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 "qemu/osdep.h"
  15 #include "cpu.h"
  16 #include "exec/cpu-all.h"
  17 #include "sysemu/dump.h"
  18 #include "elf.h"
  19 #include "sysemu/memory_mapping.h"
  20
  21 #ifdef TARGET_X86_64
  22 typedef struct {
  23     target_ulong r15, r14, r13, r12, rbp, rbx, r11, r10;
  24     target_ulong r9, r8, rax, rcx, rdx, rsi, rdi, orig_rax;
  25     target_ulong rip, cs, eflags;
  26     target_ulong rsp, ss;
  27     target_ulong fs_base, gs_base;
  28     target_ulong ds, es, fs, gs;
  29 } x86_64_user_regs_struct;
  30
  31 typedef struct {
  32     char pad1[32];
  33     uint32_t pid;
  34     char pad2[76];
  35     x86_64_user_regs_struct regs;
  36     char pad3[8];
  37 } x86_64_elf_prstatus;
  38
  39 static int x86_64_write_elf64_note(WriteCoreDumpFunction f,
  40                                    CPUX86State *env, int id,
  41                                    void *opaque)
  42 {
  43     x86_64_user_regs_struct regs;
  44     Elf64_Nhdr *note;
  45     char *buf;
  46     int descsz, note_size, name_size = 5;
  47     const char *name = "CORE";
  48     int ret;
  49
  50     regs.r15 = env->regs[15];
  51     regs.r14 = env->regs[14];
  52     regs.r13 = env->regs[13];
  53     regs.r12 = env->regs[12];
  54     regs.r11 = env->regs[11];
  55     regs.r10 = env->regs[10];
  56     regs.r9  = env->regs[9];
  57     regs.r8  = env->regs[8];
  58     regs.rbp = env->regs[R_EBP];
  59     regs.rsp = env->regs[R_ESP];
  60     regs.rdi = env->regs[R_EDI];
  61     regs.rsi = env->regs[R_ESI];
  62     regs.rdx = env->regs[R_EDX];
  63     regs.rcx = env->regs[R_ECX];
  64     regs.rbx = env->regs[R_EBX];
  65     regs.rax = env->regs[R_EAX];
  66     regs.rip = env->eip;
  67     regs.eflags = env->eflags;
  68
  69     regs.orig_rax = 0; /* FIXME */
  70     regs.cs = env->segs[R_CS].selector;
  71     regs.ss = env->segs[R_SS].selector;
  72     regs.fs_base = env->segs[R_FS].base;
  73     regs.gs_base = env->segs[R_GS].base;
  74     regs.ds = env->segs[R_DS].selector;
  75     regs.es = env->segs[R_ES].selector;
  76     regs.fs = env->segs[R_FS].selector;
  77     regs.gs = env->segs[R_GS].selector;
  78
  79     descsz = sizeof(x86_64_elf_prstatus);
  80     note_size = ((sizeof(Elf64_Nhdr) + 3) / 4 + (name_size + 3) / 4 +
  81                 (descsz + 3) / 4) * 4;
  82     note = g_malloc0(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, CPUX86State *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(WriteCoreDumpFunction f, CPUX86State *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_malloc0(note_size);
 162     note->n_namesz = cpu_to_le32(name_size);
 163     note->n_descsz = cpu_to_le32(descsz);
 164     note->n_type = cpu_to_le32(NT_PRSTATUS);
 165     buf = (char *)note;
 166     buf += ((sizeof(Elf64_Nhdr) + 3) / 4) * 4;
 167     memcpy(buf, name, name_size);
 168     buf += ((name_size + 3) / 4) * 4;
 169     memcpy(buf, &prstatus, sizeof(prstatus));
 170
 171     ret = f(note, note_size, opaque);
 172     g_free(note);
 173     if (ret < 0) {
 174         return -1;
 175     }
 176
 177     return 0;
 178 }
 179
 180 int x86_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
 181                              int cpuid, void *opaque)
 182 {
 183     X86CPU *cpu = X86_CPU(cs);
 184     int ret;
 185 #ifdef TARGET_X86_64
 186     X86CPU *first_x86_cpu = X86_CPU(first_cpu);
 187     bool lma = !!(first_x86_cpu->env.hflags & HF_LMA_MASK);
 188
 189     if (lma) {
 190         ret = x86_64_write_elf64_note(f, &cpu->env, cpuid, opaque);
 191     } else {
 192 #endif
 193         ret = x86_write_elf64_note(f, &cpu->env, cpuid, opaque);
 194 #ifdef TARGET_X86_64
 195     }
 196 #endif
 197
 198     return ret;
 199 }
 200
 201 int x86_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs,
 202                              int cpuid, void *opaque)
 203 {
 204     X86CPU *cpu = X86_CPU(cs);
 205     x86_elf_prstatus prstatus;
 206     Elf32_Nhdr *note;
 207     char *buf;
 208     int descsz, note_size, name_size = 5;
 209     const char *name = "CORE";
 210     int ret;
 211
 212     x86_fill_elf_prstatus(&prstatus, &cpu->env, cpuid);
 213     descsz = sizeof(x86_elf_prstatus);
 214     note_size = ((sizeof(Elf32_Nhdr) + 3) / 4 + (name_size + 3) / 4 +
 215                 (descsz + 3) / 4) * 4;
 216     note = g_malloc0(note_size);
 217     note->n_namesz = cpu_to_le32(name_size);
 218     note->n_descsz = cpu_to_le32(descsz);
 219     note->n_type = cpu_to_le32(NT_PRSTATUS);
 220     buf = (char *)note;
 221     buf += ((sizeof(Elf32_Nhdr) + 3) / 4) * 4;
 222     memcpy(buf, name, name_size);
 223     buf += ((name_size + 3) / 4) * 4;
 224     memcpy(buf, &prstatus, sizeof(prstatus));
 225
 226     ret = f(note, note_size, opaque);
 227     g_free(note);
 228     if (ret < 0) {
 229         return -1;
 230     }
 231
 232     return 0;
 233 }
 234
 235 /*
 236  * please count up QEMUCPUSTATE_VERSION if you have changed definition of
 237  * QEMUCPUState, and modify the tools using this information accordingly.
 238  */
 239 #define QEMUCPUSTATE_VERSION (1)
 240
 241 struct QEMUCPUSegment {
 242     uint32_t selector;
 243     uint32_t limit;
 244     uint32_t flags;
 245     uint32_t pad;
 246     uint64_t base;
 247 };
 248
 249 typedef struct QEMUCPUSegment QEMUCPUSegment;
 250
 251 struct QEMUCPUState {
 252     uint32_t version;
 253     uint32_t size;
 254     uint64_t rax, rbx, rcx, rdx, rsi, rdi, rsp, rbp;
 255     uint64_t r8, r9, r10, r11, r12, r13, r14, r15;
 256     uint64_t rip, rflags;
 257     QEMUCPUSegment cs, ds, es, fs, gs, ss;
 258     QEMUCPUSegment ldt, tr, gdt, idt;
 259     uint64_t cr[5];
 260 };
 261
 262 typedef struct QEMUCPUState QEMUCPUState;
 263
 264 static void copy_segment(QEMUCPUSegment *d, SegmentCache *s)
 265 {
 266     d->pad = 0;
 267     d->selector = s->selector;
 268     d->limit = s->limit;
 269     d->flags = s->flags;
 270     d->base = s->base;
 271 }
 272
 273 static void qemu_get_cpustate(QEMUCPUState *s, CPUX86State *env)
 274 {
 275     memset(s, 0, sizeof(QEMUCPUState));
 276
 277     s->version = QEMUCPUSTATE_VERSION;
 278     s->size = sizeof(QEMUCPUState);
 279
 280     s->rax = env->regs[R_EAX];
 281     s->rbx = env->regs[R_EBX];
 282     s->rcx = env->regs[R_ECX];
 283     s->rdx = env->regs[R_EDX];
 284     s->rsi = env->regs[R_ESI];
 285     s->rdi = env->regs[R_EDI];
 286     s->rsp = env->regs[R_ESP];
 287     s->rbp = env->regs[R_EBP];
 288 #ifdef TARGET_X86_64
 289     s->r8  = env->regs[8];
 290     s->r9  = env->regs[9];
 291     s->r10 = env->regs[10];
 292     s->r11 = env->regs[11];
 293     s->r12 = env->regs[12];
 294     s->r13 = env->regs[13];
 295     s->r14 = env->regs[14];
 296     s->r15 = env->regs[15];
 297 #endif
 298     s->rip = env->eip;
 299     s->rflags = env->eflags;
 300
 301     copy_segment(&s->cs, &env->segs[R_CS]);
 302     copy_segment(&s->ds, &env->segs[R_DS]);
 303     copy_segment(&s->es, &env->segs[R_ES]);
 304     copy_segment(&s->fs, &env->segs[R_FS]);
 305     copy_segment(&s->gs, &env->segs[R_GS]);
 306     copy_segment(&s->ss, &env->segs[R_SS]);
 307     copy_segment(&s->ldt, &env->ldt);
 308     copy_segment(&s->tr, &env->tr);
 309     copy_segment(&s->gdt, &env->gdt);
 310     copy_segment(&s->idt, &env->idt);
 311
 312     s->cr[0] = env->cr[0];
 313     s->cr[1] = env->cr[1];
 314     s->cr[2] = env->cr[2];
 315     s->cr[3] = env->cr[3];
 316     s->cr[4] = env->cr[4];
 317 }
 318
 319 static inline int cpu_write_qemu_note(WriteCoreDumpFunction f,
 320                                       CPUX86State *env,
 321                                       void *opaque,
 322                                       int type)
 323 {
 324     QEMUCPUState state;
 325     Elf64_Nhdr *note64;
 326     Elf32_Nhdr *note32;
 327     void *note;
 328     char *buf;
 329     int descsz, note_size, name_size = 5, note_head_size;
 330     const char *name = "QEMU";
 331     int ret;
 332
 333     qemu_get_cpustate(&state, env);
 334
 335     descsz = sizeof(state);
 336     if (type == 0) {
 337         note_head_size = sizeof(Elf32_Nhdr);
 338     } else {
 339         note_head_size = sizeof(Elf64_Nhdr);
 340     }
 341     note_size = ((note_head_size + 3) / 4 + (name_size + 3) / 4 +
 342                 (descsz + 3) / 4) * 4;
 343     note = g_malloc0(note_size);
 344     if (type == 0) {
 345         note32 = note;
 346         note32->n_namesz = cpu_to_le32(name_size);
 347         note32->n_descsz = cpu_to_le32(descsz);
 348         note32->n_type = 0;
 349     } else {
 350         note64 = note;
 351         note64->n_namesz = cpu_to_le32(name_size);
 352         note64->n_descsz = cpu_to_le32(descsz);
 353         note64->n_type = 0;
 354     }
 355     buf = note;
 356     buf += ((note_head_size + 3) / 4) * 4;
 357     memcpy(buf, name, name_size);
 358     buf += ((name_size + 3) / 4) * 4;
 359     memcpy(buf, &state, sizeof(state));
 360
 361     ret = f(note, note_size, opaque);
 362     g_free(note);
 363     if (ret < 0) {
 364         return -1;
 365     }
 366
 367     return 0;
 368 }
 369
 370 int x86_cpu_write_elf64_qemunote(WriteCoreDumpFunction f, CPUState *cs,
 371                                  void *opaque)
 372 {
 373     X86CPU *cpu = X86_CPU(cs);
 374
 375     return cpu_write_qemu_note(f, &cpu->env, opaque, 1);
 376 }
 377
 378 int x86_cpu_write_elf32_qemunote(WriteCoreDumpFunction f, CPUState *cs,
 379                                  void *opaque)
 380 {
 381     X86CPU *cpu = X86_CPU(cs);
 382
 383     return cpu_write_qemu_note(f, &cpu->env, opaque, 0);
 384 }
 385
 386 int cpu_get_dump_info(ArchDumpInfo *info,
 387                       const GuestPhysBlockList *guest_phys_blocks)
 388 {
 389     bool lma = false;
 390     GuestPhysBlock *block;
 391
 392 #ifdef TARGET_X86_64
 393     X86CPU *first_x86_cpu = X86_CPU(first_cpu);
 394
 395     lma = !!(first_x86_cpu->env.hflags & HF_LMA_MASK);
 396 #endif
 397
 398     if (lma) {
 399         info->d_machine = EM_X86_64;
 400     } else {
 401         info->d_machine = EM_386;
 402     }
 403     info->d_endian = ELFDATA2LSB;
 404
 405     if (lma) {
 406         info->d_class = ELFCLASS64;
 407     } else {
 408         info->d_class = ELFCLASS32;
 409
 410         QTAILQ_FOREACH(block, &guest_phys_blocks->head, next) {
 411             if (block->target_end > UINT_MAX) {
 412                 /* The memory size is greater than 4G */
 413                 info->d_class = ELFCLASS64;
 414                 break;
 415             }
 416         }
 417     }
 418
 419     return 0;
 420 }
 421
 422 ssize_t cpu_get_note_size(int class, int machine, int nr_cpus)
 423 {
 424     int name_size = 5; /* "CORE" or "QEMU" */
 425     size_t elf_note_size = 0;
 426     size_t qemu_note_size = 0;
 427     int elf_desc_size = 0;
 428     int qemu_desc_size = 0;
 429     int note_head_size;
 430
 431     if (class == ELFCLASS32) {
 432         note_head_size = sizeof(Elf32_Nhdr);
 433     } else {
 434         note_head_size = sizeof(Elf64_Nhdr);
 435     }
 436
 437     if (machine == EM_386) {
 438         elf_desc_size = sizeof(x86_elf_prstatus);
 439     }
 440 #ifdef TARGET_X86_64
 441     else {
 442         elf_desc_size = sizeof(x86_64_elf_prstatus);
 443     }
 444 #endif
 445     qemu_desc_size = sizeof(QEMUCPUState);
 446
 447     elf_note_size = ((note_head_size + 3) / 4 + (name_size + 3) / 4 +
 448                      (elf_desc_size + 3) / 4) * 4;
 449     qemu_note_size = ((note_head_size + 3) / 4 + (name_size + 3) / 4 +
 450                       (qemu_desc_size + 3) / 4) * 4;
 451
 452     return (elf_note_size + qemu_note_size) * nr_cpus;
 453 }