2023-08-30 17:31:07 +02:00
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Userland implementation of gettimeofday() for processes
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* for use in the vDSO
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*
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* Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org,
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* IBM Corp.
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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 call_time=0
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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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get_datapage r5
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.ifeq \call_time
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addi r5, r5, VDSO_DATA_OFFSET
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.else
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addi r4, r5, VDSO_DATA_OFFSET
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.endif
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2023-10-24 12:59:35 +02:00
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#ifdef __powerpc64__
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bl CFUNC(DOTSYM(\funct))
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#else
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bl \funct
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#endif
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2023-08-30 17:31:07 +02:00
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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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.ifeq \call_time
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cmpwi r3, 0
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.endif
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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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.ifeq \call_time
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beqlr+
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crset so
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neg r3, r3
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.endif
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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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/*
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* Exact prototype of gettimeofday
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*
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* int __kernel_gettimeofday(struct timeval *tv, struct timezone *tz);
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*
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*/
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V_FUNCTION_BEGIN(__kernel_gettimeofday)
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cvdso_call __c_kernel_gettimeofday
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V_FUNCTION_END(__kernel_gettimeofday)
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/*
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* Exact prototype of clock_gettime()
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*
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* int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp);
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*
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*/
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V_FUNCTION_BEGIN(__kernel_clock_gettime)
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cvdso_call __c_kernel_clock_gettime
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V_FUNCTION_END(__kernel_clock_gettime)
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/*
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* Exact prototype of clock_gettime64()
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*
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* int __kernel_clock_gettime64(clockid_t clock_id, struct __timespec64 *ts);
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*
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*/
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#ifndef __powerpc64__
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V_FUNCTION_BEGIN(__kernel_clock_gettime64)
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cvdso_call __c_kernel_clock_gettime64
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V_FUNCTION_END(__kernel_clock_gettime64)
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#endif
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/*
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* Exact prototype of clock_getres()
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*
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* int __kernel_clock_getres(clockid_t clock_id, struct timespec *res);
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*
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*/
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V_FUNCTION_BEGIN(__kernel_clock_getres)
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cvdso_call __c_kernel_clock_getres
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V_FUNCTION_END(__kernel_clock_getres)
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/*
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* Exact prototype of time()
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*
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* time_t time(time *t);
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*
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*/
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V_FUNCTION_BEGIN(__kernel_time)
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cvdso_call __c_kernel_time call_time=1
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V_FUNCTION_END(__kernel_time)
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/* Routines for restoring integer registers, called by the compiler. */
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/* Called with r11 pointing to the stack header word of the caller of the */
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/* function, just beyond the end of the integer restore area. */
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#ifndef __powerpc64__
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_GLOBAL(_restgpr_31_x)
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_GLOBAL(_rest32gpr_31_x)
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lwz r0,4(r11)
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lwz r31,-4(r11)
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mtlr r0
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mr r1,r11
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blr
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#endif
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