1 /* Parameters for targeting on a Gould NP1, for GDB, the GNU debugger.
2 Copyright (C) 1986, 1987, 1989, 1991 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 /* Address of blocks in N_LBRAC and N_RBRAC symbols are absolute addresses,
82 not relative to start of source address. */
83 #define BLOCK_ADDRESS_ABSOLUTE
85 /* Offset from address of function to start of its code.
86 Zero on most machines. */
87 #define FUNCTION_START_OFFSET 8
89 /* Advance PC across any function entry prologue instructions
90 to reach some "real" code. One NPL we can have one two startup
91 sequences depending on the size of the local stack:
96 "lil r4, #", "suabr b2, #(r4)"
98 "lwbr b6, #", "stw r1, 8(b2)"
99 Optional "stwbr b3, c(b2)"
100 Optional "trr r2,r7" (Gould first argument register passing)
102 Optional "stw r2,8(b3)" (Gould first argument register passing)
104 #define SKIP_PROLOGUE(pc) { \
105 register int op = read_memory_integer ((pc), 4); \
106 if ((op & 0xffff0000) == 0xFA0B0000) { \
108 op = read_memory_integer ((pc), 4); \
109 if ((op & 0xffff0000) == 0x59400000) { \
111 op = read_memory_integer ((pc), 4); \
112 if ((op & 0xffff0000) == 0x5F000000) { \
114 op = read_memory_integer ((pc), 4); \
115 if (op == 0xD4820008) { \
117 op = read_memory_integer ((pc), 4); \
118 if (op == 0x5582000C) { \
120 op = read_memory_integer ((pc), 2); \
121 if (op == 0x2fa0) { \
124 op = read_memory_integer ((pc), 4); \
125 if (op == 0xd5030008) { \
130 op = read_memory_integer ((pc), 2); \
131 if (op == 0x2fa0) { \
139 if ((op & 0xffff0000) == 0x59000000) { \
141 op = read_memory_integer ((pc), 4); \
142 if ((op & 0xffff0000) == 0x5F000000) { \
144 op = read_memory_integer ((pc), 4); \
145 if (op == 0xD4820008) { \
147 op = read_memory_integer ((pc), 4); \
148 if (op == 0x5582000C) { \
150 op = read_memory_integer ((pc), 2); \
151 if (op == 0x2fa0) { \
154 op = read_memory_integer ((pc), 4); \
155 if (op == 0xd5030008) { \
160 op = read_memory_integer ((pc), 2); \
161 if (op == 0x2fa0) { \
170 /* Immediately after a function call, return the saved pc.
171 Can't go through the frames for this because on some machines
172 the new frame is not set up until the new function executes
173 some instructions. True on NPL! Return address is in R1.
174 The true return address is REALLY 4 past that location! */
175 #define SAVED_PC_AFTER_CALL(frame) \
176 (read_register(R1_REGNUM) + 4)
178 /* Address of end of stack space. */
179 #define STACK_END_ADDR 0x7fffc000
181 /* Stack grows downward. */
184 /* Sequence of bytes for breakpoint instruction.
185 This is padded out to the size of a machine word. When it was just
186 {0x28, 0x09} it gave problems if hit breakpoint on returning from a
188 #define BREAKPOINT {0x28, 0x09, 0x0, 0x0}
190 /* Amount PC must be decremented by after a breakpoint.
191 This is often the number of bytes in BREAKPOINT
193 #define DECR_PC_AFTER_BREAK 2
195 /* Nonzero if instruction at PC is a return instruction. "bu 4(r1)" */
196 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x40100004)
198 /* Return 1 if P points to an invalid floating point value. */
199 #define INVALID_FLOAT(p, len) ((*(short *)p & 0xff80) == 0x8000)
201 /* Say how long (ordinary) registers are. */
202 #define REGISTER_TYPE long
204 /* Size of bytes of vector register (NP1 only), 32 elements * sizeof(int) */
207 /* Number of machine registers */
209 #define NUM_GEN_REGS 16
210 #define NUM_CPU_REGS 4
211 #define NUM_VECTOR_REGS 7
213 /* Initializer for an array of names of registers.
214 There should be NUM_REGS strings in this initializer. */
215 #define REGISTER_NAMES { \
216 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
217 "b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", \
218 "sp", "ps", "pc", "ve", \
219 "v1", "v2", "v3", "v4", "v5", "v6", "v7", \
222 /* Register numbers of various important registers.
223 Note that some of these values are "real" register numbers,
224 and correspond to the general registers of the machine,
225 and some are "phony" register numbers which are too large
226 to be actual register numbers as far as the user is concerned
227 but do serve to get the desired values when passed to read_register. */
228 #define R1_REGNUM 1 /* Gr1 => return address of caller */
229 #define R2_REGNUM 2 /* Gr2 => return value from function */
230 #define R4_REGNUM 4 /* Gr4 => register save area */
231 #define R5_REGNUM 5 /* Gr5 => register save area */
232 #define R6_REGNUM 6 /* Gr6 => register save area */
233 #define R7_REGNUM 7 /* Gr7 => register save area */
234 #define B1_REGNUM 9 /* Br1 => start of this code routine */
235 #define SP_REGNUM 10 /* Br2 == (sp) */
236 #define AP_REGNUM 11 /* Br3 == (ap) */
237 #define FP_REGNUM 16 /* A copy of Br2 saved in trap */
238 #define PS_REGNUM 17 /* Contains processor status */
239 #define PC_REGNUM 18 /* Contains program counter */
240 #define VE_REGNUM 19 /* Vector end (user setup) register */
241 #define V1_REGNUM 20 /* First vector register */
242 #define V7_REGNUM 26 /* First vector register */
244 /* Total amount of space needed to store our copies of the machine's
245 register state, the array `registers'. */
246 #define REGISTER_BYTES \
247 (NUM_GEN_REGS*4 + NUM_VECTOR_REGS*VR_SIZE + NUM_CPU_REGS*4)
249 /* Index within `registers' of the first byte of the space for
251 #define REGISTER_BYTE(N) \
252 (((N) < V1_REGNUM) ? ((N) * 4) : (((N) - V1_REGNUM) * VR_SIZE) + 80)
254 /* Number of bytes of storage in the actual machine representation
255 for register N. On the NP1, all normal regs are 4 bytes, but
256 the vector registers are VR_SIZE*4 bytes long. */
257 #define REGISTER_RAW_SIZE(N) \
258 (((N) < V1_REGNUM) ? 4 : VR_SIZE)
260 /* Number of bytes of storage in the program's representation
261 for register N. On the NP1, all regs are 4 bytes. */
262 #define REGISTER_VIRTUAL_SIZE(N) \
263 (((N) < V1_REGNUM) ? 4 : VR_SIZE)
265 /* Largest value REGISTER_RAW_SIZE can have. */
266 #define MAX_REGISTER_RAW_SIZE VR_SIZE
268 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
269 #define MAX_REGISTER_VIRTUAL_SIZE VR_SIZE
271 /* Nonzero if register N requires conversion
272 from raw format to virtual format. */
273 #define REGISTER_CONVERTIBLE(N) (0)
275 /* Convert data from raw format for register REGNUM
276 to virtual format for register REGNUM. */
277 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
278 bcopy ((FROM), (TO), REGISTER_RAW_SIZE(REGNUM));
280 /* Convert data from virtual format for register REGNUM
281 to raw format for register REGNUM. */
282 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
283 bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
285 /* Return the GDB type object for the "standard" data type
286 of data in register N. */
287 #define REGISTER_VIRTUAL_TYPE(N) \
288 ((N) > VE_REGNUM ? builtin_type_np1_vector : builtin_type_int)
289 extern struct type *builtin_type_np1_vector;
291 /* Store the address of the place in which to copy the structure the
292 subroutine will return. This is called from call_function.
294 On this machine this is a no-op, because gcc isn't used on it
295 yet. So this calling convention is not used. */
297 #define STORE_STRUCT_RETURN(ADDR, SP) push_word(SP + 8, ADDR)
299 /* Extract from an arrary REGBUF containing the (raw) register state
300 a function return value of type TYPE, and copy that, in virtual format,
303 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
304 bcopy (((int *)(REGBUF)) + 2, VALBUF, TYPE_LENGTH (TYPE))
306 /* Write into appropriate registers a function return value
307 of type TYPE, given in virtual format. */
309 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
310 write_register_bytes (REGISTER_BYTE (R2_REGNUM), VALBUF, \
313 /* Extract from an array REGBUF containing the (raw) register state
314 the address in which a function should return its structure value,
315 as a CORE_ADDR (or an expression that can be used as one). */
317 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*((int *)(REGBUF) + 2))
319 /* Both gcc and cc return small structs in registers (i.e. in GDB
320 terminology, small structs don't use the struct return convention). */
321 #define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH(type) > 8)
323 /* Describe the pointer in each stack frame to the previous stack frame
326 /* FRAME_CHAIN takes a frame's nominal address
327 and produces the frame's chain-pointer.
329 FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
330 and produces the nominal address of the caller frame.
332 However, if FRAME_CHAIN_VALID returns zero,
333 it means the given frame is the outermost one and has no caller.
334 In that case, FRAME_CHAIN_COMBINE is not used. */
336 /* In the case of the NPL, the frame's norminal address is Br2 and the
337 previous routines frame is up the stack X bytes, where X is the
338 value stored in the code function header xA(Br1). */
339 #define FRAME_CHAIN(thisframe) (findframe(thisframe))
341 #define FRAME_CHAIN_VALID(chain, thisframe) \
342 (chain != 0 && chain != (thisframe)->frame)
344 #define FRAME_CHAIN_COMBINE(chain, thisframe) \
347 /* Define other aspects of the stack frame on NPL. */
348 #define FRAME_SAVED_PC(FRAME) \
349 (read_memory_integer ((FRAME)->frame + 8, 4))
351 #define FRAME_ARGS_ADDRESS(fi) \
352 ((fi)->next_frame ? \
353 read_memory_integer ((fi)->frame + 12, 4) : \
354 read_register (AP_REGNUM))
356 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
358 /* Set VAL to the number of args passed to frame described by FI.
359 Can set VAL to -1, meaning no way to tell. */
361 /* We can check the stab info to see how
362 many arg we have. No info in stack will tell us */
363 #define FRAME_NUM_ARGS(val,fi) (val = findarg(fi))
365 /* Return number of bytes at start of arglist that are not really args. */
366 #define FRAME_ARGS_SKIP 8
368 /* Put here the code to store, into a struct frame_saved_regs,
369 the addresses of the saved registers of frame described by FRAME_INFO.
370 This includes special registers such as pc and fp saved in special
371 ways in the stack frame. sp is even more special:
372 the address we return for it IS the sp for the next frame. */
374 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
376 bzero (&frame_saved_regs, sizeof frame_saved_regs); \
377 (frame_saved_regs).regs[SP_REGNUM] = framechain (frame_info); \
378 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 8; \
379 (frame_saved_regs).regs[R4_REGNUM] = (frame_info)->frame + 0x30; \
380 (frame_saved_regs).regs[R5_REGNUM] = (frame_info)->frame + 0x34; \
381 (frame_saved_regs).regs[R6_REGNUM] = (frame_info)->frame + 0x38; \
382 (frame_saved_regs).regs[R7_REGNUM] = (frame_info)->frame + 0x3C; \
385 /* Things needed for making the inferior call functions. */
387 #define CALL_DUMMY_LOCATION BEFORE_TEXT_END
388 #define NEED_TEXT_START_END
390 /* Push an empty stack frame, to record the current PC, etc. */
392 #define PUSH_DUMMY_FRAME \
393 { register CORE_ADDR sp = read_register (SP_REGNUM); \
394 register int regnum; \
395 for (regnum = 0; regnum < FP_REGNUM; regnum++) \
396 sp = push_word (sp, read_register (regnum)); \
397 sp = push_word (sp, read_register (PS_REGNUM)); \
398 sp = push_word (sp, read_register (PC_REGNUM)); \
399 write_register (SP_REGNUM, sp);}
401 /* Discard from the stack the innermost frame,
402 restoring all saved registers. */
405 { CORE_ADDR sp = read_register(SP_REGNUM); \
408 for(regnum = 0;regnum < FP_REGNUM;regnum++){ \
409 sp-=sizeof(REGISTER_TYPE); \
410 read_memory(sp,®,sizeof(REGISTER_TYPE)); \
411 write_register(regnum,reg);} \
412 sp-=sizeof(REGISTER_TYPE); \
413 read_memory(sp,®,sizeof(REGISTER_TYPE)); \
414 write_register(PS_REGNUM,reg); \
415 sp-=sizeof(REGISTER_TYPE); \
416 read_memory(sp,®,sizeof(REGISTER_TYPE)); \
417 write_register(PC_REGNUM,reg);}
419 /* MJD - Size of dummy frame pushed onto stack by PUSH_DUMMY_FRAME */
421 #define DUMMY_FRAME_SIZE (0x48)
423 /* MJD - The sequence of words in the instructions is
428 subr b2,stack size,0 grab stack space for dummy call
429 labr b3,x0(b2),0 set AP_REGNUM to point at arguments
430 lw r2,x8(b3),0 load r2 with first argument
431 lwbr b1,arguments size(b2),0 load address of function to be called
432 brlnk r1,x8(b1),0 call function
435 labr b2,stack size(b2),0 give back stack
439 #define CALL_DUMMY {0x00000000, \
450 #define CALL_DUMMY_LENGTH 40
452 #define CALL_DUMMY_START_OFFSET 8
454 #define CALL_DUMMY_STACK_ADJUST 8
456 /* MJD - Fixup CALL_DUMMY for the specific function call.
457 OK heres the problems
458 1) On a trap there are two copies of the stack pointer, one in SP_REGNUM
459 which is read/write and one in FP_REGNUM which is only read. It seems
460 that when restarting the GOULD NP1 uses FP_REGNUM's value.
461 2) Loading function address into b1 looks a bit difficult if bigger than
462 0x0000fffc, infact from what I can tell the compiler sets up table of
463 function address in base3 through which function calls are referenced.
466 Calculate the size of the dummy stack frame and do adjustments of
467 SP_REGNUM in the dummy call.
468 Push function address onto the stack and load it in the dummy call
471 #define FIX_CALL_DUMMY(dummyname, sp, fun, nargs, args, type, gcc_p) \
473 int arg_len = 0, total_len;\
474 old_sp = push_word(old_sp,fun);\
475 for(i = nargs - 1;i >= 0;i--)\
476 arg_len += TYPE_LENGTH (VALUE_TYPE (value_arg_coerce (args[i])));\
478 arg_len += TYPE_LENGTH(value_type);\
479 total_len = DUMMY_FRAME_SIZE+CALL_DUMMY_STACK_ADJUST+4+arg_len;\
480 dummyname[0] += total_len;\
481 dummyname[2] += total_len;\
482 dummyname[5] += arg_len+CALL_DUMMY_STACK_ADJUST;\
483 dummyname[8] += total_len;}
485 /* MJD - So the stack should end up looking like this
487 | Normal stack frame |
488 | from normal program |
490 +---------------------+ <- Final sp - 0x08 - argument size
491 | | - 0x4 - dummy_frame_size
492 | Pushed dummy frame |
496 +---------------------+
498 +---------------------+ <- Final sp - 0x8 - arguments size
507 +---------------------+ <- Final sp - 0x8
508 | Dummy_stack_adjust |
509 +---------------------+ <- Final sp