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7f33b09c | 1 | /* RISC-V instruction cache flushing VDSO calls |
04277e02 | 2 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
7f33b09c PD |
3 | |
4 | This file is part of the GNU C Library. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public License as | |
8 | published by the Free Software Foundation; either version 2.1 of the | |
9 | License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library 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 GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <dl-vdso.h> | |
21 | #include <stdlib.h> | |
22 | #include <atomic.h> | |
23 | #include <sys/cachectl.h> | |
28dd3939 | 24 | #if __has_include (<asm/syscalls.h>) |
0b9c8490 L |
25 | # include <asm/syscalls.h> |
26 | #else | |
27 | # include <asm/unistd.h> | |
28 | #endif | |
7f33b09c PD |
29 | |
30 | typedef int (*func_type) (void *, void *, unsigned long int); | |
31 | ||
32 | static int | |
33 | __riscv_flush_icache_syscall (void *start, void *end, unsigned long int flags) | |
34 | { | |
35 | return INLINE_SYSCALL (riscv_flush_icache, 3, start, end, flags); | |
36 | } | |
37 | ||
38 | static func_type | |
39 | __lookup_riscv_flush_icache (void) | |
40 | { | |
41 | PREPARE_VERSION_KNOWN (linux_version, LINUX_4_15); | |
42 | ||
43 | func_type func = _dl_vdso_vsym ("__vdso_flush_icache", &linux_version); | |
44 | ||
45 | /* If there is no vDSO entry then call the system call directly. All Linux | |
46 | versions provide the vDSO entry, but QEMU's user-mode emulation doesn't | |
47 | provide a vDSO. */ | |
48 | if (!func) | |
49 | func = &__riscv_flush_icache_syscall; | |
50 | ||
51 | return func; | |
52 | } | |
53 | ||
54 | #ifdef SHARED | |
55 | ||
56 | # define INIT_ARCH() | |
57 | libc_ifunc (__riscv_flush_icache, __lookup_riscv_flush_icache ()) | |
58 | ||
59 | #else | |
60 | ||
61 | int | |
62 | __riscv_flush_icache (void *start, void *end, unsigned long int flags) | |
63 | { | |
64 | static volatile func_type cached_func; | |
65 | ||
66 | func_type func = atomic_load_relaxed (&cached_func); | |
67 | ||
68 | if (!func) | |
69 | { | |
70 | func = __lookup_riscv_flush_icache (); | |
71 | atomic_store_relaxed (&cached_func, func); | |
72 | } | |
73 | ||
74 | return func (start, end, flags); | |
75 | } | |
76 | ||
77 | #endif |