diff options
Diffstat (limited to 'grub-core/kern/x86_64/efi')
| -rw-r--r-- | grub-core/kern/x86_64/efi/callwrap.S | 116 | ||||
| -rw-r--r-- | grub-core/kern/x86_64/efi/startup.S | 63 |
2 files changed, 179 insertions, 0 deletions
diff --git a/grub-core/kern/x86_64/efi/callwrap.S b/grub-core/kern/x86_64/efi/callwrap.S new file mode 100644 index 0000000..aae2678 --- /dev/null +++ b/grub-core/kern/x86_64/efi/callwrap.S @@ -0,0 +1,116 @@ +/* callwrap.S - wrapper for x86_64 efi calls */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2006,2007,2009 Free Software Foundation, Inc. + * + * 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 <http://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <grub/symbol.h> +#include <grub/boot.h> + +/* + * x86_64 uses registry to pass parameters. Unfortunately, gcc and efi use + * different call conversion, so we need to do some conversion. + * + * gcc: + * %rdi, %esi, %rdx, %rcx, %r8, %r9, 8(%rsp), 16(%rsp), ... + * + * efi: + * %rcx, %rdx, %r8, %r9, 32(%rsp), 40(%rsp), 48(%rsp), ... + * + */ + + .file "callwrap.S" + .text + +FUNCTION(efi_wrap_0) + subq $48, %rsp + call *%rdi + addq $48, %rsp + ret + +FUNCTION(efi_wrap_1) + subq $48, %rsp + mov %rsi, %rcx + call *%rdi + addq $48, %rsp + ret + +FUNCTION(efi_wrap_2) + subq $48, %rsp + mov %rsi, %rcx + call *%rdi + addq $48, %rsp + ret + +FUNCTION(efi_wrap_3) + subq $48, %rsp + mov %rcx, %r8 + mov %rsi, %rcx + call *%rdi + addq $48, %rsp + ret + +FUNCTION(efi_wrap_4) + subq $48, %rsp + mov %r8, %r9 + mov %rcx, %r8 + mov %rsi, %rcx + call *%rdi + addq $48, %rsp + ret + +FUNCTION(efi_wrap_5) + subq $48, %rsp + mov %r9, 32(%rsp) + mov %r8, %r9 + mov %rcx, %r8 + mov %rsi, %rcx + call *%rdi + addq $48, %rsp + ret + +FUNCTION(efi_wrap_6) + subq $64, %rsp + mov 64+8(%rsp), %rax + mov %rax, 40(%rsp) + mov %r9, 32(%rsp) + mov %r8, %r9 + mov %rcx, %r8 + mov %rsi, %rcx + call *%rdi + addq $64, %rsp + ret + +FUNCTION(efi_wrap_10) + subq $96, %rsp + mov 96+40(%rsp), %rax + mov %rax, 72(%rsp) + mov 96+32(%rsp), %rax + mov %rax, 64(%rsp) + mov 96+24(%rsp), %rax + mov %rax, 56(%rsp) + mov 96+16(%rsp), %rax + mov %rax, 48(%rsp) + mov 96+8(%rsp), %rax + mov %rax, 40(%rsp) + mov %r9, 32(%rsp) + mov %r8, %r9 + mov %rcx, %r8 + mov %rsi, %rcx + call *%rdi + addq $96, %rsp + ret diff --git a/grub-core/kern/x86_64/efi/startup.S b/grub-core/kern/x86_64/efi/startup.S new file mode 100644 index 0000000..fb4fc7b --- /dev/null +++ b/grub-core/kern/x86_64/efi/startup.S @@ -0,0 +1,63 @@ +/* startup.S - bootstrap GRUB itself */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2006,2007,2009 Free Software Foundation, Inc. + * + * 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 <http://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <grub/symbol.h> +#include <grub/boot.h> + + .file "startup.S" + .text + .globl start, _start + .code64 + +start: +_start: + jmp codestart + + /* + * Compatibility version number + * + * These MUST be at byte offset 6 and 7 of the executable + * DO NOT MOVE !!! + */ + . = _start + 0x6 + .byte GRUB_BOOT_VERSION_MAJOR, GRUB_BOOT_VERSION_MINOR + + /* + * This is a special data area 8 bytes from the beginning. + */ + + . = _start + 0x8 + +VARIABLE(grub_prefix) + /* to be filled by grub-mkimage */ + + /* + * Leave some breathing room for the prefix. + */ + + . = _start + 0x50 + +codestart: + movq %rcx, EXT_C(grub_efi_image_handle)(%rip) + movq %rdx, EXT_C(grub_efi_system_table)(%rip) + + call EXT_C(grub_main) + ret + |