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Add support for converting PE+ to Elf64.

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This commit is contained in:
Vladimir Serbinenko 2013-12-16 15:30:50 +01:00
parent 66a07ce2f8
commit 6f1f6a0c82
4 changed files with 189 additions and 101 deletions
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4
ChangeLog
View file

@ -1,3 +1,7 @@
2013-12-16 Vladimir Serbinenko <phcoder@gmail.com>
Add support for converting PE+ to Elf64.
2013-12-16 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/commands/minicmd.c (grub_mini_cmd_dump): Handle LLP case.

16
configure.ac
View file

@ -699,7 +699,7 @@ AC_ARG_ENABLE([efiemu],
if test x"$enable_efiemu" = xno ; then
efiemu_excuse="explicitly disabled"
fi
if test x"$grub_cv_target_cc_link_format" = x-mi386pe ; then
if test x"$grub_cv_target_cc_link_format" = x-mi386pe || test x"$grub_cv_target_cc_link_format" = x-mi386pep ; then
efiemu_excuse="not available on cygwin"
fi
if test x"$target_cpu" != xi386 ; then
@ -759,8 +759,11 @@ CFLAGS="$TARGET_CFLAGS"
if test x"$target_cpu" = xi386 || test x"$target_cpu" = xx86_64; then
AC_CACHE_CHECK([for target linking format], [grub_cv_target_cc_link_format], [
grub_cv_target_cc_link_format=unknown
for format in -melf_${target_cpu} -melf_${target_cpu}_fbsd -melf_${target_cpu}_obsd -melf_${target_cpu}_haiku -m${target_cpu}pe -arch,${target_cpu}; do
if test x${target_cpu} != xi386 && test x$format = x${target_cpu}pe; then
for format in -melf_${target_cpu} -melf_${target_cpu}_fbsd -melf_${target_cpu}_obsd -melf_${target_cpu}_haiku -mi386pe -mi386pep -arch,${target_cpu}; do
if test x${target_cpu} != xi386 && test x$format = xi386pe; then
continue
fi
if test x${target_cpu} != xx86_64 && test x$format = xi386pep; then
continue
fi
CFLAGS="$TARGET_CFLAGS"
@ -781,9 +784,12 @@ if test x"$target_cpu" = xi386 || test x"$target_cpu" = xx86_64; then
AC_MSG_ERROR([no suitable link format found])
fi
TARGET_LDFLAGS="$TARGET_LDFLAGS -Wl,$grub_cv_target_cc_link_format"
if test x"$grub_cv_target_cc_link_format" = x-mi386pe; then
if test x"$grub_cv_target_cc_link_format" = x-mi386pe ; then
TARGET_OBJ2ELF='./build-grub-pe2elf';
fi
if test x"$grub_cv_target_cc_link_format" = x-mi386pep ; then
TARGET_OBJ2ELF='./build-grub-pep2elf';
fi
fi
if test x$grub_cv_target_cc_link_format = x-arch,i386 || test x$grub_cv_target_cc_link_format = x-arch,x86_64; then
@ -801,7 +807,7 @@ if test x$grub_cv_target_cc_link_format = x-arch,i386 || test x$grub_cv_target_c
TARGET_IMG_LDFLAGS_AC='-nostdlib -static -Wl,-preload -Wl,-segalign,20'
TARGET_IMG_BASE_LDOPT="-Wl,-image_base"
TARGET_LDFLAGS_OLDMAGIC=""
elif test x$grub_cv_target_cc_link_format = x-mi386pe; then
elif test x$grub_cv_target_cc_link_format = x-mi386pe || test x$grub_cv_target_cc_link_format = x-mi386pep ; then
TARGET_APPLE_LINKER=0
TARGET_LDFLAGS_OLDMAGIC="-Wl,-N"
TARGET_IMG_LDSCRIPT='$(top_srcdir)'"/${grub_coredir}/conf/i386-cygwin-img-ld.sc"

5
grub-core/Makefile.am
View file

@ -26,8 +26,11 @@ CFLAGS_LIBRARY += $(CFLAGS_PLATFORM) -fno-builtin
CPPFLAGS_LIBRARY += $(CPPFLAGS_PLATFORM)
CCASFLAGS_LIBRARY += $(CCASFLAGS_PLATFORM)
build-grub-pep2elf: $(top_srcdir)/util/grub-pe2elf.c $(top_srcdir)/grub-core/kern/emu/misc.c $(top_srcdir)/util/misc.c
$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) -DGRUB_BUILD=1 -DGRUB_TARGET_WORDSIZE=64 -DGRUB_UTIL=1 -DGRUB_BUILD_PROGRAM_NAME=\"build-grub-pep2elf\" $^
build-grub-pe2elf: $(top_srcdir)/util/grub-pe2elf.c $(top_srcdir)/grub-core/kern/emu/misc.c $(top_srcdir)/util/misc.c
$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) -DGRUB_BUILD=1 -DGRUB_UTIL=1 -DGRUB_BUILD_PROGRAM_NAME=\"build-grub-pe2elf\" $^
$(BUILD_CC) -o $@ -I$(top_srcdir)/include $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) -DGRUB_BUILD=1 -DGRUB_TARGET_WORDSIZE=32 -DGRUB_UTIL=1 -DGRUB_BUILD_PROGRAM_NAME=\"build-grub-pe2elf\" $^
# gentrigtables
gentrigtables: gentrigtables.c

257
util/grub-pe2elf.c
View file

@ -48,29 +48,32 @@
* relocation sections
*/
#define TEXT_SECTION 1
#define RDATA_SECTION 2
#define DATA_SECTION 3
#define BSS_SECTION 4
#define MODNAME_SECTION 5
#define MODDEPS_SECTION 6
#define MODLICENSE_SECTION 7
#define SYMTAB_SECTION 8
#define STRTAB_SECTION 9
#define REL_SECTION 10
/* 10 normal section + up to 4 relocation (.text, .rdata, .data, .symtab). */
#define MAX_SECTIONS 16
#if GRUB_TARGET_WORDSIZE == 64
typedef Elf64_Rela elf_reloc_t;
typedef Elf64_Ehdr Elf_Ehdr;
typedef Elf64_Shdr Elf_Shdr;
typedef Elf64_Sym Elf_Sym;
#define ELF_R_INFO ELF64_R_INFO
#define ELF_ST_INFO ELF64_ST_INFO
#define GRUB_PE32_MACHINE GRUB_PE32_MACHINE_X86_64
#else
typedef Elf32_Rel elf_reloc_t;
typedef Elf32_Ehdr Elf_Ehdr;
typedef Elf32_Shdr Elf_Shdr;
typedef Elf32_Sym Elf_Sym;
#define ELF_R_INFO ELF32_R_INFO
#define ELF_ST_INFO ELF32_ST_INFO
#define GRUB_PE32_MACHINE GRUB_PE32_MACHINE_I386
#endif
#define STRTAB_BLOCK 256
static char *strtab;
static int strtab_max, strtab_len;
static Elf32_Ehdr ehdr;
static Elf32_Shdr shdr[MAX_SECTIONS];
static int num_sections;
static Elf_Ehdr ehdr;
static Elf_Shdr *shdr;
static int num_sections, first_reloc_section, reloc_sections_end, symtab_section, strtab_section;
static grub_uint32_t offset, image_base;
static int
@ -102,15 +105,20 @@ write_section_data (FILE* fp, const char *name, char *image,
{
int *section_map;
int i;
grub_uint32_t last_category = 0;
grub_uint32_t idx, idx_reloc;
char *pe_strtab = (image + pe_chdr->symtab_offset
+ pe_chdr->num_symbols * sizeof (struct grub_pe32_symbol));
section_map = xmalloc ((pe_chdr->num_sections + 1) * sizeof (int));
section_map = xmalloc ((2 * pe_chdr->num_sections + 5) * sizeof (int));
section_map[0] = 0;
shdr = xmalloc ((2 * pe_chdr->num_sections + 5) * sizeof (shdr[0]));
idx = 1;
idx_reloc = pe_chdr->num_sections + 1;
for (i = 0; i < pe_chdr->num_sections; i++, pe_shdr++)
{
grub_uint32_t idx;
grub_uint32_t category;
const char *shname = pe_shdr->name;
grub_size_t secsize;
@ -124,54 +132,56 @@ write_section_data (FILE* fp, const char *name, char *image,
secsize = pe_shdr->raw_data_size;
shdr[idx].sh_type = SHT_PROGBITS;
if (! strcmp (shname, ".text"))
{
idx = TEXT_SECTION;
category = 0;
shdr[idx].sh_flags = SHF_ALLOC | SHF_EXECINSTR;
}
else if (! strcmp (shname, ".rdata"))
else if (! strncmp (shname, ".rdata", 6))
{
idx = RDATA_SECTION;
category = 1;
shdr[idx].sh_flags = SHF_ALLOC;
}
else if (! strcmp (shname, ".data"))
{
idx = DATA_SECTION;
category = 2;
shdr[idx].sh_flags = SHF_ALLOC | SHF_WRITE;
}
else if (! strcmp (shname, ".bss"))
{
idx = BSS_SECTION;
category = 3;
shdr[idx].sh_type = SHT_NOBITS;
shdr[idx].sh_flags = SHF_ALLOC | SHF_WRITE;
if (secsize < pe_shdr->virtual_size)
secsize = pe_shdr->virtual_size;
}
else if (! strcmp (shname, ".modname"))
idx = MODNAME_SECTION;
else if (! strcmp (shname, ".moddeps"))
idx = MODDEPS_SECTION;
else if (strcmp (shname, ".module_license") == 0)
idx = MODLICENSE_SECTION;
else if (strcmp (shname, ".modname") == 0 || strcmp (shname, ".moddeps") == 0
|| strcmp (shname, ".module_license") == 0)
category = 4;
else
{
section_map[i + 1] = -1;
continue;
}
if (category < last_category)
grub_util_error ("out of order sections");
section_map[i + 1] = idx;
if (pe_shdr->virtual_size
&& pe_shdr->virtual_size < secsize)
secsize = pe_shdr->virtual_size;
shdr[idx].sh_type = (idx == BSS_SECTION) ? SHT_NOBITS : SHT_PROGBITS;
shdr[idx].sh_size = secsize;
shdr[idx].sh_addralign = 1 << (((pe_shdr->characteristics >>
GRUB_PE32_SCN_ALIGN_SHIFT) &
GRUB_PE32_SCN_ALIGN_MASK) - 1);
shdr[idx].sh_addr = pe_shdr->virtual_address + image_base;
if (idx != BSS_SECTION)
if (shdr[idx].sh_type != SHT_NOBITS)
{
shdr[idx].sh_offset = offset;
grub_util_write_image_at (image + pe_shdr->raw_data_offset,
@ -185,23 +195,33 @@ write_section_data (FILE* fp, const char *name, char *image,
{
char relname[5 + strlen (shname)];
if (num_sections >= MAX_SECTIONS)
grub_util_error ("too many sections");
sprintf (relname, ".rel%s", shname);
shdr[num_sections].sh_name = insert_string (relname);
shdr[num_sections].sh_link = i;
shdr[num_sections].sh_info = idx;
shdr[idx_reloc].sh_name = insert_string (relname);
shdr[idx_reloc].sh_link = i;
shdr[idx_reloc].sh_info = idx;
shdr[idx].sh_name = shdr[num_sections].sh_name + 4;
shdr[idx].sh_name = shdr[idx_reloc].sh_name + 4;
num_sections++;
idx_reloc++;
}
else
shdr[idx].sh_name = insert_string (shname);
idx++;
}
idx_reloc -= pe_chdr->num_sections + 1;
num_sections = idx + idx_reloc + 2;
first_reloc_section = idx;
reloc_sections_end = idx + idx_reloc;
memmove (shdr + idx, shdr + pe_chdr->num_sections + 1,
idx_reloc * sizeof (shdr[0]));
memset (shdr + idx + idx_reloc, 0, 3 * sizeof (shdr[0]));
memset (shdr, 0, sizeof (shdr[0]));
symtab_section = idx + idx_reloc;
strtab_section = idx + idx_reloc + 1;
return section_map;
}
@ -209,21 +229,21 @@ static void
write_reloc_section (FILE* fp, const char *name, char *image,
struct grub_pe32_coff_header *pe_chdr,
struct grub_pe32_section_table *pe_shdr,
Elf32_Sym *symtab,
Elf_Sym *symtab,
int *symtab_map)
{
int i;
for (i = REL_SECTION; i < num_sections; i++)
for (i = first_reloc_section; i < reloc_sections_end; i++)
{
struct grub_pe32_section_table *pe_sec;
struct grub_pe32_reloc *pe_rel;
Elf32_Rel *rel;
elf_reloc_t *rel;
int num_rels, j, modified;
pe_sec = pe_shdr + shdr[i].sh_link;
pe_rel = (struct grub_pe32_reloc *) (image + pe_sec->relocations_offset);
rel = (Elf32_Rel *) xmalloc (pe_sec->num_relocations * sizeof (Elf32_Rel));
rel = (elf_reloc_t *) xmalloc (pe_sec->num_relocations * sizeof (elf_reloc_t));
num_rels = 0;
modified = 0;
@ -236,42 +256,83 @@ write_reloc_section (FILE* fp, const char *name, char *image,
(symtab_map[pe_rel->symtab_index] == -1))
grub_util_error ("invalid symbol");
if (pe_rel->type == GRUB_PE32_REL_I386_DIR32)
type = R_386_32;
else if (pe_rel->type == GRUB_PE32_REL_I386_REL32)
type = R_386_PC32;
else
grub_util_error ("unknown pe relocation type %d\n", pe_rel->type);
ofs = pe_rel->offset - pe_sec->virtual_address;
addr = (grub_uint32_t *)(image + pe_sec->raw_data_offset + ofs);
if (type == R_386_PC32)
switch (pe_rel->type)
{
#if GRUB_TARGET_WORDSIZE == 64
case 1:
type = R_X86_64_64;
rel[num_rels].r_addend = *(grub_int64_t *)addr;
*(grub_int64_t *)addr = 0;
modified = 1;
break;
case 4:
type = R_X86_64_PC32;
rel[num_rels].r_addend = *(grub_int32_t *)addr;
*addr = 0;
modified = 1;
break;
case 14:
type = R_X86_64_PC64;
rel[num_rels].r_addend = *(grub_uint64_t *)addr - 8;
*(grub_uint64_t *)addr = 0;
modified = 1;
break;
#else
case GRUB_PE32_REL_I386_DIR32:
type = R_386_32;
break;
case GRUB_PE32_REL_I386_REL32:
type = R_386_PC32;
break;
#endif
default:
grub_util_error ("unknown pe relocation type %d\n", pe_rel->type);
}
if (type ==
#if GRUB_TARGET_WORDSIZE == 64
R_386_PC32
#else
R_X86_64_PC32
#endif
)
{
unsigned char code;
code = image[pe_sec->raw_data_offset + ofs - 1];
#if GRUB_TARGET_WORDSIZE == 32
if (((code != 0xe8) && (code != 0xe9)) || (*addr))
grub_util_error ("invalid relocation (%x %x)", code, *addr);
#endif
modified = 1;
if (symtab[symtab_map[pe_rel->symtab_index]].st_shndx)
{
if (symtab[symtab_map[pe_rel->symtab_index]].st_shndx
!= shdr[i].sh_info)
grub_util_error ("cross section call is not allowed");
*addr = (symtab[symtab_map[pe_rel->symtab_index]].st_value
&& symtab[symtab_map[pe_rel->symtab_index]].st_shndx
== shdr[i].sh_info)
{
modified = 1;
*addr += (symtab[symtab_map[pe_rel->symtab_index]].st_value
- ofs - 4);
continue;
}
else
{
#if GRUB_TARGET_WORDSIZE == 64
rel[num_rels].r_addend -= 4;
#else
modified = 1;
*addr = -4;
#endif
}
}
rel[num_rels].r_offset = ofs;
rel[num_rels].r_info = ELF32_R_INFO (symtab_map[pe_rel->symtab_index],
rel[num_rels].r_info = ELF_R_INFO (symtab_map[pe_rel->symtab_index],
type);
num_rels++;
}
@ -282,12 +343,16 @@ write_reloc_section (FILE* fp, const char *name, char *image,
shdr[shdr[i].sh_info].sh_offset,
fp, name);
#if GRUB_TARGET_WORDSIZE == 64
shdr[i].sh_type = SHT_RELA;
#else
shdr[i].sh_type = SHT_REL;
#endif
shdr[i].sh_offset = offset;
shdr[i].sh_link = SYMTAB_SECTION;
shdr[i].sh_link = symtab_section;
shdr[i].sh_addralign = 4;
shdr[i].sh_entsize = sizeof (Elf32_Rel);
shdr[i].sh_size = num_rels * sizeof (Elf32_Rel);
shdr[i].sh_entsize = sizeof (elf_reloc_t);
shdr[i].sh_size = num_rels * sizeof (elf_reloc_t);
grub_util_write_image_at (rel, shdr[i].sh_size, offset, fp, name);
offset += shdr[i].sh_size;
@ -303,16 +368,16 @@ write_symbol_table (FILE* fp, const char *name, char *image,
{
struct grub_pe32_symbol *pe_symtab;
char *pe_strtab;
Elf32_Sym *symtab;
Elf_Sym *symtab;
int *symtab_map, num_syms;
int i;
pe_symtab = (struct grub_pe32_symbol *) (image + pe_chdr->symtab_offset);
pe_strtab = (char *) (pe_symtab + pe_chdr->num_symbols);
symtab = (Elf32_Sym *) xmalloc ((pe_chdr->num_symbols + 1) *
sizeof (Elf32_Sym));
memset (symtab, 0, (pe_chdr->num_symbols + 1) * sizeof (Elf32_Sym));
symtab = (Elf_Sym *) xmalloc ((pe_chdr->num_symbols + 1) *
sizeof (Elf_Sym));
memset (symtab, 0, (pe_chdr->num_symbols + 1) * sizeof (Elf_Sym));
num_syms = 1;
symtab_map = (int *) xmalloc (pe_chdr->num_symbols * sizeof (int));
@ -362,6 +427,8 @@ write_symbol_table (FILE* fp, const char *name, char *image,
if ((strcmp (symname, "_grub_mod_init")) &&
(strcmp (symname, "_grub_mod_fini")) &&
(strcmp (symname, "grub_mod_init")) &&
(strcmp (symname, "grub_mod_fini")) &&
(bind == STB_LOCAL))
continue;
@ -370,7 +437,7 @@ write_symbol_table (FILE* fp, const char *name, char *image,
symtab[num_syms].st_shndx = section_map[pe_symtab->section];
symtab[num_syms].st_value = pe_symtab->value;
symtab[num_syms].st_info = ELF32_ST_INFO (bind, type);
symtab[num_syms].st_info = ELF_ST_INFO (bind, type);
symtab_map[i] = num_syms;
num_syms++;
@ -379,17 +446,17 @@ write_symbol_table (FILE* fp, const char *name, char *image,
write_reloc_section (fp, name, image, pe_chdr, pe_shdr,
symtab, symtab_map);
shdr[SYMTAB_SECTION].sh_name = insert_string (".symtab");
shdr[SYMTAB_SECTION].sh_type = SHT_SYMTAB;
shdr[SYMTAB_SECTION].sh_offset = offset;
shdr[SYMTAB_SECTION].sh_size = num_syms * sizeof (Elf32_Sym);
shdr[SYMTAB_SECTION].sh_entsize = sizeof (Elf32_Sym);
shdr[SYMTAB_SECTION].sh_link = STRTAB_SECTION;
shdr[SYMTAB_SECTION].sh_addralign = 4;
shdr[symtab_section].sh_name = insert_string (".symtab");
shdr[symtab_section].sh_type = SHT_SYMTAB;
shdr[symtab_section].sh_offset = offset;
shdr[symtab_section].sh_size = num_syms * sizeof (Elf_Sym);
shdr[symtab_section].sh_entsize = sizeof (Elf_Sym);
shdr[symtab_section].sh_link = strtab_section;
shdr[symtab_section].sh_addralign = 4;
grub_util_write_image_at (symtab, shdr[SYMTAB_SECTION].sh_size,
grub_util_write_image_at (symtab, shdr[symtab_section].sh_size,
offset, fp, name);
offset += shdr[SYMTAB_SECTION].sh_size;
offset += shdr[symtab_section].sh_size;
free (symtab);
free (symtab_map);
@ -398,11 +465,11 @@ write_symbol_table (FILE* fp, const char *name, char *image,
static void
write_string_table (FILE *fp, const char *name)
{
shdr[STRTAB_SECTION].sh_name = insert_string (".strtab");
shdr[STRTAB_SECTION].sh_type = SHT_STRTAB;
shdr[STRTAB_SECTION].sh_offset = offset;
shdr[STRTAB_SECTION].sh_size = strtab_len;
shdr[STRTAB_SECTION].sh_addralign = 1;
shdr[strtab_section].sh_name = insert_string (".strtab");
shdr[strtab_section].sh_type = SHT_STRTAB;
shdr[strtab_section].sh_offset = offset;
shdr[strtab_section].sh_size = strtab_len;
shdr[strtab_section].sh_addralign = 1;
grub_util_write_image_at (strtab, strtab_len, offset, fp,
name);
offset += strtab_len;
@ -421,20 +488,25 @@ write_section_header (FILE *fp, const char *name)
ehdr.e_version = EV_CURRENT;
ehdr.e_type = ET_REL;
#if GRUB_TARGET_WORDSIZE == 64
ehdr.e_ident[EI_CLASS] = ELFCLASS64;
ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
ehdr.e_machine = EM_X86_64;
#else
ehdr.e_ident[EI_CLASS] = ELFCLASS32;
ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
ehdr.e_machine = EM_386;
#endif
ehdr.e_ehsize = sizeof (ehdr);
ehdr.e_shentsize = sizeof (Elf32_Shdr);
ehdr.e_shstrndx = STRTAB_SECTION;
ehdr.e_shentsize = sizeof (Elf_Shdr);
ehdr.e_shstrndx = strtab_section;
ehdr.e_shoff = offset;
ehdr.e_shnum = num_sections;
grub_util_write_image_at (&shdr, sizeof (Elf32_Shdr) * num_sections,
grub_util_write_image_at (shdr, sizeof (Elf_Shdr) * num_sections,
offset, fp, name);
grub_util_write_image_at (&ehdr, sizeof (Elf32_Ehdr), 0, fp, name);
grub_util_write_image_at (&ehdr, sizeof (Elf_Ehdr), 0, fp, name);
}
static void
@ -448,9 +520,9 @@ convert_pe (FILE* fp, const char *name, char *image)
pe_chdr = (struct grub_pe32_coff_header *) (image + (grub_le_to_cpu32 (((grub_uint32_t *)image)[0xf]) + 4));
else
pe_chdr = (struct grub_pe32_coff_header *) image;
if (grub_le_to_cpu16 (pe_chdr->machine) != GRUB_PE32_MACHINE_I386)
if (grub_le_to_cpu16 (pe_chdr->machine) != GRUB_PE32_MACHINE)
grub_util_error ("invalid coff image (%x != %x)",
grub_le_to_cpu16 (pe_chdr->machine), GRUB_PE32_MACHINE_I386);
grub_le_to_cpu16 (pe_chdr->machine), GRUB_PE32_MACHINE);
strtab = xmalloc (STRTAB_BLOCK);
strtab_max = STRTAB_BLOCK;
@ -460,12 +532,15 @@ convert_pe (FILE* fp, const char *name, char *image)
offset = sizeof (ehdr);
if (pe_chdr->optional_header_size)
{
#if GRUB_TARGET_WORDSIZE == 64
struct grub_pe64_optional_header *o;
#else
struct grub_pe32_optional_header *o;
o = (struct grub_pe32_optional_header *) (pe_chdr + 1);
#endif
o = (void *) (pe_chdr + 1);
image_base = o->image_base;
}
pe_shdr = (struct grub_pe32_section_table *) ((char *) (pe_chdr + 1) + pe_chdr->optional_header_size);
num_sections = REL_SECTION;
section_map = write_section_data (fp, name, image, pe_chdr, pe_shdr);