/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Userland implementation of gettimeofday() for processes
* for use in the vDSO
*
* Copyright (C) 2004 Benjamin Herrenschmuidt ([email protected],
* IBM Corp.
*/
#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 call_time=0
.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
get_datapage r5
.ifeq \call_time
addi r5, r5, VDSO_DATA_OFFSET
.else
addi r4, r5, VDSO_DATA_OFFSET
.endif
#ifdef __powerpc64__
bl CFUNC(DOTSYM(\funct))
#else
bl \funct
#endif
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
.ifeq \call_time
cmpwi r3, 0
.endif
mtlr r0
addi r1, r1, 2 * PPC_MIN_STKFRM
.cfi_restore lr
.cfi_def_cfa_offset 0
crclr so
.ifeq \call_time
beqlr+
crset so
neg r3, r3
.endif
blr
.cfi_endproc
.endm
.text
/*
* Exact prototype of gettimeofday
*
* int __kernel_gettimeofday(struct timeval *tv, struct timezone *tz);
*
*/
V_FUNCTION_BEGIN(__kernel_gettimeofday)
cvdso_call __c_kernel_gettimeofday
V_FUNCTION_END(__kernel_gettimeofday)
/*
* Exact prototype of clock_gettime()
*
* int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp);
*
*/
V_FUNCTION_BEGIN(__kernel_clock_gettime)
cvdso_call __c_kernel_clock_gettime
V_FUNCTION_END(__kernel_clock_gettime)
/*
* Exact prototype of clock_gettime64()
*
* int __kernel_clock_gettime64(clockid_t clock_id, struct __timespec64 *ts);
*
*/
#ifndef __powerpc64__
V_FUNCTION_BEGIN(__kernel_clock_gettime64)
cvdso_call __c_kernel_clock_gettime64
V_FUNCTION_END(__kernel_clock_gettime64)
#endif
/*
* Exact prototype of clock_getres()
*
* int __kernel_clock_getres(clockid_t clock_id, struct timespec *res);
*
*/
V_FUNCTION_BEGIN(__kernel_clock_getres)
cvdso_call __c_kernel_clock_getres
V_FUNCTION_END(__kernel_clock_getres)
/*
* Exact prototype of time()
*
* time_t time(time *t);
*
*/
V_FUNCTION_BEGIN(__kernel_time)
cvdso_call __c_kernel_time call_time=1
V_FUNCTION_END(__kernel_time)
/* Routines for restoring integer registers, called by the compiler. */
/* Called with r11 pointing to the stack header word of the caller of the */
/* function, just beyond the end of the integer restore area. */
#ifndef __powerpc64__
_GLOBAL(_restgpr_31_x)
_GLOBAL(_rest32gpr_31_x)
lwz r0,4(r11)
lwz r31,-4(r11)
mtlr r0
mr r1,r11
blr
#endif
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