62 lines
1.3 KiB
ArmAsm
62 lines
1.3 KiB
ArmAsm
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/*
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* s390x linux replacement vdso.
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*
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* Copyright 2023 Linaro, Ltd.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include <asm/unistd.h>
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#include "vdso-asmoffset.h"
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.macro endf name
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.globl \name
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.type \name, @function
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.size \name, . - \name
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.endm
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.macro raw_syscall n
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.ifne \n < 0x100
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svc \n
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.else
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lghi %r1, \n
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svc 0
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.endif
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.endm
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.macro vdso_syscall name, nr
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\name:
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.cfi_startproc
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aghi %r15, -(STACK_FRAME_OVERHEAD + 16)
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.cfi_adjust_cfa_offset STACK_FRAME_OVERHEAD + 16
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stg %r14, STACK_FRAME_OVERHEAD(%r15)
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.cfi_rel_offset %r14, STACK_FRAME_OVERHEAD
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raw_syscall \nr
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lg %r14, STACK_FRAME_OVERHEAD(%r15)
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aghi %r15, STACK_FRAME_OVERHEAD + 16
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.cfi_restore %r14
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.cfi_adjust_cfa_offset -(STACK_FRAME_OVERHEAD + 16)
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br %r14
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.cfi_endproc
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endf \name
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.endm
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vdso_syscall __kernel_gettimeofday, __NR_gettimeofday
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vdso_syscall __kernel_clock_gettime, __NR_clock_gettime
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vdso_syscall __kernel_clock_getres, __NR_clock_getres
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vdso_syscall __kernel_getcpu, __NR_getcpu
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/*
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* TODO unwind info, though we're ok without it.
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* The kernel supplies bogus empty unwind info, and it is likely ignored
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* by all users. Without it we get the fallback signal frame handling.
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*/
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__kernel_sigreturn:
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raw_syscall __NR_sigreturn
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endf __kernel_sigreturn
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__kernel_rt_sigreturn:
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raw_syscall __NR_rt_sigreturn
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endf __kernel_rt_sigreturn
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