mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 11:43:34 +08:00
77 lines
2.7 KiB
C
77 lines
2.7 KiB
C
/* Communicate dynamic linker state to the debugger at runtime.
|
|
Copyright (C) 1996-2013 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#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_map == NULL || 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)
|