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Message-Id: <20240905-mips-rust-v2-3-409d66819418@flygoat.com>
Date: Thu, 05 Sep 2024 14:33:07 +0100
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Masahiro Yamada <masahiroy@...nel.org>,
  Nathan Chancellor <nathan@...nel.org>,
 Nicolas Schier <nicolas@...sle.eu>,  Richard Weinberger <richard@....at>,
  Anton Ivanov <anton.ivanov@...bridgegreys.com>,
  Johannes Berg <johannes@...solutions.net>,
  Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
  Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>,  x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.com>,  Miguel Ojeda <ojeda@...nel.org>,
 Alex Gaynor <alex.gaynor@...il.com>,
  Wedson Almeida Filho <wedsonaf@...il.com>,
  Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
  Björn Roy Baron <bjorn3_gh@...tonmail.com>,
  Benno Lossin <benno.lossin@...ton.me>,
  Andreas Hindborg <a.hindborg@...sung.com>,
  Alice Ryhl <aliceryhl@...gle.com>,
  Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
  Steven Rostedt <rostedt@...dmis.org>,
  Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,  Jonathan Corbet <corbet@....net>,
 Alex Shi <alexs@...nel.org>,  Yanteng Si <siyanteng@...ngson.cn>,
  Nick Desaulniers <ndesaulniers@...gle.com>,
  Bill Wendling <morbo@...gle.com>,
 Justin Stitt <justinstitt@...gle.com>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-um@...ts.infradead.org, rust-for-linux@...r.kernel.org, 
 linux-mips@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org, llvm@...ts.linux.dev, 
 Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH v2 3/3] rust: Enable for MIPS

Enable rust for linux by implement generate_rust_target.rs
and select relevant Kconfig options.

We don't use builtin target as there is no sutiable baremetal
target for us that can cover all ISA variants supported by kernel.

Link: https://github.com/Rust-for-Linux/linux/issues/107
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
v2:
	- Add micromips flags
	- Sync issues with upstream
---
 Documentation/rust/arch-support.rst                |  1 +
 .../translations/zh_CN/rust/arch-support.rst       |  1 +
 arch/mips/Kconfig                                  |  2 +
 scripts/generate_rust_target.rs                    | 68 ++++++++++++++++++++++
 4 files changed, 72 insertions(+)

diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst
index 750ff371570a..ab6c0ae5a407 100644
--- a/Documentation/rust/arch-support.rst
+++ b/Documentation/rust/arch-support.rst
@@ -17,6 +17,7 @@ Architecture   Level of support  Constraints
 =============  ================  ==============================================
 ``arm64``      Maintained        Little Endian only.
 ``loongarch``  Maintained        \-
+``mips``       Maintained        \-
 ``riscv``      Maintained        ``riscv64`` only.
 ``um``         Maintained        \-
 ``x86``        Maintained        ``x86_64`` only.
diff --git a/Documentation/translations/zh_CN/rust/arch-support.rst b/Documentation/translations/zh_CN/rust/arch-support.rst
index abd708d48f82..1eaa6c3297ac 100644
--- a/Documentation/translations/zh_CN/rust/arch-support.rst
+++ b/Documentation/translations/zh_CN/rust/arch-support.rst
@@ -21,6 +21,7 @@
 =============  ================  ==============================================
 ``arm64``      Maintained        只有小端序
 ``loongarch``  Maintained        \-
+``mips``       Maintained        \-
 ``riscv``      Maintained        只有 ``riscv64``
 ``um``         Maintained        只有 ``x86_64``
 ``x86``        Maintained        只有 ``x86_64``
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 43da6d596e2b..a91f0a4fd8e9 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -90,6 +90,8 @@ config MIPS
 	select HAVE_PERF_USER_STACK_DUMP
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_RSEQ
+	select HAVE_RUST
+	select HAVE_GENERATE_RUST_TARGET
 	select HAVE_SPARSE_SYSCALL_NR
 	select HAVE_STACKPROTECTOR
 	select HAVE_SYSCALL_TRACEPOINTS
diff --git a/scripts/generate_rust_target.rs b/scripts/generate_rust_target.rs
index 863720777313..bbdf8a4dd169 100644
--- a/scripts/generate_rust_target.rs
+++ b/scripts/generate_rust_target.rs
@@ -141,6 +141,13 @@ fn has(&self, option: &str) -> bool {
         let option = "CONFIG_".to_owned() + option;
         self.0.contains_key(&option)
     }
+
+    /// Returns the value of the option in the configuration.
+    /// The argument must be passed without the `CONFIG_` prefix.
+    fn get(&self, option: &str) -> Option<&String> {
+        let option = "CONFIG_".to_owned() + option;
+        self.0.get(&option)
+    }
 }
 
 fn main() {
@@ -203,6 +210,67 @@ fn main() {
         ts.push("target-pointer-width", "32");
     } else if cfg.has("LOONGARCH") {
         panic!("loongarch uses the builtin rustc loongarch64-unknown-none-softfloat target");
+    } else if cfg.has("MIPS") {
+        let mut features = "+soft-float,+noabicalls".to_string();
+
+        if cfg.has("CPU_MICROMIPS") {
+            features += ",+micromips";
+        }
+
+        if cfg.has("64BIT") {
+            ts.push("arch", "mips64");
+            ts.push("abi", "abi64");
+            cfg.get("TARGET_ISA_REV").map(|isa_rev| {
+                let feature = match isa_rev.as_str() {
+                    "1" => ",+mips64",
+                    "2" => ",+mips64r2",
+                    "5" => ",+mips64r5",
+                    "6" => ",+mips64r6",
+                    _ => ",+mips3",
+                };
+                features += feature;
+            });
+
+            ts.push("features", features);
+            if cfg.has("CPU_BIG_ENDIAN") {
+                ts.push(
+                    "data-layout",
+                    "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128",
+                );
+                ts.push("llvm-target", "mips64-unknown-linux-gnuabi64");
+            } else {
+                ts.push(
+                    "data-layout",
+                    "e-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128",
+                );
+                ts.push("llvm-target", "mips64el-unknown-linux-gnuabi64");
+            }
+            ts.push("target-pointer-width", "64");
+        } else {
+            ts.push("arch", "mips");
+            cfg.get("TARGET_ISA_REV").map(|isa_rev| {
+                let feature = match isa_rev.as_str() {
+                    "1" => ",+mips32",
+                    "2" => ",+mips32r2",
+                    "5" => ",+mips32r5",
+                    "6" => ",+mips32r6",
+                    _ => ",+mips2",
+                };
+                features += feature;
+            });
+
+            ts.push("features", features);
+            if cfg.has("CPU_BIG_ENDIAN") {
+                ts.push("data-layout",
+                        "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64");
+                ts.push("llvm-target", "mips-unknown-linux-gnu");
+            } else {
+                ts.push("data-layout",
+                        "e-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64");
+                ts.push("llvm-target", "mipsel-unknown-linux-gnu");
+            }
+            ts.push("target-pointer-width", "32");
+        }
     } else {
         panic!("Unsupported architecture");
     }

-- 
2.46.0


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