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-rw-r--r--grub-core/kern/x86_64/dl.c119
-rw-r--r--grub-core/kern/x86_64/efi/callwrap.S116
-rw-r--r--grub-core/kern/x86_64/efi/startup.S63
3 files changed, 298 insertions, 0 deletions
diff --git a/grub-core/kern/x86_64/dl.c b/grub-core/kern/x86_64/dl.c
new file mode 100644
index 0000000..090ad78
--- /dev/null
+++ b/grub-core/kern/x86_64/dl.c
@@ -0,0 +1,119 @@
+/* dl-x86_64.c - arch-dependent part of loadable module support */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2002,2005,2007,2009 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 <grub/dl.h>
+#include <grub/elf.h>
+#include <grub/misc.h>
+#include <grub/err.h>
+
+/* Check if EHDR is a valid ELF header. */
+grub_err_t
+grub_arch_dl_check_header (void *ehdr)
+{
+ Elf64_Ehdr *e = ehdr;
+
+ /* Check the magic numbers. */
+ if (e->e_ident[EI_CLASS] != ELFCLASS64
+ || e->e_ident[EI_DATA] != ELFDATA2LSB
+ || e->e_machine != EM_X86_64)
+ return grub_error (GRUB_ERR_BAD_OS, "invalid arch specific ELF magic");
+
+ return GRUB_ERR_NONE;
+}
+
+/* Relocate symbols. */
+grub_err_t
+grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr)
+{
+ Elf64_Ehdr *e = ehdr;
+ Elf64_Shdr *s;
+ Elf64_Word entsize;
+ unsigned i;
+
+ /* Find a symbol table. */
+ for (i = 0, s = (Elf64_Shdr *) ((char *) e + e->e_shoff);
+ i < e->e_shnum;
+ i++, s = (Elf64_Shdr *) ((char *) s + e->e_shentsize))
+ if (s->sh_type == SHT_SYMTAB)
+ break;
+
+ if (i == e->e_shnum)
+ return grub_error (GRUB_ERR_BAD_MODULE, "no symtab found");
+
+ entsize = s->sh_entsize;
+
+ for (i = 0, s = (Elf64_Shdr *) ((char *) e + e->e_shoff);
+ i < e->e_shnum;
+ i++, s = (Elf64_Shdr *) ((char *) s + e->e_shentsize))
+ if (s->sh_type == SHT_RELA)
+ {
+ grub_dl_segment_t seg;
+
+ /* Find the target segment. */
+ for (seg = mod->segment; seg; seg = seg->next)
+ if (seg->section == s->sh_info)
+ break;
+
+ if (seg)
+ {
+ Elf64_Rela *rel, *max;
+
+ for (rel = (Elf64_Rela *) ((char *) e + s->sh_offset),
+ max = rel + s->sh_size / s->sh_entsize;
+ rel < max;
+ rel++)
+ {
+ Elf64_Word *addr32;
+ Elf64_Xword *addr64;
+ Elf64_Sym *sym;
+
+ if (seg->size < rel->r_offset)
+ return grub_error (GRUB_ERR_BAD_MODULE,
+ "reloc offset is out of the segment");
+
+ addr32 = (Elf64_Word *) ((char *) seg->addr + rel->r_offset);
+ addr64 = (Elf64_Xword *) addr32;
+ sym = (Elf64_Sym *) ((char *) mod->symtab
+ + entsize * ELF_R_SYM (rel->r_info));
+
+ switch (ELF_R_TYPE (rel->r_info))
+ {
+ case R_X86_64_64:
+ *addr64 += rel->r_addend + sym->st_value;
+ break;
+
+ case R_X86_64_PC32:
+ *addr32 += rel->r_addend + sym->st_value -
+ (Elf64_Xword) seg->addr - rel->r_offset;
+ break;
+
+ case R_X86_64_32:
+ case R_X86_64_32S:
+ *addr32 += rel->r_addend + sym->st_value;
+ break;
+
+ default:
+ grub_fatal ("Unrecognized relocation: %d\n", ELF_R_TYPE (rel->r_info));
+ }
+ }
+ }
+ }
+
+ return GRUB_ERR_NONE;
+}
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
+
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