Re: [PATCH 3/7, GCC, ARM, V8M] ARMv8-M Security Extension's cmse_nonsecure_entry: __acle_se label and bxns return

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

On 25/07/16 14:23, Andre Vieira (lists) wrote:
> This patch extends support for the ARMv8-M Security Extensions
> 'cmse_nonsecure_entry' attribute in two ways:
> 
> 1) Generate two labels for the function, the regular function name and
> one with the function's name appended to '__acle_se_', this will trigger
> the linker to create a secure gateway veneer for this entry function.
> 2) Return from cmse_nonsecure_entry marked functions using bxns.
> 
> See Section 5.4 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 (use_return_insn): Change to return with  bxns
>         when cmse_nonsecure_entry.
>         (output_return_instruction): Likewise.
>         (arm_output_function_prologue): Likewise.
>         (thumb_pop): Likewise.
>         (thumb_exit): Likewise.
>         (arm_function_ok_for_sibcall): Disable sibcall for entry functions.
>         (arm_asm_declare_function_name): New.
>         * config/arm/arm-protos.h (arm_asm_declare_function_name): New.
>         * config/arm/elf.h (ASM_DECLARE_FUNCTION_NAME): Redefine to
>         use arm_asm_declare_function_name.
> 
> *** gcc/testsuite/ChangeLog ***
> 2016-07-25  Andre Vieira        <andre.simoesdiasvieira@arm.com>
>             Thomas Preud'homme  <thomas.preudhomme@arm.com>
> 
>         * gcc.target/arm/cmse/cmse-2.c: New.
>         * gcc.target/arm/cmse/cmse-4.c: New.
> 
Hi,

Rebased previous patch on top of trunk as requested. No changes to
ChangeLog.

Cheers,
Andre

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