From c0afabbb424dfe0c2ad5135853ad7f5b24f561b1 Mon Sep 17 00:00:00 2001
From: Petr Hosek <phosek@google.com>
Date: Thu, 2 Mar 2023 18:00:22 +0000
Subject: [PATCH] Support for Fuchsia RISC-V target

Fuchsia is in the process of implementing the RISC-V support. This
change implements the minimal Rust compiler support. The support for
building runtime libraries will be implemented in follow up changes
once Fuchsia SDK has the RISC-V support.
---
 compiler/rustc_target/src/spec/mod.rs         |  1 +
 .../src/spec/riscv64gc_unknown_fuchsia.rs     | 19 +++++++++++++++++++
 src/doc/rustc/src/platform-support.md         |  1 +
 3 files changed, 21 insertions(+)
 create mode 100644 compiler/rustc_target/src/spec/riscv64gc_unknown_fuchsia.rs

diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index 0d86a3032a6..f3304e91429 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -1115,6 +1115,7 @@ fn $module() {
     // FIXME(#106649): Remove aarch64-fuchsia in favor of aarch64-unknown-fuchsia
     ("aarch64-fuchsia", aarch64_fuchsia),
     ("aarch64-unknown-fuchsia", aarch64_unknown_fuchsia),
+    ("riscv64gc-unknown-fuchsia", riscv64gc_unknown_fuchsia),
     // FIXME(#106649): Remove x86_64-fuchsia in favor of x86_64-unknown-fuchsia
     ("x86_64-fuchsia", x86_64_fuchsia),
     ("x86_64-unknown-fuchsia", x86_64_unknown_fuchsia),
diff --git a/compiler/rustc_target/src/spec/riscv64gc_unknown_fuchsia.rs b/compiler/rustc_target/src/spec/riscv64gc_unknown_fuchsia.rs
new file mode 100644
index 00000000000..ab7c08958fa
--- /dev/null
+++ b/compiler/rustc_target/src/spec/riscv64gc_unknown_fuchsia.rs
@@ -0,0 +1,19 @@
+use crate::spec::{CodeModel, SanitizerSet, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "riscv64gc-unknown-fuchsia".into(),
+        pointer_width: 64,
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128".into(),
+        arch: "riscv64".into(),
+        options: TargetOptions {
+            code_model: Some(CodeModel::Medium),
+            cpu: "generic-rv64".into(),
+            features: "+m,+a,+f,+d,+c".into(),
+            llvm_abiname: "lp64d".into(),
+            max_atomic_width: Some(64),
+            supported_sanitizers: SanitizerSet::SHADOWCALLSTACK,
+            ..super::fuchsia_base::opts()
+        },
+    }
+}
diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
index 9eafa27e2b7..2d74a224096 100644
--- a/src/doc/rustc/src/platform-support.md
+++ b/src/doc/rustc/src/platform-support.md
@@ -295,6 +295,7 @@ target | std | host | notes
 [`riscv32imac-unknown-xous-elf`](platform-support/riscv32imac-unknown-xous-elf.md) | ? |  | RISC-V Xous (RV32IMAC ISA)
 `riscv32imc-esp-espidf` | ✓ |  | RISC-V ESP-IDF
 `riscv64gc-unknown-freebsd` |   |   | RISC-V FreeBSD
+`riscv64gc-unknown-fuchsia` |   |   | RISC-V Fuchsia
 `riscv64gc-unknown-linux-musl` |   |   | RISC-V Linux (kernel 4.20, musl 1.2.0)
 [`riscv64gc-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | OpenBSD/riscv64
 `s390x-unknown-linux-musl` |  |  | S390x Linux (kernel 3.2, MUSL)