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 #include "sysemu/memory_mapping.h"
  19
  20 #ifdef TARGET_X86_64
  21 typedef struct {
  22     target_ulong r15, r14, r13, r12, rbp, rbx, r11, r10;
  23     target_ulong r9, r8, rax, rcx, rdx, rsi, rdi, orig_rax;
  24     target_ulong rip, cs, eflags;
  25     target_ulong rsp, ss;
  26     target_ulong fs_base, gs_base;
  27     target_ulong ds, es, fs, gs;
  28 } x86_64_user_regs_struct;
  29
  30 typedef struct {
  31     char pad1[32];
  32     uint32_t pid;
  33     char pad2[76];
  34     x86_64_user_regs_struct regs;
  35     char pad3[8];
  36 } x86_64_elf_prstatus;
  37
  38 static int x86_64_write_elf64_note(WriteCoreDumpFunction f,
  39                                    CPUX86State *env, int id,
  40                                    void *opaque)
  41 {
  42     x86_64_user_regs_struct regs;
  43     Elf64_Nhdr *note;
  44     char *buf;
  45     int descsz, note_size, name_size = 5;
  46     const char *name = "CORE";
  47     int ret;
  48
  49     regs.r15 = env->regs[15];
  50     regs.r14 = env->regs[14];
  51     regs.r13 = env->regs[13];
  52     regs.r12 = env->regs[12];
  53     regs.r11 = env->regs[11];
  54     regs.r10 = env->regs[10];
  55     regs.r9  = env->regs[9];
  56     regs.r8  = env->regs[8];
  57     regs.rbp = env->regs[R_EBP];
  58     regs.rsp = env->regs[R_ESP];
  59     regs.rdi = env->regs[R_EDI];
  60     regs.rsi = env->regs[R_ESI];
  61     regs.rdx = env->regs[R_EDX];
  62     regs.rcx = env->regs[R_ECX];
  63     regs.rbx = env->regs[R_EBX];
  64     regs.rax = env->regs[R_EAX];
  65     regs.rip = env->eip;
  66     regs.eflags = env->eflags;
  67
  68     regs.orig_rax = 0; /* FIXME */
  69     regs.cs = env->segs[R_CS].selector;
  70     regs.ss = env->segs[R_SS].selector;
  71     regs.fs_base = env->segs[R_FS].base;
  72     regs.gs_base = env->segs[R_GS].base;
  73     regs.ds = env->segs[R_DS].selector;
  74     regs.es = env->segs[R_ES].selector;
  75     regs.fs = env->segs[R_FS].selector;
  76     regs.gs = env->segs[R_GS].selector;
  77
  78     descsz = sizeof(x86_64_elf_prstatus);
  79     note_size = ((sizeof(Elf64_Nhdr) + 3) / 4 + (name_size + 3) / 4 +
  80                 (descsz + 3) / 4) * 4;
  81     note = g_malloc0(note_size);
  82     note->n_namesz = cpu_to_le32(name_size);
  83     note->n_descsz = cpu_to_le32(descsz);
  84     note->n_type = cpu_to_le32(NT_PRSTATUS);
  85     buf = (char *)note;
  86     buf += ((sizeof(Elf64_Nhdr) + 3) / 4) * 4;
  87     memcpy(buf, name, name_size);
  88     buf += ((name_size + 3) / 4) * 4;
  89     memcpy(buf + 32, &id, 4); /* pr_pid */
  90     buf += descsz - sizeof(x86_64_user_regs_struct)-sizeof(target_ulong);
  91     memcpy(buf, &regs, sizeof(x86_64_user_regs_struct));
  92
  93     ret = f(note, note_size, opaque);
  94     g_free(note);
  95     if (ret < 0) {
  96         return -1;
  97     }
  98
  99     return 0;
 100 }
 101 #endif
 102
 103 typedef struct {
 104     uint32_t ebx, ecx, edx, esi, edi, ebp, eax;
 105     unsigned short ds, __ds, es, __es;
 106     unsigned short fs, __fs, gs, __gs;
 107     uint32_t orig_eax, eip;
 108     unsigned short cs, __cs;
 109     uint32_t eflags, esp;
 110     unsigned short ss, __ss;
 111 } x86_user_regs_struct;
 112
 113 typedef struct {
 114     char pad1[24];
 115     uint32_t pid;
 116     char pad2[44];
 117     x86_user_regs_struct regs;
 118     char pad3[4];
 119 } x86_elf_prstatus;
 120
 121 static void x86_fill_elf_prstatus(x86_elf_prstatus *prstatus, CPUX86State *env,
 122                                   int id)
 123 {
 124     memset(prstatus, 0, sizeof(x86_elf_prstatus));
 125     prstatus->regs.ebp = env->regs[R_EBP] & 0xffffffff;
 126     prstatus->regs.esp = env->regs[R_ESP] & 0xffffffff;
 127     prstatus->regs.edi = env->regs[R_EDI] & 0xffffffff;
 128     prstatus->regs.esi = env->regs[R_ESI] & 0xffffffff;
 129     prstatus->regs.edx = env->regs[R_EDX] & 0xffffffff;
 130     prstatus->regs.ecx = env->regs[R_ECX] & 0xffffffff;
 131     prstatus->regs.ebx = env->regs[R_EBX] & 0xffffffff;
 132     prstatus->regs.eax = env->regs[R_EAX] & 0xffffffff;
 133     prstatus->regs.eip = env->eip & 0xffffffff;
 134     prstatus->regs.eflags = env->eflags & 0xffffffff;
 135
 136     prstatus->regs.cs = env->segs[R_CS].selector;
 137     prstatus->regs.ss = env->segs[R_SS].selector;
 138     prstatus->regs.ds = env->segs[R_DS].selector;
 139     prstatus->regs.es = env->segs[R_ES].selector;
 140     prstatus->regs.fs = env->segs[R_FS].selector;
 141     prstatus->regs.gs = env->segs[R_GS].selector;
 142
 143     prstatus->pid = id;
 144 }
 145
 146 static int x86_write_elf64_note(WriteCoreDumpFunction f, CPUX86State *env,
 147                                 int id, void *opaque)
 148 {
 149     x86_elf_prstatus prstatus;
 150     Elf64_Nhdr *note;
 151     char *buf;
 152     int descsz, note_size, name_size = 5;
 153     const char *name = "CORE";
 154     int ret;
 155
 156     x86_fill_elf_prstatus(&prstatus, env, id);
 157     descsz = sizeof(x86_elf_prstatus);
 158     note_size = ((sizeof(Elf64_Nhdr) + 3) / 4 + (name_size + 3) / 4 +
 159                 (descsz + 3) / 4) * 4;
 160     note = g_malloc0(note_size);
 161     note->n_namesz = cpu_to_le32(name_size);
 162     note->n_descsz = cpu_to_le32(descsz);
 163     note->n_type = cpu_to_le32(NT_PRSTATUS);
 164     buf = (char *)note;
 165     buf += ((sizeof(Elf64_Nhdr) + 3) / 4) * 4;
 166     memcpy(buf, name, name_size);
 167     buf += ((name_size + 3) / 4) * 4;
 168     memcpy(buf, &prstatus, sizeof(prstatus));
 169
 170     ret = f(note, note_size, opaque);
 171     g_free(note);
 172     if (ret < 0) {
 173         return -1;
 174     }
 175
 176     return 0;
 177 }
 178
 179 int x86_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
 180                              int cpuid, void *opaque)
 181 {
 182     X86CPU *cpu = X86_CPU(cs);
 183     int ret;
 184 #ifdef TARGET_X86_64
 185     X86CPU *first_x86_cpu = X86_CPU(first_cpu);
 186     bool lma = !!(first_x86_cpu->env.hflags & HF_LMA_MASK);
 187
 188     if (lma) {
 189         ret = x86_64_write_elf64_note(f, &cpu->env, cpuid, opaque);
 190     } else {
 191 #endif
 192         ret = x86_write_elf64_note(f, &cpu->env, cpuid, opaque);
 193 #ifdef TARGET_X86_64
 194     }
 195 #endif
 196
 197     return ret;
 198 }
 199
 200 int x86_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs,
 201                              int cpuid, void *opaque)
 202 {
 203     X86CPU *cpu = X86_CPU(cs);
 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, &cpu->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_malloc0(note_size);
 216     note->n_namesz = cpu_to_le32(name_size);
 217     note->n_descsz = cpu_to_le32(descsz);
 218     note->n_type = cpu_to_le32(NT_PRSTATUS);
 219     buf = (char *)note;
 220     buf += ((sizeof(Elf32_Nhdr) + 3) / 4) * 4;
 221     memcpy(buf, name, name_size);
 222     buf += ((name_size + 3) / 4) * 4;
 223     memcpy(buf, &prstatus, sizeof(prstatus));
 224
 225     ret = f(note, note_size, opaque);
 226     g_free(note);
 227     if (ret < 0) {
 228         return -1;
 229     }
 230
 231     return 0;
 232 }
 233
 234 /*
 235  * please count up QEMUCPUSTATE_VERSION if you have changed definition of
 236  * QEMUCPUState, and modify the tools using this information accordingly.
 237  */
 238 #define QEMUCPUSTATE_VERSION (1)
 239
 240 struct QEMUCPUSegment {
 241     uint32_t selector;
 242     uint32_t limit;
 243     uint32_t flags;
 244     uint32_t pad;
 245     uint64_t base;
 246 };
 247
 248 typedef struct QEMUCPUSegment QEMUCPUSegment;
 249
 250 struct QEMUCPUState {
 251     uint32_t version;
 252     uint32_t size;
 253     uint64_t rax, rbx, rcx, rdx, rsi, rdi, rsp, rbp;
 254     uint64_t r8, r9, r10, r11, r12, r13, r14, r15;
 255     uint64_t rip, rflags;
 256     QEMUCPUSegment cs, ds, es, fs, gs, ss;
 257     QEMUCPUSegment ldt, tr, gdt, idt;
 258     uint64_t cr[5];
 259 };
 260
 261 typedef struct QEMUCPUState QEMUCPUState;
 262
 263 static void copy_segment(QEMUCPUSegment *d, SegmentCache *s)
 264 {
 265     d->pad = 0;
 266     d->selector = s->selector;
 267     d->limit = s->limit;
 268     d->flags = s->flags;
 269     d->base = s->base;
 270 }
 271
 272 static void qemu_get_cpustate(QEMUCPUState *s, CPUX86State *env)
 273 {
 274     memset(s, 0, sizeof(QEMUCPUState));
 275
 276     s->version = QEMUCPUSTATE_VERSION;
 277     s->size = sizeof(QEMUCPUState);
 278
 279     s->rax = env->regs[R_EAX];
 280     s->rbx = env->regs[R_EBX];
 281     s->rcx = env->regs[R_ECX];
 282     s->rdx = env->regs[R_EDX];
 283     s->rsi = env->regs[R_ESI];
 284     s->rdi = env->regs[R_EDI];
 285     s->rsp = env->regs[R_ESP];
 286     s->rbp = env->regs[R_EBP];
 287 #ifdef TARGET_X86_64
 288     s->r8  = env->regs[8];
 289     s->r9  = env->regs[9];
 290     s->r10 = env->regs[10];
 291     s->r11 = env->regs[11];
 292     s->r12 = env->regs[12];
 293     s->r13 = env->regs[13];
 294     s->r14 = env->regs[14];
 295     s->r15 = env->regs[15];
 296 #endif
 297     s->rip = env->eip;
 298     s->rflags = env->eflags;
 299
 300     copy_segment(&s->cs, &env->segs[R_CS]);
 301     copy_segment(&s->ds, &env->segs[R_DS]);
 302     copy_segment(&s->es, &env->segs[R_ES]);
 303     copy_segment(&s->fs, &env->segs[R_FS]);
 304     copy_segment(&s->gs, &env->segs[R_GS]);
 305     copy_segment(&s->ss, &env->segs[R_SS]);
 306     copy_segment(&s->ldt, &env->ldt);
 307     copy_segment(&s->tr, &env->tr);
 308     copy_segment(&s->gdt, &env->gdt);
 309     copy_segment(&s->idt, &env->idt);
 310
 311     s->cr[0] = env->cr[0];
 312     s->cr[1] = env->cr[1];
 313     s->cr[2] = env->cr[2];
 314     s->cr[3] = env->cr[3];
 315     s->cr[4] = env->cr[4];
 316 }
 317
 318 static inline int cpu_write_qemu_note(WriteCoreDumpFunction f,
 319                                       CPUX86State *env,
 320                                       void *opaque,
 321                                       int type)
 322 {
 323     QEMUCPUState state;
 324     Elf64_Nhdr *note64;
 325     Elf32_Nhdr *note32;
 326     void *note;
 327     char *buf;
 328     int descsz, note_size, name_size = 5, note_head_size;
 329     const char *name = "QEMU";
 330     int ret;
 331
 332     qemu_get_cpustate(&state, env);
 333
 334     descsz = sizeof(state);
 335     if (type == 0) {
 336         note_head_size = sizeof(Elf32_Nhdr);
 337     } else {
 338         note_head_size = sizeof(Elf64_Nhdr);
 339     }
 340     note_size = ((note_head_size + 3) / 4 + (name_size + 3) / 4 +
 341                 (descsz + 3) / 4) * 4;
 342     note = g_malloc0(note_size);
 343     if (type == 0) {
 344         note32 = note;
 345         note32->n_namesz = cpu_to_le32(name_size);
 346         note32->n_descsz = cpu_to_le32(descsz);
 347         note32->n_type = 0;
 348     } else {
 349         note64 = note;
 350         note64->n_namesz = cpu_to_le32(name_size);
 351         note64->n_descsz = cpu_to_le32(descsz);
 352         note64->n_type = 0;
 353     }
 354     buf = note;
 355     buf += ((note_head_size + 3) / 4) * 4;
 356     memcpy(buf, name, name_size);
 357     buf += ((name_size + 3) / 4) * 4;
 358     memcpy(buf, &state, sizeof(state));
 359
 360     ret = f(note, note_size, opaque);
 361     g_free(note);
 362     if (ret < 0) {
 363         return -1;
 364     }
 365
 366     return 0;
 367 }
 368
 369 int x86_cpu_write_elf64_qemunote(WriteCoreDumpFunction f, CPUState *cs,
 370                                  void *opaque)
 371 {
 372     X86CPU *cpu = X86_CPU(cs);
 373
 374     return cpu_write_qemu_note(f, &cpu->env, opaque, 1);
 375 }
 376
 377 int x86_cpu_write_elf32_qemunote(WriteCoreDumpFunction f, CPUState *cs,
 378                                  void *opaque)
 379 {
 380     X86CPU *cpu = X86_CPU(cs);
 381
 382     return cpu_write_qemu_note(f, &cpu->env, opaque, 0);
 383 }
 384
 385 int cpu_get_dump_info(ArchDumpInfo *info,
 386                       const GuestPhysBlockList *guest_phys_blocks)
 387 {
 388     bool lma = false;
 389     GuestPhysBlock *block;
 390
 391 #ifdef TARGET_X86_64
 392     X86CPU *first_x86_cpu = X86_CPU(first_cpu);
 393
 394     lma = !!(first_x86_cpu->env.hflags & HF_LMA_MASK);
 395 #endif
 396
 397     if (lma) {
 398         info->d_machine = EM_X86_64;
 399     } else {
 400         info->d_machine = EM_386;
 401     }
 402     info->d_endian = ELFDATA2LSB;
 403
 404     if (lma) {
 405         info->d_class = ELFCLASS64;
 406     } else {
 407         info->d_class = ELFCLASS32;
 408
 409         QTAILQ_FOREACH(block, &guest_phys_blocks->head, next) {
 410             if (block->target_end > UINT_MAX) {
 411                 /* The memory size is greater than 4G */
 412                 info->d_class = ELFCLASS64;
 413                 break;
 414             }
 415         }
 416     }
 417
 418     return 0;
 419 }
 420
 421 ssize_t cpu_get_note_size(int class, int machine, int nr_cpus)
 422 {
 423     int name_size = 5; /* "CORE" or "QEMU" */
 424     size_t elf_note_size = 0;
 425     size_t qemu_note_size = 0;
 426     int elf_desc_size = 0;
 427     int qemu_desc_size = 0;
 428     int note_head_size;
 429
 430     if (class == ELFCLASS32) {
 431         note_head_size = sizeof(Elf32_Nhdr);
 432     } else {
 433         note_head_size = sizeof(Elf64_Nhdr);
 434     }
 435
 436     if (machine == EM_386) {
 437         elf_desc_size = sizeof(x86_elf_prstatus);
 438     }
 439 #ifdef TARGET_X86_64
 440     else {
 441         elf_desc_size = sizeof(x86_64_elf_prstatus);
 442     }
 443 #endif
 444     qemu_desc_size = sizeof(QEMUCPUState);
 445
 446     elf_note_size = ((note_head_size + 3) / 4 + (name_size + 3) / 4 +
 447                      (elf_desc_size + 3) / 4) * 4;
 448     qemu_note_size = ((note_head_size + 3) / 4 + (name_size + 3) / 4 +
 449                       (qemu_desc_size + 3) / 4) * 4;
 450
 451     return (elf_note_size + qemu_note_size) * nr_cpus;
 452 }