| |
| /*--------------------------------------------------------------------*/ |
| /*--- Dumping core. coredump-elf.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2000-2009 Julian Seward |
| jseward@acm.org |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| #include "pub_core_basics.h" |
| #include "pub_core_vki.h" |
| #include "pub_core_aspacemgr.h" |
| #include "pub_core_libcbase.h" |
| #include "pub_core_machine.h" |
| #include "pub_core_coredump.h" |
| #include "pub_core_libcprint.h" |
| #include "pub_core_libcfile.h" // VG_(close) et al |
| #include "pub_core_libcproc.h" // VG_(geteuid), VG_(getegid) |
| #include "pub_core_libcassert.h" // VG_(exit), vg_assert |
| #include "pub_core_mallocfree.h" // VG_(malloc), VG_(free) |
| #include "pub_core_threadstate.h" |
| #include "pub_core_xarray.h" |
| #include "pub_core_clientstate.h" |
| #include "pub_core_options.h" |
| |
| #include "priv_elf.h" |
| |
| /* |
| Dump core |
| |
| Generate a standard ELF core file corresponding to the client state |
| at the time of a crash. |
| */ |
| #include <elf.h> |
| #ifndef NT_PRXFPREG |
| #define NT_PRXFPREG 0x46e62b7f /* copied from gdb5.1/include/elf/common.h */ |
| #endif /* NT_PRXFPREG */ |
| |
| #if VG_WORDSIZE == 8 |
| #define ESZ(x) Elf64_##x |
| #elif VG_WORDSIZE == 4 |
| #define ESZ(x) Elf32_##x |
| #else |
| #error VG_WORDSIZE needs to ==4 or ==8 |
| #endif |
| |
| /* TODO: GIVE THIS A PROPER HOME |
| TODO: MERGE THIS WITH DUPLICATES IN m_main.c and mc_leakcheck.c |
| Extract from aspacem a vector of the current segment start |
| addresses. The vector is dynamically allocated and should be freed |
| by the caller when done. REQUIRES m_mallocfree to be running. |
| Writes the number of addresses required into *n_acquired. */ |
| |
| static Addr* get_seg_starts ( /*OUT*/Int* n_acquired ) |
| { |
| Addr* starts; |
| Int n_starts, r = 0; |
| |
| n_starts = 1; |
| while (True) { |
| starts = VG_(malloc)( "coredump-elf.gss.1", n_starts * sizeof(Addr) ); |
| if (starts == NULL) |
| break; |
| r = VG_(am_get_segment_starts)( starts, n_starts ); |
| if (r >= 0) |
| break; |
| VG_(free)(starts); |
| n_starts *= 2; |
| } |
| |
| if (starts == NULL) { |
| *n_acquired = 0; |
| return NULL; |
| } |
| |
| *n_acquired = r; |
| return starts; |
| } |
| |
| /* If true, then this Segment may be mentioned in the core */ |
| static Bool may_dump(const NSegment *seg) |
| { |
| if (seg->kind == SkAnonC || |
| seg->kind == SkShmC || |
| (seg->kind == SkFileC && |
| !VKI_S_ISCHR(seg->mode) && !VKI_S_ISBLK(seg->mode))) |
| return True; |
| |
| return False; |
| } |
| |
| /* If true, then this Segment's contents will be in the core */ |
| static Bool should_dump(const NSegment *seg) |
| { |
| return may_dump(seg); // && seg->hasW; |
| } |
| |
| static void fill_ehdr(ESZ(Ehdr) *ehdr, Int num_phdrs) |
| { |
| VG_(memset)(ehdr, 0, sizeof(*ehdr)); |
| |
| VG_(memcpy)(ehdr->e_ident, ELFMAG, SELFMAG); |
| ehdr->e_ident[EI_CLASS] = VG_ELF_CLASS; |
| ehdr->e_ident[EI_DATA] = VG_ELF_DATA2XXX; |
| ehdr->e_ident[EI_VERSION] = EV_CURRENT; |
| |
| ehdr->e_type = ET_CORE; |
| ehdr->e_machine = VG_ELF_MACHINE; |
| ehdr->e_version = EV_CURRENT; |
| ehdr->e_entry = 0; |
| ehdr->e_phoff = sizeof(ESZ(Ehdr)); |
| ehdr->e_shoff = 0; |
| ehdr->e_flags = 0; |
| ehdr->e_ehsize = sizeof(ESZ(Ehdr)); |
| ehdr->e_phentsize = sizeof(ESZ(Phdr)); |
| ehdr->e_phnum = num_phdrs; |
| ehdr->e_shentsize = 0; |
| ehdr->e_shnum = 0; |
| ehdr->e_shstrndx = 0; |
| |
| } |
| |
| static void fill_phdr(ESZ(Phdr) *phdr, const NSegment *seg, UInt off, Bool write) |
| { |
| SizeT len = seg->end - seg->start; |
| |
| write = write && should_dump(seg); |
| |
| VG_(memset)(phdr, 0, sizeof(*phdr)); |
| |
| phdr->p_type = PT_LOAD; |
| phdr->p_offset = off; |
| phdr->p_vaddr = seg->start; |
| phdr->p_paddr = 0; |
| phdr->p_filesz = write ? len : 0; |
| phdr->p_memsz = len; |
| phdr->p_flags = 0; |
| |
| if (seg->hasR) |
| phdr->p_flags |= PF_R; |
| if (seg->hasW) |
| phdr->p_flags |= PF_W; |
| if (seg->hasX) |
| phdr->p_flags |= PF_X; |
| |
| phdr->p_align = VKI_PAGE_SIZE; |
| } |
| |
| struct note { |
| struct note *next; |
| ESZ(Nhdr) note; |
| Char name[0]; |
| }; |
| |
| static UInt note_size(const struct note *n) |
| { |
| return sizeof(ESZ(Nhdr)) + VG_ROUNDUP(VG_(strlen)(n->name)+1, 4) + VG_ROUNDUP(n->note.n_descsz, 4); |
| } |
| |
| static void add_note(struct note **list, const Char *name, UInt type, const void *data, UInt datasz) |
| { |
| Int namelen = VG_(strlen)(name)+1; |
| Int notelen = sizeof(struct note) + |
| VG_ROUNDUP(namelen, 4) + |
| VG_ROUNDUP(datasz, 4); |
| struct note *n = VG_(arena_malloc)(VG_AR_CORE, "coredump-elf.an.1", notelen); |
| |
| VG_(memset)(n, 0, notelen); |
| |
| n->next = *list; |
| *list = n; |
| |
| n->note.n_type = type; |
| n->note.n_namesz = namelen; |
| n->note.n_descsz = datasz; |
| |
| VG_(memcpy)(n->name, name, namelen); |
| VG_(memcpy)(n->name+VG_ROUNDUP(namelen,4), data, datasz); |
| } |
| |
| static void write_note(Int fd, const struct note *n) |
| { |
| VG_(write)(fd, &n->note, note_size(n)); |
| } |
| |
| static void fill_prpsinfo(const ThreadState *tst, struct vki_elf_prpsinfo *prpsinfo) |
| { |
| static Char name[VKI_PATH_MAX]; |
| |
| VG_(memset)(prpsinfo, 0, sizeof(*prpsinfo)); |
| |
| switch(tst->status) { |
| case VgTs_Runnable: |
| case VgTs_Yielding: |
| prpsinfo->pr_sname = 'R'; |
| break; |
| |
| case VgTs_WaitSys: |
| prpsinfo->pr_sname = 'S'; |
| break; |
| |
| case VgTs_Zombie: |
| prpsinfo->pr_sname = 'Z'; |
| break; |
| |
| case VgTs_Empty: |
| case VgTs_Init: |
| prpsinfo->pr_sname = '?'; |
| break; |
| } |
| |
| prpsinfo->pr_uid = 0; |
| prpsinfo->pr_gid = 0; |
| |
| if (VG_(resolve_filename)(VG_(cl_exec_fd), name, VKI_PATH_MAX)) { |
| Char *n = name+VG_(strlen)(name)-1; |
| |
| while (n > name && *n != '/') |
| n--; |
| if (n != name) |
| n++; |
| |
| VG_(strncpy)(prpsinfo->pr_fname, n, sizeof(prpsinfo->pr_fname)); |
| } |
| } |
| |
| static void fill_prstatus(const ThreadState *tst, |
| struct vki_elf_prstatus *prs, |
| const vki_siginfo_t *si) |
| { |
| struct vki_user_regs_struct *regs; |
| |
| VG_(memset)(prs, 0, sizeof(*prs)); |
| |
| prs->pr_info.si_signo = si->si_signo; |
| prs->pr_info.si_code = si->si_code; |
| prs->pr_info.si_errno = 0; |
| |
| prs->pr_cursig = si->si_signo; |
| |
| prs->pr_pid = tst->os_state.lwpid; |
| prs->pr_ppid = 0; |
| prs->pr_pgrp = VG_(getpgrp)(); |
| prs->pr_sid = VG_(getpgrp)(); |
| |
| regs = (struct vki_user_regs_struct *)prs->pr_reg; |
| |
| vg_assert(sizeof(*regs) == sizeof(prs->pr_reg)); |
| |
| ML_(fill_elfregs_from_tst)(regs, &tst->arch); |
| } |
| |
| static void fill_fpu(const ThreadState *tst, vki_elf_fpregset_t *fpu) |
| { |
| ML_(fill_elffpregs_from_tst)(fpu, &tst->arch); |
| } |
| |
| #if defined(VGP_x86_linux) |
| static void fill_xfpu(const ThreadState *tst, vki_elf_fpxregset_t *xfpu) |
| { |
| ML_(fill_elffpxregs_from_tst)(xfpu, &tst->arch); |
| } |
| #endif |
| |
| static |
| void make_elf_coredump(ThreadId tid, const vki_siginfo_t *si, UInt max_size) |
| { |
| Char* buf = NULL; |
| Char *basename = "vgcore"; |
| Char *coreext = ""; |
| Int seq = 0; |
| Int core_fd; |
| NSegment const * seg; |
| ESZ(Ehdr) ehdr; |
| ESZ(Phdr) *phdrs; |
| Int num_phdrs; |
| Int i, idx; |
| UInt off; |
| struct note *notelist, *note; |
| UInt notesz; |
| struct vki_elf_prpsinfo prpsinfo; |
| struct vki_elf_prstatus prstatus; |
| Addr *seg_starts; |
| Int n_seg_starts; |
| |
| if (VG_(clo_log_name) != NULL) { |
| coreext = ".core"; |
| basename = VG_(expand_file_name)( |
| "--log-file (while creating core filename)", |
| VG_(clo_log_name)); |
| } |
| |
| vg_assert(coreext); |
| vg_assert(basename); |
| buf = VG_(malloc)( "coredump-elf.mec.1", |
| VG_(strlen)(coreext) + VG_(strlen)(basename) |
| + 100/*for the two %ds. */ ); |
| vg_assert(buf); |
| |
| for(;;) { |
| SysRes sres; |
| |
| if (seq == 0) |
| VG_(sprintf)(buf, "%s%s.%d", |
| basename, coreext, VG_(getpid)()); |
| else |
| VG_(sprintf)(buf, "%s%s.%d.%d", |
| basename, coreext, VG_(getpid)(), seq); |
| seq++; |
| |
| sres = VG_(open)(buf, |
| VKI_O_CREAT|VKI_O_WRONLY|VKI_O_EXCL|VKI_O_TRUNC, |
| VKI_S_IRUSR|VKI_S_IWUSR); |
| if (!sres.isError) { |
| core_fd = sres.res; |
| break; |
| } |
| |
| if (sres.isError && sres.err != VKI_EEXIST) |
| return; /* can't create file */ |
| } |
| |
| /* Get the segments */ |
| seg_starts = get_seg_starts(&n_seg_starts); |
| |
| /* First, count how many memory segments to dump */ |
| num_phdrs = 1; /* start with notes */ |
| for(i = 0; i < n_seg_starts; i++) { |
| if (!may_dump(VG_(am_find_nsegment(seg_starts[i])))) |
| continue; |
| |
| num_phdrs++; |
| } |
| |
| fill_ehdr(&ehdr, num_phdrs); |
| |
| notelist = NULL; |
| |
| /* Second, work out their layout */ |
| phdrs = VG_(arena_malloc)(VG_AR_CORE, "coredump-elf.mec.1", |
| sizeof(*phdrs) * num_phdrs); |
| |
| for(i = 1; i < VG_N_THREADS; i++) { |
| vki_elf_fpregset_t fpu; |
| #if defined(VGP_x86_linux) |
| vki_elf_fpxregset_t xfpu; |
| #endif |
| |
| if (VG_(threads)[i].status == VgTs_Empty) |
| continue; |
| |
| #if defined(VGP_x86_linux) |
| fill_xfpu(&VG_(threads)[i], &xfpu); |
| add_note(¬elist, "LINUX", NT_PRXFPREG, &xfpu, sizeof(xfpu)); |
| #endif |
| |
| fill_fpu(&VG_(threads)[i], &fpu); |
| add_note(¬elist, "CORE", NT_FPREGSET, &fpu, sizeof(fpu)); |
| |
| fill_prstatus(&VG_(threads)[i], &prstatus, si); |
| add_note(¬elist, "CORE", NT_PRSTATUS, &prstatus, sizeof(prstatus)); |
| } |
| |
| fill_prpsinfo(&VG_(threads)[tid], &prpsinfo); |
| add_note(¬elist, "CORE", NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo)); |
| |
| for(note = notelist, notesz = 0; note != NULL; note = note->next) |
| notesz += note_size(note); |
| |
| off = sizeof(ehdr) + sizeof(*phdrs) * num_phdrs; |
| |
| phdrs[0].p_type = PT_NOTE; |
| phdrs[0].p_offset = off; |
| phdrs[0].p_vaddr = 0; |
| phdrs[0].p_paddr = 0; |
| phdrs[0].p_filesz = notesz; |
| phdrs[0].p_memsz = 0; |
| phdrs[0].p_flags = 0; |
| phdrs[0].p_align = 0; |
| |
| off += notesz; |
| |
| off = VG_PGROUNDUP(off); |
| |
| for(i = 0, idx = 1; i < n_seg_starts; i++) { |
| seg = VG_(am_find_nsegment(seg_starts[i])); |
| |
| if (!may_dump(seg)) |
| continue; |
| |
| fill_phdr(&phdrs[idx], seg, off, (seg->end - seg->start + off) < max_size); |
| |
| off += phdrs[idx].p_filesz; |
| |
| idx++; |
| } |
| |
| /* write everything out */ |
| VG_(write)(core_fd, &ehdr, sizeof(ehdr)); |
| VG_(write)(core_fd, phdrs, sizeof(*phdrs) * num_phdrs); |
| |
| for(note = notelist; note != NULL; note = note->next) |
| write_note(core_fd, note); |
| |
| VG_(lseek)(core_fd, phdrs[1].p_offset, VKI_SEEK_SET); |
| |
| for(i = 0, idx = 1; i < n_seg_starts; i++) { |
| seg = VG_(am_find_nsegment(seg_starts[i])); |
| |
| if (!should_dump(seg)) |
| continue; |
| |
| if (phdrs[idx].p_filesz > 0) { |
| Int ret; |
| |
| vg_assert(VG_(lseek)(core_fd, phdrs[idx].p_offset, VKI_SEEK_SET) == phdrs[idx].p_offset); |
| vg_assert(seg->end - seg->start >= phdrs[idx].p_filesz); |
| |
| ret = VG_(write)(core_fd, (void *)seg->start, phdrs[idx].p_filesz); |
| } |
| idx++; |
| } |
| |
| VG_(free)(seg_starts); |
| |
| VG_(close)(core_fd); |
| } |
| |
| void VG_(make_coredump)(ThreadId tid, const vki_siginfo_t *si, UInt max_size) |
| { |
| make_elf_coredump(tid, si, max_size); |
| } |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end ---*/ |
| /*--------------------------------------------------------------------*/ |