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-rwxr-xr-xscripts/atomic/gen-atomic-fallback.sh245
1 files changed, 245 insertions, 0 deletions
diff --git a/scripts/atomic/gen-atomic-fallback.sh b/scripts/atomic/gen-atomic-fallback.sh
new file mode 100755
index 000000000..3a07695e3
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+++ b/scripts/atomic/gen-atomic-fallback.sh
@@ -0,0 +1,245 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+ATOMICDIR=$(dirname $0)
+
+. ${ATOMICDIR}/atomic-tbl.sh
+
+#gen_template_fallback(template, meta, pfx, name, sfx, order, atomic, int, args...)
+gen_template_fallback()
+{
+ local template="$1"; shift
+ local meta="$1"; shift
+ local pfx="$1"; shift
+ local name="$1"; shift
+ local sfx="$1"; shift
+ local order="$1"; shift
+ local atomic="$1"; shift
+ local int="$1"; shift
+
+ local atomicname="arch_${atomic}_${pfx}${name}${sfx}${order}"
+
+ local ret="$(gen_ret_type "${meta}" "${int}")"
+ local retstmt="$(gen_ret_stmt "${meta}")"
+ local params="$(gen_params "${int}" "${atomic}" "$@")"
+ local args="$(gen_args "$@")"
+
+ if [ ! -z "${template}" ]; then
+ printf "#ifndef ${atomicname}\n"
+ . ${template}
+ printf "#define ${atomicname} ${atomicname}\n"
+ printf "#endif\n\n"
+ fi
+}
+
+#gen_proto_fallback(meta, pfx, name, sfx, order, atomic, int, args...)
+gen_proto_fallback()
+{
+ local meta="$1"; shift
+ local pfx="$1"; shift
+ local name="$1"; shift
+ local sfx="$1"; shift
+ local order="$1"; shift
+
+ local tmpl="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
+ gen_template_fallback "${tmpl}" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "$@"
+}
+
+#gen_basic_fallbacks(basename)
+gen_basic_fallbacks()
+{
+ local basename="$1"; shift
+cat << EOF
+#define ${basename}_acquire ${basename}
+#define ${basename}_release ${basename}
+#define ${basename}_relaxed ${basename}
+EOF
+}
+
+gen_proto_order_variant()
+{
+ local meta="$1"; shift
+ local pfx="$1"; shift
+ local name="$1"; shift
+ local sfx="$1"; shift
+ local order="$1"; shift
+ local atomic="$1"
+
+ local basename="arch_${atomic}_${pfx}${name}${sfx}"
+
+ printf "#define ${basename}${order} ${basename}${order}\n"
+}
+
+#gen_proto_order_variants(meta, pfx, name, sfx, atomic, int, args...)
+gen_proto_order_variants()
+{
+ local meta="$1"; shift
+ local pfx="$1"; shift
+ local name="$1"; shift
+ local sfx="$1"; shift
+ local atomic="$1"
+
+ local basename="arch_${atomic}_${pfx}${name}${sfx}"
+
+ local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
+
+ # If we don't have relaxed atomics, then we don't bother with ordering fallbacks
+ # read_acquire and set_release need to be templated, though
+ if ! meta_has_relaxed "${meta}"; then
+ gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
+
+ if meta_has_acquire "${meta}"; then
+ gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
+ fi
+
+ if meta_has_release "${meta}"; then
+ gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
+ fi
+
+ return
+ fi
+
+ printf "#ifndef ${basename}_relaxed\n"
+
+ if [ ! -z "${template}" ]; then
+ printf "#ifdef ${basename}\n"
+ fi
+
+ gen_basic_fallbacks "${basename}"
+
+ if [ ! -z "${template}" ]; then
+ printf "#endif /* ${basename} */\n\n"
+ gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
+ gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
+ gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
+ gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
+ fi
+
+ printf "#else /* ${basename}_relaxed */\n\n"
+
+ gen_template_fallback "${ATOMICDIR}/fallbacks/acquire" "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
+ gen_template_fallback "${ATOMICDIR}/fallbacks/release" "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
+ gen_template_fallback "${ATOMICDIR}/fallbacks/fence" "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
+
+ printf "#endif /* ${basename}_relaxed */\n\n"
+}
+
+gen_order_fallbacks()
+{
+ local xchg="$1"; shift
+
+cat <<EOF
+
+#ifndef ${xchg}_acquire
+#define ${xchg}_acquire(...) \\
+ __atomic_op_acquire(${xchg}, __VA_ARGS__)
+#endif
+
+#ifndef ${xchg}_release
+#define ${xchg}_release(...) \\
+ __atomic_op_release(${xchg}, __VA_ARGS__)
+#endif
+
+#ifndef ${xchg}
+#define ${xchg}(...) \\
+ __atomic_op_fence(${xchg}, __VA_ARGS__)
+#endif
+
+EOF
+}
+
+gen_xchg_fallbacks()
+{
+ local xchg="$1"; shift
+ printf "#ifndef ${xchg}_relaxed\n"
+
+ gen_basic_fallbacks ${xchg}
+
+ printf "#else /* ${xchg}_relaxed */\n"
+
+ gen_order_fallbacks ${xchg}
+
+ printf "#endif /* ${xchg}_relaxed */\n\n"
+}
+
+gen_try_cmpxchg_fallback()
+{
+ local cmpxchg="$1"; shift;
+ local order="$1"; shift;
+
+cat <<EOF
+#ifndef arch_try_${cmpxchg}${order}
+#define arch_try_${cmpxchg}${order}(_ptr, _oldp, _new) \\
+({ \\
+ typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \\
+ ___r = arch_${cmpxchg}${order}((_ptr), ___o, (_new)); \\
+ if (unlikely(___r != ___o)) \\
+ *___op = ___r; \\
+ likely(___r == ___o); \\
+})
+#endif /* arch_try_${cmpxchg}${order} */
+
+EOF
+}
+
+gen_try_cmpxchg_fallbacks()
+{
+ local cmpxchg="$1"; shift;
+
+ printf "#ifndef arch_try_${cmpxchg}_relaxed\n"
+ printf "#ifdef arch_try_${cmpxchg}\n"
+
+ gen_basic_fallbacks "arch_try_${cmpxchg}"
+
+ printf "#endif /* arch_try_${cmpxchg} */\n\n"
+
+ for order in "" "_acquire" "_release" "_relaxed"; do
+ gen_try_cmpxchg_fallback "${cmpxchg}" "${order}"
+ done
+
+ printf "#else /* arch_try_${cmpxchg}_relaxed */\n"
+
+ gen_order_fallbacks "arch_try_${cmpxchg}"
+
+ printf "#endif /* arch_try_${cmpxchg}_relaxed */\n\n"
+}
+
+cat << EOF
+// SPDX-License-Identifier: GPL-2.0
+
+// Generated by $0
+// DO NOT MODIFY THIS FILE DIRECTLY
+
+#ifndef _LINUX_ATOMIC_FALLBACK_H
+#define _LINUX_ATOMIC_FALLBACK_H
+
+#include <linux/compiler.h>
+
+EOF
+
+for xchg in "arch_xchg" "arch_cmpxchg" "arch_cmpxchg64"; do
+ gen_xchg_fallbacks "${xchg}"
+done
+
+for cmpxchg in "cmpxchg" "cmpxchg64"; do
+ gen_try_cmpxchg_fallbacks "${cmpxchg}"
+done
+
+grep '^[a-z]' "$1" | while read name meta args; do
+ gen_proto "${meta}" "${name}" "atomic" "int" ${args}
+done
+
+cat <<EOF
+#ifdef CONFIG_GENERIC_ATOMIC64
+#include <asm-generic/atomic64.h>
+#endif
+
+EOF
+
+grep '^[a-z]' "$1" | while read name meta args; do
+ gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
+done
+
+cat <<EOF
+#endif /* _LINUX_ATOMIC_FALLBACK_H */
+EOF