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/* vi: set sw=4 ts=4: */
/*
* Various assembly 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);
/* 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 elf_machine_dynamic (void) attribute_unused;
static __inline__ Elf32_Addr
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 elf_machine_load_address (void) attribute_unused;
static __inline__ Elf32_Addr
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. */
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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