target-ppc/arch_dump.c

   1 /*
   2  * writing ELF notes for ppc64 arch
   3  *
   4  *
   5  * Copyright IBM, Corp. 2013
   6  *
   7  * Authors:
   8  * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2.  See
  11  * the COPYING file in the top-level directory.
  12  *
  13  */
  14
  15 #include "cpu.h"
  16 #include "elf.h"
  17 #include "exec/cpu-all.h"
  18 #include "sysemu/dump.h"
  19 #include "sysemu/kvm.h"
  20
  21 struct PPC64UserRegStruct {
  22     uint64_t gpr[32];
  23     uint64_t nip;
  24     uint64_t msr;
  25     uint64_t orig_gpr3;
  26     uint64_t ctr;
  27     uint64_t link;
  28     uint64_t xer;
  29     uint64_t ccr;
  30     uint64_t softe;
  31     uint64_t trap;
  32     uint64_t dar;
  33     uint64_t dsisr;
  34     uint64_t result;
  35 } QEMU_PACKED;
  36
  37 struct PPC64ElfPrstatus {
  38     char pad1[112];
  39     struct PPC64UserRegStruct pr_reg;
  40     uint64_t pad2[4];
  41 } QEMU_PACKED;
  42
  43
  44 struct PPC64ElfFpregset {
  45     uint64_t fpr[32];
  46     uint64_t fpscr;
  47 }  QEMU_PACKED;
  48
  49
  50 struct PPC64ElfVmxregset {
  51     ppc_avr_t avr[32];
  52     ppc_avr_t vscr;
  53     union {
  54         ppc_avr_t unused;
  55         uint32_t value;
  56     } vrsave;
  57 }  QEMU_PACKED;
  58
  59 struct PPC64ElfVsxregset {
  60     uint64_t vsr[32];
  61 }  QEMU_PACKED;
  62
  63 struct PPC64ElfSperegset {
  64     uint32_t evr[32];
  65     uint64_t spe_acc;
  66     uint32_t spe_fscr;
  67 }  QEMU_PACKED;
  68
  69 typedef struct noteStruct {
  70     Elf64_Nhdr hdr;
  71     char name[5];
  72     char pad3[3];
  73     union {
  74         struct PPC64ElfPrstatus  prstatus;
  75         struct PPC64ElfFpregset  fpregset;
  76         struct PPC64ElfVmxregset vmxregset;
  77         struct PPC64ElfVsxregset vsxregset;
  78         struct PPC64ElfSperegset speregset;
  79     } contents;
  80 } QEMU_PACKED Note;
  81
  82 typedef struct NoteFuncArg {
  83     Note note;
  84     DumpState *state;
  85 } NoteFuncArg;
  86
  87 static void ppc64_write_elf64_prstatus(NoteFuncArg *arg, PowerPCCPU *cpu)
  88 {
  89     int i;
  90     uint64_t cr;
  91     struct PPC64ElfPrstatus *prstatus;
  92     struct PPC64UserRegStruct *reg;
  93     Note *note = &arg->note;
  94     DumpState *s = arg->state;
  95
  96     note->hdr.n_type = cpu_to_dump32(s, NT_PRSTATUS);
  97
  98     prstatus = &note->contents.prstatus;
  99     memset(prstatus, 0, sizeof(*prstatus));
 100     reg = &prstatus->pr_reg;
 101
 102     for (i = 0; i < 32; i++) {
 103         reg->gpr[i] = cpu_to_dump64(s, cpu->env.gpr[i]);
 104     }
 105     reg->nip = cpu_to_dump64(s, cpu->env.nip);
 106     reg->msr = cpu_to_dump64(s, cpu->env.msr);
 107     reg->ctr = cpu_to_dump64(s, cpu->env.ctr);
 108     reg->link = cpu_to_dump64(s, cpu->env.lr);
 109     reg->xer = cpu_to_dump64(s, cpu_read_xer(&cpu->env));
 110
 111     cr = 0;
 112     for (i = 0; i < 8; i++) {
 113         cr |= (cpu->env.crf[i] & 15) << (4 * (7 - i));
 114     }
 115     reg->ccr = cpu_to_dump64(s, cr);
 116 }
 117
 118 static void ppc64_write_elf64_fpregset(NoteFuncArg *arg, PowerPCCPU *cpu)
 119 {
 120     int i;
 121     struct PPC64ElfFpregset  *fpregset;
 122     Note *note = &arg->note;
 123     DumpState *s = arg->state;
 124
 125     note->hdr.n_type = cpu_to_dump32(s, NT_PRFPREG);
 126
 127     fpregset = &note->contents.fpregset;
 128     memset(fpregset, 0, sizeof(*fpregset));
 129
 130     for (i = 0; i < 32; i++) {
 131         fpregset->fpr[i] = cpu_to_dump64(s, cpu->env.fpr[i]);
 132     }
 133     fpregset->fpscr = cpu_to_dump64(s, cpu->env.fpscr);
 134 }
 135
 136 static void ppc64_write_elf64_vmxregset(NoteFuncArg *arg, PowerPCCPU *cpu)
 137 {
 138     int i;
 139     struct PPC64ElfVmxregset *vmxregset;
 140     Note *note = &arg->note;
 141     DumpState *s = arg->state;
 142
 143     note->hdr.n_type = cpu_to_dump32(s, NT_PPC_VMX);
 144     vmxregset = &note->contents.vmxregset;
 145     memset(vmxregset, 0, sizeof(*vmxregset));
 146
 147     for (i = 0; i < 32; i++) {
 148         bool needs_byteswap;
 149
 150 #ifdef HOST_WORDS_BIGENDIAN
 151         needs_byteswap = s->dump_info.d_endian == ELFDATA2LSB;
 152 #else
 153         needs_byteswap = s->dump_info.d_endian == ELFDATA2MSB;
 154 #endif
 155
 156         if (needs_byteswap) {
 157             vmxregset->avr[i].u64[0] = bswap64(cpu->env.avr[i].u64[1]);
 158             vmxregset->avr[i].u64[1] = bswap64(cpu->env.avr[i].u64[0]);
 159         } else {
 160             vmxregset->avr[i].u64[0] = cpu->env.avr[i].u64[0];
 161             vmxregset->avr[i].u64[1] = cpu->env.avr[i].u64[1];
 162         }
 163     }
 164     vmxregset->vscr.u32[3] = cpu_to_dump32(s, cpu->env.vscr);
 165 }
 166 static void ppc64_write_elf64_vsxregset(NoteFuncArg *arg, PowerPCCPU *cpu)
 167 {
 168     int i;
 169     struct PPC64ElfVsxregset *vsxregset;
 170     Note *note = &arg->note;
 171     DumpState *s = arg->state;
 172
 173     note->hdr.n_type = cpu_to_dump32(s, NT_PPC_VSX);
 174     vsxregset = &note->contents.vsxregset;
 175     memset(vsxregset, 0, sizeof(*vsxregset));
 176
 177     for (i = 0; i < 32; i++) {
 178         vsxregset->vsr[i] = cpu_to_dump64(s, cpu->env.vsr[i]);
 179     }
 180 }
 181 static void ppc64_write_elf64_speregset(NoteFuncArg *arg, PowerPCCPU *cpu)
 182 {
 183     struct PPC64ElfSperegset *speregset;
 184     Note *note = &arg->note;
 185     DumpState *s = arg->state;
 186
 187     note->hdr.n_type = cpu_to_dump32(s, NT_PPC_SPE);
 188     speregset = &note->contents.speregset;
 189     memset(speregset, 0, sizeof(*speregset));
 190
 191     speregset->spe_acc = cpu_to_dump64(s, cpu->env.spe_acc);
 192     speregset->spe_fscr = cpu_to_dump32(s, cpu->env.spe_fscr);
 193 }
 194
 195 static const struct NoteFuncDescStruct {
 196     int contents_size;
 197     void (*note_contents_func)(NoteFuncArg *arg, PowerPCCPU *cpu);
 198 } note_func[] = {
 199     {sizeof(((Note *)0)->contents.prstatus),  ppc64_write_elf64_prstatus},
 200     {sizeof(((Note *)0)->contents.fpregset),  ppc64_write_elf64_fpregset},
 201     {sizeof(((Note *)0)->contents.vmxregset), ppc64_write_elf64_vmxregset},
 202     {sizeof(((Note *)0)->contents.vsxregset), ppc64_write_elf64_vsxregset},
 203     {sizeof(((Note *)0)->contents.speregset), ppc64_write_elf64_speregset},
 204     { 0, NULL}
 205 };
 206
 207 typedef struct NoteFuncDescStruct NoteFuncDesc;
 208
 209 int cpu_get_dump_info(ArchDumpInfo *info,
 210                       const struct GuestPhysBlockList *guest_phys_blocks)
 211 {
 212     PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
 213     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
 214
 215     info->d_machine = EM_PPC64;
 216     info->d_class = ELFCLASS64;
 217     if ((*pcc->interrupts_big_endian)(cpu)) {
 218         info->d_endian = ELFDATA2MSB;
 219     } else {
 220         info->d_endian = ELFDATA2LSB;
 221     }
 222
 223     return 0;
 224 }
 225
 226 ssize_t cpu_get_note_size(int class, int machine, int nr_cpus)
 227 {
 228     int name_size = 8; /* "CORE" or "QEMU" rounded */
 229     size_t elf_note_size = 0;
 230     int note_head_size;
 231     const NoteFuncDesc *nf;
 232
 233     if (class != ELFCLASS64) {
 234         return -1;
 235     }
 236     assert(machine == EM_PPC64);
 237
 238     note_head_size = sizeof(Elf64_Nhdr);
 239
 240     for (nf = note_func; nf->note_contents_func; nf++) {
 241         elf_note_size = elf_note_size + note_head_size + name_size +
 242                         nf->contents_size;
 243     }
 244
 245     return (elf_note_size) * nr_cpus;
 246 }
 247
 248 static int ppc64_write_all_elf64_notes(const char *note_name,
 249                                        WriteCoreDumpFunction f,
 250                                        PowerPCCPU *cpu, int id,
 251                                        void *opaque)
 252 {
 253     NoteFuncArg arg = { .state = opaque };
 254     int ret = -1;
 255     int note_size;
 256     const NoteFuncDesc *nf;
 257
 258     for (nf = note_func; nf->note_contents_func; nf++) {
 259         arg.note.hdr.n_namesz = cpu_to_dump32(opaque, sizeof(arg.note.name));
 260         arg.note.hdr.n_descsz = cpu_to_dump32(opaque, nf->contents_size);
 261         strncpy(arg.note.name, note_name, sizeof(arg.note.name));
 262
 263         (*nf->note_contents_func)(&arg, cpu);
 264
 265         note_size =
 266             sizeof(arg.note) - sizeof(arg.note.contents) + nf->contents_size;
 267         ret = f(&arg.note, note_size, opaque);
 268         if (ret < 0) {
 269             return -1;
 270         }
 271     }
 272     return 0;
 273 }
 274
 275 int ppc64_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
 276                                int cpuid, void *opaque)
 277 {
 278     PowerPCCPU *cpu = POWERPC_CPU(cs);
 279     return ppc64_write_all_elf64_notes("CORE", f, cpu, cpuid, opaque);
 280 }