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 ---
Changes in v3: None Changes in v2: None
arch/x86/lib/relocate.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+)
diff --git a/arch/x86/lib/relocate.c b/arch/x86/lib/relocate.c index 861e6675b3b..d207fddb756 100644 --- a/arch/x86/lib/relocate.c +++ b/arch/x86/lib/relocate.c @@ -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; }