1 /* Disassembly display. 2 3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009 4 Free Software 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 3 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, see <http://www.gnu.org/licenses/>. */ 22 23 #include "defs.h" 24 #include "symtab.h" 25 #include "breakpoint.h" 26 #include "frame.h" 27 #include "value.h" 28 #include "source.h" 29 #include "disasm.h" 30 #include "gdb_string.h" 31 #include "tui/tui.h" 32 #include "tui/tui-data.h" 33 #include "tui/tui-win.h" 34 #include "tui/tui-layout.h" 35 #include "tui/tui-winsource.h" 36 #include "tui/tui-stack.h" 37 #include "tui/tui-file.h" 38 #include "tui/tui-disasm.h" 39 40 #include "gdb_curses.h" 41 42 struct tui_asm_line 43 { 44 CORE_ADDR addr; 45 char *addr_string; 46 char *insn; 47 }; 48 49 /* Function to set the disassembly window's content. 50 Disassemble count lines starting at pc. 51 Return address of the count'th instruction after pc. */ 52 static CORE_ADDR 53 tui_disassemble (struct gdbarch *gdbarch, struct tui_asm_line *asm_lines, 54 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 (gdbarch, 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 (gdbarch, pc, gdb_dis_out, NULL); 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 above 87 or below the PC. Variable sized instructions are taken into 88 account by the algorithm. */ 89 static CORE_ADDR 90 tui_find_disassembly_address (struct gdbarch *gdbarch, 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 (gdbarch, 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 and for which 118 disassembling from that address will fill completely the 119 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 (gdbarch, 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 until 135 the last visible instruction of the window matches the pc. 136 We keep the disassembled instructions in the 'lines' window 137 and shift it downward (increasing its addresses). */ 138 if (last_addr < pc) 139 do 140 { 141 CORE_ADDR next_addr; 142 143 pos++; 144 if (pos >= max_lines) 145 pos = 0; 146 147 next_addr = tui_disassemble (gdbarch, &asm_lines[pos], 148 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 (struct gdbarch *gdbarch, 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.gdbarch = gdbarch; 192 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.loa = LOA_ADDRESS; 193 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.u.addr = pc; 194 cur_pc = (CORE_ADDR) 195 (((struct tui_win_element *) locator->content[0])->which_element.locator.addr); 196 197 max_lines = TUI_DISASM_WIN->generic.height - 2; /* Account for 198 hilite. */ 199 200 /* Get temporary table that will hold all strings (addr & insn). */ 201 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line) 202 * max_lines); 203 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines); 204 205 line_width = TUI_DISASM_WIN->generic.width - 1; 206 207 tui_disassemble (gdbarch, asm_lines, pc, max_lines); 208 209 /* See what is the maximum length of an address and of a line. */ 210 addr_size = 0; 211 max_size = 0; 212 for (i = 0; i < max_lines; i++) 213 { 214 size_t len = strlen (asm_lines[i].addr_string); 215 if (len > addr_size) 216 addr_size = len; 217 218 len = strlen (asm_lines[i].insn) + tab_len; 219 if (len > max_size) 220 max_size = len; 221 } 222 max_size += addr_size + tab_len; 223 224 /* Allocate memory to create each line. */ 225 line = (char*) alloca (max_size); 226 insn_pos = (1 + (addr_size / tab_len)) * tab_len; 227 228 /* Now construct each line. */ 229 for (i = 0; i < max_lines; i++) 230 { 231 struct tui_win_element *element; 232 struct tui_source_element *src; 233 int cur_len; 234 235 element = (struct tui_win_element *) TUI_DISASM_WIN->generic.content[i]; 236 src = &element->which_element.source; 237 strcpy (line, asm_lines[i].addr_string); 238 cur_len = strlen (line); 239 240 /* Add spaces to make the instructions start on the same 241 column. */ 242 while (cur_len < insn_pos) 243 { 244 strcat (line, " "); 245 cur_len++; 246 } 247 248 strcat (line, asm_lines[i].insn); 249 250 /* Now copy the line taking the offset into account. */ 251 if (strlen (line) > offset) 252 strcpy (src->line, &line[offset]); 253 else 254 src->line[0] = '\0'; 255 256 src->line_or_addr.loa = LOA_ADDRESS; 257 src->line_or_addr.u.addr = asm_lines[i].addr; 258 src->is_exec_point = asm_lines[i].addr == cur_pc; 259 260 /* See whether there is a breakpoint installed. */ 261 src->has_break = (!src->is_exec_point 262 && breakpoint_here_p (pc) != no_breakpoint_here); 263 264 xfree (asm_lines[i].addr_string); 265 xfree (asm_lines[i].insn); 266 } 267 TUI_DISASM_WIN->generic.content_size = i; 268 return TUI_SUCCESS; 269 } 270 271 272 /* Function to display the disassembly window with disassembled code. */ 273 void 274 tui_show_disassem (struct gdbarch *gdbarch, CORE_ADDR start_addr) 275 { 276 struct symtab *s = find_pc_symtab (start_addr); 277 struct tui_win_info *win_with_focus = tui_win_with_focus (); 278 struct tui_line_or_address val; 279 280 val.loa = LOA_ADDRESS; 281 val.u.addr = start_addr; 282 tui_add_win_to_layout (DISASSEM_WIN); 283 tui_update_source_window (TUI_DISASM_WIN, gdbarch, s, val, FALSE); 284 285 /* If the focus was in the src win, put it in the asm win, if the 286 source view isn't split. */ 287 if (tui_current_layout () != SRC_DISASSEM_COMMAND 288 && win_with_focus == TUI_SRC_WIN) 289 tui_set_win_focus_to (TUI_DISASM_WIN); 290 291 return; 292 } 293 294 295 /* Function to display the disassembly window. */ 296 void 297 tui_show_disassem_and_update_source (struct gdbarch *gdbarch, 298 CORE_ADDR start_addr) 299 { 300 struct symtab_and_line sal; 301 302 tui_show_disassem (gdbarch, start_addr); 303 if (tui_current_layout () == SRC_DISASSEM_COMMAND) 304 { 305 struct tui_line_or_address val; 306 307 /* Update what is in the source window if it is displayed too, 308 note that it follows what is in the disassembly window and 309 visa-versa. */ 310 sal = find_pc_line (start_addr, 0); 311 val.loa = LOA_LINE; 312 val.u.line_no = sal.line; 313 tui_update_source_window (TUI_SRC_WIN, gdbarch, sal.symtab, val, TRUE); 314 if (sal.symtab) 315 { 316 set_current_source_symtab_and_line (&sal); 317 tui_update_locator_filename (sal.symtab->filename); 318 } 319 else 320 tui_update_locator_filename ("?"); 321 } 322 323 return; 324 } 325 326 void 327 tui_get_begin_asm_address (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p) 328 { 329 struct tui_gen_win_info *locator; 330 struct tui_locator_element *element; 331 struct gdbarch *gdbarch = NULL; 332 CORE_ADDR addr; 333 334 locator = tui_locator_win_info_ptr (); 335 element = &((struct tui_win_element *) locator->content[0])->which_element.locator; 336 337 if (element->addr == 0) 338 { 339 struct minimal_symbol *main_symbol; 340 341 /* Find address of the start of program. 342 Note: this should be language specific. */ 343 main_symbol = lookup_minimal_symbol ("main", NULL, NULL); 344 if (main_symbol == 0) 345 main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL); 346 if (main_symbol == 0) 347 main_symbol = lookup_minimal_symbol ("_start", NULL, NULL); 348 if (main_symbol) 349 addr = SYMBOL_VALUE_ADDRESS (main_symbol); 350 else 351 addr = 0; 352 } 353 else /* The target is executing. */ 354 { 355 gdbarch = element->gdbarch; 356 addr = element->addr; 357 } 358 359 *gdbarch_p = gdbarch; 360 *addr_p = addr; 361 } 362 363 /* Determine what the low address will be to display in the TUI's 364 disassembly window. This may or may not be the same as the low 365 address input. */ 366 CORE_ADDR 367 tui_get_low_disassembly_address (struct gdbarch *gdbarch, 368 CORE_ADDR low, CORE_ADDR pc) 369 { 370 int pos; 371 372 /* Determine where to start the disassembly so that the pc is about 373 in the middle of the viewport. */ 374 pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2; 375 pc = tui_find_disassembly_address (gdbarch, pc, -pos); 376 377 if (pc < low) 378 pc = low; 379 return pc; 380 } 381 382 /* Scroll the disassembly forward or backward vertically. */ 383 void 384 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction, 385 int num_to_scroll) 386 { 387 if (TUI_DISASM_WIN->generic.content != NULL) 388 { 389 struct gdbarch *gdbarch = TUI_DISASM_WIN->detail.source_info.gdbarch; 390 CORE_ADDR pc; 391 tui_win_content content; 392 struct tui_line_or_address val; 393 int dir; 394 395 content = (tui_win_content) TUI_DISASM_WIN->generic.content; 396 397 pc = content[0]->which_element.source.line_or_addr.u.addr; 398 num_to_scroll++; 399 dir = (scroll_direction == FORWARD_SCROLL) ? num_to_scroll : -num_to_scroll; 400 401 val.loa = LOA_ADDRESS; 402 val.u.addr = tui_find_disassembly_address (gdbarch, pc, dir); 403 tui_update_source_window_as_is (TUI_DISASM_WIN, gdbarch, NULL, val, FALSE); 404 } 405 } 406