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glibc/elf/dl-debug.c
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/* Communicate dynamic linker state to the debugger at runtime. | |
Copyright (C) 1996, 1998,2000,2002,2004,2005,2006 | |
Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include <ldsodefs.h> | |
/* These are the members in the public `struct link_map' type. | |
Sanity check that the internal type and the public type match. */ | |
#define VERIFY_MEMBER(name) \ | |
(offsetof (struct link_map_public, name) == offsetof (struct link_map, name)) | |
extern const int verify_link_map_members[(VERIFY_MEMBER (l_addr) | |
&& VERIFY_MEMBER (l_name) | |
&& VERIFY_MEMBER (l_ld) | |
&& VERIFY_MEMBER (l_next) | |
&& VERIFY_MEMBER (l_prev)) | |
? 1 : -1]; | |
/* This structure communicates dl state to the debugger. The debugger | |
normally finds it via the DT_DEBUG entry in the dynamic section, but in | |
a statically-linked program there is no dynamic section for the debugger | |
to examine and it looks for this particular symbol name. */ | |
struct r_debug _r_debug; | |
/* Initialize _r_debug if it has not already been done. The argument is | |
the run-time load address of the dynamic linker, to be put in | |
_r_debug.r_ldbase. Returns the address of _r_debug. */ | |
struct r_debug * | |
internal_function | |
_dl_debug_initialize (ElfW(Addr) ldbase, Lmid_t ns) | |
{ | |
struct r_debug *r; | |
if (ns == LM_ID_BASE) | |
r = &_r_debug; | |
else | |
r = &GL(dl_ns)[ns]._ns_debug; | |
if (r->r_brk == 0 || ldbase != 0) | |
{ | |
/* Tell the debugger where to find the map of loaded objects. */ | |
r->r_version = 1 /* R_DEBUG_VERSION XXX */; | |
r->r_ldbase = ldbase ?: _r_debug.r_ldbase; | |
r->r_map = (void *) GL(dl_ns)[ns]._ns_loaded; | |
r->r_brk = (ElfW(Addr)) &_dl_debug_state; | |
} | |
return r; | |
} | |
/* This function exists solely to have a breakpoint set on it by the | |
debugger. The debugger is supposed to find this function's address by | |
examining the r_brk member of struct r_debug, but GDB 4.15 in fact looks | |
for this particular symbol name in the PT_INTERP file. */ | |
void | |
_dl_debug_state (void) | |
{ | |
} | |
rtld_hidden_def (_dl_debug_state) |