From 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:29:51 +0200 Subject: Adding upstream version 2.06. Signed-off-by: Daniel Baumann --- grub-core/lib/x86_64/efi/relocator.c | 79 ++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 grub-core/lib/x86_64/efi/relocator.c (limited to 'grub-core/lib/x86_64/efi/relocator.c') diff --git a/grub-core/lib/x86_64/efi/relocator.c b/grub-core/lib/x86_64/efi/relocator.c new file mode 100644 index 0000000..7d200a1 --- /dev/null +++ b/grub-core/lib/x86_64/efi/relocator.c @@ -0,0 +1,79 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2009 Free Software Foundation, Inc. + * Copyright (C) 2016 Oracle and/or its affiliates. All rights reserved. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see . + */ + +#include +#include + +#include +#include + +#include +#include + +extern grub_uint64_t grub_relocator64_rax; +extern grub_uint64_t grub_relocator64_rbx; +extern grub_uint64_t grub_relocator64_rcx; +extern grub_uint64_t grub_relocator64_rdx; +extern grub_uint64_t grub_relocator64_rip; +extern grub_uint64_t grub_relocator64_rsi; + +extern grub_uint8_t grub_relocator64_efi_start; +extern grub_uint8_t grub_relocator64_efi_end; + +#define RELOCATOR_SIZEOF(x) (&grub_relocator##x##_end - &grub_relocator##x##_start) + +grub_err_t +grub_relocator64_efi_boot (struct grub_relocator *rel, + struct grub_relocator64_efi_state state) +{ + grub_err_t err; + void *relst; + grub_relocator_chunk_t ch; + + /* + * 64-bit relocator code may live above 4 GiB quite well. + * However, I do not want ask for problems. Just in case. + */ + err = grub_relocator_alloc_chunk_align_safe (rel, &ch, 0, 0x100000000, + RELOCATOR_SIZEOF (64_efi), 16, + GRUB_RELOCATOR_PREFERENCE_NONE, 1); + if (err) + return err; + + /* Do not touch %rsp! It points to EFI created stack. */ + grub_relocator64_rax = state.rax; + grub_relocator64_rbx = state.rbx; + grub_relocator64_rcx = state.rcx; + grub_relocator64_rdx = state.rdx; + grub_relocator64_rip = state.rip; + grub_relocator64_rsi = state.rsi; + + grub_memmove (get_virtual_current_address (ch), &grub_relocator64_efi_start, + RELOCATOR_SIZEOF (64_efi)); + + err = grub_relocator_prepare_relocs (rel, get_physical_target_address (ch), + &relst, NULL); + if (err) + return err; + + ((void (*) (void)) relst) (); + + /* Not reached. */ + return GRUB_ERR_NONE; +} -- cgit v1.2.3