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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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38 lines
1009 B
C
38 lines
1009 B
C
#ifndef LKMC_FUTEX_H
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#define LKMC_FUTEX_H
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <linux/futex.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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static int
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lkmc_futex(int *uaddr, int futex_op, int val,
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const struct timespec *timeout, int *uaddr2, int val3)
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{
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#if defined(__aarch64__)
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register uint64_t x0 __asm__ ("x0") = (uint64_t)uaddr;
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register uint64_t x1 __asm__ ("x1") = futex_op;
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register uint64_t x2 __asm__ ("x2") = val;
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register const struct timespec *x3 __asm__ ("x3") = timeout;
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register int *x4 __asm__ ("x4") = uaddr2;
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register uint64_t x5 __asm__ ("x5") = val3;
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register uint64_t x8 __asm__ ("x8") = SYS_futex; /* syscall number */
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__asm__ __volatile__ (
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"svc 0;"
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: "+r" (x0)
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: "r" (x1), "r" (x2), "r" (x3), "r" (x4), "r" (x5), "r" (x8)
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: "memory"
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);
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return x0;
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#else
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(void)uaddr2;
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return syscall(SYS_futex, uaddr, futex_op, val,
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timeout, uaddr, val3);
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#endif
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}
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#endif
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