54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2024 Christophe Leroy <christophe.leroy@csgroup.eu>, CS GROUP France
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*/
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#ifndef _ASM_POWERPC_VDSO_GETRANDOM_H
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#define _ASM_POWERPC_VDSO_GETRANDOM_H
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#ifndef __ASSEMBLY__
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static __always_inline int do_syscall_3(const unsigned long _r0, const unsigned long _r3,
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const unsigned long _r4, const unsigned long _r5)
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{
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register long r0 asm("r0") = _r0;
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register unsigned long r3 asm("r3") = _r3;
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register unsigned long r4 asm("r4") = _r4;
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register unsigned long r5 asm("r5") = _r5;
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register int ret asm ("r3");
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asm volatile(
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" sc\n"
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" bns+ 1f\n"
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" neg %0, %0\n"
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"1:\n"
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: "=r" (ret), "+r" (r4), "+r" (r5), "+r" (r0)
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: "r" (r3)
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: "memory", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "cr0", "ctr");
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return ret;
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}
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/**
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* getrandom_syscall - Invoke the getrandom() syscall.
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* @buffer: Destination buffer to fill with random bytes.
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* @len: Size of @buffer in bytes.
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* @flags: Zero or more GRND_* flags.
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* Returns: The number of bytes written to @buffer, or a negative value indicating an error.
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*/
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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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return do_syscall_3(__NR_getrandom, (unsigned long)buffer,
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(unsigned long)len, (unsigned long)flags);
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}
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static __always_inline struct vdso_rng_data *__arch_get_vdso_rng_data(void)
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{
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return NULL;
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}
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ssize_t __c_kernel_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state,
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size_t opaque_len, const struct vdso_rng_data *vd);
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_POWERPC_VDSO_GETRANDOM_H */
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