| /* 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 |
| #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 |
