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Revamp relocation handling.

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Move more code to common dl.c. Add missing veneers for arm and arm64.
	Decreases kernel size by 70 bytes on i386-pc (40-50 compressed)
This commit is contained in:
Vladimir Serbinenko 2013-12-06 09:18:55 +01:00
parent a846dd4b3a
commit 8c534b85f1
18 changed files with 1097 additions and 987 deletions
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42
grub-core/kern/dl.c
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@ -229,7 +229,7 @@ grub_dl_load_segments (grub_dl_t mod, const Elf_Ehdr *e)
unsigned i;
Elf_Shdr *s;
grub_size_t tsize = 0, talign = 1;
#if defined (__ia64__) || defined (__powerpc__) || defined (__mips__)
#if !defined (__i386__) && !defined (__x86_64__) && !defined (__sparc__)
grub_size_t tramp;
grub_size_t got;
grub_err_t err;
@ -245,7 +245,7 @@ grub_dl_load_segments (grub_dl_t mod, const Elf_Ehdr *e)
talign = s->sh_addralign;
}
#if defined (__ia64__) || defined (__powerpc__) || defined (__mips__)
#if !defined (__i386__) && !defined (__x86_64__) && !defined (__sparc__)
err = grub_arch_dl_get_tramp_got_size (e, &tramp, &got);
if (err)
return err;
@ -314,12 +314,14 @@ grub_dl_load_segments (grub_dl_t mod, const Elf_Ehdr *e)
mod->segment = seg;
}
}
#if defined (__ia64__) || defined (__powerpc__) || defined (__mips__)
#if !defined (__i386__) && !defined (__x86_64__) && !defined (__sparc__)
ptr = (char *) ALIGN_UP ((grub_addr_t) ptr, GRUB_ARCH_DL_TRAMP_ALIGN);
mod->tramp = ptr;
mod->trampptr = ptr;
ptr += tramp;
ptr = (char *) ALIGN_UP ((grub_addr_t) ptr, GRUB_ARCH_DL_GOT_ALIGN);
mod->got = ptr;
mod->gotptr = ptr;
ptr += got;
#endif
@ -352,6 +354,7 @@ grub_dl_resolve_symbols (grub_dl_t mod, Elf_Ehdr *e)
#else
mod->symtab = (Elf_Sym *) ((char *) e + s->sh_offset);
#endif
mod->symsize = s->sh_entsize;
sym = mod->symtab;
size = s->sh_size;
entsize = s->sh_entsize;
@ -561,6 +564,37 @@ grub_dl_flush_cache (grub_dl_t mod)
grub_arch_sync_caches (mod->base, mod->sz);
}
static grub_err_t
grub_dl_relocate_symbols (grub_dl_t mod, void *ehdr)
{
Elf_Ehdr *e = ehdr;
Elf_Shdr *s;
unsigned i;
for (i = 0, s = (Elf_Shdr *) ((char *) e + e->e_shoff);
i < e->e_shnum;
i++, s = (Elf_Shdr *) ((char *) s + e->e_shentsize))
if (s->sh_type == SHT_REL || s->sh_type == SHT_RELA)
{
grub_dl_segment_t seg;
grub_err_t err;
/* Find the target segment. */
for (seg = mod->segment; seg; seg = seg->next)
if (seg->section == s->sh_info)
break;
if (seg)
{
err = grub_arch_dl_relocate_symbols (mod, ehdr, s, seg);
if (err)
return err;
}
}
return GRUB_ERR_NONE;
}
/* Load a module from core memory. */
grub_dl_t
grub_dl_load_core_noinit (void *addr, grub_size_t size)
@ -607,7 +641,7 @@ grub_dl_load_core_noinit (void *addr, grub_size_t size)
|| grub_dl_resolve_dependencies (mod, e)
|| grub_dl_load_segments (mod, e)
|| grub_dl_resolve_symbols (mod, e)
|| grub_arch_dl_relocate_symbols (mod, e))
|| grub_dl_relocate_symbols (mod, e))
{
mod->fini = 0;
grub_dl_unload (mod);