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/*
* Various assembly language/system dependent hacks that are required
* so that we can minimize the amount of platform specific code.
*
* Copyright (C) 2004-2007 Atmel Corporation
*
* 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>
#define ARCH_NUM 1
#define DT_AVR32_GOTSZ_IDX (DT_NUM + OS_NUM)
#define ARCH_DYNAMIC_INFO(dpnt, dynamic, debug_addr) \
do { \
if (dpnt->d_tag == DT_AVR32_GOTSZ) \
dynamic[DT_AVR32_GOTSZ_IDX] = dpnt->d_un.d_val; \
} while (0)
/* Initialization sequence for the application/library GOT. */
#define INIT_GOT(GOT_BASE,MODULE) \
do { \
unsigned long i, nr_got; \
\
GOT_BASE[0] = (unsigned long) _dl_linux_resolve; \
GOT_BASE[1] = (unsigned long) MODULE; \
\
/* Add load address displacement to all GOT entries */ \
nr_got = MODULE->dynamic_info[DT_AVR32_GOTSZ_IDX] / 4; \
for (i = 2; i < nr_got; i++) \
GOT_BASE[i] += (unsigned long)MODULE->loadaddr; \
} while (0)
#define do_rem(result, n, base) ((result) = (n) % (base))
/* Here we define the magic numbers that this dynamic loader should accept */
#define MAGIC1 EM_AVR32
#undef MAGIC2
/* Used for error messages */
#define ELF_TARGET "AVR32"
unsigned long _dl_linux_resolver(unsigned long got_offset, unsigned long *got);
/* 4096 bytes alignment */
#define PAGE_ALIGN 0xfffff000
#define ADDR_ALIGN 0xfff
#define OFFS_ALIGN 0x7ffff000
#define elf_machine_type_class(type) \
((type == R_AVR32_JMP_SLOT) * ELF_RTYPE_CLASS_PLT)
/* AVR32 doesn't need any COPY relocs */
#define DL_NO_COPY_RELOCS
/* 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
elf_machine_dynamic (void)
{
register Elf32_Addr *got asm ("r6");
return *got;
}
/* Return the run-time load address of the shared object. */
static inline Elf32_Addr
elf_machine_load_address (void)
{
extern void __dl_start asm("_dl_start");
Elf32_Addr got_addr = (Elf32_Addr) &__dl_start;
Elf32_Addr pcrel_addr;
asm (" lddpc %0, 2f\n"
"1: add %0, pc\n"
" rjmp 3f\n"
" .align 2\n"
"2: .long _dl_start - 1b\n"
"3:\n"
: "=r"(pcrel_addr) : : "cc");
return pcrel_addr - got_addr;
}
/*
* Perform any RELATIVE relocations specified by DT_RELCOUNT.
* Currently, we don't use that tag, but we might in the future as
* this would reduce the startup time somewhat (although probably not by much).
*/
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;
do {
Elf32_Addr *reloc_addr;
reloc_addr = (void *)(load_off + (rpnt++)->r_offset);
*reloc_addr = load_off + rpnt->r_addend;
} while (--relative_count);
}
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