Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
57 lines
1.4 KiB
ArmAsm
57 lines
1.4 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Userland implementation of getrandom() for processes
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* for use in the vDSO
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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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#include <asm/processor.h>
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#include <asm/ppc_asm.h>
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#include <asm/vdso.h>
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#include <asm/vdso_datapage.h>
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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/*
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* The macro sets two stack frames, one for the caller and one for the callee
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* because there are no requirement for the caller to set a stack frame when
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* calling VDSO so it may have omitted to set one, especially on PPC64
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*/
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.macro cvdso_call funct
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.cfi_startproc
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PPC_STLU r1, -PPC_MIN_STKFRM(r1)
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.cfi_adjust_cfa_offset PPC_MIN_STKFRM
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mflr r0
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PPC_STLU r1, -PPC_MIN_STKFRM(r1)
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.cfi_adjust_cfa_offset PPC_MIN_STKFRM
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PPC_STL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1)
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.cfi_rel_offset lr, PPC_MIN_STKFRM + PPC_LR_STKOFF
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#ifdef __powerpc64__
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PPC_STL r2, PPC_MIN_STKFRM + STK_GOT(r1)
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.cfi_rel_offset r2, PPC_MIN_STKFRM + STK_GOT
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#endif
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bl CFUNC(DOTSYM(\funct))
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PPC_LL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1)
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#ifdef __powerpc64__
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PPC_LL r2, PPC_MIN_STKFRM + STK_GOT(r1)
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.cfi_restore r2
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#endif
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cmpwi r3, 0
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mtlr r0
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addi r1, r1, 2 * PPC_MIN_STKFRM
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.cfi_restore lr
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.cfi_def_cfa_offset 0
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crclr so
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bgelr+
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crset so
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neg r3, r3
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blr
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.cfi_endproc
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.endm
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.text
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V_FUNCTION_BEGIN(__kernel_getrandom)
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cvdso_call __c_kernel_getrandom
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V_FUNCTION_END(__kernel_getrandom)
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