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f6480e70 MR |
1 | /* GNU/Linux/RISC-V native target description support for GDB. |
2 | Copyright (C) 2020 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include "gdbsupport/common-defs.h" | |
20 | ||
21 | #include "gdb_proc_service.h" | |
22 | #include "arch/riscv.h" | |
23 | #include "elf/common.h" | |
24 | #include "nat/gdb_ptrace.h" | |
25 | #include "nat/riscv-linux-tdesc.h" | |
26 | ||
27 | #include <sys/uio.h> | |
28 | ||
29 | /* Work around glibc header breakage causing ELF_NFPREG not to be usable. */ | |
30 | #ifndef NFPREG | |
31 | # define NFPREG 33 | |
32 | #endif | |
33 | ||
d1c9b20f | 34 | /* See nat/riscv-linux-tdesc.h. */ |
f6480e70 | 35 | |
d1c9b20f AB |
36 | struct riscv_gdbarch_features |
37 | riscv_linux_read_features (int tid) | |
f6480e70 MR |
38 | { |
39 | struct riscv_gdbarch_features features; | |
40 | elf_fpregset_t regs; | |
41 | int flen; | |
42 | ||
43 | /* Figuring out xlen is easy. */ | |
44 | features.xlen = sizeof (elf_greg_t); | |
45 | ||
46 | /* Start with no f-registers. */ | |
47 | features.flen = 0; | |
48 | ||
49 | /* How much worth of f-registers can we fetch if any? */ | |
50 | for (flen = sizeof (regs.__f.__f[0]); ; flen *= 2) | |
51 | { | |
52 | size_t regset_size; | |
53 | struct iovec iov; | |
54 | ||
55 | /* Regsets have a uniform slot size, so we count FSCR like | |
56 | an FP data register. */ | |
57 | regset_size = ELF_NFPREG * flen; | |
58 | if (regset_size > sizeof (regs)) | |
59 | break; | |
60 | ||
61 | iov.iov_base = ®s; | |
62 | iov.iov_len = regset_size; | |
63 | if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, | |
64 | (PTRACE_TYPE_ARG3) &iov) == -1) | |
65 | { | |
66 | switch (errno) | |
67 | { | |
68 | case EINVAL: | |
69 | continue; | |
70 | case EIO: | |
71 | break; | |
72 | default: | |
73 | perror_with_name (_("Couldn't get registers")); | |
74 | break; | |
75 | } | |
76 | } | |
77 | else | |
78 | features.flen = flen; | |
79 | break; | |
80 | } | |
81 | ||
d1c9b20f | 82 | return features; |
f6480e70 | 83 | } |