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Do the same for ia32...

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Once again, on ia32 this time, we see:

00000120  47 84 00 00 0a 00 00 00  00 00 00 00 00 00 00 00 |G...............|

Which is where the pointer on ia32 for the Base Relocation Table should
be.  It points to 0x8447, which isn't a particularly reasonable address as
numbers go, and happens to have this data there:

00008440  6f 00 6e 00 66 00 69 00  67 00 75 00 72 00 65 00 |o.n.f.i.g.u.r.e.|
00008450  00 00 49 00 50 00 76 00  36 00 28 00 00 00 2c 00 |..I.P.v.6.(...,.|
00008460  25 00 73 00 2c 00 00 00  29 00 00 00 25 00 64 00 |%.s.,...)...%.d.|
00008470  2e 00 25 00 64 00 2e 00  25 00 64 00 2e 00 25 00 |..%.d...%.d...%.|
00008480  64 00 00 00 44 00 48 00  43 00 50 00 00 00 49 00 |d...D.H.C.P...I.|
00008490  50 00 76 00 34 00 28 00  00 00 2c 00 25 00 73 00 |P.v.4.(...,.%.s.|

And so that table is, in theory, this part:

00008447                       00  67 00 75 00 72 00 65 00 |       .g.u.r.e.|
00008450  00                                               |.               |

Which is pretty clearly not a pointer table of any kind.

So give ia32 the same treatment as x86_64, and now all arches work basically
the same.

Signed-off-by: Peter Jones <pjones@redhat.com>
This commit is contained in:
Peter Jones 2014-09-21 16:25:27 -04:00
parent 2c59a1a03a
commit f9d825b242
3 changed files with 236 additions and 49 deletions
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22
Makefile
View File

@ -6,19 +6,25 @@ ARCH = $(shell $(CC) -dumpmachine | cut -f1 -d- | sed s,i[3456789]86,ia32,)
SUBDIRS = Cryptlib lib
LIB_PATH = /usr/lib64
EFI_INCLUDE := /usr/include/efi
EFI_INCLUDES = -nostdinc -ICryptlib -ICryptlib/Include -I$(EFI_INCLUDE) -I$(EFI_INCLUDE)/$(ARCH) -I$(EFI_INCLUDE)/protocol -Iinclude
EFI_PATH := /usr/lib64/gnuefi
ifeq ($(ARCH),ia32)
LIB_PATH := /usr/lib
EFI_PATH := /usr/lib/gnuefi
endif
LIB_PATH ?= /usr/lib64
EFI_PATH ?= /usr/lib64/gnuefi
LIB_GCC = $(shell $(CC) -print-libgcc-file-name)
EFI_LIBS = -lefi -lgnuefi --start-group Cryptlib/libcryptlib.a Cryptlib/OpenSSL/libopenssl.a --end-group $(LIB_GCC)
ifeq ($(ARCH),x86_64)
EFI_CRT_OBJS := crt0-efi-$(ARCH).o
endif
else ifeq ($(ARCH),ia32)
EFI_CRT_OBJS := crt0-efi-$(ARCH).o
else
EFI_CRT_OBJS ?= $(EFI_PATH)/crt0-efi-$(ARCH).o
endif
EFI_LDS = elf_$(ARCH)_efi.lds
DEFAULT_LOADER := \\\\grub.efi
@ -137,9 +143,15 @@ SUBSYSTEM := 0xa
LDFLAGS += --defsym=EFI_SUBSYSTEM=$(SUBSYSTEM)
endif
ifeq ($(ARCH),ia32)
FORMAT := -O binary
SUBSYSTEM := 0xa
LDFLAGS += --defsym=EFI_SUBSYSTEM=$(SUBSYSTEM)
endif
FORMAT ?= --target efi-app-$(ARCH)
crt0-efi-x86_64.o : crt0-efi-x86_64.S
crt0-efi-$(ARCH).o : crt0-efi-$(ARCH).S
$(CC) $(CFLAGS) -DEFI_SUBSYSTEM=$(SUBSYSTEM) -c -o $@ $<
%.efi: %.so

180
crt0-efi-ia32.S Normal file
View File

@ -0,0 +1,180 @@
/* crt0-efi-x86_64.S - x86_64 EFI startup code.
*
* Copyright 2014 Red Hat, Inc. <pjones@redhat.com>
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
.section .text.head
/*
* Magic "MZ" signature for PE/COFF
*/
.globl ImageBase
ImageBase:
.ascii "MZ"
.skip 58 // 'MZ' + pad + offset == 64
.long pe_header - ImageBase // Offset to the PE header.
.long 0x0eba1f0e /* terrifying code */
.long 0xcd09b400 /* terrifying code */
.long 0x4c01b821 /* terrifying code */
.short 0x21cd /* terrfiying code */
.ascii "The only winning move is not to play.\r\r\n$" /* DOS text */
.skip 9
pe_header:
.ascii "PE"
.short 0
coff_header:
.short 0x014c // i386
.short 1 // nr_sections
.long 0 // TimeDateStamp
.long 0 // PointerToSymbolTable
.long 0 // NumberOfSymbols
.short section_table - optional_header // SizeOfOptionalHeader
.short 0x306 // Characteristics.
// IMAGE_FILE_DEBUG_STRIPPED |
// IMAGE_FILE_EXECUTABLE_IMAGE |
// IMAGE_FILE_LINE_NUMS_STRIPPED
// | IMAGE_FILE_32BIT_MACHINE
optional_header:
.short 0x10b // PE32+ format
.byte 0x02 // MajorLinkerVersion
.byte 0x18 // MinorLinkerVersion
.long _edata - _start // SizeOfCode
.long 0 // SizeOfInitializedData
.long 0 // SizeOfUninitializedData
.long _start - ImageBase // AddressOfEntryPoint
.long _start - ImageBase // BaseOfCode
.long 0 // BaseOfData
extra_header_fields:
.long 0 // ImageBase
.long 0x20 // SectionAlignment
.long 0x8 // FileAlignment
.short 0 // MajorOperatingSystemVersion
.short 0 // MinorOperatingSystemVersion
.short 0 // MajorImageVersion
.short 0 // MinorImageVersion
.short 0 // MajorSubsystemVersion
.short 0 // MinorSubsystemVersion
.long 0 // Win32VersionValue
.long _edata - ImageBase // SizeOfImage
// Everything before the kernel image is considered part of the header
.long _start - ImageBase // SizeOfHeaders
.long 0 // CheckSum
.short EFI_SUBSYSTEM // Subsystem
.short 0 // DllCharacteristics
.long 0 // SizeOfStackReserve
.long 0 // SizeOfStackCommit
.long 0 // SizeOfHeapReserve
.long 0 // SizeOfHeapCommit
.long 0 // LoaderFlags
.long 0x10 // NumberOfRvaAndSizes
.quad 0 // ExportTable
.quad 0 // ImportTable
.quad 0 // ResourceTable
.quad 0 // ExceptionTable
.quad 0 // CertificationTable
.quad 0 // BaseRelocationTable
.quad 0 // DebugTable
.quad 0 // ArchTable
.quad 0 // GlobalPointerTable
.quad 0 // .tls
.quad 0 // LoadConfigTable
.quad 0 // BoundImportsTable
.quad 0 // ImportAddressTable
.quad 0 // DelayLoadImportTable
.quad 0 // ClrRuntimeHeader (.cor)
.quad 0 // Reserved
// Section table
section_table:
.ascii ".text"
.byte 0
.byte 0
.byte 0 // end of 0 padding of section name
.long _edata - _start // VirtualSize
.long _start - ImageBase // VirtualAddress
.long _edata - _start // SizeOfRawData
.long _start - ImageBase // PointerToRawData
.long 0 // PointerToRelocations (0 for executables)
.long 0 // PointerToLineNumbers (0 for executables)
.short 0 // NumberOfRelocations (0 for executables)
.short 0 // NumberOfLineNumbers (0 for executables)
.long 0x60500020 // Characteristics (section flags)
/*
* The EFI application loader requires a relocation section
* because EFI applications must be relocatable. This is a
* dummy section as far as we are concerned.
*/
.ascii ".reloc"
.byte 0
.byte 0 // end of 0 padding of section name
.long 0 // VirtualSize
.long 0 // VirtualAddress
.long 0 // SizeOfRawData
.long 0 // PointerToRawData
.long 0 // PointerToRelocations
.long 0 // PointerToLineNumbers
.short 0 // NumberOfRelocations
.short 0 // NumberOfLineNumbers
.long 0x42100040 // Characteristics (section flags)
/* most if not all ia32 binaries binutils makes seem to have .text
* starting at 0x400; no reason to assume that's a bad idea. */
.align 1024
_start:
pushl %ebp
movl %esp,%ebp
pushl 12(%ebp) # copy "image" argument
pushl 8(%ebp) # copy "systab" argument
call 0f
0: popl %eax
movl %eax,%ebx
addl $ImageBase-0b,%eax # %eax = ldbase
addl $_DYNAMIC-0b,%ebx # %ebx = _DYNAMIC
pushl %ebx # pass _DYNAMIC as second argument
pushl %eax # pass ldbase as first argument
call _relocate
popl %ebx
popl %ebx
testl %eax,%eax
jne .exit
call efi_main # call app with "image" and "systab" argument
.exit:
leave
ret

83
elf_ia32_efi.lds
View File

@ -3,61 +3,56 @@ OUTPUT_ARCH(i386)
ENTRY(_start)
SECTIONS
{
. = 0;
ImageBase = .;
.hash : { *(.hash) } /* this MUST come first! */
. = ALIGN(4096);
.text :
{
*(.text)
*(.text.*)
*(.gnu.linkonce.t.*)
.text 0x0 : {
*(.text.head)
*(.text)
*(.text.*)
*(.gnu.linkonce.t.*)
*(.srodata)
*(.rodata*)
. = ALIGN(16);
_etext = .;
}
.reloc :
{
*(.reloc)
}
. = ALIGN(4096);
.dynamic : { *(.dynamic) }
.data :
{
*(.rodata*)
*(.data)
*(.data1)
*(.data.*)
*(.sdata)
*(.got.plt)
*(.got)
/* the EFI loader doesn't seem to like a .bss section, so we stick
it all into .data: */
*(.sbss)
*(.scommon)
*(.dynbss)
*(.bss)
*(COMMON)
*(.sdata)
*(.data)
*(.data1)
*(.data.*)
*(.got.plt)
*(.got)
/* the EFI loader doesn't seem to like a .bss section, so we stick
* it all into .data: */
. = ALIGN(16);
_bss = .;
*(.sbss)
*(.scommon)
*(.dynbss)
*(.bss)
*(COMMON)
. = ALIGN(16);
_bss_end = .;
}
. = ALIGN(4096);
.vendor_cert :
{
*(.vendor_cert)
*(.vendor_cert)
}
. = ALIGN(4096);
.dynamic : { *(.dynamic) }
.rel.dyn : { *(.rel.dyn) }
.rel.plt : { *(.rel.plt) }
.rel.got : { *(.rel.got) }
.rel.data : { *(.rel.data) *(.rel.data*) }
_edata = .;
_data_size = . - _etext;
. = ALIGN(4096);
.rel :
{
*(.rel.data)
*(.rel.data.*)
*(.rel.got)
*(.rel.stab)
*(.data.rel.ro.local)
*(.data.rel.local)
*(.data.rel.ro)
*(.data.rel*)
}
.dynsym : { *(.dynsym) }
. = ALIGN(4096);
.dynsym : { *(.dynsym) }
. = ALIGN(4096);
.dynstr : { *(.dynstr) }
.dynstr : { *(.dynstr) }
. = ALIGN(4096);
/DISCARD/ :
{