--- a/packages/hal/arm/arch/current/ChangeLog
+++ b/packages/hal/arm/arch/current/ChangeLog
@@ -1,3 +1,9 @@
+2014-03-14  John Dallaway  <john@dallaway.org.uk>
+
+	* src/mcount.S: Add mcount functions for call-graph profiling.
+	* cdl/hal_arm.cdl: Add option to build mcount functions.
+	[ Bugzilla 1001959 ]
+
 2011-11-23  Nick Garnett  <nickg@ecoscentric.com>
 
 	* cdl/hal_arm.cdl: Add CDL to control whether both IRQs and FIQs
@@ -1823,7 +1829,7 @@ 1998-10-16  Bart Veer  <bartv@cygnus.co.
 // ####GPLCOPYRIGHTBEGIN####                                                
 // -------------------------------------------                              
 // This file is part of eCos, the Embedded Configurable Operating System.   
-// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2009 Free Software Foundation, Inc.
+// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2009, 2014 Free Software Foundation, Inc.
 //
 // This program is free software; you can redistribute it and/or modify     
 // it under the terms of the GNU General Public License as published by     

--- a/packages/hal/arm/arch/current/cdl/hal_arm.cdl
+++ b/packages/hal/arm/arch/current/cdl/hal_arm.cdl
@@ -8,7 +8,7 @@
 ## ####ECOSGPLCOPYRIGHTBEGIN####                                            
 ## -------------------------------------------                              
 ## This file is part of eCos, the Embedded Configurable Operating System.   
-## Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+## Copyright (C) 1998, 1999, 2000, 2001, 2002, 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     
@@ -41,7 +41,7 @@
 #
 # Author(s):      bartv
 # Original data:  gthomas
-# Contributors:
+# Contributors:   jld
 # Date:           1999-06-13
 #
 #####DESCRIPTIONEND####
@@ -59,6 +59,8 @@ cdl_package CYGPKG_HAL_ARM {
         necessary to select a specific target platform HAL
         package."
 
+    implements    CYGINT_PROFILE_HAL_MCOUNT
+
     compile       hal_misc.c context.S arm_stub.c hal_syscall.c
 
     # The "-o file" is a workaround for CR100958 - without it the
@@ -382,6 +384,19 @@ cdl_package CYGPKG_HAL_ARM {
 
     }
 
+    cdl_option CYGBLD_HAL_ARM_MCOUNT {
+        display           "Support call-graph profiling"
+        flavor            bool
+        no_define
+        active_if         CYGPKG_PROFILE_GPROF
+        calculated        CYGPKG_PROFILE_CALLGRAPH
+        requires          { CYGHWR_THUMB implies CYGBLD_ARM_ENABLE_THUMB_INTERWORK }
+        compile           mcount.S
+        description       "
+            Calculate whether mcount functions should be built
+            to support call-graph profiling."
+    }
+
     cdl_option CYGBLD_LINKER_SCRIPT {
         display "Linker script"
         flavor data

new file mode 100644
--- /dev/null
+++ b/packages/hal/arm/arch/current/src/mcount.S
@@ -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