arm: Add star-mc1 cpu

The star-mc1 is an embedded processor with armv8m architecture.  Majorly
it is designed to meet the requirements of AIoT application performance,
power consumption and security.  This patch is to add support of star-mc1
cpu.

Signed-off-by: Chung-Ju Wu <jasonwucj@gmail.com>

gcc/ChangeLog:

	* config/arm/arm-cpus.in (star-mc1): New cpu.
	* config/arm/arm-tables.opt: Regenerate.
	* config/arm/arm-tune.md: Regenerate.
	* doc/invoke.texi: Update docs.

4 files changed, 20 insertions, 5 deletions

diff --git a/gcc/config/arm/arm-cpus.in b/gcc/config/arm/arm-cpus.in
index 0d3082b..5a63bc5 100644
--- a/gcc/config/arm/arm-cpus.in
+++ b/gcc/config/arm/arm-cpus.in
@@ -1638,6 +1638,16 @@ begin cpu cortex-m55
  vendor 41
 end cpu cortex-m55
 
+begin cpu star-mc1
+ cname starmc1
+ tune flags LDSCHED
+ architecture armv8-m.main+dsp+fp
+ option nofp remove ALL_FP
+ option nodsp remove armv7em
+ isa quirk_no_asmcpu quirk_vlldm
+ costs v7m
+end cpu star-mc1
+
 # V8 R-profile implementations.
 begin cpu cortex-r52
  cname cortexr52
diff --git a/gcc/config/arm/arm-tables.opt b/gcc/config/arm/arm-tables.opt
index ef0cc5e..e6461ab 100644
--- a/gcc/config/arm/arm-tables.opt
+++ b/gcc/config/arm/arm-tables.opt
@@ -283,6 +283,9 @@ EnumValue
 Enum(processor_type) String(cortex-m55) Value( TARGET_CPU_cortexm55)
 
 EnumValue
+Enum(processor_type) String(star-mc1) Value( TARGET_CPU_starmc1)
+
+EnumValue
 Enum(processor_type) String(cortex-r52) Value( TARGET_CPU_cortexr52)
 
 EnumValue
diff --git a/gcc/config/arm/arm-tune.md b/gcc/config/arm/arm-tune.md
index 3422553..abc290e 100644
--- a/gcc/config/arm/arm-tune.md
+++ b/gcc/config/arm/arm-tune.md
@@ -49,6 +49,6 @@
 	cortexa710,cortexx1,neoversen1,
 	cortexa75cortexa55,cortexa76cortexa55,neoversev1,
 	neoversen2,cortexm23,cortexm33,
-	cortexm35p,cortexm55,cortexr52,
-	cortexr52plus"
+	cortexm35p,cortexm55,starmc1,
+	cortexr52,cortexr52plus"
 	(const (symbol_ref "((enum attr_tune) arm_tune)")))
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 8cd5bdd..ac0c06c 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -21190,7 +21190,8 @@ Permissible names are: @samp{arm7tdmi}, @samp{arm7tdmi-s}, @samp{arm710t},
 @samp{cortex-m0plus.small-multiply}, @samp{exynos-m1}, @samp{marvell-pj4},
 @samp{neoverse-n1}, @samp{neoverse-n2}, @samp{neoverse-v1}, @samp{xscale},
 @samp{iwmmxt}, @samp{iwmmxt2}, @samp{ep9312}, @samp{fa526}, @samp{fa626},
-@samp{fa606te}, @samp{fa626te}, @samp{fmp626}, @samp{fa726te}, @samp{xgene1}.
+@samp{fa606te}, @samp{fa626te}, @samp{fmp626}, @samp{fa726te}, @samp{star-mc1},
+@samp{xgene1}.
 
 Additionally, this option can specify that GCC should tune the performance
 of the code for a big.LITTLE system.  Permissible names are:
@@ -21596,8 +21597,9 @@ Development Tools Engineering Specification", which can be found on
 Mitigate against a potential security issue with the @code{VLLDM} instruction
 in some M-profile devices when using CMSE (CVE-2021-365465).  This option is
 enabled by default when the option @option{-mcpu=} is used with
-@code{cortex-m33}, @code{cortex-m35p} or @code{cortex-m55}.  The option
-@option{-mno-fix-cmse-cve-2021-35465} can be used to disable the mitigation.
+@code{cortex-m33}, @code{cortex-m35p}, @code{cortex-m55} or @code{star-mc1}.
+The option @option{-mno-fix-cmse-cve-2021-35465} can be used to disable
+the mitigation.
 
 @item -mstack-protector-guard=@var{guard}
 @itemx -mstack-protector-guard-offset=@var{offset}