Imported initArgv from libctru. Load __system_argc/__system_argv in crt0. Enabled the __system_argc/__system_argv code in fsdev.

crt0/switch_crt0.s

@@ -39,8 +39,10 @@ bss_loop:
     bl   __libnx_init
 
     // call entrypoint
-    mov  x0, #0 // argc
-    mov  x1, #0 // argv
+    adrp x0, __system_argc // argc
+    ldr  w0, [x0, #:lo12:__system_argc]
+    adrp x1, __system_argv // argv
+    ldr  x1, [x1, #:lo12:__system_argv]
     adrp x30, __libnx_exit
     add  x30, x30, #:lo12:__libnx_exit
     b    main

nx/source/devices/fs_dev.c

@@ -352,9 +352,9 @@ int fsdevUnmountDevice(const char *name)
 /*! Initialize SDMC device */
 Result fsdevInit(void)
 {
-  /*ssize_t  units;
+  ssize_t  units;
   uint32_t code;
-  char     *p;*/
+  char     *p;
   Result   rc = 0;
   FsFileSystem fs;
   fsdev_fsdevice *device = NULL;
@@ -390,8 +390,7 @@ Result fsdevInit(void)
         fsdev_fsdevice_cwd = fsdev_fsdevice_default;
       }
 
-      //TODO: Re-enable this once __system_argc/__system_argv are actually defined.
-      /*if(__system_argc != 0 && __system_argv[0] != NULL)
+      if(__system_argc != 0 && __system_argv[0] != NULL)
       {
         if(FindDevice(__system_argv[0]) == dev)
         {
@@ -426,7 +425,7 @@ Result fsdevInit(void)
             }
           }
         }
-      }*/
+      }
     }
   }
 

nx/source/system/init.c

@@ -5,6 +5,8 @@ void __nx_exit(int rc);
 void virtmemSetup();
 void newlibSetup(Handle main_thread);
 
+void __system_initArgv(void);
+
 #define INNER_HEAP_SIZE 0x200000
 __attribute__((weak)) size_t __nx_inner_heap_size = INNER_HEAP_SIZE;
 __attribute__((weak)) char   __nx_inner_heap[INNER_HEAP_SIZE];
@@ -59,6 +61,9 @@ void __attribute__((weak)) __libnx_init(Handle main_thread)
     virtmemSetup();
     _SetupHeap();
 
+    // Build argc/argv if present
+    __system_initArgv();
+
     // Initialize services.
     __appInit();
 

nx/source/system/initArgv.c

@@ -0,0 +1,57 @@
+#include <switch.h>
+
+#include <string.h>
+
+// System globals we define here
+int __system_argc;
+char** __system_argv;
+
+extern char* fake_heap_start;
+extern char* fake_heap_end;
+
+void __system_initArgv(void)
+{
+    //TODO: How to load args?
+    __system_argc = 0;
+    __system_argv = NULL;
+
+    /*
+    int i;
+    const char* arglist = envGetSystemArgList();
+    const char* temp = arglist;
+
+    // Check if the argument list is present
+    if (!temp)
+        return;
+
+    // Retrieve argc
+    __system_argc = *(u32*)temp;
+    temp += sizeof(u32);
+
+    // Find the end of the argument data
+    for (i = 0; i < __system_argc; i ++)
+    {
+        for (; *temp; temp ++);
+        temp ++;
+    }
+
+    // Reserve heap memory for argv data
+    u32 argSize = temp - arglist - sizeof(u32);
+    __system_argv = (char**)fake_heap_start;
+    fake_heap_start += sizeof(char**)*(__system_argc + 1);
+    char* argCopy = fake_heap_start;
+    fake_heap_start += argSize;
+
+    // Fill argv array
+    memcpy(argCopy, &arglist[4], argSize);
+    temp = argCopy;
+    for (i = 0; i < __system_argc; i ++)
+    {
+        __system_argv[i] = (char*)temp;
+        for (; *temp; temp ++);
+        temp ++;
+    }
+    __system_argv[__system_argc] = NULL;
+    */
+}
+