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