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/* vi: set sw=4 ts=4: */
/*
* Various assmbly language/system dependent hacks that are required
* so that we can minimize the amount of platform specific code.
* Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
*/
/* Define this if the system uses RELOCA. */
#undef 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 arm_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) = arm_modulus(n, base))
#define do_div_10(result, remain) ((result) = (((result) - (remain)) / 2) * -(-1ul / 5ul))
/* Here we define the magic numbers that this dynamic loader should accept */
#define MAGIC1 EM_ARM
#undef MAGIC2
/* Used for error messages */
#define ELF_TARGET "ARM"
struct elf_resolve;
unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
/* 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, 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_ARM_JUMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
| (((type) == R_ARM_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 ("r10");
return *got;
}
/* Return the run-time load address of the shared object. */
static inline Elf32_Addr __attribute__ ((unused))
elf_machine_load_address (void)
{
extern void __dl_start asm ("_dl_start");
Elf32_Addr got_addr = (Elf32_Addr) &__dl_start;
Elf32_Addr pcrel_addr;
#if !defined __thumb__
asm ("adr %0, _dl_start" : "=r" (pcrel_addr));
#else
int tmp;
/* The above adr will not work on thumb because it
* is negative. The only safe way is to temporarily
* swap to arm.
*/
asm( ".align 2\n"
" bx pc\n"
" nop \n"
" .arm \n"
" adr %0, _dl_start\n"
" .align 2\n"
" orr %1, pc, #1\n"
" bx %1\n"
" .force_thumb\n"
: "=r" (pcrel_addr), "=&r" (tmp));
#endif
return pcrel_addr - got_addr;
}
static inline void
elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
Elf32_Word relative_count)
{
Elf32_Rel * rpnt = (void *) rel_addr;
--rpnt;
do {
Elf32_Addr *const reloc_addr = (void *) (load_off + (++rpnt)->r_offset);
*reloc_addr += load_off;
} while (--relative_count);
}
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