LCOV - code coverage report
Current view: directory - toolkit/crashreporter/google-breakpad/src/client/linux/minidump_writer - linux_dumper.h (source / functions) Found Hit Coverage
Test: app.info Lines: 4 0 0.0 %
Date: 2012-06-02 Functions: 4 0 0.0 %

       1                 : // Copyright (c) 2009, Google Inc.
       2                 : // All rights reserved.
       3                 : //
       4                 : // Redistribution and use in source and binary forms, with or without
       5                 : // modification, are permitted provided that the following conditions are
       6                 : // met:
       7                 : //
       8                 : //     * Redistributions of source code must retain the above copyright
       9                 : // notice, this list of conditions and the following disclaimer.
      10                 : //     * Redistributions in binary form must reproduce the above
      11                 : // copyright notice, this list of conditions and the following disclaimer
      12                 : // in the documentation and/or other materials provided with the
      13                 : // distribution.
      14                 : //     * Neither the name of Google Inc. nor the names of its
      15                 : // contributors may be used to endorse or promote products derived from
      16                 : // this software without specific prior written permission.
      17                 : //
      18                 : // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      19                 : // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      20                 : // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      21                 : // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      22                 : // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      23                 : // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      24                 : // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      25                 : // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      26                 : // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      27                 : // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      28                 : // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      29                 : 
      30                 : #ifndef CLIENT_LINUX_MINIDUMP_WRITER_LINUX_DUMPER_H_
      31                 : #define CLIENT_LINUX_MINIDUMP_WRITER_LINUX_DUMPER_H_
      32                 : 
      33                 : #include <elf.h>
      34                 : #include <linux/limits.h>
      35                 : #include <stdint.h>
      36                 : #include <sys/types.h>
      37                 : #if !defined(__ANDROID__)
      38                 : #include <sys/user.h>
      39                 : #endif
      40                 : 
      41                 : #include "common/memory.h"
      42                 : #include "google_breakpad/common/minidump_format.h"
      43                 : #include <asm/ptrace.h>
      44                 : 
      45                 : namespace google_breakpad {
      46                 : 
      47                 : #if defined(__i386) || defined(__x86_64)
      48                 : typedef typeof(((struct user*) 0)->u_debugreg[0]) debugreg_t;
      49                 : #endif
      50                 : 
      51                 : // Typedef for our parsing of the auxv variables in /proc/pid/auxv.
      52                 : #if defined(__i386) || defined(__ARM_EABI__)
      53                 : #if !defined(__ANDROID__)
      54                 : typedef Elf32_auxv_t elf_aux_entry;
      55                 : #else
      56                 : // Android is missing this structure definition
      57                 : typedef struct
      58                 : {
      59                 :   uint32_t a_type;              /* Entry type */
      60                 :   union
      61                 :     {
      62                 :       uint32_t a_val;           /* Integer value */
      63                 :     } a_un;
      64                 : } elf_aux_entry;
      65                 : 
      66                 : #if !defined(AT_SYSINFO_EHDR)
      67                 : #define AT_SYSINFO_EHDR 33
      68                 : #endif
      69                 : #endif  // __ANDROID__
      70                 : #elif defined(__x86_64__)
      71                 : typedef Elf64_auxv_t elf_aux_entry;
      72                 : #endif
      73                 : // When we find the VDSO mapping in the process's address space, this
      74                 : // is the name we use for it when writing it to the minidump.
      75                 : // This should always be less than NAME_MAX!
      76                 : const char kLinuxGateLibraryName[] = "linux-gate.so";
      77                 : 
      78                 : // We produce one of these structures for each thread in the crashed process.
      79                 : struct ThreadInfo {
      80                 :   pid_t tid;    // thread id
      81                 :   pid_t tgid;   // thread group id
      82                 :   pid_t ppid;   // parent process
      83                 : 
      84                 :   // Even on platforms where the stack grows down, the following will point to
      85                 :   // the smallest address in the stack.
      86                 :   const void* stack;  // pointer to the stack area
      87                 :   size_t stack_len;  // length of the stack to copy
      88                 : 
      89                 : 
      90                 : #if defined(__i386) || defined(__x86_64)
      91                 :   user_regs_struct regs;
      92                 :   user_fpregs_struct fpregs;
      93                 :   static const unsigned kNumDebugRegisters = 8;
      94                 :   debugreg_t dregs[8];
      95                 : #if defined(__i386)
      96                 :   user_fpxregs_struct fpxregs;
      97                 : #endif  // defined(__i386)
      98                 : 
      99                 : #elif defined(__ARM_EABI__)
     100                 :   // Mimicking how strace does this(see syscall.c, search for GETREGS)
     101                 : #if defined(__ANDROID__)
     102                 :   struct pt_regs regs;
     103                 : #else
     104                 :   struct user_regs regs;
     105                 :   struct user_fpregs fpregs;
     106                 : #endif  // __ANDROID__
     107                 : #endif
     108                 : };
     109                 : 
     110                 : // One of these is produced for each mapping in the process (i.e. line in
     111                 : // /proc/$x/maps).
     112                 : struct MappingInfo {
     113                 :   uintptr_t start_addr;
     114                 :   size_t size;
     115                 :   size_t offset;  // offset into the backed file.
     116                 :   char name[NAME_MAX];
     117                 : };
     118                 : 
     119                 : // Suspend a thread by attaching to it.
     120                 : bool AttachThread(pid_t pid);
     121                 : 
     122                 : // Resume a thread by detaching from it.
     123                 : bool DetachThread(pid_t pid);
     124                 : 
     125                 : // Fill |info| with the register state of |info->tid|.  The thread
     126                 : // must be attached to the calling process.  Return true on success.
     127                 : bool GetThreadRegisters(ThreadInfo* info);
     128                 : 
     129               0 : class LinuxDumper {
     130                 :  public:
     131                 :   explicit LinuxDumper(pid_t pid);
     132                 : 
     133                 :   // Parse the data for |threads| and |mappings|.
     134                 :   bool Init();
     135                 : 
     136                 :   // Attach/detach all threads in the given process.
     137                 :   bool ThreadsAttach();
     138                 :   bool ThreadsDetach();
     139                 : 
     140                 :   // Read information about the given thread. Returns true on success. One must
     141                 :   // have called |ThreadsAttach| first.
     142                 :   bool ThreadInfoGet(ThreadInfo* info);
     143                 : 
     144                 :   // These are only valid after a call to |Init|.
     145               0 :   const wasteful_vector<pid_t> &threads() { return threads_; }
     146               0 :   const wasteful_vector<MappingInfo*> &mappings() { return mappings_; }
     147                 :   const MappingInfo* FindMapping(const void* address) const;
     148                 : 
     149                 :   // Find a block of memory to take as the stack given the top of stack pointer.
     150                 :   //   stack: (output) the lowest address in the memory area
     151                 :   //   stack_len: (output) the length of the memory area
     152                 :   //   stack_top: the current top of the stack
     153                 :   bool GetStackInfo(const void** stack, size_t* stack_len, uintptr_t stack_top);
     154                 : 
     155               0 :   PageAllocator* allocator() { return &allocator_; }
     156                 : 
     157                 :   // memcpy from a remote process.
     158                 :   static void CopyFromProcess(void* dest, pid_t child, const void* src,
     159                 :                               size_t length);
     160                 : 
     161                 :   // Builds a proc path for a certain pid for a node.  path is a
     162                 :   // character array that is overwritten, and node is the final node
     163                 :   // without any slashes.
     164                 :   void BuildProcPath(char* path, pid_t pid, const char* node) const;
     165                 : 
     166                 :   // Generate a File ID from the .text section of a mapped entry
     167                 :   bool ElfFileIdentifierForMapping(const MappingInfo& mapping,
     168                 :                                    uint8_t identifier[sizeof(MDGUID)]);
     169                 : 
     170                 :   // Utility method to find the location of where the kernel has
     171                 :   // mapped linux-gate.so in memory(shows up in /proc/pid/maps as
     172                 :   // [vdso], but we can't guarantee that it's the only virtual dynamic
     173                 :   // shared object.  Parsing the auxilary vector for AT_SYSINFO_EHDR
     174                 :   // is the safest way to go.)
     175                 :   void* FindBeginningOfLinuxGateSharedLibrary(const pid_t pid) const;
     176                 :  private:
     177                 :   bool EnumerateMappings(wasteful_vector<MappingInfo*>* result) const;
     178                 :   bool EnumerateThreads(wasteful_vector<pid_t>* result) const;
     179                 : 
     180                 :   const pid_t pid_;
     181                 : 
     182                 :   mutable PageAllocator allocator_;
     183                 : 
     184                 :   bool threads_suspended_;
     185                 :   wasteful_vector<pid_t> threads_;  // the ids of all the threads
     186                 :   wasteful_vector<MappingInfo*> mappings_;  // info from /proc/<pid>/maps
     187                 : };
     188                 : 
     189                 : }  // namespace google_breakpad
     190                 : 
     191                 : #endif  // CLIENT_LINUX_HANDLER_LINUX_DUMPER_H_

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