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/* Copyright (C) 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Bartley <dtbartle@csclub.uwaterloo.ca>, 2008.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <rtld_db.h>
#include <rtld_dbP.h>
#include <sys/elf.h>
#include <proc_service.h>
/* TODO: This function needs to handle both 32-bit and 64-bit elf files. */
#pragma weak ps_pread
/* Docs: http://docs.sun.com/app/docs/doc/817-1984/chapter6-43405 */
/* This function is really just a helper, since it doesn't actually use
any internal ld.so data. */
rd_err_e rd_get_dyns (rd_agent_t *rdap, psaddr_t addr, void **dynpp,
size_t *dynpp_sz)
{
ps_err_e res;
/* Read Ehdr. */
Elf32_Ehdr ehdr;
res = ps_pread (rdap->rd_php, addr, &ehdr, sizeof (ehdr));
if (res != PS_OK)
return RD_ERR;
/* Determine number of Phdr's. */
int nphdr;
if (ehdr.e_phnum == PN_XNUM)
{
if (ehdr.e_shoff == 0)
return RD_ERR;
/* Read Shdr. */
Elf32_Shdr shdr;
res = ps_pread (rdap->rd_php, addr + ehdr.e_shoff, &shdr, sizeof (shdr));
if (res != PS_OK)
return RD_ERR;
nphdr = shdr.sh_info;
}
else
{
nphdr = ehdr.e_phnum;
}
if (nphdr == 0)
return RD_ERR;
/* Scan all the Phdr's looking for DT_DYNAMIC. */
for (int i = 0; i < nphdr; i++)
{
Elf32_Phdr phdr;
psaddr_t phdr_ptr = addr + ehdr.e_phoff + (ehdr.e_phentsize * i);
res = ps_pread (rdap->rd_php, (psaddr_t)phdr_ptr, &phdr, sizeof (phdr));
if (res != PS_OK)
return RD_ERR;
if (phdr.p_type == PT_DYNAMIC)
{
/* Allocate some memory and read in the dynamic data. */
void *dynp = malloc (phdr.p_filesz);
if (dynp == NULL)
return RD_ERR;
res = ps_pread (rdap->rd_php, phdr.p_vaddr, dynp, phdr.p_filesz);
if (res != RD_OK)
{
free (dynp);
return RD_ERR;
}
*dynpp = dynp;
if (dynpp_sz)
*dynpp_sz = phdr.p_filesz;
return RD_OK;
}
}
/* We didn't find PT_DYNAMIC. */
return RD_DBERR;
}
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