some instructions. True on NPL! Return address is in R1.
177 The true return address is REALLY 4 past that location! */
178 #define SAVED_PC_AFTER_CALL(frame) \
179 (read_register(R1_REGNUM) + 4)
181 /* Address of end of stack space. */
182 #define STACK_END_ADDR 0x7fffc000
184 /* Stack grows downward. */
187 /* Sequence of bytes for breakpoint instruction.
188 This is padded out to the size of a machine word. When it was just
189 {0x28, 0x09} it gave problems if hit breakpoint on returning from a
191 #define BREAKPOINT {0x28, 0x09, 0x0, 0x0}
193 /* Amount PC must be decremented by after a breakpoint.
194 This is often the number of bytes in BREAKPOINT
196 #define DECR_PC_AFTER_BREAK 2
198 /* Nonzero if instruction at PC is a return instruction. "bu 4(r1)" */
199 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x40100004)
201 /* Return 1 if P points to an invalid floating point value. */
202 #define INVALID_FLOAT(p, len) ((*(short *)p & 0xff80) == 0x8000)
204 /* Say how long (ordinary) registers are. */
205 #define REGISTER_TYPE long
207 /* Size of bytes of vector register (NP1 only), 32 elements * sizeof(int) */
210 /* Number of machine registers */
212 #define NUM_GEN_REGS 16
213 #define NUM_CPU_REGS 4
214 #define NUM_VECTOR_REGS 7
216 /* Initializer for an array of names of registers.
217 There should be NUM_REGS strings in this initializer. */
218 #define REGISTER_NAMES { \
219 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
220 "b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", \
221 "sp", "ps", "pc", "ve", \
222 "v1", "v2", "v3", "v4", "v5", "v6", "v7", \
225 /* Register numbers of various important registers.
226 Note that some of these values are "real" register numbers,
227 and correspond to the general registers of the machine,
228 and some are "phony" register numbers which are too large
229 to be actual register numbers as far as the user is concerned
230 but do serve to get the desired values when passed to read_register. */
231 #define R1_REGNUM 1 /* Gr1 => return address of caller */
232 #define R2_REGNUM 2 /* Gr2 => return value from function */
233 #define R4_REGNUM 4 /* Gr4 => register save area */
234 #define R5_REGNUM 5 /* Gr5 => register save area */
235 #define R6_REGNUM 6 /* Gr6 => register save area */
236 #define R7_REGNUM 7 /* Gr7 => register save area */
237 #define B1_REGNUM 9 /* Br1 => start of this code routine */
238 #define SP_REGNUM 10 /* Br2 == (sp) */
239 #define AP_REGNUM 11 /* Br3 == (ap) */
240 #define FP_REGNUM 16 /* A copy of Br2 saved in trap */
241 #define PS_REGNUM 17 /* Contains processor status */
242 #define PC_REGNUM 18 /* Contains program counter */
243 #define VE_REGNUM 19 /* Vector end (user setup) register */
244 #define V1_REGNUM 20 /* First vector register */
245 #define V7_REGNUM 26 /* First vector register */
247 /* Total amount of space needed to store our copies of the machine's
248 register state, the array `registers'. */
249 #define REGISTER_BYTES \
250 (NUM_GEN_REGS*4 + NUM_VECTOR_REGS*VR_SIZE + NUM_CPU_REGS*4)
252 /* Index within `registers' of the first byte of the space for
254 #define REGISTER_BYTE(N) \
255 (((N) < V1_REGNUM) ? ((N) * 4) : (((N) - V1_REGNUM) * VR_SIZE) + 80)
257 /* Number of bytes of storage in the actual machine representation
258 for register N. On the NP1, all normal regs are 4 bytes, but
259 the vector registers are VR_SIZE*4 bytes long. */
260 #define REGISTER_RAW_SIZE(N) \
261 (((N) < V1_REGNUM) ? 4 : VR_SIZE)
263 /* Number of bytes of storage in the program's representation
264 for register N. On the NP1, all regs are 4 bytes. */
265 #define REGISTER_VIRTUAL_SIZE(N) \
266 (((N) < V1_REGNUM) ? 4 : VR_SIZE)
268 /* Largest value REGISTER_RAW_SIZE can have. */
269 #define MAX_REGISTER_RAW_SIZE VR_SIZE
271 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
272 #define MAX_REGISTER_VIRTUAL_SIZE VR_SIZE
274 /* Nonzero if register N requires conversion
275 from raw format to virtual format. */
276 #define REGISTER_CONVERTIBLE(N) (0)
278 /* Convert data from raw format for register REGNUM
279 to virtual format for register REGNUM. */
280 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
281 bcopy ((FROM), (TO), REGISTER_RAW_SIZE(REGNUM));
283 /* Convert data from virtual format for register REGNUM
284 to raw format for register REGNUM. */
285 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
286 bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
288 /* Return the GDB type object for the "standard" data type
289 of data in register N. */
290 #define REGISTER_VIRTUAL_TYPE(N) \
291 ((N) > VE_REGNUM ? builtin_type_np1_vector : builtin_type_int)
292 extern struct type *builtin_type_np1_vector;
294 /* Store the address of the place in which to copy the structure the
295 subroutine will return. This is called from call_function.
297 On this machine this is a no-op, because gcc isn't used on it
298 yet. So this calling convention is not used. */
300 #define STORE_STRUCT_RETURN(ADDR, SP) push_word(SP + 8, ADDR)
302 /* Extract from an arrary REGBUF containing the (raw) register state
303 a function return value of type TYPE, and copy that, in virtual format,
306 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
307 bcopy (((int *)(REGBUF)) + 2, VALBUF, TYPE_LENGTH (TYPE))
309 /* Write into appropriate registers a function return value
310 of type TYPE, given in virtual format. */
312 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
313 write_register_bytes (REGISTER_BYTE (R2_REGNUM), VALBUF, \
316 /* Extract from an array REGBUF containing the (raw) register state
317 the address in which a function should return its structure value,
318 as a CORE_ADDR (or an expression that can be used as one). */
320 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*((int *)(REGBUF) + 2))
322 /* Both gcc and cc return small structs in registers (i.e. in GDB
323 terminology, small structs don't use the struct return convention). */
324 #define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH(type) > 8)
326 /* Describe the pointer in each stack frame to the previous stack frame
329 /* FRAME_CHAIN takes a frame's nominal address
330 and produces the frame's chain-pointer.
332 FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
333 and produces the nominal address of the caller frame.
335 However, if FRAME_CHAIN_VALID returns zero,
336 it means the given frame is the outermost one and has no caller.
337 In that case, FRAME_CHAIN_COMBINE is not used. */
339 /* In the case of the NPL, the frame's norminal address is Br2 and the
340 previous routines frame is up the stack X bytes, where X is the
341 value stored in the code function header xA(Br1). */
342 #define FRAME_CHAIN(thisframe) (findframe(thisframe))
344 #define FRAME_CHAIN_VALID(chain, thisframe) \
345 (chain != 0 && chain != (thisframe)->frame)
347 #define FRAME_CHAIN_COMBINE(chain, thisframe) \
350 /* Define other aspects of the stack frame on NPL. */
351 #define FRAME_SAVED_PC(FRAME) \
352 (read_memory_integer ((FRAME)->frame + 8, 4))
354 #define FRAME_ARGS_ADDRESS(fi) \
355 ((fi)->next_frame ? \
356 read_memory_integer ((fi)->frame + 12, 4) : \
357 read_register (AP_REGNUM))
359 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
361 /* Set VAL to the number of args passed to frame described by FI.
362 Can set VAL to -1, meaning no way to tell. */
364 /* We can check the stab info to see how
365 many arg we have. No info in stack will tell us */
366 #define FRAME_NUM_ARGS(val,fi) (val = findarg(fi))
368 /* Return number of bytes at start of arglist that are not really args. */
369 #define FRAME_ARGS_SKIP 8
371 /* Put here the code to store, into a struct frame_saved_regs,
372 the addresses of the saved registers of frame described by FRAME_INFO.
373 This includes special registers such as pc and fp saved in special
374 ways in the stack frame. sp is even more special:
375 the address we return for it IS the sp for the next frame. */
377 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
379 bzero (&frame_saved_regs, sizeof frame_saved_regs); \
380 (frame_saved_regs).regs[SP_REGNUM] = framechain (frame_info); \
381 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 8; \
382 (frame_saved_regs).regs[R4_REGNUM] = (frame_info)->frame + 0x30; \
383 (frame_saved_regs).regs[R5_REGNUM] = (frame_info)->frame + 0x34; \
384 (frame_saved_regs).regs[R6_REGNUM] = (frame_info)->frame + 0x38; \
385 (frame_saved_regs).regs[R7_REGNUM] = (frame_info)->frame + 0x3C; \
388 /* Things needed for making the inferior call functions. */
390 #define CANNOT_EXECUTE_STACK
392 /* Push an empty stack frame, to record the current PC, etc. */
394 #define PUSH_DUMMY_FRAME \
395 { register CORE_ADDR sp = read_register (SP_REGNUM); \
396 register int regnum; \
397 for (regnum = 0; regnum < FP_REGNUM; regnum++) \
398 sp = push_word (sp, read_register (regnum)); \
399 sp = push_word (sp, read_register (PS_REGNUM)); \
400 sp = push_word (sp, read_register (PC_REGNUM)); \
401 write_register (SP_REGNUM, sp);}
403 /* Discard from the stack the innermost frame,
404 restoring all saved registers. */
407 { CORE_ADDR sp = read_register(SP_REGNUM); \
410 for(regnum = 0;regnum < FP_REGNUM;regnum++){ \
411 sp-=sizeof(REGISTER_TYPE); \
412 read_memory(sp,®,sizeof(REGISTER_TYPE)); \
413 write_register(regnum,reg);} \
414 sp-=sizeof(REGISTER_TYPE); \
415 read_memory(sp,®,sizeof(REGISTER_TYPE)); \
416 write_register(PS_REGNUM,reg); \
417 sp-=sizeof(REGISTER_TYPE); \
418 read_memory(sp,®,sizeof(REGISTER_TYPE)); \
419 write_register(PC_REGNUM,reg);}
421 /* MJD - Size of dummy frame pushed onto stack by PUSH_DUMMY_FRAME */
423 #define DUMMY_FRAME_SIZE (0x48)
425 /* MJD - The sequence of words in the instructions is
430 subr b2,stack size,0 grab stack space for dummy call
431 labr b3,x0(b2),0 set AP_REGNUM to point at arguments
432 lw r2,x8(b3),0 load r2 with first argument
433 lwbr b1,arguments size(b2),0 load address of function to be called
434 brlnk r1,x8(b1),0 call function
437 labr b2,stack size(b2),0 give back stack
441 #define CALL_DUMMY {0x00000000, \
452 #define CALL_DUMMY_LENGTH 40
454 #define CALL_DUMMY_START_OFFSET 8
456 #define CALL_DUMMY_STACK_ADJUST 8
458 /* MJD - Fixup CALL_DUMMY for the specific function call.
459 OK heres the problems
460 1) On a trap there are two copies of the stack pointer, one in SP_REGNUM
461 which is read/write and one in FP_REGNUM which is only read. It seems
462 that when restarting the GOULD NP1 uses FP_REGNUM's value.
463 2) Loading function address into b1 looks a bit difficult if bigger than
464 0x0000fffc, infact from what I can tell the compiler sets up table of
465 function address in base3 through which function calls are referenced.
468 Calculate the size of the dummy stack frame and do adjustments of
469 SP_REGNUM in the dummy call.
470 Push function address onto the stack and load it in the dummy call
473 #define FIX_CALL_DUMMY(dummyname, sp, fun, nargs, args, type, gcc_p) \
475 int arg_len = 0, total_len;\
476 old_sp = push_word(old_sp,fun);\
477 for(i = nargs - 1;i >= 0;i--)\
478 arg_len += TYPE_LENGTH (VALUE_TYPE (value_arg_coerce (args[i])));\
480 arg_len += TYPE_LENGTH(value_type);\
481 total_len = DUMMY_FRAME_SIZE+CALL_DUMMY_STACK_ADJUST+4+arg_len;\
482 dummyname[0] += total_len;\
483 dummyname[2] += total_len;\
484 dummyname[5] += arg_len+CALL_DUMMY_STACK_ADJUST;\
485 dummyname[8] += total_len;}
487 /* MJD - So the stack should end up looking like this
489 | Normal stack frame |
490 | from normal program |
492 +---------------------+ <- Final sp - 0x08 - argument size
493 | | - 0x4 - dummy_frame_size
494 | Pushed dummy frame |
498 +---------------------+
500 +---------------------+ <- Final sp - 0x8 - arguments size
509 +---------------------+ <- Final sp - 0x8
510 | Dummy_stack_adjust |
511 +---------------------+ <- Final sp