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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
*/
#ifndef _INLINE_RELOC_H
#define _INLINE_RELOC_H
#include <sys/types.h>
#include <rtld.h>
#include <debug.h>
/*
* Generic relative relocation function.
*/
inline static ulong_t
/* LINTED */
/* ARGSUSED4 */
_elf_reloc_relative(ulong_t rbgn, ulong_t base, Rt_map *lmp, APlist **textrel,
int add)
{
mmapobj_result_t *mpp;
ulong_t roffset;
roffset = ((M_RELOC *)rbgn)->r_offset;
roffset += base;
/*
* If this relocation is against an address that is not associated with
* a mapped segment, fall back to the generic relocation loop to
* collect the associated error.
*/
if ((mpp = find_segment((caddr_t)roffset, lmp)) == NULL)
return (0);
/*
* If this relocation is against a segment that does not provide write
* access, set the write permission for all non-writable mappings.
*/
if (((mpp->mr_prot & PROT_WRITE) == 0) && textrel &&
((set_prot(lmp, mpp, 1) == 0) ||
(aplist_append(textrel, mpp, AL_CNT_TEXTREL) == NULL)))
return (0);
/*
* Perform a base address update. This simple operation is required
* for updating .plt relocations in preparation for lazy binding.
*/
#if defined(__x86)
if (add) {
*((ulong_t *)roffset) += base;
return (1);
}
#endif
/*
* Perform the actual relocation. Note, for backward compatibility,
* SPARC relocations are added to the offset contents (there was a time
* when the offset was used to contain the addend, rather than using
* the addend itself).
*/
#if defined(__sparc)
*((ulong_t *)roffset) += base + ((M_RELOC *)rbgn)->r_addend;
#elif defined(__amd64)
*((ulong_t *)roffset) = base + ((M_RELOC *)rbgn)->r_addend;
#else
*((ulong_t *)roffset) += base;
#endif
return (1);
}
/*
* When a generic relocation loop realizes that it's dealing with relative
* relocations, but no DT_RELCOUNT .dynamic tag is present, this tighter loop
* is entered as an optimization.
*/
inline static ulong_t
/* LINTED */
elf_reloc_relative(ulong_t rbgn, ulong_t rend, ulong_t rsize, ulong_t base,
Rt_map *lmp, APlist **textrel, int add)
{
uchar_t rtype;
do {
if (_elf_reloc_relative(rbgn, base, lmp, textrel, add) == 0)
break;
rbgn += rsize;
if (rbgn >= rend)
break;
/*
* Make sure the next type is a relative relocation.
*/
rtype = ELF_R_TYPE(((M_RELOC *)rbgn)->r_info, M_MACH);
} while (rtype == M_R_RELATIVE);
return (rbgn);
}
/*
* This is the tightest loop for RELATIVE relocations for those objects built
* with the DT_RELACOUNT .dynamic entry.
*/
inline static ulong_t
/* LINTED */
elf_reloc_relative_count(ulong_t rbgn, ulong_t rcount, ulong_t rsize,
ulong_t base, Rt_map *lmp, APlist **textrel, int add)
{
for (; rcount; rcount--) {
if (_elf_reloc_relative(rbgn, base, lmp, textrel, add) == 0)
break;
rbgn += rsize;
}
return (rbgn);
}
/*
* Determine, from a symbols Syminfo information, whether a symbol reference
* is deferred. This routine is called from elf_reloc() as part of processing
* an objects relocations.
*/
inline static int
/* LINTED */
is_sym_deferred(ulong_t rbgn, ulong_t base, Rt_map *lmp, APlist **textrel,
Syminfo *sip, ulong_t sndx)
{
Syminfo *sipe;
/*
* ldd(1) by default, sets LD_DEFERRED to force deferred dependency
* processing. ldd -D disables LD_DEFERRED, which allows ld.so.1's
* default action of skipping deferred dependencies.
*/
if (rtld_flags & RT_FL_DEFERRED)
return (0);
/* LINTED */
sipe = (Syminfo *)((char *)sip + (sndx * SYMINENT(lmp)));
if (sipe->si_flags & SYMINFO_FLG_DEFERRED) {
/*
* This .plt relocation should be skipped at this time, as
* deferred references are only processed when the associated
* function is explicitly called.
*
* On i386 and amd64 platforms the relocation offset needs
* adjusting to add this objects base address. If the object
* has already been relocated without RTLD_NOW, then this
* update will have already been carried out. However, if this
* is an initial RTLD_NOW relocation pass, this relocation
* offset needs updating now.
*/
#if defined(__x86)
if ((FLAGS(lmp) & FLG_RT_RELOCED) == 0)
(void) _elf_reloc_relative(rbgn, base, lmp, textrel, 1);
#endif
return (1);
}
return (0);
}
#endif /* _INLINE_RELOC_H */
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