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efbbd9c33a
Store ISA level in the portion of the unused upper 32 bits of the hwcaps field in cache and the unused pad field in aux cache. ISA level is stored and checked only for shared objects in glibc-hwcaps subdirectories. The shared objects in the default directories aren't checked since there are no fallbacks for these shared objects. Tested on x86-64-v2, x86-64-v3 and x86-64-v4 machines with --disable-hardcoded-path-in-tests and --enable-hardcoded-path-in-tests.
100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
/* Support for reading ELF files.
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Copyright (C) 1999-2021 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 *osversion,
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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 *osversion,
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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 *osversion, unsigned int *isa_level,
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char **soname, void *file_contents, 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, osversion, isa_level,
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soname, 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, osversion, isa_level,
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soname, 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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