drivers/acpi/acpica/dbxface.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: dbxface - AML Debugger external interfaces
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2017, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "amlcode.h"
  47 #include "acdebug.h"
  48 #include "acinterp.h"
  49
  50 #define _COMPONENT          ACPI_CA_DEBUGGER
  51 ACPI_MODULE_NAME("dbxface")
  52
  53 /* Local prototypes */
  54 static acpi_status
  55 acpi_db_start_command(struct acpi_walk_state *walk_state,
  56                       union acpi_parse_object *op);
  57
  58 #ifdef ACPI_OBSOLETE_FUNCTIONS
  59 void acpi_db_method_end(struct acpi_walk_state *walk_state);
  60 #endif
  61
  62 /*******************************************************************************
  63  *
  64  * FUNCTION:    acpi_db_start_command
  65  *
  66  * PARAMETERS:  walk_state      - Current walk
  67  *              op              - Current executing Op, from AML interpreter
  68  *
  69  * RETURN:      Status
  70  *
  71  * DESCRIPTION: Enter debugger command loop
  72  *
  73  ******************************************************************************/
  74
  75 static acpi_status
  76 acpi_db_start_command(struct acpi_walk_state *walk_state,
  77                       union acpi_parse_object *op)
  78 {
  79         acpi_status status;
  80
  81         /* TBD: [Investigate] are there namespace locking issues here? */
  82
  83         /* acpi_ut_release_mutex (ACPI_MTX_NAMESPACE); */
  84
  85         /* Go into the command loop and await next user command */
  86
  87         acpi_gbl_method_executing = TRUE;
  88         status = AE_CTRL_TRUE;
  89
  90         while (status == AE_CTRL_TRUE) {
  91
  92                 /* Notify the completion of the command */
  93
  94                 status = acpi_os_notify_command_complete();
  95                 if (ACPI_FAILURE(status)) {
  96                         goto error_exit;
  97                 }
  98
  99                 /* Wait the readiness of the command */
 100
 101                 status = acpi_os_wait_command_ready();
 102                 if (ACPI_FAILURE(status)) {
 103                         goto error_exit;
 104                 }
 105
 106                 status =
 107                     acpi_db_command_dispatch(acpi_gbl_db_line_buf, walk_state,
 108                                              op);
 109         }
 110
 111         /* acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE); */
 112
 113 error_exit:
 114         if (ACPI_FAILURE(status) && status != AE_CTRL_TERMINATE) {
 115                 ACPI_EXCEPTION((AE_INFO, status,
 116                                 "While parsing/handling command line"));
 117         }
 118         return (status);
 119 }
 120
 121 /*******************************************************************************
 122  *
 123  * FUNCTION:    acpi_db_signal_break_point
 124  *
 125  * PARAMETERS:  walk_state      - Current walk
 126  *
 127  * RETURN:      Status
 128  *
 129  * DESCRIPTION: Called for AML_BREAKPOINT_OP
 130  *
 131  ******************************************************************************/
 132
 133 void acpi_db_signal_break_point(struct acpi_walk_state *walk_state)
 134 {
 135
 136 #ifndef ACPI_APPLICATION
 137         if (acpi_gbl_db_thread_id != acpi_os_get_thread_id()) {
 138                 return;
 139         }
 140 #endif
 141
 142         /*
 143          * Set the single-step flag. This will cause the debugger (if present)
 144          * to break to the console within the AML debugger at the start of the
 145          * next AML instruction.
 146          */
 147         acpi_gbl_cm_single_step = TRUE;
 148         acpi_os_printf("**break** Executed AML BreakPoint opcode\n");
 149 }
 150
 151 /*******************************************************************************
 152  *
 153  * FUNCTION:    acpi_db_single_step
 154  *
 155  * PARAMETERS:  walk_state      - Current walk
 156  *              op              - Current executing op (from aml interpreter)
 157  *              opcode_class    - Class of the current AML Opcode
 158  *
 159  * RETURN:      Status
 160  *
 161  * DESCRIPTION: Called just before execution of an AML opcode.
 162  *
 163  ******************************************************************************/
 164
 165 acpi_status
 166 acpi_db_single_step(struct acpi_walk_state *walk_state,
 167                     union acpi_parse_object *op, u32 opcode_class)
 168 {
 169         union acpi_parse_object *next;
 170         acpi_status status = AE_OK;
 171         u32 original_debug_level;
 172         union acpi_parse_object *display_op;
 173         union acpi_parse_object *parent_op;
 174         u32 aml_offset;
 175
 176         ACPI_FUNCTION_ENTRY();
 177
 178 #ifndef ACPI_APPLICATION
 179         if (acpi_gbl_db_thread_id != acpi_os_get_thread_id()) {
 180                 return (AE_OK);
 181         }
 182 #endif
 183
 184         /* Check the abort flag */
 185
 186         if (acpi_gbl_abort_method) {
 187                 acpi_gbl_abort_method = FALSE;
 188                 return (AE_ABORT_METHOD);
 189         }
 190
 191         aml_offset = (u32)ACPI_PTR_DIFF(op->common.aml,
 192                                         walk_state->parser_state.aml_start);
 193
 194         /* Check for single-step breakpoint */
 195
 196         if (walk_state->method_breakpoint &&
 197             (walk_state->method_breakpoint <= aml_offset)) {
 198
 199                 /* Check if the breakpoint has been reached or passed */
 200                 /* Hit the breakpoint, resume single step, reset breakpoint */
 201
 202                 acpi_os_printf("***Break*** at AML offset %X\n", aml_offset);
 203                 acpi_gbl_cm_single_step = TRUE;
 204                 acpi_gbl_step_to_next_call = FALSE;
 205                 walk_state->method_breakpoint = 0;
 206         }
 207
 208         /* Check for user breakpoint (Must be on exact Aml offset) */
 209
 210         else if (walk_state->user_breakpoint &&
 211                  (walk_state->user_breakpoint == aml_offset)) {
 212                 acpi_os_printf("***UserBreakpoint*** at AML offset %X\n",
 213                                aml_offset);
 214                 acpi_gbl_cm_single_step = TRUE;
 215                 acpi_gbl_step_to_next_call = FALSE;
 216                 walk_state->method_breakpoint = 0;
 217         }
 218
 219         /*
 220          * Check if this is an opcode that we are interested in --
 221          * namely, opcodes that have arguments
 222          */
 223         if (op->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
 224                 return (AE_OK);
 225         }
 226
 227         switch (opcode_class) {
 228         case AML_CLASS_UNKNOWN:
 229         case AML_CLASS_ARGUMENT:        /* constants, literals, etc. do nothing */
 230
 231                 return (AE_OK);
 232
 233         default:
 234
 235                 /* All other opcodes -- continue */
 236                 break;
 237         }
 238
 239         /*
 240          * Under certain debug conditions, display this opcode and its operands
 241          */
 242         if ((acpi_gbl_db_output_to_file) ||
 243             (acpi_gbl_cm_single_step) || (acpi_dbg_level & ACPI_LV_PARSE)) {
 244                 if ((acpi_gbl_db_output_to_file) ||
 245                     (acpi_dbg_level & ACPI_LV_PARSE)) {
 246                         acpi_os_printf
 247                             ("\n[AmlDebug] Next AML Opcode to execute:\n");
 248                 }
 249
 250                 /*
 251                  * Display this op (and only this op - zero out the NEXT field
 252                  * temporarily, and disable parser trace output for the duration of
 253                  * the display because we don't want the extraneous debug output)
 254                  */
 255                 original_debug_level = acpi_dbg_level;
 256                 acpi_dbg_level &= ~(ACPI_LV_PARSE | ACPI_LV_FUNCTIONS);
 257                 next = op->common.next;
 258                 op->common.next = NULL;
 259
 260                 display_op = op;
 261                 parent_op = op->common.parent;
 262                 if (parent_op) {
 263                         if ((walk_state->control_state) &&
 264                             (walk_state->control_state->common.state ==
 265                              ACPI_CONTROL_PREDICATE_EXECUTING)) {
 266                                 /*
 267                                  * We are executing the predicate of an IF or WHILE statement
 268                                  * Search upwards for the containing IF or WHILE so that the
 269                                  * entire predicate can be displayed.
 270                                  */
 271                                 while (parent_op) {
 272                                         if ((parent_op->common.aml_opcode ==
 273                                              AML_IF_OP)
 274                                             || (parent_op->common.aml_opcode ==
 275                                                 AML_WHILE_OP)) {
 276                                                 display_op = parent_op;
 277                                                 break;
 278                                         }
 279                                         parent_op = parent_op->common.parent;
 280                                 }
 281                         } else {
 282                                 while (parent_op) {
 283                                         if ((parent_op->common.aml_opcode ==
 284                                              AML_IF_OP)
 285                                             || (parent_op->common.aml_opcode ==
 286                                                 AML_ELSE_OP)
 287                                             || (parent_op->common.aml_opcode ==
 288                                                 AML_SCOPE_OP)
 289                                             || (parent_op->common.aml_opcode ==
 290                                                 AML_METHOD_OP)
 291                                             || (parent_op->common.aml_opcode ==
 292                                                 AML_WHILE_OP)) {
 293                                                 break;
 294                                         }
 295                                         display_op = parent_op;
 296                                         parent_op = parent_op->common.parent;
 297                                 }
 298                         }
 299                 }
 300
 301                 /* Now we can display it */
 302
 303 #ifdef ACPI_DISASSEMBLER
 304                 acpi_dm_disassemble(walk_state, display_op, ACPI_UINT32_MAX);
 305 #endif
 306
 307                 if ((op->common.aml_opcode == AML_IF_OP) ||
 308                     (op->common.aml_opcode == AML_WHILE_OP)) {
 309                         if (walk_state->control_state->common.value) {
 310                                 acpi_os_printf
 311                                     ("Predicate = [True], IF block was executed\n");
 312                         } else {
 313                                 acpi_os_printf
 314                                     ("Predicate = [False], Skipping IF block\n");
 315                         }
 316                 } else if (op->common.aml_opcode == AML_ELSE_OP) {
 317                         acpi_os_printf
 318                             ("Predicate = [False], ELSE block was executed\n");
 319                 }
 320
 321                 /* Restore everything */
 322
 323                 op->common.next = next;
 324                 acpi_os_printf("\n");
 325                 if ((acpi_gbl_db_output_to_file) ||
 326                     (acpi_dbg_level & ACPI_LV_PARSE)) {
 327                         acpi_os_printf("\n");
 328                 }
 329                 acpi_dbg_level = original_debug_level;
 330         }
 331
 332         /* If we are not single stepping, just continue executing the method */
 333
 334         if (!acpi_gbl_cm_single_step) {
 335                 return (AE_OK);
 336         }
 337
 338         /*
 339          * If we are executing a step-to-call command,
 340          * Check if this is a method call.
 341          */
 342         if (acpi_gbl_step_to_next_call) {
 343                 if (op->common.aml_opcode != AML_INT_METHODCALL_OP) {
 344
 345                         /* Not a method call, just keep executing */
 346
 347                         return (AE_OK);
 348                 }
 349
 350                 /* Found a method call, stop executing */
 351
 352                 acpi_gbl_step_to_next_call = FALSE;
 353         }
 354
 355         /*
 356          * If the next opcode is a method call, we will "step over" it
 357          * by default.
 358          */
 359         if (op->common.aml_opcode == AML_INT_METHODCALL_OP) {
 360
 361                 /* Force no more single stepping while executing called method */
 362
 363                 acpi_gbl_cm_single_step = FALSE;
 364
 365                 /*
 366                  * Set the breakpoint on/before the call, it will stop execution
 367                  * as soon as we return
 368                  */
 369                 walk_state->method_breakpoint = 1;      /* Must be non-zero! */
 370         }
 371
 372         acpi_ex_exit_interpreter();
 373         status = acpi_db_start_command(walk_state, op);
 374         acpi_ex_enter_interpreter();
 375
 376         /* User commands complete, continue execution of the interrupted method */
 377
 378         return (status);
 379 }
 380
 381 /*******************************************************************************
 382  *
 383  * FUNCTION:    acpi_initialize_debugger
 384  *
 385  * PARAMETERS:  None
 386  *
 387  * RETURN:      Status
 388  *
 389  * DESCRIPTION: Init and start debugger
 390  *
 391  ******************************************************************************/
 392
 393 acpi_status acpi_initialize_debugger(void)
 394 {
 395         acpi_status status;
 396
 397         ACPI_FUNCTION_TRACE(acpi_initialize_debugger);
 398
 399         /* Init globals */
 400
 401         acpi_gbl_db_buffer = NULL;
 402         acpi_gbl_db_filename = NULL;
 403         acpi_gbl_db_output_to_file = FALSE;
 404
 405         acpi_gbl_db_debug_level = ACPI_LV_VERBOSITY2;
 406         acpi_gbl_db_console_debug_level = ACPI_NORMAL_DEFAULT | ACPI_LV_TABLES;
 407         acpi_gbl_db_output_flags = ACPI_DB_CONSOLE_OUTPUT;
 408
 409         acpi_gbl_db_opt_no_ini_methods = FALSE;
 410
 411         acpi_gbl_db_buffer = acpi_os_allocate(ACPI_DEBUG_BUFFER_SIZE);
 412         if (!acpi_gbl_db_buffer) {
 413                 return_ACPI_STATUS(AE_NO_MEMORY);
 414         }
 415         memset(acpi_gbl_db_buffer, 0, ACPI_DEBUG_BUFFER_SIZE);
 416
 417         /* Initial scope is the root */
 418
 419         acpi_gbl_db_scope_buf[0] = AML_ROOT_PREFIX;
 420         acpi_gbl_db_scope_buf[1] = 0;
 421         acpi_gbl_db_scope_node = acpi_gbl_root_node;
 422
 423         /* Initialize user commands loop */
 424
 425         acpi_gbl_db_terminate_loop = FALSE;
 426
 427         /*
 428          * If configured for multi-thread support, the debug executor runs in
 429          * a separate thread so that the front end can be in another address
 430          * space, environment, or even another machine.
 431          */
 432         if (acpi_gbl_debugger_configuration & DEBUGGER_MULTI_THREADED) {
 433
 434                 /* These were created with one unit, grab it */
 435
 436                 status = acpi_os_initialize_debugger();
 437                 if (ACPI_FAILURE(status)) {
 438                         acpi_os_printf("Could not get debugger mutex\n");
 439                         return_ACPI_STATUS(status);
 440                 }
 441
 442                 /* Create the debug execution thread to execute commands */
 443
 444                 acpi_gbl_db_threads_terminated = FALSE;
 445                 status = acpi_os_execute(OSL_DEBUGGER_MAIN_THREAD,
 446                                          acpi_db_execute_thread, NULL);
 447                 if (ACPI_FAILURE(status)) {
 448                         ACPI_EXCEPTION((AE_INFO, status,
 449                                         "Could not start debugger thread"));
 450                         acpi_gbl_db_threads_terminated = TRUE;
 451                         return_ACPI_STATUS(status);
 452                 }
 453         } else {
 454                 acpi_gbl_db_thread_id = acpi_os_get_thread_id();
 455         }
 456
 457         return_ACPI_STATUS(AE_OK);
 458 }
 459
 460 ACPI_EXPORT_SYMBOL(acpi_initialize_debugger)
 461
 462 /*******************************************************************************
 463  *
 464  * FUNCTION:    acpi_terminate_debugger
 465  *
 466  * PARAMETERS:  None
 467  *
 468  * RETURN:      None
 469  *
 470  * DESCRIPTION: Stop debugger
 471  *
 472  ******************************************************************************/
 473 void acpi_terminate_debugger(void)
 474 {
 475
 476         /* Terminate the AML Debugger */
 477
 478         acpi_gbl_db_terminate_loop = TRUE;
 479
 480         if (acpi_gbl_debugger_configuration & DEBUGGER_MULTI_THREADED) {
 481
 482                 /* Wait the AML Debugger threads */
 483
 484                 while (!acpi_gbl_db_threads_terminated) {
 485                         acpi_os_sleep(100);
 486                 }
 487
 488                 acpi_os_terminate_debugger();
 489         }
 490
 491         if (acpi_gbl_db_buffer) {
 492                 acpi_os_free(acpi_gbl_db_buffer);
 493                 acpi_gbl_db_buffer = NULL;
 494         }
 495
 496         /* Ensure that debug output is now disabled */
 497
 498         acpi_gbl_db_output_flags = ACPI_DB_DISABLE_OUTPUT;
 499 }
 500
 501 ACPI_EXPORT_SYMBOL(acpi_terminate_debugger)
 502
 503 /*******************************************************************************
 504  *
 505  * FUNCTION:    acpi_set_debugger_thread_id
 506  *
 507  * PARAMETERS:  thread_id       - Debugger thread ID
 508  *
 509  * RETURN:      None
 510  *
 511  * DESCRIPTION: Set debugger thread ID
 512  *
 513  ******************************************************************************/
 514 void acpi_set_debugger_thread_id(acpi_thread_id thread_id)
 515 {
 516         acpi_gbl_db_thread_id = thread_id;
 517 }
 518
 519 ACPI_EXPORT_SYMBOL(acpi_set_debugger_thread_id)