implement SuperH4 support, building with custom stdlib (libc)

CMakeLists.txt

@@ -24,11 +24,15 @@ set(SOURCES
     heap.c
 )
 
-set(ARCHITECTURE "ARMv7" CACHE STRING "cutil target architecture")
+set(ARCHITECTURE "SuperH4" CACHE STRING "cutil target architecture")
+
 set(ARM_PROCESSOR "cortex-m4" CACHE STRING "cutil ARM processor")
 set(ARM_PROFILE "a" CACHE STRING "cutil ARM architecture profile")
 
 if ("${ARCHITECTURE}" MATCHES "ARM*")
+    set(CUSTOM_STDLIB "" CACHE STRING "custom stdlib path")
+    add_compile_definitions(ARM_PROCESSOR="${ARM_PROCESSOR}")
+    add_compile_definitions(ARM_PROFILE="${ARM_PROFILE}")
     if ("${ARM_PROFILE}" STREQUAL "m")
         add_compile_options("-mcpu=${ARM_PROCESSOR}")
         add_compile_options("-mthumb")
@@ -38,20 +42,28 @@ if ("${ARCHITECTURE}" MATCHES "ARM*")
         add_compile_options("-march=${COMPILE_ARCHITECTURE}-${ARM_PROFILE}")
         add_compile_options("-marm")
     endif()
+elseif("${ARCHITECTURE}" MATCHES "SuperH4")
+    set(CUSTOM_STDLIB "/opt/sh4-platform/lib" CACHE STRING "custom stdlib path")
+    add_compile_options("-m4")
 endif()
 
-add_compile_definitions(ARM_PROCESSOR="${ARM_PROCESSOR}")
-add_compile_definitions(ARM_PROFILE="${ARM_PROFILE}")
-
 add_library(cutil STATIC ${SOURCES} ${HEADERS}
     "arch/${ARCHITECTURE}.S"
 )
 
 option(NOSTDLIB "compile cutil without stdlib" ON)
+option(STATIC "compile test static" OFF)
 if (NOSTDLIB)
     target_compile_definitions(cutil PRIVATE CUTIL_NOSTDLIB)
     target_compile_options(cutil PRIVATE "-nostdlib")
 endif()
 
+if(NOT "${CUSTOM_STDLIB}" STREQUAL "")
+    add_compile_options("-nostdlib")
+    set(CMAKE_EXE_LINKER_FLAGS "-L${CUSTOM_STDLIB} -l:libc.so.6")
+elseif (STATIC)
+    add_link_options(-static)    
+endif()
+
 add_executable(test test.c)
-target_link_libraries(test -static cutil)
+target_link_libraries(test cutil)

arch/SuperH4.S

@@ -0,0 +1,47 @@
+.globl hw_bswap16
+.globl hw_bswap32
+.globl hw_bswap64
+.globl _cu_memcpy
+.globl _cu_memmove
+.globl _cu_memcmp
+.globl _cu_memset
+.globl cu_memzero
+.globl cu_memtest
+.globl cu_va_start
+.globl cu_va_arg
+
+.text
+.align 16
+
+hw_bswap16:
+    rts
+
+hw_bswap32:
+    rts
+
+hw_bswap64:
+    rts
+
+_cu_memcpy:
+    rts
+
+_cu_memmove:
+    rts
+
+_cu_memcmp:
+    rts
+
+_cu_memset:
+    rts
+
+cu_memzero:
+    rts
+
+cu_memtest:
+    rts
+
+cu_va_start:
+    rts
+
+cu_va_arg:
+    rts

va_list.h

@@ -21,6 +21,10 @@ typedef struct {
 typedef struct {
     uword fp;
 } cu_va_list;
+#elif (defined(CU_ARCH_SUPERH))
+typedef struct {
+    uword fp;
+} cu_va_list;
 #endif
 
 extern void cu_va_start(cu_va_list* va);