diff options
Diffstat (limited to 'sys/boot/amd64/efi/reloc.c')
| -rw-r--r-- | sys/boot/amd64/efi/reloc.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/sys/boot/amd64/efi/reloc.c b/sys/boot/amd64/efi/reloc.c new file mode 100644 index 0000000..98bcf8e --- /dev/null +++ b/sys/boot/amd64/efi/reloc.c @@ -0,0 +1,107 @@ +/*- + * Copyright (c) 2008-2010 Rui Paulo <rpaulo@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <elf.h> +#include <efi.h> +#include <bootstrap.h> + +#ifdef __i386__ +#define ElfW_Rel Elf32_Rel +#define ElfW_Dyn Elf32_Dyn +#define ELFW_R_TYPE ELF32_R_TYPE +#elif __amd64__ +#define ElfW_Rel Elf64_Rel +#define ElfW_Dyn Elf64_Dyn +#define ELFW_R_TYPE ELF64_R_TYPE +#endif + +/* + * A simple relocator for IA32/AMD64 EFI binaries. + */ +EFI_STATUS +_reloc(unsigned long ImageBase, ElfW_Dyn *dynamic, EFI_HANDLE image_handle, + EFI_SYSTEM_TABLE *system_table) +{ + unsigned long relsz, relent; + unsigned long *newaddr; + ElfW_Rel *rel; + ElfW_Dyn *dynp; + + /* + * Find the relocation address, its size and the relocation entry. + */ + relsz = 0; + relent = 0; + for (dynp = dynamic; dynp->d_tag != DT_NULL; dynp++) { + switch (dynp->d_tag) { + case DT_REL: + case DT_RELA: + rel = (ElfW_Rel *) ((unsigned long) dynp->d_un.d_ptr + + ImageBase); + break; + case DT_RELSZ: + case DT_RELASZ: + relsz = dynp->d_un.d_val; + break; + case DT_RELENT: + case DT_RELAENT: + relent = dynp->d_un.d_val; + break; + default: + break; + } + } + + /* + * Perform the actual relocation. + * XXX: We are reusing code for the amd64 version of this, but + * we must make sure the relocation types are the same. + */ + CTASSERT(R_386_NONE == R_X86_64_NONE); + CTASSERT(R_386_RELATIVE == R_X86_64_RELATIVE); + for (; relsz > 0; relsz -= relent) { + switch (ELFW_R_TYPE(rel->r_info)) { + case R_386_NONE: + /* No relocation needs be performed. */ + break; + case R_386_RELATIVE: + /* Address relative to the base address. */ + newaddr = (unsigned long *)(ImageBase + rel->r_offset); + *newaddr += ImageBase; + break; + default: + /* XXX: do we need other relocations ? */ + break; + } + rel = (ElfW_Rel *) ((caddr_t) rel + relent); + } + + return (EFI_SUCCESS); +} |
