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/* Communicate dynamic linker state to the debugger at runtime.
Copyright (C) 1996-2024 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
<https://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];
/* Update the `r_map' member and return the address of `struct r_debug'
of the namespace NS. */
struct r_debug *
_dl_debug_update (Lmid_t ns)
{
struct r_debug_extended *r;
if (ns == LM_ID_BASE)
r = &_r_debug_extended;
else
r = &GL(dl_ns)[ns]._ns_debug;
if (r->base.r_map == NULL)
atomic_store_release (&r->base.r_map,
(void *) GL(dl_ns)[ns]._ns_loaded);
return &r->base;
}
/* Initialize _r_debug_extended for the namespace NS. LDBASE is the
run-time load address of the dynamic linker, to be put in
_r_debug_extended.r_ldbase. Return the address of _r_debug. */
struct r_debug *
_dl_debug_initialize (ElfW(Addr) ldbase, Lmid_t ns)
{
struct r_debug_extended *r, **pp = NULL;
if (ns == LM_ID_BASE)
{
r = &_r_debug_extended;
/* Initialize r_version to 1. */
if (_r_debug_extended.base.r_version == 0)
_r_debug_extended.base.r_version = 1;
}
else if (DL_NNS > 1)
{
r = &GL(dl_ns)[ns]._ns_debug;
if (r->base.r_brk == 0)
{
/* Add the new namespace to the linked list. After a namespace
is initialized, r_brk becomes non-zero. A namespace becomes
empty (r_map == NULL) when it is unused. But it is never
removed from the linked list. */
struct r_debug_extended *p;
for (pp = &_r_debug_extended.r_next;
(p = *pp) != NULL;
pp = &p->r_next)
;
r->base.r_version = 2;
}
}
if (r->base.r_brk == 0)
{
/* Tell the debugger where to find the map of loaded objects.
This function is called from dlopen. Initialize the namespace
only once. */
r->base.r_ldbase = ldbase ?: _r_debug_extended.base.r_ldbase;
r->base.r_brk = (ElfW(Addr)) &_dl_debug_state;
r->r_next = NULL;
}
if (r->base.r_map == NULL)
atomic_store_release (&r->base.r_map,
(void *) GL(dl_ns)[ns]._ns_loaded);
if (pp != NULL)
{
atomic_store_release (pp, r);
/* Bump r_version to 2 for the new namespace. */
atomic_store_release (&_r_debug_extended.base.r_version, 2);
}
return &r->base;
}
/* 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)
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