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-// Copyright (c) 2009, Google Inc.
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef CLIENT_LINUX_HANDLER_LINUX_DUMPER_H_
-#define CLIENT_LINUX_HANDLER_LINUX_DUMPER_H_
-
-#include <sys/types.h>
-#include <elf.h>
-#include <stdint.h>
-#include <sys/user.h>
-#include <linux/limits.h>
-
-#include "breakpad/linux/memory.h"
-
-namespace google_breakpad {
-
-typedef typeof(((struct user*) 0)->u_debugreg[0]) debugreg_t;
-
-// Typedef for our parsing of the auxv variables in /proc/pid/auxv.
-#if defined(__i386)
-typedef Elf32_auxv_t elf_aux_entry;
-#elif defined(__x86_64__)
-typedef Elf64_auxv_t elf_aux_entry;
-#endif
-// When we find the VDSO mapping in the process's address space, this
-// is the name we use for it when writing it to the minidump.
-// This should always be less than NAME_MAX!
-const char kLinuxGateLibraryName[] = "linux-gate.so";
-
-// We produce one of these structures for each thread in the crashed process.
-struct ThreadInfo {
- pid_t tgid; // thread group id
- pid_t ppid; // parent process
-
- // Even on platforms where the stack grows down, the following will point to
- // the smallest address in the stack.
- const void* stack; // pointer to the stack area
- size_t stack_len; // length of the stack to copy
-
- user_regs_struct regs;
- user_fpregs_struct fpregs;
-#if defined(__i386)
- user_fpxregs_struct fpxregs;
-#endif
-
-#if defined(__i386) || defined(__x86_64)
- static const unsigned kNumDebugRegisters = 8;
- debugreg_t dregs[8];
-#endif
-};
-
-// One of these is produced for each mapping in the process (i.e. line in
-// /proc/$x/maps).
-struct MappingInfo {
- uintptr_t start_addr;
- size_t size;
- size_t offset; // offset into the backed file.
- char name[NAME_MAX];
-};
-
-class LinuxDumper {
- public:
- explicit LinuxDumper(pid_t pid);
-
- // Parse the data for |threads| and |mappings|.
- bool Init();
-
- // Suspend/resume all threads in the given process.
- bool ThreadsSuspend();
- bool ThreadsResume();
-
- // Read information about the given thread. Returns true on success. One must
- // have called |ThreadsSuspend| first.
- bool ThreadInfoGet(pid_t tid, ThreadInfo* info);
-
- // These are only valid after a call to |Init|.
- const wasteful_vector<pid_t> &threads() { return threads_; }
- const wasteful_vector<MappingInfo*> &mappings() { return mappings_; }
- const MappingInfo* FindMapping(const void* address) const;
-
- // Find a block of memory to take as the stack given the top of stack pointer.
- // stack: (output) the lowest address in the memory area
- // stack_len: (output) the length of the memory area
- // stack_top: the current top of the stack
- bool GetStackInfo(const void** stack, size_t* stack_len, uintptr_t stack_top);
-
- PageAllocator* allocator() { return &allocator_; }
-
- // memcpy from a remote process.
- static void CopyFromProcess(void* dest, pid_t child, const void* src,
- size_t length);
-
- // Builds a proc path for a certain pid for a node. path is a
- // character array that is overwritten, and node is the final node
- // without any slashes.
- void BuildProcPath(char* path, pid_t pid, const char* node) const;
-
- // Utility method to find the location of where the kernel has
- // mapped linux-gate.so in memory(shows up in /proc/pid/maps as
- // [vdso], but we can't guarantee that it's the only virtual dynamic
- // shared object. Parsing the auxilary vector for AT_SYSINFO_EHDR
- // is the safest way to go.)
- void* FindBeginningOfLinuxGateSharedLibrary(const pid_t pid) const;
- private:
- bool EnumerateMappings(wasteful_vector<MappingInfo*>* result) const;
- bool EnumerateThreads(wasteful_vector<pid_t>* result) const;
-
- const pid_t pid_;
-
- mutable PageAllocator allocator_;
-
- bool threads_suspened_;
- wasteful_vector<pid_t> threads_; // the ids of all the threads
- wasteful_vector<MappingInfo*> mappings_; // info from /proc/<pid>/maps
-};
-
-} // namespace google_breakpad
-
-#endif // CLIENT_LINUX_HANDLER_LINUX_DUMPER_H_