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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) 2005 by Erik Andersen <andersen@codepoet.org> */ /* 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) \ do { \ GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \ GOT_BASE[1] = (unsigned long) (MODULE); \ } while(0) /* Here we define the magic numbers that this dynamic loader should accept */ #define MAGIC1 EM_68K #undef MAGIC2 /* Used for error messages */ #define ELF_TARGET "m68k" /* Need bootstrap relocations */ #define ARCH_NEEDS_BOOTSTRAP_RELOCS struct elf_resolve; extern unsigned long _dl_linux_resolver (struct elf_resolve *, int); /* 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_68K_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \ | (((type) == R_68K_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 __always_inline Elf32_Addr elf_machine_dynamic (void) { Elf32_Addr got; __asm__ ("move.l _DYNAMIC@GOT.w(%%a5), %0" : "=a" (got)); return got; } #ifdef __mcoldfire__ #define PCREL_OP(OP, SRC, DST, TMP, PC) \ "move.l #" SRC " - ., " TMP "\n\t" OP " (-8, " PC ", " TMP "), " DST #else #define PCREL_OP(OP, SRC, DST, TMP, PC) \ OP " " SRC "(" PC "), " DST #endif /* Return the run-time load address of the shared object. */ static __always_inline Elf32_Addr elf_machine_load_address (void) { Elf32_Addr addr; __asm__ (PCREL_OP ("lea", "_dl_start", "%0", "%0", "%%pc") "\n\t" "sub.l _dl_start@GOT.w(%%a5), %0" : "=a" (addr)); return addr; } 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; --rpnt; do { Elf32_Addr *const reloc_addr = (void *) (load_off + (++rpnt)->r_offset); *reloc_addr = load_off + rpnt->r_addend; } while (--relative_count); } |