From f6441a2e6f901748b504ef93872649c9463a404e Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Sun, 15 Mar 2026 16:07:39 +0800
Subject: initial commit: project architecture

---
 rv64cpu/tools/toolchain-riscv64.cmake | 36 +++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 rv64cpu/tools/toolchain-riscv64.cmake

(limited to 'rv64cpu/tools/toolchain-riscv64.cmake')

diff --git a/rv64cpu/tools/toolchain-riscv64.cmake b/rv64cpu/tools/toolchain-riscv64.cmake
new file mode 100644
index 0000000..c177fda
--- /dev/null
+++ b/rv64cpu/tools/toolchain-riscv64.cmake
@@ -0,0 +1,36 @@
+# ─── RISC-V 64 Bare-Metal Toolchain File ─────────────────────────────────────────
+#
+# Usage: cmake -B build_sw -DCMAKE_TOOLCHAIN_FILE=tools/toolchain-riscv64.cmake
+#
+
+set(CMAKE_SYSTEM_NAME      Generic)
+set(CMAKE_SYSTEM_PROCESSOR riscv64)
+
+# ─── Toolchain binaries ─────────────────────────────────────────────────────────
+set(CROSS_PREFIX "riscv64-unknown-elf-" CACHE STRING "Cross compiler prefix")
+
+set(CMAKE_C_COMPILER       ${CROSS_PREFIX}gcc)
+set(CMAKE_CXX_COMPILER     ${CROSS_PREFIX}g++)
+set(CMAKE_ASM_COMPILER     ${CROSS_PREFIX}gcc)
+set(CMAKE_OBJCOPY          ${CROSS_PREFIX}objcopy)
+set(CMAKE_OBJDUMP          ${CROSS_PREFIX}objdump)
+set(CMAKE_SIZE             ${CROSS_PREFIX}size)
+
+# ─── Architecture flags ─────────────────────────────────────────────────────────
+set(RISCV_ARCH  "rv64ima"   CACHE STRING "RISC-V ISA string")
+set(RISCV_ABI   "lp64"     CACHE STRING "RISC-V ABI")
+
+set(CMAKE_C_FLAGS_INIT     "-march=${RISCV_ARCH} -mabi=${RISCV_ABI} -nostdlib -ffreestanding -fno-builtin -mcmodel=medany")
+set(CMAKE_CXX_FLAGS_INIT   "${CMAKE_C_FLAGS_INIT} -fno-exceptions -fno-rtti")
+set(CMAKE_ASM_FLAGS_INIT   "-march=${RISCV_ARCH} -mabi=${RISCV_ABI}")
+
+set(CMAKE_EXE_LINKER_FLAGS_INIT "-nostartfiles -static -Wl,--gc-sections")
+
+# ─── Search paths ───────────────────────────────────────────────────────────────
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM  NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY  ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE  ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE  ONLY)
+
+# ─── Disable compiler checks (bare-metal can't run test binaries) ────────────────
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
-- 
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