1 /* vi: set sw=4 ts=4: */
3 * Various assembly language/system dependent hacks that are required
4 * so that we can minimize the amount of platform specific code.
5 * Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
8 /* Define this if the system uses RELOCA. */
9 #define ELF_USES_RELOCA
11 /* Initialization sequence for a GOT. */
12 #define INIT_GOT(GOT_BASE,MODULE) \
14 GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \
15 GOT_BASE[1] = (unsigned long) (MODULE); \
18 /* Here we define the magic numbers that this dynamic loader should accept */
22 /* Used for error messages */
23 #define ELF_TARGET "m68k"
25 /* Need bootstrap relocations */
26 #define ARCH_NEEDS_BOOTSTRAP_RELOCS
29 extern unsigned long _dl_linux_resolver (struct elf_resolve *, int);
31 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
32 PLT entries should not be allowed to define the value.
33 ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
34 of the main executable's symbols, as for a COPY reloc. */
35 #define elf_machine_type_class(type) \
36 ((((type) == R_68K_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
37 | (((type) == R_68K_COPY) * ELF_RTYPE_CLASS_COPY))
39 /* Return the link-time address of _DYNAMIC. Conveniently, this is the
40 first element of the GOT. This must be inlined in a function which
42 static __always_inline Elf32_Addr
43 elf_machine_dynamic (void)
47 __asm__ ("move.l _DYNAMIC@GOT.w(%%a5), %0"
53 #define PCREL_OP(OP, SRC, DST, TMP, PC) \
54 "move.l #" SRC " - ., " TMP "\n\t" OP " (-8, " PC ", " TMP "), " DST
56 #define PCREL_OP(OP, SRC, DST, TMP, PC) \
57 OP " " SRC "(" PC "), " DST
60 /* Return the run-time load address of the shared object. */
61 static __always_inline Elf32_Addr
62 elf_machine_load_address (void)
65 __asm__ (PCREL_OP ("lea", "_dl_start", "%0", "%0", "%%pc") "\n\t"
66 "sub.l _dl_start@GOT.w(%%a5), %0"
71 static __always_inline void
72 elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
73 Elf32_Word relative_count)
75 Elf32_Rela * rpnt = (void *)rel_addr;
78 Elf32_Addr *const reloc_addr = (void *) (load_off + (++rpnt)->r_offset);
80 *reloc_addr = load_off + rpnt->r_addend;
81 } while (--relative_count);