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1 
2 /*--------------------------------------------------------------------*/
3 /*--- User-mode execve.                             pub_core_ume.h ---*/
4 /*--------------------------------------------------------------------*/
5 
6 /*
7    This file is part of Valgrind, a dynamic binary instrumentation
8    framework.
9 
10    Copyright (C) 2000-2012 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_UME_H
32 #define __PUB_CORE_UME_H
33 
34 //--------------------------------------------------------------------
35 // PURPOSE: This module implements user-mode execve, ie. program loading
36 // and exec'ing.
37 //--------------------------------------------------------------------
38 
39 /*------------------------------------------------------------*/
40 /*--- Loading files                                        ---*/
41 /*------------------------------------------------------------*/
42 
43 // Info needed to load and run a program.  IN/INOUT/OUT refers to the
44 // inputs/outputs of do_exec().
45 typedef
46    struct {
47       HChar** argv;       // IN: the original argv
48 
49       Addr exe_base;     // INOUT: lowest (allowed) address of exe
50       Addr exe_end;      // INOUT: highest (allowed) address
51 
52 #if !defined(VGO_darwin)
53       Addr phdr;         // OUT: address phdr was mapped at
54       Int  phnum;        // OUT: number of phdrs
55       Addr interp_base;  // OUT: where interpreter (ld.so) was mapped
56 #else
57       Addr  stack_start;      // OUT: address of start of stack segment (hot)
58       Addr  stack_end;        // OUT: address of end of stack segment (cold)
59       Addr  text;             // OUT: address of executable's Mach header
60       Bool  dynamic;          // OUT: False iff executable is static
61       char* executable_path;  // OUT: path passed to execve()
62 #endif
63 
64       Addr entry;        // OUT: entrypoint in main executable
65       Addr init_ip;      // OUT: address of first instruction to execute
66       Addr brkbase;      // OUT: base address of brk segment
67       Addr init_toc;     // OUT: address of table-of-contents, on
68                          // platforms for which that makes sense
69                          // (ppc64-linux only)
70 
71       // These are the extra args added by #! scripts
72       HChar*  interp_name;  // OUT: the interpreter name
73       HChar*  interp_args;  // OUT: the args for the interpreter
74    }
75    ExeInfo;
76 
77 // Do a number of appropriate checks to see if the file looks executable by
78 // the kernel: ie. it's a file, it's readable and executable, and it's in
79 // either binary or "#!" format.  On success, 'out_fd' gets the fd of the file
80 // if it's non-NULL.  Otherwise the fd is closed.
81 extern SysRes VG_(pre_exec_check)(const HChar* exe_name, Int* out_fd,
82                                   Bool allow_setuid);
83 
84 // Does everything short of actually running 'exe': finds the file,
85 // checks execute permissions, sets up interpreter if program is a script,
86 // reads headers, maps file into memory, and returns important info about
87 // the program.
88 extern Int VG_(do_exec)(const HChar* exe, ExeInfo* info);
89 
90 #endif /* __PUB_CORE_UME_H */
91 
92 /*--------------------------------------------------------------------*/
93 /*--- end                                                          ---*/
94 /*--------------------------------------------------------------------*/
95