1*c0087d80SHeiko Carstens/* SPDX-License-Identifier: GPL-2.0 */ 2*c0087d80SHeiko Carstens#include <linux/linkage.h> 3*c0087d80SHeiko Carstens#include <asm/vdso.h> 4*c0087d80SHeiko Carstens#include <asm/unistd.h> 5*c0087d80SHeiko Carstens#include <asm/asm-offsets.h> 6*c0087d80SHeiko Carstens#include <asm/dwarf.h> 7*c0087d80SHeiko Carstens#include <asm/ptrace.h> 8*c0087d80SHeiko Carstens 9*c0087d80SHeiko Carstens/* 10*c0087d80SHeiko Carstens * Older glibc version called vdso without allocating a stackframe. This wrapper 11*c0087d80SHeiko Carstens * is just used to allocate a stackframe. See 12*c0087d80SHeiko Carstens * https://sourceware.org/git/?p=glibc.git;a=commit;h=478593e6374f3818da39332260dc453cb19cfa1e 13*c0087d80SHeiko Carstens * for details. 14*c0087d80SHeiko Carstens */ 15*c0087d80SHeiko Carstens.macro vdso_func func 16*c0087d80SHeiko CarstensSYM_FUNC_START(__kernel_\func) 17*c0087d80SHeiko Carstens CFI_STARTPROC 18*c0087d80SHeiko Carstens aghi %r15,-STACK_FRAME_VDSO_OVERHEAD 19*c0087d80SHeiko Carstens CFI_DEF_CFA_OFFSET (STACK_FRAME_USER_OVERHEAD + STACK_FRAME_VDSO_OVERHEAD) 20*c0087d80SHeiko Carstens CFI_VAL_OFFSET 15,-STACK_FRAME_USER_OVERHEAD 21*c0087d80SHeiko Carstens stg %r14,__SFVDSO_RETURN_ADDRESS(%r15) 22*c0087d80SHeiko Carstens CFI_REL_OFFSET 14,__SFVDSO_RETURN_ADDRESS 23*c0087d80SHeiko Carstens xc __SFUSER_BACKCHAIN(8,%r15),__SFUSER_BACKCHAIN(%r15) 24*c0087d80SHeiko Carstens brasl %r14,__s390_vdso_\func 25*c0087d80SHeiko Carstens lg %r14,__SFVDSO_RETURN_ADDRESS(%r15) 26*c0087d80SHeiko Carstens CFI_RESTORE 14 27*c0087d80SHeiko Carstens aghi %r15,STACK_FRAME_VDSO_OVERHEAD 28*c0087d80SHeiko Carstens CFI_DEF_CFA_OFFSET STACK_FRAME_USER_OVERHEAD 29*c0087d80SHeiko Carstens CFI_RESTORE 15 30*c0087d80SHeiko Carstens br %r14 31*c0087d80SHeiko Carstens CFI_ENDPROC 32*c0087d80SHeiko CarstensSYM_FUNC_END(__kernel_\func) 33*c0087d80SHeiko Carstens.endm 34*c0087d80SHeiko Carstens 35*c0087d80SHeiko Carstensvdso_func gettimeofday 36*c0087d80SHeiko Carstensvdso_func clock_getres 37*c0087d80SHeiko Carstensvdso_func clock_gettime 38*c0087d80SHeiko Carstensvdso_func getcpu 39*c0087d80SHeiko Carstens 40*c0087d80SHeiko Carstens.macro vdso_syscall func,syscall 41*c0087d80SHeiko CarstensSYM_FUNC_START(__kernel_\func) 42*c0087d80SHeiko Carstens CFI_STARTPROC 43*c0087d80SHeiko Carstens svc \syscall 44*c0087d80SHeiko Carstens /* Make sure we notice when a syscall returns, which shouldn't happen */ 45*c0087d80SHeiko Carstens .word 0 46*c0087d80SHeiko Carstens CFI_ENDPROC 47*c0087d80SHeiko CarstensSYM_FUNC_END(__kernel_\func) 48*c0087d80SHeiko Carstens.endm 49*c0087d80SHeiko Carstens 50*c0087d80SHeiko Carstensvdso_syscall restart_syscall,__NR_restart_syscall 51*c0087d80SHeiko Carstensvdso_syscall sigreturn,__NR_sigreturn 52*c0087d80SHeiko Carstensvdso_syscall rt_sigreturn,__NR_rt_sigreturn 53