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/* dynamic.c: part containing a .dynamic section.
*
* Copyright (C) 1999,2001,2021 by Brian Raiter, under the GNU General
* Public License, version 2. No warranty. See COPYING for details.
*/
#include <stdlib.h>
#include <elf.h>
#include "elfparts.h"
#include "elfpartsi.h"
/* Set the value of an entry in a dynamic section. The entry is added
* to the section if it is not already present. The return value is
* the index of the entry.
*/
static int setdynvalue(elfpart *part, int tag, intptr_t value)
{
Elf64_Dyn *dyn;
int n;
dyn = part->part;
for (n = 0 ; n < part->count - 1 ; ++n) {
if (dyn[n].d_tag == tag) {
dyn[n].d_un.d_val = value;
return n;
}
}
return -1;
}
/* Set up the elfpart structure for a dynamic section.
*/
static bool new(elfpart *part)
{
part->shtype = SHT_DYNAMIC;
part->shname = ".dynamic";
part->flags = PF_R | PF_W;
part->entsize = sizeof(Elf64_Dyn);
return true;
}
/* Initialize the dynamic section with the minimally required entries.
*/
static bool init(elfpart *part, blueprint const *bp)
{
Elf64_Dyn *dyn;
int i;
part->count = 6;
dyn = _resizepart(part, part->count * part->entsize);
if (!dyn)
return false;
dyn[0].d_tag = DT_HASH;
dyn[1].d_tag = DT_SYMTAB;
dyn[2].d_tag = DT_SYMENT;
dyn[3].d_tag = DT_STRTAB;
dyn[4].d_tag = DT_STRSZ;
dyn[5].d_tag = DT_NULL;
for (i = 0 ; i < 6 ; ++i)
dyn[i].d_un.d_val = 0;
part->done = true;
return true;
(void)bp;
}
/* Fill in the values for the required entries.
*/
static bool complete(elfpart *part, blueprint const *bp)
{
elfpart *other;
other = NULL;
foreachpart (p0 in bp) {
if (p0->shtype == SHT_HASH) {
other = p0;
break;
}
}
if (other) {
setdynvalue(part, DT_HASH, other->addr);
other = other->link;
if (other) {
setdynvalue(part, DT_SYMTAB, other->addr);
setdynvalue(part, DT_SYMENT, other->entsize);
other = other->link;
if (other) {
setdynvalue(part, DT_STRTAB, other->addr);
setdynvalue(part, DT_STRSZ, other->size);
}
}
}
part->done = true;
return true;
}
/* The dynamic elfpart structure.
*/
elfpart part_dynamic = { new, init, NULL, complete };
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