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elf: Add <dl-debug.h>

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Add <dl-debug.h> to setup debugging entry in PT_DYNAMIC segment to support
DT_DEBUG, DT_MIPS_RLD_MAP_REL and DT_MIPS_RLD_MAP.

Tested on x86-64, x32 and i686 as well as with build-many-glibcs.py.
This commit is contained in:
H.J. Lu
2021-12-09 18:24:37 -08:00
parent bd1616c6be
commit 9288c92d00
5 changed files with 80 additions and 33 deletions
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41
sysdeps/mips/dl-debug.h Normal file
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@@ -0,0 +1,41 @@
/* Debugging support. MIPS version.
Copyright (C) 2022 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/>. */
#ifndef _DL_DEBUG_H
#define _DL_DEBUG_H
/* If there is a DT_MIPS_RLD_MAP_REL or DT_MIPS_RLD_MAP entry in the
dynamic section, fill in the debug map pointer with the run-time
address of the r_debug structure. */
static inline void
__attribute ((always_inline))
elf_setup_debug_entry (struct link_map *l, struct r_debug *r)
{
if (l->l_info[DT_MIPS (RLD_MAP_REL)] != NULL)
{
char *ptr = (char *) l->l_info[DT_MIPS (RLD_MAP_REL)];
ptr += l->l_info[DT_MIPS (RLD_MAP_REL)]->d_un.d_val;
*(ElfW(Addr) *) ptr = (ElfW(Addr)) r;
}
else if (l->l_info[DT_MIPS (RLD_MAP)] != NULL)
*(ElfW(Addr) *) (l->l_info[DT_MIPS (RLD_MAP)]->d_un.d_ptr)
= (ElfW(Addr)) r;
}
#endif /* _DL_DEBUG_H */