diff --git a/pkgs/build-support/rust/build-rust-package/default.nix b/pkgs/build-support/rust/build-rust-package/default.nix
index 40b7a6181232..d2f90be8240c 100644
--- a/pkgs/build-support/rust/build-rust-package/default.nix
+++ b/pkgs/build-support/rust/build-rust-package/default.nix
@@ -151,23 +151,10 @@ stdenv.mkDerivation ((removeAttrs args [ "depsExtraArgs" "cargoUpdateHook" "carg
   strictDeps = true;
 
   meta = meta // {
-    badPlatforms = meta.badPlatforms or [] ++ [
-      # Rust is currently unable to target the n32 ABI
-      lib.systems.inspect.patterns.isMips64n32
-    ];
-  } // lib.optionalAttrs (rustc.meta ? platforms) {
+    badPlatforms = meta.badPlatforms or [] ++ rustc.badTargetPlatforms;
     # default to Rust's platforms
     platforms = lib.intersectLists
       meta.platforms or lib.platforms.all
-      (rustc.meta.platforms ++ [
-        # Platforms without host tools from
-        # https://doc.rust-lang.org/nightly/rustc/platform-support.html
-        "armv7a-darwin"
-        "armv5tel-linux" "armv7a-linux" "m68k-linux" "mips-linux"
-        "mips64-linux" "mipsel-linux" "mips64el-linux" "riscv32-linux"
-        "armv6l-netbsd" "mipsel-netbsd" "riscv64-netbsd"
-        "x86_64-redox"
-        "wasm32-wasi"
-      ]);
+      rustc.targetPlatforms;
   };
 })
diff --git a/pkgs/build-support/rust/rustc-wrapper/default.nix b/pkgs/build-support/rust/rustc-wrapper/default.nix
index 0defa6355029..0b16740ae5bb 100644
--- a/pkgs/build-support/rust/rustc-wrapper/default.nix
+++ b/pkgs/build-support/rust/rustc-wrapper/default.nix
@@ -30,7 +30,9 @@ runCommand "${rustc-unwrapped.pname}-wrapper-${rustc-unwrapped.version}" {
   };
 
   passthru = {
-    inherit (rustc-unwrapped) pname version src llvm llvmPackages;
+    inherit (rustc-unwrapped)
+      pname version src llvm llvmPackages
+      tier1TargetPlatforms targetPlatforms badTargetPlatforms;
     unwrapped = rustc-unwrapped;
   };
 
diff --git a/pkgs/development/compilers/rust/binary.nix b/pkgs/development/compilers/rust/binary.nix
index 10e944515df7..f972a932f308 100644
--- a/pkgs/development/compilers/rust/binary.nix
+++ b/pkgs/development/compilers/rust/binary.nix
@@ -61,6 +61,37 @@ rec {
     dontStrip = true;
 
     setupHooks = ./setup-hook.sh;
+
+    passthru = rec {
+      tier1TargetPlatforms = [
+        # Platforms with host tools from
+        # https://doc.rust-lang.org/nightly/rustc/platform-support.html
+        "x86_64-darwin" "i686-darwin" "aarch64-darwin"
+        "i686-freebsd" "x86_64-freebsd"
+        "x86_64-solaris"
+        "aarch64-linux" "armv6l-linux" "armv7l-linux" "i686-linux"
+        "loongarch64-linux" "powerpc64-linux" "powerpc64le-linux"
+        "riscv64-linux" "s390x-linux" "x86_64-linux"
+        "aarch64-netbsd" "armv7l-netbsd" "i686-netbsd" "powerpc-netbsd"
+        "x86_64-netbsd"
+        "i686-openbsd" "x86_64-openbsd"
+        "i686-windows" "x86_64-windows"
+      ];
+      targetPlatforms = tier1TargetPlatforms ++ [
+        # Platforms without host tools from
+        # https://doc.rust-lang.org/nightly/rustc/platform-support.html
+        "armv7a-darwin"
+        "armv5tel-linux" "armv7a-linux" "m68k-linux" "mips-linux"
+        "mips64-linux" "mipsel-linux" "mips64el-linux" "riscv32-linux"
+        "armv6l-netbsd" "mipsel-netbsd" "riscv64-netbsd"
+        "x86_64-redox"
+        "wasm32-wasi"
+      ];
+      badTargetPlatforms = [
+        # Rust is currently unable to target the n32 ABI
+        lib.systems.inspect.patterns.isMips64n32
+      ];
+    };
   };
 
   rustc = wrapRustc rustc-unwrapped;
diff --git a/pkgs/development/compilers/rust/rustc.nix b/pkgs/development/compilers/rust/rustc.nix
index 509f255fda78..9fcc2ca923fb 100644
--- a/pkgs/development/compilers/rust/rustc.nix
+++ b/pkgs/development/compilers/rust/rustc.nix
@@ -303,6 +303,7 @@ in stdenv.mkDerivation (finalAttrs: {
   passthru = {
     llvm = llvmShared;
     inherit llvmPackages;
+    inherit (rustc) tier1TargetPlatforms targetPlatforms badTargetPlatforms;
     tests = {
       inherit fd ripgrep wezterm;
     } // lib.optionalAttrs stdenv.hostPlatform.isLinux { inherit firefox thunderbird; };
@@ -313,19 +314,9 @@ in stdenv.mkDerivation (finalAttrs: {
     description = "Safe, concurrent, practical language";
     maintainers = with maintainers; [ havvy ] ++ teams.rust.members;
     license = [ licenses.mit licenses.asl20 ];
-    platforms = [
-      # Platforms with host tools from
-      # https://doc.rust-lang.org/nightly/rustc/platform-support.html
-      "x86_64-darwin" "i686-darwin" "aarch64-darwin"
-      "i686-freebsd" "x86_64-freebsd"
-      "x86_64-solaris"
-      "aarch64-linux" "armv6l-linux" "armv7l-linux" "i686-linux"
-      "loongarch64-linux" "powerpc64-linux" "powerpc64le-linux"
-      "riscv64-linux" "s390x-linux" "x86_64-linux"
-      "aarch64-netbsd" "armv7l-netbsd" "i686-netbsd" "powerpc-netbsd"
-      "x86_64-netbsd"
-      "i686-openbsd" "x86_64-openbsd"
-      "i686-windows" "x86_64-windows"
-    ];
+    platforms = rustc.tier1TargetPlatforms;
+    # If rustc can't target a platform, we also can't build rustc for
+    # that platform.
+    badPlatforms = rustc.badTargetPlatforms;
   };
 })