Add non-objcopy IA32 crt0/lds

* Needed by embedded (MacOS) ELF toolchain

Signed-off-by: Callum Farmer <gmbr3@opensuse.org>
This commit is contained in:
Callum Farmer 2024-07-16 11:37:27 +01:00
parent 644e03821e
commit e092a94869
No known key found for this signature in database
GPG Key ID: 9A5B19E18CD0013C
3 changed files with 319 additions and 2 deletions

View File

@ -80,7 +80,7 @@ endif
# on aarch64, avoid jump tables before all relocations have been processed # on aarch64, avoid jump tables before all relocations have been processed
reloc_aarch64.o: CFLAGS += -fno-jump-tables reloc_aarch64.o: CFLAGS += -fno-jump-tables
ifneq (,$(filter $(ARCH),aarch64 riscv64)) ifneq (,$(filter $(ARCH),aarch64 riscv64 ia32))
CRT0_LOCAL_TARGET = crt0-efi-$(ARCH)-local.o CRT0_LOCAL_TARGET = crt0-efi-$(ARCH)-local.o
endif endif
@ -116,7 +116,7 @@ ifneq (,$(findstring FreeBSD,$(OS)))
ifeq ($(ARCH),x86_64) ifeq ($(ARCH),x86_64)
$(INSTALL) -m 644 $(SRCDIR)/elf_$(ARCH)_fbsd_efi.lds $(INSTALLROOT)$(LIBDIR) $(INSTALL) -m 644 $(SRCDIR)/elf_$(ARCH)_fbsd_efi.lds $(INSTALLROOT)$(LIBDIR)
else else
ifneq (,$(filter $(ARCH),aarch64 riscv64)) ifneq (,$(filter $(ARCH),aarch64 riscv64 ia32))
$(INSTALL) -m 644 $(SRCDIR)/elf_$(ARCH)_efi_local.lds $(INSTALLROOT)$(LIBDIR) $(INSTALL) -m 644 $(SRCDIR)/elf_$(ARCH)_efi_local.lds $(INSTALLROOT)$(LIBDIR)
endif endif
$(INSTALL) -m 644 $(SRCDIR)/elf_$(ARCH)_efi.lds $(INSTALLROOT)$(LIBDIR) $(INSTALL) -m 644 $(SRCDIR)/elf_$(ARCH)_efi.lds $(INSTALLROOT)$(LIBDIR)

View File

@ -0,0 +1,176 @@
.section .text.head
/*
* Magic "MZ" signature for PE/COFF
*/
.globl ImageBase
ImageBase:
.ascii "MZ"
.skip 58 // 'MZ' + pad + offset == 64
.4byte pe_header - ImageBase // Offset to the PE header.
pe_header:
.ascii "PE"
.2byte 0
coff_header:
.2byte 0x14c // i386+
.2byte 4 // nr_sections
.4byte 0 // TimeDateStamp
.4byte 0 // PointerToSymbolTable
.4byte 0 // NumberOfSymbols
.2byte section_table - optional_header // SizeOfOptionalHeader
.2byte 0x306 // Characteristics.
// IMAGE_FILE_32BIT_MACHINE |
// IMAGE_FILE_DEBUG_STRIPPED |
// IMAGE_FILE_EXECUTABLE_IMAGE |
// IMAGE_FILE_LINE_NUMS_STRIPPED
optional_header:
.2byte 0x10b // PE32+ format
.byte 0x02 // MajorLinkerVersion
.byte 0x14 // MinorLinkerVersion
.4byte _etext - _start // SizeOfCode
.4byte _alldata_size - ImageBase // SizeOfInitializedData
.4byte 0 // SizeOfUninitializedData
.4byte _start - ImageBase // AddressOfEntryPoint
.4byte _start - ImageBase // BaseOfCode
.4byte _reloc - ImageBase // BaseOfData
extra_header_fields:
.4byte 0 // ImageBase
.4byte 0x1000 // SectionAlignment
.4byte 0x1000 // FileAlignment
.2byte 0 // MajorOperatingSystemVersion
.2byte 0 // MinorOperatingSystemVersion
.2byte 0 // MajorImageVersion
.2byte 0 // MinorImageVersion
.2byte 0 // MajorSubsystemVersion
.2byte 0 // MinorSubsystemVersion
.4byte 0 // Win32VersionValue
.4byte _image_end - ImageBase // SizeOfImage
// Everything before the kernel image is considered part of the header
.4byte _start - ImageBase // SizeOfHeaders
.4byte 0 // CheckSum
.2byte EFI_SUBSYSTEM // Subsystem
.2byte 0 // DllCharacteristics
.4byte 0 // SizeOfStackReserve
.4byte 0 // SizeOfStackCommit
.4byte 0 // SizeOfHeapReserve
.4byte 0 // SizeOfHeapCommit
.4byte 0 // LoaderFlags
.4byte 0x10 // NumberOfRvaAndSizes
.8byte 0 // ExportTable
.8byte 0 // ImportTable
.8byte 0 // ResourceTable
.8byte 0 // ExceptionTable
.8byte 0 // CertificationTable
.4byte _reloc - ImageBase // BaseRelocationTable (VirtualAddress)
.4byte _reloc_vsize - ImageBase // BaseRelocationTable (Size)
.8byte 0 // Debug
.8byte 0 // Architecture
.8byte 0 // Global Ptr
.8byte 0 // TLS Table
.8byte 0 // Load Config Table
.8byte 0 // Bound Import
.8byte 0 // IAT
.8byte 0 // Delay Import Descriptor
.8byte 0 // CLR Runtime Header
.8byte 0 // Reserved, must be zero
// Section table
section_table:
.ascii ".text\0\0\0"
.4byte _evtext - _start // VirtualSize
.4byte _start - ImageBase // VirtualAddress
.4byte _etext - _start // SizeOfRawData
.4byte _start - ImageBase // PointerToRawData
.4byte 0 // PointerToRelocations (0 for executables)
.4byte 0 // PointerToLineNumbers (0 for executables)
.2byte 0 // NumberOfRelocations (0 for executables)
.2byte 0 // NumberOfLineNumbers (0 for executables)
.4byte 0x60000020 // 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\0\0"
.4byte _reloc_vsize - ImageBase // VirtualSize
.4byte _reloc - ImageBase // VirtualAddress
.4byte _reloc_size - ImageBase // SizeOfRawData
.4byte _reloc - ImageBase // PointerToRawData
.4byte 0 // PointerToRelocations
.4byte 0 // PointerToLineNumbers
.2byte 0 // NumberOfRelocations
.2byte 0 // NumberOfLineNumbers
.4byte 0x42000040 // Characteristics (section flags)
.ascii ".data\0\0\0"
.4byte _data_vsize - ImageBase // VirtualSize
.4byte _data - ImageBase // VirtualAddress
.4byte _data_size - ImageBase // SizeOfRawData
.4byte _data - ImageBase // PointerToRawData
.4byte 0 // PointerToRelocations
.4byte 0 // PointerToLineNumbers
.2byte 0 // NumberOfRelocations
.2byte 0 // NumberOfLineNumbers
.4byte 0xC0000040 // Characteristics (section flags)
.ascii ".rodata\0"
.4byte _rodata_vsize - ImageBase // VirtualSize
.4byte _rodata - ImageBase // VirtualAddress
.4byte _rodata_size - ImageBase // SizeOfRawData
.4byte _rodata - ImageBase // PointerToRawData
.4byte 0 // PointerToRelocations
.4byte 0 // PointerToLineNumbers
.2byte 0 // NumberOfRelocations
.2byte 0 // NumberOfLineNumbers
.4byte 0x40000040 // Characteristics (section flags)
.globl _start
.type _start,%function
_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 _entry # call app with "image" and "systab" argument
.exit: leave
ret
// hand-craft a dummy .reloc section so EFI knows it's a relocatable executable:
.data
dummy: .4byte 0
#define IMAGE_REL_ABSOLUTE 0
.section .reloc
.4byte dummy // Page RVA
.4byte 12 // Block Size (2*4+2*2), must be aligned by 32 Bits
.2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy
.2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy
#if defined(__ELF__) && defined(__linux__)
.section .note.GNU-stack,"",%progbits
#endif

View File

@ -0,0 +1,141 @@
OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
OUTPUT_ARCH(i386)
ENTRY(_start)
SECTIONS
{
.text 0 : {
*(.text.head)
. = ALIGN(4096);
_text = .;
*(.text)
*(.text.*)
*(.gnu.linkonce.t.*)
*(.plt)
. = ALIGN(16);
_evtext = .;
. = ALIGN(4096);
_etext = .;
} =0
_text_vsize = _evtext - _text;
_text_size = _etext - _text;
. = ALIGN(4096);
_reloc = .;
.reloc : {
*(.reloc)
_evreloc = .;
. = ALIGN(4096);
_ereloc = .;
} =0
_reloc_vsize = _evreloc - _reloc;
_reloc_size = _ereloc - _reloc;
. = ALIGN(4096);
_data = .;
_DYNAMIC = .;
.dynamic : { *(.dynamic) }
. = ALIGN(4096);
.data :
{
*(.sdata)
*(.data)
*(.data1)
*(.data.*)
*(.got.plt)
*(.got)
/*
* Note that these aren't the using the GNU "CONSTRUCTOR" output section
* command, so they don't start with a size. Because of p2align and the
* end/END definitions, and the fact that they're mergeable, they can also
* have NULLs which aren't guaranteed to be at the end.
*/
. = ALIGN(16);
__init_array_start = .;
*(SORT(.init_array.*))
*(.init_array)
__init_array_end = .;
. = ALIGN(16);
__CTOR_LIST__ = .;
*(SORT(.ctors.*))
*(.ctors)
__CTOR_END__ = .;
. = ALIGN(16);
__DTOR_LIST__ = .;
*(SORT(.dtors.*))
*(.dtors)
__DTOR_END__ = .;
. = ALIGN(16);
__fini_array_start = .;
*(SORT(.fini_array.*))
*(.fini_array)
__fini_array_end = .;
/* 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)
*(.bss.*)
*(COMMON)
. = ALIGN(16);
_bss_end = .;
_evdata = .;
. = ALIGN(4096);
_edata = .;
} =0
_data_vsize = _evdata - _data;
_data_size = _edata - _data;
. = ALIGN(4096);
_rodata = .;
.rela :
{
*(.rela.text*)
*(.rela.data*)
*(.rela.got)
*(.rela.dyn)
*(.rela.stab)
*(.rela.init_array*)
*(.rela.fini_array*)
*(.rela.ctors*)
*(.rela.dtors*)
}
. = ALIGN(4096);
.rela.plt : { *(.rela.plt) }
. = ALIGN(4096);
.rodata : {
*(.rodata*)
_evrodata = .;
. = ALIGN(4096);
_erodata = .;
} =0
_rodata_vsize = _evrodata - _rodata;
_rodata_size = _erodata - _rodata;
_image_end = .;
_alldata_size = _image_end - _reloc;
. = ALIGN(4096);
.dynsym : { *(.dynsym) }
. = ALIGN(4096);
.dynstr : { *(.dynstr) }
. = ALIGN(4096);
.note.gnu.build-id : { *(.note.gnu.build-id) }
. = ALIGN(4096);
.hash : { *(.hash) }
. = ALIGN(4096);
.gnu.hash : { *(.gnu.hash) }
. = ALIGN(4096);
.eh_frame : { *(.eh_frame) }
.eh_frame_hdr : { *(.eh_frame_hdr) }
. = ALIGN(4096);
.gcc_except_table : { *(.gcc_except_table*) }
/DISCARD/ :
{
*(.rela.reloc)
*(.note.GNU-stack)
}
.comment 0 : { *(.comment) }
}