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The patch is fairly straightforward in its approach and consist of the following 3 logical changes: - abstract the number of floating-point register to clear in max_fp_regno - use max_fp_regno to decide how many registers to clear so that the same code works for Armv8-M and Armv8.1-M Mainline - emit vpush and vpop instruction respectively before and after a nonsecure call Note that as in the patch to clear GPRs inline, debug information has to be disabled for VPUSH and VPOP due to VPOP adding CFA adjustment note for SP when R7 is sometimes used as CFA. ChangeLog entries are as follows: *** 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 (vfp_emit_fstmd): Declare early. (arm_emit_vfp_multi_reg_pop): Likewise. (cmse_nonsecure_call_inline_register_clear): Abstract number of VFP registers to clear in max_fp_regno. Emit VPUSH and VPOP to save and restore callee-saved VFP registers. *** 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/mainline/8_1m/hard-sp/cmse-13.c: Add check for VPUSH and VPOP and update expectation for VSCCLRM. * gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-7.c: Likewise. * gcc.target/arm/cmse/mainline/8_1m/hard-sp/cmse-8.c: Likewise. * gcc.target/arm/cmse/mainline/8_1m/hard/cmse-13.c: Likewise. * gcc.target/arm/cmse/mainline/8_1m/hard/cmse-7.c: Likewise. * gcc.target/arm/cmse/mainline/8_1m/hard/cmse-8.c: Likewise.
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