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/* Support for reading ELF files.
Copyright (C) 1999-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
int process_elf32_file (const char *file_name, const char *lib, int *flag,
unsigned int *osversion, char **soname,
void *file_contents, size_t file_length);
int process_elf64_file (const char *file_name, const char *lib, int *flag,
unsigned int *osversion, char **soname,
void *file_contents, size_t file_length);
/* The ELF flags supported by our current glibc port:
- EF_RISCV_FLOAT_ABI: We support the soft and double ABIs.
- EF_RISCV_RVC: While the Linux ABI mandates the presence of the C
extension, we can still support libraries compiled without that extension
so we just ignore this flag.
- EF_RISCV_RVE: glibc (and Linux) don't support RV32E based systems.
- EF_RISCV_TSO: The TSO extension isn't supported, as doing so would require
some mechanism to ensure that the TSO extension is enabled which doesn't
currently exist. */
#define SUPPORTED_ELF_FLAGS (EF_RISCV_FLOAT_ABI | EF_RISCV_RVC)
/* Returns 0 if everything is ok, != 0 in case of error. */
int
process_elf_file (const char *file_name, const char *lib, int *flag,
unsigned int *osversion, char **soname, void *file_contents,
size_t file_length)
{
ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents;
Elf32_Ehdr *elf32_header = (Elf32_Ehdr *) elf_header;
Elf64_Ehdr *elf64_header = (Elf64_Ehdr *) elf_header;
int ret;
long flags;
/* RISC-V libraries are always libc.so.6+. */
*flag = FLAG_ELF_LIBC6;
if (elf_header->e_ident [EI_CLASS] == ELFCLASS32)
{
ret = process_elf32_file (file_name, lib, flag, osversion, soname,
file_contents, file_length);
flags = elf32_header->e_flags;
}
else
{
ret = process_elf64_file (file_name, lib, flag, osversion, soname,
file_contents, file_length);
flags = elf64_header->e_flags;
}
/* RISC-V linkers encode the floating point ABI as part of the ELF headers. */
switch (flags & EF_RISCV_FLOAT_ABI)
{
case EF_RISCV_FLOAT_ABI_SOFT:
*flag |= FLAG_RISCV_FLOAT_ABI_SOFT;
break;
case EF_RISCV_FLOAT_ABI_DOUBLE:
*flag |= FLAG_RISCV_FLOAT_ABI_DOUBLE;
break;
default:
return 1;
}
/* If there are any other ELF flags set then glibc doesn't support this
library. */
if (flags & ~SUPPORTED_ELF_FLAGS)
return 1;
return ret;
}
#undef __ELF_NATIVE_CLASS
#undef process_elf_file
#define process_elf_file process_elf32_file
#define __ELF_NATIVE_CLASS 32
#include "elf/readelflib.c"
#undef __ELF_NATIVE_CLASS
#undef process_elf_file
#define process_elf_file process_elf64_file
#define __ELF_NATIVE_CLASS 64
#include "elf/readelflib.c"
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