Quelle  gen-atomic-fallback.sh   Sprache: Shell

#!/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 ret="$(gen_ret_type "${meta}" "${int}")"
 local retstmt="$(gen_ret_stmt "${meta}")"
 local params="$(gen_params "${int}" "${atomic}" "$@")"
 local args="$(gen_args "$@")"

 . ${template}
}

#gen_order_fallback(meta, pfx, name, sfx, order, atomic, int, args...)
gen_order_fallback()
{
 local meta="$1"; shift
 local pfx="$1"; shift
 local name="$1"; shift
 local sfx="$1"; shift
 local order="$1"; shift

 local tmpl_order=${order#_}
 local tmpl="${ATOMICDIR}/fallbacks/${tmpl_order:-fence}"
 gen_template_fallback "${tmpl}" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "$@"
}

#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_proto_order_variant(meta, pfx, name, sfx, order, atomic, int, args...)
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"; shift
 local int="$1"; shift

 local atomicname="${atomic}_${pfx}${name}${sfx}${order}"
 local basename="${atomic}_${pfx}${name}${sfx}"

 local template="$(find_fallback_template "${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 "$@")"

 gen_kerneldoc "raw_" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "${atomic}" "${int}" "$@"

 printf "static __always_inline ${ret}\n"
 printf "raw_${atomicname}(${params})\n"
 printf "{\n"

 # Where there is no possible fallback, this order variant is mandatory
 # and must be provided by arch code. Add a comment to the header to
 # make this obvious.
 #
 # Ideally we'd error on a missing definition, but arch code might
 # define this order variant as a C function without a preprocessor
 # symbol.
 if [ -z ${template} ] && [ -z "${order}" ] && ! meta_has_relaxed "${meta}"; then
  printf "\t${retstmt}arch_${atomicname}(${args});\n"
  printf "}\n\n"
  return
 fi

 printf "#if defined(arch_${atomicname})\n"
 printf "\t${retstmt}arch_${atomicname}(${args});\n"

 # Allow FULL/ACQUIRE/RELEASE ops to be defined in terms of RELAXED ops
 if [ "${order}" != "_relaxed" ] && meta_has_relaxed "${meta}"; then
  printf "#elif defined(arch_${basename}_relaxed)\n"
  gen_order_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "${atomic}" "${int}" "$@"
 fi

 # Allow ACQUIRE/RELEASE/RELAXED ops to be defined in terms of FULL ops
 if [ ! -z "${order}" ] && ! meta_is_implicitly_relaxed "${meta}"; then
  printf "#elif defined(arch_${basename})\n"
  printf "\t${retstmt}arch_${basename}(${args});\n"
 fi

 printf "#else\n"
 if [ ! -z "${template}" ]; then
  gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "${atomic}" "${int}" "$@"
 else
  printf "#error \"Unable to define raw_${atomicname}\"\n"
 fi

 printf "#endif\n"
 printf "}\n\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"

 gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"

 if meta_has_acquire "${meta}"; then
  gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
 fi

 if meta_has_release "${meta}"; then
  gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
 fi

 if meta_has_relaxed "${meta}"; then
  gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
 fi
}

#gen_basic_fallbacks(basename)
gen_basic_fallbacks()
{
 local basename="$1"; shift
cat << EOF
#define raw_${basename}_acquire arch_${basename}
#define raw_${basename}_release arch_${basename}
#define raw_${basename}_relaxed arch_${basename}
EOF
}

gen_order_fallbacks()
{
 local xchg="$1"; shift

cat <<EOF

#define raw_${xchg}_relaxed arch_${xchg}_relaxed

#ifdef arch_${xchg}_acquire
#define raw_${xchg}_acquire arch_${xchg}_acquire
#else
#define raw_${xchg}_acquire(...) \\
 __atomic_op_acquire(arch_${xchg}, __VA_ARGS__)
#endif

#ifdef arch_${xchg}_release
#define raw_${xchg}_release arch_${xchg}_release
#else
#define raw_${xchg}_release(...) \\
 __atomic_op_release(arch_${xchg}, __VA_ARGS__)
#endif

#ifdef arch_${xchg}
#define raw_${xchg} arch_${xchg}
#else
#define raw_${xchg}(...) \\
 __atomic_op_fence(arch_${xchg}, __VA_ARGS__)
#endif

EOF
}

gen_xchg_order_fallback()
{
 local xchg="$1"; shift
 local order="$1"; shift
 local forder="${order:-_fence}"

 printf "#if defined(arch_${xchg}${order})\n"
 printf "#define raw_${xchg}${order} arch_${xchg}${order}\n"

 if [ "${order}" != "_relaxed" ]; then
  printf "#elif defined(arch_${xchg}_relaxed)\n"
  printf "#define raw_${xchg}${order}(...) \\\\\n"
  printf " __atomic_op${forder}(arch_${xchg}, __VA_ARGS__)\n"
 fi

 if [ ! -z "${order}" ]; then
  printf "#elif defined(arch_${xchg})\n"
  printf "#define raw_${xchg}${order} arch_${xchg}\n"
 fi

 printf "#else\n"
 printf "extern void raw_${xchg}${order}_not_implemented(void);\n"
 printf "#define raw_${xchg}${order}(...) raw_${xchg}${order}_not_implemented()\n"
 printf "#endif\n\n"
}

gen_xchg_fallbacks()
{
 local xchg="$1"; shift

 for order in "" "_acquire" "_release" "_relaxed"; do
  gen_xchg_order_fallback "${xchg}" "${order}"
 done
}

gen_try_cmpxchg_fallback()
{
 local prefix="$1"; shift
 local cmpxchg="$1"; shift;
 local suffix="$1"; shift;

cat <<EOF
#define raw_${prefix}try_${cmpxchg}${suffix}(_ptr, _oldp, _new) \\
({ \\
 typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \\
 ___r = raw_${prefix}${cmpxchg}${suffix}((_ptr), ___o, (_new)); \\
 if (unlikely(___r != ___o)) \\
  *___op = ___r; \\
 likely(___r == ___o); \\
})
EOF
}

gen_try_cmpxchg_order_fallback()
{
 local cmpxchg="$1"; shift
 local order="$1"; shift
 local forder="${order:-_fence}"

 printf "#if defined(arch_try_${cmpxchg}${order})\n"
 printf "#define raw_try_${cmpxchg}${order} arch_try_${cmpxchg}${order}\n"

 if [ "${order}" != "_relaxed" ]; then
  printf "#elif defined(arch_try_${cmpxchg}_relaxed)\n"
  printf "#define raw_try_${cmpxchg}${order}(...) \\\\\n"
  printf " __atomic_op${forder}(arch_try_${cmpxchg}, __VA_ARGS__)\n"
 fi

 if [ ! -z "${order}" ]; then
  printf "#elif defined(arch_try_${cmpxchg})\n"
  printf "#define raw_try_${cmpxchg}${order} arch_try_${cmpxchg}\n"
 fi

 printf "#else\n"
 gen_try_cmpxchg_fallback "" "${cmpxchg}" "${order}"
 printf "#endif\n\n"
}

gen_try_cmpxchg_order_fallbacks()
{
 local cmpxchg="$1"; shift;

 for order in "" "_acquire" "_release" "_relaxed"; do
  gen_try_cmpxchg_order_fallback "${cmpxchg}" "${order}"
 done
}

gen_def_and_try_cmpxchg_fallback()
{
 local prefix="$1"; shift
 local cmpxchg="$1"; shift
 local suffix="$1"; shift

 printf "#define raw_${prefix}${cmpxchg}${suffix} arch_${prefix}${cmpxchg}${suffix}\n\n"
 printf "#ifdef arch_${prefix}try_${cmpxchg}${suffix}\n"
 printf "#define raw_${prefix}try_${cmpxchg}${suffix} arch_${prefix}try_${cmpxchg}${suffix}\n"
 printf "#else\n"
 gen_try_cmpxchg_fallback "${prefix}" "${cmpxchg}" "${suffix}"
 printf "#endif\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 "xchg" "cmpxchg" "cmpxchg64" "cmpxchg128"; do
 gen_xchg_fallbacks "${xchg}"
done

for cmpxchg in "cmpxchg" "cmpxchg64" "cmpxchg128"; do
 gen_try_cmpxchg_order_fallbacks "${cmpxchg}"
done

for cmpxchg in "cmpxchg" "cmpxchg64" "cmpxchg128"; do
 gen_def_and_try_cmpxchg_fallback "" "${cmpxchg}" "_local"
done

for cmpxchg in "cmpxchg"; do
 gen_def_and_try_cmpxchg_fallback "sync_" "${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