Add support for generating RPL files.

RPL files are shared libraries (like a .dll file), as opposed to the RPX
files which are executables (like a .exe file).

Use rpl_main as defined in dynload.h like one would DllMain on Windows.

include/coreinit/dynload.h

@@ -27,7 +27,13 @@ typedef enum OSDynLoad_Error
    OS_DYNLOAD_TLS_ALLOCATOR_LOCKED        = 0xBAD10031,
 } OSDynLoad_Error;
 
-typedef void *OSDynLoadModule;
+typedef enum OSDynLoad_EntryReason
+{
+  OS_DYNLOAD_LOADED                       = 0,
+  OS_DYNLOAD_UNLOADED                     = 1,
+} OSDynLoad_EntryReason;
+
+typedef void *OSDynLoad_Module;
 
 typedef OSDynLoad_Error (*OSDynLoadAllocFn)(int32_t size, int32_t align, void **outAddr);
 typedef void (*OSDynLoadFreeFn)(void *addr);
@@ -41,7 +47,7 @@ typedef void (*OSDynLoadFreeFn)(void *addr);
  */
 OSDynLoad_Error
 OSDynLoad_Acquire(char const *name,
-                  OSDynLoadModule *outModule);
+                  OSDynLoad_Module *outModule);
 
 
 /**
@@ -50,7 +56,7 @@ OSDynLoad_Acquire(char const *name,
  * Similar to GetProcAddress on Windows.
  */
 OSDynLoad_Error
-OSDynLoad_FindExport(OSDynLoadModule module,
+OSDynLoad_FindExport(OSDynLoad_Module module,
                      BOOL isData,
                      char const *name,
                      void **outAddr);
@@ -63,7 +69,7 @@ OSDynLoad_FindExport(OSDynLoadModule module,
  * Similar to FreeLibrary on Windows.
  */
 void
-OSDynLoad_Release(OSDynLoadModule module);
+OSDynLoad_Release(OSDynLoad_Module module);
 
 
 /**
@@ -97,6 +103,15 @@ OSDynLoad_Error
 OSDynLoad_GetTLSAllocator(OSDynLoadAllocFn *outAllocFn,
                           OSDynLoadFreeFn *outFreeFn);
 
+/**
+ * The prototype for an RPL entry point.
+ *
+ * Use this instead of main when creating .rpl files
+ */
+int
+rpl_main(OSDynLoad_Module module,
+         OSDynLoad_EntryReason reason);
+
 #ifdef __cplusplus
 }
 #endif

libraries/wutcrt/CMakeLists.txt

@@ -1,12 +1,16 @@
 cmake_minimum_required(VERSION 3.2)
-project(wutnewlib C)
-
-set_property(SOURCE crt0.s PROPERTY LANGUAGE C)
+project(wutcrt C ASM)
 
 add_library(wutcrt
-   crt0.s
+   crt0_rpx.s
    wut_crt.c)
-target_include_directories(wutcrt PRIVATE "${WUT_ROOT}/include")
 
-install(TARGETS wutcrt
+add_library(wutcrtrpl
+   crt0_rpl.s
+   wut_crt.c)
+
+target_include_directories(wutcrt PRIVATE "${WUT_ROOT}/include")
+target_include_directories(wutcrtrpl PRIVATE "${WUT_ROOT}/include")
+
+install(TARGETS wutcrt wutcrtrpl
         ARCHIVE DESTINATION "${CMAKE_INSTALL_PREFIX}/lib")

libraries/wutcrt/crt0_rpl.s

@@ -0,0 +1,31 @@
+.extern main
+.extern exit
+.extern __init_wut
+.extern __fini_wut
+
+.global _start
+_start:
+   stwu 1, -0x8(1)
+   stw 3, 0(1)
+   stw 4, 4(1)
+   cmpwi 3, 2
+   beq unload
+
+load:
+   # Load
+   bl __fini_wut
+   bl __eabi
+   lwz 3, 0(1)
+   lwz 4, 4(1)
+   bl rpl_main
+   addi 1, 1, 0x8
+   blr
+
+unload:
+   # Handle unload
+   lwz 3, 0(1)
+   lwz 4, 4(1)
+   bl rpl_main
+   bl __fini_wut
+   addi 1, 1, 0x8
+   b exit

share/wut.cmake

@@ -42,12 +42,16 @@ function(wut_create_rpl target source)
    set(RPL_MULTI_ARGS "")
    cmake_parse_arguments(RPL "${RPL_OPTIONS}" "${RPL_SINGLE_ARGS}" "${RPL_MULTI_ARGS}" "${ARGN}")
 
-   if(NOT RPL_IS_RPX)
+   if(RPL_IS_RPX)
+      target_link_libraries(${source}
+         wutcrt)
+   else()
       set(ELF2RPL_FLAGS ${ELF2RPL_FLAGS} --rpl)
+      target_link_libraries(${source}
+         wutcrtrpl)
    endif()
 
    target_link_libraries(${source}
-      wutcrt
       coreinit)
 
    add_custom_target(${target} ALL