devel/llvm-cheriot: compiler for CHERIoT ISA

Add a port of the CHERIoT compiler.  The CHERIoT ISA adds CHERI to
RV32e (a microcontroller RISC-V variant).  A number of products based
on CHERIoT are in the pipeline including the Sonata board from lowRISC's
Sunburst Project (https://www.sunburst-project.org).

Requested by:	emaste

devel/Makefile

@@ -1467,6 +1467,7 @@
     SUBDIR += llnextgen
     SUBDIR += llvm
     SUBDIR += llvm-cheri
+    SUBDIR += llvm-cheriot
     SUBDIR += llvm-devel
     SUBDIR += llvm-morello
     SUBDIR += llvm10

devel/llvm-cheriot/Makefile

@@ -0,0 +1,23 @@
+# llvm-cheriot
+
+LLVM_SUFFIX=	-cheriot
+
+COMMENT=	LLVM and Clang with support the CHERIoT microcontroller
+WWW=		https://www.microsoft.com/en-us/research/publication/cheriot-rethinking-security-for-low-cost-embedded-systems/
+
+DISTINFO_FILE=	${.CURDIR}/distinfo
+DESCR=		${.CURDIR}/pkg-descr
+PLIST=		${.CURDIR}/pkg-plist
+
+LLVM_TARGETS=          RISCV
+CMAKE_FLAGS+=	-DLLVM_DEFAULT_TARGET_TRIPLE=riscv32-unknown-unknown
+
+.if exists(${.CURDIR}/files)
+EXTRA_PATCHES=	${.CURDIR}/files
+.endif
+
+.include "${.CURDIR}/Makefile.snapshot"
+
+MASTERDIR=	${.CURDIR}/../llvm-cheri
+
+.include "${MASTERDIR}/Makefile"

devel/llvm-cheriot/Makefile.COMMANDS

@@ -0,0 +1,6 @@
+.include "${.CURDIR}/../llvm-cheri/Makefile.COMMANDS"
+
+# Work around version skew with llvm-cheri
+LLVM_COMMANDS:=	${LLVM_COMMANDS:Nllvm-debuginfod-find:Nllvm-tli-checker}
+CLANG_COMMANDS:=${CLANG_COMMANDS:Nclang-linker-wrapper:Nclang-nvlink-wrapper:Nclang-repl}
+LLD_COMMANDS+=	ld64.lld.darwinnew ld64.lld.darwinold

devel/llvm-cheriot/Makefile.MAN1SRCS

@@ -0,0 +1,4 @@
+.include "${.PARSEDIR}/../llvm-cheri/Makefile.MAN1SRCS"
+
+# Workaround for llvm-cheri/llvm-morello version skew
+LLVM_MAN1SRCS:=	${LLVM_MAN1SRCS:Nllvm-tli-checker.1}

devel/llvm-cheriot/Makefile.snapshot

@@ -0,0 +1,9 @@
+# Generated file!  Do not edit!
+#
+# Generated by: files/gen-Makefile.snapshot.sh.
+#
+LLVM_MAJOR=	13
+LLVM_RELEASE=	${LLVM_MAJOR}.0.0
+SNAPDATE=	20230706
+
+LLVM_COMMIT=		a6c9dc0a4232ed4a64acc6ba4fc7f2754de1ed45

devel/llvm-cheriot/distinfo

@@ -0,0 +1,3 @@
+TIMESTAMP = 1699044153
+SHA256 (CTSRD-CHERI-llvm-project-13.0.d20230706-a6c9dc0a4232ed4a64acc6ba4fc7f2754de1ed45_GH0.tar.gz) = 955d8fb500a9512d1085caf3a6b250e3d297554d4905aa7e2b7b76fed8280c33
+SIZE (CTSRD-CHERI-llvm-project-13.0.d20230706-a6c9dc0a4232ed4a64acc6ba4fc7f2754de1ed45_GH0.tar.gz) = 152251308

devel/llvm-cheriot/files/gen-Makefile.snapshot.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+#
+# Simple script to fetch the latest commits via the github API.  Requires
+# curl and jq.  Uses unauthenticated access which is ratelimited to 60
+# queries per hour.
+
+REPOS_URL=https://api.github.com/repos/CTSRD-CHERI
+MAX_DATE=1970101
+
+tmpfile=`mktemp -t gen-Makefile.snapshot`
+
+query_repo()
+{
+	curl ${REPOS_URL}/$1/branches/cheriot > $tmpfile
+
+	# Accumulate the dates of the last commits to find the snapshot date
+	committime=`jq -r '.commit.commit.committer.date' $tmpfile`
+	committime=${committime%%T*}
+	year=${committime%%-*}
+	month=${committime%-*}
+	month=${month#*-}
+	day=${committime##*-}
+	dateint=${year}${month}${day}
+	if [ $dateint -gt $MAX_DATE ]; then
+		export MAX_DATE=$dateint
+	fi
+
+	SHA=`jq -r '.commit.sha' $tmpfile`
+}
+
+query_repo llvm-project
+LLVM_COMMIT=$SHA
+
+cat <<EOF > Makefile.snapshot
+# Generated file!  Do not edit!
+#
+# Generated by: files/gen-Makefile.snapshot.sh.
+#
+LLVM_MAJOR=	13
+LLVM_RELEASE=	\${LLVM_MAJOR}.0.0
+SNAPDATE=	${MAX_DATE}
+
+LLVM_COMMIT=		${LLVM_COMMIT}
+EOF
+
+rm -f $tmpfile

devel/llvm-cheriot/pkg-descr

@@ -0,0 +1,6 @@
+The LLVM Project is a collection of modular and reusable compiler and
+toolchain technologies.  This version adds support for the Arm Morello
+prototype architecture (CHERI ported to ARMv8-A).
+
+This port includes Clang (a C/C++/Objective-C compiler), LLD (a linker),
+and the LLVM infrastructure these are built on.