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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) \
- 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_386
- #undef MAGIC2
- /* Used for error messages */
- #define ELF_TARGET "386"
- struct elf_resolve;
- extern unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
- #define do_rem(result, n, base) ((result) = (n) % (base))
- /* 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 or
- TLS variable, so undefined references 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_386_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
- | (((type) == R_386_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 ("%ebx");
- return *got;
- }
- /* Return the run-time load address of the shared object. */
- static inline Elf32_Addr __attribute__ ((unused))
- elf_machine_load_address (void)
- {
- /* It doesn't matter what variable this is, the reference never makes
- it to assembly. We need a dummy reference to some global variable
- via the GOT to make sure the compiler initialized %ebx in time. */
- extern int _dl_errno;
- Elf32_Addr addr;
- asm ("leal _dl_start@GOTOFF(%%ebx), %0\n"
- "subl _dl_start@GOT(%%ebx), %0"
- : "=r" (addr) : "m" (_dl_errno) : "cc");
- return 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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