diff options
Diffstat (limited to 'grub-core/lib/x86_64')
| -rw-r--r-- | grub-core/lib/x86_64/efi/relocator.c | 79 | ||||
| -rw-r--r-- | grub-core/lib/x86_64/relocator_asm.S | 85 | ||||
| -rw-r--r-- | grub-core/lib/x86_64/setjmp.S | 68 | ||||
| -rw-r--r-- | grub-core/lib/x86_64/xen/relocator.S | 133 |
4 files changed, 365 insertions, 0 deletions
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 <http://www.gnu.org/licenses/>. + */ + +#include <grub/mm.h> +#include <grub/misc.h> + +#include <grub/types.h> +#include <grub/err.h> + +#include <grub/i386/relocator.h> +#include <grub/relocator_private.h> + +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; +} diff --git a/grub-core/lib/x86_64/relocator_asm.S b/grub-core/lib/x86_64/relocator_asm.S new file mode 100644 index 0000000..2ab6d8c --- /dev/null +++ b/grub-core/lib/x86_64/relocator_asm.S @@ -0,0 +1,85 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 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 <grub/symbol.h> +#include <grub/i386/memory.h> + + .p2align 2 + +VARIABLE(grub_relocator_backward_start) + /* mov imm32, %rax */ + .byte 0x48 + .byte 0xb8 +VARIABLE(grub_relocator_backward_dest) + .long 0, 0 + movq %rax, %rdi + + /* mov imm64, %rax */ + .byte 0x48 + .byte 0xb8 +VARIABLE(grub_relocator_backward_src) + .long 0, 0 + movq %rax, %rsi + + /* mov imm64, %rcx */ + .byte 0x48 + .byte 0xb9 +VARIABLE(grub_relocator_backward_chunk_size) + .long 0, 0 + + add %rcx, %rsi + add %rcx, %rdi + + /* Backward movsb is implicitly off-by-one. compensate that. */ + sub $1, %rsi + sub $1, %rdi + + /* Backward copy. */ + std + + rep + movsb +VARIABLE(grub_relocator_backward_end) + + +VARIABLE(grub_relocator_forward_start) + /* mov imm64, %rax */ + .byte 0x48 + .byte 0xb8 +VARIABLE(grub_relocator_forward_dest) + .long 0, 0 + movq %rax, %rdi + + /* mov imm64, %rax */ + .byte 0x48 + .byte 0xb8 +VARIABLE(grub_relocator_forward_src) + .long 0, 0 + movq %rax, %rsi + + /* mov imm64, %rcx */ + .byte 0x48 + .byte 0xb9 +VARIABLE(grub_relocator_forward_chunk_size) + .long 0, 0 + + /* Forward copy. */ + cld + rep + movsb +VARIABLE(grub_relocator_forward_end) diff --git a/grub-core/lib/x86_64/setjmp.S b/grub-core/lib/x86_64/setjmp.S new file mode 100644 index 0000000..6b151bc --- /dev/null +++ b/grub-core/lib/x86_64/setjmp.S @@ -0,0 +1,68 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2003,2007 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 <grub/symbol.h> +#include <grub/dl.h> + + .file "setjmp.S" + +GRUB_MOD_LICENSE "GPLv3+" + + .text + +/* + * jmp_buf: + * rbx rsp rbp r12 r13 r14 r15 rip + * 0 8 16 24 32 40 48 56 + */ + +/* + * int grub_setjmp (grub_jmp_buf env) + */ +FUNCTION(grub_setjmp) + pop %rsi /* Return address, and adjust the stack */ + xorq %rax, %rax + movq %rbx, 0(%rdi) /* RBX */ + movq %rsp, 8(%rdi) /* RSP */ + push %rsi + movq %rbp, 16(%rdi) /* RBP */ + movq %r12, 24(%rdi) /* R12 */ + movq %r13, 32(%rdi) /* R13 */ + movq %r14, 40(%rdi) /* R14 */ + movq %r15, 48(%rdi) /* R15 */ + movq %rsi, 56(%rdi) /* RSI */ + ret + +/* + * int grub_longjmp (grub_jmp_buf env, int val) + */ +FUNCTION(grub_longjmp) + movl %esi, %eax + orl %eax, %eax + jnz 1f + incl %eax +1: + + movq (%rdi), %rbx + movq 8(%rdi), %rsp + movq 16(%rdi), %rbp + movq 24(%rdi), %r12 + movq 32(%rdi), %r13 + movq 40(%rdi), %r14 + movq 48(%rdi), %r15 + jmp *56(%rdi) diff --git a/grub-core/lib/x86_64/xen/relocator.S b/grub-core/lib/x86_64/xen/relocator.S new file mode 100644 index 0000000..f5364ed --- /dev/null +++ b/grub-core/lib/x86_64/xen/relocator.S @@ -0,0 +1,133 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2013 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 <grub/x86_64/memory.h> +#include <grub/x86_64/types.h> +#include <grub/symbol.h> +#include <grub/xen.h> + +/* Macro to load an imm64 value stored by the C-part into %rax: */ +#define MOV_IMM64_RAX(var) .byte 0x48, 0xb8; VARIABLE(var); .quad 0 + + .p2align 4 /* force 16-byte alignment */ + +VARIABLE(grub_relocator_xen_remap_start) +LOCAL(base): + /* Remap the remapper to it's new address. */ + MOV_IMM64_RAX(grub_relocator_xen_remapper_virt) + + movq %rax, %rdi /* %rdi: new virtual address of remapper */ + movq %rax, %rbx /* Remember new virtual address */ + + MOV_IMM64_RAX(grub_relocator_xen_remapper_map) + + movq %rax, %rsi /* %rsi: page table entry */ + + movq $UVMF_INVLPG, %rdx /* %rdx: flags (inv. single entry) */ + movq $__HYPERVISOR_update_va_mapping, %rax + syscall /* Do the remap operation */ + + addq $(LOCAL(cont) - LOCAL(base)), %rbx + + jmp *%rbx /* Continue with new virtual address */ + +LOCAL(cont): + /* Modify mappings of new page tables to be read-only. */ + MOV_IMM64_RAX(grub_relocator_xen_mfn_list) + + movq %rax, %rbx /* %rbx is the base of the p2m list */ + leaq EXT_C(grub_relocator_xen_paging_areas) (%rip), %r8 + +1: + movq 0(%r8), %r12 /* Get start pfn of the current area */ + movq GRUB_TARGET_SIZEOF_LONG(%r8), %rcx /* Get # of pg tables */ + testq %rcx, %rcx /* 0 -> last area reached */ + jz 3f +2: + movq %r12, %rdi + shlq $PAGE_SHIFT, %rdi /* virtual address (1:1 mapping) */ + movq (%rbx, %r12, 8), %rsi /* mfn */ + shlq $PAGE_SHIFT, %rsi + orq $(GRUB_PAGE_PRESENT | GRUB_PAGE_USER), %rsi /* Build pte */ + movq $UVMF_INVLPG, %rdx + movq %rcx, %r9 /* %rcx clobbered by hypercall */ + movq $__HYPERVISOR_update_va_mapping, %rax + syscall + + movq %r9, %rcx + incq %r12 /* next pfn */ + + loop 2b + + addq $(2 * GRUB_TARGET_SIZEOF_LONG), %r8 /* next pg table area */ + jmp 1b + +3: + /* Switch page tables: pin new L4 pt, load cr3, unpin old L4. */ + leaq EXT_C(grub_relocator_xen_mmu_op) (%rip), %rdi + movq $3, %rsi /* 3 mmu ops */ + movq $0, %rdx /* pdone (not used) */ + movq $DOMID_SELF, %r10 + movq $__HYPERVISOR_mmuext_op, %rax + syscall + + /* Continue in virtual kernel mapping. */ + MOV_IMM64_RAX(grub_relocator_xen_remap_continue) + + jmp *%rax + +VARIABLE(grub_relocator_xen_paging_areas) + /* array of start, size pairs, size 0 is end marker */ + .quad 0, 0, 0, 0, 0, 0, 0, 0 + +VARIABLE(grub_relocator_xen_mmu_op) + .space 256 + +VARIABLE(grub_relocator_xen_remap_end) + + +VARIABLE(grub_relocator_xen_start) + /* Unmap old remapper area. */ + MOV_IMM64_RAX(grub_relocator_xen_remapper_virt2) + + movq %rax, %rdi + + xorq %rax, %rax /* Invalid pte */ + movq %rax, %rsi + + movq $UVMF_INVLPG, %rdx + movq $__HYPERVISOR_update_va_mapping, %rax + syscall + + /* Prepare registers for starting kernel. */ + MOV_IMM64_RAX(grub_relocator_xen_stack) + + movq %rax, %rsp + + MOV_IMM64_RAX(grub_relocator_xen_start_info) + + movq %rax, %rsi + + cld + + MOV_IMM64_RAX(grub_relocator_xen_entry_point) + + /* Now start the new kernel. */ + jmp *%rax + +VARIABLE(grub_relocator_xen_end) |