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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) /* 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" /* Need bootstrap relocations */ #define ARCH_NEEDS_BOOTSTRAP_RELOCS unsigned long _dl_linux_resolver(unsigned long got_offset, unsigned long *got); #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 __always_inline Elf32_Addr elf_machine_dynamic (void) { register Elf32_Addr *got __asm__("r6"); return *got; } extern char __dl_start[] __asm__("_dl_start"); /* Return the run-time load address of the shared object. */ static __always_inline Elf32_Addr elf_machine_load_address (void) { 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 __always_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); } |