add ARM11

ports/arm11/gnu/example_build/crt0.S

@@ -0,0 +1,90 @@
+
+/* .text is used instead of .section .text so it works with arm-aout too.  */
+    .text
+    .code 32
+    .align  0
+
+    .global _mainCRTStartup
+    .global _start
+    .global start
+start:
+_start:
+_mainCRTStartup:
+
+/* Start by setting up a stack */
+    /*  Set up the stack pointer to a fixed value */
+    ldr r3, .LC0
+    mov     sp, r3
+    /* Setup a default stack-limit in case the code has been
+       compiled with "-mapcs-stack-check".  Hard-wiring this value
+       is not ideal, since there is currently no support for
+       checking that the heap and stack have not collided, or that
+       this default 64k is enough for the program being executed.
+       However, it ensures that this simple crt0 world will not
+       immediately cause an overflow event:  */
+    sub sl, sp, #64 << 10   /* Still assumes 256bytes below sl */
+    mov     a2, #0          /* Second arg: fill value */
+    mov fp, a2          /* Null frame pointer */
+    mov r7, a2          /* Null frame pointer for Thumb */
+    
+    ldr a1, .LC1        /* First arg: start of memory block */
+    ldr a3, .LC2    
+    sub a3, a3, a1      /* Third arg: length of block */
+    
+
+    
+        bl      memset
+    mov r0, #0      /*  no arguments  */
+    mov r1, #0      /*  no argv either */
+#ifdef __USES_INITFINI__
+    /* Some arm/elf targets use the .init and .fini sections
+       to create constructors and destructors, and for these
+       targets we need to call the _init function and arrange
+       for _fini to be called at program exit.  */
+    mov r4, r0
+    mov r5, r1
+/*        ldr     r0, .Lfini */
+        bl      atexit
+/*        bl      init */
+    mov r0, r4
+    mov r1, r5
+#endif  
+        bl      main
+
+        bl      exit         /* Should not return.  */
+
+    
+    /* For Thumb, constants must be after the code since only 
+       positive offsets are supported for PC relative addresses.  */
+    
+    .align 0
+.LC0:
+.LC1:
+    .word   __bss_start__
+.LC2:
+    .word   __bss_end__
+/*
+#ifdef __USES_INITFINI__
+.Lfini:
+    .word   _fini
+#endif  */
+    /* Return ...  */
+#ifdef __APCS_26__
+    movs    pc, lr
+#else
+#ifdef __THUMB_INTERWORK
+    bx  lr
+#else
+    mov pc, lr
+#endif
+#endif
+
+
+/*  Workspace for Angel calls.  */
+    .data
+/*  Data returned by monitor SWI.  */
+.global __stack_base__
+HeapBase:   .word   0
+HeapLimit:  .word   0
+__stack_base__: .word   0
+StackLimit: .word   0