SYS_munmap         21 src/pkg/runtime/sys_freebsd_arm.s #define SYS_munmap (SYS_BASE + 73)
SYS_munmap         29 src/pkg/runtime/sys_linux_arm.s #define SYS_munmap (SYS_BASE + 91)
SYS_munmap         17 src/pkg/runtime/syscall_nacl.h #define SYS_munmap 22