/* SPDX-License-Identifier: GPL-2.0-or-later *//* * Userland implementation of getrandom() for processes * for use in the vDSO * * Copyright (C) 2024 Christophe Leroy <christophe.leroy@csgroup.eu>, CS GROUP France */#include <asm/processor.h>#include <asm/ppc_asm.h>#include <asm/vdso.h>#include <asm/vdso_datapage.h>#include <asm/asm-offsets.h>#include <asm/unistd.h> /* * The macro sets two stack frames, one for the caller and one for the callee * because there are no requirement for the caller to set a stack frame when * calling VDSO so it may have omitted to set one, especially on PPC64 */ .macro cvdso_call funct  .cfi_startproc	PPC_STLU	r1, -PPC_MIN_STKFRM(r1)  .cfi_adjust_cfa_offset PPC_MIN_STKFRM	mflr		r0	PPC_STLU	r1, -PPC_MIN_STKFRM(r1)  .cfi_adjust_cfa_offset PPC_MIN_STKFRM	PPC_STL		r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1)  .cfi_rel_offset lr, PPC_MIN_STKFRM + PPC_LR_STKOFF#ifdef __powerpc64__	PPC_STL		r2, PPC_MIN_STKFRM + STK_GOT(r1)  .cfi_rel_offset r2, PPC_MIN_STKFRM + STK_GOT#endif	bl		CFUNC(DOTSYM(\funct))	PPC_LL		r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1)#ifdef __powerpc64__	PPC_LL		r2, PPC_MIN_STKFRM + STK_GOT(r1)  .cfi_restore r2#endif	cmpwi		r3, 0	mtlr		r0	addi		r1, r1, 2 * PPC_MIN_STKFRM  .cfi_restore lr  .cfi_def_cfa_offset 0	crclr		so	bgelr+	crset		so	neg		r3, r3	blr  .cfi_endproc.endm 	.textV_FUNCTION_BEGIN(__kernel_getrandom)	cvdso_call __c_kernel_getrandomV_FUNCTION_END(__kernel_getrandom)