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- /* SPDX-License-Identifier: GPL-2.0 */
- #include <linux/linkage.h>
- #include <asm/vdso.h>
- #include <asm/unistd.h>
- #include <asm/asm-offsets.h>
- #include <asm/dwarf.h>
- #include <asm/ptrace.h>
- /*
- * Older glibc version called vdso without allocating a stackframe. This wrapper
- * is just used to allocate a stackframe. See
- * https://sourceware.org/git/?p=glibc.git;a=commit;h=478593e6374f3818da39332260dc453cb19cfa1e
- * for details.
- */
- .macro vdso_func func
- SYM_FUNC_START(__kernel_\func)
- CFI_STARTPROC
- aghi %r15,-STACK_FRAME_VDSO_OVERHEAD
- CFI_DEF_CFA_OFFSET (STACK_FRAME_USER_OVERHEAD + STACK_FRAME_VDSO_OVERHEAD)
- CFI_VAL_OFFSET 15,-STACK_FRAME_USER_OVERHEAD
- stg %r14,__SFVDSO_RETURN_ADDRESS(%r15)
- CFI_REL_OFFSET 14,__SFVDSO_RETURN_ADDRESS
- xc __SFUSER_BACKCHAIN(8,%r15),__SFUSER_BACKCHAIN(%r15)
- brasl %r14,__s390_vdso_\func
- lg %r14,__SFVDSO_RETURN_ADDRESS(%r15)
- CFI_RESTORE 14
- aghi %r15,STACK_FRAME_VDSO_OVERHEAD
- CFI_DEF_CFA_OFFSET STACK_FRAME_USER_OVERHEAD
- CFI_RESTORE 15
- br %r14
- CFI_ENDPROC
- SYM_FUNC_END(__kernel_\func)
- .endm
- vdso_func gettimeofday
- vdso_func clock_getres
- vdso_func clock_gettime
- vdso_func getcpu
- .macro vdso_syscall func,syscall
- SYM_FUNC_START(__kernel_\func)
- CFI_STARTPROC
- svc \syscall
- /* Make sure we notice when a syscall returns, which shouldn't happen */
- .word 0
- CFI_ENDPROC
- SYM_FUNC_END(__kernel_\func)
- .endm
- vdso_syscall restart_syscall,__NR_restart_syscall
- vdso_syscall sigreturn,__NR_sigreturn
- vdso_syscall rt_sigreturn,__NR_rt_sigreturn
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