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98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/* Support for reading ELF files.
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Copyright (C) 1999-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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int process_elf32_file (const char *file_name, const char *lib,
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int *flag, unsigned int *isa_level, char **soname,
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void *file_contents, size_t file_length);
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int process_elf64_file (const char *file_name, const char *lib,
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int *flag, unsigned int *isa_level, char **soname,
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void *file_contents, size_t file_length);
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/* The ELF flags supported by our current glibc port:
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- EF_RISCV_FLOAT_ABI: We support the soft and double ABIs.
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- EF_RISCV_RVC: While the Linux ABI mandates the presence of the C
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extension, we can still support libraries compiled without that extension
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so we just ignore this flag.
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- EF_RISCV_RVE: glibc (and Linux) don't support RV32E based systems.
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- EF_RISCV_TSO: The TSO extension isn't supported, as doing so would require
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some mechanism to ensure that the TSO extension is enabled which doesn't
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currently exist. */
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#define SUPPORTED_ELF_FLAGS (EF_RISCV_FLOAT_ABI | EF_RISCV_RVC)
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/* Returns 0 if everything is ok, != 0 in case of error. */
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int
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process_elf_file (const char *file_name, const char *lib, int *flag,
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unsigned int *isa_level, char **soname, void *file_contents,
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size_t file_length)
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{
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ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents;
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Elf32_Ehdr *elf32_header = (Elf32_Ehdr *) elf_header;
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Elf64_Ehdr *elf64_header = (Elf64_Ehdr *) elf_header;
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int ret;
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long flags;
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/* RISC-V libraries are always libc.so.6+. */
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*flag = FLAG_ELF_LIBC6;
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if (elf_header->e_ident [EI_CLASS] == ELFCLASS32)
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{
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ret = process_elf32_file (file_name, lib, flag, isa_level, soname,
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file_contents, file_length);
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flags = elf32_header->e_flags;
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}
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else
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{
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ret = process_elf64_file (file_name, lib, flag, isa_level, soname,
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file_contents, file_length);
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flags = elf64_header->e_flags;
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}
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/* RISC-V linkers encode the floating point ABI as part of the ELF headers. */
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switch (flags & EF_RISCV_FLOAT_ABI)
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{
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case EF_RISCV_FLOAT_ABI_SOFT:
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*flag |= FLAG_RISCV_FLOAT_ABI_SOFT;
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break;
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case EF_RISCV_FLOAT_ABI_DOUBLE:
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*flag |= FLAG_RISCV_FLOAT_ABI_DOUBLE;
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break;
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default:
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return 1;
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}
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/* If there are any other ELF flags set then glibc doesn't support this
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library. */
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if (flags & ~SUPPORTED_ELF_FLAGS)
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return 1;
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return ret;
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}
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#undef __ELF_NATIVE_CLASS
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#undef process_elf_file
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#define process_elf_file process_elf32_file
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#define __ELF_NATIVE_CLASS 32
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#include "elf/readelflib.c"
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#undef __ELF_NATIVE_CLASS
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#undef process_elf_file
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#define process_elf_file process_elf64_file
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#define __ELF_NATIVE_CLASS 64
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#include "elf/readelflib.c"
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