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/*
* Copyright (C) 2016 Andes Technology, Inc.
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/* Define this if the system uses RELOCA. */
#define ELF_USES_RELOCA
#include <elf.h>
/* Initialization sequence for the GOT. */
#define INIT_GOT(GOT_BASE,MODULE) \
{ \
GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \
GOT_BASE[1] = (unsigned long) MODULE; \
}
static __inline__ unsigned long nds32_modulus(unsigned long m, unsigned long p)
{
unsigned long i,t,inc;
i=p; t=0;
while (!(i&(1<<31))) {
i<<=1;
t++;
}
t--;
for (inc=t;inc>2;inc--) {
i=p<<inc;
if (i&(1<<31))
break;
while (m>=i) {
m-=i;
i<<=1;
if (i&(1<<31))
break;
if (i<p)
break;
}
}
while (m>=p) {
m-=p;
}
return m;
}
#define do_rem(result, n, base) ((result) = nds32_modulus(n, base))
/* Here we define the magic numbers that this dynamic loader should accept */
#define MAGIC1 EM_NDS32
#undef MAGIC2
/* Used for error messages */
#define ELF_TARGET "NDS32"
struct elf_resolve;
unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
PLT entries should not be allowed to define the value.
ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
of the main executable's symbols, as for a COPY reloc. */
#define elf_machine_type_class(type) \
((((type) == R_NDS32_JMP_SLOT || (type) == R_NDS32_TLS_TPOFF \
|| (type) == R_NDS32_TLS_DESC) * ELF_RTYPE_CLASS_PLT) \
| (((type) == R_NDS32_COPY) * ELF_RTYPE_CLASS_COPY))
/* Return the link-time address of _DYNAMIC. Conveniently, this is the
first element of the GOT. We used to use the PIC register to do this
without a constant pool reference, but GCC 4.2 will use a pseudo-register
for the PIC base, so it may not be in r10. */
static __inline__ Elf32_Addr __attribute__ ((unused))
elf_machine_dynamic (void)
{
Elf32_Addr link_addr;
__asm__ ( "l.w %0, _GLOBAL_OFFSET_TABLE_@GOTOFF": "=r" (link_addr) );
return link_addr;
}
/* Return the run-time load address of the shared object. */
static __inline__ Elf32_Addr __attribute__ ((unused))
elf_machine_load_address (void)
{
/* It doesn't matter what variable this is, the reference never makes
it to assembly. We need a dummy reference to some global variable
via the GOT to make sure the compiler initialized %ebx in time. */
Elf32_Addr addr;
__asm__ ("la %0, _DYNAMIC@GOTOFF\n" : "=r" (addr) );
return addr - elf_machine_dynamic();
}
static __inline__ void
elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
Elf32_Word relative_count)
{
Elf32_Rela * rpnt = (void *) rel_addr;
--rpnt;
do {
Elf32_Addr *const reloc_addr = (void *) (load_off + (++rpnt)->r_offset);
*reloc_addr = load_off + rpnt->r_addend;
} while (--relative_count);
}
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