1 /* Target dependent code for the NS32000, for GDB.
3 Copyright 1986, 1988, 1991, 1992, 1994, 1995, 1998, 1999, 2000,
4 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
30 #include "arch-utils.h"
34 #include "ns32k-tdep.h"
35 #include "gdb_string.h"
37 static int sign_extend (int value, int bits);
38 static CORE_ADDR ns32k_get_enter_addr (CORE_ADDR);
39 static int ns32k_localcount (CORE_ADDR enter_pc);
40 static void flip_bytes (void *, int);
43 ns32k_register_name_32082 (int regno)
45 static char *register_names[] =
47 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
48 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
49 "sp", "fp", "pc", "ps",
50 "l0", "l1", "l2", "l3", "xx",
55 if (regno >= sizeof (register_names) / sizeof (*register_names))
58 return (register_names[regno]);
62 ns32k_register_name_32382 (int regno)
64 static char *register_names[] =
66 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
67 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
68 "sp", "fp", "pc", "ps",
70 "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7", "xx",
75 if (regno >= sizeof (register_names) / sizeof (*register_names))
78 return (register_names[regno]);
82 ns32k_register_byte_32082 (int regno)
84 if (regno >= NS32K_LP0_REGNUM)
85 return (NS32K_LP0_REGNUM * 4) + ((regno - NS32K_LP0_REGNUM) * 8);
91 ns32k_register_byte_32382 (int regno)
93 /* This is a bit yuk. The even numbered double precision floating
94 point long registers occupy the same space as the even:odd numbered
95 single precision floating point registers, but the extra 32381 FPU
96 registers are at the end. Doing it this way is compatible for both
97 32081 and 32381 equipped machines. */
99 return ((regno < NS32K_LP0_REGNUM ? regno
100 : (regno - NS32K_LP0_REGNUM) & 1 ? regno - 1
101 : (regno - NS32K_LP0_REGNUM + FP0_REGNUM)) * 4);
105 ns32k_register_raw_size (int regno)
107 /* All registers are 4 bytes, except for the doubled floating
110 return ((regno >= NS32K_LP0_REGNUM) ? 8 : 4);
114 ns32k_register_virtual_size (int regno)
116 return ((regno >= NS32K_LP0_REGNUM) ? 8 : 4);
120 ns32k_register_virtual_type (int regno)
122 if (regno < FP0_REGNUM)
123 return (builtin_type_int);
125 if (regno < FP0_REGNUM + 8)
126 return (builtin_type_float);
128 if (regno < NS32K_LP0_REGNUM)
129 return (builtin_type_int);
131 return (builtin_type_double);
134 /* Immediately after a function call, return the saved PC. Can't
135 always go through the frames for this because on some systems,
136 the new frame is not set up until the new function executes some
140 ns32k_saved_pc_after_call (struct frame_info *frame)
142 return (read_memory_integer (read_register (SP_REGNUM), 4));
145 /* Advance PC across any function entry prologue instructions
146 to reach some "real" code. */
149 umax_skip_prologue (CORE_ADDR pc)
151 unsigned char op = read_memory_integer (pc, 1);
154 op = read_memory_integer (pc + 2, 1);
155 if ((op & 0x80) == 0)
157 else if ((op & 0xc0) == 0x80)
165 static const unsigned char *
166 ns32k_breakpoint_from_pc (CORE_ADDR *pcp, int *lenp)
168 static const unsigned char breakpoint_insn[] = { 0xf2 };
170 *lenp = sizeof (breakpoint_insn);
171 return breakpoint_insn;
174 /* Return number of args passed to a frame.
175 Can return -1, meaning no way to tell.
176 Encore's C compiler often reuses same area on stack for args,
177 so this will often not work properly. If the arg names
178 are known, it's likely most of them will be printed. */
181 umax_frame_num_args (struct frame_info *fi)
185 CORE_ADDR enter_addr;
187 unsigned int addr_mode;
191 enter_addr = ns32k_get_enter_addr (get_frame_pc (fi));
194 pc = ((enter_addr == 1)
195 ? DEPRECATED_SAVED_PC_AFTER_CALL (fi)
196 : DEPRECATED_FRAME_SAVED_PC (fi));
197 insn = read_memory_integer (pc, 2);
198 addr_mode = (insn >> 11) & 0x1f;
200 if ((insn & 0x7fc) == 0x57c
201 && addr_mode == 0x14) /* immediate */
203 if (insn == 0x57c) /* adjspb */
205 else if (insn == 0x57d) /* adjspw */
207 else if (insn == 0x57f) /* adjspd */
210 internal_error (__FILE__, __LINE__, "bad else");
211 numargs = read_memory_integer (pc + 2, width);
213 flip_bytes (&numargs, width);
214 numargs = -sign_extend (numargs, width * 8) / 4;
221 sign_extend (int value, int bits)
223 value = value & ((1 << bits) - 1);
224 return (value & (1 << (bits - 1))
225 ? value | (~((1 << bits) - 1))
230 flip_bytes (void *p, int count)
238 ptr[0] = ptr[count - 1];
239 ptr[count - 1] = tmp;
245 /* Return the number of locals in the current frame given a
246 pc pointing to the enter instruction. This is used by
247 ns32k_frame_init_saved_regs. */
250 ns32k_localcount (CORE_ADDR enter_pc)
252 unsigned char localtype;
255 localtype = read_memory_integer (enter_pc + 2, 1);
256 if ((localtype & 0x80) == 0)
257 localcount = localtype;
258 else if ((localtype & 0xc0) == 0x80)
259 localcount = (((localtype & 0x3f) << 8)
260 | (read_memory_integer (enter_pc + 3, 1) & 0xff));
262 localcount = (((localtype & 0x3f) << 24)
263 | ((read_memory_integer (enter_pc + 3, 1) & 0xff) << 16)
264 | ((read_memory_integer (enter_pc + 4, 1) & 0xff) << 8)
265 | (read_memory_integer (enter_pc + 5, 1) & 0xff));
270 /* Nonzero if instruction at PC is a return instruction. */
273 ns32k_about_to_return (CORE_ADDR pc)
275 return (read_memory_integer (pc, 1) == 0x12);
278 /* Get the address of the enter opcode for this function, if it is active.
279 Returns positive address > 1 if pc is between enter/exit,
280 1 if pc before enter or after exit, 0 otherwise. */
282 ns32k_get_enter_addr (CORE_ADDR pc)
284 CORE_ADDR enter_addr;
290 if (ns32k_about_to_return (pc))
291 return 1; /* after exit */
293 enter_addr = get_pc_function_start (pc);
295 if (pc == enter_addr)
296 return 1; /* before enter */
298 op = read_memory_integer (enter_addr, 1);
301 return 0; /* function has no enter/exit */
303 return enter_addr; /* pc is between enter and exit */
307 ns32k_frame_chain (struct frame_info *frame)
309 /* In the case of the NS32000 series, the frame's nominal address is the
310 FP value, and that address is saved at the previous FP value as a
312 return (read_memory_integer (get_frame_base (frame), 4));
317 ns32k_sigtramp_saved_pc (struct frame_info *frame)
319 CORE_ADDR sigcontext_addr;
321 int ptrbytes = TYPE_LENGTH (builtin_type_void_func_ptr);
322 int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT;
324 buf = alloca (ptrbytes);
325 /* Get sigcontext address, it is the third parameter on the stack. */
326 if (get_next_frame (frame))
327 sigcontext_addr = read_memory_typed_address
328 (DEPRECATED_FRAME_ARGS_ADDRESS (get_next_frame (frame)) + FRAME_ARGS_SKIP + sigcontext_offs,
329 builtin_type_void_data_ptr);
331 sigcontext_addr = read_memory_typed_address
332 (read_register (SP_REGNUM) + sigcontext_offs, builtin_type_void_data_ptr);
334 /* Offset to saved PC in sigcontext, from <machine/signal.h>. Don't
335 cause a memory_error when accessing sigcontext in case the stack
336 layout has changed or the stack is corrupt. */
337 target_read_memory (sigcontext_addr + 20, buf, ptrbytes);
338 return extract_typed_address (buf, builtin_type_void_func_ptr);
342 ns32k_frame_saved_pc (struct frame_info *frame)
344 if ((get_frame_type (frame) == SIGTRAMP_FRAME))
345 return (ns32k_sigtramp_saved_pc (frame)); /* XXXJRT */
347 return (read_memory_integer (get_frame_base (frame) + 4, 4));
351 ns32k_frame_args_address (struct frame_info *frame)
353 if (ns32k_get_enter_addr (get_frame_pc (frame)) > 1)
354 return (get_frame_base (frame));
356 return (read_register (SP_REGNUM) - 4);
359 /* Code to initialize the addresses of the saved registers of frame described
360 by FRAME_INFO. This includes special registers such as pc and fp saved in
361 special ways in the stack frame. sp is even more special: the address we
362 return for it IS the sp for the next frame. */
365 ns32k_frame_init_saved_regs (struct frame_info *frame)
369 CORE_ADDR enter_addr, next_addr;
371 if (deprecated_get_frame_saved_regs (frame))
374 frame_saved_regs_zalloc (frame);
376 enter_addr = ns32k_get_enter_addr (get_frame_pc (frame));
379 regmask = read_memory_integer (enter_addr + 1, 1) & 0xff;
380 localcount = ns32k_localcount (enter_addr);
381 next_addr = get_frame_base (frame) + localcount;
383 for (regnum = 0; regnum < 8; regnum++)
385 if (regmask & (1 << regnum))
386 deprecated_get_frame_saved_regs (frame)[regnum] = next_addr -= 4;
389 deprecated_get_frame_saved_regs (frame)[SP_REGNUM] = get_frame_base (frame) + 4;
390 deprecated_get_frame_saved_regs (frame)[PC_REGNUM] = get_frame_base (frame) + 4;
391 deprecated_get_frame_saved_regs (frame)[DEPRECATED_FP_REGNUM] = read_memory_integer (get_frame_base (frame), 4);
393 else if (enter_addr == 1)
395 CORE_ADDR sp = read_register (SP_REGNUM);
396 deprecated_get_frame_saved_regs (frame)[PC_REGNUM] = sp;
397 deprecated_get_frame_saved_regs (frame)[SP_REGNUM] = sp + 4;
402 ns32k_push_dummy_frame (void)
404 CORE_ADDR sp = read_register (SP_REGNUM);
407 sp = push_word (sp, read_register (PC_REGNUM));
408 sp = push_word (sp, read_register (DEPRECATED_FP_REGNUM));
409 write_register (DEPRECATED_FP_REGNUM, sp);
411 for (regnum = 0; regnum < 8; regnum++)
412 sp = push_word (sp, read_register (regnum));
414 write_register (SP_REGNUM, sp);
418 ns32k_pop_frame (void)
420 struct frame_info *frame = get_current_frame ();
424 fp = get_frame_base (frame);
425 DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
427 for (regnum = 0; regnum < 8; regnum++)
428 if (deprecated_get_frame_saved_regs (frame)[regnum])
429 write_register (regnum,
430 read_memory_integer (deprecated_get_frame_saved_regs (frame)[regnum], 4));
432 write_register (DEPRECATED_FP_REGNUM, read_memory_integer (fp, 4));
433 write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
434 write_register (SP_REGNUM, fp + 8);
435 flush_cached_frames ();
438 /* The NS32000 call dummy sequence:
440 enter 0xff,0 82 ff 00
441 jsr @0x00010203 7f ae c0 01 02 03
442 adjspd 0x69696969 7f a5 01 02 03 04
445 It is 16 bytes long. */
447 static LONGEST ns32k_call_dummy_words[] =
454 static int sizeof_ns32k_call_dummy_words = sizeof (ns32k_call_dummy_words);
456 #define NS32K_CALL_DUMMY_ADDR 5
457 #define NS32K_CALL_DUMMY_NARGS 11
460 ns32k_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
461 struct value **args, struct type *type, int gcc_p)
465 flipped = fun | 0xc0000000;
466 flip_bytes (&flipped, 4);
467 store_unsigned_integer (dummy + NS32K_CALL_DUMMY_ADDR, 4, flipped);
469 flipped = - nargs * 4;
470 flip_bytes (&flipped, 4);
471 store_unsigned_integer (dummy + NS32K_CALL_DUMMY_NARGS, 4, flipped);
475 ns32k_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
477 /* On this machine, this is a no-op (Encore Umax didn't use GCC). */
481 ns32k_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
484 regbuf + DEPRECATED_REGISTER_BYTE (TYPE_CODE (valtype) == TYPE_CODE_FLT ?
485 FP0_REGNUM : 0), TYPE_LENGTH (valtype));
489 ns32k_store_return_value (struct type *valtype, char *valbuf)
491 deprecated_write_register_bytes (TYPE_CODE (valtype) == TYPE_CODE_FLT
492 ? FP0_REGNUM : 0, valbuf,
493 TYPE_LENGTH (valtype));
497 ns32k_gdbarch_init_32082 (struct gdbarch *gdbarch)
499 set_gdbarch_num_regs (gdbarch, NS32K_NUM_REGS_32082);
501 set_gdbarch_register_name (gdbarch, ns32k_register_name_32082);
502 set_gdbarch_deprecated_register_bytes (gdbarch, NS32K_REGISTER_BYTES_32082);
503 set_gdbarch_deprecated_register_byte (gdbarch, ns32k_register_byte_32082);
507 ns32k_gdbarch_init_32382 (struct gdbarch *gdbarch)
509 set_gdbarch_num_regs (gdbarch, NS32K_NUM_REGS_32382);
511 set_gdbarch_register_name (gdbarch, ns32k_register_name_32382);
512 set_gdbarch_deprecated_register_bytes (gdbarch, NS32K_REGISTER_BYTES_32382);
513 set_gdbarch_deprecated_register_byte (gdbarch, ns32k_register_byte_32382);
516 /* Initialize the current architecture based on INFO. If possible, re-use an
517 architecture from ARCHES, which is a list of architectures already created
518 during this debugging session.
520 Called e.g. at program startup, when reading a core file, and when reading
523 static struct gdbarch *
524 ns32k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
526 struct gdbarch *gdbarch;
528 /* If there is already a candidate, use it. */
529 arches = gdbarch_list_lookup_by_info (arches, &info);
531 return arches->gdbarch;
533 gdbarch = gdbarch_alloc (&info, NULL);
535 /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
536 ready to unwind the PC first (see frame.c:get_prev_frame()). */
537 set_gdbarch_deprecated_init_frame_pc (gdbarch, deprecated_init_frame_pc_default);
540 ns32k_gdbarch_init_32082 (gdbarch);
541 set_gdbarch_num_regs (gdbarch, NS32K_SP_REGNUM);
542 set_gdbarch_num_regs (gdbarch, NS32K_FP_REGNUM);
543 set_gdbarch_num_regs (gdbarch, NS32K_PC_REGNUM);
544 set_gdbarch_num_regs (gdbarch, NS32K_PS_REGNUM);
546 set_gdbarch_deprecated_register_size (gdbarch, NS32K_REGISTER_SIZE);
547 set_gdbarch_deprecated_register_raw_size (gdbarch, ns32k_register_raw_size);
548 set_gdbarch_deprecated_max_register_raw_size (gdbarch, NS32K_MAX_REGISTER_RAW_SIZE);
549 set_gdbarch_deprecated_register_virtual_size (gdbarch, ns32k_register_virtual_size);
550 set_gdbarch_deprecated_max_register_virtual_size (gdbarch,
551 NS32K_MAX_REGISTER_VIRTUAL_SIZE);
552 set_gdbarch_deprecated_register_virtual_type (gdbarch, ns32k_register_virtual_type);
554 /* Frame and stack info */
555 set_gdbarch_skip_prologue (gdbarch, umax_skip_prologue);
556 set_gdbarch_deprecated_saved_pc_after_call (gdbarch, ns32k_saved_pc_after_call);
558 set_gdbarch_frame_num_args (gdbarch, umax_frame_num_args);
560 set_gdbarch_deprecated_frame_chain (gdbarch, ns32k_frame_chain);
561 set_gdbarch_deprecated_frame_saved_pc (gdbarch, ns32k_frame_saved_pc);
563 set_gdbarch_deprecated_frame_args_address (gdbarch, ns32k_frame_args_address);
565 set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, ns32k_frame_init_saved_regs);
567 set_gdbarch_frame_args_skip (gdbarch, 8);
569 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
571 /* Return value info */
572 set_gdbarch_deprecated_store_struct_return (gdbarch, ns32k_store_struct_return);
573 set_gdbarch_deprecated_extract_return_value (gdbarch, ns32k_extract_return_value);
574 set_gdbarch_deprecated_store_return_value (gdbarch, ns32k_store_return_value);
576 /* Call dummy info */
577 set_gdbarch_deprecated_push_dummy_frame (gdbarch, ns32k_push_dummy_frame);
578 set_gdbarch_deprecated_pop_frame (gdbarch, ns32k_pop_frame);
579 set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
580 set_gdbarch_deprecated_call_dummy_words (gdbarch, ns32k_call_dummy_words);
581 set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof_ns32k_call_dummy_words);
582 set_gdbarch_deprecated_fix_call_dummy (gdbarch, ns32k_fix_call_dummy);
584 /* Breakpoint info */
585 set_gdbarch_breakpoint_from_pc (gdbarch, ns32k_breakpoint_from_pc);
587 /* Should be using push_dummy_call. */
588 set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
590 set_gdbarch_print_insn (gdbarch, print_insn_ns32k);
592 /* Hook in OS ABI-specific overrides, if they have been registered. */
593 gdbarch_init_osabi (info, gdbarch);
598 extern initialize_file_ftype _initialize_ns32k_tdep; /* -Wmissing-prototypes */
601 _initialize_ns32k_tdep (void)
603 gdbarch_register (bfd_arch_ns32k, ns32k_gdbarch_init, NULL);