diff --git a/user/Cargo.lock b/user/Cargo.lock
deleted file mode 100644
index 7e2e08e..0000000
--- a/user/Cargo.lock
+++ /dev/null
@@ -1,25 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-[[package]]
-name = "linked_list_allocator"
-version = "0.6.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "spin 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "rcore-user"
-version = "0.1.0"
-dependencies = [
- "linked_list_allocator 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "spin"
-version = "0.4.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[metadata]
-"checksum linked_list_allocator 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "655d57c71827fe0891ce72231b6aa5e14033dae3f604609e6a6f807267c1678d"
-"checksum spin 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "ceac490aa12c567115b40b7b7fceca03a6c9d53d5defea066123debc83c5dc1f"
diff --git a/user/Cargo.toml b/user/Cargo.toml
deleted file mode 100644
index 6122d8e..0000000
--- a/user/Cargo.toml
+++ /dev/null
@@ -1,8 +0,0 @@
-[package]
-name = "rcore-user"
-version = "0.1.0"
-authors = ["Runji Wang <wangrunji0408@163.com>"]
-edition = "2018"
-
-[dependencies]
-linked_list_allocator = "0.6"
\ No newline at end of file
diff --git a/user/Makefile b/user/Makefile
deleted file mode 100644
index 131199a..0000000
--- a/user/Makefile
+++ /dev/null
@@ -1,59 +0,0 @@
-# arch = {riscv32, riscv64, x86_64, aarch64}
-# mode = {debug, release}
-arch ?= riscv32
-mode ?= debug
-
-rust_src_dir := src/bin
-rust_bin_path := target/$(arch)-rcore/$(mode)
-user_rust_bins := $(patsubst $(rust_src_dir)/%.rs, $(rust_bin_path)/%, $(wildcard $(rust_src_dir)/*.rs))
-c_src_dir :=
-c_bin_path :=
-user_c_bins :=
-user_bins := $(user_rust_bins) $(user_c_bins)
-
-build_path := build
-sfsroot := $(build_path)/sfsroot-$(arch)
-sfsimg := $(build_path)/user-$(arch).img
-
-mksfs := mksfs
-
-build_args := --target targets/$(arch)-rcore.json
-ifeq ($(mode), release)
-build_args := $(build_args) --release
-endif
-
-.PHONY: all clean build-rust build-c build mksfs sfsimg
-
-all: $(sfsimg)
-
-build-rust:
-	@echo Building user rust programs
-	@cargo xbuild $(build_args)
-
-build-c:
-	@echo Building user C programs
-
-build: build-rust build-c
-
-$(user_rust_bins): build-rust
-
-$(user_c_bins): build-c
-
-mksfs:
-ifeq ($(shell which $(mksfs)),)
-	@cargo install --git https://github.com/wangrunji0408/SimpleFileSystem-Rust --features="std"
-endif
-
-$(sfsroot): $(user_bins)
-	@mkdir -p $@
-	@cp $^ $@/
-
-$(sfsimg): $(user_bins) $(sfsroot) | mksfs
-	@echo Creating SFS image at $@
-	@$(mksfs) zip $(sfsroot) $@
-
-sfsimg: $(sfsimg)
-
-clean:
-	@cargo clean
-	@rm -rf $(build_path)
diff --git a/user/img/ucore-aarch64.img b/user/img/ucore-aarch64.img
deleted file mode 100644
index ba673f0..0000000
Binary files a/user/img/ucore-aarch64.img and /dev/null differ
diff --git a/user/img/ucore-i386-pic.img b/user/img/ucore-i386-pic.img
deleted file mode 100644
index a70e263..0000000
Binary files a/user/img/ucore-i386-pic.img and /dev/null differ
diff --git a/user/img/ucore-i386.img b/user/img/ucore-i386.img
deleted file mode 100644
index 88949ab..0000000
Binary files a/user/img/ucore-i386.img and /dev/null differ
diff --git a/user/img/ucore-riscv32.img b/user/img/ucore-riscv32.img
deleted file mode 100644
index 9c28ed5..0000000
Binary files a/user/img/ucore-riscv32.img and /dev/null differ
diff --git a/user/img/ucore-riscv64.img b/user/img/ucore-riscv64.img
deleted file mode 100644
index 4b2efb1..0000000
Binary files a/user/img/ucore-riscv64.img and /dev/null differ
diff --git a/user/img/xv6-x86_64.img b/user/img/xv6-x86_64.img
deleted file mode 100644
index 94090c8..0000000
Binary files a/user/img/xv6-x86_64.img and /dev/null differ
diff --git a/user/src/bin/fantastic_text.rs b/user/src/bin/fantastic_text.rs
deleted file mode 100644
index b1403ed..0000000
--- a/user/src/bin/fantastic_text.rs
+++ /dev/null
@@ -1,43 +0,0 @@
-#![no_std]
-#![no_main]
-
-#[macro_use]
-extern crate rcore_user;
-
-macro_rules! color_text {
-    ($text:expr, $color:expr) => {{
-        format_args!("\x1b[{}m{}\x1b[0m", $color, $text)
-    }};
-}
-
-// IMPORTANT: Must define main() like this
-#[no_mangle]
-pub fn main() {
-    println!(
-        "{}{}{}{}{} {}{}{}{} {}{}{}{}{}{}",
-        color_text!("H", 31),
-        color_text!("e", 32),
-        color_text!("l", 33),
-        color_text!("l", 34),
-        color_text!("o", 35),
-        color_text!("R", 36),
-        color_text!("u", 37),
-        color_text!("s", 90),
-        color_text!("t", 91),
-        color_text!("u", 92),
-        color_text!("C", 93),
-        color_text!("o", 94),
-        color_text!("r", 95),
-        color_text!("e", 96),
-        color_text!("!", 97),
-    );
-
-    let text = "reguler \x1b[4munderline\x1b[24m \x1b[7mreverse\x1b[27m \x1b[9mstrikethrough\x1b[29m";
-    println!("\x1b[47m{}\x1b[0m", color_text!(text, 30));
-    for i in 31..38 {
-        println!("{}", color_text!(text, i));
-    }
-    for i in 90..98 {
-        println!("{}", color_text!(text, i));
-    }
-}
diff --git a/user/src/bin/hello_rust.rs b/user/src/bin/hello_rust.rs
deleted file mode 100644
index 56f7d23..0000000
--- a/user/src/bin/hello_rust.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-#![no_std]
-#![no_main]
-
-#[macro_use]
-extern crate rcore_user;
-
-// IMPORTANT: Must define main() like this
-#[no_mangle]
-pub fn main() {
-    println!("Hello Rust uCore!");
-    println!("I am process {}.", rcore_user::syscall::sys_getpid());
-    println!("hello pass.");
-}
diff --git a/user/src/bin/sh.rs b/user/src/bin/sh.rs
deleted file mode 100644
index 43ba90e..0000000
--- a/user/src/bin/sh.rs
+++ /dev/null
@@ -1,39 +0,0 @@
-#![no_std]
-#![no_main]
-#![feature(alloc)]
-
-extern crate alloc;
-#[macro_use]
-extern crate rcore_user;
-
-use alloc::vec::Vec;
-
-use rcore_user::io::get_line;
-use rcore_user::syscall::{sys_exec, sys_fork, sys_wait};
-
-// IMPORTANT: Must define main() like this
-#[no_mangle]
-pub fn main() -> i32 {
-    println!("Rust user shell");
-    loop {
-        print!(">> ");
-        let cmd = get_line();
-        // split cmd, make argc & argv
-        let cmd = cmd.replace(' ', "\0") + "\0";
-        let ptrs: Vec<*const u8> = cmd.split('\0')
-            .filter(|s| !s.is_empty()).map(|s| s.as_ptr()).collect();
-        if ptrs.is_empty() {
-            continue;
-        }
-
-        let pid = sys_fork();
-        assert!(pid >= 0);
-        if pid == 0 {
-            return sys_exec(ptrs[0], ptrs.len(), ptrs.as_ptr());
-        } else {
-            let mut code: i32 = 0;
-            sys_wait(pid as usize, &mut code);
-            println!("\n[Process exited with code {}]", code);
-        }
-    }
-}
diff --git a/user/src/io.rs b/user/src/io.rs
deleted file mode 100644
index cf6c4a1..0000000
--- a/user/src/io.rs
+++ /dev/null
@@ -1,92 +0,0 @@
-use alloc::string::String;
-use core::fmt::{self, Write};
-use core::option::Option;
-
-use crate::syscall::{sys_read, sys_write};
-
-pub const STDIN: usize = 0;
-pub const STDOUT: usize = 1;
-
-#[macro_export]
-macro_rules! print {
-    ($($arg:tt)*) => ({
-        $crate::io::print(format_args!($($arg)*));
-    });
-}
-
-#[macro_export]
-macro_rules! println {
-    ($fmt:expr) => (print!(concat!($fmt, "\n")));
-    ($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
-}
-
-pub fn print(args: fmt::Arguments) {
-    StdOut.write_fmt(args).unwrap();
-}
-
-pub fn getc() -> Option<u8> {
-    let mut c = 0u8;
-    let ret = sys_read(STDIN, &mut c, 1);
-    match ret {
-        1 => Some(c),
-        0 => None,
-        _ => panic!(),
-    }
-}
-
-pub fn get_line() -> String {
-    let mut s = String::new();
-    loop {
-        let ret = getc();
-        match ret {
-            None => return s,
-            Some(byte) => {
-                let c = byte as char;
-                match c {
-                    '\x08' | '\x7f' /* '\b' */ => {
-                        if s.pop().is_some() {
-                            print!("\x08 \x08");
-                        }
-                    }
-                    ' '...'\x7e' => {
-                        s.push(c);
-                        print!("{}", c);
-                    }
-                    '\n' | '\r' => {
-                        print!("\n");
-                        return s;
-                    }
-                    _ => {}
-                }
-            }
-        }
-    }
-}
-
-pub fn putc(c: u8) {
-    sys_write(STDOUT, &c, 1);
-}
-
-struct StdOut;
-
-impl fmt::Write for StdOut {
-    fn write_str(&mut self, s: &str) -> fmt::Result {
-        if sys_write(STDOUT, s.as_ptr(), s.len()) >= 0 {
-            Ok(())
-        } else {
-            Err(fmt::Error::default())
-        }
-    }
-}
-
-/* VFS flags */
-// TODO: use bitflags
-// flags for open: choose one of these
-pub const O_RDONLY: usize = 0; // open for reading only
-pub const O_WRONLY: usize = 1; // open for writing only
-pub const O_RDWR: usize = 2; // open for reading and writing
-// then or in any of these:
-pub const O_CREAT: usize = 0x00000004; // create file if it does not exist
-pub const O_EXCL: usize = 0x00000008; // error if O_CREAT and the file exists
-pub const O_TRUNC: usize = 0x00000010; // truncate file upon open
-pub const O_APPEND: usize = 0x00000020; // append on each write
\ No newline at end of file
diff --git a/user/src/lang_items.rs b/user/src/lang_items.rs
deleted file mode 100644
index f125f8c..0000000
--- a/user/src/lang_items.rs
+++ /dev/null
@@ -1,70 +0,0 @@
-use crate::syscall::{sys_close, sys_dup2, sys_exit, sys_open};
-use crate::io::{O_RDONLY, O_WRONLY, STDIN, STDOUT};
-use crate::ALLOCATOR;
-
-use core::alloc::Layout;
-use core::panic::PanicInfo;
-
-#[linkage = "weak"]
-#[no_mangle]
-fn main() {
-    panic!("No main() linked");
-}
-
-fn initfd(fd2: usize, path: &str, open_flags: usize) -> i32 {
-    let fd1 = sys_open(path, open_flags);
-    if fd1 < 0 {
-        return fd1;
-    }
-    let mut ret = fd1;
-    let fd1 = fd1 as usize;
-    if fd1 != fd2 {
-        sys_close(fd2);
-        ret = sys_dup2(fd1, fd2);
-        sys_close(fd1);
-    }
-    return ret;
-}
-
-fn init_heap() {
-    const HEAP_SIZE: usize = 0x1000;
-    static mut HEAP: [u8; HEAP_SIZE] = [0; HEAP_SIZE];
-    unsafe { ALLOCATOR.lock().init(HEAP.as_ptr() as usize, HEAP_SIZE); }
-}
-
-#[no_mangle]
-pub extern "C" fn _start(_argc: isize, _argv: *const *const u8) -> ! {
-    let fd = initfd(STDIN, "stdin:", O_RDONLY);
-    if fd < 0 {
-        panic!("open <stdin> failed: {}.", fd);
-    }
-    let fd = initfd(STDOUT, "stdout:", O_WRONLY);
-    if fd < 0 {
-        panic!("open <stdout> failed: {}.", fd);
-    }
-
-    init_heap();
-    main();
-    sys_exit(0)
-}
-
-#[lang = "eh_personality"]
-fn eh_personality() {}
-
-#[panic_handler]
-fn panic(info: &PanicInfo) -> ! {
-    let location = info.location().unwrap();
-    let message = info.message().unwrap();
-    println!("\n\nPANIC in {} at line {}\n    {}", location.file(), location.line(), message);
-    sys_exit(1)
-}
-
-#[lang = "oom"]
-fn oom(_: Layout) -> ! {
-    panic!("out of memory");
-}
-
-#[no_mangle]
-pub extern "C" fn abort() -> ! {
-    sys_exit(2)
-}
diff --git a/user/src/lib.rs b/user/src/lib.rs
deleted file mode 100644
index 3863e78..0000000
--- a/user/src/lib.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-#![no_std]
-#![feature(asm)]
-#![feature(alloc)]
-#![feature(lang_items)]
-#![feature(panic_info_message)]
-#![feature(linkage)]
-#![feature(compiler_builtins_lib)]
-
-extern crate alloc;
-
-#[macro_use]
-pub mod io;
-pub mod syscall;
-pub mod lang_items;
-
-use linked_list_allocator::LockedHeap;
-
-#[global_allocator]
-static ALLOCATOR: LockedHeap = LockedHeap::empty();
\ No newline at end of file
diff --git a/user/src/syscall.rs b/user/src/syscall.rs
deleted file mode 100644
index b674201..0000000
--- a/user/src/syscall.rs
+++ /dev/null
@@ -1,133 +0,0 @@
-#[inline(always)]
-fn sys_call(syscall_id: SyscallId, arg0: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) -> i32 {
-    let id = syscall_id as usize;
-    let ret: i32;
-
-    unsafe {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-            asm!("ecall"
-            : "={x10}" (ret)
-            : "{x10}" (id), "{x11}" (arg0), "{x12}" (arg1), "{x13}" (arg2), "{x14}" (arg3), "{x15}" (arg4), "{x16}" (arg5)
-            : "memory"
-            : "volatile");
-        #[cfg(target_arch = "x86")]
-            asm!("int 0x80"
-            : "={eax}" (ret)
-            : "{eax}" (id), "{edx}" (arg0), "{ecx}" (arg1), "{ebx}" (arg2), "{edi}" (arg3), "{esi}" (arg4)
-            : "memory"
-            : "intel" "volatile");
-        #[cfg(target_arch = "x86_64")]
-            asm!("syscall"
-            : "={rax}" (ret)
-            : "{rax}" (id), "{rdi}" (arg0), "{rsi}" (arg1), "{rdx}" (arg2), "{rcx}" (arg3), "{r8}" (arg4), "{r9}" (arg5)
-            : "memory"
-            : "intel" "volatile");
-        #[cfg(target_arch = "aarch64")]
-            asm!("svc 0"
-            : "={x0}" (ret)
-            : "{x8}" (id), "{x0}" (arg0), "{x1}" (arg1), "{x2}" (arg2), "{x3}" (arg3), "{x4}" (arg4), "{x5}" (arg5)
-            : "memory"
-            : "volatile");
-    }
-    ret
-}
-
-pub fn sys_exit(code: usize) -> ! {
-    sys_call(SyscallId::Exit, code, 0, 0, 0, 0, 0);
-    unreachable!()
-}
-
-
-pub fn sys_exec(name: *const u8, argc: usize, argv: *const *const u8) -> i32 {
-    sys_call(SyscallId::Exec, name as usize, argc, argv as usize, 0, 0, 0)
-}
-
-pub fn sys_write(fd: usize, base: *const u8, len: usize) -> i32 {
-    sys_call(SyscallId::Write, fd, base as usize, len, 0, 0, 0)
-}
-
-pub fn sys_read(fd: usize, base: *mut u8, len: usize) -> i32 {
-    sys_call(SyscallId::Read, fd, base as usize, len, 0, 0, 0)
-}
-
-pub fn sys_open(path: &str, flags: usize) -> i32 {
-    // UNSAFE: append '\0' to the string
-    use core::mem::replace;
-    let end = unsafe { &mut *(path.as_ptr().offset(path.len() as isize) as *mut u8) };
-    let backup = replace(end, 0);
-    let ret = sys_call(SyscallId::Open, path.as_ptr() as usize, flags, 0, 0, 0, 0);
-    *end = backup;
-    ret
-}
-
-pub fn sys_close(fd: usize) -> i32 {
-    sys_call(SyscallId::Close, fd, 0, 0, 0, 0, 0)
-}
-
-pub fn sys_dup2(fd1: usize, fd2: usize) -> i32 {
-    sys_call(SyscallId::Dup2, fd1, fd2, 0, 0, 0, 0)
-}
-
-/// Fork the current process. Return the child's PID.
-pub fn sys_fork() -> i32 {
-    sys_call(SyscallId::Fork, 0, 0, 0, 0, 0, 0)
-}
-
-/// Wait the process exit.
-/// Return the PID. Store exit code to `code` if it's not null.
-pub fn sys_wait(pid: usize, code: *mut i32) -> i32 {
-    sys_call(SyscallId::Wait, pid, code as usize, 0, 0, 0, 0)
-}
-
-pub fn sys_yield() -> i32 {
-    sys_call(SyscallId::Yield, 0, 0, 0, 0, 0, 0)
-}
-
-/// Kill the process
-pub fn sys_kill(pid: usize) -> i32 {
-    sys_call(SyscallId::Kill, pid, 0, 0, 0, 0, 0)
-}
-
-/// Get the current process id
-pub fn sys_getpid() -> i32 {
-    sys_call(SyscallId::GetPid, 0, 0, 0, 0, 0, 0)
-}
-
-pub fn sys_sleep(time: usize) -> i32 {
-    sys_call(SyscallId::Sleep, time, 0, 0, 0, 0, 0)
-}
-
-pub fn sys_get_time() -> i32 {
-    sys_call(SyscallId::GetTime, 0, 0, 0, 0, 0, 0)
-}
-
-pub fn sys_set_priority(priority: usize) -> i32 {
-    sys_call(SyscallId::SetPriority, priority, 0, 0, 0, 0, 0)
-}
-
-#[allow(dead_code)]
-enum SyscallId {
-    Exit = 60,
-    Fork = 57,
-    Wait = 61,
-    Exec = 59,
-    Clone = 56,
-    Yield = 24,
-    Sleep = 35,
-    Kill = 62,
-    GetTime = 96,
-    GetPid = 39,
-    Mmap = 9,
-    Munmap = 11,
-    Open = 2,
-    Close = 3,
-    Read = 0,
-    Write = 1,
-    Seek = 8,
-    Fstat = 4,
-    Fsync = 74,
-    GetCwd = 79,
-    GetDirEntry = 78,
-    Dup2 = 33,
-    SetPriority = 141,
-}
diff --git a/user/targets/aarch64-rcore.json b/user/targets/aarch64-rcore.json
deleted file mode 100644
index a4adac2..0000000
--- a/user/targets/aarch64-rcore.json
+++ /dev/null
@@ -1,35 +0,0 @@
-{
-  "abi-blacklist": [
-    "stdcall",
-    "fastcall",
-    "vectorcall",
-    "thiscall",
-    "win64",
-    "sysv64"
-  ],
-  "arch": "aarch64",
-  "data-layout": "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128",
-  "executables": true,
-  "linker": "rust-lld",
-  "linker-flavor": "ld.lld",
-  "linker-is-gnu": true,
-  "pre-link-args": {
-    "ld.lld": [
-      "--image-base=0xffff000000000000"
-    ]
-  },
-  "llvm-target": "aarch64-unknown-none",
-  "no-compiler-rt": true,
-  "features": "+a53,+strict-align,-neon",
-  "max-atomic-width": 128,
-  "os": "none",
-  "panic": "abort",
-  "panic-strategy": "abort",
-  "relocation-model": "static",
-  "position-independent-executables": true,
-  "target-c-int-width": "32",
-  "target-endian": "little",
-  "target-pointer-width": "64",
-  "target-family": "unix",
-  "disable-redzone": true
-}
diff --git a/user/targets/i686-rcore.json b/user/targets/i686-rcore.json
deleted file mode 100644
index b5138ec..0000000
--- a/user/targets/i686-rcore.json
+++ /dev/null
@@ -1,15 +0,0 @@
-{
-  "arch": "x86",
-  "cpu": "pentium4",
-  "data-layout": "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128",
-  "executables": true,
-  "linker-flavor": "ld.lld",
-  "linker": "rust-lld",
-  "llvm-target": "i686",
-  "max-atomic-width": 64,
-  "os": "none",
-  "target-c-int-width": "32",
-  "target-endian": "little",
-  "target-pointer-width": "32",
-  "features": "-mmx,-sse,+soft-float"
-}
\ No newline at end of file
diff --git a/user/targets/riscv32-rcore.json b/user/targets/riscv32-rcore.json
deleted file mode 100644
index aa03e0c..0000000
--- a/user/targets/riscv32-rcore.json
+++ /dev/null
@@ -1,30 +0,0 @@
-{
-  "llvm-target": "riscv32",
-  "data-layout": "e-m:e-p:32:32-i64:64-n32-S128",
-  "target-endian": "little",
-  "target-pointer-width": "32",
-  "target-c-int-width": "32",
-  "os": "none",
-  "arch": "riscv32",
-  "cpu": "generic-rv32",
-  "features": "+m,+a,+c",
-  "max-atomic-width": "32",
-  "linker": "rust-lld",
-  "linker-flavor": "ld.lld",
-  "executables": true,
-  "panic-strategy": "abort",
-  "relocation-model": "static",
-  "abi-blacklist": [
-    "cdecl",
-    "stdcall",
-    "fastcall",
-    "vectorcall",
-    "thiscall",
-    "aapcs",
-    "win64",
-    "sysv64",
-    "ptx-kernel",
-    "msp430-interrupt",
-    "x86-interrupt"
-  ]
-}
diff --git a/user/targets/riscv64-rcore.json b/user/targets/riscv64-rcore.json
deleted file mode 100644
index fe95ada..0000000
--- a/user/targets/riscv64-rcore.json
+++ /dev/null
@@ -1,30 +0,0 @@
-{
-  "llvm-target": "riscv64",
-  "data-layout": "e-m:e-p:64:64-i64:64-n64-S128",
-  "target-endian": "little",
-  "target-pointer-width": "64",
-  "target-c-int-width": "32",
-  "os": "none",
-  "arch": "riscv64",
-  "cpu": "generic-rv64",
-  "features": "+m,+a,+c",
-  "max-atomic-width": "64",
-  "linker": "rust-lld",
-  "linker-flavor": "ld.lld",
-  "executables": true,
-  "panic-strategy": "abort",
-  "relocation-model": "static",
-  "abi-blacklist": [
-    "cdecl",
-    "stdcall",
-    "fastcall",
-    "vectorcall",
-    "thiscall",
-    "aapcs",
-    "win64",
-    "sysv64",
-    "ptx-kernel",
-    "msp430-interrupt",
-    "x86-interrupt"
-  ]
-}
diff --git a/user/targets/x86_64-rcore.json b/user/targets/x86_64-rcore.json
deleted file mode 100644
index 6510efa..0000000
--- a/user/targets/x86_64-rcore.json
+++ /dev/null
@@ -1,15 +0,0 @@
-{
-  "llvm-target": "x86_64-unknown-none",
-  "data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
-  "arch": "x86_64",
-  "target-endian": "little",
-  "target-pointer-width": "64",
-  "target-c-int-width": "32",
-  "os": "none",
-  "executables": true,
-  "linker": "rust-lld",
-  "linker-flavor": "ld.lld",
-  "panic-strategy": "abort",
-  "disable-redzone": true,
-  "features": "-mmx,-sse,+soft-float"
-}