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[PATCH, GCC/ARM, 3/10] Save/restore FPCXTNS in nsentry functions · e0e4be48This patch consists mainly of creating 2 new instruction patterns to push and pop special FP registers via vldm and vstr and using them in prologue and epilogue. The patterns are defined as push/pop with an unspecified operation on the memory accessed, with an unspecified constant indicating what special FP register is being saved/restored. Other aspects of the patch include: * defining the set of special registers that can be saved/restored and their name * reserving space in the stack frames for these push/pop * preventing return via pop * guarding the clearing of FPSCR to target architecture not having Armv8.1-M Mainline instructions. *** gcc/ChangeLog *** 2020-01-16 Mihail-Calin Ionescu <mihail.ionescu@arm.com> 2020-01-16 Thomas Preud'homme <thomas.preudhomme@arm.com> * config/arm/arm.c (fp_sysreg_names): Declare and define. (use_return_insn): Also return false for Armv8.1-M Mainline. (output_return_instruction): Skip FPSCR clearing if Armv8.1-M Mainline instructions are available. (arm_compute_frame_layout): Allocate space in frame for FPCXTNS when targeting Armv8.1-M Mainline Security Extensions. (arm_expand_prologue): Save FPCXTNS if this is an Armv8.1-M Mainline entry function. (cmse_nonsecure_entry_clear_before_return): Clear IP and r4 if targeting Armv8.1-M Mainline or successor. (arm_expand_epilogue): Fix indentation of caller-saved register clearing. Restore FPCXTNS if this is an Armv8.1-M Mainline entry function. * config/arm/arm.h (TARGET_HAVE_FP_CMSE): New macro. (FP_SYSREGS): Likewise. (enum vfp_sysregs_encoding): Define enum. (fp_sysreg_names): Declare. * config/arm/unspecs.md (VUNSPEC_VSTR_VLDR): New volatile unspec. * config/arm/vfp.md (push_fpsysreg_insn): New define_insn. (pop_fpsysreg_insn): Likewise. *** gcc/testsuite/Changelog *** 2020-01-16 Mihail-Calin Ionescu <mihail.ionescu@arm.com> 2020-01-16 Thomas Preud'homme <thomas.preudhomme@arm.com> * gcc.target/arm/cmse/bitfield-1.c: add checks for VSTR and VLDR. * gcc.target/arm/cmse/bitfield-2.c: Likewise. * gcc.target/arm/cmse/bitfield-3.c: Likewise. * gcc.target/arm/cmse/cmse-1.c: Likewise. * gcc.target/arm/cmse/struct-1.c: Likewise. * gcc.target/arm/cmse/cmse.exp: Run existing Armv8-M Mainline tests from mainline/8m subdirectory and new Armv8.1-M Mainline tests from mainline/8_1m subdirectory. * gcc.target/arm/cmse/mainline/bitfield-4.c: Move into ... * gcc.target/arm/cmse/mainline/8m/bitfield-4.c: This. * gcc.target/arm/cmse/mainline/bitfield-5.c: Move into ... * gcc.target/arm/cmse/mainline/8m/bitfield-5.c: This. * gcc.target/arm/cmse/mainline/bitfield-6.c: Move into ... * gcc.target/arm/cmse/mainline/8m/bitfield-6.c: This. * gcc.target/arm/cmse/mainline/bitfield-7.c: Move into ... * gcc.target/arm/cmse/mainline/8m/bitfield-7.c: This. * gcc.target/arm/cmse/mainline/bitfield-8.c: Move into ... * gcc.target/arm/cmse/mainline/8m/bitfield-8.c: This. * gcc.target/arm/cmse/mainline/bitfield-9.c: Move into ... * gcc.target/arm/cmse/mainline/8m/bitfield-9.c: This. * gcc.target/arm/cmse/mainline/bitfield-and-union-1.c: Move and rename into ... * gcc.target/arm/cmse/mainline/8m/bitfield-and-union.c: This. * gcc.target/arm/cmse/mainline/hard-sp/cmse-13.c: Move into ... * gcc.target/arm/cmse/mainline/8m/hard-sp/cmse-13.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/hard-sp/cmse-5.c: Move into ... * gcc.target/arm/cmse/mainline/8m/hard-sp/cmse-5.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/hard-sp/cmse-7.c: Move into ... * gcc.target/arm/cmse/mainline/8m/hard-sp/cmse-7.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/hard-sp/cmse-8.c: Move into ... * gcc.target/arm/cmse/mainline/8m/hard-sp/cmse-8.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/hard/cmse-13.c: Move into ... * gcc.target/arm/cmse/mainline/8m/hard/cmse-13.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/hard/cmse-5.c: Move into ... * gcc.target/arm/cmse/mainline/8m/hard/cmse-5.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/hard/cmse-7.c: Move into ... * gcc.target/arm/cmse/mainline/8m/hard/cmse-7.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/hard/cmse-8.c: Move into ... * gcc.target/arm/cmse/mainline/8m/hard/cmse-8.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/soft/cmse-13.c: Move into ... * gcc.target/arm/cmse/mainline/8m/soft/cmse-13.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/soft/cmse-5.c: Move into ... * gcc.target/arm/cmse/mainline/8m/soft/cmse-5.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/soft/cmse-7.c: Move into ... * gcc.target/arm/cmse/mainline/8m/soft/cmse-7.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/soft/cmse-8.c: Move into ... * gcc.target/arm/cmse/mainline/8m/soft/cmse-8.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/softfp-sp/cmse-5.c: Move into ... * gcc.target/arm/cmse/mainline/8m/softfp-sp/cmse-5.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/softfp-sp/cmse-7.c: Move into ... * gcc.target/arm/cmse/mainline/8m/softfp-sp/cmse-7.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/softfp-sp/cmse-8.c: Move into ... * gcc.target/arm/cmse/mainline/8m/softfp-sp/cmse-8.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/softfp/cmse-13.c: Move into ... * gcc.target/arm/cmse/mainline/8m/softfp/cmse-13.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/softfp/cmse-5.c: Move into ... * gcc.target/arm/cmse/mainline/8m/softfp/cmse-5.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/softfp/cmse-7.c: Move into ... * gcc.target/arm/cmse/mainline/8m/softfp/cmse-7.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/softfp/cmse-8.c: Move into ... * gcc.target/arm/cmse/mainline/8m/softfp/cmse-8.c: This. Clean up dg-skip-if directive for float ABI. * gcc.target/arm/cmse/mainline/union-1.c: Move into ... * gcc.target/arm/cmse/mainline/8m/union-1.c: This. * gcc.target/arm/cmse/mainline/union-2.c: Move into ... * gcc.target/arm/cmse/mainline/8m/union-2.c: This. * gcc.target/arm/cmse/mainline/8_1m/bitfield-4.c: New file. * gcc.target/arm/cmse/mainline/8_1m/bitfield-5.c: New file. * gcc.target/arm/cmse/mainline/8_1m/bitfield-6.c: New file. * gcc.target/arm/cmse/mainline/8_1m/bitfield-7.c: New file. * gcc.target/arm/cmse/mainline/8_1m/bitfield-8.c: New file. * gcc.target/arm/cmse/mainline/8_1m/bitfield-9.c: New file. * gcc.target/arm/cmse/mainline/8_1m/bitfield-and-union.c: New file. * gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-13.c: New file. * gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-5.c: New file. * gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-7.c: New file. * gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-8.c: New file. * gcc.target/arm/cmse/mainline/8_1m/hard/cmse-13.c: New file. * gcc.target/arm/cmse/mainline/8_1m/hard/cmse-5.c: New file. * gcc.target/arm/cmse/mainline/8_1m/hard/cmse-7.c: New file. * gcc.target/arm/cmse/mainline/8_1m/hard/cmse-8.c: New file. * gcc.target/arm/cmse/mainline/8_1m/soft/cmse-13.c: New file. * gcc.target/arm/cmse/mainline/8_1m/soft/cmse-5.c: New file. * gcc.target/arm/cmse/mainline/8_1m/soft/cmse-7.c: New file. * gcc.target/arm/cmse/mainline/8_1m/soft/cmse-8.c: New file. * gcc.target/arm/cmse/mainline/8_1m/softfp-sp/cmse-5.c: New file. * gcc.target/arm/cmse/mainline/8_1m/softfp-sp/cmse-7.c: New file. * gcc.target/arm/cmse/mainline/8_1m/softfp-sp/cmse-8.c: New file. * gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-13.c: New file. * gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-5.c: New file. * gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-7.c: New file. * gcc.target/arm/cmse/mainline/8_1m/softfp/cmse-8.c: New file. * gcc.target/arm/cmse/mainline/8_1m/union-1.c: New file. * gcc.target/arm/cmse/mainline/8_1m/union-2.c: New file. * lib/target-supports.exp (check_effective_target_arm_cmse_clear_ok): New procedure.Mihail Ionescu committed
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