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18efd0b10e
Hook up the generic vDSO implementation to the LoongArch vDSO data page by providing the required __arch_chacha20_blocks_nostack, __arch_get_k_vdso_rng_data, and getrandom_syscall implementations. Also wire up the selftests. Signed-off-by: Xi Ruoyao <xry111@xry111.site> Acked-by: Huacai Chen <chenhuacai@kernel.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
40 lines
1.0 KiB
C
40 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2024 Xi Ruoyao <xry111@xry111.site>. All Rights Reserved.
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*/
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#ifndef __ASM_VDSO_GETRANDOM_H
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#define __ASM_VDSO_GETRANDOM_H
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#ifndef __ASSEMBLY__
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#include <asm/unistd.h>
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#include <asm/vdso/vdso.h>
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static __always_inline ssize_t getrandom_syscall(void *_buffer, size_t _len, unsigned int _flags)
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{
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register long ret asm("a0");
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register long nr asm("a7") = __NR_getrandom;
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register void *buffer asm("a0") = _buffer;
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register size_t len asm("a1") = _len;
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register unsigned int flags asm("a2") = _flags;
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asm volatile(
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" syscall 0\n"
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: "+r" (ret)
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: "r" (nr), "r" (buffer), "r" (len), "r" (flags)
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: "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8",
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"memory");
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return ret;
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}
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static __always_inline const struct vdso_rng_data *__arch_get_vdso_rng_data(void)
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{
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return (const struct vdso_rng_data *)(get_vdso_data() + VVAR_LOONGARCH_PAGES_START *
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PAGE_SIZE + offsetof(struct loongarch_vdso_data, rng_data));
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_VDSO_GETRANDOM_H */
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