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      1 
      2 /*--------------------------------------------------------------------*/
      3 /*--- A home for miscellaneous bits of information which pertain   ---*/
      4 /*--- to the client's state.                                       ---*/
      5 /*---                                              m_clientstate.c ---*/
      6 /*--------------------------------------------------------------------*/
      7 
      8 /*
      9    This file is part of Valgrind, a dynamic binary instrumentation
     10    framework.
     11 
     12    Copyright (C) 2000-2015 Julian Seward
     13       jseward (at) acm.org
     14 
     15    This program is free software; you can redistribute it and/or
     16    modify it under the terms of the GNU General Public License as
     17    published by the Free Software Foundation; either version 2 of the
     18    License, or (at your option) any later version.
     19 
     20    This program is distributed in the hope that it will be useful, but
     21    WITHOUT ANY WARRANTY; without even the implied warranty of
     22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     23    General Public License for more details.
     24 
     25    You should have received a copy of the GNU General Public License
     26    along with this program; if not, write to the Free Software
     27    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     28    02111-1307, USA.
     29 
     30    The GNU General Public License is contained in the file COPYING.
     31 */
     32 
     33 #include "pub_core_basics.h"
     34 #include "pub_core_vki.h"
     35 #include "pub_core_xarray.h"
     36 #include "pub_core_clientstate.h"
     37 
     38 /*-----------------------------------------------------------------*/
     39 /*---                                                           ---*/
     40 /*--- Basic globals about the address space.                    ---*/
     41 /*---                                                           ---*/
     42 /*-----------------------------------------------------------------*/
     43 
     44 /* Client address space, lowest to highest (see top of ume.c) */
     45 // TODO: get rid of as many of these as possible.
     46 
     47 /* ***Initial*** lowest address of the stack segment of the main thread.
     48    The main stack will grow if needed but VG_(clstk_start_base) will
     49    not be changed according to the growth. */
     50 Addr  VG_(clstk_start_base)  = 0;
     51 /* Initial highest address of the stack segment of the main thread. */
     52 Addr  VG_(clstk_end)   = 0;
     53 UWord VG_(clstk_id)    = 0;
     54 /* Maximum size of the main thread's client stack. */
     55 SizeT VG_(clstk_max_size) = 0;
     56 
     57 /* Solaris and Linux only, specifies where the client auxv is.
     58 
     59    This is set up as part of setup_client_stack() in
     60    initimg-{linux,solaris}.c. */
     61 UWord* VG_(client_auxv) = NULL;
     62 
     63 Addr  VG_(brk_base)    = 0;       /* start of brk */
     64 Addr  VG_(brk_limit)   = 0;       /* current brk */
     65 
     66 /* A fd which refers to the client executable. */
     67 Int VG_(cl_exec_fd) = -1;
     68 
     69 /* A fd which refers to the fake /proc/<pid>/cmdline in /tmp. */
     70 Int VG_(cl_cmdline_fd) = -1;
     71 
     72 /* A fd which refers to the fake /proc/<pid>/auxv in /tmp. */
     73 Int VG_(cl_auxv_fd) = -1;
     74 
     75 #if defined(VGO_solaris)
     76 /* A fd which refers to the fake /proc/<pid>/psinfo in /tmp. */
     77 Int VG_(cl_psinfo_fd) = -1;
     78 #endif /* VGO_solaris */
     79 
     80 // Command line pieces, after they have been extracted from argv in
     81 // m_main.main().  The payload vectors are allocated in VG_AR_CORE
     82 // (the default arena).  They are never freed.
     83 
     84 /* Args for the client. */
     85 XArray* /* of HChar* */ VG_(args_for_client) = NULL;
     86 
     87 /* Args for V (augments, then those from the launcher). */
     88 XArray* /* of HChar* */ VG_(args_for_valgrind) = NULL;
     89 
     90 /* How many of the above not to pass on at execve time? */
     91 Int VG_(args_for_valgrind_noexecpass) = 0;
     92 
     93 /* The name of the client executable, as specified on the command
     94    line. */
     95 const HChar* VG_(args_the_exename) = NULL;
     96 
     97 // Client's original rlimit data and rlimit stack
     98 struct vki_rlimit VG_(client_rlimit_data);
     99 struct vki_rlimit VG_(client_rlimit_stack);
    100 
    101 // Name of the launcher, as extracted from VALGRIND_LAUNCHER at
    102 // startup.
    103 HChar* VG_(name_of_launcher) = NULL;
    104 
    105 /* Application-visible file descriptor limits */
    106 Int VG_(fd_soft_limit) = -1;
    107 Int VG_(fd_hard_limit) = -1;
    108 
    109 /* Useful addresses extracted from the client */
    110 /* Where is the __libc_freeres_wrapper routine we made? */
    111 Addr VG_(client___libc_freeres_wrapper) = 0;
    112 
    113 /* x86-linux only: where is glibc's _dl_sysinfo_int80 function?
    114    Finding it isn't essential, but knowing where it is does sometimes
    115    help produce better back traces.  See big comment in
    116    VG_(get_StackTrace) in m_stacktrace.c for further info. */
    117 Addr VG_(client__dl_sysinfo_int80) = 0;
    118 
    119 /* Address of the (internal) glibc nptl pthread stack cache size,
    120    declared as:
    121       static size_t stack_cache_actsize;
    122    in nptl/allocatestack.c */
    123 SizeT* VG_(client__stack_cache_actsize__addr) = 0;
    124 
    125 #if defined(VGO_solaris)
    126 /* Address of variable vg_vfork_fildes in vgpreload_core.so.0
    127    (vg_preloaded.c). */
    128 Int* VG_(vfork_fildes_addr) = 0;
    129 #endif
    130 
    131 /*--------------------------------------------------------------------*/
    132 /*--- end                                                          ---*/
    133 /*--------------------------------------------------------------------*/
    134