1 /* Disassembly display. 2 3 Copyright (C) 1998-2004, 2007-2012 Free Software Foundation, Inc. 4 5 Contributed by Hewlett-Packard Company. 6 7 This file is part of GDB. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 21 22 #include "defs.h" 23 #include "arch-utils.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 #include "progspace.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 gdbarch *gdbarch, struct tui_asm_line *asm_lines, 55 CORE_ADDR pc, int count) 56 { 57 struct ui_file *gdb_dis_out; 58 59 /* Now init the ui_file structure. */ 60 gdb_dis_out = tui_sfileopen (256); 61 62 /* Now construct each line. */ 63 for (; count > 0; count--, asm_lines++) 64 { 65 if (asm_lines->addr_string) 66 xfree (asm_lines->addr_string); 67 if (asm_lines->insn) 68 xfree (asm_lines->insn); 69 70 print_address (gdbarch, pc, gdb_dis_out); 71 asm_lines->addr = pc; 72 asm_lines->addr_string = xstrdup (tui_file_get_strbuf (gdb_dis_out)); 73 74 ui_file_rewind (gdb_dis_out); 75 76 pc = pc + gdb_print_insn (gdbarch, pc, gdb_dis_out, NULL); 77 78 asm_lines->insn = xstrdup (tui_file_get_strbuf (gdb_dis_out)); 79 80 /* Reset the buffer to empty. */ 81 ui_file_rewind (gdb_dis_out); 82 } 83 ui_file_delete (gdb_dis_out); 84 return pc; 85 } 86 87 /* Find the disassembly address that corresponds to FROM lines above 88 or below the PC. Variable sized instructions are taken into 89 account by the algorithm. */ 90 static CORE_ADDR 91 tui_find_disassembly_address (struct gdbarch *gdbarch, CORE_ADDR pc, int from) 92 { 93 CORE_ADDR new_low; 94 int max_lines; 95 int i; 96 struct tui_asm_line *asm_lines; 97 98 max_lines = (from > 0) ? from : - from; 99 if (max_lines <= 1) 100 return pc; 101 102 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line) 103 * max_lines); 104 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines); 105 106 new_low = pc; 107 if (from > 0) 108 { 109 tui_disassemble (gdbarch, asm_lines, pc, max_lines); 110 new_low = asm_lines[max_lines - 1].addr; 111 } 112 else 113 { 114 CORE_ADDR last_addr; 115 int pos; 116 struct minimal_symbol *msymbol; 117 118 /* Find backward an address which is a symbol and for which 119 disassembling from that address will fill completely the 120 window. */ 121 pos = max_lines - 1; 122 do { 123 new_low -= 1 * max_lines; 124 msymbol = lookup_minimal_symbol_by_pc_section (new_low, 0); 125 126 if (msymbol) 127 new_low = SYMBOL_VALUE_ADDRESS (msymbol); 128 else 129 new_low += 1 * max_lines; 130 131 tui_disassemble (gdbarch, asm_lines, new_low, max_lines); 132 last_addr = asm_lines[pos].addr; 133 } while (last_addr > pc && msymbol); 134 135 /* Scan forward disassembling one instruction at a time until 136 the last visible instruction of the window matches the pc. 137 We keep the disassembled instructions in the 'lines' window 138 and shift it downward (increasing 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 (gdbarch, &asm_lines[pos], 149 last_addr, 1); 150 151 /* If there are some problems while disassembling exit. */ 152 if (next_addr <= last_addr) 153 break; 154 last_addr = next_addr; 155 } while (last_addr <= pc); 156 pos++; 157 if (pos >= max_lines) 158 pos = 0; 159 new_low = asm_lines[pos].addr; 160 } 161 for (i = 0; i < max_lines; i++) 162 { 163 xfree (asm_lines[i].addr_string); 164 xfree (asm_lines[i].insn); 165 } 166 return new_low; 167 } 168 169 /* Function to set the disassembly window's content. */ 170 enum tui_status 171 tui_set_disassem_content (struct gdbarch *gdbarch, CORE_ADDR pc) 172 { 173 enum tui_status ret = TUI_FAILURE; 174 int i; 175 int offset = TUI_DISASM_WIN->detail.source_info.horizontal_offset; 176 int line_width, max_lines; 177 CORE_ADDR cur_pc; 178 struct tui_gen_win_info *locator = tui_locator_win_info_ptr (); 179 int tab_len = tui_default_tab_len (); 180 struct tui_asm_line *asm_lines; 181 int insn_pos; 182 int addr_size, max_size; 183 char *line; 184 185 if (pc == 0) 186 return TUI_FAILURE; 187 188 ret = tui_alloc_source_buffer (TUI_DISASM_WIN); 189 if (ret != TUI_SUCCESS) 190 return ret; 191 192 TUI_DISASM_WIN->detail.source_info.gdbarch = gdbarch; 193 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.loa = LOA_ADDRESS; 194 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.u.addr = pc; 195 cur_pc = (CORE_ADDR) (((struct tui_win_element *) 196 locator->content[0])->which_element.locator.addr); 197 198 max_lines = TUI_DISASM_WIN->generic.height - 2; /* Account for 199 hilite. */ 200 201 /* Get temporary table that will hold all strings (addr & insn). */ 202 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line) 203 * max_lines); 204 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines); 205 206 line_width = TUI_DISASM_WIN->generic.width - 1; 207 208 tui_disassemble (gdbarch, asm_lines, pc, max_lines); 209 210 /* See what is the maximum length of an address and of a line. */ 211 addr_size = 0; 212 max_size = 0; 213 for (i = 0; i < max_lines; i++) 214 { 215 size_t len = strlen (asm_lines[i].addr_string); 216 217 if (len > addr_size) 218 addr_size = len; 219 220 len = strlen (asm_lines[i].insn) + tab_len; 221 if (len > max_size) 222 max_size = len; 223 } 224 max_size += addr_size + tab_len; 225 226 /* Allocate memory to create each line. */ 227 line = (char*) alloca (max_size); 228 insn_pos = (1 + (addr_size / tab_len)) * tab_len; 229 230 /* Now construct each line. */ 231 for (i = 0; i < max_lines; i++) 232 { 233 struct tui_win_element *element; 234 struct tui_source_element *src; 235 int cur_len; 236 237 element = (struct tui_win_element *) TUI_DISASM_WIN->generic.content[i]; 238 src = &element->which_element.source; 239 strcpy (line, asm_lines[i].addr_string); 240 cur_len = strlen (line); 241 242 /* Add spaces to make the instructions start on the same 243 column. */ 244 while (cur_len < insn_pos) 245 { 246 strcat (line, " "); 247 cur_len++; 248 } 249 250 strcat (line, asm_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->line_or_addr.loa = LOA_ADDRESS; 259 src->line_or_addr.u.addr = asm_lines[i].addr; 260 src->is_exec_point = asm_lines[i].addr == cur_pc; 261 262 /* See whether there is a breakpoint installed. */ 263 src->has_break = (!src->is_exec_point 264 && breakpoint_here_p (current_program_space->aspace, 265 pc) 266 != no_breakpoint_here); 267 268 xfree (asm_lines[i].addr_string); 269 xfree (asm_lines[i].insn); 270 } 271 TUI_DISASM_WIN->generic.content_size = i; 272 return TUI_SUCCESS; 273 } 274 275 276 /* Function to display the disassembly window with disassembled code. */ 277 void 278 tui_show_disassem (struct gdbarch *gdbarch, CORE_ADDR start_addr) 279 { 280 struct symtab *s = find_pc_symtab (start_addr); 281 struct tui_win_info *win_with_focus = tui_win_with_focus (); 282 struct tui_line_or_address val; 283 284 val.loa = LOA_ADDRESS; 285 val.u.addr = start_addr; 286 tui_add_win_to_layout (DISASSEM_WIN); 287 tui_update_source_window (TUI_DISASM_WIN, gdbarch, s, val, FALSE); 288 289 /* If the focus was in the src win, put it in the asm win, if the 290 source view isn't split. */ 291 if (tui_current_layout () != SRC_DISASSEM_COMMAND 292 && win_with_focus == TUI_SRC_WIN) 293 tui_set_win_focus_to (TUI_DISASM_WIN); 294 295 return; 296 } 297 298 299 /* Function to display the disassembly window. */ 300 void 301 tui_show_disassem_and_update_source (struct gdbarch *gdbarch, 302 CORE_ADDR start_addr) 303 { 304 struct symtab_and_line sal; 305 306 tui_show_disassem (gdbarch, start_addr); 307 if (tui_current_layout () == SRC_DISASSEM_COMMAND) 308 { 309 struct tui_line_or_address val; 310 311 /* Update what is in the source window if it is displayed too, 312 note that it follows what is in the disassembly window and 313 visa-versa. */ 314 sal = find_pc_line (start_addr, 0); 315 val.loa = LOA_LINE; 316 val.u.line_no = sal.line; 317 tui_update_source_window (TUI_SRC_WIN, gdbarch, sal.symtab, val, TRUE); 318 if (sal.symtab) 319 { 320 set_current_source_symtab_and_line (&sal); 321 tui_update_locator_filename (sal.symtab->filename); 322 } 323 else 324 tui_update_locator_filename ("?"); 325 } 326 327 return; 328 } 329 330 void 331 tui_get_begin_asm_address (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p) 332 { 333 struct tui_gen_win_info *locator; 334 struct tui_locator_element *element; 335 struct gdbarch *gdbarch = get_current_arch (); 336 CORE_ADDR addr; 337 338 locator = tui_locator_win_info_ptr (); 339 element = &((struct tui_win_element *) 340 locator->content[0])->which_element.locator; 341 342 if (element->addr == 0) 343 { 344 struct minimal_symbol *main_symbol; 345 346 /* Find address of the start of program. 347 Note: this should be language specific. */ 348 main_symbol = lookup_minimal_symbol ("main", NULL, NULL); 349 if (main_symbol == 0) 350 main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL); 351 if (main_symbol == 0) 352 main_symbol = lookup_minimal_symbol ("_start", NULL, NULL); 353 if (main_symbol) 354 addr = SYMBOL_VALUE_ADDRESS (main_symbol); 355 else 356 addr = 0; 357 } 358 else /* The target is executing. */ 359 { 360 gdbarch = element->gdbarch; 361 addr = element->addr; 362 } 363 364 *gdbarch_p = gdbarch; 365 *addr_p = addr; 366 } 367 368 /* Determine what the low address will be to display in the TUI's 369 disassembly window. This may or may not be the same as the low 370 address input. */ 371 CORE_ADDR 372 tui_get_low_disassembly_address (struct gdbarch *gdbarch, 373 CORE_ADDR low, CORE_ADDR pc) 374 { 375 int pos; 376 377 /* Determine where to start the disassembly so that the pc is about 378 in the middle of the viewport. */ 379 pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2; 380 pc = tui_find_disassembly_address (gdbarch, pc, -pos); 381 382 if (pc < low) 383 pc = low; 384 return pc; 385 } 386 387 /* Scroll the disassembly forward or backward vertically. */ 388 void 389 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction, 390 int num_to_scroll) 391 { 392 if (TUI_DISASM_WIN->generic.content != NULL) 393 { 394 struct gdbarch *gdbarch = TUI_DISASM_WIN->detail.source_info.gdbarch; 395 CORE_ADDR pc; 396 tui_win_content content; 397 struct tui_line_or_address val; 398 int dir; 399 400 content = (tui_win_content) TUI_DISASM_WIN->generic.content; 401 402 pc = content[0]->which_element.source.line_or_addr.u.addr; 403 num_to_scroll++; 404 dir = (scroll_direction == FORWARD_SCROLL) 405 ? num_to_scroll : -num_to_scroll; 406 407 val.loa = LOA_ADDRESS; 408 val.u.addr = tui_find_disassembly_address (gdbarch, pc, dir); 409 tui_update_source_window_as_is (TUI_DISASM_WIN, gdbarch, 410 NULL, val, FALSE); 411 } 412 } 413