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x86: Add support for 64-bit relocation 

Add a 64-bit relocation function. SPL loads U-Boot into RAM at a fixed
address and runs it. U-Boot then relocates itself to the top of RAM using
this relocation function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2017-01-16 07:03:54 -07:00 committed by Bin Meng
parent dc7e21339e
commit b50b1633c0
1 changed files with 45 additions and 0 deletions
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45
arch/x86/lib/relocate.c
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@ -47,6 +47,46 @@ int clear_bss(void)
return 0;
}
#if CONFIG_IS_ENABLED(X86_64)
static void do_elf_reloc_fixups64(unsigned int text_base, uintptr_t size,
Elf64_Rela *re_src, Elf64_Rela *re_end)
{
Elf64_Addr *offset_ptr_rom, *last_offset = NULL;
Elf64_Addr *offset_ptr_ram;
do {
/* Get the location from the relocation entry */
offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset;
/* Check that the location of the relocation is in .text */
if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base &&
offset_ptr_rom > last_offset) {
/* Switch to the in-RAM version */
offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom +
gd->reloc_off);
/* Check that the target points into .text */
if (*offset_ptr_ram >= text_base &&
*offset_ptr_ram <= text_base + size) {
*offset_ptr_ram = gd->reloc_off +
re_src->r_addend;
} else {
debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %"
PRIXPTR "\n",
re_src, (ulong)re_src->r_info,
(ulong)re_src->r_offset, offset_ptr_ram,
(ulong)*offset_ptr_ram, text_base + size);
}
} else {
debug(" %p: %lx: rom reloc %lx, last %p\n", re_src,
(ulong)re_src->r_info, (ulong)re_src->r_offset,
last_offset);
}
last_offset = offset_ptr_rom;
} while (++re_src < re_end);
}
#else
static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size,
Elf32_Rel *re_src, Elf32_Rel *re_end)
{
@ -84,6 +124,7 @@ static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size,
} while (++re_src < re_end);
}
#endif
/*
* This function has more error checking than you might expect. Please see
@ -109,7 +150,11 @@ int do_elf_reloc_fixups(void)
#else
panic("No CONFIG_SYS_TEXT_BASE");
#endif
#if CONFIG_IS_ENABLED(X86_64)
do_elf_reloc_fixups64(text_base, size, re_src, re_end);
#else
do_elf_reloc_fixups32(text_base, size, re_src, re_end);
#endif
return 0;
}