mirror of
https://github.com/projectacrn/acrn-hypervisor.git
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1dee977429
This patch implements relocation support for ACRN RISC-V to enable position-independent execution. The hypervisor can now be loaded at any physical address and will automatically relocate itself at runtime. Key changes: - Add relocate() function to process R_RISCV_RELATIVE relocations in .rela sections during early boot - Implement arch_get_hv_image_delta() to calculate the load address offset from the configured base address - Add relocation processing in cpu_entry.S before jumping to C code - Update linker script to include .rela sections for relocation data - Define R_RISCV_RELATIVE relocation type and linker symbol definitions Tracked-On: #8825 Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com> Acked-by: Wang, Yu1 <yu1.wang@intel.com>
195 lines
6.2 KiB
C
195 lines
6.2 KiB
C
/*
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* Copyright (C) 2021 Intel Corporation.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2017, 2018 Dell EMC
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* Copyright (c) 2000, 2001, 2008, 2011, David E. O'Brien
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* Copyright (c) 1998 John D. Polstra.
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* All rights reserved.
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*/
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/*
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* source:
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* https://github.com/freebsd/freebsd-src/blob/main/sys/sys/elf_common.h
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*/
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#ifndef ELF_H
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#define ELF_H
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/* Indexes into the e_ident array. Keep synced with
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http://www.sco.com/developers/gabi/latest/ch4.eheader.html */
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#define EI_MAG0 0 /* Magic number, byte 0. */
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#define EI_MAG1 1 /* Magic number, byte 1. */
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#define EI_MAG2 2 /* Magic number, byte 2. */
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#define EI_MAG3 3 /* Magic number, byte 3. */
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#define EI_CLASS 4 /* Class of machine. */
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#define EI_DATA 5 /* Data format. */
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#define EI_VERSION 6 /* ELF format version. */
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#define EI_OSABI 7 /* Operating system / ABI identification */
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#define EI_ABIVERSION 8 /* ABI version */
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#define OLD_EI_BRAND 8 /* Start of architecture identification. */
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#define EI_PAD 9 /* Start of padding (per SVR4 ABI). */
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#define EI_NIDENT 16 /* Size of e_ident array. */
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/* Values for the magic number bytes. */
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#define ELFMAGIC 0x464C457f
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/* Values for e_ident[EI_CLASS]. */
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#define ELFCLASSNONE 0 /* Unknown class. */
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#define ELFCLASS32 1 /* 32-bit architecture. */
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#define ELFCLASS64 2 /* 64-bit architecture. */
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/* Values for e_type of program entry */
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#define ET_NONE 0 /* Unknown type. */
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#define ET_REL 1 /* Relocatable. */
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#define ET_EXEC 2 /* Executable. */
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#define ET_DYN 3 /* Shared object. */
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#define ET_CORE 4 /* Core file. */
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#define ET_LOOS 0xfe00 /* First operating system specific. */
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#define ET_HIOS 0xfeff /* Last operating system-specific. */
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#define ET_LOPROC 0xff00 /* First processor-specific. */
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#define ET_HIPROC 0xffff /* Last processor-specific. */
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/* Values for p_type of program entry */
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#define PT_NULL 0 /* Unused entry. */
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#define PT_LOAD 1 /* Loadable segment. */
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#define PT_DYNAMIC 2 /* Dynamic linking information segment. */
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#define PT_INTERP 3 /* Pathname of interpreter. */
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#define PT_NOTE 4 /* Auxiliary information. */
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#define PT_SHLIB 5 /* Reserved (not used). */
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#define PT_PHDR 6 /* Location of program header itself. */
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#define PT_TLS 7 /* Thread local storage segment */
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/* Header struct for elf64 file */
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struct elf64_hdr
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{
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uint8_t e_ident[EI_NIDENT]; /*ELF identification */
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uint16_t e_type; /*Object file type */
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uint16_t e_machine; /*Machine type */
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uint32_t e_version; /*Object file version */
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uint64_t e_entry; /*Entry point address */
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uint64_t e_phoff; /*Program header offset */
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uint64_t e_shoff; /*Section header offset */
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uint32_t e_flags; /*Processor-specific flags */
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uint16_t e_ehsize; /*ELF header size */
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uint16_t e_phentsize; /*Size of program header entry */
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uint16_t e_phnum; /*Number of program header entries */
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uint16_t e_shentsize; /*Size of section header entry */
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uint16_t e_shnum; /*Number of section header entries */
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uint16_t e_shstrndx; /*Section name string table index */
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};
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/* Program entry struct for elf64, describes segments loaded in ram*/
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struct elf64_prog_entry
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{
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uint32_t p_type; /* Type of segment */
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uint32_t p_flags; /* Segment attributes */
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uint64_t p_offset; /* Offset in file */
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uint64_t p_vaddr; /* Virtual address in memory */
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uint64_t p_paddr; /* Physical address in memory */
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uint64_t p_filesz; /* Size of segment in file */
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uint64_t p_memsz; /* Size of segment in memory */
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uint64_t p_align; /* Alignment of segment */
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};
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/* Section entry struct for elf64, contains sections info of the program*/
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struct elf64_sec_entry
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{
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uint32_t sh_name; /*Section name */
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uint32_t sh_type; /*Section type */
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uint64_t sh_flags; /*Section attributes */
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uint64_t sh_addr; /*Virtual address in memory */
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uint64_t sh_offset; /*Offset in file */
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uint64_t sh_size; /*Size of section */
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uint32_t sh_link; /*Link to other section */
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uint32_t sh_info; /*Miscellaneous information */
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uint64_t sh_addralign; /*Address alignment boundary */
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uint64_t sh_entsize; /*Size of entries, if section has table */
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};
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/* Header struct for elf32 file */
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struct elf32_hdr
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{
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uint8_t e_ident[EI_NIDENT]; /*ELF identification */
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uint16_t e_type; /*Object file type */
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uint16_t e_machine; /*Machine type */
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uint32_t e_version; /*Object file version */
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uint32_t e_entry; /*Entry point address */
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uint32_t e_phoff; /*Program header offset */
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uint32_t e_shoff; /*Section header offset */
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uint32_t e_flags; /*Processor-specific flags */
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uint16_t e_ehsize; /*ELF header size */
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uint16_t e_phentsize; /*Size of program header entry */
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uint16_t e_phnum; /*Number of program header entries */
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uint16_t e_shentsize; /*Size of section header entry */
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uint16_t e_shnum; /*Number of section header entries */
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uint16_t e_shstrndx; /*Section name string table index */
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};
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/* Program entry struct for elf32, describes segments loaded in ram*/
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struct elf32_prog_entry
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{
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uint32_t p_type; /* Type of segment */
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uint32_t p_offset; /* Offset in file */
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uint32_t p_vaddr; /* Virtual address in memory */
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uint32_t p_paddr; /* Physical address in memory */
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uint32_t p_filesz; /* Size of segment in file */
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uint32_t p_memsz; /* Size of segment in memory */
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uint32_t p_flags; /* Segment attributes */
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uint32_t p_align; /* Alignment of segment */
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};
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/* Section entry struct for elf32, contains sections info of the program*/
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struct elf32_sec_entry
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{
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uint32_t sh_name;
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uint32_t sh_type;
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uint32_t sh_flags;
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uint32_t sh_addr;
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uint32_t sh_offset;
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uint32_t sh_size;
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uint32_t sh_link;
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uint32_t sh_info;
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uint32_t sh_addralign;
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uint32_t sh_entsize;
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};
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/* Dynamic structure */
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struct Elf64_Dyn {
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uint64_t d_tag;
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uint64_t d_ptr;
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};
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/* external symbols that are helpful for relocation */
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extern struct Elf64_Dyn *_DYNAMIC;
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/* Dynamic Array Tags - d_tag */
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#define DT_NULL 0U /* end of .dynamic section */
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#define DT_RELA 7U /* relocation table */
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#define DT_RELASZ 8U /* size of reloc table */
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#define DT_RELAENT 9U /* size of one entry */
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/* Relocation entry with explicit addend */
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struct Elf64_Rel {
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uint64_t r_offset;
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uint64_t r_info;
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int64_t r_addend;
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};
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static inline uint64_t elf64_r_type(uint64_t i)
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{
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return (i & 0xffffffffUL);
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}
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/* x86-64 relocation types */
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#define R_X86_64_RELATIVE 8U
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/* RISC-V relocation types */
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#define R_RISCV_RELATIVE 3U
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#endif /* !ELF_H */
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