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elf: Add <dl-r_debug.h>

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Add <dl-r_debug.h> to get the adddress of the r_debug structure after
relocation and its offset before relocation from the PT_DYNAMIC segment
to support DT_DEBUG, DT_MIPS_RLD_MAP_REL and DT_MIPS_RLD_MAP.

Co-developed-by: Xi Ruoyao <xry111@mengyan1223.wang>
This commit is contained in:
H.J. Lu
2022-01-29 10:56:45 -08:00
parent 829ea0caca
commit 3fb18fd80c
4 changed files with 123 additions and 24 deletions
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64
sysdeps/mips/dl-r_debug.h Normal file
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@@ -0,0 +1,64 @@
/* Function to access r_debug structure. MIPS specific 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/>. */
#ifdef EW_
/* Return the offset of the struct r_debug before relocation. */
static inline EW(Addr)
E(r_debug_offset) (EW(Dyn) *d, int fd, EW(Addr) offset)
{
switch (d->d_tag)
{
case DT_MIPS_RLD_MAP_REL:
offset += d->d_un.d_val;
break;
case DT_MIPS_RLD_MAP:
offset = d->d_un.d_ptr;
break;
default:
return 0;
}
if (pread (fd, &offset, sizeof (offset), offset) != sizeof (offset))
return 0;
return offset;
}
#else
/* Return the address of the struct r_debug after relocation. */
static inline EW(Addr)
E(r_debug_address) (EW(Dyn) *d)
{
EW(Addr) ptr;
switch (d->d_tag)
{
case DT_MIPS_RLD_MAP_REL:
ptr = ((EW(Addr)) d) + d->d_un.d_val;
break;
case DT_MIPS_RLD_MAP:
ptr = d->d_un.d_ptr;
break;
default:
return 0;
}
return *(EW(Addr) *) ptr;
}
#endif