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arm: Add support for Arm Cortex-M85 CPU.
This patch adds the -mcpu support for the Arm Cortex-M85 CPU which is an Armv8.1-M Mainline CPU supporting MVE and PACBTI by default. -mpcu=cortex-m85 switch by default matches to -march=armv8.1-m.main+pacbti+mve.fp+fp.dp. Also following options are provided to disable default features. +nomve.fp (disables MVE Floating point) +nomve (disables MVE Integer and MVE Floating point) +nodsp (disables dsp, MVE Integer and MVE Floating point) +nopacbti (disables pacbti) +nofp (disables floating point and MVE floating point) gcc/ChangeLog: 2022-08-12 Srinath Parvathaneni <[email protected]> * config/arm/arm-cpus.in (cortex-m85): Define new CPU. * config/arm/arm-tables.opt: Regenerate. * config/arm/arm-tune.md: Likewise. * doc/invoke.texi (Arm Options): Document -mcpu=cortex-m85. * (-mfix-cmse-cve-2021-35465): Likewise. gcc/testsuite/ChangeLog: 2022-08-12 Srinath Parvathaneni <[email protected]> * gcc.target/arm/multilib.exp: Add tests for cortex-m85. (cherry picked from commit gcc-mirror@ccfd1e7) Signed-off-by: Thao Luong <[email protected]>
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‎gcc/config/arm/arm-cpus.in‎

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@@ -1638,6 +1638,21 @@ begin cpu cortex-m55
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vendor 41
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end cpu cortex-m55
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begin cpu cortex-m85
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cname cortexm85
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tune flags LDSCHED
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architecture armv8.1-m.main+pacbti+mve.fp+fp.dp
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option nopacbti remove pacbti
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option nomve.fp remove mve_float
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option nomve remove mve mve_float
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option nofp remove ALL_FP mve_float
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option nodsp remove MVE mve_float
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isa quirk_no_asmcpu quirk_vlldm
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costs v7m
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part 0xd23
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vendor 41
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end cpu cortex-m85
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# V8 R-profile implementations.
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begin cpu cortex-r52
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cname cortexr52

‎gcc/config/arm/arm-tables.opt‎

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@@ -285,6 +285,9 @@ Enum(processor_type) String(cortex-m55) Value( TARGET_CPU_cortexm55)
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EnumValue
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Enum(processor_type) String(cortex-r52) Value( TARGET_CPU_cortexr52)
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EnumValue
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Enum(processor_type) String(cortex-m85) Value( TARGET_CPU_cortexm85)
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EnumValue
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Enum(processor_type) String(cortex-r52plus) Value( TARGET_CPU_cortexr52plus)
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‎gcc/config/arm/arm-tune.md‎

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@@ -49,6 +49,6 @@
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cortexa710,cortexx1,neoversen1,
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cortexa75cortexa55,cortexa76cortexa55,neoversev1,
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neoversen2,cortexm23,cortexm33,
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cortexm35p,cortexm55,cortexr52,
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cortexm35p,cortexm55,cortexm85,cortexr52,
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cortexr52plus"
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(const (symbol_ref "((enum attr_tune) arm_tune)")))

‎gcc/doc/invoke.texi‎

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@@ -21180,7 +21180,7 @@ Permissible names are: @samp{arm7tdmi}, @samp{arm7tdmi-s}, @samp{arm710t},
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@samp{cortex-r7}, @samp{cortex-r8}, @samp{cortex-r52}, @samp{cortex-r52plus},
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@samp{cortex-m0}, @samp{cortex-m0plus}, @samp{cortex-m1}, @samp{cortex-m3},
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@samp{cortex-m4}, @samp{cortex-m7}, @samp{cortex-m23}, @samp{cortex-m33},
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@samp{cortex-m35p}, @samp{cortex-m55}, @samp{cortex-x1},
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@samp{cortex-m35p}, @samp{cortex-m55}, @samp{cortex-m85}, @samp{cortex-x1},
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@samp{cortex-m1.small-multiply}, @samp{cortex-m0.small-multiply},
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@samp{cortex-m0plus.small-multiply}, @samp{exynos-m1}, @samp{marvell-pj4},
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@samp{neoverse-n1}, @samp{neoverse-n2}, @samp{neoverse-v1}, @samp{xscale},
@@ -21244,14 +21244,25 @@ The following extension options are common to the listed CPUs:
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@table @samp
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@item +nodsp
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Disable the DSP instructions on @samp{cortex-m33}, @samp{cortex-m35p}.
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Disable the DSP instructions on @samp{cortex-m33}, @samp{cortex-m35p} and @samp{cortex-m85}. Also disable the M-Profile Vector Extension (MVE) integer and single precision floating-point instructions on @samp{cortex-m85}.
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@item +nopacbti
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Disable the Pointer Authentication and Branch Target Identification Extension
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on @samp{cortex-m85}.
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@item +nomve
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Disable the M-Profile Vector Extension (MVE) integer and single precision
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floating-point instructions on @samp{cortex-m85}.
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@item +nomve.fp
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Disable the M-Profile Vector Extension (MVE) single precision floating-point
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instructions on @samp{cortex-m85}.
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@item +nofp
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Disables the floating-point instructions on @samp{arm9e},
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@samp{arm946e-s}, @samp{arm966e-s}, @samp{arm968e-s}, @samp{arm10e},
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@samp{arm1020e}, @samp{arm1022e}, @samp{arm926ej-s},
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@samp{arm1026ej-s}, @samp{cortex-r5}, @samp{cortex-r7}, @samp{cortex-r8},
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@samp{cortex-m4}, @samp{cortex-m7}, @samp{cortex-m33} and @samp{cortex-m35p}.
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@samp{cortex-m4}, @samp{cortex-m7}, @samp{cortex-m33} and @samp{cortex-m35p} and @samp{cortex-m85}.
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Disables the floating-point and SIMD instructions on
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@samp{generic-armv7-a}, @samp{cortex-a5}, @samp{cortex-a7},
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@samp{cortex-a8}, @samp{cortex-a9}, @samp{cortex-a12},
@@ -21591,7 +21602,7 @@ Development Tools Engineering Specification", which can be found on
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Mitigate against a potential security issue with the @code{VLLDM} instruction
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in some M-profile devices when using CMSE (CVE-2021-365465). This option is
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enabled by default when the option @option{-mcpu=} is used with
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@code{cortex-m33}, @code{cortex-m35p} or @code{cortex-m55}. The option
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@code{cortex-m33}, @code{cortex-m35p} or @code{cortex-m55}, @code{cortex-m85}. The option
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@option{-mno-fix-cmse-cve-2021-35465} can be used to disable the mitigation.
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@item -mstack-protector-guard=@var{guard}

‎gcc/testsuite/gcc.target/arm/multilib.exp‎

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@@ -521,6 +521,11 @@ if {[multilib_config "rmprofile"] } {
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{-mcpu=cortex-m23 -mfpu=fpv5-d16 -mfloat-abi=soft} "thumb/v8-m.base/nofp"
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{-mcpu=cortex-m33 -mfpu=fpv5-d16 -mfloat-abi=soft} "thumb/v8-m.main/nofp"
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{-mcpu=cortex-m7+nofp.dp -mfpu=fpv5-d16 -mfloat-abi=soft} "thumb/v7e-m/nofp"
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{-mcpu=cortex-m85+nopacbti -mfpu=auto -mfloat-abi=soft} "thumb/v8-m.main/nofp"
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{-mcpu=cortex-m85+nopacbti+nofp -mfpu=auto -mfloat-abi=soft} "thumb/v8-m.main/nofp"
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{-mcpu=cortex-m85+nopacbti+nomve -mfpu=auto -mfloat-abi=soft} "thumb/v8-m.main/nofp"
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{-mcpu=cortex-m85+nopacbti+nodsp -mfpu=auto -mfloat-abi=soft} "thumb/v8-m.main/nofp"
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{-mcpu=cortex-m85+nopacbti+nomve.fp -mfpu=auto -mfloat-abi=soft} "thumb/v8-m.main/nofp"
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{-mcpu=cortex-m4 -mfpu=auto -mfloat-abi=hard} "thumb/v7e-m+fp/hard"
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{-mcpu=cortex-m7 -mfpu=auto -mfloat-abi=hard} "thumb/v7e-m+dp/hard"
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{-mcpu=cortex-m33 -mfpu=auto -mfloat-abi=hard} "thumb/v8-m.main+fp/hard"
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{-mcpu=cortex-m7 -mfpu=fpv5-d16 -mfloat-abi=hard} "thumb/v7e-m+dp/hard"
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{-mcpu=cortex-m33 -mfpu=fpv5-d16 -mfloat-abi=hard} "thumb/v8-m.main+dp/hard"
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{-mcpu=cortex-m7+nofp.dp -mfpu=fpv5-d16 -mfloat-abi=hard} "thumb/v7e-m+dp/hard"
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{-mcpu=cortex-m85+nopacbti -mfpu=auto -mfloat-abi=hard} "thumb/v8-m.main+dp/hard"
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{-mcpu=cortex-m85+nopacbti+nomve -mfpu=auto -mfloat-abi=hard} "thumb/v8-m.main+dp/hard"
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{-mcpu=cortex-m85+nopacbti+nodsp -mfpu=auto -mfloat-abi=hard} "thumb/v8-m.main+dp/hard"
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{-mcpu=cortex-m85+nopacbti+nofp -mfpu=auto -mfloat-abi=hard} "thumb/v8.1-m.main+mve/hard"
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{-mcpu=cortex-m85+nopacbti+nomve.fp -mfpu=auto -mfloat-abi=hard} "thumb/v8-m.main+dp/hard"
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{-mcpu=cortex-m85 -mbranch-protection=standard -mfpu=auto -mfloat-abi=hard} "thumb/v8.1-m.main+pacbti+dp/mbranch-protection/hard"
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{-mcpu=cortex-m85+nomve.fp -mbranch-protection=standard -mfpu=auto -mfloat-abi=hard} "thumb/v8.1-m.main+pacbti+dp/mbranch-protection/hard"
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{-mcpu=cortex-m85+nomve -mbranch-protection=standard -mfpu=auto -mfloat-abi=hard} "thumb/v8.1-m.main+pacbti+dp/mbranch-protection/hard"
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{-mcpu=cortex-m85+nodsp -mbranch-protection=standard -mfpu=auto -mfloat-abi=hard} "thumb/v8.1-m.main+pacbti+dp/mbranch-protection/hard"
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{-mcpu=cortex-m0 -mfpu=auto -mfloat-abi=softfp} "thumb/v6-m/nofp"
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{-mcpu=cortex-m1 -mfpu=auto -mfloat-abi=softfp} "thumb/v6-m/nofp"
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{-mcpu=cortex-m3 -mfpu=auto -mfloat-abi=softfp} "thumb/v7-m/nofp"
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{-mcpu=cortex-m23 -mfpu=fpv5-d16 -mfloat-abi=softfp} "thumb/v8-m.base/nofp"
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{-mcpu=cortex-m33 -mfpu=fpv5-d16 -mfloat-abi=softfp} "thumb/v8-m.main+dp/softfp"
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{-mcpu=cortex-m7+nofp.dp -mfpu=fpv5-d16 -mfloat-abi=softfp} "thumb/v7e-m+dp/softfp"
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{-mcpu=cortex-m85+nopacbti+nofp -mfpu=auto -mfloat-abi=softfp} "thumb/v8-m.main/nofp"
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{-mcpu=cortex-m85+nopacbti -mfpu=auto -mfloat-abi=softfp} "thumb/v8-m.main+dp/softfp"
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{-mcpu=cortex-m85+nopacbti+nomve -mfpu=auto -mfloat-abi=softfp} "thumb/v8-m.main+dp/softfp"
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{-mcpu=cortex-m85+nopacbti+nodsp -mfpu=auto -mfloat-abi=softfp} "thumb/v8-m.main+dp/softfp"
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{-mcpu=cortex-m85+nopacbti+nomve.fp -mfpu=auto -mfloat-abi=softfp} "thumb/v8-m.main+dp/softfp"
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{-mcpu=cortex-m85 -mbranch-protection=standard -mfpu=auto -mfloat-abi=softfp} "thumb/v8.1-m.main+pacbti+dp/mbranch-protection/softfp"
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{-mcpu=cortex-m85+nomve.fp -mbranch-protection=standard -mfpu=auto -mfloat-abi=softfp} "thumb/v8.1-m.main+pacbti+dp/mbranch-protection/softfp"
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{-mcpu=cortex-m85+nomve -mbranch-protection=standard -mfpu=auto -mfloat-abi=softfp} "thumb/v8.1-m.main+pacbti+dp/mbranch-protection/softfp"
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{-mcpu=cortex-m85+nodsp -mbranch-protection=standard -mfpu=auto -mfloat-abi=softfp} "thumb/v8.1-m.main+pacbti+dp/mbranch-protection/softfp"
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{-march=armv6-m -mfpu=auto -mfloat-abi=soft} "thumb/v6-m/nofp"
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{-march=armv7-m -mfpu=auto -mfloat-abi=soft} "thumb/v7-m/nofp"
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{-march=armv7e-m -mfpu=auto -mfloat-abi=soft} "thumb/v7e-m/nofp"

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