Rollup merge of rust-lang#66899 - msizanoen1:riscv-std, r=alexcrichton

Standard library support for riscv64gc-unknown-linux-gnu

Add std support for RISC-V 64-bit GNU/Linux and update libc for RISC-V support.

r? @alexcrichton

Cargo.lock

@@ -1823,9 +1823,9 @@ checksum = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
 
 [[package]]
 name = "libc"
-version = "0.2.64"
+version = "0.2.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74dfca3d9957906e8d1e6a0b641dc9a59848e793f1da2165889fd4f62d10d79c"
+checksum = "d515b1f41455adea1313a4a2ac8a8a477634fbae63cc6100e3aebb207ce61558"
 dependencies = [
  "rustc-std-workspace-core",
 ]

src/libpanic_unwind/gcc.rs

@@ -129,6 +129,9 @@ const UNWIND_DATA_REG: (i32, i32) = (24, 25); // I0, I1
 #[cfg(target_arch = "hexagon")]
 const UNWIND_DATA_REG: (i32, i32) = (0, 1); // R0, R1
 
+#[cfg(target_arch = "riscv64")]
+const UNWIND_DATA_REG: (i32, i32) = (10, 11); // x10, x11
+
 // The following code is based on GCC's C and C++ personality routines.  For reference, see:
 // https://github.com/gcc-mirror/gcc/blob/master/libstdc++-v3/libsupc++/eh_personality.cc
 // https://github.com/gcc-mirror/gcc/blob/trunk/libgcc/unwind-c.c

src/libstd/env.rs

@@ -1033,6 +1033,11 @@ mod arch {
     pub const ARCH: &'static str = "hexagon";
 }
 
+#[cfg(target_arch = "riscv64")]
+mod arch {
+    pub const ARCH: &'static str = "riscv64";
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/libstd/os/linux/raw.rs

@@ -230,7 +230,12 @@ mod arch {
     }
 }
 
-#[cfg(any(target_arch = "mips64", target_arch = "s390x", target_arch = "sparc64"))]
+#[cfg(any(
+    target_arch = "mips64",
+    target_arch = "s390x",
+    target_arch = "sparc64",
+    target_arch = "riscv64"
+))]
 mod arch {
     pub use libc::{blkcnt_t, blksize_t, ino_t, nlink_t, off_t, stat, time_t};
 }

src/libstd/os/raw/mod.rs

@@ -18,7 +18,8 @@
             target_arch = "hexagon",
             target_arch = "powerpc",
             target_arch = "powerpc64",
-            target_arch = "s390x"
+            target_arch = "s390x",
+            target_arch = "riscv64"
         )
     ),
     all(target_os = "android", any(target_arch = "aarch64", target_arch = "arm")),
@@ -60,7 +61,8 @@ pub type c_char = u8;
             target_arch = "hexagon",
             target_arch = "powerpc",
             target_arch = "powerpc64",
-            target_arch = "s390x"
+            target_arch = "s390x",
+            target_arch = "riscv64"
         )
     ),
     all(target_os = "android", any(target_arch = "aarch64", target_arch = "arm")),

src/libstd/sys/unix/fs.rs

@@ -57,6 +57,7 @@ macro_rules! cfg_has_statx {
                 // target_arch = "mips64",
                 // target_arch = "s390x",
                 target_arch = "sparc64",
+                target_arch = "riscv64",
             )))] {
                 $($then_tt)*
             } else {
@@ -76,6 +77,7 @@ macro_rules! cfg_has_statx {
             // target_arch = "mips64",
             // target_arch = "s390x",
             target_arch = "sparc64",
+            target_arch = "riscv64",
         )))]
         {
             $($block_inner)*

src/libstd/sys_common/alloc.rs

@@ -22,7 +22,8 @@ pub const MIN_ALIGN: usize = 8;
     target_arch = "aarch64",
     target_arch = "mips64",
     target_arch = "s390x",
-    target_arch = "sparc64"
+    target_arch = "sparc64",
+    target_arch = "riscv64"
 )))]
 pub const MIN_ALIGN: usize = 16;
 

src/libunwind/libunwind.rs

@@ -53,6 +53,9 @@ pub const unwinder_private_data_size: usize = 2;
 #[cfg(target_arch = "sparc64")]
 pub const unwinder_private_data_size: usize = 2;
 
+#[cfg(target_arch = "riscv64")]
+pub const unwinder_private_data_size: usize = 2;
+
 #[cfg(target_os = "emscripten")]
 pub const unwinder_private_data_size: usize = 20;