mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 06:20:06 +00:00
119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
/* Communicate dynamic linker state to the debugger at runtime.
|
|
Copyright (C) 1996-2023 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)
|