coregrind/pub_core_clientstate.h

   1
   2 /*--------------------------------------------------------------------*/
   3 /*--- Misc client state info                pub_core_clientstate.h ---*/
   4 /*--------------------------------------------------------------------*/
   5
   6 /*
   7    This file is part of Valgrind, a dynamic binary instrumentation
   8    framework.
   9
  10    Copyright (C) 2000-2013 Julian Seward
  11       jseward@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 #ifndef __PUB_CORE_CLIENTSTATE_H
  32 #define __PUB_CORE_CLIENTSTATE_H
  33
  34 //--------------------------------------------------------------------
  35 // PURPOSE: This module holds various bits of client state which don't
  36 // live comfortably anywhere else.  Note that the ThreadStates for the
  37 // client don't live here; they instead live in m_threadstate.h.  Most
  38 // of these values are set once at startup and not changed later.
  39 //--------------------------------------------------------------------
  40
  41 #include "pub_tool_clientstate.h"
  42
  43 // Address space globals
  44
  45 // client stack range
  46 extern Addr  VG_(clstk_start_base); // *Initial* lowest byte address
  47 extern Addr  VG_(clstk_end);        // Highest byte address
  48 extern UWord VG_(clstk_id);      // client stack id
  49
  50 /* linux only: where is the client auxv ? */
  51 /* This is setup as part of setup_client_stack in initimg-linux.c. */
  52 extern UWord* VG_(client_auxv);
  53
  54 extern Addr  VG_(brk_base);      // start of brk
  55 extern Addr  VG_(brk_limit);     // current brk
  56
  57 /* A fd which refers to the client executable. */
  58 extern Int VG_(cl_exec_fd);
  59
  60 /* A fd which refers to the fake /proc/<pid>/cmdline in /tmp.  The
  61    idea is: make up the /proc/<pid>/cmdline file the client would
  62    expect to see if it was running natively.  Copy into a file in
  63    /tmp.  When the client then does an open of /proc/<pid>/cmdline or
  64    /proc/self/cmdline, instead give it a file handle to the file in
  65    /tmp.  The problem of deleting said file when Valgrind exits is
  66    neatly sidestepped by unlinking it as soon as it has been created,
  67    but holding on to the file handle.  That causes the kernel to keep
  68    the file contents alive exactly until the process exits. */
  69 extern Int VG_(cl_cmdline_fd);
  70
  71 /* Same as above, but for /proc/<pid>/auxv. */
  72 extern Int VG_(cl_auxv_fd);
  73
  74 // Client's original rlimit data and rlimit stack
  75 extern struct vki_rlimit VG_(client_rlimit_data);
  76 extern struct vki_rlimit VG_(client_rlimit_stack);
  77
  78 // Name of the launcher, as extracted from VALGRIND_LAUNCHER at
  79 // startup.
  80 extern HChar* VG_(name_of_launcher);
  81
  82 /* Application-visible file descriptor limits */
  83 extern Int VG_(fd_soft_limit);
  84 extern Int VG_(fd_hard_limit);
  85
  86 /* Useful addresses extracted from the client */
  87 /* Where is the __libc_freeres_wrapper routine we made? */
  88 extern Addr VG_(client___libc_freeres_wrapper);
  89
  90 /* x86-linux only: where is ld.so's _dl_sysinfo_int80 function?
  91    Finding it isn't essential, but knowing where it is does sometimes
  92    help produce better back traces.  See big comment in
  93    VG_(get_StackTrace) in m_stacktrace.c for further info. */
  94 extern Addr VG_(client__dl_sysinfo_int80);
  95
  96
  97 /* glibc nptl pthread systems only, when no-nptl-pthread-stackcache
  98    was given in --sim-hints.
  99    Used for a (kludgy) way to disable the cache of stacks as implemented in
 100    nptl glibc.
 101    Based on internal knowledge of the pthread glibc nptl/allocatestack.c code:
 102    a huge value in stack_cache_actsize (bigger than the constant
 103    stack_cache_maxsize) makes glibc believes the cache is full
 104    and so stacks are always released when a pthread terminates.
 105    Several ugliness in this kludge:
 106     * hardcodes private glibc var name "stack_cache_maxsize"
 107     * based on knowledge of the code of the functions
 108       queue_stack and __free_stacks
 109     * static symbol for "stack_cache_maxsize" must be in
 110       the debug info.
 111    It would be much cleaner to have a documented and supported
 112    way to disable the pthread stack cache. */
 113 extern SizeT* VG_(client__stack_cache_actsize__addr);
 114
 115 #endif   // __PUB_CORE_CLIENTSTATE_H
 116
 117 /*--------------------------------------------------------------------*/
 118 /*--- end                                                          ---*/
 119 /*--------------------------------------------------------------------*/