1 /* Disassembly display. 2 3 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software 4 Foundation, 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 #include "gdb_string.h" 33 #include "tui/tui.h" 34 #include "tui/tui-data.h" 35 #include "tui/tui-win.h" 36 #include "tui/tui-layout.h" 37 #include "tui/tui-winsource.h" 38 #include "tui/tui-stack.h" 39 #include "tui/tui-file.h" 40 41 #include "gdb_curses.h" 42 43 struct tui_asm_line 44 { 45 CORE_ADDR addr; 46 char* addr_string; 47 char* insn; 48 }; 49 50 /* Function to set the disassembly window's content. 51 Disassemble count lines starting at pc. 52 Return address of the count'th instruction after pc. */ 53 static CORE_ADDR 54 tui_disassemble (struct tui_asm_line* asm_lines, CORE_ADDR pc, int count) 55 { 56 struct ui_file *gdb_dis_out; 57 58 /* now init the ui_file structure */ 59 gdb_dis_out = tui_sfileopen (256); 60 61 /* Now construct each line */ 62 for (; count > 0; count--, asm_lines++) 63 { 64 if (asm_lines->addr_string) 65 xfree (asm_lines->addr_string); 66 if (asm_lines->insn) 67 xfree (asm_lines->insn); 68 69 print_address (pc, gdb_dis_out); 70 asm_lines->addr = pc; 71 asm_lines->addr_string = xstrdup (tui_file_get_strbuf (gdb_dis_out)); 72 73 ui_file_rewind (gdb_dis_out); 74 75 pc = pc + gdb_print_insn (pc, gdb_dis_out); 76 77 asm_lines->insn = xstrdup (tui_file_get_strbuf (gdb_dis_out)); 78 79 /* reset the buffer to empty */ 80 ui_file_rewind (gdb_dis_out); 81 } 82 ui_file_delete (gdb_dis_out); 83 return pc; 84 } 85 86 /* Find the disassembly address that corresponds to FROM lines 87 above or below the PC. Variable sized instructions are taken 88 into account by the algorithm. */ 89 static CORE_ADDR 90 tui_find_disassembly_address (CORE_ADDR pc, int from) 91 { 92 CORE_ADDR new_low; 93 int max_lines; 94 int i; 95 struct tui_asm_line* asm_lines; 96 97 max_lines = (from > 0) ? from : - from; 98 if (max_lines <= 1) 99 return pc; 100 101 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line) 102 * max_lines); 103 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines); 104 105 new_low = pc; 106 if (from > 0) 107 { 108 tui_disassemble (asm_lines, pc, max_lines); 109 new_low = asm_lines[max_lines - 1].addr; 110 } 111 else 112 { 113 CORE_ADDR last_addr; 114 int pos; 115 struct minimal_symbol* msymbol; 116 117 /* Find backward an address which is a symbol 118 and for which disassembling from that address will fill 119 completely the window. */ 120 pos = max_lines - 1; 121 do { 122 new_low -= 1 * max_lines; 123 msymbol = lookup_minimal_symbol_by_pc_section (new_low, 0); 124 125 if (msymbol) 126 new_low = SYMBOL_VALUE_ADDRESS (msymbol); 127 else 128 new_low += 1 * max_lines; 129 130 tui_disassemble (asm_lines, new_low, max_lines); 131 last_addr = asm_lines[pos].addr; 132 } while (last_addr > pc && msymbol); 133 134 /* Scan forward disassembling one instruction at a time 135 until the last visible instruction of the window 136 matches the pc. We keep the disassembled instructions 137 in the 'lines' window and shift it downward (increasing 138 its addresses). */ 139 if (last_addr < pc) 140 do 141 { 142 CORE_ADDR next_addr; 143 144 pos++; 145 if (pos >= max_lines) 146 pos = 0; 147 148 next_addr = tui_disassemble (&asm_lines[pos], last_addr, 1); 149 150 /* If there are some problems while disassembling exit. */ 151 if (next_addr <= last_addr) 152 break; 153 last_addr = next_addr; 154 } while (last_addr <= pc); 155 pos++; 156 if (pos >= max_lines) 157 pos = 0; 158 new_low = asm_lines[pos].addr; 159 } 160 for (i = 0; i < max_lines; i++) 161 { 162 xfree (asm_lines[i].addr_string); 163 xfree (asm_lines[i].insn); 164 } 165 return new_low; 166 } 167 168 /* Function to set the disassembly window's content. */ 169 enum tui_status 170 tui_set_disassem_content (CORE_ADDR pc) 171 { 172 enum tui_status ret = TUI_FAILURE; 173 int i; 174 int offset = TUI_DISASM_WIN->detail.source_info.horizontal_offset; 175 int line_width, max_lines; 176 CORE_ADDR cur_pc; 177 struct tui_gen_win_info * locator = tui_locator_win_info_ptr (); 178 int tab_len = tui_default_tab_len (); 179 struct tui_asm_line* asm_lines; 180 int insn_pos; 181 int addr_size, max_size; 182 char* line; 183 184 if (pc == 0) 185 return TUI_FAILURE; 186 187 ret = tui_alloc_source_buffer (TUI_DISASM_WIN); 188 if (ret != TUI_SUCCESS) 189 return ret; 190 191 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.addr = pc; 192 cur_pc = (CORE_ADDR) 193 (((struct tui_win_element *) locator->content[0])->which_element.locator.addr); 194 195 max_lines = TUI_DISASM_WIN->generic.height - 2; /* account for hilite */ 196 197 /* Get temporary table that will hold all strings (addr & insn). */ 198 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line) 199 * max_lines); 200 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines); 201 202 line_width = TUI_DISASM_WIN->generic.width - 1; 203 204 tui_disassemble (asm_lines, pc, max_lines); 205 206 /* See what is the maximum length of an address and of a line. */ 207 addr_size = 0; 208 max_size = 0; 209 for (i = 0; i < max_lines; i++) 210 { 211 size_t len = strlen (asm_lines[i].addr_string); 212 if (len > addr_size) 213 addr_size = len; 214 215 len = strlen (asm_lines[i].insn) + tab_len; 216 if (len > max_size) 217 max_size = len; 218 } 219 max_size += addr_size + tab_len; 220 221 /* Allocate memory to create each line. */ 222 line = (char*) alloca (max_size); 223 insn_pos = (1 + (addr_size / tab_len)) * tab_len; 224 225 /* Now construct each line */ 226 for (i = 0; i < max_lines; i++) 227 { 228 struct tui_win_element * element; 229 struct tui_source_element* src; 230 int cur_len; 231 232 element = (struct tui_win_element *) TUI_DISASM_WIN->generic.content[i]; 233 src = &element->which_element.source; 234 strcpy (line, asm_lines[i].addr_string); 235 cur_len = strlen (line); 236 237 /* Add spaces to make the instructions start on the same column */ 238 while (cur_len < insn_pos) 239 { 240 strcat (line, " "); 241 cur_len++; 242 } 243 244 strcat (line, asm_lines[i].insn); 245 246 /* Now copy the line taking the offset into account */ 247 if (strlen (line) > offset) 248 strcpy (src->line, &line[offset]); 249 else 250 src->line[0] = '\0'; 251 252 src->line_or_addr.addr = asm_lines[i].addr; 253 src->is_exec_point = asm_lines[i].addr == cur_pc; 254 255 /* See whether there is a breakpoint installed. */ 256 src->has_break = (!src->is_exec_point 257 && breakpoint_here_p (pc) != no_breakpoint_here); 258 259 xfree (asm_lines[i].addr_string); 260 xfree (asm_lines[i].insn); 261 } 262 TUI_DISASM_WIN->generic.content_size = i; 263 return TUI_SUCCESS; 264 } 265 266 267 /* Function to display the disassembly window with disassembled code. */ 268 void 269 tui_show_disassem (CORE_ADDR start_addr) 270 { 271 struct symtab *s = find_pc_symtab (start_addr); 272 struct tui_win_info * win_with_focus = tui_win_with_focus (); 273 union tui_line_or_address val; 274 275 val.addr = start_addr; 276 tui_add_win_to_layout (DISASSEM_WIN); 277 tui_update_source_window (TUI_DISASM_WIN, s, val, FALSE); 278 /* 279 ** if the focus was in the src win, put it in the asm win, if the 280 ** source view isn't split 281 */ 282 if (tui_current_layout () != SRC_DISASSEM_COMMAND && win_with_focus == TUI_SRC_WIN) 283 tui_set_win_focus_to (TUI_DISASM_WIN); 284 285 return; 286 } 287 288 289 /* Function to display the disassembly window. */ 290 void 291 tui_show_disassem_and_update_source (CORE_ADDR start_addr) 292 { 293 struct symtab_and_line sal; 294 295 tui_show_disassem (start_addr); 296 if (tui_current_layout () == SRC_DISASSEM_COMMAND) 297 { 298 union tui_line_or_address val; 299 300 /* 301 ** Update what is in the source window if it is displayed too, 302 ** note that it follows what is in the disassembly window and visa-versa 303 */ 304 sal = find_pc_line (start_addr, 0); 305 val.line_no = sal.line; 306 tui_update_source_window (TUI_SRC_WIN, sal.symtab, val, TRUE); 307 if (sal.symtab) 308 { 309 set_current_source_symtab_and_line (&sal); 310 tui_update_locator_filename (sal.symtab->filename); 311 } 312 else 313 tui_update_locator_filename ("?"); 314 } 315 316 return; 317 } 318 319 CORE_ADDR 320 tui_get_begin_asm_address (void) 321 { 322 struct tui_gen_win_info * locator; 323 struct tui_locator_element * element; 324 CORE_ADDR addr; 325 326 locator = tui_locator_win_info_ptr (); 327 element = &((struct tui_win_element *) locator->content[0])->which_element.locator; 328 329 if (element->addr == 0) 330 { 331 struct minimal_symbol *main_symbol; 332 333 /* Find address of the start of program. 334 Note: this should be language specific. */ 335 main_symbol = lookup_minimal_symbol ("main", NULL, NULL); 336 if (main_symbol == 0) 337 main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL); 338 if (main_symbol == 0) 339 main_symbol = lookup_minimal_symbol ("_start", NULL, NULL); 340 if (main_symbol) 341 addr = SYMBOL_VALUE_ADDRESS (main_symbol); 342 else 343 addr = 0; 344 } 345 else /* the target is executing */ 346 addr = element->addr; 347 348 return addr; 349 } 350 351 /* Determine what the low address will be to display in the TUI's 352 disassembly window. This may or may not be the same as the 353 low address input. */ 354 CORE_ADDR 355 tui_get_low_disassembly_address (CORE_ADDR low, CORE_ADDR pc) 356 { 357 int pos; 358 359 /* Determine where to start the disassembly so that the pc is about in the 360 middle of the viewport. */ 361 pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2; 362 pc = tui_find_disassembly_address (pc, -pos); 363 364 if (pc < low) 365 pc = low; 366 return pc; 367 } 368 369 /* Scroll the disassembly forward or backward vertically. */ 370 void 371 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction, 372 int num_to_scroll) 373 { 374 if (TUI_DISASM_WIN->generic.content != NULL) 375 { 376 CORE_ADDR pc; 377 tui_win_content content; 378 struct symtab *s; 379 union tui_line_or_address val; 380 int max_lines, dir; 381 struct symtab_and_line cursal = get_current_source_symtab_and_line (); 382 383 content = (tui_win_content) TUI_DISASM_WIN->generic.content; 384 if (cursal.symtab == (struct symtab *) NULL) 385 s = find_pc_symtab (get_frame_pc (deprecated_selected_frame)); 386 else 387 s = cursal.symtab; 388 389 /* account for hilite */ 390 max_lines = TUI_DISASM_WIN->generic.height - 2; 391 pc = content[0]->which_element.source.line_or_addr.addr; 392 dir = (scroll_direction == FORWARD_SCROLL) ? max_lines : - max_lines; 393 394 val.addr = tui_find_disassembly_address (pc, dir); 395 tui_update_source_window_as_is (TUI_DISASM_WIN, s, val, FALSE); 396 } 397 } 398