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/* $OpenBSD: boot.c,v 1.19 2022/01/08 06:49:41 guenther Exp $ */
/*
* Copyright (c) 1998 Per Fogelstrom, Opsycon AB
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* IMPORTANT: any functions below are NOT protected by SSP. Please
* do not add anything except what is required to reach GOT with
* an adjustment.
*/
#define _DYN_LOADER
#include <sys/exec_elf.h>
#include "util.h"
#include "archdep.h" /* for RELOC_TAG */
#include "../../lib/csu/os-note-elf.h"
#if RELOC_TAG == DT_RELA
typedef Elf_RelA RELOC_TYPE;
# define RELOCATE_RELATIVE(w, r, b) *(w) = (r)->r_addend + (b)
#elif RELOC_TAG == DT_REL
typedef Elf_Rel RELOC_TYPE;
# define RELOCATE_RELATIVE(w, r, b) *(w) += (b)
#else
# error "unknown RELOC_TAG"
#endif
/*
* Local decls.
*/
void _dl_boot_bind(const long, long *, Elf_Dyn *) __boot;
void
_dl_boot_bind(const long sp, long *dl_data, Elf_Dyn *dynp)
{
AuxInfo *auxstack;
long *stack;
int n, argc;
char **argv, **envp;
long loff;
RELOC_TYPE *dt_reloc; /* DT_RELA or DT_REL */
Elf_Word dt_relocsz; /* DT_RELASZ or DT_RELSZ */
RELOC_TYPE *rend;
/*
* Scan argument and environment vectors. Find dynamic
* data vector put after them.
*/
stack = (long *)sp;
argc = *stack++;
argv = (char **)stack;
envp = &argv[argc + 1];
stack = (long *)envp;
while (*stack++ != 0L)
;
/*
* Zero out dl_data.
*/
for (n = 0; n <= AUX_entry; n++)
dl_data[n] = 0;
/*
* Dig out auxiliary data set up by exec call. Move all known
* tags to an indexed local table for easy access.
*/
for (auxstack = (AuxInfo *)stack; auxstack->au_id != AUX_null;
auxstack++) {
if (auxstack->au_id > AUX_entry)
continue;
dl_data[auxstack->au_id] = auxstack->au_v;
}
loff = dl_data[AUX_base]; /* XXX assumes ld.so is linked at 0x0 */
/*
* Scan the DYNAMIC section for the loader for the two items we need
*/
dt_reloc = NULL;
dt_relocsz = 0;
while (dynp->d_tag != DT_NULL) {
if (dynp->d_tag == RELOC_TAG) /* DT_{RELA,REL} */
dt_reloc = (void *)(dynp->d_un.d_ptr + loff);
else if (dynp->d_tag == RELOC_TAG+1) /* DT_{RELA,REL}SZ */
dt_relocsz = dynp->d_un.d_val;
dynp++;
}
rend = (RELOC_TYPE *)((char *)dt_reloc + dt_relocsz);
for (; dt_reloc < rend; dt_reloc++) {
Elf_Addr *ra;
ra = (Elf_Addr *)(dt_reloc->r_offset + loff);
RELOCATE_RELATIVE(ra, dt_reloc, loff);
}
}
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