1 /* Print VAX instructions for GDB, the GNU debugger.
2 Copyright 1986, 1989, 1991, 1992, 1995, 1996, 1998, 1999, 2000, 2002, 2003
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
24 #include "opcode/vax.h"
30 #include "arch-utils.h"
31 #include "gdb_string.h"
37 static gdbarch_register_name_ftype vax_register_name;
39 static gdbarch_skip_prologue_ftype vax_skip_prologue;
40 static gdbarch_frame_num_args_ftype vax_frame_num_args;
41 static gdbarch_deprecated_frame_chain_ftype vax_frame_chain;
43 static gdbarch_deprecated_extract_return_value_ftype vax_extract_return_value;
44 static gdbarch_deprecated_extract_struct_value_address_ftype
45 vax_extract_struct_value_address;
47 static gdbarch_deprecated_push_dummy_frame_ftype vax_push_dummy_frame;
50 vax_register_name (int regno)
52 static char *register_names[] =
54 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
55 "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc",
61 if (regno >= (sizeof(register_names) / sizeof(*register_names)))
63 return (register_names[regno]);
67 vax_register_byte (int regno)
73 vax_register_raw_size (int regno)
79 vax_register_virtual_size (int regno)
85 vax_register_virtual_type (int regno)
87 return (builtin_type_int);
91 vax_frame_init_saved_regs (struct frame_info *frame)
96 if (deprecated_get_frame_saved_regs (frame))
99 frame_saved_regs_zalloc (frame);
101 regmask = read_memory_integer (get_frame_base (frame) + 4, 4) >> 16;
103 next_addr = get_frame_base (frame) + 16;
105 /* regmask's low bit is for register 0, which is the first one
106 what would be pushed. */
107 for (regnum = 0; regnum < VAX_AP_REGNUM; regnum++)
109 if (regmask & (1 << regnum))
110 deprecated_get_frame_saved_regs (frame)[regnum] = next_addr += 4;
113 deprecated_get_frame_saved_regs (frame)[SP_REGNUM] = next_addr + 4;
114 if (regmask & (1 << DEPRECATED_FP_REGNUM))
115 deprecated_get_frame_saved_regs (frame)[SP_REGNUM] +=
116 4 + (4 * read_memory_integer (next_addr + 4, 4));
118 deprecated_get_frame_saved_regs (frame)[PC_REGNUM] = get_frame_base (frame) + 16;
119 deprecated_get_frame_saved_regs (frame)[DEPRECATED_FP_REGNUM] = get_frame_base (frame) + 12;
120 deprecated_get_frame_saved_regs (frame)[VAX_AP_REGNUM] = get_frame_base (frame) + 8;
121 deprecated_get_frame_saved_regs (frame)[PS_REGNUM] = get_frame_base (frame) + 4;
124 /* Get saved user PC for sigtramp from sigcontext for BSD style sigtramp. */
127 vax_sigtramp_saved_pc (struct frame_info *frame)
129 CORE_ADDR sigcontext_addr;
131 int ptrbytes = TYPE_LENGTH (builtin_type_void_func_ptr);
132 int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT;
134 buf = alloca (ptrbytes);
135 /* Get sigcontext address, it is the third parameter on the stack. */
136 if (get_next_frame (frame))
137 sigcontext_addr = read_memory_typed_address
138 (DEPRECATED_FRAME_ARGS_ADDRESS (get_next_frame (frame))
139 + FRAME_ARGS_SKIP + sigcontext_offs,
140 builtin_type_void_data_ptr);
142 sigcontext_addr = read_memory_typed_address
143 (read_register (SP_REGNUM) + sigcontext_offs, builtin_type_void_data_ptr);
145 /* Don't cause a memory_error when accessing sigcontext in case the stack
146 layout has changed or the stack is corrupt. */
147 target_read_memory (sigcontext_addr + SIGCONTEXT_PC_OFFSET, buf, ptrbytes);
148 return extract_typed_address (buf, builtin_type_void_func_ptr);
152 vax_frame_saved_pc (struct frame_info *frame)
154 if ((get_frame_type (frame) == SIGTRAMP_FRAME))
155 return (vax_sigtramp_saved_pc (frame)); /* XXXJRT */
157 return (read_memory_integer (get_frame_base (frame) + 16, 4));
161 vax_frame_args_address (struct frame_info *frame)
163 /* In most of GDB, getting the args address is too important to just
164 say "I don't know". This is sometimes wrong for functions that
165 aren't on top of the stack, but c'est la vie. */
166 if (get_next_frame (frame))
167 return (read_memory_integer (get_frame_base (get_next_frame (frame)) + 8, 4));
168 /* Cannot find the AP register value directly from the FP value.
169 Must find it saved in the frame called by this one, or in the AP
170 register for the innermost frame. However, there is no way to
171 tell the difference between the innermost frame and a frame for
172 which we just don't know the frame that it called (e.g. "info
173 frame 0x7ffec789"). For the sake of argument, suppose that the
174 stack is somewhat trashed (which is one reason that "info frame"
175 exists). So, return 0 (indicating we don't know the address of
176 the arglist) if we don't know what frame this frame calls. */
181 vax_frame_num_args (struct frame_info *fi)
183 return (0xff & read_memory_integer (DEPRECATED_FRAME_ARGS_ADDRESS (fi), 1));
187 vax_frame_chain (struct frame_info *frame)
189 /* In the case of the VAX, the frame's nominal address is the FP value,
190 and 12 bytes later comes the saved previous FP value as a 4-byte word. */
191 if (deprecated_inside_entry_file (get_frame_pc (frame)))
194 return (read_memory_integer (get_frame_base (frame) + 12, 4));
198 vax_push_dummy_frame (void)
200 CORE_ADDR sp = read_register (SP_REGNUM);
203 sp = push_word (sp, 0); /* arglist */
204 for (regnum = 11; regnum >= 0; regnum--)
205 sp = push_word (sp, read_register (regnum));
206 sp = push_word (sp, read_register (PC_REGNUM));
207 sp = push_word (sp, read_register (DEPRECATED_FP_REGNUM));
208 sp = push_word (sp, read_register (VAX_AP_REGNUM));
209 sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef) + 0x2fff0000);
210 sp = push_word (sp, 0);
211 write_register (SP_REGNUM, sp);
212 write_register (DEPRECATED_FP_REGNUM, sp);
213 write_register (VAX_AP_REGNUM, sp + (17 * 4));
219 CORE_ADDR fp = read_register (DEPRECATED_FP_REGNUM);
221 int regmask = read_memory_integer (fp + 4, 4);
223 write_register (PS_REGNUM,
225 | (read_register (PS_REGNUM) & 0xffff0000));
226 write_register (PC_REGNUM, read_memory_integer (fp + 16, 4));
227 write_register (DEPRECATED_FP_REGNUM, read_memory_integer (fp + 12, 4));
228 write_register (VAX_AP_REGNUM, read_memory_integer (fp + 8, 4));
230 for (regnum = 0; regnum < 12; regnum++)
231 if (regmask & (0x10000 << regnum))
232 write_register (regnum, read_memory_integer (fp += 4, 4));
233 fp = fp + 4 + ((regmask >> 30) & 3);
234 if (regmask & 0x20000000)
236 regnum = read_memory_integer (fp, 4);
237 fp += (regnum + 1) * 4;
239 write_register (SP_REGNUM, fp);
240 flush_cached_frames ();
243 /* The VAX call dummy sequence:
245 calls #69, @#32323232
248 It is 8 bytes long. The address and argc are patched by
249 vax_fix_call_dummy(). */
250 static LONGEST vax_call_dummy_words[] = { 0x329f69fb, 0x03323232 };
251 static int sizeof_vax_call_dummy_words = sizeof(vax_call_dummy_words);
254 vax_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
255 struct value **args, struct type *type, int gcc_p)
258 store_unsigned_integer (dummy + 3, 4, fun);
262 vax_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
264 write_register (1, addr);
268 vax_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
270 memcpy (valbuf, regbuf + DEPRECATED_REGISTER_BYTE (0), TYPE_LENGTH (valtype));
274 vax_store_return_value (struct type *valtype, char *valbuf)
276 deprecated_write_register_bytes (0, valbuf, TYPE_LENGTH (valtype));
280 vax_extract_struct_value_address (char *regbuf)
282 return (extract_unsigned_integer (regbuf + DEPRECATED_REGISTER_BYTE (0),
283 REGISTER_RAW_SIZE (0)));
286 static const unsigned char *
287 vax_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
289 static const unsigned char vax_breakpoint[] = { 3 };
291 *lenptr = sizeof(vax_breakpoint);
292 return (vax_breakpoint);
295 /* Advance PC across any function entry prologue instructions
296 to reach some "real" code. */
299 vax_skip_prologue (CORE_ADDR pc)
301 int op = (unsigned char) read_memory_integer (pc, 1);
303 pc += 2; /* skip brb */
305 pc += 3; /* skip brw */
307 && ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E)
308 pc += 3; /* skip subl2 */
310 && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xAE
311 && ((unsigned char) read_memory_integer (pc + 3, 1)) == 0x5E)
312 pc += 4; /* skip movab */
314 && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xCE
315 && ((unsigned char) read_memory_integer (pc + 4, 1)) == 0x5E)
316 pc += 5; /* skip movab */
318 && ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xEE
319 && ((unsigned char) read_memory_integer (pc + 6, 1)) == 0x5E)
320 pc += 7; /* skip movab */
325 vax_saved_pc_after_call (struct frame_info *frame)
327 return (DEPRECATED_FRAME_SAVED_PC(frame));
330 /* Initialize the current architecture based on INFO. If possible, re-use an
331 architecture from ARCHES, which is a list of architectures already created
332 during this debugging session.
334 Called e.g. at program startup, when reading a core file, and when reading
337 static struct gdbarch *
338 vax_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
340 struct gdbarch *gdbarch;
342 /* If there is already a candidate, use it. */
343 arches = gdbarch_list_lookup_by_info (arches, &info);
345 return arches->gdbarch;
347 gdbarch = gdbarch_alloc (&info, NULL);
349 /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
350 ready to unwind the PC first (see frame.c:get_prev_frame()). */
351 set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
354 set_gdbarch_num_regs (gdbarch, VAX_NUM_REGS);
355 set_gdbarch_sp_regnum (gdbarch, VAX_SP_REGNUM);
356 set_gdbarch_deprecated_fp_regnum (gdbarch, VAX_FP_REGNUM);
357 set_gdbarch_pc_regnum (gdbarch, VAX_PC_REGNUM);
358 set_gdbarch_ps_regnum (gdbarch, VAX_PS_REGNUM);
360 set_gdbarch_register_name (gdbarch, vax_register_name);
361 set_gdbarch_deprecated_register_size (gdbarch, VAX_REGISTER_SIZE);
362 set_gdbarch_deprecated_register_bytes (gdbarch, VAX_REGISTER_BYTES);
363 set_gdbarch_deprecated_register_byte (gdbarch, vax_register_byte);
364 set_gdbarch_deprecated_register_raw_size (gdbarch, vax_register_raw_size);
365 set_gdbarch_deprecated_max_register_raw_size (gdbarch, VAX_MAX_REGISTER_RAW_SIZE);
366 set_gdbarch_deprecated_register_virtual_size (gdbarch, vax_register_virtual_size);
367 set_gdbarch_deprecated_max_register_virtual_size (gdbarch,
368 VAX_MAX_REGISTER_VIRTUAL_SIZE);
369 set_gdbarch_deprecated_register_virtual_type (gdbarch, vax_register_virtual_type);
371 /* Frame and stack info */
372 set_gdbarch_skip_prologue (gdbarch, vax_skip_prologue);
373 set_gdbarch_deprecated_saved_pc_after_call (gdbarch, vax_saved_pc_after_call);
375 set_gdbarch_frame_num_args (gdbarch, vax_frame_num_args);
376 set_gdbarch_frameless_function_invocation (gdbarch,
377 generic_frameless_function_invocation_not);
379 set_gdbarch_deprecated_frame_chain (gdbarch, vax_frame_chain);
380 set_gdbarch_deprecated_frame_saved_pc (gdbarch, vax_frame_saved_pc);
382 set_gdbarch_deprecated_frame_args_address (gdbarch, vax_frame_args_address);
384 set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, vax_frame_init_saved_regs);
386 set_gdbarch_frame_args_skip (gdbarch, 4);
388 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
390 /* Return value info */
391 set_gdbarch_deprecated_store_struct_return (gdbarch, vax_store_struct_return);
392 set_gdbarch_deprecated_extract_return_value (gdbarch, vax_extract_return_value);
393 set_gdbarch_deprecated_store_return_value (gdbarch, vax_store_return_value);
394 set_gdbarch_deprecated_extract_struct_value_address (gdbarch, vax_extract_struct_value_address);
396 /* Call dummy info */
397 set_gdbarch_deprecated_push_dummy_frame (gdbarch, vax_push_dummy_frame);
398 set_gdbarch_deprecated_pop_frame (gdbarch, vax_pop_frame);
399 set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
400 set_gdbarch_deprecated_call_dummy_words (gdbarch, vax_call_dummy_words);
401 set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof_vax_call_dummy_words);
402 set_gdbarch_deprecated_fix_call_dummy (gdbarch, vax_fix_call_dummy);
403 set_gdbarch_deprecated_call_dummy_breakpoint_offset (gdbarch, 7);
404 set_gdbarch_deprecated_use_generic_dummy_frames (gdbarch, 0);
405 set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_on_stack);
407 /* Breakpoint info */
408 set_gdbarch_breakpoint_from_pc (gdbarch, vax_breakpoint_from_pc);
409 set_gdbarch_decr_pc_after_break (gdbarch, 0);
412 set_gdbarch_function_start_offset (gdbarch, 2);
413 set_gdbarch_believe_pcc_promotion (gdbarch, 1);
415 /* Should be using push_dummy_call. */
416 set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
418 /* Hook in ABI-specific overrides, if they have been registered. */
419 gdbarch_init_osabi (info, gdbarch);
421 set_gdbarch_print_insn (gdbarch, print_insn_vax);
426 extern initialize_file_ftype _initialize_vax_tdep; /* -Wmissing-prototypes */
429 _initialize_vax_tdep (void)
431 gdbarch_register (bfd_arch_vax, vax_gdbarch_init, NULL);