FreeBSD-5.3/sys/ia64/ia64/elf_machdep.c
/*-
* Copyright 1996-1998 John D. Polstra.
* All rights reserved.
*
* 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.
*
* $FreeBSD: src/sys/ia64/ia64/elf_machdep.c,v 1.19 2004/08/11 02:35:05 marcel Exp $
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/imgact.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/fcntl.h>
#include <sys/vnode.h>
#include <sys/linker.h>
#include <sys/sysent.h>
#include <sys/imgact_elf.h>
#include <sys/syscall.h>
#include <sys/signalvar.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <machine/elf.h>
#include <machine/frame.h>
#include <machine/md_var.h>
#include <machine/unwind.h>
Elf_Addr link_elf_get_gp(linker_file_t);
extern Elf_Addr fptr_storage[];
struct sysentvec elf64_freebsd_sysvec = {
SYS_MAXSYSCALL,
sysent,
0,
0,
NULL,
0,
NULL,
NULL,
__elfN(freebsd_fixup),
sendsig,
NULL, /* sigcode */
NULL, /* &szsigcode */
NULL,
"FreeBSD ELF64",
__elfN(coredump),
NULL,
MINSIGSTKSZ,
PAGE_SIZE,
VM_MIN_ADDRESS,
VM_MAXUSER_ADDRESS,
USRSTACK,
PS_STRINGS,
VM_PROT_ALL,
exec_copyout_strings,
exec_setregs,
NULL
};
static Elf64_Brandinfo freebsd_brand_info = {
ELFOSABI_FREEBSD,
EM_IA_64,
"FreeBSD",
NULL,
"/libexec/ld-elf.so.1",
&elf64_freebsd_sysvec,
NULL,
};
SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
(sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info);
static Elf64_Brandinfo freebsd_brand_oinfo = {
ELFOSABI_FREEBSD,
EM_IA_64,
"FreeBSD",
NULL,
"/usr/libexec/ld-elf.so.1",
&elf64_freebsd_sysvec,
NULL,
};
SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
(sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_oinfo);
void
elf64_dump_thread(struct thread *td, void *dst, size_t *off __unused)
{
/* Flush the dirty registers onto the backingstore. */
if (dst == NULL)
ia64_flush_dirty(td, &td->td_frame->tf_special);
}
static Elf_Addr
lookup_fdesc(linker_file_t lf, Elf_Word symidx, elf_lookup_fn lookup)
{
linker_file_t top;
Elf_Addr addr;
const char *symname;
int i;
static int eot = 0;
addr = lookup(lf, symidx, 0);
if (addr == 0) {
top = lf;
symname = elf_get_symname(top, symidx);
for (i = 0; i < top->ndeps; i++) {
lf = top->deps[i];
addr = (Elf_Addr)linker_file_lookup_symbol(lf,
symname, 0);
if (addr != 0)
break;
}
if (addr == 0)
return (0);
}
if (eot)
return (0);
/*
* Lookup and/or construct OPD
*/
for (i = 0; i < 8192; i += 2) {
if (fptr_storage[i] == addr)
return (Elf_Addr)(fptr_storage + i);
if (fptr_storage[i] == 0) {
fptr_storage[i] = addr;
fptr_storage[i+1] = link_elf_get_gp(lf);
return (Elf_Addr)(fptr_storage + i);
}
}
printf("%s: fptr table full\n", __func__);
eot = 1;
return (0);
}
/* Process one elf relocation with addend. */
static int
elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
int type, int local, elf_lookup_fn lookup)
{
Elf_Addr *where;
Elf_Addr addend, addr;
Elf_Word rtype, symidx;
const Elf_Rel *rel;
const Elf_Rela *rela;
switch (type) {
case ELF_RELOC_REL:
rel = (const Elf_Rel *)data;
where = (Elf_Addr *)(relocbase + rel->r_offset);
rtype = ELF_R_TYPE(rel->r_info);
symidx = ELF_R_SYM(rel->r_info);
switch (rtype) {
case R_IA64_DIR64LSB:
case R_IA64_FPTR64LSB:
case R_IA64_REL64LSB:
addend = *where;
break;
default:
addend = 0;
break;
}
break;
case ELF_RELOC_RELA:
rela = (const Elf_Rela *)data;
where = (Elf_Addr *)(relocbase + rela->r_offset);
rtype = ELF_R_TYPE(rela->r_info);
symidx = ELF_R_SYM(rela->r_info);
addend = rela->r_addend;
break;
default:
panic("%s: invalid ELF relocation (0x%x)\n", __func__, type);
}
if (local) {
if (rtype == R_IA64_REL64LSB)
*where = relocbase + addend;
return (0);
}
switch (rtype) {
case R_IA64_NONE:
break;
case R_IA64_DIR64LSB: /* word64 LSB S + A */
addr = lookup(lf, symidx, 1);
if (addr == 0)
return (-1);
*where = addr + addend;
break;
case R_IA64_FPTR64LSB: /* word64 LSB @fptr(S + A) */
if (addend != 0) {
printf("%s: addend ignored for OPD relocation\n",
__func__);
}
addr = lookup_fdesc(lf, symidx, lookup);
if (addr == 0)
return (-1);
*where = addr;
break;
case R_IA64_REL64LSB: /* word64 LSB BD + A */
break;
case R_IA64_IPLTLSB:
addr = lookup_fdesc(lf, symidx, lookup);
if (addr == 0)
return (-1);
where[0] = *((Elf_Addr*)addr) + addend;
where[1] = *((Elf_Addr*)addr + 1);
break;
default:
printf("%s: unknown relocation (0x%x)\n", __func__,
(int)rtype);
return -1;
}
return (0);
}
int
elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
elf_lookup_fn lookup)
{
return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
}
int
elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
int type, elf_lookup_fn lookup)
{
return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
}
int
elf_cpu_load_file(linker_file_t lf)
{
Elf_Ehdr *hdr;
Elf_Phdr *ph, *phlim;
Elf_Addr reloc, vaddr;
hdr = (Elf_Ehdr *)(lf->address);
if (!IS_ELF(*hdr)) {
printf("Missing or corrupted ELF header at %p\n", hdr);
return (EFTYPE);
}
/*
* Iterate over the segments and register the unwind table if
* we come across it.
*/
ph = (Elf_Phdr *)(lf->address + hdr->e_phoff);
phlim = ph + hdr->e_phnum;
reloc = ~0ULL;
while (ph < phlim) {
if (ph->p_type == PT_LOAD && reloc == ~0ULL)
reloc = (Elf_Addr)lf->address - ph->p_vaddr;
if (ph->p_type == PT_IA_64_UNWIND) {
vaddr = ph->p_vaddr + reloc;
unw_table_add((vm_offset_t)lf->address, vaddr,
vaddr + ph->p_memsz);
}
++ph;
}
return (0);
}
int
elf_cpu_unload_file(linker_file_t lf)
{
unw_table_remove((vm_offset_t)lf->address);
return (0);
}