1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
3
4ATOMICDIR=$(dirname $0)
5
6. ${ATOMICDIR}/atomic-tbl.sh
7
8#gen_param_check(meta, arg)
9gen_param_check()
10{
11	local meta="$1"; shift
12	local arg="$1"; shift
13	local type="${arg%%:*}"
14	local name="$(gen_param_name "${arg}")"
15	local rw="write"
16
17	case "${type#c}" in
18	i) return;;
19	esac
20
21	if [ ${type#c} != ${type} ]; then
22		# We don't write to constant parameters.
23		rw="read"
24	elif [ "${meta}" != "s" ]; then
25		# An atomic RMW: if this parameter is not a constant, and this atomic is
26		# not just a 's'tore, this parameter is both read from and written to.
27		rw="read_write"
28	fi
29
30	printf "\tinstrument_atomic_${rw}(${name}, sizeof(*${name}));\n"
31}
32
33#gen_params_checks(meta, arg...)
34gen_params_checks()
35{
36	local meta="$1"; shift
37
38	while [ "$#" -gt 0 ]; do
39		gen_param_check "$meta" "$1"
40		shift;
41	done
42}
43
44#gen_proto_order_variant(meta, pfx, name, sfx, order, atomic, int, arg...)
45gen_proto_order_variant()
46{
47	local meta="$1"; shift
48	local pfx="$1"; shift
49	local name="$1"; shift
50	local sfx="$1"; shift
51	local order="$1"; shift
52	local atomic="$1"; shift
53	local int="$1"; shift
54
55	local atomicname="${atomic}_${pfx}${name}${sfx}${order}"
56
57	local ret="$(gen_ret_type "${meta}" "${int}")"
58	local params="$(gen_params "${int}" "${atomic}" "$@")"
59	local checks="$(gen_params_checks "${meta}" "$@")"
60	local args="$(gen_args "$@")"
61	local retstmt="$(gen_ret_stmt "${meta}")"
62
63cat <<EOF
64static __always_inline ${ret}
65${atomicname}(${params})
66{
67${checks}
68	${retstmt}arch_${atomicname}(${args});
69}
70EOF
71
72	printf "\n"
73}
74
75gen_xchg()
76{
77	local xchg="$1"; shift
78	local mult="$1"; shift
79
80	if [ "${xchg%${xchg#try_cmpxchg}}" = "try_cmpxchg" ] ; then
81
82cat <<EOF
83#define ${xchg}(ptr, oldp, ...) \\
84({ \\
85	typeof(ptr) __ai_ptr = (ptr); \\
86	typeof(oldp) __ai_oldp = (oldp); \\
87	instrument_atomic_write(__ai_ptr, ${mult}sizeof(*__ai_ptr)); \\
88	instrument_atomic_write(__ai_oldp, ${mult}sizeof(*__ai_oldp)); \\
89	arch_${xchg}(__ai_ptr, __ai_oldp, __VA_ARGS__); \\
90})
91EOF
92
93	else
94
95cat <<EOF
96#define ${xchg}(ptr, ...) \\
97({ \\
98	typeof(ptr) __ai_ptr = (ptr); \\
99	instrument_atomic_write(__ai_ptr, ${mult}sizeof(*__ai_ptr)); \\
100	arch_${xchg}(__ai_ptr, __VA_ARGS__); \\
101})
102EOF
103
104	fi
105}
106
107cat << EOF
108// SPDX-License-Identifier: GPL-2.0
109
110// Generated by $0
111// DO NOT MODIFY THIS FILE DIRECTLY
112
113/*
114 * This file provides wrappers with KASAN instrumentation for atomic operations.
115 * To use this functionality an arch's atomic.h file needs to define all
116 * atomic operations with arch_ prefix (e.g. arch_atomic_read()) and include
117 * this file at the end. This file provides atomic_read() that forwards to
118 * arch_atomic_read() for actual atomic operation.
119 * Note: if an arch atomic operation is implemented by means of other atomic
120 * operations (e.g. atomic_read()/atomic_cmpxchg() loop), then it needs to use
121 * arch_ variants (i.e. arch_atomic_read()/arch_atomic_cmpxchg()) to avoid
122 * double instrumentation.
123 */
124#ifndef _ASM_GENERIC_ATOMIC_INSTRUMENTED_H
125#define _ASM_GENERIC_ATOMIC_INSTRUMENTED_H
126
127#include <linux/build_bug.h>
128#include <linux/compiler.h>
129#include <linux/instrumented.h>
130
131EOF
132
133grep '^[a-z]' "$1" | while read name meta args; do
134	gen_proto "${meta}" "${name}" "atomic" "int" ${args}
135done
136
137grep '^[a-z]' "$1" | while read name meta args; do
138	gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
139done
140
141for xchg in "xchg" "cmpxchg" "cmpxchg64" "try_cmpxchg"; do
142	for order in "" "_acquire" "_release" "_relaxed"; do
143		gen_xchg "${xchg}${order}" ""
144		printf "\n"
145	done
146done
147
148for xchg in "cmpxchg_local" "cmpxchg64_local" "sync_cmpxchg"; do
149	gen_xchg "${xchg}" ""
150	printf "\n"
151done
152
153gen_xchg "cmpxchg_double" "2 * "
154
155printf "\n\n"
156
157gen_xchg "cmpxchg_double_local" "2 * "
158
159cat <<EOF
160
161#endif /* _ASM_GENERIC_ATOMIC_INSTRUMENTED_H */
162EOF
163