Utility to find syscall ordinals on ARMv8 64-bit

syscalls.c

/*
 *  gcc -D__ARCH_WANT_SYSCALL_DEPRECATED syscalls.c
 *
 *  Thank you rmuir!
 */

#include <linux/audit.h>
#include <asm/unistd.h>
#include <stdio.h>

/* amd64-specific, set limit to block X32 abi syscalls: see syscall(2) */
#ifdef __X32_SYSCALL_BIT
  #define LIMIT (__X32_SYSCALL_BIT - 1)
#else
  #define LIMIT 0xFFFFFFFF
#endif

int
main(int argc, char *argv[]) {
  /* replace this w/ AUDIT_XXX from linux/audit.h. syscall_get_arch()
needs newish linux */
  printf("audit: %x\n", AUDIT_ARCH_AARCH64);
  printf("limit: %x\n", LIMIT);
  printf("fork: %d\n", __NR_fork);
  printf("vfork: %d\n", __NR_vfork);
  printf("execve: %d\n", __NR_execve);
  printf("execveat: %d\n", __NR_execveat);
  printf("seccomp: %d\n", __NR_seccomp);
  return 0;
}