#include <stdint.h>

uint64_t syscall(uint64_t num, uint64_t arg1, uint64_t arg2,
    uint64_t arg3, uint64_t arg4, uint64_t arg5, uint64_t arg6) {
  uint64_t ret = 0;
  asm volatile (
    "mov %[SYSNUM], %%rax\n"
    "mov %[ARG1], %%rdi\n"
    "mov %[ARG2], %%rsi\n"
    "mov %[ARG3], %%rdx\n"
    "mov %[ARG4], %%r10\n"
    "mov %[ARG5], %%r8\n"
    "mov %[ARG6], %%r9\n"
    "int $0x80\n"
    "mov %%rax, %[RESULT]\n"
    : [RESULT]"=r"(ret)
    : [SYSNUM]"r"(num),
      [ARG1]"r"(arg1),
      [ARG2]"r"(arg2),
      [ARG3]"r"(arg3),
      [ARG4]"r"(arg4),
      [ARG5]"r"(arg5),
      [ARG6]"r"(arg6)
    : "rax", "rdi", "rsi", "rdx", "r10", "r8", "r9", "memory"
  );
  return ret;
}