Auto merge of #3204 - ComputerDruid:riscv64, r=JohnTitor

fuchsia: add definitions for riscv64

src/fuchsia/aarch64.rs

@@ -62,5 +62,6 @@ s! {
     }
 }
 
+// From https://cs.opensource.google/fuchsia/fuchsia/+/main:zircon/third_party/ulib/musl/include/bits/signal.h;l=20-21;drc=0827b18ab9540c46f8037f407d17ea15a79e9ba7
 pub const MINSIGSTKSZ: ::size_t = 6144;
 pub const SIGSTKSZ: ::size_t = 12288;

src/fuchsia/mod.rs

@@ -4260,6 +4260,9 @@ cfg_if! {
     } else if #[cfg(any(target_arch = "x86_64"))] {
         mod x86_64;
         pub use self::x86_64::*;
+    } else if #[cfg(any(target_arch = "riscv64"))] {
+        mod riscv64;
+        pub use self::riscv64::*;
     } else {
         // Unknown target_arch
     }

src/fuchsia/riscv64.rs

@@ -0,0 +1,44 @@
+// From psABI Calling Convention for RV64
+pub type c_char = u8;
+pub type __u64 = ::c_ulonglong;
+pub type wchar_t = i32;
+
+pub type nlink_t = ::c_ulong;
+pub type blksize_t = ::c_long;
+
+pub type stat64 = stat;
+s! {
+    pub struct stat {
+        pub st_dev: ::dev_t,
+        pub st_ino: ::ino_t,
+        pub st_nlink: ::nlink_t,
+        pub st_mode: ::mode_t,
+        pub st_uid: ::uid_t,
+        pub st_gid: ::gid_t,
+        __pad0: ::c_int,
+        pub st_rdev: ::dev_t,
+        pub st_size: ::off_t,
+        pub st_blksize: ::blksize_t,
+        pub st_blocks: ::blkcnt_t,
+        pub st_atime: ::time_t,
+        pub st_atime_nsec: ::c_long,
+        pub st_mtime: ::time_t,
+        pub st_mtime_nsec: ::c_long,
+        pub st_ctime: ::time_t,
+        pub st_ctime_nsec: ::c_long,
+        __unused: [::c_long; 3],
+    }
+
+    // Not actually used, IPC calls just return ENOSYS
+    pub struct ipc_perm {
+        pub __ipc_perm_key: ::key_t,
+        pub uid: ::uid_t,
+        pub gid: ::gid_t,
+        pub cuid: ::uid_t,
+        pub cgid: ::gid_t,
+        pub mode: ::mode_t,
+        pub __seq: ::c_ushort,
+        __unused1: ::c_ulong,
+        __unused2: ::c_ulong,
+    }
+}