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7f33b09c | 1 | /* Support for reading ELF files. |
dff8da6b | 2 | Copyright (C) 1999-2024 Free Software Foundation, Inc. |
7f33b09c PD |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
7f33b09c PD |
18 | |
19 | ||
efbbd9c3 | 20 | int process_elf32_file (const char *file_name, const char *lib, |
c628c229 | 21 | int *flag, unsigned int *isa_level, char **soname, |
7f33b09c | 22 | void *file_contents, size_t file_length); |
efbbd9c3 | 23 | int process_elf64_file (const char *file_name, const char *lib, |
c628c229 | 24 | int *flag, unsigned int *isa_level, char **soname, |
7f33b09c PD |
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, | |
c628c229 AZ |
41 | unsigned int *isa_level, char **soname, void *file_contents, |
42 | size_t file_length) | |
7f33b09c PD |
43 | { |
44 | ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents; | |
45 | Elf32_Ehdr *elf32_header = (Elf32_Ehdr *) elf_header; | |
6a1ff640 | 46 | Elf64_Ehdr *elf64_header = (Elf64_Ehdr *) elf_header; |
7f33b09c PD |
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 | { | |
c628c229 AZ |
55 | ret = process_elf32_file (file_name, lib, flag, isa_level, soname, |
56 | file_contents, file_length); | |
7f33b09c PD |
57 | flags = elf32_header->e_flags; |
58 | } | |
59 | else | |
60 | { | |
c628c229 AZ |
61 | ret = process_elf64_file (file_name, lib, flag, isa_level, soname, |
62 | file_contents, file_length); | |
6a1ff640 | 63 | flags = elf64_header->e_flags; |
7f33b09c PD |
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" |