From 5955f54a4d606de1ba23dfbdca160de98b859717 Mon Sep 17 00:00:00 2001
From: gabriel <gabriel@minres.com>
Date: Mon, 26 Feb 2024 20:41:13 +0100
Subject: [PATCH] first semihosting integration

---
 .gitignore                      |  3 ++
 semihosting_test/CMakeLists.txt | 85 +++++++++++++++++++++++++++++++++
 semihosting_test/test.c         | 14 ++++++
 3 files changed, 102 insertions(+)
 create mode 100644 semihosting_test/CMakeLists.txt
 create mode 100644 semihosting_test/test.c

diff --git a/.gitignore b/.gitignore
index c6c7f67..ab6b6b6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -151,3 +151,6 @@ compile_commands.json
 CTestTestfile.cmake
 *.dump
 
+.vscode/c_cpp_properties.json
+semihosting_test/build/semihosting_test
+semihosting_test/build/Makefile
diff --git a/semihosting_test/CMakeLists.txt b/semihosting_test/CMakeLists.txt
new file mode 100644
index 0000000..0395857
--- /dev/null
+++ b/semihosting_test/CMakeLists.txt
@@ -0,0 +1,85 @@
+CMAKE_MINIMUM_REQUIRED(VERSION 3.13 FATAL_ERROR)
+
+
+
+SET(BOARD "iss" CACHE STRING "board to be compiled for")
+
+SET(RISCV_ARCH "rv32imc" CACHE STRING "arch")
+SET(RISCV_ABI "ilp32" CACHE STRING "abi")
+
+EXECUTE_PROCESS(    
+    COMMAND which riscv64-unknown-elf-gcc
+    OUTPUT_VARIABLE COMPILER
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+GET_FILENAME_COMPONENT(TOOL_DIR ${COMPILER} DIRECTORY)
+
+SET(TRIPLET "riscv64-unknown-elf")
+
+SET(CMAKE_C_COMPILER ${TOOL_DIR}/${TRIPLET}-gcc)
+SET(CMAKE_CXX_COMPILER ${TOOL_DIR}/${TRIPLET}-g++)
+SET(CMAKE_ASM_COMPILER ${TOOL_DIR}/${TRIPLET}-gcc)
+SET(CMAKE_LINKER ${TOOL_DIR}/${TRIPLET}-ld)
+SET(CMAKE_OBJCOPY ${TOOL_DIR}/${TRIPLET}-objcopy)
+SET(CMAKE_AR ${TOOL_DIR}/${TRIPLET}-ar)
+
+PROJECT(semihosting_test)
+
+SET(BSP_BASE "../bare-metal-bsp")
+SET(ENV_DIR ${BSP_BASE}/env)
+SET(PLATFORM_DIR ${ENV_DIR}/${BOARD})
+
+SET(SEMIHOSTING TRUE)
+
+INCLUDE(${BSP_BASE}/libwrap/CMakeLists.txt)
+
+INCLUDE_DIRECTORIES(
+    ${BSP_BASE}/include
+    ${BSP_BASE}/drivers
+    ${BSP_BASE}/libwrap/semihosting
+    ${ENV_DIR}
+    ${PLATFORM_DIR})
+
+
+# Source files
+SET(ASM_SRCS
+    ${ENV_DIR}/entry.S
+    ${ENV_DIR}/start.S
+)
+SET(C_SRCS
+    ${PLATFORM_DIR}/init.c
+    test.c
+)
+SET_SOURCE_FILES_PROPERTIES(${ASM_SRCS} PROPERTIES LANGUAGE C)
+
+# Compiler Flags
+SET(COMMON_FLAGS "")
+
+# GCC Version Check
+EXECUTE_PROCESS(
+    COMMAND ${CMAKE_C_COMPILER} --version
+    OUTPUT_VARIABLE GCC_VERSION
+)
+IF(GCC_VERSION MATCHES "9.2")
+    LIST(APPEND COMMON_FLAGS "-march=${RISCV_ARCH}")
+ELSE()
+    LIST(APPEND COMMON_FLAGS "-march=${RISCV_ARCH}_zicsr_zifencei")
+ENDIF()
+LIST(APPEND COMMON_FLAGS "-mabi=${RISCV_ABI}" "-mcmodel=medany" "-DBOARD_${BOARD}")
+
+# Compiler Options
+ADD_COMPILE_OPTIONS("${COMMON_FLAGS}")
+
+ADD_EXECUTABLE(${PROJECT_NAME} ${ASM_SRCS} ${C_SRCS} ${SRC_FILES})
+
+TARGET_LINK_LIBRARIES(${PROJECT_NAME} PUBLIC ${LIBWRAP_TGC_LDFLAGS} LIBWRAP_TGC)
+
+# Linker Flags
+TARGET_LINK_LIBRARIES(${PROJECT_NAME}
+    PUBLIC
+        -march=${RISCV_ARCH} -mabi=${RISCV_ABI}
+        -T/scratch/gabriel/repos/Firmwares/bare-metal-bsp/env/iss/link.lds
+        -Wl,-Map=${PROJECT_NAME}.map
+        -nostartfiles
+        -L${ENV_DIR}
+)
diff --git a/semihosting_test/test.c b/semihosting_test/test.c
new file mode 100644
index 0000000..a0fcebf
--- /dev/null
+++ b/semihosting_test/test.c
@@ -0,0 +1,14 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "platform.h"
+#include "encoding.h"
+#include "semihosting.h"
+
+int main()
+{
+	char c = sh_readc();
+	printf(c);
+	return 0;
+}