Suport for bi-endianess in elf file

* grub-core/kern/elf.c: check and switch endianess with grub_{be,le}_to cpu functions. * grub-core/kern/elfXX.c: Likewise. Also-by: Tomohiro B Berry <tbberry@us.ibm.com>
Skip libgcc dependency for powerpc
2015-01-23 08:03:30 -02:00 · 2015-01-23 08:01:48 -02:00 · 2015-01-23 08:00:13 -02:00
8 changed files with 526 additions and 6 deletions
--- a/configure.ac
+++ b/configure.ac
@ -119,6 +119,7 @@ if test "x$with_platform" = x; then
    x86_64-*) platform=pc ;;
    powerpc-*) platform=ieee1275 ;;
    powerpc64-*) platform=ieee1275 ;;
+    powerpc64le-*) platform=ieee1275 ;;
    sparc64-*) platform=ieee1275 ;;
    mipsel-*) platform=loongson ;;
    mips-*) platform=arc ;;
@ -141,6 +142,7 @@ case "$target_cpu"-"$platform" in
  x86_64-none) ;;
  x86_64-*) target_cpu=i386 ;;
  powerpc64-ieee1275) target_cpu=powerpc ;;
+  powerpc64le-ieee1275) target_cpu=powerpc ;;
 esac

 # Check if the platform is supported, make final adjustments.
@ -594,6 +596,12 @@ if test "x$target_cpu" = xi386 && test "x$platform" != xemu; then
  TARGET_CFLAGS="$TARGET_CFLAGS -march=i386"
 fi

+if test x$target_cpu = xpowerpc && test x$ac_cv_c_bigendian = xno; then
+  TARGET_CFLAGS="$TARGET_CFLAGS -mbig-endian"
+  TARGET_CCASFLAGS="$TARGET_CCASFLAGS -mbig-endian"
+  TARGET_LDFLAGS="$TARGET_LDFLAGS -static -mbig-endian"
+fi
+
 if test "x$target_m32" = x1; then
  # Force 32-bit mode.
  TARGET_CFLAGS="$TARGET_CFLAGS -m32"
@ -1037,7 +1045,7 @@ else
 CFLAGS="$TARGET_CFLAGS -nostdlib -Wno-error"
 fi
 CPPFLAGS="$TARGET_CPPFLAGS"
-if test x$target_cpu = xi386 || test x$target_cpu = xx86_64 || test "x$grub_cv_cc_target_clang" = xyes ; then
+if test x$target_cpu = xi386 || test x$target_cpu = xx86_64 || test x$target_cpu = xpowerpc || test "x$grub_cv_cc_target_clang" = xyes; then
 TARGET_LIBGCC=
 else
 TARGET_LIBGCC=-lgcc
@ -1055,8 +1063,10 @@ fi
 CFLAGS="$TARGET_CFLAGS -nostdlib $DEFSYM"
 fi

-# Check for libgcc symbols
-AC_CHECK_FUNCS(__bswapsi2 __bswapdi2 __ashldi3 __ashrdi3 __lshrdi3 __ucmpdi2 _restgpr_14_x)
+if ! test x$target_cpu = xpowerpc; then
+  # Check for libgcc symbols
+  AC_CHECK_FUNCS(__bswapsi2 __bswapdi2 __ashldi3 __ashrdi3 __lshrdi3 __ucmpdi2 _restgpr_14_x)
+fi

 if test "x$TARGET_APPLE_LINKER" = x1 ; then
 CFLAGS="$TARGET_CFLAGS -nostdlib -static"
@ -1621,7 +1631,7 @@ if test x"$enable_werror" != xno ; then
  HOST_CFLAGS="$HOST_CFLAGS -Werror"
 fi

-if test "x$grub_cv_cc_target_clang" = xno; then
+if test "x$grub_cv_cc_target_clang" = xno && test x$target_cpu != xpowerpc; then
   TARGET_LDFLAGS_STATIC_LIBGCC="-static-libgcc"
 else
   TARGET_LDFLAGS_STATIC_LIBGCC=
--- a/grub-core/Makefile.am
+++ b/grub-core/Makefile.am
@ -76,6 +76,7 @@ KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/i18n.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/kernel.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/list.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/misc.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/compiler-rt.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/mm.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/parser.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/partition.h
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@ -132,6 +132,7 @@ kernel = {
  common = kern/rescue_reader.c;
  common = kern/term.c;

+  noemu = kern/compiler-rt.c;
  noemu = kern/mm.c;
  noemu = kern/time.c;
  noemu = kern/generic/millisleep.c;
@ -252,6 +253,7 @@ kernel = {

  powerpc_ieee1275 = kern/powerpc/cache.S;
  powerpc_ieee1275 = kern/powerpc/dl.c;
+  powerpc_ieee1275 = kern/powerpc/compiler-rt.S;

  sparc64_ieee1275 = kern/sparc64/cache.S;
  sparc64_ieee1275 = kern/sparc64/dl.c;
--- a/grub-core/kern/compiler-rt.c
+++ b/grub-core/kern/compiler-rt.c
@ -0,0 +1,166 @@
+/* compiler-rt.c - compiler helpers. */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010-2014  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/misc.h>
+#include <grub/compiler-rt.h>
+
+#if defined (__powerpc__)
+
+union component64
+{
+  grub_uint64_t full;
+  struct
+  {
+#ifdef GRUB_CPU_WORDS_BIGENDIAN
+    grub_uint32_t high;
+    grub_uint32_t low;
+#else
+    grub_uint32_t low;
+    grub_uint32_t high;
+#endif
+  };
+};
+
+/* Based on libgcc2.c from gcc suite.  */
+grub_uint64_t
+__lshrdi3 (grub_uint64_t u, int b)
+{
+  if (b == 0)
+    return u;
+
+  const union component64 uu = {.full = u};
+  const int bm = 32 - b;
+  union component64 w;
+
+  if (bm <= 0)
+    {
+      w.high = 0;
+      w.low = (grub_uint32_t) uu.high >> -bm;
+    }
+  else
+    {
+      const grub_uint32_t carries = (grub_uint32_t) uu.high << bm;
+
+      w.high = (grub_uint32_t) uu.high >> b;
+      w.low = ((grub_uint32_t) uu.low >> b) | carries;
+    }
+
+  return w.full;
+}
+
+/* Based on libgcc2.c from gcc suite.  */
+grub_uint64_t
+__ashrdi3 (grub_uint64_t u, int b)
+{
+  if (b == 0)
+    return u;
+
+  const union component64 uu = {.full = u};
+  const int bm = 32 - b;
+  union component64 w;
+
+  if (bm <= 0)
+    {
+      /* w.high = 1..1 or 0..0 */
+      w.high = uu.high >> (32 - 1);
+      w.low = uu.high >> -bm;
+    }
+  else
+    {
+      const grub_uint32_t carries = (grub_uint32_t) uu.high << bm;
+
+      w.high = uu.high >> b;
+      w.low = ((grub_uint32_t) uu.low >> b) | carries;
+    }
+
+  return w.full;
+}
+
+/* Based on libgcc2.c from gcc suite.  */
+grub_uint64_t
+__ashldi3 (grub_uint64_t u, int b)
+{
+  if (b == 0)
+    return u;
+
+  const union component64 uu = {.full = u};
+  const int bm = 32 - b;
+  union component64 w;
+
+  if (bm <= 0)
+    {
+      w.low = 0;
+      w.high = (grub_uint32_t) uu.low << -bm;
+    }
+  else
+    {
+      const grub_uint32_t carries = (grub_uint32_t) uu.low >> bm;
+
+      w.low = (grub_uint32_t) uu.low << b;
+      w.high = ((grub_uint32_t) uu.high << b) | carries;
+    }
+
+  return w.full;
+}
+
+/* Based on libgcc2.c from gcc suite.  */
+int
+__ucmpdi2 (grub_uint64_t a, grub_uint64_t b)
+{
+  union component64 ac, bc;
+  ac.full = a;
+  bc.full = b;
+
+  if (ac.high < bc.high)
+    return 0;
+  else if (ac.high > bc.high)
+    return 2;
+
+  if (ac.low < bc.low)
+    return 0;
+  else if (ac.low > bc.low)
+    return 2;
+  return 1;
+}
+
+/* Based on libgcc2.c from gcc suite.  */
+grub_uint32_t
+__bswapsi2 (grub_uint32_t u)
+{
+  return ((((u) & 0xff000000) >> 24)
+	  | (((u) & 0x00ff0000) >>  8)
+	  | (((u) & 0x0000ff00) <<  8)
+	  | (((u) & 0x000000ff) << 24));
+}
+
+/* Based on libgcc2.c from gcc suite.  */
+grub_uint64_t
+__bswapdi2 (grub_uint64_t u)
+{
+  return ((((u) & 0xff00000000000000ull) >> 56)
+	  | (((u) & 0x00ff000000000000ull) >> 40)
+	  | (((u) & 0x0000ff0000000000ull) >> 24)
+	  | (((u) & 0x000000ff00000000ull) >>  8)
+	  | (((u) & 0x00000000ff000000ull) <<  8)
+	  | (((u) & 0x0000000000ff0000ull) << 24)
+	  | (((u) & 0x000000000000ff00ull) << 40)
+	  | (((u) & 0x00000000000000ffull) << 56));
+}
+
+#endif
--- a/grub-core/kern/elf.c
+++ b/grub-core/kern/elf.c
@ -28,6 +28,11 @@

 GRUB_MOD_LICENSE ("GPLv3+");

+void grub_elf32_check_endianess (grub_elf_t elf);
+void grub_elf64_check_endianess (grub_elf_t elf);
+grub_err_t grub_elf32_check_version (grub_elf_t elf);
+grub_err_t grub_elf64_check_version (grub_elf_t elf);
+
 /* Check if EHDR is a valid ELF header.  */
 static grub_err_t
 grub_elf_check_header (grub_elf_t elf)
@ -38,10 +43,22 @@ grub_elf_check_header (grub_elf_t elf)
      || e->e_ident[EI_MAG1] != ELFMAG1
      || e->e_ident[EI_MAG2] != ELFMAG2
      || e->e_ident[EI_MAG3] != ELFMAG3
-      || e->e_ident[EI_VERSION] != EV_CURRENT
-      || e->e_version != EV_CURRENT)
+      || e->e_ident[EI_VERSION] != EV_CURRENT)
    return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-independent ELF magic"));

+  if (grub_elf_is_elf32 (elf))
+    {
+      grub_elf32_check_endianess (elf);
+      grub_elf32_check_version (elf);
+    }
+  else if (grub_elf_is_elf64 (elf))
+    {
+      grub_elf64_check_endianess (elf);
+      grub_elf64_check_version (elf);
+    }
+  else
+    return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-dependent ELF magic"));
+
  return GRUB_ERR_NONE;
 }

@ -127,7 +144,20 @@ grub_elf_open (const char *name)
 #define grub_elf_is_elfXX grub_elf_is_elf32
 #define grub_elfXX_load_phdrs grub_elf32_load_phdrs
 #define ElfXX_Phdr Elf32_Phdr
+#define ElfXX_Ehdr Elf32_Ehdr
 #define grub_uintXX_t grub_uint32_t
+#define grub_be_to_halfXX grub_be_to_cpu16
+#define grub_be_to_wordXX grub_be_to_cpu32
+#define grub_be_to_addrXX grub_be_to_cpu32
+#define grub_be_to_offXX grub_be_to_cpu32
+#define grub_be_to_XwordXX grub_be_to_wordXX
+#define grub_le_to_halfXX grub_le_to_cpu16
+#define grub_le_to_wordXX grub_le_to_cpu32
+#define grub_le_to_addrXX grub_le_to_cpu32
+#define grub_le_to_offXX grub_le_to_cpu32
+#define grub_le_to_XwordXX grub_le_to_wordXX
+#define grub_elfXX_check_endianess grub_elf32_check_endianess
+#define grub_elfXX_check_version grub_elf32_check_version

 #include "elfXX.c"

@ -140,7 +170,20 @@ grub_elf_open (const char *name)
 #undef grub_elf_is_elfXX
 #undef grub_elfXX_load_phdrs
 #undef ElfXX_Phdr
+#undef ElfXX_Ehdr
 #undef grub_uintXX_t
+#undef grub_be_to_halfXX
+#undef grub_be_to_wordXX
+#undef grub_be_to_addrXX
+#undef grub_be_to_offXX
+#undef grub_be_to_XwordXX
+#undef grub_le_to_halfXX
+#undef grub_le_to_wordXX
+#undef grub_le_to_addrXX
+#undef grub_le_to_offXX
+#undef grub_le_to_XwordXX
+#undef grub_elfXX_check_endianess
+#undef grub_elfXX_check_version


 /* 64-bit */
@ -153,6 +196,19 @@ grub_elf_open (const char *name)
 #define grub_elf_is_elfXX grub_elf_is_elf64
 #define grub_elfXX_load_phdrs grub_elf64_load_phdrs
 #define ElfXX_Phdr Elf64_Phdr
+#define ElfXX_Ehdr Elf64_Ehdr
 #define grub_uintXX_t grub_uint64_t
+#define grub_be_to_halfXX grub_be_to_cpu16
+#define grub_be_to_wordXX grub_be_to_cpu32
+#define grub_be_to_addrXX grub_be_to_cpu64
+#define grub_be_to_offXX grub_be_to_cpu64
+#define grub_be_to_XwordXX grub_be_to_cpu64
+#define grub_le_to_halfXX grub_le_to_cpu16
+#define grub_le_to_wordXX grub_le_to_cpu32
+#define grub_le_to_addrXX grub_le_to_cpu64
+#define grub_le_to_offXX grub_le_to_cpu64
+#define grub_le_to_XwordXX grub_le_to_cpu64
+#define grub_elfXX_check_endianess grub_elf64_check_endianess
+#define grub_elfXX_check_version grub_elf64_check_version

 #include "elfXX.c"
--- a/grub-core/kern/elfXX.c
+++ b/grub-core/kern/elfXX.c
@ -154,3 +154,76 @@ grub_elfXX_load (grub_elf_t elf, const char *filename,

  return grub_errno;
 }
+
+void
+grub_elfXX_check_endianess (grub_elf_t elf)
+{
+  ElfXX_Ehdr *e = &(elf->ehdr.ehdrXX);
+  ElfXX_Phdr *phdr;
+
+  if (e->e_ident[EI_DATA] == ELFDATA2MSB)
+    {
+      e->e_type = grub_be_to_halfXX (e->e_type);
+      e->e_machine = grub_be_to_halfXX (e->e_machine);
+      e->e_version = grub_be_to_wordXX (e->e_version);
+      e->e_entry = grub_be_to_addrXX (e->e_entry);
+      e->e_phoff = grub_be_to_offXX (e->e_phoff);
+      e->e_shoff = grub_be_to_offXX (e->e_shoff);
+      e->e_flags = grub_be_to_wordXX (e->e_flags);
+      e->e_ehsize = grub_be_to_halfXX (e->e_ehsize);
+      e->e_phentsize = grub_be_to_halfXX (e->e_phentsize);
+      e->e_phnum = grub_be_to_halfXX (e->e_phnum);
+      e->e_shentsize = grub_be_to_halfXX (e->e_shentsize);
+      e->e_shnum = grub_be_to_halfXX (e->e_shnum);
+      e->e_shstrndx = grub_be_to_halfXX (e->e_shstrndx);
+
+      FOR_ELFXX_PHDRS (elf,phdr)
+        {
+          phdr->p_type = grub_be_to_wordXX (phdr->p_type);
+          phdr->p_flags = grub_be_to_wordXX (phdr->p_flags);
+          phdr->p_offset = grub_be_to_offXX (phdr->p_offset);
+          phdr->p_vaddr = grub_be_to_addrXX (phdr->p_vaddr);
+          phdr->p_paddr = grub_be_to_addrXX (phdr->p_paddr);
+          phdr->p_filesz = grub_be_to_XwordXX (phdr->p_filesz);
+          phdr->p_memsz = grub_be_to_XwordXX (phdr->p_memsz);
+          phdr->p_align = grub_be_to_XwordXX (phdr->p_align);
+        }
+    }
+  else if (e->e_ident[EI_DATA] == ELFDATA2LSB)
+    {
+      e->e_type = grub_le_to_halfXX (e->e_type);
+      e->e_machine = grub_le_to_halfXX (e->e_machine);
+      e->e_version = grub_le_to_wordXX (e->e_version);
+      e->e_entry = grub_le_to_addrXX (e->e_entry);
+      e->e_phoff = grub_le_to_offXX (e->e_phoff);
+      e->e_shoff = grub_le_to_offXX (e->e_shoff);
+      e->e_flags = grub_le_to_wordXX (e->e_flags);
+      e->e_ehsize = grub_le_to_halfXX (e->e_ehsize);
+      e->e_phentsize = grub_le_to_halfXX (e->e_phentsize);
+      e->e_phnum = grub_le_to_halfXX (e->e_phnum);
+      e->e_shentsize = grub_le_to_halfXX (e->e_shentsize);
+      e->e_shnum = grub_le_to_halfXX (e->e_shnum);
+      e->e_shstrndx = grub_le_to_halfXX (e->e_shstrndx);
+
+      FOR_ELFXX_PHDRS (elf,phdr)
+        {
+          phdr->p_type = grub_le_to_wordXX (phdr->p_type);
+          phdr->p_flags = grub_le_to_wordXX (phdr->p_flags);
+          phdr->p_offset = grub_le_to_offXX (phdr->p_offset);
+          phdr->p_vaddr = grub_le_to_addrXX (phdr->p_vaddr);
+          phdr->p_paddr = grub_le_to_addrXX (phdr->p_paddr);
+          phdr->p_filesz = grub_le_to_XwordXX (phdr->p_filesz);
+          phdr->p_memsz = grub_le_to_XwordXX (phdr->p_memsz);
+          phdr->p_align = grub_le_to_XwordXX (phdr->p_align);
+        }
+    }
+}
+
+grub_err_t
+grub_elfXX_check_version (grub_elf_t elf)
+{
+  if (elf->ehdr.ehdrXX.e_version != EV_CURRENT)
+    return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-independent ELF magic"));
+
+  return GRUB_ERR_NONE;
+}
--- a/grub-core/kern/powerpc/compiler-rt.S
+++ b/grub-core/kern/powerpc/compiler-rt.S
@ -0,0 +1,130 @@
+/*
+ * Special support for eabi and SVR4
+ *
+ *   Copyright (C) 1995-2014 Free Software Foundation, Inc.
+ *   Written By Michael Meissner
+ *   64-bit support written by David Edelsohn
+ *
+ * This file 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, or (at your option) any
+ * later version.
+ *
+ * This file 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.
+ *
+ * Under Section 7 of GPL version 3, you are granted additional
+ * permissions described in the GCC Runtime Library Exception, version
+ * 3.1, as published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License and
+ * a copy of the GCC Runtime Library Exception along with this program;
+ * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+/* Do any initializations needed for the eabi environment */
+
+#include <grub/symbol.h>
+#include <grub/dl.h>
+
+	.section ".text"
+
+#define CFI_RESTORE(reg)		.cfi_restore reg
+#define CFI_OFFSET(reg, off)		.cfi_offset reg, off
+#define CFI_DEF_CFA_REGISTER(reg)	.cfi_def_cfa_register reg
+#define CFI_STARTPROC			.cfi_startproc
+#define CFI_ENDPROC			.cfi_endproc
+
+/* Routines for restoring integer registers, called by the compiler.  */
+/* Called with r11 pointing to the stack header word of the caller of the */
+/* function, just beyond the end of the integer restore area.  */
+
+CFI_STARTPROC
+CFI_DEF_CFA_REGISTER (11)
+CFI_OFFSET (65, 4)
+CFI_OFFSET (14, -72)
+CFI_OFFSET (15, -68)
+CFI_OFFSET (16, -64)
+CFI_OFFSET (17, -60)
+CFI_OFFSET (18, -56)
+CFI_OFFSET (19, -52)
+CFI_OFFSET (20, -48)
+CFI_OFFSET (21, -44)
+CFI_OFFSET (22, -40)
+CFI_OFFSET (23, -36)
+CFI_OFFSET (24, -32)
+CFI_OFFSET (25, -28)
+CFI_OFFSET (26, -24)
+CFI_OFFSET (27, -20)
+CFI_OFFSET (28, -16)
+CFI_OFFSET (29, -12)
+CFI_OFFSET (30, -8)
+CFI_OFFSET (31, -4)
+FUNCTION(_restgpr_14_x)	lwz	14,-72(11)	/* restore gp registers */
+CFI_RESTORE (14)
+FUNCTION(_restgpr_15_x)	lwz	15,-68(11)
+CFI_RESTORE (15)
+FUNCTION(_restgpr_16_x)	lwz	16,-64(11)
+CFI_RESTORE (16)
+FUNCTION(_restgpr_17_x)	lwz	17,-60(11)
+CFI_RESTORE (17)
+FUNCTION(_restgpr_18_x)	lwz	18,-56(11)
+CFI_RESTORE (18)
+FUNCTION(_restgpr_19_x)	lwz	19,-52(11)
+CFI_RESTORE (19)
+FUNCTION(_restgpr_20_x)	lwz	20,-48(11)
+CFI_RESTORE (20)
+FUNCTION(_restgpr_21_x)	lwz	21,-44(11)
+CFI_RESTORE (21)
+FUNCTION(_restgpr_22_x)	lwz	22,-40(11)
+CFI_RESTORE (22)
+FUNCTION(_restgpr_23_x)	lwz	23,-36(11)
+CFI_RESTORE (23)
+FUNCTION(_restgpr_24_x)	lwz	24,-32(11)
+CFI_RESTORE (24)
+FUNCTION(_restgpr_25_x)	lwz	25,-28(11)
+CFI_RESTORE (25)
+FUNCTION(_restgpr_26_x)	lwz	26,-24(11)
+CFI_RESTORE (26)
+FUNCTION(_restgpr_27_x)	lwz	27,-20(11)
+CFI_RESTORE (27)
+FUNCTION(_restgpr_28_x)	lwz	28,-16(11)
+CFI_RESTORE (28)
+FUNCTION(_restgpr_29_x)	lwz	29,-12(11)
+CFI_RESTORE (29)
+FUNCTION(_restgpr_30_x)	lwz	30,-8(11)
+CFI_RESTORE (30)
+FUNCTION(_restgpr_31_x)	lwz	0,4(11)
+				lwz	31,-4(11)
+CFI_RESTORE (31)
+				mtlr	0
+CFI_RESTORE (65)
+				mr	1,11
+CFI_DEF_CFA_REGISTER (1)
+				blr
+CFI_ENDPROC
+
+CFI_STARTPROC
+FUNCTION(_savegpr_14)	stw	14,-72(11)	/* save gp registers */
+FUNCTION(_savegpr_15)	stw	15,-68(11)
+FUNCTION(_savegpr_16)	stw	16,-64(11)
+FUNCTION(_savegpr_17)	stw	17,-60(11)
+FUNCTION(_savegpr_18)	stw	18,-56(11)
+FUNCTION(_savegpr_19)	stw	19,-52(11)
+FUNCTION(_savegpr_20)	stw	20,-48(11)
+FUNCTION(_savegpr_21)	stw	21,-44(11)
+FUNCTION(_savegpr_22)	stw	22,-40(11)
+FUNCTION(_savegpr_23)	stw	23,-36(11)
+FUNCTION(_savegpr_24)	stw	24,-32(11)
+FUNCTION(_savegpr_25)	stw	25,-28(11)
+FUNCTION(_savegpr_26)	stw	26,-24(11)
+FUNCTION(_savegpr_27)	stw	27,-20(11)
+FUNCTION(_savegpr_28)	stw	28,-16(11)
+FUNCTION(_savegpr_29)	stw	29,-12(11)
+FUNCTION(_savegpr_30)	stw	30,-8(11)
+FUNCTION(_savegpr_31)	stw	31,-4(11)
+			blr
+CFI_ENDPROC
--- a/include/grub/compiler-rt.h
+++ b/include/grub/compiler-rt.h
@ -0,0 +1,82 @@
+/* compiler.h - macros for various compiler features */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2003,2005,2006,2007,2008,2009,2010,2014  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/>.
+ */
+
+#ifndef GRUB_COMPILER_RT_HEADER
+#define GRUB_COMPILER_RT_HEADER	1
+
+#if defined (__powerpc__)
+
+void EXPORT_FUNC (_restgpr_14_x) (void);
+void EXPORT_FUNC (_restgpr_15_x) (void);
+void EXPORT_FUNC (_restgpr_16_x) (void);
+void EXPORT_FUNC (_restgpr_17_x) (void);
+void EXPORT_FUNC (_restgpr_18_x) (void);
+void EXPORT_FUNC (_restgpr_19_x) (void);
+void EXPORT_FUNC (_restgpr_20_x) (void);
+void EXPORT_FUNC (_restgpr_21_x) (void);
+void EXPORT_FUNC (_restgpr_22_x) (void);
+void EXPORT_FUNC (_restgpr_23_x) (void);
+void EXPORT_FUNC (_restgpr_24_x) (void);
+void EXPORT_FUNC (_restgpr_25_x) (void);
+void EXPORT_FUNC (_restgpr_26_x) (void);
+void EXPORT_FUNC (_restgpr_27_x) (void);
+void EXPORT_FUNC (_restgpr_28_x) (void);
+void EXPORT_FUNC (_restgpr_29_x) (void);
+void EXPORT_FUNC (_restgpr_30_x) (void);
+void EXPORT_FUNC (_restgpr_31_x) (void);
+void EXPORT_FUNC (_savegpr_14) (void);
+void EXPORT_FUNC (_savegpr_15) (void);
+void EXPORT_FUNC (_savegpr_16) (void);
+void EXPORT_FUNC (_savegpr_17) (void);
+void EXPORT_FUNC (_savegpr_18) (void);
+void EXPORT_FUNC (_savegpr_19) (void);
+void EXPORT_FUNC (_savegpr_20) (void);
+void EXPORT_FUNC (_savegpr_21) (void);
+void EXPORT_FUNC (_savegpr_22) (void);
+void EXPORT_FUNC (_savegpr_23) (void);
+void EXPORT_FUNC (_savegpr_24) (void);
+void EXPORT_FUNC (_savegpr_25) (void);
+void EXPORT_FUNC (_savegpr_26) (void);
+void EXPORT_FUNC (_savegpr_27) (void);
+void EXPORT_FUNC (_savegpr_28) (void);
+void EXPORT_FUNC (_savegpr_29) (void);
+void EXPORT_FUNC (_savegpr_30) (void);
+void EXPORT_FUNC (_savegpr_31) (void);
+
+grub_uint64_t
+EXPORT_FUNC (__lshrdi3) (grub_uint64_t u, int b);
+
+grub_uint64_t
+EXPORT_FUNC (__ashrdi3) (grub_uint64_t u, int b);
+
+grub_uint64_t
+EXPORT_FUNC (__ashldi3) (grub_uint64_t u, int b);
+
+int
+EXPORT_FUNC (__ucmpdi2) (grub_uint64_t a, grub_uint64_t b);
+
+grub_uint32_t
+EXPORT_FUNC (__bswapsi2) (grub_uint32_t u);
+
+grub_uint64_t
+EXPORT_FUNC (__bswapdi2) (grub_uint64_t u);
+
+#endif
+
+#endif /* ! GRUB_COMPILER_RT_HEADER */