fusl/arch/i386/syscall_arch.h

#define __SYSCALL_LL_E(x) \
  ((union {               \
    long long ll;         \
    long l[2];            \
  }){.ll = x})            \
      .l[0],              \
      ((union {           \
        long long ll;     \
        long l[2];        \
      }){.ll = x})        \
          .l[1]
#define __SYSCALL_LL_O(x) __SYSCALL_LL_E((x))

static inline long __syscall0(long n) {
  unsigned long __ret;
  __asm__ __volatile__(".hidden __vsyscall ; call __vsyscall"
                       : "=a"(__ret)
                       : "a"(n)
                       : "memory");
  return __ret;
}

static inline long __syscall1(long n, long a1) {
  unsigned long __ret;
  __asm__ __volatile__(".hidden __vsyscall ; call __vsyscall"
                       : "=a"(__ret)
                       : "a"(n), "d"(a1)
                       : "memory");
  return __ret;
}

static inline long __syscall2(long n, long a1, long a2) {
  unsigned long __ret;
  __asm__ __volatile__(".hidden __vsyscall ; call __vsyscall"
                       : "=a"(__ret)
                       : "a"(n), "d"(a1), "c"(a2)
                       : "memory");
  return __ret;
}

static inline long __syscall3(long n, long a1, long a2, long a3) {
  unsigned long __ret;
  __asm__ __volatile__(".hidden __vsyscall ; call __vsyscall"
                       : "=a"(__ret)
                       : "a"(n), "d"(a1), "c"(a2), "D"(a3)
                       : "memory");
  return __ret;
}

static inline long __syscall4(long n, long a1, long a2, long a3, long a4) {
  unsigned long __ret;
  __asm__ __volatile__(".hidden __vsyscall ; call __vsyscall"
                       : "=a"(__ret)
                       : "a"(n), "d"(a1), "c"(a2), "D"(a3), "S"(a4)
                       : "memory");
  return __ret;
}

static inline long __syscall5(long n,
                              long a1,
                              long a2,
                              long a3,
                              long a4,
                              long a5) {
  unsigned long __ret;
  __asm__ __volatile__(
      "push %6 ; .hidden __vsyscall ; call __vsyscall ; add $4,%%esp"
      : "=a"(__ret)
      : "a"(n), "d"(a1), "c"(a2), "D"(a3), "S"(a4), "g"(a5)
      : "memory");
  return __ret;
}

static inline long
__syscall6(long n, long a1, long a2, long a3, long a4, long a5, long a6) {
  unsigned long __ret;
  __asm__ __volatile__(
      "push %6 ; .hidden __vsyscall6 ; call __vsyscall6 ; add $4,%%esp"
      : "=a"(__ret)
      : "a"(n), "d"(a1), "c"(a2), "D"(a3), "S"(a4), "g"(0 + (long[]){a5, a6})
      : "memory");
  return __ret;
}

#define VDSO_USEFUL
#define VDSO_CGT_SYM "__vdso_clock_gettime"
#define VDSO_CGT_VER "LINUX_2.6"

#define SYSCALL_USE_SOCKETCALL