From 3e5885f7d2ad5c22a39b23e4b37b3b8483470e1e Mon Sep 17 00:00:00 2001
From: Folkert <folkert@folkertdev.nl>
Date: Sun, 4 Aug 2024 22:24:20 +0200
Subject: [PATCH] changes after review

---
 .../example/.cargo/{config => config.toml}    |  5 ++-
 tests/run-make/thumb-none-qemu/rmake.rs       | 33 ++++++++++++-------
 2 files changed, 24 insertions(+), 14 deletions(-)
 rename tests/run-make/thumb-none-qemu/example/.cargo/{config => config.toml} (90%)

diff --git a/tests/run-make/thumb-none-qemu/example/.cargo/config b/tests/run-make/thumb-none-qemu/example/.cargo/config.toml
similarity index 90%
rename from tests/run-make/thumb-none-qemu/example/.cargo/config
rename to tests/run-make/thumb-none-qemu/example/.cargo/config.toml
index 8b30310e7d432..7152e81b50221 100644
--- a/tests/run-make/thumb-none-qemu/example/.cargo/config
+++ b/tests/run-make/thumb-none-qemu/example/.cargo/config.toml
@@ -1,6 +1,5 @@
 [target.thumbv6m-none-eabi]
-# FIXME: Should be Cortex-M0, but Qemu used by CI is too old
-runner = "qemu-system-arm -cpu cortex-m3 -machine lm3s6965evb -nographic -semihosting-config enable=on,target=native -kernel"
+runner = "qemu-system-arm -cpu cortex-m0 -machine lm3s6965evb -nographic -semihosting-config enable=on,target=native -kernel"
 
 [target.thumbv7m-none-eabi]
 runner = "qemu-system-arm -cpu cortex-m3 -machine lm3s6965evb -nographic -semihosting-config enable=on,target=native -kernel"
@@ -12,7 +11,7 @@ runner = "qemu-system-arm -cpu cortex-m4 -machine lm3s6965evb -nographic -semiho
 runner = "qemu-system-arm -cpu cortex-m4 -machine lm3s6965evb -nographic -semihosting-config enable=on,target=native -kernel"
 
 [target.thumbv8m.base-none-eabi]
-# FIXME: Should be the Cortex-M23, bt Qemu does not currently support it
+# FIXME: Should be the Cortex-M23, but Qemu does not currently support it
 runner = "qemu-system-arm -cpu cortex-m33 -machine lm3s6965evb -nographic -semihosting-config enable=on,target=native -kernel"
 
 [target.thumbv8m.main-none-eabi]
diff --git a/tests/run-make/thumb-none-qemu/rmake.rs b/tests/run-make/thumb-none-qemu/rmake.rs
index e280f5fafa5c0..d0f42bc880897 100644
--- a/tests/run-make/thumb-none-qemu/rmake.rs
+++ b/tests/run-make/thumb-none-qemu/rmake.rs
@@ -1,31 +1,44 @@
+//! This test runs a basic application for thumb targets, using the cortex-m crate.
+//!
+//! These targets are very bare-metal: the first instruction the core runs on
+//! power-on is already user code. The cortex-m-rt has to initialize the stack, .data,
+//! .bss, enable the FPU if present, etc.
+//!
+//! This test builds and runs the applications for various thumb targets using qemu.
+//!
 //! How to run this
 //! $ ./x.py clean
 //! $ ./x.py test --target thumbv6m-none-eabi,thumbv7m-none-eabi tests/run-make
 //!
-//! For supported targets, see `example/.cargo/config`
+//! For supported targets, see `example/.cargo/config.toml`
+//!
+//! FIXME: https://github.com/rust-lang/rust/issues/128733 this test uses external
+//! dependencies, and needs an active internet connection
+//!
+//! FIXME: https://github.com/rust-lang/rust/issues/128734 extract bootstrap cargo
+//! to a proper command
 
 //@ only-thumb
 
 use std::path::PathBuf;
 
-use run_make_support::{cmd, env_var};
+use run_make_support::{cmd, env_var, path_helpers, target};
 
 const CRATE: &str = "example";
 
 fn main() {
     std::env::set_current_dir(CRATE).unwrap();
 
-    let target = env_var("TARGET");
     let bootstrap_cargo = env_var("BOOTSTRAP_CARGO");
     let path = env_var("PATH");
     let rustc = env_var("RUSTC");
 
-    let target_dir = PathBuf::from("target");
-    let manifest_path = PathBuf::from("Cargo.toml");
+    let target_dir = path_helpers::path("target");
+    let manifest_path = path_helpers::path("Cargo.toml");
 
     let debug = {
         let mut cmd = cmd(&bootstrap_cargo);
-        cmd.args(&["run", "--target", &target])
+        cmd.args(&["run", "--target", &target()])
             .env("RUSTFLAGS", "-C linker=arm-none-eabi-ld -C link-arg=-Tlink.x")
             .env("CARGO_TARGET_DIR", &target_dir)
             .env("PATH", &path)
@@ -33,12 +46,11 @@ fn main() {
         cmd.run()
     };
 
-    let stdout = debug.stdout_utf8();
-    assert!(stdout.contains("x = 42"), "stdout: {:?}", stdout);
+    debug.assert_stdout_contains("x = 42");
 
     let release = {
         let mut cmd = cmd(&bootstrap_cargo);
-        cmd.args(&["run", "--release", "--target", &target])
+        cmd.args(&["run", "--release", "--target", &target()])
             .env("RUSTFLAGS", "-C linker=arm-none-eabi-ld -C link-arg=-Tlink.x")
             .env("CARGO_TARGET_DIR", &target_dir)
             .env("PATH", &path)
@@ -46,6 +58,5 @@ fn main() {
         cmd.run()
     };
 
-    let stdout = release.stdout_utf8();
-    assert!(stdout.contains("x = 42"), "stdout: {:?}", stdout);
+    release.assert_stdout_contains("x = 42");
 }