[PATCH 6/7, GCC, ARM, V8M] ARMv8-M Security Extension's cmse_nonsecure_call: use __gnu_cmse_nonsecure_call

["Andre Vieira (lists)" <Andre dot SimoesDiasVieira at arm dot com>]

This patch extends support for the ARMv8-M Security Extensions
'cmse_nonsecure_call' to use a new library function
'__gnu_cmse_nonsecure_call'. This library function is responsible for
(without using r0-r3 or d0-d7):
1) saving and clearing all callee-saved registers using the secure stack
2) clearing the LSB of the address passed in r4 and using blxns to
'jump' to it
3) clearing ASPR, including the 'ge bits' if DSP is enabled
4) clearing FPSCR if using non-soft float-abi
5) restoring callee-saved registers.

The decisions whether to include DSP 'ge bits' clearing and floating
point registers (single/double precision) all depends on the multilib used.

See Section 5.5 of ARM®v8-M Security Extensions
(http://infocenter.arm.com/help/topic/com.arm.doc.ecm0359818/index.html).

*** gcc/ChangeLog ***
2016-07-25  Andre Vieira        <andre.simoesdiasvieira@arm.com>
            Thomas Preud'homme  <thomas.preudhomme@arm.com>

        * config/arm/arm.c (detect_cmse_nonsecure_call): New.
        (cmse_nonsecure_call_clear_caller_saved): New.
        (arm_reorg): Use cmse_nonsecure_call_clear_caller_saved.
        * config/arm/arm-protos.h (detect_cmse_nonsecure_call): New.
        * config/arm/arm.md (call): Handle cmse_nonsecure_entry.
        (call_value): Likewise.
        (nonsecure_call_internal): New.
        (nonsecure_call_value_internal): New.
        * config/arm/thumb1.md (*nonsecure_call_reg_thumb1_v5): New.
        (*nonsecure_call_value_reg_thumb1_v5): New.
        * config/arm/thumb2.md (*nonsecure_call_reg_thumb2): New.
        (*nonsecure_call_value_reg_thumb2): New.
        * config/arm/unspecs.md (UNSPEC_NONSECURE_MEM): New.

*** libgcc/ChangeLog ***
2016-07-25  Andre Vieira        <andre.simoesdiasvieira@arm.com>
            Thomas Preud'homme  <thomas.preudhomme@arm.com>

        * config/arm/cmse_nonsecure_call.S: New.
	* config/arm/t-arm: Compile cmse_nonsecure_call.S


*** gcc/testsuite/ChangeLog ***
2016-07-25  Andre Vieira        <andre.simoesdiasvieira@arm.com>
            Thomas Preud'homme  <thomas.preudhomme@arm.com>

        * gcc.target/arm/cmse/cmse.exp: Run tests in mainline dir.
        * gcc.target/arm/cmse/cmse-9.c: Added some extra tests.
        * gcc.target/arm/cmse/baseline/bitfield-4.c: New.
        * gcc.target/arm/cmse/baseline/bitfield-5.c: New.
        * gcc.target/arm/cmse/baseline/bitfield-6.c: New.
        * gcc.target/arm/cmse/baseline/bitfield-7.c: New.
        * gcc.target/arm/cmse/baseline/bitfield-8.c: New.
        * gcc.target/arm/cmse/baseline/bitfield-9.c: New.
        * gcc.target/arm/cmse/baseline/bitfield-and-union-1.c: New.
        * gcc.target/arm/cmse/baseline/cmse-11.c: New.
	* gcc.target/arm/cmse/baseline/cmse-13.c: New.
	* gcc.target/arm/cmse/baseline/cmse-6.c: New.
        * gcc/testsuite/gcc.target/arm/cmse/baseline/union-1.c: New.
        * gcc/testsuite/gcc.target/arm/cmse/baseline/union-2.c: New.
	* gcc.target/arm/cmse/mainline/hard-sp/cmse-13.c: New.
	* gcc.target/arm/cmse/mainline/hard-sp/cmse-7.c: New.
	* gcc.target/arm/cmse/mainline/hard-sp/cmse-8.c: New.
	* gcc.target/arm/cmse/mainline/hard/cmse-13.c: New.
	* gcc.target/arm/cmse/mainline/hard/cmse-7.c: New.
	* gcc.target/arm/cmse/mainline/hard/cmse-8.c: New.
	* gcc.target/arm/cmse/mainline/soft/cmse-13.c: New.
	* gcc.target/arm/cmse/mainline/soft/cmse-7.c: New.
	* gcc.target/arm/cmse/mainline/soft/cmse-8.c: New.
	* gcc.target/arm/cmse/mainline/softfp-sp/cmse-7.c: New.
	* gcc.target/arm/cmse/mainline/softfp-sp/cmse-8.c: New.
	* gcc.target/arm/cmse/mainline/softfp/cmse-13.c: New.
	* gcc.target/arm/cmse/mainline/softfp/cmse-7.c: New.
	* gcc.target/arm/cmse/mainline/softfp/cmse-8.c: New.

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