new file mode 100644
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+/* SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause */
+/*
+ * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
+ * Copright (C) 2018 Alexander Graf <agraf@suse.de>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice and this list of conditions, without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License as published by the Free Software Foundation;
+ * either version 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef EFI_SUBSYSTEM
+#define EFI_SUBSYSTEM 10
+#endif
+
+ .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 0x5064 // riscv64
+ .2byte 4 // nr_sections
+ .4byte 0 // TimeDateStamp
+ .4byte 0 // PointerToSymbolTable
+ .4byte 0 // NumberOfSymbols
+ .2byte section_table - optional_header // SizeOfOptionalHeader
+ .2byte 0x206 // Characteristics.
+ // IMAGE_FILE_DEBUG_STRIPPED |
+ // IMAGE_FILE_EXECUTABLE_IMAGE |
+ // IMAGE_FILE_LINE_NUMS_STRIPPED
+optional_header:
+ .2byte 0x20b // PE32+ format
+ .byte 0x02 // MajorLinkerVersion
+ .byte 0x14 // MinorLinkerVersion
+ .4byte _text_size - ImageBase // SizeOfCode
+ .4byte _alldata_size - ImageBase // SizeOfInitializedData
+ .4byte 0 // SizeOfUninitializedData
+ .4byte _start - ImageBase // AddressOfEntryPoint
+ .4byte _text - ImageBase // BaseOfCode
+
+extra_header_fields:
+ .8byte 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 _text - ImageBase // SizeOfHeaders
+ .4byte 0 // CheckSum
+ .2byte EFI_SUBSYSTEM // Subsystem
+ .2byte 0 // DllCharacteristics
+ .8byte 0 // SizeOfStackReserve
+ .8byte 0 // SizeOfStackCommit
+ .8byte 0 // SizeOfHeapReserve
+ .8byte 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 _text_vsize - ImageBase // VirtualSize
+ .4byte _text - ImageBase // VirtualAddress
+ .4byte _text_size - ImageBase // SizeOfRawData
+ .4byte _text - 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)
+
+ .text
+ .globl _start
+ .type _start,%function
+_start:
+ addi sp, sp, -24
+ sd a0, 0(sp)
+ sd a1, 8(sp)
+ sd ra, 16(sp)
+ lla a0, ImageBase
+ lla a1, _DYNAMIC
+ call _relocate
+ bne a0, zero, 0f
+ ld a1, 8(sp)
+ ld a0, 0(sp)
+ call _entry
+ ld ra, 16(sp)
+0: addi sp, sp, 24
+ 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, "a"
+label1:
+ .4byte dummy-label1 // 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
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+/* SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause */
+
+OUTPUT_FORMAT("elf64-littleriscv", "elf64-littleriscv", "elf64-littleriscv")
+OUTPUT_ARCH(riscv)
+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) }
+ . = 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) }
+ . = ALIGN(4096);
+ .gcc_except_table : { *(.gcc_except_table*) }
+ /DISCARD/ :
+ {
+ *(.rela.reloc)
+ *(.note.GNU-stack)
+ }
+ .comment 0 : { *(.comment) }
+}
+
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@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+/* reloc_riscv.c - position independent ELF shared object relocator
+ Copyright (C) 2018 Alexander Graf <agraf@suse.de>
+ Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
+ Copyright (C) 1999 Hewlett-Packard Co.
+ Contributed by David Mosberger <davidm@hpl.hp.com>.
+
+ All rights reserved.
+
+ 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.
+ * Neither the name of Hewlett-Packard Co. nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ 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 OWNER OR CONTRIBUTORS
+ BE LIABLE FOR ANYDIRECT, 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.
+*/
+
+#include <efi.h>
+
+#include <elf.h>
+
+#define Elf_Dyn Elf64_Dyn
+#define Elf_Rela Elf64_Rela
+#define ELF_R_TYPE ELF64_R_TYPE
+
+EFI_STATUS EFIAPI _relocate(long ldbase, Elf_Dyn *dyn)
+{
+ long relsz = 0, relent = 0;
+ Elf_Rela *rel = NULL;
+ unsigned long *addr;
+ int i;
+
+ for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
+ switch (dyn[i].d_tag) {
+ case DT_RELA:
+ rel = (Elf_Rela *)((unsigned long)dyn[i].d_un.d_ptr + ldbase);
+ break;
+ case DT_RELASZ:
+ relsz = dyn[i].d_un.d_val;
+ break;
+ case DT_RELAENT:
+ relent = dyn[i].d_un.d_val;
+ break;
+ default:
+ break;
+ }
+ }
+
+ if (!rel && relent == 0)
+ return EFI_SUCCESS;
+
+ if (!rel || relent == 0)
+ return EFI_LOAD_ERROR;
+
+ while (relsz > 0) {
+ /* apply the relocs */
+ switch (ELF_R_TYPE(rel->r_info)) {
+ case R_RISCV_RELATIVE:
+ addr = (unsigned long *)(ldbase + rel->r_offset);
+ *addr = ldbase + rel->r_addend;
+ break;
+ default:
+ break;
+ }
+ rel = (Elf_Rela *)((char *)rel + relent);
+ relsz -= relent;
+ }
+ return EFI_SUCCESS;
+}
Signed-off-by: Andrew Jones <andrew.jones@linux.dev> --- riscv/efi/crt0-efi-riscv64.S | 187 ++++++++++++++++++++++++++++++++++ riscv/efi/elf_riscv64_efi.lds | 142 ++++++++++++++++++++++++++ riscv/efi/reloc_riscv64.c | 90 ++++++++++++++++ 3 files changed, 419 insertions(+) create mode 100644 riscv/efi/crt0-efi-riscv64.S create mode 100644 riscv/efi/elf_riscv64_efi.lds create mode 100644 riscv/efi/reloc_riscv64.c