| |
| /*--------------------------------------------------------------------*/ |
| /*--- A simple parser for /proc/self/maps on Linux 2.4.X ---*/ |
| /*--- vg_procselfmaps.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2000-2005 Julian Seward |
| jseward@acm.org |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| |
| #include "core.h" |
| |
| /* Size of a smallish table used to read /proc/self/map entries. */ |
| #define M_PROCMAP_BUF 50000 |
| |
| /* static ... to keep it out of the stack frame. */ |
| static Char procmap_buf[M_PROCMAP_BUF]; |
| |
| /* Records length of /proc/self/maps read into procmap_buf. */ |
| static Int buf_n_tot; |
| |
| |
| /* Helper fns. */ |
| |
| static Int hexdigit ( Char c ) |
| { |
| if (c >= '0' && c <= '9') return (Int)(c - '0'); |
| if (c >= 'a' && c <= 'f') return 10 + (Int)(c - 'a'); |
| if (c >= 'A' && c <= 'F') return 10 + (Int)(c - 'A'); |
| return -1; |
| } |
| |
| static Int decdigit ( Char c ) |
| { |
| if (c >= '0' && c <= '9') return (Int)(c - '0'); |
| return -1; |
| } |
| |
| static Int readchar ( const Char* buf, Char* ch ) |
| { |
| if (*buf == 0) return 0; |
| *ch = *buf; |
| return 1; |
| } |
| |
| static Int readhex ( const Char* buf, UWord* val ) |
| { |
| Int n = 0; |
| *val = 0; |
| while (hexdigit(*buf) >= 0) { |
| *val = (*val << 4) + hexdigit(*buf); |
| n++; buf++; |
| } |
| return n; |
| } |
| |
| static Int readdec ( const Char* buf, UInt* val ) |
| { |
| Int n = 0; |
| *val = 0; |
| while (hexdigit(*buf) >= 0) { |
| *val = (*val * 10) + decdigit(*buf); |
| n++; buf++; |
| } |
| return n; |
| } |
| |
| |
| /* Read /proc/self/maps, store the contents into a static buffer. If |
| there's a syntax error or other failure, just abort. */ |
| |
| static void read_procselfmaps ( void ) |
| { |
| Int n_chunk, fd; |
| |
| /* Read the initial memory mapping from the /proc filesystem. */ |
| fd = VG_(open) ( "/proc/self/maps", VKI_O_RDONLY, 0 ); |
| if (fd < 0) { |
| VG_(message)(Vg_UserMsg, "FATAL: can't open /proc/self/maps"); |
| VG_(exit)(1); |
| } |
| buf_n_tot = 0; |
| do { |
| n_chunk = VG_(read) ( fd, &procmap_buf[buf_n_tot], |
| M_PROCMAP_BUF - buf_n_tot ); |
| buf_n_tot += n_chunk; |
| } while ( n_chunk > 0 && buf_n_tot < M_PROCMAP_BUF ); |
| VG_(close)(fd); |
| if (buf_n_tot >= M_PROCMAP_BUF-5) { |
| VG_(message)(Vg_UserMsg, "FATAL: M_PROCMAP_BUF is too small; " |
| "increase it and recompile"); |
| VG_(exit)(1); |
| } |
| if (buf_n_tot == 0) { |
| VG_(message)(Vg_UserMsg, "FATAL: I/O error on /proc/self/maps" ); |
| VG_(exit)(1); |
| } |
| procmap_buf[buf_n_tot] = 0; |
| } |
| |
| /* Parse /proc/self/maps. For each map entry, call |
| record_mapping, passing it, in this order: |
| |
| start address in memory |
| length |
| page protections (using the VKI_PROT_* flags) |
| mapped file device and inode |
| offset in file, or zero if no file |
| filename, zero terminated, or NULL if no file |
| |
| So the sig of the called fn might be |
| |
| void (*record_mapping)( Addr start, SizeT size, UInt prot, |
| UInt dev, UInt info, |
| ULong foffset, UChar* filename ) |
| |
| Note that the supplied filename is transiently stored; record_mapping |
| should make a copy if it wants to keep it. |
| |
| Nb: it is important that this function does not alter the contents of |
| procmap_buf! |
| */ |
| void VG_(parse_procselfmaps) ( |
| void (*record_mapping)( Addr addr, SizeT len, UInt prot, |
| UInt dev, UInt ino, ULong foff, const UChar* filename ) |
| ) |
| { |
| Int i, j, i_eol; |
| Addr start, endPlusOne; |
| UChar* filename; |
| UChar rr, ww, xx, pp, ch, tmp; |
| UInt ino, prot; |
| UWord foffset, maj, min; |
| |
| read_procselfmaps(); |
| |
| tl_assert( '\0' != procmap_buf[0] && 0 != buf_n_tot); |
| |
| if (0) |
| VG_(message)(Vg_DebugMsg, "raw:\n%s", procmap_buf ); |
| |
| /* Ok, it's safely aboard. Parse the entries. */ |
| i = 0; |
| while (True) { |
| if (i >= buf_n_tot) break; |
| |
| /* Read (without fscanf :) the pattern %16x-%16x %c%c%c%c %16x %2x:%2x %d */ |
| j = readhex(&procmap_buf[i], &start); |
| if (j > 0) i += j; else goto syntaxerror; |
| j = readchar(&procmap_buf[i], &ch); |
| if (j == 1 && ch == '-') i += j; else goto syntaxerror; |
| j = readhex(&procmap_buf[i], &endPlusOne); |
| if (j > 0) i += j; else goto syntaxerror; |
| |
| j = readchar(&procmap_buf[i], &ch); |
| if (j == 1 && ch == ' ') i += j; else goto syntaxerror; |
| |
| j = readchar(&procmap_buf[i], &rr); |
| if (j == 1 && (rr == 'r' || rr == '-')) i += j; else goto syntaxerror; |
| j = readchar(&procmap_buf[i], &ww); |
| if (j == 1 && (ww == 'w' || ww == '-')) i += j; else goto syntaxerror; |
| j = readchar(&procmap_buf[i], &xx); |
| if (j == 1 && (xx == 'x' || xx == '-')) i += j; else goto syntaxerror; |
| /* This field is the shared/private flag */ |
| j = readchar(&procmap_buf[i], &pp); |
| if (j == 1 && (pp == 'p' || pp == '-' || pp == 's')) |
| i += j; else goto syntaxerror; |
| |
| j = readchar(&procmap_buf[i], &ch); |
| if (j == 1 && ch == ' ') i += j; else goto syntaxerror; |
| |
| j = readhex(&procmap_buf[i], &foffset); |
| if (j > 0) i += j; else goto syntaxerror; |
| |
| j = readchar(&procmap_buf[i], &ch); |
| if (j == 1 && ch == ' ') i += j; else goto syntaxerror; |
| |
| j = readhex(&procmap_buf[i], &maj); |
| if (j > 0) i += j; else goto syntaxerror; |
| j = readchar(&procmap_buf[i], &ch); |
| if (j == 1 && ch == ':') i += j; else goto syntaxerror; |
| j = readhex(&procmap_buf[i], &min); |
| if (j > 0) i += j; else goto syntaxerror; |
| |
| j = readchar(&procmap_buf[i], &ch); |
| if (j == 1 && ch == ' ') i += j; else goto syntaxerror; |
| |
| j = readdec(&procmap_buf[i], &ino); |
| if (j > 0) i += j; else goto syntaxerror; |
| |
| goto read_line_ok; |
| |
| syntaxerror: |
| VG_(message)(Vg_UserMsg, "FATAL: syntax error reading /proc/self/maps"); |
| { Int k; |
| VG_(printf)("last 50 chars: `"); |
| for (k = i-50; k <= i; k++) VG_(printf)("%c", procmap_buf[k]); |
| VG_(printf)("'\n"); |
| } |
| VG_(exit)(1); |
| |
| read_line_ok: |
| |
| /* Try and find the name of the file mapped to this segment, if |
| it exists. */ |
| while (procmap_buf[i] != '\n' && i < buf_n_tot-1) i++; |
| i_eol = i; |
| i--; |
| while (!VG_(isspace)(procmap_buf[i]) && i >= 0) i--; |
| i++; |
| if (i < i_eol-1 && procmap_buf[i] == '/') { |
| /* Minor hack: put a '\0' at the filename end for the call to |
| `record_mapping', then restore the old char with `tmp'. */ |
| filename = &procmap_buf[i]; |
| tmp = filename[i_eol - i]; |
| filename[i_eol - i] = '\0'; |
| } else { |
| tmp = 0; |
| filename = NULL; |
| foffset = 0; |
| } |
| |
| prot = 0; |
| if (rr == 'r') prot |= VKI_PROT_READ; |
| if (ww == 'w') prot |= VKI_PROT_WRITE; |
| if (xx == 'x') prot |= VKI_PROT_EXEC; |
| |
| //if (start < VG_(valgrind_last)) |
| (*record_mapping) ( start, endPlusOne-start, |
| prot, maj * 256 + min, ino, |
| foffset, filename ); |
| |
| if ('\0' != tmp) { |
| filename[i_eol - i] = tmp; |
| } |
| |
| i = i_eol + 1; |
| } |
| } |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end vg_procselfmaps.c ---*/ |
| /*--------------------------------------------------------------------*/ |