/* 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
        .ifeq   \call_time
                get_datapage    r5 vdso_u_time_data
        .else
                get_datapage    r4 vdso_u_time_data
        .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
        .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 clock_getres_time64()
 *
 * int __kernel_clock_getres(clockid_t clock_id, struct __timespec64 *res);
 *
 */
#ifndef __powerpc64__
V_FUNCTION_BEGIN(__kernel_clock_getres_time64)
        cvdso_call __c_kernel_clock_getres_time64
V_FUNCTION_END(__kernel_clock_getres_time64)
#endif


/*
 * 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)