1/* SPDX-License-Identifier: GPL-2.0 */
 2#include <linux/linkage.h>
 3#include <asm/vdso.h>
 4#include <asm/unistd.h>
 5#include <asm/asm-offsets.h>
 6#include <asm/dwarf.h>
 7#include <asm/ptrace.h>
 8
 9#define WRAPPER_FRAME_SIZE (STACK_FRAME_OVERHEAD+8)
10
11/*
12 * Older glibc version called vdso without allocating a stackframe. This wrapper
13 * is just used to allocate a stackframe. See
14 * https://sourceware.org/git/?p=glibc.git;a=commit;h=478593e6374f3818da39332260dc453cb19cfa1e
15 * for details.
16 */
17.macro vdso_func func
18	.globl __kernel_\func
19	.type  __kernel_\func,@function
20	__ALIGN
21__kernel_\func:
22	CFI_STARTPROC
23	aghi	%r15,-WRAPPER_FRAME_SIZE
24	CFI_DEF_CFA_OFFSET (STACK_FRAME_OVERHEAD + WRAPPER_FRAME_SIZE)
25	CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
26	stg	%r14,STACK_FRAME_OVERHEAD(%r15)
 
 
27	brasl	%r14,__s390_vdso_\func
28	lg	%r14,STACK_FRAME_OVERHEAD(%r15)
29	aghi	%r15,WRAPPER_FRAME_SIZE
30	CFI_DEF_CFA_OFFSET STACK_FRAME_OVERHEAD
 
31	CFI_RESTORE 15
32	br	%r14
33	CFI_ENDPROC
34	.size	__kernel_\func,.-__kernel_\func
35.endm
36
37vdso_func gettimeofday
38vdso_func clock_getres
39vdso_func clock_gettime
40vdso_func getcpu
41
42.macro vdso_syscall func,syscall
43	.globl __kernel_\func
44	.type  __kernel_\func,@function
45	__ALIGN
46__kernel_\func:
47	CFI_STARTPROC
48	svc	\syscall
49	/* Make sure we notice when a syscall returns, which shouldn't happen */
50	.word	0
51	CFI_ENDPROC
52	.size	__kernel_\func,.-__kernel_\func
53.endm
54
55vdso_syscall restart_syscall,__NR_restart_syscall
56vdso_syscall sigreturn,__NR_sigreturn
57vdso_syscall rt_sigreturn,__NR_rt_sigreturn

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