130 lines
3.0 KiB
ArmAsm
130 lines
3.0 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Userland implementation of gettimeofday() for processes
|
|
* for use in the vDSO
|
|
*
|
|
* Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org,
|
|
* 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
|
|
bl 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
|
|
.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
|