#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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ATOMICDIR=$(dirname $0)
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. ${ATOMICDIR}/atomic-tbl.sh
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#gen_param_check(meta, arg)
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gen_param_check()
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{
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local meta="$1"; shift
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local arg="$1"; shift
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local type="${arg%%:*}"
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local name="$(gen_param_name "${arg}")"
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local rw="write"
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case "${type#c}" in
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i) return;;
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esac
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if [ ${type#c} != ${type} ]; then
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# We don't write to constant parameters.
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rw="read"
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elif [ "${meta}" != "s" ]; then
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# An atomic RMW: if this parameter is not a constant, and this atomic is
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# not just a 's'tore, this parameter is both read from and written to.
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rw="read_write"
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fi
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printf "\tinstrument_atomic_${rw}(${name}, sizeof(*${name}));\n"
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}
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#gen_params_checks(meta, arg...)
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gen_params_checks()
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{
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local meta="$1"; shift
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while [ "$#" -gt 0 ]; do
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gen_param_check "$meta" "$1"
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shift;
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done
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}
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# gen_guard(meta, atomic, pfx, name, sfx, order)
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gen_guard()
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{
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local meta="$1"; shift
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local atomic="$1"; shift
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local pfx="$1"; shift
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local name="$1"; shift
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local sfx="$1"; shift
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local order="$1"; shift
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local atomicname="arch_${atomic}_${pfx}${name}${sfx}${order}"
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local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
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# We definitely need a preprocessor symbol for this atomic if it is an
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# ordering variant, or if there's a generic fallback.
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if [ ! -z "${order}" ] || [ ! -z "${template}" ]; then
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printf "defined(${atomicname})"
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return
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fi
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# If this is a base variant, but a relaxed variant *may* exist, then we
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# only have a preprocessor symbol if the relaxed variant isn't defined
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if meta_has_relaxed "${meta}"; then
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printf "!defined(${atomicname}_relaxed) || defined(${atomicname})"
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fi
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}
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#gen_proto_order_variant(meta, pfx, name, sfx, order, atomic, int, arg...)
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gen_proto_order_variant()
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{
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local meta="$1"; shift
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local pfx="$1"; shift
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local name="$1"; shift
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local sfx="$1"; shift
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local order="$1"; shift
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local atomic="$1"; shift
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local int="$1"; shift
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local atomicname="${atomic}_${pfx}${name}${sfx}${order}"
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local guard="$(gen_guard "${meta}" "${atomic}" "${pfx}" "${name}" "${sfx}" "${order}")"
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local ret="$(gen_ret_type "${meta}" "${int}")"
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local params="$(gen_params "${int}" "${atomic}" "$@")"
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local checks="$(gen_params_checks "${meta}" "$@")"
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local args="$(gen_args "$@")"
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local retstmt="$(gen_ret_stmt "${meta}")"
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[ ! -z "${guard}" ] && printf "#if ${guard}\n"
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cat <<EOF
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static __always_inline ${ret}
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${atomicname}(${params})
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{
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${checks}
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${retstmt}arch_${atomicname}(${args});
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}
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#define ${atomicname} ${atomicname}
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EOF
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[ ! -z "${guard}" ] && printf "#endif\n"
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printf "\n"
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}
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gen_xchg()
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{
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local xchg="$1"; shift
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local mult="$1"; shift
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cat <<EOF
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#define ${xchg}(ptr, ...) \\
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({ \\
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typeof(ptr) __ai_ptr = (ptr); \\
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instrument_atomic_write(__ai_ptr, ${mult}sizeof(*__ai_ptr)); \\
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arch_${xchg}(__ai_ptr, __VA_ARGS__); \\
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})
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EOF
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}
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gen_optional_xchg()
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{
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local name="$1"; shift
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local sfx="$1"; shift
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local guard="defined(arch_${name}${sfx})"
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[ -z "${sfx}" ] && guard="!defined(arch_${name}_relaxed) || defined(arch_${name})"
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printf "#if ${guard}\n"
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gen_xchg "${name}${sfx}" ""
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printf "#endif\n\n"
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}
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cat << EOF
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// SPDX-License-Identifier: GPL-2.0
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// Generated by $0
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// DO NOT MODIFY THIS FILE DIRECTLY
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/*
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* This file provides wrappers with KASAN instrumentation for atomic operations.
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* To use this functionality an arch's atomic.h file needs to define all
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* atomic operations with arch_ prefix (e.g. arch_atomic_read()) and include
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* this file at the end. This file provides atomic_read() that forwards to
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* arch_atomic_read() for actual atomic operation.
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* Note: if an arch atomic operation is implemented by means of other atomic
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* operations (e.g. atomic_read()/atomic_cmpxchg() loop), then it needs to use
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* arch_ variants (i.e. arch_atomic_read()/arch_atomic_cmpxchg()) to avoid
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* double instrumentation.
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*/
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#ifndef _ASM_GENERIC_ATOMIC_INSTRUMENTED_H
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#define _ASM_GENERIC_ATOMIC_INSTRUMENTED_H
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#include <linux/build_bug.h>
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#include <linux/compiler.h>
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#include <linux/instrumented.h>
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EOF
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grep '^[a-z]' "$1" | while read name meta args; do
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gen_proto "${meta}" "${name}" "atomic" "int" ${args}
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done
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grep '^[a-z]' "$1" | while read name meta args; do
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gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
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done
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for xchg in "xchg" "cmpxchg" "cmpxchg64"; do
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for order in "" "_acquire" "_release" "_relaxed"; do
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gen_optional_xchg "${xchg}" "${order}"
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done
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done
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for xchg in "cmpxchg_local" "cmpxchg64_local" "sync_cmpxchg"; do
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gen_xchg "${xchg}" ""
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printf "\n"
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done
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gen_xchg "cmpxchg_double" "2 * "
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printf "\n\n"
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gen_xchg "cmpxchg_double_local" "2 * "
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cat <<EOF
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#endif /* _ASM_GENERIC_ATOMIC_INSTRUMENTED_H */
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EOF
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