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2968 svoboda 1
/*
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 * Copyright (c) 2008 Jiri Svoboda
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 * All rights reserved.
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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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 *
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 * - 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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 * - 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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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup rtld rtld
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 * @brief
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 * @{
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 */
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/**
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 * @file
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 */
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#include <stdio.h>
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#include <string.h>
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#include <elf_dyn.h>
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#include <dynamic.h>
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#include <rtld.h>
2968 svoboda 43
 
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void dynamic_parse(elf_dyn_t *dyn_ptr, size_t bias, dyn_info_t *info)
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{
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    elf_dyn_t *dp = dyn_ptr;
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    void *d_ptr;
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    elf_word d_val;
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    elf_word soname_idx;
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    elf_word rpath_idx;
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    DPRINTF("memset\n");
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    memset(info, 0, sizeof(info));
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    soname_idx = 0;
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    rpath_idx = 0;
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    DPRINTF("pass 1\n");
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    while (dp->d_tag != DT_NULL) {
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        d_ptr = (void *)((uint8_t *)dp->d_un.d_ptr + bias);
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        d_val = dp->d_un.d_val;
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        switch (dp->d_tag) {
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        case DT_PLTRELSZ:   info->plt_rel_sz = d_val; break;
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        case DT_PLTGOT:     info->plt_got = d_ptr; break;
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        case DT_HASH:       info->hash = d_ptr; break;
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        case DT_STRTAB:     info->str_tab = d_ptr; break;
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        case DT_SYMTAB:     info->sym_tab = d_ptr; break;
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        case DT_RELA:       info->rela = d_ptr; break;
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        case DT_RELASZ:     info->rela_sz = d_val; break;
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        case DT_RELAENT:    info->rela_ent = d_val; break;
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        case DT_STRSZ:      info->str_sz = d_val; break;
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        case DT_SYMENT:     info->sym_ent = d_val; break;
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        case DT_INIT:       info->init = d_ptr; break;
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        case DT_FINI:       info->fini = d_ptr; break;
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        case DT_SONAME:     soname_idx = d_val; break;
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        case DT_RPATH:      rpath_idx = d_val; break;
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        case DT_SYMBOLIC:   info->symbolic = true; break;
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        case DT_REL:        info->rel = d_ptr; break;
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        case DT_RELSZ:      info->rel_sz = d_val; break;
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        case DT_RELENT:     info->rel_ent = d_val; break;
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        case DT_PLTREL:     info->plt_rel = d_val; break;
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        case DT_TEXTREL:    info->text_rel = true; break;
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        case DT_JMPREL:     info->jmp_rel = d_ptr; break;
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        case DT_BIND_NOW:   info->bind_now = true; break;
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        default:
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            if (dp->d_tag >= DT_LOPROC && dp->d_tag <= DT_HIPROC)
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                dyn_parse_arch(dp, bias, info);
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            break;
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        }
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        ++dp;
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    }
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    info->soname = info->str_tab + soname_idx;
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    info->rpath = info->str_tab + rpath_idx;
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    /* This will be useful for parsing dependencies later */
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    info->dynamic = dyn_ptr;
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    DPRINTF("str_tab=0x%x, soname_idx=0x%x, soname=0x%x\n",
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        (uintptr_t)info->soname, soname_idx, (uintptr_t)info->soname);
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    DPRINTF("soname='%s'\n", info->soname);
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    DPRINTF("rpath='%s'\n", info->rpath);
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    DPRINTF("hash=0x%x\n", (uintptr_t)info->hash);
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    /*
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     * Now that we have a pointer to the string table,
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     * we can parse DT_NEEDED fields (which contain offsets into it).
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     */
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    DPRINTF("pass 2\n");
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    dp = dyn_ptr;
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    while (dp->d_tag != DT_NULL) {
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        d_val = dp->d_un.d_val;
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        switch (dp->d_tag) {
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        case DT_NEEDED:
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            /* Assume just for now there's only one dependency */
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            info->needed = info->str_tab + d_val;
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            DPRINTF("needed:'%s'\n", info->needed);
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            break;
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        default: break;
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        }
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        ++dp;
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    }
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}
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/** @}
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 */