1 | /* Support for reading ELF files. |
2 | Copyright (C) 1999-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | |
20 | int process_elf32_file (const char *file_name, const char *lib, |
21 | int *flag, unsigned int *isa_level, char **soname, |
22 | void *file_contents, size_t file_length); |
23 | int process_elf64_file (const char *file_name, const char *lib, |
24 | int *flag, unsigned int *isa_level, char **soname, |
25 | void *file_contents, size_t file_length); |
26 | |
27 | /* The ELF flags supported by our current glibc port: |
28 | - EF_RISCV_FLOAT_ABI: We support the soft and double ABIs. |
29 | - EF_RISCV_RVC: While the Linux ABI mandates the presence of the C |
30 | extension, we can still support libraries compiled without that extension |
31 | so we just ignore this flag. |
32 | - EF_RISCV_RVE: glibc (and Linux) don't support RV32E based systems. |
33 | - EF_RISCV_TSO: The TSO extension isn't supported, as doing so would require |
34 | some mechanism to ensure that the TSO extension is enabled which doesn't |
35 | currently exist. */ |
36 | #define SUPPORTED_ELF_FLAGS (EF_RISCV_FLOAT_ABI | EF_RISCV_RVC) |
37 | |
38 | /* Returns 0 if everything is ok, != 0 in case of error. */ |
39 | int |
40 | process_elf_file (const char *file_name, const char *lib, int *flag, |
41 | unsigned int *isa_level, char **soname, void *file_contents, |
42 | size_t file_length) |
43 | { |
44 | ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents; |
45 | Elf32_Ehdr *elf32_header = (Elf32_Ehdr *) elf_header; |
46 | Elf64_Ehdr *elf64_header = (Elf64_Ehdr *) elf_header; |
47 | int ret; |
48 | long flags; |
49 | |
50 | /* RISC-V libraries are always libc.so.6+. */ |
51 | *flag = FLAG_ELF_LIBC6; |
52 | |
53 | if (elf_header->e_ident [EI_CLASS] == ELFCLASS32) |
54 | { |
55 | ret = process_elf32_file (file_name, lib, flag, isa_level, soname, |
56 | file_contents, file_length); |
57 | flags = elf32_header->e_flags; |
58 | } |
59 | else |
60 | { |
61 | ret = process_elf64_file (file_name, lib, flag, isa_level, soname, |
62 | file_contents, file_length); |
63 | flags = elf64_header->e_flags; |
64 | } |
65 | |
66 | /* RISC-V linkers encode the floating point ABI as part of the ELF headers. */ |
67 | switch (flags & EF_RISCV_FLOAT_ABI) |
68 | { |
69 | case EF_RISCV_FLOAT_ABI_SOFT: |
70 | *flag |= FLAG_RISCV_FLOAT_ABI_SOFT; |
71 | break; |
72 | case EF_RISCV_FLOAT_ABI_DOUBLE: |
73 | *flag |= FLAG_RISCV_FLOAT_ABI_DOUBLE; |
74 | break; |
75 | default: |
76 | return 1; |
77 | } |
78 | |
79 | /* If there are any other ELF flags set then glibc doesn't support this |
80 | library. */ |
81 | if (flags & ~SUPPORTED_ELF_FLAGS) |
82 | return 1; |
83 | |
84 | return ret; |
85 | } |
86 | |
87 | #undef __ELF_NATIVE_CLASS |
88 | #undef process_elf_file |
89 | #define process_elf_file process_elf32_file |
90 | #define __ELF_NATIVE_CLASS 32 |
91 | #include "elf/readelflib.c" |
92 | |
93 | #undef __ELF_NATIVE_CLASS |
94 | #undef process_elf_file |
95 | #define process_elf_file process_elf64_file |
96 | #define __ELF_NATIVE_CLASS 64 |
97 | #include "elf/readelflib.c" |
98 | |