Compile out-of-line helpers for atomic operations which can be enabled

through -moutline-atomics.  These are included by default in this updated
version of compiler-rt, we just haven't enabled them yet.  Some ports start
to make use of that option, so it makes sense to provide these helpers.

The helpers would make use of the ARMv8.1 LSE instructions, if we flagged
that the running system supports those.  As we do not yet have a mechanism
to show support for LSE, the code will always fall back to regular atomics.

Issue raised by jca@
Tested by phessler@
Input from jsg@
ok kettenis@

diff --git a/gnu/lib/libcompiler_rt/Makefile b/gnu/lib/libcompiler_rt/Makefile
index ba0c4c5..89db447 100644 (file)
--- a/gnu/lib/libcompiler_rt/Makefile
+++ b/gnu/lib/libcompiler_rt/Makefile
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.5 2021/04/28 22:56:22 drahn Exp $
+# $OpenBSD: Makefile,v 1.6 2021/12/28 15:45:17 patrick Exp $
 
 .include <bsd.own.mk>
 
@@ -14,6 +14,7 @@ NOPIC=
 NOPROFILE=
 
 CFLAGS+=       -fPIC -std=gnu99 -fvisibility=hidden -fno-stack-protector
+CPPFLAGS+=     -I${.CURDIR}/../../llvm/compiler-rt/lib/builtins
 CPPFLAGS+=     -DVISIBILITY_HIDDEN
 
 .if ${MACHINE_ARCH} == "amd64"
@@ -210,6 +211,24 @@ SRCS+=     comparetf2.c \
        multc3.c \
        trunctfdf2.c \
        trunctfsf2.c
+
+# Prepare multiple versions of the LSE-helper
+CPPFLAGS+=-DHAS_ASM_LSE
+.for pat in cas swp ldadd ldclr ldeor ldset
+.  for size in 1 2 4 8 16
+.    for model in 1 2 3 4
+.      if "${pat}" == "cas" || "${size}" != "16"
+outline_atomic_${pat}${size}_${model}.S: Makefile ${.CURDIR}/../../llvm/compiler-rt/lib/builtins/${RTARCH}/lse.S
+       @echo "#define L_${pat}\n#define SIZE ${size}\n#define MODEL ${model}\n" > $@.tmp
+       @cat ${.CURDIR}/../../llvm/compiler-rt/lib/builtins/${RTARCH}/lse.S >> $@.tmp
+       @mv $@.tmp $@
+
+SRCS+= outline_atomic_${pat}${size}_${model}.S
+.      endif
+.    endfor
+.  endfor
+.endfor
+
 .endif
 
 .if ${RTARCH} == "arm"