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Re: VFPv3 and FLDMD unwind support for ARM, revised version

On Wed, 2006-12-13 at 16:07 +0000, Mark Shinwell wrote:
> This patch is a revised version of one posted some time ago.  It adds
> support for VFPv3 in the unwinder and also uses FSTMD instead of FSTMX
> instructions for saving VFP registers in the frame (as per a request
> from Richard Earnshaw).  Unlike the previous patch it always uses
> FSTMD/FLDMD instead of the X variants.
> Tested on arm-none-eabi with no regressions.  OK for mainline?
> Mark
> --
> 2006-12-13  Mark Shinwell  <>
> 	gcc/
> 	* config/arm/arm.c (arm_output_fldmx): Output FLDMD instead of
> 	(vfp_output_fstmx): Output FSTMD instead of FSTMX.
> 	(vfp_emit_fstmx): Don't leave space in the frame layout for the
> 	FSTMX format word.
> 	(arm_get_vfp_saved_size): Don't add in space for the FSTMX format
> 	word.
> 	(arm_output_epilogue): Adjust comment to reflect use of FSTMD.
> 	(arm_unwind_emit_sequence): Don't compensate for the FSTMX format
> 	word.  Also emit "vsave" assembler directives in such cases rather
> 	than "save".
> 	* config/arm/libunwind.S (gnu_Unwind_Restore_VFP,
> 	gnu_Unwind_Save_VFP): Adjust comments.
> 	(gnu_Unwind_Restore_VFP_D, gnu_Unwind_Save_VFP_D): New functions
> 	for saving and restoring using FSTMD and FLDMD rather than
> 	(gnu_Unwind_Restore_VFP_D_16_to_31, gnu_Unwind_Restore_VFP_D_16_to_31):
> 	New functions for saving and restoring the VFPv3 registers 16 .. 31.
> 	* config/arm/pr-support.c (gnu_unwind_execute): Add conditional
> 	compilation case to correctly handle unwind opcode 0xc8 when using
> 	VFP.
> 	* config/arm/unwind-arm.c (struct vfpv3_regs): New.
> 	(__gnu_Unwind_Save_VFP_D, __gnu_Unwind_Restore_VFP_D,
> 	__gnu_Unwind_Save_VFP_D_16_to_31, __gnu_Unwind_Restore_VFP_D_16_to_31):
> 	Declare.
> 	(restore_non_core_regs): Restore registers using FLDMD rather than
> 	FLDMX if required.  Also handle restoration of VFPv3 registers.
> 	(_Unwind_VRS_Pop): Handle saving and restoring of registers using
> 	FSTMD and FLDMD if required; also handle VFPv3 registers 16 .. 31,
> 	including cases where the caller specifies a range of registers
> 	that overlaps the d15/d16 boundary.



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