LoongArch: Enable initial Rust support

Enable initial Rust support for LoongArch.

Tested-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst
index b91e9ef4d0c21e45a4beb27eb8ac9f32a4d6669a..73203ba1e9011e3a5eb5d58f598f00f34b4ece80 100644 (file)
--- a/Documentation/rust/arch-support.rst
+++ b/Documentation/rust/arch-support.rst
@@ -12,10 +12,11 @@ which uses ``libclang``.
 Below is a general summary of architectures that currently work. Level of
 support corresponds to ``S`` values in the ``MAINTAINERS`` file.
 
-============  ================  ==============================================
-Architecture  Level of support  Constraints
-============  ================  ==============================================
-``um``        Maintained        ``x86_64`` only.
-``x86``       Maintained        ``x86_64`` only.
-============  ================  ==============================================
+=============  ================  ==============================================
+Architecture   Level of support  Constraints
+=============  ================  ==============================================
+``loongarch``  Maintained        -
+``um``         Maintained        ``x86_64`` only.
+``x86``        Maintained        ``x86_64`` only.
+=============  ================  ==============================================
 

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index ee123820a4760ad38296ecc3c94da8a06068b33c..6b9da3effdf8ef34577ec7dbbadf2159ff83bde0 100644 (file)
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -140,6 +140,7 @@ config LOONGARCH
        select HAVE_REGS_AND_STACK_ACCESS_API
        select HAVE_RETHOOK
        select HAVE_RSEQ
+       select HAVE_RUST
        select HAVE_SAMPLE_FTRACE_DIRECT
        select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
        select HAVE_SETUP_PER_CPU_AREA if NUMA

diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
index 4ba8d67ddb097743be4e68493604579142eee2d5..ba45cb7b621cdc1fb57e1d41dca591629e3ab55a 100644 (file)
--- a/arch/loongarch/Makefile
+++ b/arch/loongarch/Makefile
@@ -81,8 +81,11 @@ KBUILD_AFLAGS_MODULE         += -Wa,-mla-global-with-abs
 KBUILD_CFLAGS_MODULE           += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
 endif
 
+KBUILD_RUSTFLAGS_MODULE                += -Crelocation-model=pic
+
 ifeq ($(CONFIG_RELOCATABLE),y)
 KBUILD_CFLAGS_KERNEL           += -fPIE
+KBUILD_RUSTFLAGS_KERNEL                += -Crelocation-model=pie
 LDFLAGS_vmlinux                        += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs)
 endif
 

diff --git a/scripts/generate_rust_target.rs b/scripts/generate_rust_target.rs
index 3c6cbe2b278d302ebd6375e900dbe4875765805f..0da52b548ba50f5e1333c3c2b2a18da2533a18a1 100644 (file)
--- a/scripts/generate_rust_target.rs
+++ b/scripts/generate_rust_target.rs
@@ -161,6 +161,13 @@ fn main() {
         ts.push("features", features);
         ts.push("llvm-target", "x86_64-linux-gnu");
         ts.push("target-pointer-width", "64");
+    } else if cfg.has("LOONGARCH") {
+        ts.push("arch", "loongarch64");
+        ts.push("data-layout", "e-m:e-p:64:64-i64:64-i128:128-n64-S128");
+        ts.push("features", "-f,-d");
+        ts.push("llvm-target", "loongarch64-linux-gnusf");
+        ts.push("llvm-abiname", "lp64s");
+        ts.push("target-pointer-width", "64");
     } else {
         panic!("Unsupported architecture");
     }