update `user` crate to 2018 edition. add travis for user

.travis.yml

@@ -38,4 +38,5 @@ before_script:
   - (test -x $HOME/.cargo/bin/bootimage || cargo install bootimage)
 
 script:
-  - cd kernel && make build arch=$ARCH
+  - cd kernel && make build arch=$ARCH && cd ..
+  - cd user && make arch=$ARCH

user/Cargo.toml

@@ -2,6 +2,7 @@
 name = "ucore-user-programs"
 version = "0.1.0"
 authors = ["Runji Wang <wangrunji0408@163.com>"]
+edition = "2018"
 
 [dependencies]
 "ucore-ulib" = { path = "ucore-ulib" }

user/Makefile

@@ -1,4 +1,4 @@
-# arch = {riscv32, x86_64}
+# arch = {riscv32, x86_64, aarch64}
 arch := riscv32
 
 all:

user/ucore-ulib/Cargo.toml

@@ -2,5 +2,6 @@
 name = "ucore-ulib"
 version = "0.1.0"
 authors = ["WangRunji <wangrunji0408@163.com>"]
+edition = "2018"
 
 [dependencies]

user/ucore-ulib/src/lang_items.rs

@@ -1,4 +1,4 @@
-use syscall::sys_exit;
+use crate::syscall::sys_exit;
 use core::alloc::Layout;
 use core::panic::PanicInfo;
 
@@ -17,7 +17,7 @@ pub extern fn _start(_argc: isize, _argv: *const *const u8) -> ! {
 #[lang = "eh_personality"]
 fn eh_personality() {}
 
-#[panic_implementation]
+#[panic_handler]
 fn panic(info: &PanicInfo) -> ! {
     let location = info.location().unwrap();
     let message = info.message().unwrap();

user/ucore-ulib/src/lib.rs

@@ -1,7 +1,6 @@
 #![no_std]
 #![feature(asm)]
 #![feature(lang_items)]
-#![feature(panic_implementation)]
 #![feature(panic_info_message)]
 #![feature(linkage)]
 #![feature(compiler_builtins_lib)]