1 /* Disassembly display. 2 3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 4 2010 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 "arch-utils.h" 25 #include "symtab.h" 26 #include "breakpoint.h" 27 #include "frame.h" 28 #include "value.h" 29 #include "source.h" 30 #include "disasm.h" 31 #include "gdb_string.h" 32 #include "tui/tui.h" 33 #include "tui/tui-data.h" 34 #include "tui/tui-win.h" 35 #include "tui/tui-layout.h" 36 #include "tui/tui-winsource.h" 37 #include "tui/tui-stack.h" 38 #include "tui/tui-file.h" 39 #include "tui/tui-disasm.h" 40 #include "progspace.h" 41 42 #include "gdb_curses.h" 43 44 struct tui_asm_line 45 { 46 CORE_ADDR addr; 47 char *addr_string; 48 char *insn; 49 }; 50 51 /* Function to set the disassembly window's content. 52 Disassemble count lines starting at pc. 53 Return address of the count'th instruction after pc. */ 54 static CORE_ADDR 55 tui_disassemble (struct gdbarch *gdbarch, struct tui_asm_line *asm_lines, 56 CORE_ADDR pc, int count) 57 { 58 struct ui_file *gdb_dis_out; 59 60 /* Now init the ui_file structure. */ 61 gdb_dis_out = tui_sfileopen (256); 62 63 /* Now construct each line. */ 64 for (; count > 0; count--, asm_lines++) 65 { 66 if (asm_lines->addr_string) 67 xfree (asm_lines->addr_string); 68 if (asm_lines->insn) 69 xfree (asm_lines->insn); 70 71 print_address (gdbarch, pc, gdb_dis_out); 72 asm_lines->addr = pc; 73 asm_lines->addr_string = xstrdup (tui_file_get_strbuf (gdb_dis_out)); 74 75 ui_file_rewind (gdb_dis_out); 76 77 pc = pc + gdb_print_insn (gdbarch, pc, gdb_dis_out, NULL); 78 79 asm_lines->insn = xstrdup (tui_file_get_strbuf (gdb_dis_out)); 80 81 /* Reset the buffer to empty. */ 82 ui_file_rewind (gdb_dis_out); 83 } 84 ui_file_delete (gdb_dis_out); 85 return pc; 86 } 87 88 /* Find the disassembly address that corresponds to FROM lines above 89 or below the PC. Variable sized instructions are taken into 90 account by the algorithm. */ 91 static CORE_ADDR 92 tui_find_disassembly_address (struct gdbarch *gdbarch, CORE_ADDR pc, int from) 93 { 94 CORE_ADDR new_low; 95 int max_lines; 96 int i; 97 struct tui_asm_line *asm_lines; 98 99 max_lines = (from > 0) ? from : - from; 100 if (max_lines <= 1) 101 return pc; 102 103 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line) 104 * max_lines); 105 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines); 106 107 new_low = pc; 108 if (from > 0) 109 { 110 tui_disassemble (gdbarch, asm_lines, pc, max_lines); 111 new_low = asm_lines[max_lines - 1].addr; 112 } 113 else 114 { 115 CORE_ADDR last_addr; 116 int pos; 117 struct minimal_symbol *msymbol; 118 119 /* Find backward an address which is a symbol and for which 120 disassembling from that address will fill completely the 121 window. */ 122 pos = max_lines - 1; 123 do { 124 new_low -= 1 * max_lines; 125 msymbol = lookup_minimal_symbol_by_pc_section (new_low, 0); 126 127 if (msymbol) 128 new_low = SYMBOL_VALUE_ADDRESS (msymbol); 129 else 130 new_low += 1 * max_lines; 131 132 tui_disassemble (gdbarch, asm_lines, new_low, max_lines); 133 last_addr = asm_lines[pos].addr; 134 } while (last_addr > pc && msymbol); 135 136 /* Scan forward disassembling one instruction at a time until 137 the last visible instruction of the window matches the pc. 138 We keep the disassembled instructions in the 'lines' window 139 and shift it downward (increasing its addresses). */ 140 if (last_addr < pc) 141 do 142 { 143 CORE_ADDR next_addr; 144 145 pos++; 146 if (pos >= max_lines) 147 pos = 0; 148 149 next_addr = tui_disassemble (gdbarch, &asm_lines[pos], 150 last_addr, 1); 151 152 /* If there are some problems while disassembling exit. */ 153 if (next_addr <= last_addr) 154 break; 155 last_addr = next_addr; 156 } while (last_addr <= pc); 157 pos++; 158 if (pos >= max_lines) 159 pos = 0; 160 new_low = asm_lines[pos].addr; 161 } 162 for (i = 0; i < max_lines; i++) 163 { 164 xfree (asm_lines[i].addr_string); 165 xfree (asm_lines[i].insn); 166 } 167 return new_low; 168 } 169 170 /* Function to set the disassembly window's content. */ 171 enum tui_status 172 tui_set_disassem_content (struct gdbarch *gdbarch, CORE_ADDR pc) 173 { 174 enum tui_status ret = TUI_FAILURE; 175 int i; 176 int offset = TUI_DISASM_WIN->detail.source_info.horizontal_offset; 177 int line_width, max_lines; 178 CORE_ADDR cur_pc; 179 struct tui_gen_win_info *locator = tui_locator_win_info_ptr (); 180 int tab_len = tui_default_tab_len (); 181 struct tui_asm_line *asm_lines; 182 int insn_pos; 183 int addr_size, max_size; 184 char *line; 185 186 if (pc == 0) 187 return TUI_FAILURE; 188 189 ret = tui_alloc_source_buffer (TUI_DISASM_WIN); 190 if (ret != TUI_SUCCESS) 191 return ret; 192 193 TUI_DISASM_WIN->detail.source_info.gdbarch = gdbarch; 194 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.loa = LOA_ADDRESS; 195 TUI_DISASM_WIN->detail.source_info.start_line_or_addr.u.addr = pc; 196 cur_pc = (CORE_ADDR) 197 (((struct tui_win_element *) locator->content[0])->which_element.locator.addr); 198 199 max_lines = TUI_DISASM_WIN->generic.height - 2; /* Account for 200 hilite. */ 201 202 /* Get temporary table that will hold all strings (addr & insn). */ 203 asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line) 204 * max_lines); 205 memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines); 206 207 line_width = TUI_DISASM_WIN->generic.width - 1; 208 209 tui_disassemble (gdbarch, asm_lines, pc, max_lines); 210 211 /* See what is the maximum length of an address and of a line. */ 212 addr_size = 0; 213 max_size = 0; 214 for (i = 0; i < max_lines; i++) 215 { 216 size_t len = strlen (asm_lines[i].addr_string); 217 218 if (len > addr_size) 219 addr_size = len; 220 221 len = strlen (asm_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 < max_lines; i++) 233 { 234 struct tui_win_element *element; 235 struct tui_source_element *src; 236 int cur_len; 237 238 element = (struct tui_win_element *) TUI_DISASM_WIN->generic.content[i]; 239 src = &element->which_element.source; 240 strcpy (line, asm_lines[i].addr_string); 241 cur_len = strlen (line); 242 243 /* Add spaces to make the instructions start on the same 244 column. */ 245 while (cur_len < insn_pos) 246 { 247 strcat (line, " "); 248 cur_len++; 249 } 250 251 strcat (line, asm_lines[i].insn); 252 253 /* Now copy the line taking the offset into account. */ 254 if (strlen (line) > offset) 255 strcpy (src->line, &line[offset]); 256 else 257 src->line[0] = '\0'; 258 259 src->line_or_addr.loa = LOA_ADDRESS; 260 src->line_or_addr.u.addr = asm_lines[i].addr; 261 src->is_exec_point = asm_lines[i].addr == cur_pc; 262 263 /* See whether there is a breakpoint installed. */ 264 src->has_break = (!src->is_exec_point 265 && breakpoint_here_p (current_program_space->aspace, 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 *) locator->content[0])->which_element.locator; 340 341 if (element->addr == 0) 342 { 343 struct minimal_symbol *main_symbol; 344 345 /* Find address of the start of program. 346 Note: this should be language specific. */ 347 main_symbol = lookup_minimal_symbol ("main", NULL, NULL); 348 if (main_symbol == 0) 349 main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL); 350 if (main_symbol == 0) 351 main_symbol = lookup_minimal_symbol ("_start", NULL, NULL); 352 if (main_symbol) 353 addr = SYMBOL_VALUE_ADDRESS (main_symbol); 354 else 355 addr = 0; 356 } 357 else /* The target is executing. */ 358 { 359 gdbarch = element->gdbarch; 360 addr = element->addr; 361 } 362 363 *gdbarch_p = gdbarch; 364 *addr_p = addr; 365 } 366 367 /* Determine what the low address will be to display in the TUI's 368 disassembly window. This may or may not be the same as the low 369 address input. */ 370 CORE_ADDR 371 tui_get_low_disassembly_address (struct gdbarch *gdbarch, 372 CORE_ADDR low, CORE_ADDR pc) 373 { 374 int pos; 375 376 /* Determine where to start the disassembly so that the pc is about 377 in the middle of the viewport. */ 378 pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2; 379 pc = tui_find_disassembly_address (gdbarch, pc, -pos); 380 381 if (pc < low) 382 pc = low; 383 return pc; 384 } 385 386 /* Scroll the disassembly forward or backward vertically. */ 387 void 388 tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction, 389 int num_to_scroll) 390 { 391 if (TUI_DISASM_WIN->generic.content != NULL) 392 { 393 struct gdbarch *gdbarch = TUI_DISASM_WIN->detail.source_info.gdbarch; 394 CORE_ADDR pc; 395 tui_win_content content; 396 struct tui_line_or_address val; 397 int dir; 398 399 content = (tui_win_content) TUI_DISASM_WIN->generic.content; 400 401 pc = content[0]->which_element.source.line_or_addr.u.addr; 402 num_to_scroll++; 403 dir = (scroll_direction == FORWARD_SCROLL) ? num_to_scroll : -num_to_scroll; 404 405 val.loa = LOA_ADDRESS; 406 val.u.addr = tui_find_disassembly_address (gdbarch, pc, dir); 407 tui_update_source_window_as_is (TUI_DISASM_WIN, gdbarch, NULL, val, FALSE); 408 } 409 } 410