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/*
* Various assmbly language/system dependent hacks that are required
* so that we can minimize the amount of platform specific code.
*/
/* Define this if the system uses RELOCA. */
#define ELF_USES_RELOCA
#include <elf.h>
/*
* Initialization sequence for a GOT.
*/
#define INIT_GOT(GOT_BASE,MODULE) \
{ \
GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \
GOT_BASE[1] = (unsigned long) (MODULE); \
}
/* Here we define the magic numbers that this dynamic loader should accept */
#define MAGIC1 EM_SH
#undef MAGIC2
/* Used for error messages */
#define ELF_TARGET "sh"
struct elf_resolve;
extern unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
static __inline__ unsigned int
_dl_urem(unsigned int n, unsigned int base)
{
int res;
__asm__ (""\
"mov #0, r0\n\t" \
"div0u\n\t" \
"" \
"! get one bit from the msb of the numerator into the T\n\t" \
"! bit and divide it by whats in %2. Put the answer bit\n\t" \
"! into the T bit so it can come out again at the bottom\n\t" \
"" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1 ; div1 %2, r0\n\t" \
"rotcl %1\n\t"
: "=r" (res)
: "0" (n), "r" (base)
: "r0","cc");
return n - (base * res);
}
#define do_rem(result, n, base) ((result) = _dl_urem((n), (base)))
/* 4096 bytes alignment */
#define PAGE_ALIGN 0xfffff000
#define ADDR_ALIGN 0xfff
#define OFFS_ALIGN 0x7ffff000
/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
TLS variable, so undefined references 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_SH_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
| (((type) == R_SH_COPY) * ELF_RTYPE_CLASS_COPY))
/* Return the link-time address of _DYNAMIC. Conveniently, this is the
first element of the GOT. This must be inlined in a function which
uses global data. */
static __inline__ Elf32_Addr __attribute__ ((unused))
elf_machine_dynamic (void)
{
register Elf32_Addr *got;
__asm__ ("mov r12,%0" :"=r" (got));
return *got;
}
/* Return the run-time load address of the shared object. */
static __inline__ Elf32_Addr __attribute__ ((unused))
elf_machine_load_address (void)
{
Elf32_Addr addr;
__asm__ ("mov.l 1f,r0\n\
mov.l 3f,r2\n\
add r12,r2\n\
mov.l @(r0,r12),r0\n\
bra 2f\n\
sub r0,r2\n\
.align 2\n\
1: .long _dl_start@GOT\n\
3: .long _dl_start@GOTOFF\n\
2: mov r2,%0"
: "=r" (addr) : : "r0", "r1", "r2");
return addr;
}
#define COPY_UNALIGNED_WORD(swp, twp, align) \
{ \
void *__s = (swp), *__t = (twp); \
unsigned char *__s1 = __s, *__t1 = __t; \
unsigned short *__s2 = __s, *__t2 = __t; \
unsigned long *__s4 = __s, *__t4 = __t; \
switch ((align)) \
{ \
case 0: \
*__t4 = *__s4; \
break; \
case 2: \
*__t2++ = *__s2++; \
*__t2 = *__s2; \
break; \
default: \
*__t1++ = *__s1++; \
*__t1++ = *__s1++; \
*__t1++ = *__s1++; \
*__t1 = *__s1; \
break; \
} \
}
static __inline__ void
elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
Elf32_Word relative_count)
{
Elf32_Addr value;
Elf32_Rela * rpnt = (void *)rel_addr;
do {
Elf32_Addr *const reloc_addr = (void *) (load_off + rpnt->r_offset);
if (rpnt->r_addend)
value = load_off + rpnt->r_addend;
else {
COPY_UNALIGNED_WORD (reloc_addr, &value, (int) reloc_addr & 3);
value += load_off;
}
COPY_UNALIGNED_WORD (&value, reloc_addr, (int) reloc_addr & 3);
rpnt++;
} while (--relative_count);
#undef COPY_UNALIGNED_WORD
}
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