gdb/tui/tuiDisassem.c

   1 /* Disassembly display.
   2
   3    Copyright 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation,
   4    Inc.
   5
   6    Contributed by Hewlett-Packard Company.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330,
  23    Boston, MA 02111-1307, USA.  */
  24
  25 #include "defs.h"
  26 #include "symtab.h"
  27 #include "breakpoint.h"
  28 #include "frame.h"
  29 #include "value.h"
  30 #include "source.h"
  31 #include "disasm.h"
  32
  33 #include "tui.h"
  34 #include "tuiData.h"
  35 #include "tuiWin.h"
  36 #include "tuiLayout.h"
  37 #include "tuiSourceWin.h"
  38 #include "tuiStack.h"
  39 #include "tui-file.h"
  40
  41 #ifdef HAVE_NCURSES_H
  42 #include <ncurses.h>
  43 #else
  44 #ifdef HAVE_CURSES_H
  45 #include <curses.h>
  46 #endif
  47 #endif
  48
  49 struct tui_asm_line
  50 {
  51   CORE_ADDR addr;
  52   char* addr_string;
  53   char* insn;
  54 };
  55
  56 /* Function to set the disassembly window's content.
  57    Disassemble count lines starting at pc.
  58    Return address of the count'th instruction after pc.  */
  59 static CORE_ADDR
  60 tui_disassemble (struct tui_asm_line* lines, CORE_ADDR pc, int count)
  61 {
  62   struct ui_file *gdb_dis_out;
  63
  64   /* now init the ui_file structure */
  65   gdb_dis_out = tui_sfileopen (256);
  66
  67   /* Now construct each line */
  68   for (; count > 0; count--, lines++)
  69     {
  70       if (lines->addr_string)
  71         xfree (lines->addr_string);
  72       if (lines->insn)
  73         xfree (lines->insn);
  74
  75       print_address (pc, gdb_dis_out);
  76       lines->addr = pc;
  77       lines->addr_string = xstrdup (tui_file_get_strbuf (gdb_dis_out));
  78
  79       ui_file_rewind (gdb_dis_out);
  80
  81       pc = pc + gdb_print_insn (pc, gdb_dis_out);
  82
  83       lines->insn = xstrdup (tui_file_get_strbuf (gdb_dis_out));
  84
  85       /* reset the buffer to empty */
  86       ui_file_rewind (gdb_dis_out);
  87     }
  88   ui_file_delete (gdb_dis_out);
  89   return pc;
  90 }
  91
  92 /* Find the disassembly address that corresponds to FROM lines
  93    above or below the PC.  Variable sized instructions are taken
  94    into account by the algorithm.  */
  95 static CORE_ADDR
  96 tui_find_disassembly_address (CORE_ADDR pc, int from)
  97 {
  98   register CORE_ADDR newLow;
  99   int maxLines;
 100   int i;
 101   struct tui_asm_line* lines;
 102
 103   maxLines = (from > 0) ? from : - from;
 104   if (maxLines <= 1)
 105      return pc;
 106
 107   lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)
 108                                          * maxLines);
 109   memset (lines, 0, sizeof (struct tui_asm_line) * maxLines);
 110
 111   newLow = pc;
 112   if (from > 0)
 113     {
 114       tui_disassemble (lines, pc, maxLines);
 115       newLow = lines[maxLines - 1].addr;
 116     }
 117   else
 118     {
 119       CORE_ADDR last_addr;
 120       int pos;
 121       struct minimal_symbol* msymbol;
 122
 123       /* Find backward an address which is a symbol
 124          and for which disassembling from that address will fill
 125          completely the window.  */
 126       pos = maxLines - 1;
 127       do {
 128          newLow -= 1 * maxLines;
 129          msymbol = lookup_minimal_symbol_by_pc_section (newLow, 0);
 130
 131          if (msymbol)
 132             newLow = SYMBOL_VALUE_ADDRESS (msymbol);
 133          else
 134             newLow += 1 * maxLines;
 135
 136          tui_disassemble (lines, newLow, maxLines);
 137          last_addr = lines[pos].addr;
 138       } while (last_addr > pc && msymbol);
 139
 140       /* Scan forward disassembling one instruction at a time
 141          until the last visible instruction of the window
 142          matches the pc.  We keep the disassembled instructions
 143          in the 'lines' window and shift it downward (increasing
 144          its addresses).  */
 145       if (last_addr < pc)
 146         do
 147           {
 148             CORE_ADDR next_addr;
 149
 150             pos++;
 151             if (pos >= maxLines)
 152               pos = 0;
 153
 154             next_addr = tui_disassemble (&lines[pos], last_addr, 1);
 155
 156             /* If there are some problems while disassembling exit.  */
 157             if (next_addr <= last_addr)
 158               break;
 159             last_addr = next_addr;
 160           } while (last_addr <= pc);
 161       pos++;
 162       if (pos >= maxLines)
 163          pos = 0;
 164       newLow = lines[pos].addr;
 165     }
 166   for (i = 0; i < maxLines; i++)
 167     {
 168       xfree (lines[i].addr_string);
 169       xfree (lines[i].insn);
 170     }
 171   return newLow;
 172 }
 173
 174 /* Function to set the disassembly window's content.  */
 175 TuiStatus
 176 tuiSetDisassemContent (CORE_ADDR pc)
 177 {
 178   TuiStatus ret = TUI_FAILURE;
 179   register int i;
 180   register int offset = disassemWin->detail.sourceInfo.horizontalOffset;
 181   register int lineWidth, maxLines;
 182   CORE_ADDR cur_pc;
 183   TuiGenWinInfoPtr locator = locatorWinInfoPtr ();
 184   int tab_len = tuiDefaultTabLen ();
 185   struct tui_asm_line* lines;
 186   int insn_pos;
 187   int addr_size, max_size;
 188   char* line;
 189
 190   if (pc == 0)
 191     return TUI_FAILURE;
 192
 193   ret = tuiAllocSourceBuffer (disassemWin);
 194   if (ret != TUI_SUCCESS)
 195     return ret;
 196
 197   disassemWin->detail.sourceInfo.startLineOrAddr.addr = pc;
 198   cur_pc = (CORE_ADDR)
 199     (((TuiWinElementPtr) locator->content[0])->whichElement.locator.addr);
 200
 201   maxLines = disassemWin->generic.height - 2;   /* account for hilite */
 202
 203   /* Get temporary table that will hold all strings (addr & insn).  */
 204   lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)
 205                                          * maxLines);
 206   memset (lines, 0, sizeof (struct tui_asm_line) * maxLines);
 207
 208   lineWidth = disassemWin->generic.width - 1;
 209
 210   tui_disassemble (lines, pc, maxLines);
 211
 212   /* See what is the maximum length of an address and of a line.  */
 213   addr_size = 0;
 214   max_size = 0;
 215   for (i = 0; i < maxLines; i++)
 216     {
 217       size_t len = strlen (lines[i].addr_string);
 218       if (len > addr_size)
 219         addr_size = len;
 220
 221       len = strlen (lines[i].insn) + tab_len;
 222       if (len > max_size)
 223         max_size = len;
 224     }
 225   max_size += addr_size + tab_len;
 226
 227   /* Allocate memory to create each line.  */
 228   line = (char*) alloca (max_size);
 229   insn_pos = (1 + (addr_size / tab_len)) * tab_len;
 230
 231   /* Now construct each line */
 232   for (i = 0; i < maxLines; i++)
 233     {
 234       TuiWinElementPtr element;
 235       TuiSourceElement* src;
 236       int curLen;
 237
 238       element = (TuiWinElementPtr) disassemWin->generic.content[i];
 239       src = &element->whichElement.source;
 240       strcpy (line, lines[i].addr_string);
 241       curLen = strlen (line);
 242
 243       /* Add spaces to make the instructions start on the same column */
 244       while (curLen < insn_pos)
 245         {
 246           strcat (line, " ");
 247           curLen++;
 248         }
 249
 250       strcat (line, lines[i].insn);
 251
 252       /* Now copy the line taking the offset into account */
 253       if (strlen (line) > offset)
 254         strcpy (src->line, &line[offset]);
 255       else
 256         src->line[0] = '\0';
 257
 258       src->lineOrAddr.addr = lines[i].addr;
 259       src->isExecPoint = lines[i].addr == cur_pc;
 260
 261       /* See whether there is a breakpoint installed.  */
 262       src->hasBreak = (!src->isExecPoint
 263                        && breakpoint_here_p (pc) != no_breakpoint_here);
 264
 265       xfree (lines[i].addr_string);
 266       xfree (lines[i].insn);
 267     }
 268   disassemWin->generic.contentSize = i;
 269   return TUI_SUCCESS;
 270 }
 271
 272
 273 /*
 274    ** tuiShowDisassem().
 275    **        Function to display the disassembly window with disassembled code.
 276  */
 277 void
 278 tuiShowDisassem (CORE_ADDR startAddr)
 279 {
 280   struct symtab *s = find_pc_symtab (startAddr);
 281   TuiWinInfoPtr winWithFocus = tuiWinWithFocus ();
 282   TuiLineOrAddress val;
 283
 284   val.addr = startAddr;
 285   tuiAddWinToLayout (DISASSEM_WIN);
 286   tuiUpdateSourceWindow (disassemWin, s, val, FALSE);
 287   /*
 288      ** if the focus was in the src win, put it in the asm win, if the
 289      ** source view isn't split
 290    */
 291   if (currentLayout () != SRC_DISASSEM_COMMAND && winWithFocus == srcWin)
 292     tuiSetWinFocusTo (disassemWin);
 293
 294   return;
 295 }                               /* tuiShowDisassem */
 296
 297
 298 /*
 299    ** tuiShowDisassemAndUpdateSource().
 300    **        Function to display the disassembly window.
 301  */
 302 void
 303 tuiShowDisassemAndUpdateSource (CORE_ADDR startAddr)
 304 {
 305   struct symtab_and_line sal;
 306
 307   tuiShowDisassem (startAddr);
 308   if (currentLayout () == SRC_DISASSEM_COMMAND)
 309     {
 310       TuiLineOrAddress val;
 311
 312       /*
 313          ** Update what is in the source window if it is displayed too,
 314          ** note that it follows what is in the disassembly window and visa-versa
 315        */
 316       sal = find_pc_line (startAddr, 0);
 317       val.lineNo = sal.line;
 318       tuiUpdateSourceWindow (srcWin, sal.symtab, val, TRUE);
 319       if (sal.symtab)
 320         {
 321           set_current_source_symtab_and_line (&sal);
 322           tuiUpdateLocatorFilename (sal.symtab->filename);
 323         }
 324       else
 325         tuiUpdateLocatorFilename ("?");
 326     }
 327
 328   return;
 329 }                               /* tuiShowDisassemAndUpdateSource */
 330
 331 /*
 332    ** tuiGetBeginAsmAddress().
 333  */
 334 CORE_ADDR
 335 tuiGetBeginAsmAddress (void)
 336 {
 337   TuiGenWinInfoPtr locator;
 338   TuiLocatorElementPtr element;
 339   CORE_ADDR addr;
 340
 341   locator = locatorWinInfoPtr ();
 342   element = &((TuiWinElementPtr) locator->content[0])->whichElement.locator;
 343
 344   if (element->addr == 0)
 345     {
 346       struct minimal_symbol *main_symbol;
 347
 348       /* Find address of the start of program.
 349          Note: this should be language specific.  */
 350       main_symbol = lookup_minimal_symbol ("main", NULL, NULL);
 351       if (main_symbol == 0)
 352         main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL);
 353       if (main_symbol == 0)
 354         main_symbol = lookup_minimal_symbol ("_start", NULL, NULL);
 355       if (main_symbol)
 356         addr = SYMBOL_VALUE_ADDRESS (main_symbol);
 357       else
 358         addr = 0;
 359     }
 360   else                          /* the target is executing */
 361     addr = element->addr;
 362
 363   return addr;
 364 }                               /* tuiGetBeginAsmAddress */
 365
 366 /* Determine what the low address will be to display in the TUI's
 367    disassembly window.  This may or may not be the same as the
 368    low address input.  */
 369 CORE_ADDR
 370 tuiGetLowDisassemblyAddress (CORE_ADDR low, CORE_ADDR pc)
 371 {
 372   int pos;
 373
 374   /* Determine where to start the disassembly so that the pc is about in the
 375      middle of the viewport.  */
 376   pos = tuiDefaultWinViewportHeight (DISASSEM_WIN, DISASSEM_COMMAND) / 2;
 377   pc = tui_find_disassembly_address (pc, -pos);
 378
 379   if (pc < low)
 380     pc = low;
 381   return pc;
 382 }
 383
 384 /*
 385    ** tuiVerticalDisassemScroll().
 386    **      Scroll the disassembly forward or backward vertically
 387  */
 388 void
 389 tuiVerticalDisassemScroll (TuiScrollDirection scrollDirection,
 390                            int numToScroll)
 391 {
 392   if (disassemWin->generic.content != (OpaquePtr) NULL)
 393     {
 394       CORE_ADDR pc;
 395       TuiWinContent content;
 396       struct symtab *s;
 397       TuiLineOrAddress val;
 398       int maxLines, dir;
 399       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 400
 401       content = (TuiWinContent) disassemWin->generic.content;
 402       if (cursal.symtab == (struct symtab *) NULL)
 403         s = find_pc_symtab (get_frame_pc (deprecated_selected_frame));
 404       else
 405         s = cursal.symtab;
 406
 407       /* account for hilite */
 408       maxLines = disassemWin->generic.height - 2;
 409       pc = content[0]->whichElement.source.lineOrAddr.addr;
 410       dir = (scrollDirection == FORWARD_SCROLL) ? maxLines : - maxLines;
 411
 412       val.addr = tui_find_disassembly_address (pc, dir);
 413       tuiUpdateSourceWindowAsIs (disassemWin, s, val, FALSE);
 414     }
 415 }