Some userspace online doc

userspace/libc.c

@@ -42,12 +42,13 @@ void *memcpy(void *dst0, const void *src0, size_t len0)
 #else
     char *dst       = dst0;
     const char *src = src0;
-    long *aligned_dst;
-    const long *aligned_src;
 
     /* If the size is small, or either SRC or DST is unaligned,
        then punt into the byte copy loop.  This should be rare.  */
     if (!TOO_SMALL(len0) && !UNALIGNED(src, dst)) {
+        long *aligned_dst;
+        const long *aligned_src;
+
         aligned_dst = (long *)dst;
         aligned_src = (long *)src;
 

userspace/main_user.c

@@ -5,11 +5,11 @@
 int func_help()
 {
         printf("\nAvailable Commands:\n");
-        printf("        suicide\n");
+        printf("        help: this help\n");
-        printf("        help\n");
+        printf("        suicide: userspace self kill\n");
-        printf("        syscall5\n");
+        printf("        syscall5: a syscall with parameters over the stack \n");
-        printf("        alloc\n");
+        printf("        alloc: test allocation\n");
-        printf("        tiny: a tiny C interpreter\n");
+        printf("        tiny: a tiny C-like interpreter\n");
         return 0;
 }
 
@@ -21,7 +21,7 @@ int func_suicide()
         return 0;
 }
 
-void *initialHeap = 0;
+char *initialHeap = 0;
 int func_alloc()
 {
 
@@ -30,7 +30,7 @@ int func_alloc()
         }
         printf("Testing allocation\n");
         int allocSize    = 4096 * 2;
-        void *currentHeap = brk(0);
+        char *currentHeap = brk(0);
         if (currentHeap - initialHeap < allocSize) {
                 brk(initialHeap + allocSize);
         }

userspace/tiny.c

@@ -284,6 +284,7 @@ void run()
 
 int func_tiny()
 {
+    printf("Enter your program then ESC\n\n");
     printf("TinyC grammar\n");
     printf("<program> ::= <statement>\n");
     printf("<statement> ::= \"if\" <paren_expr> <statement> |\n");