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While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembler code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This is bad since macros starting with two underscores are names that are reserved by the C language. It can also be very confusing for the developers when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize now on the __ASSEMBLER__ macro that is provided by the compilers. This is almost a completely mechanical patch (done with a simple "sed -i" statement), apart from tweaking two comments manually in arch/powerpc/include/asm/bug.h and arch/powerpc/include/asm/kasan.h (which did not have proper underscores at the end) and fixing a checkpatch error about spaces in arch/powerpc/include/asm/spu_csa.h. Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20250801082007.32904-3-thuth@redhat.com
68 lines
1.8 KiB
C
68 lines
1.8 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 __ASSEMBLER__
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#include <asm/vdso_datapage.h>
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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 const struct vdso_rng_data *__arch_get_vdso_u_rng_data(void)
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{
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struct vdso_rng_data *data;
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asm (
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" bcl 20, 31, .+4 ;"
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"0: mflr %0 ;"
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" addis %0, %0, (vdso_u_rng_data - 0b)@ha ;"
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" addi %0, %0, (vdso_u_rng_data - 0b)@l ;"
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: "=r" (data) : : "lr"
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);
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return data;
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}
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#define __arch_get_vdso_u_rng_data __arch_get_vdso_u_rng_data
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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);
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#endif /* !__ASSEMBLER__ */
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#endif /* _ASM_POWERPC_VDSO_GETRANDOM_H */
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