Detect MIPS R6

Cargo.toml

@@ -35,7 +35,7 @@ once_cell = { version = "1.5.2", optional = true }
 # addition to the libc backend. The linux_raw backend is used by default. The
 # libc backend can be selected via adding `--cfg=rustix_use_libc` to
 # `RUSTFLAGS` or enabling the `use-libc` cargo feature.
-[target.'cfg(all(not(rustix_use_libc), not(miri), target_os = "linux", target_endian = "little", any(target_arch = "arm", all(target_arch = "aarch64", target_pointer_width = "64"), target_arch = "riscv64", all(rustix_use_experimental_asm, target_arch = "powerpc64"), all(rustix_use_experimental_asm, target_arch = "mips"), all(rustix_use_experimental_asm, target_arch = "mips64"), target_arch = "x86", all(target_arch = "x86_64", target_pointer_width = "64"))))'.dependencies]
+[target.'cfg(all(not(rustix_use_libc), not(miri), target_os = "linux", target_endian = "little", any(target_arch = "arm", all(target_arch = "aarch64", target_pointer_width = "64"), target_arch = "riscv64", all(rustix_use_experimental_asm, target_arch = "powerpc64"), all(rustix_use_experimental_asm, target_arch = "mips"), all(rustix_use_experimental_asm, target_arch = "mips32r6"), all(rustix_use_experimental_asm, target_arch = "mips64"), all(rustix_use_experimental_asm, target_arch = "mips64r6"), target_arch = "x86", all(target_arch = "x86_64", target_pointer_width = "64"))))'.dependencies]
 linux-raw-sys = { version = "0.4.3", default-features = false, features = ["general", "errno", "ioctl", "no_std"] }
 libc_errno = { package = "errno", version = "0.3.1", default-features = false, optional = true }
 libc = { version = "0.2.147", features = ["extra_traits"], optional = true }
@@ -44,15 +44,15 @@ libc = { version = "0.2.147", features = ["extra_traits"], optional = true }
 #
 # On all other Unix-family platforms, and under Miri, we always use the libc
 # backend, so enable its dependencies unconditionally.
-[target.'cfg(all(not(windows), any(rustix_use_libc, miri, not(all(target_os = "linux", target_endian = "little", any(target_arch = "arm", all(target_arch = "aarch64", target_pointer_width = "64"), target_arch = "riscv64", all(rustix_use_experimental_asm, target_arch = "powerpc64"), all(rustix_use_experimental_asm, target_arch = "mips"), all(rustix_use_experimental_asm, target_arch = "mips64"), target_arch = "x86", all(target_arch = "x86_64", target_pointer_width = "64")))))))'.dependencies]
+[target.'cfg(all(not(windows), any(rustix_use_libc, miri, not(all(target_os = "linux", target_endian = "little", any(target_arch = "arm", all(target_arch = "aarch64", target_pointer_width = "64"), target_arch = "riscv64", all(rustix_use_experimental_asm, target_arch = "powerpc64"), all(rustix_use_experimental_asm, target_arch = "mips"), all(rustix_use_experimental_asm, target_arch = "mips32r6"), all(rustix_use_experimental_asm, target_arch = "mips64"), all(rustix_use_experimental_asm, target_arch = "mips64r6"), target_arch = "x86", all(target_arch = "x86_64", target_pointer_width = "64")))))))'.dependencies]
 libc_errno = { package = "errno", version = "0.3.1", default-features = false }
 libc = { version = "0.2.147", features = ["extra_traits"] }
 
 # Additional dependencies for Linux with the libc backend:
 #
 # Some syscalls do not have libc wrappers, such as in `io_uring`. For these,
 # the libc backend uses the linux-raw-sys ABI and `libc::syscall`.
-[target.'cfg(all(any(target_os = "android", target_os = "linux"), any(rustix_use_libc, miri, not(all(target_os = "linux", target_endian = "little", any(target_arch = "arm", all(target_arch = "aarch64", target_pointer_width = "64"), target_arch = "riscv64", all(rustix_use_experimental_asm, target_arch = "powerpc64"), all(rustix_use_experimental_asm, target_arch = "mips"), all(rustix_use_experimental_asm, target_arch = "mips64"), target_arch = "x86", all(target_arch = "x86_64", target_pointer_width = "64")))))))'.dependencies]
+[target.'cfg(all(any(target_os = "android", target_os = "linux"), any(rustix_use_libc, miri, not(all(target_os = "linux", target_endian = "little", any(target_arch = "arm", all(target_arch = "aarch64", target_pointer_width = "64"), target_arch = "riscv64", all(rustix_use_experimental_asm, target_arch = "powerpc64"), all(rustix_use_experimental_asm, target_arch = "mips"), all(rustix_use_experimental_asm, target_arch = "mips32r6"), all(rustix_use_experimental_asm, target_arch = "mips64"), all(rustix_use_experimental_asm, target_arch = "mips64r6"), target_arch = "x86", all(target_arch = "x86_64", target_pointer_width = "64")))))))'.dependencies]
 linux-raw-sys = { version = "0.4.3", default-features = false, features = ["general", "ioctl", "no_std"] }
 
 # For the libc backend on Windows, use the Winsock2 API in windows-sys.

build.rs

@@ -22,8 +22,8 @@ fn main() {
     let is_x32 = arch == "x86_64" && pointer_width == "32";
     let is_arm64_ilp32 = arch == "aarch64" && pointer_width == "32";
     let is_powerpc64be = arch == "powerpc64" && endian == "big";
-    let is_mipseb = arch == "mips" && endian == "big";
-    let is_mips64eb = arch == "mips64" && endian == "big";
+    let is_mipseb = (arch == "mips" || arch == "mips32r6") && endian == "big";
+    let is_mips64eb = arch.contains("mips64") && endian == "big";
     let is_unsupported_abi = is_x32 || is_arm64_ilp32 || is_powerpc64be || is_mipseb || is_mips64eb;
 
     // Check for `--features=use-libc`. This allows crate users to enable the
@@ -83,7 +83,7 @@ fn main() {
         || !inline_asm_name_present
         || is_unsupported_abi
         || miri
-        || ((arch == "powerpc64" || arch == "mips" || arch == "mips64")
+        || ((arch == "powerpc64" || arch == "mips" || arch == "mips64" || arch == "mips64r6")
             && !rustix_use_experimental_asm);
     if libc {
         // Use the libc backend.

src/backend/libc/c.rs

@@ -62,7 +62,9 @@ pub(crate) const ETH_P_MCTP: c_int = linux_raw_sys::if_ether::ETH_P_MCTP as _;
     linux_kernel,
     any(
         target_arch = "mips",
+        target_arch = "mips32r6",
         target_arch = "mips64",
+        target_arch = "mips64r6",
         target_arch = "sparc",
         target_arch = "sparc64"
     )
@@ -123,7 +125,14 @@ pub(super) use libc::{
     host_info64_t as host_info_t, host_statistics64 as host_statistics,
     vm_statistics64_t as vm_statistics_t,
 };
-#[cfg(not(all(linux_kernel, any(target_pointer_width = "32", target_arch = "mips64"))))]
+#[cfg(not(all(
+    linux_kernel,
+    any(
+        target_pointer_width = "32",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    )
+)))]
 #[cfg(any(linux_like, target_os = "aix"))]
 pub(super) use libc::{lstat64 as lstat, stat64 as stat};
 #[cfg(any(linux_kernel, target_os = "aix", target_os = "emscripten"))]

src/backend/libc/fs/syscalls.rs

@@ -536,7 +536,14 @@ pub(crate) fn symlinkat(
 
 pub(crate) fn stat(path: &CStr) -> io::Result<Stat> {
     // See the comments in `fstat` about using `crate::fs::statx` here.
-    #[cfg(all(linux_kernel, any(target_pointer_width = "32", target_arch = "mips64")))]
+    #[cfg(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    ))]
     {
         match crate::fs::statx(
             crate::fs::CWD,
@@ -552,7 +559,14 @@ pub(crate) fn stat(path: &CStr) -> io::Result<Stat> {
 
     // Main version: libc is y2038 safe. Or, the platform is not y2038 safe and
     // there's nothing practical we can do.
-    #[cfg(not(all(linux_kernel, any(target_pointer_width = "32", target_arch = "mips64"))))]
+    #[cfg(not(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    )))]
     unsafe {
         let mut stat = MaybeUninit::<Stat>::uninit();
         ret(c::stat(c_str(path), stat.as_mut_ptr()))?;
@@ -562,7 +576,14 @@ pub(crate) fn stat(path: &CStr) -> io::Result<Stat> {
 
 pub(crate) fn lstat(path: &CStr) -> io::Result<Stat> {
     // See the comments in `fstat` about using `crate::fs::statx` here.
-    #[cfg(all(linux_kernel, any(target_pointer_width = "32", target_arch = "mips64")))]
+    #[cfg(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    ))]
     {
         match crate::fs::statx(
             crate::fs::CWD,
@@ -578,7 +599,14 @@ pub(crate) fn lstat(path: &CStr) -> io::Result<Stat> {
 
     // Main version: libc is y2038 safe. Or, the platform is not y2038 safe and
     // there's nothing practical we can do.
-    #[cfg(not(all(linux_kernel, any(target_pointer_width = "32", target_arch = "mips64"))))]
+    #[cfg(not(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    )))]
     unsafe {
         let mut stat = MaybeUninit::<Stat>::uninit();
         ret(c::lstat(c_str(path), stat.as_mut_ptr()))?;
@@ -589,7 +617,14 @@ pub(crate) fn lstat(path: &CStr) -> io::Result<Stat> {
 #[cfg(not(any(target_os = "espidf", target_os = "redox")))]
 pub(crate) fn statat(dirfd: BorrowedFd<'_>, path: &CStr, flags: AtFlags) -> io::Result<Stat> {
     // See the comments in `fstat` about using `crate::fs::statx` here.
-    #[cfg(all(linux_kernel, any(target_pointer_width = "32", target_arch = "mips64")))]
+    #[cfg(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    ))]
     {
         match crate::fs::statx(dirfd, path, flags, StatxFlags::BASIC_STATS) {
             Ok(x) => statx_to_stat(x),
@@ -600,7 +635,14 @@ pub(crate) fn statat(dirfd: BorrowedFd<'_>, path: &CStr, flags: AtFlags) -> io::
 
     // Main version: libc is y2038 safe. Or, the platform is not y2038 safe and
     // there's nothing practical we can do.
-    #[cfg(not(all(linux_kernel, any(target_pointer_width = "32", target_arch = "mips64"))))]
+    #[cfg(not(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    )))]
     unsafe {
         let mut stat = MaybeUninit::<Stat>::uninit();
         ret(c::fstatat(
@@ -613,7 +655,14 @@ pub(crate) fn statat(dirfd: BorrowedFd<'_>, path: &CStr, flags: AtFlags) -> io::
     }
 }
 
-#[cfg(all(linux_kernel, any(target_pointer_width = "32", target_arch = "mips64")))]
+#[cfg(all(
+    linux_kernel,
+    any(
+        target_pointer_width = "32",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    )
+))]
 fn statat_old(dirfd: BorrowedFd<'_>, path: &CStr, flags: AtFlags) -> io::Result<Stat> {
     unsafe {
         let mut result = MaybeUninit::<c::stat64>::uninit();
@@ -1284,7 +1333,14 @@ pub(crate) fn fstat(fd: BorrowedFd<'_>) -> io::Result<Stat> {
     // And, some old platforms don't support `statx`, and some fail with a
     // confusing error code, so we call `crate::fs::statx` to handle that. If
     // `statx` isn't available, fall back to the buggy system call.
-    #[cfg(all(linux_kernel, any(target_pointer_width = "32", target_arch = "mips64")))]
+    #[cfg(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    ))]
     {
         match crate::fs::statx(fd, cstr!(""), AtFlags::EMPTY_PATH, StatxFlags::BASIC_STATS) {
             Ok(x) => statx_to_stat(x),
@@ -1295,15 +1351,29 @@ pub(crate) fn fstat(fd: BorrowedFd<'_>) -> io::Result<Stat> {
 
     // Main version: libc is y2038 safe. Or, the platform is not y2038 safe and
     // there's nothing practical we can do.
-    #[cfg(not(all(linux_kernel, any(target_pointer_width = "32", target_arch = "mips64"))))]
+    #[cfg(not(all(
+        linux_kernel,
+        any(
+            target_pointer_width = "32",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        )
+    )))]
     unsafe {
         let mut stat = MaybeUninit::<Stat>::uninit();
         ret(c::fstat(borrowed_fd(fd), stat.as_mut_ptr()))?;
         Ok(stat.assume_init())
     }
 }
 
-#[cfg(all(linux_kernel, any(target_pointer_width = "32", target_arch = "mips64")))]
+#[cfg(all(
+    linux_kernel,
+    any(
+        target_pointer_width = "32",
+        target_arch = "mips64",
+        target_arch = "mips64r6"
+    )
+))]
 fn fstat_old(fd: BorrowedFd<'_>) -> io::Result<Stat> {
     unsafe {
         let mut result = MaybeUninit::<c::stat64>::uninit();
@@ -1663,7 +1733,7 @@ fn statx_to_stat(x: crate::fs::Statx) -> io::Result<Stat> {
 /// Convert from a Linux `statx` value to rustix's `Stat`.
 ///
 /// mips64' `struct stat64` in libc has private fields, and `stx_blocks`
-#[cfg(all(linux_kernel, target_arch = "mips64"))]
+#[cfg(all(linux_kernel, any(target_arch = "mips64", target_arch = "mips64r6")))]
 fn statx_to_stat(x: crate::fs::Statx) -> io::Result<Stat> {
     let mut result: Stat = unsafe { core::mem::zeroed() };
 
@@ -1735,7 +1805,7 @@ fn stat64_to_stat(s64: c::stat64) -> io::Result<Stat> {
 ///
 /// mips64' `struct stat64` in libc has private fields, and `st_blocks` has
 /// type `i64`.
-#[cfg(all(linux_kernel, target_arch = "mips64"))]
+#[cfg(all(linux_kernel, any(target_arch = "mips64", target_arch = "mips64r6")))]
 fn stat64_to_stat(s64: c::stat64) -> io::Result<Stat> {
     let mut result: Stat = unsafe { core::mem::zeroed() };
 

src/backend/libc/mm/types.rs

@@ -201,7 +201,7 @@ bitflags! {
             target_os = "redox",
             all(
                 linux_kernel,
-                any(target_arch = "mips", target_arch = "mips64"),
+                any(target_arch = "mips", target_arch = "mips32r6", target_arch = "mips64", target_arch = "mips64r6"),
             )
         )))]
         const SYNC = bitcast!(c::MAP_SYNC);
@@ -333,7 +333,15 @@ pub enum Advice {
     #[cfg(linux_kernel)]
     LinuxHwPoison = bitcast!(c::MADV_HWPOISON),
     /// `MADV_SOFT_OFFLINE`
-    #[cfg(all(linux_kernel, not(any(target_arch = "mips", target_arch = "mips64"))))]
+    #[cfg(all(
+        linux_kernel,
+        not(any(
+            target_arch = "mips",
+            target_arch = "mips32r6",
+            target_arch = "mips64",
+            target_arch = "mips64r6"
+        ))
+    ))]
     LinuxSoftOffline = bitcast!(c::MADV_SOFT_OFFLINE),
     /// `MADV_MERGEABLE`
     #[cfg(linux_kernel)]

src/backend/libc/termios/syscalls.rs

@@ -115,7 +115,12 @@ pub(crate) fn tcsetattr(
         // Translate from `optional_actions` into an ioctl request code. On MIPS,
         // `optional_actions` already has `TCGETS` added to it.
         let request = TCSETS2
-            + if cfg!(any(target_arch = "mips", target_arch = "mips64")) {
+            + if cfg!(any(
+                target_arch = "mips",
+                target_arch = "mips32r6",
+                target_arch = "mips64",
+                target_arch = "mips64r6"
+            )) {
                 optional_actions as u32 - TCSETS
             } else {
                 optional_actions as u32