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