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@@ -0,0 +1,140 @@
+/*==========================================================================
+//
+//      mcount.S
+//
+//      ARM mcount implementation
+//
+//==========================================================================
+// ####ECOSGPLCOPYRIGHTBEGIN####                                            
+// -------------------------------------------                              
+// This file is part of eCos, the Embedded Configurable Operating System.   
+// Copyright (C) 2014 Free Software Foundation, Inc.                        
+//
+// eCos is free software; you can redistribute it and/or modify it under    
+// the terms of the GNU General Public License as published by the Free     
+// Software Foundation; either version 2 or (at your option) any later      
+// version.                                                                 
+//
+// eCos is distributed in the hope that it will be useful, but WITHOUT      
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or    
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License    
+// for more details.                                                        
+//
+// You should have received a copy of the GNU General Public License        
+// along with eCos; if not, write to the Free Software Foundation, Inc.,    
+// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            
+//
+// As a special exception, if other files instantiate templates or use      
+// macros or inline functions from this file, or you compile this file      
+// and link it with other works to produce a work based on this file,       
+// this file does not by itself cause the resulting work to be covered by   
+// the GNU General Public License. However the source code for this file    
+// must still be made available in accordance with section (3) of the GNU   
+// General Public License v2.                                               
+//
+// This exception does not invalidate any other reasons why a work based    
+// on this file might be covered by the GNU General Public License.         
+// -------------------------------------------                              
+// ####ECOSGPLCOPYRIGHTEND####                                              
+//==========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):       jld
+// Contributor(s):  
+// Date:            2014-03-14
+// Description:     This file provides mcount functions used for
+//                  call-graph profiling.
+//
+//####DESCRIPTIONEND####
+//
+//========================================================================
+*/
+
+#include "arm.inc"
+
+/*
+// GCC inserts mcount code at the start of every function when compiling
+// with "-pg". For GCC prior to version 4.4 targeting ARM, the following
+// code is inserted:
+// 
+//   mov r12, lr
+//   bl mcount
+//   .word <data pointer>
+//
+// For GCC version 4.4 and later targeting ARM, the following code is
+// inserted:
+//
+//   push { lr }
+//   bl __gnu_mcount_nc
+//
+// We provide implementations of both mcount() and __gnu_mcount_nc() to
+// call the eCos __profile_mcount() function.
+*/
+
+        .syntax unified
+        .arm
+        .globl mcount
+        .section .text.mcount
+        .type mcount, %function
+mcount:
+        // resume execution beyond the data pointer on return to caller
+        add lr, lr, #4
+
+        // caller assumes r0-r3 will be preserved (non-AAPCS), we use
+        // r6 and must preserve lr across our __profile_mcount() call
+        push { r0, r1, r2, r3, r6, lr }
+
+        // set up parameters for __profile_mcount()
+        sub r0, r12, #2
+        bic r0, r0, #1
+        bic r1, lr, #1
+
+        // disable interrupts
+        mrs r6, cpsr
+        orr r2, r6, #CPSR_INTR_MASK
+        msr cpsr, r2
+
+        // call eCos __profile_mcount()
+        // r6 is preserved across the call per AAPCS
+        bl __profile_mcount
+
+        // restore interrupts
+        msr cpsr, r6
+
+        // restore registers and return
+        pop { r0, r1, r2, r3, r6, r12 }
+        bx r12
+
+
+        .globl __gnu_mcount_nc
+        .section .text.__gnu_mcount_nc
+        .type __gnu_mcount_nc, %function
+__gnu_mcount_nc:
+        // caller assumes r0-r3 will be preserved (non-AAPCS), we use
+        // r6 and must preserve lr across our __profile_mcount() call
+        push { r0, r1, r2, r3, r6, lr }
+
+        // set up parameters for __profile_mcount()
+        ldr r0, [ sp, #24 ]
+        sub r0, r0, #2
+        bic r0, r0, #1
+        bic r1, lr, #1
+
+        // disable interrupts
+        mrs r6, cpsr
+        orr r2, r6, #CPSR_INTR_MASK
+        msr cpsr, r2
+
+        // call eCos __profile_mcount()
+        // r6 is preserved across the call per AAPCS
+        bl __profile_mcount
+
+        // restore interrupts
+        msr cpsr, r6
+
+        // restore registers and return
+        pop { r0, r1, r2, r3, r6, r12, lr }
+        bx r12
+
+//==========================================================================
+// end of mcount.S