palacios/src/palacios/vmm_debug.c

   1 /*
   2  * This file is part of the Palacios Virtual Machine Monitor developed
   3  * by the V3VEE Project with funding from the United States National
   4  * Science Foundation and the Department of Energy.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
  11  * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
  12  * All rights reserved.
  13  *
  14  * Author: Jack Lange <jarusl@cs.northwestern.edu>
  15  *
  16  * This is free software.  You are permitted to use,
  17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  18  */
  19
  20
  21 #include <palacios/vmm_debug.h>
  22 #include <palacios/vmm.h>
  23 #include <palacios/vmm_host_events.h>
  24 #include <palacios/vm_guest.h>
  25 #include <palacios/vmm_decoder.h>
  26 #include <palacios/vm_guest_mem.h>
  27 #include <palacios/vmm_config.h>
  28
  29 #define PRINT_TELEMETRY  1
  30 #define PRINT_CORE_STATE 2
  31 #define PRINT_ARCH_STATE 3
  32 #define PRINT_STACK      4
  33 #define PRINT_BACKTRACE  5
  34
  35
  36 #define PRINT_ALL        100 // Absolutely everything
  37 #define PRINT_STATE      101 // telemetry, core state, arch state
  38
  39
  40
  41
  42 static int core_handler(struct guest_info * core, uint32_t cmd) {
  43
  44
  45     switch (cmd) {
  46 #ifdef V3_CONFIG_TELEMETRY
  47         case PRINT_TELEMETRY:
  48             v3_print_core_telemetry(core);
  49             break;
  50 #endif
  51
  52         case PRINT_CORE_STATE:
  53             v3_raise_barrier(core->vm_info, NULL);
  54
  55             v3_print_guest_state(core);
  56
  57             v3_lower_barrier(core->vm_info);
  58             break;
  59         case PRINT_ARCH_STATE:
  60             v3_raise_barrier(core->vm_info, NULL);
  61
  62             v3_print_arch_state(core);
  63
  64             v3_lower_barrier(core->vm_info);
  65             break;
  66         case PRINT_STACK:
  67             v3_raise_barrier(core->vm_info, NULL);
  68
  69             v3_print_stack(core);
  70
  71             v3_lower_barrier(core->vm_info);
  72             break;
  73         case PRINT_BACKTRACE:
  74             v3_raise_barrier(core->vm_info, NULL);
  75
  76             v3_print_backtrace(core);
  77
  78             v3_lower_barrier(core->vm_info);
  79             break;
  80
  81         case PRINT_STATE:
  82             v3_raise_barrier(core->vm_info, NULL);
  83
  84 #ifdef V3_CONFIG_TELEMETRY
  85             v3_print_core_telemetry(core);
  86 #endif
  87             v3_print_guest_state(core);
  88             v3_print_arch_state(core);
  89
  90             v3_lower_barrier(core->vm_info);
  91             break;
  92
  93         case PRINT_ALL:
  94             v3_raise_barrier(core->vm_info, NULL);
  95
  96 #ifdef V3_CONFIG_TELEMETRY
  97             v3_print_core_telemetry(core);
  98 #endif
  99             v3_print_guest_state(core);
 100             v3_print_arch_state(core);
 101         v3_print_stack(core);
 102         v3_print_backtrace(core);
 103
 104             v3_lower_barrier(core->vm_info);
 105             break;
 106
 107     }
 108
 109     return 0;
 110 }
 111
 112
 113 static int evt_handler(struct v3_vm_info * vm, struct v3_debug_event * evt, void * priv_data) {
 114
 115     V3_Print(vm, VCORE_NONE,"Debug Event Handler for core %d cmd=%x\n", evt->core_id, evt->cmd);
 116
 117     if (evt->core_id == -1) {
 118         int i = 0;
 119         for (i = 0; i < vm->num_cores; i++) {
 120             core_handler(&(vm->cores[i]), evt->cmd);
 121         }
 122     } else {
 123         return core_handler(&vm->cores[evt->core_id], evt->cmd);
 124     }
 125
 126
 127     return 0;
 128 }
 129
 130
 131 int v3_init_vm_debugging(struct v3_vm_info * vm) {
 132     v3_hook_host_event(vm, HOST_DEBUG_EVT,
 133                        V3_HOST_EVENT_HANDLER(evt_handler),
 134                        NULL);
 135
 136
 137     return 0;
 138 }
 139
 140
 141
 142
 143
 144 void v3_print_segments(struct v3_segments * segs) {
 145     int i = 0;
 146     struct v3_segment * seg_ptr;
 147
 148     seg_ptr=(struct v3_segment *)segs;
 149
 150     char *seg_names[] = {"CS", "DS" , "ES", "FS", "GS", "SS" , "LDTR", "GDTR", "IDTR", "TR", NULL};
 151     V3_Print(VM_NONE, VCORE_NONE, "Segments\n");
 152
 153     for (i = 0; seg_names[i] != NULL; i++) {
 154
 155         V3_Print(VM_NONE, VCORE_NONE, "\t%s: Sel=%x, base=%p, limit=%x (long_mode=%d, db=%d)\n", seg_names[i], seg_ptr[i].selector,
 156                    (void *)(addr_t)seg_ptr[i].base, seg_ptr[i].limit,
 157                    seg_ptr[i].long_mode, seg_ptr[i].db);
 158
 159     }
 160 }
 161
 162
 163
 164 void v3_print_ctrl_regs(struct guest_info * core) {
 165     struct v3_ctrl_regs * regs = &(core->ctrl_regs);
 166     int i = 0;
 167     v3_reg_t * reg_ptr;
 168     char * reg_names[] = {"CR0", "CR2", "CR3", "CR4", "CR8", "FLAGS", "EFER", NULL};
 169
 170
 171     reg_ptr = (v3_reg_t *)regs;
 172
 173     V3_Print(core->vm_info, core,"Ctrl Regs:\n");
 174
 175     for (i = 0; reg_names[i] != NULL; i++) {
 176         V3_Print(core->vm_info, core, "\t%s=0x%p (at %p)\n", reg_names[i], (void *)(addr_t)reg_ptr[i], &(reg_ptr[i]));
 177     }
 178
 179
 180 }
 181
 182 #if 0
 183 static int safe_gva_to_hva(struct guest_info * core, addr_t linear_addr, addr_t * host_addr) {
 184     /* select the proper translation based on guest mode */
 185     if (core->mem_mode == PHYSICAL_MEM) {
 186         if (v3_gpa_to_hva(core, linear_addr, host_addr) == -1) return -1;
 187     } else if (core->mem_mode == VIRTUAL_MEM) {
 188         if (v3_gva_to_hva(core, linear_addr, host_addr) == -1) return -1;
 189     }
 190     return 0;
 191 }
 192
 193 static int v3_print_disassembly(struct guest_info * core) {
 194     int passed_rip = 0;
 195     addr_t rip, rip_linear, rip_host;
 196
 197     /* we don't know where the instructions preceding RIP start, so we just take
 198      * a guess and hope the instruction stream synced up with our disassembly
 199      * some time before RIP; if it has not we correct RIP at that point
 200      */
 201
 202     /* start disassembly 64 bytes before current RIP, continue 32 bytes after */
 203     rip = (addr_t) core->rip - 64;
 204     while ((int) (rip - core->rip) < 32) {
 205         V3_Print(info->vm_info, info, "disassembly step\n");
 206
 207         /* always print RIP, even if the instructions before were bad */
 208         if (!passed_rip && rip >= core->rip) {
 209             if (rip != core->rip) {
 210                 V3_Print(info->vm_info, info, "***** bad disassembly up to this point *****\n");
 211                 rip = core->rip;
 212             }
 213             passed_rip = 1;
 214         }
 215
 216         /* look up host virtual address for this instruction */
 217         rip_linear = get_addr_linear(core, rip, &(core->segments.cs));
 218         if (safe_gva_to_hva(core, rip_linear, &rip_host) < 0) {
 219             rip++;
 220             continue;
 221         }
 222
 223         /* print disassembled instrcution (updates rip) */
 224         if (v3_disasm(core, (void *) rip_host, &rip, rip == core->rip) < 0) {
 225             rip++;
 226             continue;
 227         }
 228
 229     }
 230
 231     return 0;
 232 }
 233
 234 #endif
 235
 236 void v3_print_guest_state(struct guest_info * core) {
 237     addr_t linear_addr = 0;
 238
 239     V3_Print(core->vm_info, core, "RIP: %p\n", (void *)(addr_t)(core->rip));
 240     linear_addr = get_addr_linear(core, core->rip, &(core->segments.cs));
 241     V3_Print(core->vm_info, core, "RIP Linear: %p\n", (void *)linear_addr);
 242
 243     V3_Print(core->vm_info, core, "NumExits: %u\n", (uint32_t)core->num_exits);
 244
 245     V3_Print(core->vm_info, core, "IRQ STATE: started=%d, pending=%d\n",
 246              core->intr_core_state.irq_started,
 247              core->intr_core_state.irq_pending);
 248     V3_Print(core->vm_info, core, "EXCP STATE: err_code_valid=%d, err_code=%x\n",
 249              core->excp_state.excp_error_code_valid,
 250              core->excp_state.excp_error_code);
 251
 252
 253     v3_print_segments(&(core->segments));
 254     v3_print_ctrl_regs(core);
 255
 256     if (core->shdw_pg_mode == SHADOW_PAGING) {
 257         V3_Print(core->vm_info, core, "Shadow Paging Guest Registers:\n");
 258         V3_Print(core->vm_info, core, "\tGuest CR0=%p\n", (void *)(addr_t)(core->shdw_pg_state.guest_cr0));
 259         V3_Print(core->vm_info, core, "\tGuest CR3=%p\n", (void *)(addr_t)(core->shdw_pg_state.guest_cr3));
 260         V3_Print(core->vm_info, core, "\tGuest EFER=%p\n", (void *)(addr_t)(core->shdw_pg_state.guest_efer.value));
 261         // CR4
 262     }
 263     v3_print_GPRs(core);
 264
 265     v3_print_mem_map(core->vm_info);
 266
 267     v3_print_stack(core);
 268
 269     //  v3_print_disassembly(core);
 270 }
 271
 272
 273 void v3_print_arch_state(struct guest_info * core) {
 274
 275
 276 }
 277
 278
 279 void v3_print_guest_state_all(struct v3_vm_info * vm) {
 280     int i = 0;
 281
 282     V3_Print(vm, VCORE_NONE,"VM Core states for %s\n", vm->name);
 283
 284     for (i = 0; i < 80; i++) {
 285       V3_Print(vm, VCORE_NONE, "-");
 286     }
 287
 288     for (i = 0; i < vm->num_cores; i++) {
 289         v3_print_guest_state(&vm->cores[i]);
 290     }
 291
 292     for (i = 0; i < 80; i++) {
 293         V3_Print(vm, VCORE_NONE, "-");
 294     }
 295
 296     V3_Print(vm, VCORE_NONE, "\n");
 297 }
 298
 299
 300
 301 void v3_print_stack(struct guest_info * core) {
 302     addr_t linear_addr = 0;
 303     addr_t host_addr = 0;
 304     int i = 0;
 305     v3_cpu_mode_t cpu_mode = v3_get_vm_cpu_mode(core);
 306
 307     linear_addr = get_addr_linear(core, core->vm_regs.rsp, &(core->segments.ss));
 308
 309     V3_Print(core->vm_info, core, "Stack at %p:\n", (void *)linear_addr);
 310
 311     if (core->mem_mode == PHYSICAL_MEM) {
 312         if (v3_gpa_to_hva(core, linear_addr, &host_addr) == -1) {
 313             PrintError(core->vm_info, core, "Could not translate Stack address\n");
 314             return;
 315         }
 316     } else if (core->mem_mode == VIRTUAL_MEM) {
 317         if (v3_gva_to_hva(core, linear_addr, &host_addr) == -1) {
 318             PrintError(core->vm_info, core, "Could not translate Virtual Stack address\n");
 319             return;
 320         }
 321     }
 322
 323     V3_Print(core->vm_info, core, "Host Address of rsp = 0x%p\n", (void *)host_addr);
 324
 325     // We start i at one because the current stack pointer points to an unused stack element
 326     for (i = 0; i <= 24; i++) {
 327
 328         if (cpu_mode == REAL) {
 329             V3_Print(core->vm_info, core, "\t0x%.4x\n", *((uint16_t *)host_addr + (i * 2)));
 330         } else if (cpu_mode == LONG) {
 331             V3_Print(core->vm_info, core, "\t%p\n", (void *)*(addr_t *)(host_addr + (i * 8)));
 332         } else {
 333             // 32 bit stacks...
 334             V3_Print(core->vm_info, core, "\t0x%.8x\n", *(uint32_t *)(host_addr + (i * 4)));
 335         }
 336     }
 337
 338 }
 339
 340
 341 void v3_print_backtrace(struct guest_info * core) {
 342     addr_t gla_rbp = 0;
 343     int i = 0;
 344     v3_cpu_mode_t cpu_mode = v3_get_vm_cpu_mode(core);
 345     struct v3_cfg_file * system_map = v3_cfg_get_file(core->vm_info, "System.map");
 346
 347     V3_Print(core->vm_info, core, "Performing Backtrace for Core %d\n", core->vcpu_id);
 348     V3_Print(core->vm_info, core, "\tRSP=%p, RBP=%p\n", (void *)core->vm_regs.rsp, (void *)core->vm_regs.rbp);
 349
 350     gla_rbp = get_addr_linear(core, core->vm_regs.rbp, &(core->segments.ss));
 351
 352
 353     for (i = 0; i < 30; i++) {
 354         addr_t hva_rbp = 0;
 355         addr_t hva_rip = 0;
 356         char * sym_name = NULL;
 357         addr_t rip_val = 0;
 358
 359         if (core->mem_mode == PHYSICAL_MEM) {
 360             if (v3_gpa_to_hva(core, gla_rbp, &hva_rbp) == -1) {
 361                 PrintError(core->vm_info, core, "Could not translate Stack address\n");
 362                 return;
 363             }
 364         } else if (core->mem_mode == VIRTUAL_MEM) {
 365             if (v3_gva_to_hva(core, gla_rbp, &hva_rbp) == -1) {
 366                 PrintError(core->vm_info, core, "Could not translate Virtual Stack address\n");
 367                 return;
 368             }
 369         }
 370
 371
 372         hva_rip = hva_rbp + v3_get_addr_width(core);
 373
 374         if (cpu_mode == REAL) {
 375             rip_val = (addr_t)*(uint16_t *)hva_rip;
 376         } else if (cpu_mode == LONG) {
 377             rip_val = (addr_t)*(uint64_t *)hva_rip;
 378         } else {
 379             rip_val = (addr_t)*(uint32_t *)hva_rip;
 380         }
 381
 382         if (system_map) {
 383             char * tmp_ptr = system_map->data;
 384             char * sym_ptr = NULL;
 385             uint64_t file_offset = 0;
 386             uint64_t sym_offset = 0;
 387
 388             while (file_offset < system_map->size) {
 389                 sym_offset = strtox(tmp_ptr, &tmp_ptr);
 390
 391                 tmp_ptr += 3; // pass over symbol type
 392
 393                 if (sym_offset > rip_val) {
 394                     char * end_ptr = strchr(sym_ptr, '\n');
 395
 396                     if (end_ptr) {
 397                         *end_ptr = 0; // null terminate symbol...
 398                     }
 399
 400                     sym_name = sym_ptr;
 401                     break;
 402                 }
 403
 404                 sym_ptr = tmp_ptr;
 405                 {
 406                     char * end_ptr2 = strchr(tmp_ptr, '\n');
 407
 408                     if (!end_ptr2) {
 409                         tmp_ptr += strlen(tmp_ptr) + 1;
 410                     } else {
 411                         tmp_ptr = end_ptr2 + 1;
 412                     }
 413                 }
 414             }
 415         }
 416
 417         if (!sym_name) {
 418             sym_name = "?";
 419         }
 420
 421         if (cpu_mode == REAL) {
 422             V3_Print(core->vm_info, core, "Next RBP=0x%.4x, RIP=0x%.4x (%s)\n",
 423                      *(uint16_t *)hva_rbp,*(uint16_t *)hva_rip,
 424                      sym_name);
 425
 426             gla_rbp = *(uint16_t *)hva_rbp;
 427         } else if (cpu_mode == LONG) {
 428             V3_Print(core->vm_info, core, "Next RBP=%p, RIP=%p (%s)\n",
 429                      (void *)*(uint64_t *)hva_rbp, (void *)*(uint64_t *)hva_rip,
 430                      sym_name);
 431             gla_rbp = *(uint64_t *)hva_rbp;
 432         } else {
 433             V3_Print(core->vm_info, core, "Next RBP=0x%.8x, RIP=0x%.8x (%s)\n",
 434                      *(uint32_t *)hva_rbp, *(uint32_t *)hva_rip,
 435                      sym_name);
 436             gla_rbp = *(uint32_t *)hva_rbp;
 437         }
 438
 439     }
 440 }
 441
 442
 443 #ifdef __V3_32BIT__
 444
 445 void v3_print_GPRs(struct guest_info * core) {
 446     struct v3_gprs * regs = &(core->vm_regs);
 447     int i = 0;
 448     v3_reg_t * reg_ptr;
 449     char * reg_names[] = { "RDI", "RSI", "RBP", "RSP", "RBX", "RDX", "RCX", "RAX", NULL};
 450
 451     reg_ptr = (v3_reg_t *)regs;
 452
 453     V3_Print(info->vm_info, info, "32 bit GPRs:\n");
 454
 455     for (i = 0; reg_names[i] != NULL; i++) {
 456         V3_Print(info->vm_info, info, "\t%s=0x%p (at %p)\n", reg_names[i], (void *)(addr_t)reg_ptr[i], &(reg_ptr[i]));
 457     }
 458 }
 459
 460 #elif __V3_64BIT__
 461
 462 void v3_print_GPRs(struct guest_info * core) {
 463     struct v3_gprs * regs = &(core->vm_regs);
 464     int i = 0;
 465     v3_reg_t * reg_ptr;
 466     char * reg_names[] = { "RDI", "RSI", "RBP", "RSP", "RBX", "RDX", "RCX", "RAX", \
 467                            "R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15", NULL};
 468
 469     reg_ptr = (v3_reg_t *)regs;
 470
 471     V3_Print(core->vm_info, core, "64 bit GPRs:\n");
 472
 473     for (i = 0; reg_names[i] != NULL; i++) {
 474         V3_Print(core->vm_info, core, "\t%s=0x%p (at %p)\n", reg_names[i], (void *)(addr_t)reg_ptr[i], &(reg_ptr[i]));
 475     }
 476 }
 477
 478 #endif