Fixed the issue of the data/bss section cannot be read from ARM FVP d… (#301)

* Fixed the issue of the data/bss section cannot be read from ARM FVP debug tool in cortex-A7 GNU port.

https://msazure.visualstudio.com/One/_workitems/edit/24597276/

* remove untracked files.

Author: yajunxiaMS

ports/cortex_a12/gnu/example_build/crt0.S

@@ -79,6 +79,14 @@ _mainCRTStartup:
 #endif
 #endif
 
+    .global  _fini
+    .type    _fini,function
+_fini:
+#ifdef __THUMB_INTERWORK
+    BX      lr                                  // Return to caller
+#else
+    MOV     pc, lr                              // Return to caller
+#endif
 
 /*  Workspace for Angel calls.  */
     .data

ports/cortex_a12/gnu/example_build/sample_threadx.ld

@@ -109,7 +109,7 @@ SECTIONS
   .eh_frame_hdr : { *(.eh_frame_hdr) }
   /* Adjust the address for the data segment.  We want to adjust up to
      the same address within the page on the next page up.  */
-  . = ALIGN(256) + (. & (256 - 1));
+  . = 0x2E000000;
   .data    :
   {
     *(.data)

ports/cortex_a12/gnu/example_build/v7.h

@@ -0,0 +1,155 @@
+// ------------------------------------------------------------
+// v7-A Cache, TLB and Branch Prediction Maintenance Operations
+// Header File
+//
+// Copyright (c) 2011-2016 Arm Limited (or its affiliates). All rights reserved.
+// Use, modification and redistribution of this file is subject to your possession of a
+// valid End User License Agreement for the Arm Product of which these examples are part of 
+// and your compliance with all applicable terms and conditions of such licence agreement.
+// ------------------------------------------------------------
+
+#ifndef _ARMV7A_GENERIC_H
+#define _ARMV7A_GENERIC_H
+
+// ------------------------------------------------------------
+// Memory barrier mnemonics
+enum MemBarOpt {
+  RESERVED_0  = 0,  RESERVED_1 = 1, OSHST = 2, OSH = 3,
+  RESERVED_4  = 4,  RESERVED_5 = 5, NSHST = 6, NSH = 7,
+  RESERVED_8  = 8,  RESERVED_9 = 9, ISHST = 10, ISH = 11,
+  RESERVED_12 = 12, RESERVED_13 = 13, ST = 14, SY = 15
+};
+
+//
+// Note:
+// *_IS() stands for "inner shareable"
+// DO NOT USE THESE FUNCTIONS ON A CORTEX-A8
+//
+
+// ------------------------------------------------------------
+// Interrupts
+// Enable/disables IRQs (not FIQs)
+void enableInterrupts(void);
+void disableInterrupts(void);
+
+// ------------------------------------------------------------
+// Caches
+
+void invalidateCaches_IS(void);
+void cleanInvalidateDCache(void);
+void invalidateCaches_IS(void);
+void enableCaches(void);
+void disableCaches(void);
+void invalidateCaches(void);
+void cleanDCache(void);
+
+// ------------------------------------------------------------
+// TLBs
+
+void invalidateUnifiedTLB(void);
+void invalidateUnifiedTLB_IS(void);
+
+// ------------------------------------------------------------
+// Branch prediction
+
+void flushBranchTargetCache(void);
+void flushBranchTargetCache_IS(void);
+
+// ------------------------------------------------------------
+// High Vecs
+
+void enableHighVecs(void);
+void disableHighVecs(void);
+
+// ------------------------------------------------------------
+// ID Registers
+
+unsigned int getMIDR(void);
+
+#define MIDR_IMPL_SHIFT  24
+#define MIDR_IMPL_MASK   0xFF
+#define MIDR_VAR_SHIFT   20
+#define MIDR_VAR_MASK    0xF
+#define MIDR_ARCH_SHIFT  16
+#define MIDR_ARCH_MASK   0xF
+#define MIDR_PART_SHIFT  4
+#define MIDR_PART_MASK   0xFFF
+#define MIDR_REV_SHIFT   0
+#define MIDR_REV_MASK    0xF
+
+// tmp = get_MIDR();
+// implementor = (tmp >> MIDR_IMPL_SHIFT) & MIDR_IMPL_MASK;
+// variant     = (tmp >> MIDR_VAR_SHIFT)  & MIDR_VAR_MASK;
+// architecture= (tmp >> MIDR_ARCH_SHIFT) & MIDR_ARCH_MASK;
+// part_number = (tmp >> MIDR_PART_SHIFT) & MIDR_PART_MASK;
+// revision    = tmp & MIDR_REV_MASK;
+
+#define MIDR_PART_CA5    0xC05
+#define MIDR_PART_CA8    0xC08
+#define MIDR_PART_CA9    0xC09
+
+unsigned int getMPIDR(void);
+
+#define MPIDR_FORMAT_SHIFT  31
+#define MPIDR_FORMAT_MASK   0x1
+#define MPIDR_UBIT_SHIFT    30
+#define MPIDR_UBIT_MASK     0x1
+#define MPIDR_CLUSTER_SHIFT 7
+#define MPIDR_CLUSTER_MASK  0xF
+#define MPIDR_CPUID_SHIFT   0
+#define MPIDR_CPUID_MASK    0x3
+
+#define MPIDR_CPUID_CPU0    0x0
+#define MPIDR_CPUID_CPU1    0x1
+#define MPIDR_CPUID_CPU2    0x2
+#define MPIDR_CPUID_CPU3    0x3
+
+#define MPIDR_UNIPROCESSPR  0x1
+
+#define MPDIR_NEW_FORMAT    0x1
+
+// ------------------------------------------------------------
+// Context ID
+
+unsigned int getContextID(void);
+
+void setContextID(unsigned int);
+
+#define CONTEXTID_ASID_SHIFT   0
+#define CONTEXTID_ASID_MASK    0xFF
+#define CONTEXTID_PROCID_SHIFT 8
+#define CONTEXTID_PROCID_MASK  0x00FFFFFF
+
+// tmp    = getContextID();
+// ASID   = tmp & CONTEXTID_ASID_MASK;
+// PROCID = (tmp >> CONTEXTID_PROCID_SHIFT) & CONTEXTID_PROCID_MASK;
+
+// ------------------------------------------------------------
+// SMP related for Armv7-A MPCore processors
+//
+// DO NOT CALL THESE FUNCTIONS ON A CORTEX-A8
+
+// Returns the base address of the private peripheral memory space
+unsigned int getBaseAddr(void);
+
+// Returns the CPU ID (0 to 3) of the CPU executed on
+#define MP_CPU0   (0)
+#define MP_CPU1   (1)
+#define MP_CPU2   (2)
+#define MP_CPU3   (3)
+unsigned int getCPUID(void);
+
+// Set this core as participating in SMP
+void joinSMP(void);
+
+// Set this core as NOT participating in SMP
+void leaveSMP(void);
+
+// Go to sleep, never returns
+void goToSleep(void);
+
+#endif
+
+// ------------------------------------------------------------
+// End of v7.h
+// ------------------------------------------------------------