Home | History | Annotate | Download | only in m_coredump 
      1 
      2 /*--------------------------------------------------------------------*/
      3 /*--- Dumping core.                                 coredump-elf.c ---*/
      4 /*--------------------------------------------------------------------*/
      5 
      6 /*
      7    This file is part of Valgrind, a dynamic binary instrumentation
      8    framework.
      9 
     10    Copyright (C) 2000-2011 Julian Seward
     11       jseward (at) acm.org
     12 
     13    This program is free software; you can redistribute it and/or
     14    modify it under the terms of the GNU General Public License as
     15    published by the Free Software Foundation; either version 2 of the
     16    License, or (at your option) any later version.
     17 
     18    This program is distributed in the hope that it will be useful, but
     19    WITHOUT ANY WARRANTY; without even the implied warranty of
     20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     21    General Public License for more details.
     22 
     23    You should have received a copy of the GNU General Public License
     24    along with this program; if not, write to the Free Software
     25    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     26    02111-1307, USA.
     27 
     28    The GNU General Public License is contained in the file COPYING.
     29 */
     30 
     31 #if defined(VGO_linux)
     32 
     33 #include "pub_core_basics.h"
     34 #include "pub_core_vki.h"
     35 #include "pub_core_aspacehl.h"
     36 #include "pub_core_aspacemgr.h"
     37 #include "pub_core_libcbase.h"
     38 #include "pub_core_machine.h"
     39 #include "pub_core_coredump.h"
     40 #include "pub_core_libcprint.h"
     41 #include "pub_core_libcfile.h"    // VG_(close) et al
     42 #include "pub_core_libcproc.h"    // VG_(geteuid), VG_(getegid)
     43 #include "pub_core_libcassert.h"  // VG_(exit), vg_assert
     44 #include "pub_core_mallocfree.h"  // VG_(malloc), VG_(free)
     45 #include "pub_core_libcsetjmp.h"  // to keep _threadstate.h happy
     46 #include "pub_core_threadstate.h"
     47 #include "pub_core_xarray.h"
     48 #include "pub_core_clientstate.h"
     49 #include "pub_core_options.h"
     50 
     51 /*
     52   Dump core
     53 
     54   Generate a standard ELF core file corresponding to the client state
     55   at the time of a crash.
     56  */
     57 #include <elf.h>
     58 #ifndef NT_PRXFPREG
     59 #define NT_PRXFPREG    0x46e62b7f /* copied from gdb5.1/include/elf/common.h */
     60 #endif /* NT_PRXFPREG */
     61 
     62 #if	VG_WORDSIZE == 8
     63 #define ESZ(x)	Elf64_##x
     64 #elif	VG_WORDSIZE == 4
     65 #define ESZ(x)	Elf32_##x
     66 #else
     67 #error VG_WORDSIZE needs to ==4 or ==8
     68 #endif
     69 
     70 /* If true, then this Segment may be mentioned in the core */
     71 static Bool may_dump(const NSegment *seg)
     72 {
     73    if (seg->kind == SkAnonC ||
     74        seg->kind == SkShmC ||
     75        (seg->kind == SkFileC &&
     76         !VKI_S_ISCHR(seg->mode) && !VKI_S_ISBLK(seg->mode)))
     77       return True;
     78 
     79    return False;
     80 }
     81 
     82 /* If true, then this Segment's contents will be in the core */
     83 static Bool should_dump(const NSegment *seg)
     84 {
     85    return may_dump(seg); // && seg->hasW;
     86 }
     87 
     88 static void fill_ehdr(ESZ(Ehdr) *ehdr, Int num_phdrs)
     89 {
     90    VG_(memset)(ehdr, 0, sizeof(*ehdr));
     91 
     92    VG_(memcpy)(ehdr->e_ident, ELFMAG, SELFMAG);
     93    ehdr->e_ident[EI_CLASS]   = VG_ELF_CLASS;
     94    ehdr->e_ident[EI_DATA]    = VG_ELF_DATA2XXX;
     95    ehdr->e_ident[EI_VERSION] = EV_CURRENT;
     96 
     97    ehdr->e_type = ET_CORE;
     98    ehdr->e_machine = VG_ELF_MACHINE;
     99    ehdr->e_version = EV_CURRENT;
    100    ehdr->e_entry = 0;
    101    ehdr->e_phoff = sizeof(ESZ(Ehdr));
    102    ehdr->e_shoff = 0;
    103    ehdr->e_flags = 0;
    104    ehdr->e_ehsize = sizeof(ESZ(Ehdr));
    105    ehdr->e_phentsize = sizeof(ESZ(Phdr));
    106    ehdr->e_phnum = num_phdrs;
    107    ehdr->e_shentsize = 0;
    108    ehdr->e_shnum = 0;
    109    ehdr->e_shstrndx = 0;
    110 
    111 }
    112 
    113 static void fill_phdr(ESZ(Phdr) *phdr, const NSegment *seg, UInt off, Bool write)
    114 {
    115    SizeT len = seg->end - seg->start;
    116 
    117    write = write && should_dump(seg);
    118 
    119    VG_(memset)(phdr, 0, sizeof(*phdr));
    120 
    121    phdr->p_type = PT_LOAD;
    122    phdr->p_offset = off;
    123    phdr->p_vaddr = seg->start;
    124    phdr->p_paddr = 0;
    125    phdr->p_filesz = write ? len : 0;
    126    phdr->p_memsz = len;
    127    phdr->p_flags = 0;
    128 
    129    if (seg->hasR)
    130       phdr->p_flags |= PF_R;
    131    if (seg->hasW)
    132       phdr->p_flags |= PF_W;
    133    if (seg->hasX)
    134       phdr->p_flags |= PF_X;
    135 
    136    phdr->p_align = VKI_PAGE_SIZE;
    137 }
    138 
    139 struct note {
    140    struct note *next;
    141    ESZ(Nhdr) note;
    142    Char name[0];
    143 };
    144 
    145 static UInt note_size(const struct note *n)
    146 {
    147    return sizeof(ESZ(Nhdr)) + VG_ROUNDUP(VG_(strlen)(n->name)+1, 4)
    148                             + VG_ROUNDUP(n->note.n_descsz, 4);
    149 }
    150 
    151 #if !defined(VGPV_arm_linux_android)
    152 static void add_note(struct note **list, const Char *name, UInt type,
    153                      const void *data, UInt datasz)
    154 {
    155    Int namelen = VG_(strlen)(name)+1;
    156    Int notelen = sizeof(struct note) +
    157       VG_ROUNDUP(namelen, 4) +
    158       VG_ROUNDUP(datasz, 4);
    159    struct note *n = VG_(arena_malloc)(VG_AR_CORE, "coredump-elf.an.1", notelen);
    160 
    161    VG_(memset)(n, 0, notelen);
    162 
    163    n->next = *list;
    164    *list = n;
    165 
    166    n->note.n_type = type;
    167    n->note.n_namesz = namelen;
    168    n->note.n_descsz = datasz;
    169 
    170    VG_(memcpy)(n->name, name, namelen);
    171    VG_(memcpy)(n->name+VG_ROUNDUP(namelen,4), data, datasz);
    172 }
    173 #endif /* !defined(VGPV_arm_linux_android) */
    174 
    175 static void write_note(Int fd, const struct note *n)
    176 {
    177    VG_(write)(fd, &n->note, note_size(n));
    178 }
    179 
    180 static void fill_prpsinfo(const ThreadState *tst,
    181                           struct vki_elf_prpsinfo *prpsinfo)
    182 {
    183    static Char name[VKI_PATH_MAX];
    184 
    185    VG_(memset)(prpsinfo, 0, sizeof(*prpsinfo));
    186 
    187    switch(tst->status) {
    188    case VgTs_Runnable:
    189    case VgTs_Yielding:
    190       prpsinfo->pr_sname = 'R';
    191       break;
    192 
    193    case VgTs_WaitSys:
    194       prpsinfo->pr_sname = 'S';
    195       break;
    196 
    197    case VgTs_Zombie:
    198       prpsinfo->pr_sname = 'Z';
    199       break;
    200 
    201    case VgTs_Empty:
    202    case VgTs_Init:
    203       prpsinfo->pr_sname = '?';
    204       break;
    205    }
    206 
    207    prpsinfo->pr_uid = 0;
    208    prpsinfo->pr_gid = 0;
    209 
    210    if (VG_(resolve_filename)(VG_(cl_exec_fd), name, VKI_PATH_MAX)) {
    211       Char *n = name+VG_(strlen)(name)-1;
    212 
    213       while (n > name && *n != '/')
    214 	 n--;
    215       if (n != name)
    216 	 n++;
    217 
    218       VG_(strncpy)(prpsinfo->pr_fname, n, sizeof(prpsinfo->pr_fname));
    219    }
    220 }
    221 
    222 static void fill_prstatus(const ThreadState *tst,
    223 			  struct vki_elf_prstatus *prs,
    224 			  const vki_siginfo_t *si)
    225 {
    226    struct vki_user_regs_struct *regs;
    227    ThreadArchState* arch = (ThreadArchState*)&tst->arch;
    228 
    229    VG_(memset)(prs, 0, sizeof(*prs));
    230 
    231    prs->pr_info.si_signo = si->si_signo;
    232    prs->pr_info.si_code = si->si_code;
    233    prs->pr_info.si_errno = 0;
    234 
    235    prs->pr_cursig = si->si_signo;
    236 
    237    prs->pr_pid = tst->os_state.lwpid;
    238    prs->pr_ppid = 0;
    239    prs->pr_pgrp = VG_(getpgrp)();
    240    prs->pr_sid = VG_(getpgrp)();
    241 
    242 #ifdef VGP_s390x_linux
    243    /* prs->pr_reg has struct type. Need to take address. */
    244    regs = (struct vki_user_regs_struct *)&(prs->pr_reg);
    245 #else
    246    regs = (struct vki_user_regs_struct *)prs->pr_reg;
    247 
    248    vg_assert(sizeof(*regs) == sizeof(prs->pr_reg));
    249 #endif
    250 
    251 #if defined(VGP_x86_linux)
    252    regs->eflags = LibVEX_GuestX86_get_eflags( &arch->vex );
    253    regs->esp    = arch->vex.guest_ESP;
    254    regs->eip    = arch->vex.guest_EIP;
    255 
    256    regs->ebx    = arch->vex.guest_EBX;
    257    regs->ecx    = arch->vex.guest_ECX;
    258    regs->edx    = arch->vex.guest_EDX;
    259    regs->esi    = arch->vex.guest_ESI;
    260    regs->edi    = arch->vex.guest_EDI;
    261    regs->ebp    = arch->vex.guest_EBP;
    262    regs->eax    = arch->vex.guest_EAX;
    263 
    264    regs->cs     = arch->vex.guest_CS;
    265    regs->ds     = arch->vex.guest_DS;
    266    regs->ss     = arch->vex.guest_SS;
    267    regs->es     = arch->vex.guest_ES;
    268    regs->fs     = arch->vex.guest_FS;
    269    regs->gs     = arch->vex.guest_GS;
    270 
    271 #elif defined(VGP_amd64_linux)
    272    regs->eflags = LibVEX_GuestAMD64_get_rflags( &((ThreadArchState*)arch)->vex );
    273    regs->rsp    = arch->vex.guest_RSP;
    274    regs->rip    = arch->vex.guest_RIP;
    275 
    276    regs->rbx    = arch->vex.guest_RBX;
    277    regs->rcx    = arch->vex.guest_RCX;
    278    regs->rdx    = arch->vex.guest_RDX;
    279    regs->rsi    = arch->vex.guest_RSI;
    280    regs->rdi    = arch->vex.guest_RDI;
    281    regs->rbp    = arch->vex.guest_RBP;
    282    regs->rax    = arch->vex.guest_RAX;
    283    regs->r8     = arch->vex.guest_R8;
    284    regs->r9     = arch->vex.guest_R9;
    285    regs->r10    = arch->vex.guest_R10;
    286    regs->r11    = arch->vex.guest_R11;
    287    regs->r12    = arch->vex.guest_R12;
    288    regs->r13    = arch->vex.guest_R13;
    289    regs->r14    = arch->vex.guest_R14;
    290    regs->r15    = arch->vex.guest_R15;
    291 
    292 //::    regs->cs     = arch->vex.guest_CS;
    293 //::    regs->fs     = arch->vex.guest_FS;
    294 //::    regs->gs     = arch->vex.guest_GS;
    295 
    296 #elif defined(VGP_ppc32_linux)
    297 #  define DO(n)  regs->gpr[n] = arch->vex.guest_GPR##n
    298    DO(0);  DO(1);  DO(2);  DO(3);  DO(4);  DO(5);  DO(6);  DO(7);
    299    DO(8);  DO(9);  DO(10); DO(11); DO(12); DO(13); DO(14); DO(15);
    300    DO(16); DO(17); DO(18); DO(19); DO(20); DO(21); DO(22); DO(23);
    301    DO(24); DO(25); DO(26); DO(27); DO(28); DO(29); DO(30); DO(31);
    302 #  undef DO
    303 
    304    regs->nip = arch->vex.guest_CIA;
    305    regs->msr = 0xf032;   /* pretty arbitrary */
    306    regs->orig_gpr3 = arch->vex.guest_GPR3;
    307    regs->ctr = arch->vex.guest_CTR;
    308    regs->link = arch->vex.guest_LR;
    309    regs->xer = LibVEX_GuestPPC32_get_XER( &((ThreadArchState*)arch)->vex );
    310    regs->ccr = LibVEX_GuestPPC32_get_CR( &((ThreadArchState*)arch)->vex );
    311    regs->mq = 0;
    312    regs->trap = 0;
    313    regs->dar = 0; /* should be fault address? */
    314    regs->dsisr = 0;
    315    regs->result = 0;
    316 
    317 #elif defined(VGP_ppc64_linux)
    318 #  define DO(n)  regs->gpr[n] = arch->vex.guest_GPR##n
    319    DO(0);  DO(1);  DO(2);  DO(3);  DO(4);  DO(5);  DO(6);  DO(7);
    320    DO(8);  DO(9);  DO(10); DO(11); DO(12); DO(13); DO(14); DO(15);
    321    DO(16); DO(17); DO(18); DO(19); DO(20); DO(21); DO(22); DO(23);
    322    DO(24); DO(25); DO(26); DO(27); DO(28); DO(29); DO(30); DO(31);
    323 #  undef DO
    324 
    325    regs->nip = arch->vex.guest_CIA;
    326    regs->msr = 0xf032;   /* pretty arbitrary */
    327    regs->orig_gpr3 = arch->vex.guest_GPR3;
    328    regs->ctr = arch->vex.guest_CTR;
    329    regs->link = arch->vex.guest_LR;
    330    regs->xer = LibVEX_GuestPPC64_get_XER( &((ThreadArchState*)arch)->vex );
    331    regs->ccr = LibVEX_GuestPPC64_get_CR( &((ThreadArchState*)arch)->vex );
    332    /* regs->mq = 0; */
    333    regs->trap = 0;
    334    regs->dar = 0; /* should be fault address? */
    335    regs->dsisr = 0;
    336    regs->result = 0;
    337 
    338 #elif defined(VGP_arm_linux)
    339    regs->ARM_r0   = arch->vex.guest_R0;
    340    regs->ARM_r1   = arch->vex.guest_R1;
    341    regs->ARM_r2   = arch->vex.guest_R2;
    342    regs->ARM_r3   = arch->vex.guest_R3;
    343    regs->ARM_r4   = arch->vex.guest_R4;
    344    regs->ARM_r5   = arch->vex.guest_R5;
    345    regs->ARM_r6   = arch->vex.guest_R6;
    346    regs->ARM_r7   = arch->vex.guest_R7;
    347    regs->ARM_r8   = arch->vex.guest_R8;
    348    regs->ARM_r9   = arch->vex.guest_R9;
    349    regs->ARM_r10  = arch->vex.guest_R10;
    350    regs->ARM_fp   = arch->vex.guest_R11;
    351    regs->ARM_ip   = arch->vex.guest_R12;
    352    regs->ARM_sp   = arch->vex.guest_R13;
    353    regs->ARM_lr   = arch->vex.guest_R14;
    354    regs->ARM_pc   = arch->vex.guest_R15T;
    355    regs->ARM_cpsr = LibVEX_GuestARM_get_cpsr( &((ThreadArchState*)arch)->vex );
    356 
    357 #elif defined(VGP_s390x_linux)
    358 #  define DO(n)  regs->gprs[n] = arch->vex.guest_r##n
    359    DO(0);  DO(1);  DO(2);  DO(3);  DO(4);  DO(5);  DO(6);  DO(7);
    360    DO(8);  DO(9);  DO(10); DO(11); DO(12); DO(13); DO(14); DO(15);
    361 #  undef DO
    362 #  define DO(n)  regs->acrs[n] = arch->vex.guest_a##n
    363    DO(0);  DO(1);  DO(2);  DO(3);  DO(4);  DO(5);  DO(6);  DO(7);
    364    DO(8);  DO(9);  DO(10); DO(11); DO(12); DO(13); DO(14); DO(15);
    365 #  undef DO
    366    regs->orig_gpr2 = arch->vex.guest_r2;
    367 #else
    368 #  error Unknown ELF platform
    369 #endif
    370 }
    371 
    372 static void fill_fpu(const ThreadState *tst, vki_elf_fpregset_t *fpu)
    373 {
    374    __attribute__((unused))
    375    ThreadArchState* arch = (ThreadArchState*)&tst->arch;
    376 
    377 #if defined(VGP_x86_linux)
    378 //:: static void fill_fpu(vki_elf_fpregset_t *fpu, const Char *from)
    379 //:: {
    380 //::    if (VG_(have_ssestate)) {
    381 //::       UShort *to;
    382 //::       Int i;
    383 //::
    384 //::       /* This is what the kernel does */
    385 //::       VG_(memcpy)(fpu, from, 7*sizeof(long));
    386 //::
    387 //::       to = (UShort *)&fpu->st_space[0];
    388 //::       from += 18 * sizeof(UShort);
    389 //::
    390 //::       for (i = 0; i < 8; i++, to += 5, from += 8)
    391 //:: 	 VG_(memcpy)(to, from, 5*sizeof(UShort));
    392 //::    } else
    393 //::       VG_(memcpy)(fpu, from, sizeof(*fpu));
    394 //:: }
    395 
    396 //::    fill_fpu(fpu, (const Char *)&arch->m_sse);
    397 
    398 #elif defined(VGP_amd64_linux)
    399 //::    fpu->cwd = ?;
    400 //::    fpu->swd = ?;
    401 //::    fpu->twd = ?;
    402 //::    fpu->fop = ?;
    403 //::    fpu->rip = ?;
    404 //::    fpu->rdp = ?;
    405 //::    fpu->mxcsr = ?;
    406 //::    fpu->mxcsr_mask = ?;
    407 //::    fpu->st_space = ?;
    408 
    409 #  define DO(n)  VG_(memcpy)(fpu->xmm_space + n * 4, &arch->vex.guest_XMM##n, sizeof(arch->vex.guest_XMM##n))
    410    DO(0);  DO(1);  DO(2);  DO(3);  DO(4);  DO(5);  DO(6);  DO(7);
    411    DO(8);  DO(9);  DO(10); DO(11); DO(12); DO(13); DO(14); DO(15);
    412 #  undef DO
    413 
    414    VG_(memset)(fpu->padding, 0, sizeof(fpu->padding));
    415 
    416 #elif defined(VGP_ppc32_linux)
    417    /* The guest state has the FPR fields declared as ULongs, so need
    418       to fish out the values without converting them.
    419       NOTE: The 32 FP registers map to the first 32 VSX registers.*/
    420 #  define DO(n)  (*fpu)[n] = *(double*)(&arch->vex.guest_VSR##n)
    421    DO(0);  DO(1);  DO(2);  DO(3);  DO(4);  DO(5);  DO(6);  DO(7);
    422    DO(8);  DO(9);  DO(10); DO(11); DO(12); DO(13); DO(14); DO(15);
    423    DO(16); DO(17); DO(18); DO(19); DO(20); DO(21); DO(22); DO(23);
    424    DO(24); DO(25); DO(26); DO(27); DO(28); DO(29); DO(30); DO(31);
    425 #  undef DO
    426 
    427 #elif defined(VGP_ppc64_linux)
    428    /* The guest state has the FPR fields declared as ULongs, so need
    429       to fish out the values without converting them.
    430       NOTE: The 32 FP registers map to the first 32 VSX registers.*/
    431 #  define DO(n)  (*fpu)[n] = *(double*)(&arch->vex.guest_VSR##n)
    432    DO(0);  DO(1);  DO(2);  DO(3);  DO(4);  DO(5);  DO(6);  DO(7);
    433    DO(8);  DO(9);  DO(10); DO(11); DO(12); DO(13); DO(14); DO(15);
    434    DO(16); DO(17); DO(18); DO(19); DO(20); DO(21); DO(22); DO(23);
    435    DO(24); DO(25); DO(26); DO(27); DO(28); DO(29); DO(30); DO(31);
    436 #  undef DO
    437 
    438 #elif defined(VGP_arm_linux)
    439    // umm ...
    440 
    441 #elif defined(VGP_s390x_linux)
    442 #  define DO(n)  fpu->fprs[n].ui = arch->vex.guest_f##n
    443    DO(0);  DO(1);  DO(2);  DO(3);  DO(4);  DO(5);  DO(6);  DO(7);
    444    DO(8);  DO(9);  DO(10); DO(11); DO(12); DO(13); DO(14); DO(15);
    445 # undef DO
    446 #else
    447 #  error Unknown ELF platform
    448 #endif
    449 }
    450 
    451 #if defined(VGP_x86_linux)
    452 static void fill_xfpu(const ThreadState *tst, vki_elf_fpxregset_t *xfpu)
    453 {
    454    ThreadArchState* arch = (ThreadArchState*)&tst->arch;
    455 
    456 //::    xfpu->cwd = ?;
    457 //::    xfpu->swd = ?;
    458 //::    xfpu->twd = ?;
    459 //::    xfpu->fop = ?;
    460 //::    xfpu->fip = ?;
    461 //::    xfpu->fcs = ?;
    462 //::    xfpu->foo = ?;
    463 //::    xfpu->fos = ?;
    464 //::    xfpu->mxcsr = ?;
    465    xfpu->reserved = 0;
    466 //::    xfpu->st_space = ?;
    467 
    468 #  define DO(n)  VG_(memcpy)(xfpu->xmm_space + n * 4, &arch->vex.guest_XMM##n, sizeof(arch->vex.guest_XMM##n))
    469    DO(0);  DO(1);  DO(2);  DO(3);  DO(4);  DO(5);  DO(6);  DO(7);
    470 #  undef DO
    471 
    472    VG_(memset)(xfpu->padding, 0, sizeof(xfpu->padding));
    473 }
    474 #endif
    475 
    476 static
    477 void make_elf_coredump(ThreadId tid, const vki_siginfo_t *si, UInt max_size)
    478 {
    479    Char* buf = NULL;
    480    Char *basename = "vgcore";
    481    Char *coreext = "";
    482    Int seq = 0;
    483    Int core_fd;
    484    NSegment const * seg;
    485    ESZ(Ehdr) ehdr;
    486    ESZ(Phdr) *phdrs;
    487    Int num_phdrs;
    488    Int i, idx;
    489    UInt off;
    490    struct note *notelist, *note;
    491    UInt notesz;
    492    struct vki_elf_prpsinfo prpsinfo;
    493    struct vki_elf_prstatus prstatus;
    494    Addr *seg_starts;
    495    Int n_seg_starts;
    496 
    497    if (VG_(clo_log_fname_expanded) != NULL) {
    498       coreext = ".core";
    499       basename = VG_(expand_file_name)(
    500                     "--log-file (while creating core filename)",
    501                     VG_(clo_log_fname_expanded));
    502    }
    503 
    504    vg_assert(coreext);
    505    vg_assert(basename);
    506    buf = VG_(malloc)( "coredump-elf.mec.1",
    507                       VG_(strlen)(coreext) + VG_(strlen)(basename)
    508                          + 100/*for the two %ds. */ );
    509    vg_assert(buf);
    510 
    511    for(;;) {
    512       Int oflags = VKI_O_CREAT|VKI_O_WRONLY|VKI_O_EXCL|VKI_O_TRUNC;
    513       SysRes sres;
    514 
    515       if (seq == 0)
    516 	 VG_(sprintf)(buf, "%s%s.%d",
    517 		      basename, coreext, VG_(getpid)());
    518       else
    519 	 VG_(sprintf)(buf, "%s%s.%d.%d",
    520 		      basename, coreext, VG_(getpid)(), seq);
    521       seq++;
    522 
    523 #     if defined(VKI_O_LARGEFILE)
    524       oflags |= VKI_O_LARGEFILE;
    525 #     endif
    526 
    527       sres = VG_(open)(buf, oflags, VKI_S_IRUSR|VKI_S_IWUSR);
    528       if (!sr_isError(sres)) {
    529          core_fd = sr_Res(sres);
    530 	 break;
    531       }
    532 
    533       if (sr_isError(sres) && sr_Err(sres) != VKI_EEXIST)
    534 	 return;		/* can't create file */
    535    }
    536 
    537    /* Get the segments */
    538    seg_starts = VG_(get_segment_starts)(&n_seg_starts);
    539 
    540    /* First, count how many memory segments to dump */
    541    num_phdrs = 1;		/* start with notes */
    542    for(i = 0; i < n_seg_starts; i++) {
    543       if (!may_dump(VG_(am_find_nsegment(seg_starts[i]))))
    544 	 continue;
    545 
    546       num_phdrs++;
    547    }
    548 
    549    fill_ehdr(&ehdr, num_phdrs);
    550 
    551    notelist = NULL;
    552 
    553    /* Second, work out their layout */
    554    phdrs = VG_(arena_malloc)(VG_AR_CORE, "coredump-elf.mec.1",
    555                              sizeof(*phdrs) * num_phdrs);
    556 
    557    for(i = 1; i < VG_N_THREADS; i++) {
    558       vki_elf_fpregset_t  fpu;
    559 
    560       if (VG_(threads)[i].status == VgTs_Empty)
    561 	 continue;
    562 
    563 #     if defined(VGP_x86_linux)
    564       {
    565          vki_elf_fpxregset_t xfpu;
    566          fill_xfpu(&VG_(threads)[i], &xfpu);
    567          add_note(&notelist, "LINUX", NT_PRXFPREG, &xfpu, sizeof(xfpu));
    568       }
    569 #     endif
    570 
    571       fill_fpu(&VG_(threads)[i], &fpu);
    572 #     if !defined(VGPV_arm_linux_android) && !defined(VGPV_x86_linux_android)
    573       add_note(&notelist, "CORE", NT_FPREGSET, &fpu, sizeof(fpu));
    574 #     endif
    575 
    576       fill_prstatus(&VG_(threads)[i], &prstatus, si);
    577 #     if !defined(VGPV_arm_linux_android) && !defined(VGPV_x86_linux_android)
    578       add_note(&notelist, "CORE", NT_PRSTATUS, &prstatus, sizeof(prstatus));
    579 #     endif
    580    }
    581 
    582    fill_prpsinfo(&VG_(threads)[tid], &prpsinfo);
    583 #  if !defined(VGPV_arm_linux_android) && !defined(VGPV_x86_linux_android)
    584    add_note(&notelist, "CORE", NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo));
    585 #  endif
    586 
    587    for (note = notelist, notesz = 0; note != NULL; note = note->next)
    588       notesz += note_size(note);
    589 
    590    off = sizeof(ehdr) + sizeof(*phdrs) * num_phdrs;
    591 
    592    phdrs[0].p_type = PT_NOTE;
    593    phdrs[0].p_offset = off;
    594    phdrs[0].p_vaddr = 0;
    595    phdrs[0].p_paddr = 0;
    596    phdrs[0].p_filesz = notesz;
    597    phdrs[0].p_memsz = 0;
    598    phdrs[0].p_flags = 0;
    599    phdrs[0].p_align = 0;
    600 
    601    off += notesz;
    602 
    603    off = VG_PGROUNDUP(off);
    604 
    605    for(i = 0, idx = 1; i < n_seg_starts; i++) {
    606       seg = VG_(am_find_nsegment(seg_starts[i]));
    607 
    608       if (!may_dump(seg))
    609 	 continue;
    610 
    611       fill_phdr(&phdrs[idx], seg, off,
    612                 (seg->end - seg->start + off) < max_size);
    613 
    614       off += phdrs[idx].p_filesz;
    615 
    616       idx++;
    617    }
    618 
    619    /* write everything out */
    620    VG_(write)(core_fd, &ehdr, sizeof(ehdr));
    621    VG_(write)(core_fd, phdrs, sizeof(*phdrs) * num_phdrs);
    622 
    623    for(note = notelist; note != NULL; note = note->next)
    624       write_note(core_fd, note);
    625 
    626    VG_(lseek)(core_fd, phdrs[1].p_offset, VKI_SEEK_SET);
    627 
    628    for(i = 0, idx = 1; i < n_seg_starts; i++) {
    629       seg = VG_(am_find_nsegment(seg_starts[i]));
    630 
    631       if (!should_dump(seg))
    632 	 continue;
    633 
    634       if (phdrs[idx].p_filesz > 0) {
    635 	 vg_assert(VG_(lseek)(core_fd, phdrs[idx].p_offset, VKI_SEEK_SET)
    636                    == phdrs[idx].p_offset);
    637 	 vg_assert(seg->end - seg->start >= phdrs[idx].p_filesz);
    638 
    639 	 (void)VG_(write)(core_fd, (void *)seg->start, phdrs[idx].p_filesz);
    640       }
    641       idx++;
    642    }
    643 
    644    VG_(free)(seg_starts);
    645 
    646    VG_(close)(core_fd);
    647 }
    648 
    649 void VG_(make_coredump)(ThreadId tid, const vki_siginfo_t *si, UInt max_size)
    650 {
    651    make_elf_coredump(tid, si, max_size);
    652 }
    653 
    654 #endif // defined(VGO_linux)
    655 
    656 /*--------------------------------------------------------------------*/
    657 /*--- end                                                          ---*/
    658 /*--------------------------------------------------------------------*/
    659