target-i386/arch_dump.c

   1 /*
   2  * i386 memory mapping
   3  *
   4  * Copyright Fujitsu, Corp. 2011, 2012
   5  *
   6  * Authors:
   7  *     Wen Congyang <wency@cn.fujitsu.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "cpu.h"
  15 #include "exec/cpu-all.h"
  16 #include "sysemu/dump.h"
  17 #include "elf.h"
  18
  19 #ifdef TARGET_X86_64
  20 typedef struct {
  21     target_ulong r15, r14, r13, r12, rbp, rbx, r11, r10;
  22     target_ulong r9, r8, rax, rcx, rdx, rsi, rdi, orig_rax;
  23     target_ulong rip, cs, eflags;
  24     target_ulong rsp, ss;
  25     target_ulong fs_base, gs_base;
  26     target_ulong ds, es, fs, gs;
  27 } x86_64_user_regs_struct;
  28
  29 typedef struct {
  30     char pad1[32];
  31     uint32_t pid;
  32     char pad2[76];
  33     x86_64_user_regs_struct regs;
  34     char pad3[8];
  35 } x86_64_elf_prstatus;
  36
  37 static int x86_64_write_elf64_note(write_core_dump_function f,
  38                                    CPUArchState *env, int id,
  39                                    void *opaque)
  40 {
  41     x86_64_user_regs_struct regs;
  42     Elf64_Nhdr *note;
  43     char *buf;
  44     int descsz, note_size, name_size = 5;
  45     const char *name = "CORE";
  46     int ret;
  47
  48     regs.r15 = env->regs[15];
  49     regs.r14 = env->regs[14];
  50     regs.r13 = env->regs[13];
  51     regs.r12 = env->regs[12];
  52     regs.r11 = env->regs[11];
  53     regs.r10 = env->regs[10];
  54     regs.r9  = env->regs[9];
  55     regs.r8  = env->regs[8];
  56     regs.rbp = env->regs[R_EBP];
  57     regs.rsp = env->regs[R_ESP];
  58     regs.rdi = env->regs[R_EDI];
  59     regs.rsi = env->regs[R_ESI];
  60     regs.rdx = env->regs[R_EDX];
  61     regs.rcx = env->regs[R_ECX];
  62     regs.rbx = env->regs[R_EBX];
  63     regs.rax = env->regs[R_EAX];
  64     regs.rip = env->eip;
  65     regs.eflags = env->eflags;
  66
  67     regs.orig_rax = 0; /* FIXME */
  68     regs.cs = env->segs[R_CS].selector;
  69     regs.ss = env->segs[R_SS].selector;
  70     regs.fs_base = env->segs[R_FS].base;
  71     regs.gs_base = env->segs[R_GS].base;
  72     regs.ds = env->segs[R_DS].selector;
  73     regs.es = env->segs[R_ES].selector;
  74     regs.fs = env->segs[R_FS].selector;
  75     regs.gs = env->segs[R_GS].selector;
  76
  77     descsz = sizeof(x86_64_elf_prstatus);
  78     note_size = ((sizeof(Elf64_Nhdr) + 3) / 4 + (name_size + 3) / 4 +
  79                 (descsz + 3) / 4) * 4;
  80     note = g_malloc(note_size);
  81
  82     memset(note, 0, note_size);
  83     note->n_namesz = cpu_to_le32(name_size);
  84     note->n_descsz = cpu_to_le32(descsz);
  85     note->n_type = cpu_to_le32(NT_PRSTATUS);
  86     buf = (char *)note;
  87     buf += ((sizeof(Elf64_Nhdr) + 3) / 4) * 4;
  88     memcpy(buf, name, name_size);
  89     buf += ((name_size + 3) / 4) * 4;
  90     memcpy(buf + 32, &id, 4); /* pr_pid */
  91     buf += descsz - sizeof(x86_64_user_regs_struct)-sizeof(target_ulong);
  92     memcpy(buf, &regs, sizeof(x86_64_user_regs_struct));
  93
  94     ret = f(note, note_size, opaque);
  95     g_free(note);
  96     if (ret < 0) {
  97         return -1;
  98     }
  99
 100     return 0;
 101 }
 102 #endif
 103
 104 typedef struct {
 105     uint32_t ebx, ecx, edx, esi, edi, ebp, eax;
 106     unsigned short ds, __ds, es, __es;
 107     unsigned short fs, __fs, gs, __gs;
 108     uint32_t orig_eax, eip;
 109     unsigned short cs, __cs;
 110     uint32_t eflags, esp;
 111     unsigned short ss, __ss;
 112 } x86_user_regs_struct;
 113
 114 typedef struct {
 115     char pad1[24];
 116     uint32_t pid;
 117     char pad2[44];
 118     x86_user_regs_struct regs;
 119     char pad3[4];
 120 } x86_elf_prstatus;
 121
 122 static void x86_fill_elf_prstatus(x86_elf_prstatus *prstatus, CPUArchState *env,
 123                                   int id)
 124 {
 125     memset(prstatus, 0, sizeof(x86_elf_prstatus));
 126     prstatus->regs.ebp = env->regs[R_EBP] & 0xffffffff;
 127     prstatus->regs.esp = env->regs[R_ESP] & 0xffffffff;
 128     prstatus->regs.edi = env->regs[R_EDI] & 0xffffffff;
 129     prstatus->regs.esi = env->regs[R_ESI] & 0xffffffff;
 130     prstatus->regs.edx = env->regs[R_EDX] & 0xffffffff;
 131     prstatus->regs.ecx = env->regs[R_ECX] & 0xffffffff;
 132     prstatus->regs.ebx = env->regs[R_EBX] & 0xffffffff;
 133     prstatus->regs.eax = env->regs[R_EAX] & 0xffffffff;
 134     prstatus->regs.eip = env->eip & 0xffffffff;
 135     prstatus->regs.eflags = env->eflags & 0xffffffff;
 136
 137     prstatus->regs.cs = env->segs[R_CS].selector;
 138     prstatus->regs.ss = env->segs[R_SS].selector;
 139     prstatus->regs.ds = env->segs[R_DS].selector;
 140     prstatus->regs.es = env->segs[R_ES].selector;
 141     prstatus->regs.fs = env->segs[R_FS].selector;
 142     prstatus->regs.gs = env->segs[R_GS].selector;
 143
 144     prstatus->pid = id;
 145 }
 146
 147 static int x86_write_elf64_note(write_core_dump_function f, CPUArchState *env,
 148                                 int id, void *opaque)
 149 {
 150     x86_elf_prstatus prstatus;
 151     Elf64_Nhdr *note;
 152     char *buf;
 153     int descsz, note_size, name_size = 5;
 154     const char *name = "CORE";
 155     int ret;
 156
 157     x86_fill_elf_prstatus(&prstatus, env, id);
 158     descsz = sizeof(x86_elf_prstatus);
 159     note_size = ((sizeof(Elf64_Nhdr) + 3) / 4 + (name_size + 3) / 4 +
 160                 (descsz + 3) / 4) * 4;
 161     note = g_malloc(note_size);
 162
 163     memset(note, 0, note_size);
 164     note->n_namesz = cpu_to_le32(name_size);
 165     note->n_descsz = cpu_to_le32(descsz);
 166     note->n_type = cpu_to_le32(NT_PRSTATUS);
 167     buf = (char *)note;
 168     buf += ((sizeof(Elf64_Nhdr) + 3) / 4) * 4;
 169     memcpy(buf, name, name_size);
 170     buf += ((name_size + 3) / 4) * 4;
 171     memcpy(buf, &prstatus, sizeof(prstatus));
 172
 173     ret = f(note, note_size, opaque);
 174     g_free(note);
 175     if (ret < 0) {
 176         return -1;
 177     }
 178
 179     return 0;
 180 }
 181
 182 int cpu_write_elf64_note(write_core_dump_function f, CPUArchState *env,
 183                          int cpuid, void *opaque)
 184 {
 185     int ret;
 186 #ifdef TARGET_X86_64
 187     bool lma = !!(first_cpu->hflags & HF_LMA_MASK);
 188
 189     if (lma) {
 190         ret = x86_64_write_elf64_note(f, env, cpuid, opaque);
 191     } else {
 192 #endif
 193         ret = x86_write_elf64_note(f, env, cpuid, opaque);
 194 #ifdef TARGET_X86_64
 195     }
 196 #endif
 197
 198     return ret;
 199 }
 200
 201 int cpu_write_elf32_note(write_core_dump_function f, CPUArchState *env,
 202                          int cpuid, void *opaque)
 203 {
 204     x86_elf_prstatus prstatus;
 205     Elf32_Nhdr *note;
 206     char *buf;
 207     int descsz, note_size, name_size = 5;
 208     const char *name = "CORE";
 209     int ret;
 210
 211     x86_fill_elf_prstatus(&prstatus, env, cpuid);
 212     descsz = sizeof(x86_elf_prstatus);
 213     note_size = ((sizeof(Elf32_Nhdr) + 3) / 4 + (name_size + 3) / 4 +
 214                 (descsz + 3) / 4) * 4;
 215     note = g_malloc(note_size);
 216
 217     memset(note, 0, note_size);
 218     note->n_namesz = cpu_to_le32(name_size);
 219     note->n_descsz = cpu_to_le32(descsz);
 220     note->n_type = cpu_to_le32(NT_PRSTATUS);
 221     buf = (char *)note;
 222     buf += ((sizeof(Elf32_Nhdr) + 3) / 4) * 4;
 223     memcpy(buf, name, name_size);
 224     buf += ((name_size + 3) / 4) * 4;
 225     memcpy(buf, &prstatus, sizeof(prstatus));
 226
 227     ret = f(note, note_size, opaque);
 228     g_free(note);
 229     if (ret < 0) {
 230         return -1;
 231     }
 232
 233     return 0;
 234 }
 235
 236 /*
 237  * please count up QEMUCPUSTATE_VERSION if you have changed definition of
 238  * QEMUCPUState, and modify the tools using this information accordingly.
 239  */
 240 #define QEMUCPUSTATE_VERSION (1)
 241
 242 struct QEMUCPUSegment {
 243     uint32_t selector;
 244     uint32_t limit;
 245     uint32_t flags;
 246     uint32_t pad;
 247     uint64_t base;
 248 };
 249
 250 typedef struct QEMUCPUSegment QEMUCPUSegment;
 251
 252 struct QEMUCPUState {
 253     uint32_t version;
 254     uint32_t size;
 255     uint64_t rax, rbx, rcx, rdx, rsi, rdi, rsp, rbp;
 256     uint64_t r8, r9, r10, r11, r12, r13, r14, r15;
 257     uint64_t rip, rflags;
 258     QEMUCPUSegment cs, ds, es, fs, gs, ss;
 259     QEMUCPUSegment ldt, tr, gdt, idt;
 260     uint64_t cr[5];
 261 };
 262
 263 typedef struct QEMUCPUState QEMUCPUState;
 264
 265 static void copy_segment(QEMUCPUSegment *d, SegmentCache *s)
 266 {
 267     d->pad = 0;
 268     d->selector = s->selector;
 269     d->limit = s->limit;
 270     d->flags = s->flags;
 271     d->base = s->base;
 272 }
 273
 274 static void qemu_get_cpustate(QEMUCPUState *s, CPUArchState *env)
 275 {
 276     memset(s, 0, sizeof(QEMUCPUState));
 277
 278     s->version = QEMUCPUSTATE_VERSION;
 279     s->size = sizeof(QEMUCPUState);
 280
 281     s->rax = env->regs[R_EAX];
 282     s->rbx = env->regs[R_EBX];
 283     s->rcx = env->regs[R_ECX];
 284     s->rdx = env->regs[R_EDX];
 285     s->rsi = env->regs[R_ESI];
 286     s->rdi = env->regs[R_EDI];
 287     s->rsp = env->regs[R_ESP];
 288     s->rbp = env->regs[R_EBP];
 289 #ifdef TARGET_X86_64
 290     s->r8  = env->regs[8];
 291     s->r9  = env->regs[9];
 292     s->r10 = env->regs[10];
 293     s->r11 = env->regs[11];
 294     s->r12 = env->regs[12];
 295     s->r13 = env->regs[13];
 296     s->r14 = env->regs[14];
 297     s->r15 = env->regs[15];
 298 #endif
 299     s->rip = env->eip;
 300     s->rflags = env->eflags;
 301
 302     copy_segment(&s->cs, &env->segs[R_CS]);
 303     copy_segment(&s->ds, &env->segs[R_DS]);
 304     copy_segment(&s->es, &env->segs[R_ES]);
 305     copy_segment(&s->fs, &env->segs[R_FS]);
 306     copy_segment(&s->gs, &env->segs[R_GS]);
 307     copy_segment(&s->ss, &env->segs[R_SS]);
 308     copy_segment(&s->ldt, &env->ldt);
 309     copy_segment(&s->tr, &env->tr);
 310     copy_segment(&s->gdt, &env->gdt);
 311     copy_segment(&s->idt, &env->idt);
 312
 313     s->cr[0] = env->cr[0];
 314     s->cr[1] = env->cr[1];
 315     s->cr[2] = env->cr[2];
 316     s->cr[3] = env->cr[3];
 317     s->cr[4] = env->cr[4];
 318 }
 319
 320 static inline int cpu_write_qemu_note(write_core_dump_function f,
 321                                       CPUArchState *env,
 322                                       void *opaque,
 323                                       int type)
 324 {
 325     QEMUCPUState state;
 326     Elf64_Nhdr *note64;
 327     Elf32_Nhdr *note32;
 328     void *note;
 329     char *buf;
 330     int descsz, note_size, name_size = 5, note_head_size;
 331     const char *name = "QEMU";
 332     int ret;
 333
 334     qemu_get_cpustate(&state, env);
 335
 336     descsz = sizeof(state);
 337     if (type == 0) {
 338         note_head_size = sizeof(Elf32_Nhdr);
 339     } else {
 340         note_head_size = sizeof(Elf64_Nhdr);
 341     }
 342     note_size = ((note_head_size + 3) / 4 + (name_size + 3) / 4 +
 343                 (descsz + 3) / 4) * 4;
 344     note = g_malloc(note_size);
 345
 346     memset(note, 0, note_size);
 347     if (type == 0) {
 348         note32 = note;
 349         note32->n_namesz = cpu_to_le32(name_size);
 350         note32->n_descsz = cpu_to_le32(descsz);
 351         note32->n_type = 0;
 352     } else {
 353         note64 = note;
 354         note64->n_namesz = cpu_to_le32(name_size);
 355         note64->n_descsz = cpu_to_le32(descsz);
 356         note64->n_type = 0;
 357     }
 358     buf = note;
 359     buf += ((note_head_size + 3) / 4) * 4;
 360     memcpy(buf, name, name_size);
 361     buf += ((name_size + 3) / 4) * 4;
 362     memcpy(buf, &state, sizeof(state));
 363
 364     ret = f(note, note_size, opaque);
 365     g_free(note);
 366     if (ret < 0) {
 367         return -1;
 368     }
 369
 370     return 0;
 371 }
 372
 373 int cpu_write_elf64_qemunote(write_core_dump_function f, CPUArchState *env,
 374                              void *opaque)
 375 {
 376     return cpu_write_qemu_note(f, env, opaque, 1);
 377 }
 378
 379 int cpu_write_elf32_qemunote(write_core_dump_function f, CPUArchState *env,
 380                              void *opaque)
 381 {
 382     return cpu_write_qemu_note(f, env, opaque, 0);
 383 }
 384
 385 int cpu_get_dump_info(ArchDumpInfo *info)
 386 {
 387     bool lma = false;
 388     RAMBlock *block;
 389
 390 #ifdef TARGET_X86_64
 391     lma = !!(first_cpu->hflags & HF_LMA_MASK);
 392 #endif
 393
 394     if (lma) {
 395         info->d_machine = EM_X86_64;
 396     } else {
 397         info->d_machine = EM_386;
 398     }
 399     info->d_endian = ELFDATA2LSB;
 400
 401     if (lma) {
 402         info->d_class = ELFCLASS64;
 403     } else {
 404         info->d_class = ELFCLASS32;
 405
 406         QTAILQ_FOREACH(block, &ram_list.blocks, next) {
 407             if (block->offset + block->length > UINT_MAX) {
 408                 /* The memory size is greater than 4G */
 409                 info->d_class = ELFCLASS64;
 410                 break;
 411             }
 412         }
 413     }
 414
 415     return 0;
 416 }
 417
 418 ssize_t cpu_get_note_size(int class, int machine, int nr_cpus)
 419 {
 420     int name_size = 5; /* "CORE" or "QEMU" */
 421     size_t elf_note_size = 0;
 422     size_t qemu_note_size = 0;
 423     int elf_desc_size = 0;
 424     int qemu_desc_size = 0;
 425     int note_head_size;
 426
 427     if (class == ELFCLASS32) {
 428         note_head_size = sizeof(Elf32_Nhdr);
 429     } else {
 430         note_head_size = sizeof(Elf64_Nhdr);
 431     }
 432
 433     if (machine == EM_386) {
 434         elf_desc_size = sizeof(x86_elf_prstatus);
 435     }
 436 #ifdef TARGET_X86_64
 437     else {
 438         elf_desc_size = sizeof(x86_64_elf_prstatus);
 439     }
 440 #endif
 441     qemu_desc_size = sizeof(QEMUCPUState);
 442
 443     elf_note_size = ((note_head_size + 3) / 4 + (name_size + 3) / 4 +
 444                      (elf_desc_size + 3) / 4) * 4;
 445     qemu_note_size = ((note_head_size + 3) / 4 + (name_size + 3) / 4 +
 446                       (qemu_desc_size + 3) / 4) * 4;
 447
 448     return (elf_note_size + qemu_note_size) * nr_cpus;
 449 }