vdso_user_wrapper.S (1480B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#include <asm/vdso.h> 3#include <asm/unistd.h> 4#include <asm/asm-offsets.h> 5#include <asm/dwarf.h> 6#include <asm/ptrace.h> 7 8#define WRAPPER_FRAME_SIZE (STACK_FRAME_OVERHEAD+8) 9 10/* 11 * Older glibc version called vdso without allocating a stackframe. This wrapper 12 * is just used to allocate a stackframe. See 13 * https://sourceware.org/git/?p=glibc.git;a=commit;h=478593e6374f3818da39332260dc453cb19cfa1e 14 * for details. 15 */ 16.macro vdso_func func 17 .globl __kernel_\func 18 .type __kernel_\func,@function 19 .align 8 20__kernel_\func: 21 CFI_STARTPROC 22 aghi %r15,-WRAPPER_FRAME_SIZE 23 CFI_DEF_CFA_OFFSET (STACK_FRAME_OVERHEAD + WRAPPER_FRAME_SIZE) 24 CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD 25 stg %r14,STACK_FRAME_OVERHEAD(%r15) 26 brasl %r14,__s390_vdso_\func 27 lg %r14,STACK_FRAME_OVERHEAD(%r15) 28 aghi %r15,WRAPPER_FRAME_SIZE 29 CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD 30 CFI_RESTORE 15 31 br %r14 32 CFI_ENDPROC 33 .size __kernel_\func,.-__kernel_\func 34.endm 35 36vdso_func gettimeofday 37vdso_func clock_getres 38vdso_func clock_gettime 39vdso_func getcpu 40 41.macro vdso_syscall func,syscall 42 .globl __kernel_\func 43 .type __kernel_\func,@function 44 .align 8 45__kernel_\func: 46 CFI_STARTPROC 47 svc \syscall 48 /* Make sure we notice when a syscall returns, which shouldn't happen */ 49 .word 0 50 CFI_ENDPROC 51 .size __kernel_\func,.-__kernel_\func 52.endm 53 54vdso_syscall restart_syscall,__NR_restart_syscall 55vdso_syscall sigreturn,__NR_sigreturn 56vdso_syscall rt_sigreturn,__NR_rt_sigreturn