AArch64: Add support for AArch64 EFI (efi-*-aarch64).

This adds support for efi-*-aarch64 by virtue of adding a new PEI target
pei-aarch64-little.  This is not a full target and only exists to support EFI
at this time.

This means that this target does not support relocation processing and is mostly
a container format.  This format has been added to elf based aarch64 targets
such that efi images can be made natively on Linux.

However this target is not valid for use with gas but only with objcopy.

With these changes the resulting file is recognized as an efi image by
third party tools:

>  pecli info hello.efi

Metadata
================================================================================
MD5:            598c32a778b0f0deebe977fef8578c4e
SHA1:           4580121edd5cb4dc40f51b28f171fd15250df84c
SHA256:         3154bd7cf42433d1c957f6bf55a17ad8c57ed41b29df2d485703349fd6ff1d5c
Imphash:
Size:           47561 bytes
Type:           PE32+ executable (EFI application) (stripped to external PDB), for MS Windows
Compile Time:   1970-01-01 00:00:00 (UTC - 0x0       )
Entry point:    0x2000 (section .text)

Sections
================================================================================
Name      RWX  VirtSize   VirtAddr   RawAddr   RawSize   Entropy  md5
.text     R-X  0x5bb0     0x2000     0x400     0x5c00      6.39 551fbc264256a3f387de8a891500ae0d
.reloc    R--  0xc        0x8000     0x6000    0x200       0.02 0c45f6d812d079821c1d54c09ab89e1d
.data     RW-  0x1d88     0x9000     0x6200    0x1e00      4.18 5d1137c09f01289dc62bf754f7290db3
.dynamic  RW-  0xf0       0xb000     0x8000    0x200       0.34 5c94ed3206f05a277e6f04fbf131f131
.rela     R--  0xe58      0xc000     0x8200    0x1000      1.87 8b5c6bc30f3acb7ca7bf2e6789d68519
.dynsym   R--  0x138      0xd000     0x9200    0x200       0.96 bdcf5101da51aadc663ca8859f88138c

Imports
================================================================================

Any magic number is based on the Microsoft PE specification [1].

[1] https://docs.microsoft.com/en-us/windows/win32/debug/pe-format

bfd/ChangeLog:

2021-10-21  Tamar Christina  <tamar.christina@arm.com>

	PR binutils/26206
	* .gitignore (pe-aarch64igen.c): New.
	* Makefile.am (pei-aarch64.lo, pe-aarch64igen.lo, pei-aarch64.c,
	pe-aarch64igen.c): Add support.
	* Makefile.in: Likewise.
	* bfd.c (bfd_get_sign_extend_vma): Add pei-aarch64-little.
	* coff-aarch64.c: New file.
	* coffcode.h (coff_set_arch_mach_hook, coff_set_flags,
	coff_write_object_contents) Add aarch64 (aarch64_pei_vec) support.
	* config.bfd: Likewise.
	* configure: Likewise.
	* configure.ac: Likewise.
	* libpei.h (GET_OPTHDR_IMAGE_BASE, PUT_OPTHDR_IMAGE_BASE,
	GET_OPTHDR_SIZE_OF_STACK_RESERVE, PUT_OPTHDR_SIZE_OF_STACK_RESERVE,
	GET_OPTHDR_SIZE_OF_STACK_COMMIT, PUT_OPTHDR_SIZE_OF_STACK_COMMIT,
	GET_OPTHDR_SIZE_OF_HEAP_RESERVE, PUT_OPTHDR_SIZE_OF_HEAP_RESERVE,
	GET_OPTHDR_SIZE_OF_HEAP_COMMIT, PUT_OPTHDR_SIZE_OF_HEAP_COMMIT,
	GET_PDATA_ENTRY, _bfd_peAArch64_bfd_copy_private_bfd_data_common,
	_bfd_peAArch64_bfd_copy_private_section_data,
	_bfd_peAArch64_get_symbol_info, _bfd_peAArch64_only_swap_filehdr_out,
	_bfd_peAArch64_print_private_bfd_data_common,
	_bfd_peAArch64i_final_link_postscript,
	_bfd_peAArch64i_only_swap_filehdr_out, _bfd_peAArch64i_swap_aouthdr_in,
	_bfd_peAArch64i_swap_aouthdr_out, _bfd_peAArch64i_swap_aux_in,
	_bfd_peAArch64i_swap_aux_out, _bfd_peAArch64i_swap_lineno_in,
	_bfd_peAArch64i_swap_lineno_out, _bfd_peAArch64i_swap_scnhdr_out,
	_bfd_peAArch64i_swap_sym_in, _bfd_peAArch64i_swap_sym_out,
	_bfd_peAArch64i_swap_debugdir_in, _bfd_peAArch64i_swap_debugdir_out,
	_bfd_peAArch64i_write_codeview_record,
	_bfd_peAArch64i_slurp_codeview_record,
	_bfd_peAArch64_print_ce_compressed_pdata): New.
	* peXXigen.c (_bfd_XXi_swap_aouthdr_in, _bfd_XXi_swap_aouthdr_out,
	pe_print_pdata, _bfd_XX_print_private_bfd_data_common,
	_bfd_XX_bfd_copy_private_section_data, _bfd_XXi_final_link_postscript):
	Support COFF_WITH_peAArch64,
	* pei-aarch64.c: New file.
	* peicode.h (coff_swap_scnhdr_in, pe_ILF_build_a_bfd, pe_ILF_object_p):
	Support COFF_WITH_peAArch64.
	(jtab): Add dummy entry that traps.
	* targets.c (aarch64_pei_vec): New.

binutils/ChangeLog:

2021-10-21  Tamar Christina  <tamar.christina@arm.com>

	PR binutils/26206
	* NEWS: Add new support.
	* objcopy.c (convert_efi_target): Add efi-*-aarch64 support.
	* testsuite/binutils-all/aarch64/pei-aarch64-little.d: New test.
	* testsuite/binutils-all/aarch64/pei-aarch64-little.s: New test.

include/ChangeLog:

2021-10-21  Tamar Christina  <tamar.christina@arm.com>

	PR binutils/26206
	* coff/aarch64.h: New file.
	* coff/pe.h (IMAGE_FILE_MACHINE_ARM64): New.

2 files changed, 64 insertions, 0 deletions

diff --git a/include/coff/aarch64.h b/include/coff/aarch64.h
new file mode 100644
index 0000000..2c21f0d
--- /dev/null
+++ b/include/coff/aarch64.h
@@ -0,0 +1,63 @@
+/* AArch64 COFF support for BFD.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   This program 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.
+
+   This program 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 this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#define COFFAARCH64 1
+
+#define L_LNNO_SIZE 2
+#define INCLUDE_COMDAT_FIELDS_IN_AUXENT
+#include "coff/external.h"
+
+#define F_AARCH64_ARCHITECTURE_MASK	(0x4000)
+
+#define	AARCH64MAGIC	0xaa64  /* From Microsoft specification. */
+
+#undef  BADMAG
+#define BADMAG(x) ((x).f_magic != AARCH64MAGIC)
+#define AARCH64         1                 /* Customize coffcode.h.  */
+
+#define IMAGE_NT_OPTIONAL_HDR64_MAGIC      0x20b
+
+#define OMAGIC          0404    /* Object files, eg as output.  */
+#define ZMAGIC          IMAGE_NT_OPTIONAL_HDR64_MAGIC    /* Demand load format, eg normal ld output 0x10b.  */
+#define STMAGIC		0401	/* Target shlib.  */
+#define SHMAGIC		0443	/* Host   shlib.  */
+
+/* define some NT default values */
+/*  #define NT_IMAGE_BASE        0x400000 moved to internal.h */
+#define NT_SECTION_ALIGNMENT 0x1000
+#define NT_FILE_ALIGNMENT    0x200
+#define NT_DEF_RESERVE       0x100000
+#define NT_DEF_COMMIT        0x1000
+
+/* We use the .rdata section to hold read only data.  */
+#define _LIT	".rdata"
+
+/********************** RELOCATION DIRECTIVES **********************/
+struct external_reloc
+{
+  char r_vaddr[4];
+  char r_symndx[4];
+  char r_type[2];
+  char r_offset[4];
+};
+
+#define RELOC struct external_reloc
+#define RELSZ 14
+
+#define ARM_NOTE_SECTION ".note"
diff --git a/include/coff/pe.h b/include/coff/pe.h
index 9e1ea4b..558cf0e 100644
--- a/include/coff/pe.h
+++ b/include/coff/pe.h
@@ -137,6 +137,7 @@
 #define IMAGE_FILE_MACHINE_AM33              0x01d3
 #define IMAGE_FILE_MACHINE_AMD64             0x8664
 #define IMAGE_FILE_MACHINE_ARM               0x01c0
+#define IMAGE_FILE_MACHINE_ARM64             0xaa64
 #define IMAGE_FILE_MACHINE_AXP64             IMAGE_FILE_MACHINE_ALPHA64
 #define IMAGE_FILE_MACHINE_CEE               0xc0ee
 #define IMAGE_FILE_MACHINE_CEF               0x0cef