| 1 | /* Disassembly display. |
| 2 | |
| 3 | Copyright (C) 1998-2017 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 "tui/tui.h" |
| 31 | #include "tui/tui-data.h" |
| 32 | #include "tui/tui-win.h" |
| 33 | #include "tui/tui-layout.h" |
| 34 | #include "tui/tui-winsource.h" |
| 35 | #include "tui/tui-stack.h" |
| 36 | #include "tui/tui-file.h" |
| 37 | #include "tui/tui-disasm.h" |
| 38 | #include "progspace.h" |
| 39 | #include "objfiles.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 = XALLOCAVEC (struct tui_asm_line, 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 bound_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.minsym) |
| 126 | new_low = BMSYMBOL_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.minsym); |
| 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 max_lines, line_width; |
| 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, insn_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 = locator->content[0]->which_element.locator.addr; |
| 195 | |
| 196 | /* Window size, excluding highlight box. */ |
| 197 | max_lines = TUI_DISASM_WIN->generic.height - 2; |
| 198 | line_width = TUI_DISASM_WIN->generic.width - 2; |
| 199 | |
| 200 | /* Get temporary table that will hold all strings (addr & insn). */ |
| 201 | asm_lines = XALLOCAVEC (struct tui_asm_line, max_lines); |
| 202 | memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines); |
| 203 | |
| 204 | tui_disassemble (gdbarch, asm_lines, pc, max_lines); |
| 205 | |
| 206 | /* Determine maximum address- and instruction lengths. */ |
| 207 | addr_size = 0; |
| 208 | insn_size = 0; |
| 209 | for (i = 0; i < max_lines; i++) |
| 210 | { |
| 211 | size_t len = strlen (asm_lines[i].addr_string); |
| 212 | |
| 213 | if (len > addr_size) |
| 214 | addr_size = len; |
| 215 | |
| 216 | len = strlen (asm_lines[i].insn); |
| 217 | if (len > insn_size) |
| 218 | insn_size = len; |
| 219 | } |
| 220 | |
| 221 | /* Align instructions to the same column. */ |
| 222 | insn_pos = (1 + (addr_size / tab_len)) * tab_len; |
| 223 | |
| 224 | /* Allocate memory to create each line. */ |
| 225 | line = (char*) alloca (insn_pos + insn_size + 1); |
| 226 | |
| 227 | /* Now construct each line. */ |
| 228 | for (i = 0; i < max_lines; i++) |
| 229 | { |
| 230 | struct tui_win_element *element; |
| 231 | struct tui_source_element *src; |
| 232 | int cur_len; |
| 233 | |
| 234 | element = TUI_DISASM_WIN->generic.content[i]; |
| 235 | src = &element->which_element.source; |
| 236 | strcpy (line, asm_lines[i].addr_string); |
| 237 | cur_len = strlen (line); |
| 238 | memset (line + cur_len, ' ', insn_pos - cur_len); |
| 239 | strcpy (line + insn_pos, asm_lines[i].insn); |
| 240 | |
| 241 | /* Now copy the line taking the offset into account. */ |
| 242 | if (strlen (line) > offset) |
| 243 | { |
| 244 | strncpy (src->line, &line[offset], line_width); |
| 245 | src->line[line_width] = '\0'; |
| 246 | } |
| 247 | else |
| 248 | src->line[0] = '\0'; |
| 249 | |
| 250 | src->line_or_addr.loa = LOA_ADDRESS; |
| 251 | src->line_or_addr.u.addr = asm_lines[i].addr; |
| 252 | src->is_exec_point = asm_lines[i].addr == cur_pc; |
| 253 | |
| 254 | /* See whether there is a breakpoint installed. */ |
| 255 | src->has_break = (!src->is_exec_point |
| 256 | && breakpoint_here_p (current_program_space->aspace, |
| 257 | pc) |
| 258 | != no_breakpoint_here); |
| 259 | |
| 260 | xfree (asm_lines[i].addr_string); |
| 261 | xfree (asm_lines[i].insn); |
| 262 | } |
| 263 | TUI_DISASM_WIN->generic.content_size = i; |
| 264 | return TUI_SUCCESS; |
| 265 | } |
| 266 | |
| 267 | |
| 268 | /* Function to display the disassembly window with disassembled code. */ |
| 269 | void |
| 270 | tui_show_disassem (struct gdbarch *gdbarch, CORE_ADDR start_addr) |
| 271 | { |
| 272 | struct symtab *s = find_pc_line_symtab (start_addr); |
| 273 | struct tui_win_info *win_with_focus = tui_win_with_focus (); |
| 274 | struct tui_line_or_address val; |
| 275 | |
| 276 | val.loa = LOA_ADDRESS; |
| 277 | val.u.addr = start_addr; |
| 278 | tui_add_win_to_layout (DISASSEM_WIN); |
| 279 | tui_update_source_window (TUI_DISASM_WIN, gdbarch, s, val, FALSE); |
| 280 | |
| 281 | /* If the focus was in the src win, put it in the asm win, if the |
| 282 | source view isn't split. */ |
| 283 | if (tui_current_layout () != SRC_DISASSEM_COMMAND |
| 284 | && win_with_focus == TUI_SRC_WIN) |
| 285 | tui_set_win_focus_to (TUI_DISASM_WIN); |
| 286 | |
| 287 | return; |
| 288 | } |
| 289 | |
| 290 | |
| 291 | /* Function to display the disassembly window. */ |
| 292 | void |
| 293 | tui_show_disassem_and_update_source (struct gdbarch *gdbarch, |
| 294 | CORE_ADDR start_addr) |
| 295 | { |
| 296 | struct symtab_and_line sal; |
| 297 | |
| 298 | tui_show_disassem (gdbarch, start_addr); |
| 299 | if (tui_current_layout () == SRC_DISASSEM_COMMAND) |
| 300 | { |
| 301 | struct tui_line_or_address val; |
| 302 | |
| 303 | /* Update what is in the source window if it is displayed too, |
| 304 | note that it follows what is in the disassembly window and |
| 305 | visa-versa. */ |
| 306 | sal = find_pc_line (start_addr, 0); |
| 307 | val.loa = LOA_LINE; |
| 308 | val.u.line_no = sal.line; |
| 309 | tui_update_source_window (TUI_SRC_WIN, gdbarch, sal.symtab, val, TRUE); |
| 310 | if (sal.symtab) |
| 311 | { |
| 312 | set_current_source_symtab_and_line (&sal); |
| 313 | tui_update_locator_fullname (symtab_to_fullname (sal.symtab)); |
| 314 | } |
| 315 | else |
| 316 | tui_update_locator_fullname ("?"); |
| 317 | } |
| 318 | |
| 319 | return; |
| 320 | } |
| 321 | |
| 322 | void |
| 323 | tui_get_begin_asm_address (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p) |
| 324 | { |
| 325 | struct tui_gen_win_info *locator; |
| 326 | struct tui_locator_element *element; |
| 327 | struct gdbarch *gdbarch = get_current_arch (); |
| 328 | CORE_ADDR addr; |
| 329 | |
| 330 | locator = tui_locator_win_info_ptr (); |
| 331 | element = &locator->content[0]->which_element.locator; |
| 332 | |
| 333 | if (element->addr == 0) |
| 334 | { |
| 335 | struct bound_minimal_symbol main_symbol; |
| 336 | |
| 337 | /* Find address of the start of program. |
| 338 | Note: this should be language specific. */ |
| 339 | main_symbol = lookup_minimal_symbol ("main", NULL, NULL); |
| 340 | if (main_symbol.minsym == 0) |
| 341 | main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL); |
| 342 | if (main_symbol.minsym == 0) |
| 343 | main_symbol = lookup_minimal_symbol ("_start", NULL, NULL); |
| 344 | if (main_symbol.minsym) |
| 345 | addr = BMSYMBOL_VALUE_ADDRESS (main_symbol); |
| 346 | else |
| 347 | addr = 0; |
| 348 | } |
| 349 | else /* The target is executing. */ |
| 350 | { |
| 351 | gdbarch = element->gdbarch; |
| 352 | addr = element->addr; |
| 353 | } |
| 354 | |
| 355 | *gdbarch_p = gdbarch; |
| 356 | *addr_p = addr; |
| 357 | } |
| 358 | |
| 359 | /* Determine what the low address will be to display in the TUI's |
| 360 | disassembly window. This may or may not be the same as the low |
| 361 | address input. */ |
| 362 | CORE_ADDR |
| 363 | tui_get_low_disassembly_address (struct gdbarch *gdbarch, |
| 364 | CORE_ADDR low, CORE_ADDR pc) |
| 365 | { |
| 366 | int pos; |
| 367 | |
| 368 | /* Determine where to start the disassembly so that the pc is about |
| 369 | in the middle of the viewport. */ |
| 370 | pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2; |
| 371 | pc = tui_find_disassembly_address (gdbarch, pc, -pos); |
| 372 | |
| 373 | if (pc < low) |
| 374 | pc = low; |
| 375 | return pc; |
| 376 | } |
| 377 | |
| 378 | /* Scroll the disassembly forward or backward vertically. */ |
| 379 | void |
| 380 | tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction, |
| 381 | int num_to_scroll) |
| 382 | { |
| 383 | if (TUI_DISASM_WIN->generic.content != NULL) |
| 384 | { |
| 385 | struct gdbarch *gdbarch = TUI_DISASM_WIN->detail.source_info.gdbarch; |
| 386 | CORE_ADDR pc; |
| 387 | tui_win_content content; |
| 388 | struct tui_line_or_address val; |
| 389 | int dir; |
| 390 | |
| 391 | content = (tui_win_content) TUI_DISASM_WIN->generic.content; |
| 392 | |
| 393 | pc = content[0]->which_element.source.line_or_addr.u.addr; |
| 394 | num_to_scroll++; |
| 395 | dir = (scroll_direction == FORWARD_SCROLL) |
| 396 | ? num_to_scroll : -num_to_scroll; |
| 397 | |
| 398 | val.loa = LOA_ADDRESS; |
| 399 | val.u.addr = tui_find_disassembly_address (gdbarch, pc, dir); |
| 400 | tui_update_source_window_as_is (TUI_DISASM_WIN, gdbarch, |
| 401 | NULL, val, FALSE); |
| 402 | } |
| 403 | } |