Add Sony PlayStation 1 tier 3 target

compiler/rustc_target/src/spec/mipsel_sony_psx.rs

@@ -0,0 +1,37 @@
+use crate::spec::{cvs, Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "mipsel-sony-psx".into(),
+        pointer_width: 32,
+        data_layout: "e-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64".into(),
+        arch: "mips".into(),
+
+        options: TargetOptions {
+            os: "none".into(),
+            env: "psx".into(),
+            vendor: "sony".into(),
+            linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes),
+            cpu: "mips1".into(),
+            executables: true,
+            linker: Some("rust-lld".into()),
+            relocation_model: RelocModel::Static,
+            exe_suffix: ".exe".into(),
+
+            // PSX doesn't natively support floats.
+            features: "+soft-float".into(),
+
+            // This should be 16 bits, but LLVM incorrectly tries emitting MIPS-II SYNC instructions
+            // for atomic loads and stores. This crashes rustc so we have to disable the Atomic* API
+            // until this is fixed upstream. See https://reviews.llvm.org/D122427#3420144 for more
+            // info.
+            max_atomic_width: Some(0),
+
+            // PSX does not support trap-on-condition instructions.
+            llvm_args: cvs!["-mno-check-zero-division"],
+            llvm_abiname: "o32".into(),
+            panic_strategy: PanicStrategy::Abort,
+            ..Default::default()
+        },
+    }
+}

compiler/rustc_target/src/spec/mod.rs

@@ -1222,6 +1222,7 @@ supported_targets! {
     ("armv7a-kmc-solid_asp3-eabihf", armv7a_kmc_solid_asp3_eabihf),
 
     ("mipsel-sony-psp", mipsel_sony_psp),
+    ("mipsel-sony-psx", mipsel_sony_psx),
     ("mipsel-unknown-none", mipsel_unknown_none),
     ("thumbv4t-none-eabi", thumbv4t_none_eabi),
     ("armv4t-none-eabi", armv4t_none_eabi),