gdb/disasm.c

   1 /* Disassemble support for GDB.
   2
   3    Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   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.
  11
  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.
  16
  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.  */
  21
  22 #include "defs.h"
  23 #include "target.h"
  24 #include "value.h"
  25 #include "ui-out.h"
  26 #include "gdb_string.h"
  27 #include "disasm.h"
  28 #include "gdbcore.h"
  29
  30 /* Disassemble functions.
  31    FIXME: We should get rid of all the duplicate code in gdb that does
  32    the same thing: disassemble_command() and the gdbtk variation. */
  33
  34 /* This Structure is used to store line number information.
  35    We need a different sort of line table from the normal one cuz we can't
  36    depend upon implicit line-end pc's for lines to do the
  37    reordering in this function.  */
  38
  39 struct dis_line_entry
  40 {
  41   int line;
  42   CORE_ADDR start_pc;
  43   CORE_ADDR end_pc;
  44 };
  45
  46 /* Like target_read_memory, but slightly different parameters.  */
  47 static int
  48 dis_asm_read_memory (bfd_vma memaddr, bfd_byte *myaddr, unsigned int len,
  49                      disassemble_info *info)
  50 {
  51   return target_read_memory (memaddr, (char *) myaddr, len);
  52 }
  53
  54 /* Like memory_error with slightly different parameters.  */
  55 static void
  56 dis_asm_memory_error (int status, bfd_vma memaddr, disassemble_info *info)
  57 {
  58   memory_error (status, memaddr);
  59 }
  60
  61 /* Like print_address with slightly different parameters.  */
  62 static void
  63 dis_asm_print_address (bfd_vma addr, struct disassemble_info *info)
  64 {
  65   print_address (addr, info->stream);
  66 }
  67
  68 static int
  69 compare_lines (const void *mle1p, const void *mle2p)
  70 {
  71   struct dis_line_entry *mle1, *mle2;
  72   int val;
  73
  74   mle1 = (struct dis_line_entry *) mle1p;
  75   mle2 = (struct dis_line_entry *) mle2p;
  76
  77   val = mle1->line - mle2->line;
  78
  79   if (val != 0)
  80     return val;
  81
  82   return mle1->start_pc - mle2->start_pc;
  83 }
  84
  85 static int
  86 dump_insns (struct ui_out *uiout, disassemble_info * di,
  87             CORE_ADDR low, CORE_ADDR high,
  88             int how_many, struct ui_stream *stb)
  89 {
  90   int num_displayed = 0;
  91   CORE_ADDR pc;
  92
  93   /* parts of the symbolic representation of the address */
  94   int unmapped;
  95   int offset;
  96   int line;
  97   struct cleanup *ui_out_chain;
  98
  99   for (pc = low; pc < high;)
 100     {
 101       char *filename = NULL;
 102       char *name = NULL;
 103
 104       QUIT;
 105       if (how_many >= 0)
 106         {
 107           if (num_displayed >= how_many)
 108             break;
 109           else
 110             num_displayed++;
 111         }
 112       ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 113       ui_out_field_core_addr (uiout, "address", pc);
 114
 115       if (!build_address_symbolic (pc, 0, &name, &offset, &filename,
 116                                    &line, &unmapped))
 117         {
 118           /* We don't care now about line, filename and
 119              unmapped. But we might in the future. */
 120           ui_out_text (uiout, " <");
 121           ui_out_field_string (uiout, "func-name", name);
 122           ui_out_text (uiout, "+");
 123           ui_out_field_int (uiout, "offset", offset);
 124           ui_out_text (uiout, ">:\t");
 125         }
 126       if (filename != NULL)
 127         xfree (filename);
 128       if (name != NULL)
 129         xfree (name);
 130
 131       ui_file_rewind (stb->stream);
 132       pc += TARGET_PRINT_INSN (pc, di);
 133       ui_out_field_stream (uiout, "inst", stb);
 134       ui_file_rewind (stb->stream);
 135       do_cleanups (ui_out_chain);
 136       ui_out_text (uiout, "\n");
 137     }
 138   return num_displayed;
 139 }
 140
 141 /* The idea here is to present a source-O-centric view of a
 142    function to the user.  This means that things are presented
 143    in source order, with (possibly) out of order assembly
 144    immediately following.  */
 145 static void
 146 do_mixed_source_and_assembly (struct ui_out *uiout,
 147                               struct disassemble_info *di, int nlines,
 148                               struct linetable_entry *le,
 149                               CORE_ADDR low, CORE_ADDR high,
 150                               struct symtab *symtab,
 151                               int how_many, struct ui_stream *stb)
 152 {
 153   int newlines = 0;
 154   struct dis_line_entry *mle;
 155   struct symtab_and_line sal;
 156   int i;
 157   int out_of_order = 0;
 158   int next_line = 0;
 159   CORE_ADDR pc;
 160   int num_displayed = 0;
 161   struct cleanup *ui_out_chain;
 162
 163   mle = (struct dis_line_entry *) alloca (nlines
 164                                           * sizeof (struct dis_line_entry));
 165
 166   /* Copy linetable entries for this function into our data
 167      structure, creating end_pc's and setting out_of_order as
 168      appropriate.  */
 169
 170   /* First, skip all the preceding functions.  */
 171
 172   for (i = 0; i < nlines - 1 && le[i].pc < low; i++);
 173
 174   /* Now, copy all entries before the end of this function.  */
 175
 176   for (; i < nlines - 1 && le[i].pc < high; i++)
 177     {
 178       if (le[i].line == le[i + 1].line && le[i].pc == le[i + 1].pc)
 179         continue;               /* Ignore duplicates */
 180
 181       /* Skip any end-of-function markers.  */
 182       if (le[i].line == 0)
 183         continue;
 184
 185       mle[newlines].line = le[i].line;
 186       if (le[i].line > le[i + 1].line)
 187         out_of_order = 1;
 188       mle[newlines].start_pc = le[i].pc;
 189       mle[newlines].end_pc = le[i + 1].pc;
 190       newlines++;
 191     }
 192
 193   /* If we're on the last line, and it's part of the function,
 194      then we need to get the end pc in a special way.  */
 195
 196   if (i == nlines - 1 && le[i].pc < high)
 197     {
 198       mle[newlines].line = le[i].line;
 199       mle[newlines].start_pc = le[i].pc;
 200       sal = find_pc_line (le[i].pc, 0);
 201       mle[newlines].end_pc = sal.end;
 202       newlines++;
 203     }
 204
 205   /* Now, sort mle by line #s (and, then by addresses within
 206      lines). */
 207
 208   if (out_of_order)
 209     qsort (mle, newlines, sizeof (struct dis_line_entry), compare_lines);
 210
 211   /* Now, for each line entry, emit the specified lines (unless
 212      they have been emitted before), followed by the assembly code
 213      for that line.  */
 214
 215   ui_out_chain = make_cleanup_ui_out_list_begin_end (uiout, "asm_insns");
 216
 217   for (i = 0; i < newlines; i++)
 218     {
 219       struct cleanup *ui_out_tuple_chain = NULL;
 220       struct cleanup *ui_out_list_chain = NULL;
 221       int close_list = 1;
 222
 223       /* Print out everything from next_line to the current line.  */
 224       if (mle[i].line >= next_line)
 225         {
 226           if (next_line != 0)
 227             {
 228               /* Just one line to print. */
 229               if (next_line == mle[i].line)
 230                 {
 231                   ui_out_tuple_chain
 232                     = make_cleanup_ui_out_tuple_begin_end (uiout,
 233                                                            "src_and_asm_line");
 234                   print_source_lines (symtab, next_line, mle[i].line + 1, 0);
 235                 }
 236               else
 237                 {
 238                   /* Several source lines w/o asm instructions associated. */
 239                   for (; next_line < mle[i].line; next_line++)
 240                     {
 241                       struct cleanup *ui_out_list_chain_line;
 242                       struct cleanup *ui_out_tuple_chain_line;
 243
 244                       ui_out_tuple_chain_line
 245                         = make_cleanup_ui_out_tuple_begin_end (uiout,
 246                                                                "src_and_asm_line");
 247                       print_source_lines (symtab, next_line, next_line + 1,
 248                                           0);
 249                       ui_out_list_chain_line
 250                         = make_cleanup_ui_out_list_begin_end (uiout,
 251                                                               "line_asm_insn");
 252                       do_cleanups (ui_out_list_chain_line);
 253                       do_cleanups (ui_out_tuple_chain_line);
 254                     }
 255                   /* Print the last line and leave list open for
 256                      asm instructions to be added. */
 257                   ui_out_tuple_chain
 258                     = make_cleanup_ui_out_tuple_begin_end (uiout,
 259                                                            "src_and_asm_line");
 260                   print_source_lines (symtab, next_line, mle[i].line + 1, 0);
 261                 }
 262             }
 263           else
 264             {
 265               ui_out_tuple_chain
 266                 = make_cleanup_ui_out_tuple_begin_end (uiout, "src_and_asm_line");
 267               print_source_lines (symtab, mle[i].line, mle[i].line + 1, 0);
 268             }
 269
 270           next_line = mle[i].line + 1;
 271           ui_out_list_chain
 272             = make_cleanup_ui_out_list_begin_end (uiout, "line_asm_insn");
 273           /* Don't close the list if the lines are not in order. */
 274           if (i < (newlines - 1) && mle[i + 1].line <= mle[i].line)
 275             close_list = 0;
 276         }
 277
 278       num_displayed += dump_insns (uiout, di, mle[i].start_pc, mle[i].end_pc,
 279                                    how_many, stb);
 280       if (close_list)
 281         {
 282           do_cleanups (ui_out_list_chain);
 283           do_cleanups (ui_out_tuple_chain);
 284           ui_out_text (uiout, "\n");
 285           close_list = 0;
 286         }
 287       if (how_many >= 0)
 288         if (num_displayed >= how_many)
 289           break;
 290     }
 291   do_cleanups (ui_out_chain);
 292 }
 293
 294
 295 static void
 296 do_assembly_only (struct ui_out *uiout, disassemble_info * di,
 297                   CORE_ADDR low, CORE_ADDR high,
 298                   int how_many, struct ui_stream *stb)
 299 {
 300   int num_displayed = 0;
 301   struct cleanup *ui_out_chain;
 302
 303   ui_out_chain = make_cleanup_ui_out_list_begin_end (uiout, "asm_insns");
 304
 305   num_displayed = dump_insns (uiout, di, low, high, how_many, stb);
 306
 307   do_cleanups (ui_out_chain);
 308 }
 309
 310 /* Initialize the disassemble info struct ready for the specified
 311    stream.  */
 312
 313 static disassemble_info
 314 gdb_disassemble_info (struct gdbarch *gdbarch, struct ui_file *file)
 315 {
 316   disassemble_info di;
 317   INIT_DISASSEMBLE_INFO_NO_ARCH (di, file,
 318                                  (fprintf_ftype) fprintf_filtered);
 319   di.flavour = bfd_target_unknown_flavour;
 320   di.memory_error_func = dis_asm_memory_error;
 321   di.print_address_func = dis_asm_print_address;
 322   /* NOTE: cagney/2003-04-28: The original code, from the old Insight
 323      disassembler had a local optomization here.  By default it would
 324      access the executable file, instead of the target memory (there
 325      was a growing list of exceptions though).  Unfortunatly, the
 326      heuristic was flawed.  Commands like "disassemble &variable"
 327      didn't work as they relied on the access going to the target.
 328      Further, it has been supperseeded by trust-read-only-sections
 329      (although that should be superseeded by target_trust..._p()).  */
 330   di.read_memory_func = dis_asm_read_memory;
 331   di.mach = gdbarch_bfd_arch_info (gdbarch)->mach;
 332   di.endian = gdbarch_byte_order (gdbarch);
 333   return di;
 334 }
 335
 336 void
 337 gdb_disassembly (struct ui_out *uiout,
 338                 char *file_string,
 339                 int line_num,
 340                 int mixed_source_and_assembly,
 341                 int how_many, CORE_ADDR low, CORE_ADDR high)
 342 {
 343   struct ui_stream *stb = ui_out_stream_new (uiout);
 344   struct cleanup *cleanups = make_cleanup_ui_out_stream_delete (stb);
 345   disassemble_info di = gdb_disassemble_info (current_gdbarch, stb->stream);
 346   /* To collect the instruction outputted from opcodes. */
 347   struct symtab *symtab = NULL;
 348   struct linetable_entry *le = NULL;
 349   int nlines = -1;
 350
 351   /* Assume symtab is valid for whole PC range */
 352   symtab = find_pc_symtab (low);
 353
 354   if (symtab != NULL && symtab->linetable != NULL)
 355     {
 356       /* Convert the linetable to a bunch of my_line_entry's.  */
 357       le = symtab->linetable->item;
 358       nlines = symtab->linetable->nitems;
 359     }
 360
 361   if (!mixed_source_and_assembly || nlines <= 0
 362       || symtab == NULL || symtab->linetable == NULL)
 363     do_assembly_only (uiout, &di, low, high, how_many, stb);
 364
 365   else if (mixed_source_and_assembly)
 366     do_mixed_source_and_assembly (uiout, &di, nlines, le, low,
 367                                   high, symtab, how_many, stb);
 368
 369   do_cleanups (cleanups);
 370   gdb_flush (gdb_stdout);
 371 }
 372
 373 /* Print the instruction at address MEMADDR in debugged memory,
 374    on STREAM.  Returns length of the instruction, in bytes.  */
 375
 376 int
 377 gdb_print_insn (CORE_ADDR memaddr, struct ui_file *stream)
 378 {
 379   disassemble_info di = gdb_disassemble_info (current_gdbarch, stream);
 380   return TARGET_PRINT_INSN (memaddr, &di);
 381 }
 382
 383 \f
 384 /* FIXME: cagney/2003-04-28: This global deprecated_tm_print_insn_info
 385    is going away.  */
 386 disassemble_info deprecated_tm_print_insn_info;
 387
 388 extern void _initialize_disasm (void);
 389
 390 void
 391 _initialize_disasm (void)
 392 {
 393
 394   INIT_DISASSEMBLE_INFO_NO_ARCH (deprecated_tm_print_insn_info, gdb_stdout,
 395                                  (fprintf_ftype)fprintf_filtered);
 396   deprecated_tm_print_insn_info.flavour = bfd_target_unknown_flavour;
 397   deprecated_tm_print_insn_info.read_memory_func = dis_asm_read_memory;
 398   deprecated_tm_print_insn_info.memory_error_func = dis_asm_memory_error;
 399   deprecated_tm_print_insn_info.print_address_func = dis_asm_print_address;
 400 }