drop cargo-xbuild build dependency

.github/workflows/rust.yml

@@ -8,6 +8,7 @@ on:
 name: Rust
 
 jobs:
+  # TODO switch to beta and then to stable
   check:
     name: Check firmware
     runs-on: ubuntu-latest
@@ -18,32 +19,14 @@ jobs:
       - name: Install nightly toolchain
         uses: actions-rs/toolchain@v1
         with:
-          components: rust-src # needed by cargo-xbuild
+          target: armv7a-none-eabi
           toolchain: nightly
           override: true
 
-      - name: Cache cargo installs
-        id: cache-cargo-bin
-        uses: actions/cache@v1
-        with:
-          path: ~/.cargo/bin
-          key: ${{ runner.os }}-cargo-bin-${{ hashFiles('dev-dependencies.txt') }}
-
-      - name: Install dev-dependencies
-        # NOTE we need this check because the cache action won't restore `.cargo/.{crates2.json,.crates.toml}`
-        if: steps.cache-cargo-bin.outputs.cache-hit != 'true'
-        # FIXME `cache-hit` is not being set when the cache is found
-        # (is it because there's a permission error when un-tar-ing it?)
-        run: |
-          which cargo-audit || cargo install `cat dev-dependencies.txt`
-
-      - name: Set environment for cargo-xbuild
-        run: echo ::set-env name=RUST_TARGET_PATH::$(echo ${GITHUB_WORKSPACE}/firmware )
-
-      - name: Run cargo xcheck
+      - name: Run cargo check
         working-directory: ./firmware
         run: |
-          cargo xcheck
+          cargo check
 
 # NOTE the `common` directory is currently empty so this is a no-op
 # host-test:
@@ -110,35 +93,25 @@ jobs:
 #     - name: Install nightly toolchain
 #       uses: actions-rs/toolchain@v1
 #       with:
-#         components: rust-src # needed by cargo-xbuild
+#         target: armv7a-none-eabi
 #         toolchain: nightly
 #         override: true
 
-#     - name: Cache cargo installs
-#       id: cache-cargo-bin
-#       uses: actions/cache@v1
-#       with:
-#         path: ~/.cargo/bin
-#         key: ${{ runner.os }}-cargo-bin-${{ hashFiles('dev-dependencies.txt') }}
-
 #     - name: Install QEMU
 #       run: |
 #         sudo apt update
 #         sudo apt install qemu-system-arm
 
-#     - name: Install dev-dependencies
-#       if: steps.cache-cargo-bin.outputs.cache-hit != 'true'
+#     - name: Install flip-lld
 #       run: |
-#         cargo install `cat dev-dependencies.txt`
-
-#     - name: Set environment for cargo-xbuild
-#       run: echo ::set-env name=RUST_TARGET_PATH::$(echo ${GITHUB_WORKSPACE}/firmware )
+#         cargo install --git https://github.com/japaric/flip-lld
 
 #     - name: Run examples
 #       working-directory: ./firmware/usbarmory
 #       run: |
-#         cargo xrun --example qemu-hello --release
+#         cargo run --example qemu-hello --release
 
+  # TODO switch to beta and then to stable
   # test that all our examples link
   it_links:
     name: Check that all examples link in dev and release mode
@@ -150,39 +123,36 @@ jobs:
       - name: Install nightly toolchain
         uses: actions-rs/toolchain@v1
         with:
-          components: rust-src # needed by cargo-xbuild
+          target: armv7a-none-eabi
           toolchain: nightly
           override: true
 
-      - name: Cache cargo installs
-        id: cache-cargo-bin
-        uses: actions/cache@v1
-        with:
-          path: ~/.cargo/bin
-          key: ${{ runner.os }}-cargo-bin-${{ hashFiles('dev-dependencies.txt') }}
+      # - name: Cache cargo installs
+      #   id: cache-cargo-bin
+      #   uses: actions/cache@v1
+      #   with:
+      #     path: ~/.cargo/bin
+      #     key: ${{ runner.os }}-cargo-bin-${{ hashFiles('dev-dependencies.txt') }}
 
-      - name: Install dev-dependencies
-        if: steps.cache-cargo-bin.outputs.cache-hit != 'true'
-        run: |
-          which cargo-audit || cargo install `cat dev-dependencies.txt`
+      # - name: Install dev-dependencies
+      #   if: steps.cache-cargo-bin.outputs.cache-hit != 'true'
+      #   run: |
+      #     which flip-lld || cargo install `cat dev-dependencies.txt`
 
       # TODO cache in dev-dependencies.txt when available on crates.io
       - name: Install flip-lld
         run: |
           cargo install --git https://github.com/japaric/flip-lld
 
-      - name: Set environment for cargo-xbuild
-        run: echo ::set-env name=RUST_TARGET_PATH::$(echo ${GITHUB_WORKSPACE}/firmware )
-
       - name: Build examples using the dev profile
         working-directory: ./firmware/usbarmory
         run: |
-          cargo xbuild --examples
+          cargo build --examples
 
       - name: Build examples using the release profile
         working-directory: ./firmware/usbarmory
         run: |
-          cargo xbuild --examples --release
+          cargo build --examples --release
 
   fmt:
     name: Rustfmt
@@ -205,39 +175,25 @@ jobs:
         run: |
           cargo fmt --all -- --check
 
+  # TODO switch to beta and then to stable
   clippy:
     name: Clippy
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
 
-      - name: Install stable toolchain
+      - name: Install nightly toolchain
         uses: actions-rs/toolchain@v1
         with:
-          components: rust-src # needed by cargo-xbuild
+          target: armv7a-none-eabi
           toolchain: nightly
           override: true
 
-      - name: Cache cargo installs
-        id: cache-cargo-bin
-        uses: actions/cache@v1
-        with:
-          path: ~/.cargo/bin
-          key: ${{ runner.os }}-cargo-bin-${{ hashFiles('dev-dependencies.txt') }}
-
-      - name: Install dev-dependencies
-        if: steps.cache-cargo-bin.outputs.cache-hit != 'true'
-        run: |
-          which cargo-audit || cargo install `cat dev-dependencies.txt`
-
       - name: Install clippy
         run: rustup component add clippy
 
-      - name: Set environment for cargo-xbuild
-        run: echo ::set-env name=RUST_TARGET_PATH::$(echo ${GITHUB_WORKSPACE}/firmware )
-
       - name: Run cargo clippy
         working-directory: ./firmware
         run: |
-          cargo xclippy -- -D warnings
+          cargo clippy -- -D warnings

dev-dependencies.txt

@@ -1 +1 @@
-cargo-audit cargo-xbuild
+cargo-audit

firmware/.cargo/config

@@ -1,3 +1,3 @@
 [build]
-target = "armv7-none-eabi" # soft float ABI, emulated float operations
-# target = "armv7-none-eabihf" # hard float ABI, float operations on hardware
+target = "armv7a-none-eabi" # soft float ABI, emulated float operations
+# target = "armv7a-none-eabihf" # hard float ABI, float operations on hardware

firmware/README.md

@@ -4,14 +4,11 @@ Cortex-A7.
 There are two compilation targets (see `--target` in `rustc -h`) for this
 embedded target:
 
-- armv7-none-eabihf, hard float ABI; float operations are performed on the
+- armv7a-none-eabihf, hard float ABI; float operations are performed on the
   hardware FPU. NOTE: currently untested
 
-- armv7-none-eabi, soft float ABI; float operations are emulated
+- armv7a-none-eabi, soft float ABI; float operations are emulated
 
 The default compilation target for the whole directory is currently set to the
 most compatible soft float target. If you need to use the hard float target
-modify `.cargo/config`, or pass `--target armv7-none-eabihf` to Xargo.
-
-*NOTE* all the code under this directory needs Rust nightly and Xargo. See the
-README in the [`usbarmory`](usbarmory) directory for more information.
+modify `.cargo/config`, or pass `--target armv7a-none-eabihf` to Cargo.

firmware/cortex-a/asm.s

@@ -72,3 +72,8 @@ __isb:
 __wfi:
   wfi
   bx lr
+
+  .global __udf
+  .section .text.__udf
+__udf:
+  udf

firmware/cortex-a/assemble.sh

@@ -7,11 +7,11 @@ main() {
 
     # NOTE: cflags taken from cc 1.0.49 / armv7-unknown-linux-gnueabi
     arm-none-eabi-as -march=armv7-a asm.s -o bin/$pkg_name.o
-    ar crs bin/armv7-none-eabi.a bin/$pkg_name.o
+    ar crs bin/armv7a-none-eabi.a bin/$pkg_name.o
 
     # cc uses the same flags for the gnueabihf variant
     arm-none-eabi-as -march=armv7-a+vfpv3 asm.s -o bin/$pkg_name.o
-    ar crs bin/armv7-none-eabihf.a bin/$pkg_name.o
+    ar crs bin/armv7a-none-eabihf.a bin/$pkg_name.o
 
     rm bin/*.o
 }

firmware/cortex-a/src/lib.rs

@@ -1,7 +1,5 @@
 //! Low level access to Cortex-A processors
 
-// FIXME replace inline assembly with external assembly
-#![feature(asm)]
 #![no_std]
 #![warn(missing_docs, rust_2018_idioms, unused_qualifications)]
 
@@ -110,3 +108,14 @@ pub fn wfi() {
 
     unsafe { __wfi() }
 }
+
+/// UnDeFined instruction
+///
+/// Calling this will result in a `UndefinedInstrution` exception
+pub fn udf() -> ! {
+    extern "C" {
+        fn __udf() -> !;
+    }
+
+    unsafe { __udf() }
+}

firmware/cortex-a/src/register/cpsr.rs

@@ -1,6 +1,7 @@
 //! Current Program Status Register
 
 /// Reads the CPSR register
+#[cfg(TODO = "external-assembly")]
 pub fn read() -> u32 {
     let cpsr: u32;
     unsafe { asm!("mrs $0, cpsr" : "=r"(cpsr)) }

firmware/cortex-a/src/register/scr.rs

@@ -1,6 +1,7 @@
 //! Security Control Register
 
 /// Reads the SCR register
+#[cfg(TODO = "external-assembly")]
 pub fn read() -> u16 {
     let scr;
     unsafe { asm!("mrc p15, 0, $0, c1, c1, 0" : "=r"(scr)) }

firmware/cortex-a/src/register/sctlr.rs

@@ -1,6 +1,7 @@
 //! System Control Register
 
 /// Reads the SCTLR register
+#[cfg(TODO = "external-assembly")]
 pub fn read() -> u32 {
     let sctlr;
     unsafe { asm!("mrc p15, 0, $0, c1, c1, 0" : "=r"(sctlr)) }

firmware/usbarmory-rt/assemble.sh

@@ -8,11 +8,11 @@ main() {
     # NOTE: cflags taken from cc 1.0.49 / armv7-unknown-linux-gnueabi
     arm-none-eabi-as -march=armv7-a asm-common.s -o bin/$crate-common.o
     arm-none-eabi-as -march=armv7-a asm-no-vfp.s -o bin/$crate-no-vfp.o
-    ar crs bin/armv7-none-eabi.a bin/$crate-{common,no-vfp}.o
+    ar crs bin/armv7a-none-eabi.a bin/$crate-{common,no-vfp}.o
 
     arm-none-eabi-as -march=armv7-a+vfpv3 asm-common.s -o bin/$crate-common.o
     arm-none-eabi-as -march=armv7-a+vfpv3 asm-vfp.s -o bin/$crate-vfp.o
-    ar crs bin/armv7-none-eabihf.a bin/$crate-{common,vfp}.o
+    ar crs bin/armv7a-none-eabihf.a bin/$crate-{common,vfp}.o
 
     rm bin/*.o
 }

firmware/usbarmory/.cargo/config

@@ -1,15 +1,15 @@
-[target.armv7-none-eabi]
+[target.armv7a-none-eabi]
 runner = "qemu-system-arm -cpu cortex-a7 -machine mcimx6ul-evk -nographic -semihosting-config enable=on,target=native -kernel"
 rustflags = [
   "-C", "linker=flip-lld",
   "-C", "link-arg=-Tlink.x",
 ]
 
-[target.armv7-none-eabihf]
+[target.armv7a-none-eabihf]
 rustflags = [
   "-C", "linker=flip-lld",
   "-C", "link-arg=-Tlink.x",
 ]
 
 [build]
-target = "armv7-none-eabi"
+target = "armv7a-none-eabi"