summaryrefslogtreecommitdiffstats
path: root/scripts/atomic/gen-atomic-instrumented.sh
blob: 8f8f8e3b20f9e6dc9ada0446db06fd175e6fd765 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0

ATOMICDIR=$(dirname $0)

. ${ATOMICDIR}/atomic-tbl.sh

#gen_param_check(meta, arg)
gen_param_check()
{
	local meta="$1"; shift
	local arg="$1"; shift
	local type="${arg%%:*}"
	local name="$(gen_param_name "${arg}")"
	local rw="write"

	case "${type#c}" in
	i) return;;
	esac

	if [ ${type#c} != ${type} ]; then
		# We don't write to constant parameters.
		rw="read"
	elif [ "${meta}" != "s" ]; then
		# An atomic RMW: if this parameter is not a constant, and this atomic is
		# not just a 's'tore, this parameter is both read from and written to.
		rw="read_write"
	fi

	printf "\tinstrument_atomic_${rw}(${name}, sizeof(*${name}));\n"
}

#gen_params_checks(meta, arg...)
gen_params_checks()
{
	local meta="$1"; shift
	local order="$1"; shift

	if [ "${order}" = "_release" ]; then
		printf "\tkcsan_release();\n"
	elif [ -z "${order}" ] && ! meta_in "$meta" "slv"; then
		# RMW with return value is fully ordered
		printf "\tkcsan_mb();\n"
	fi

	while [ "$#" -gt 0 ]; do
		gen_param_check "$meta" "$1"
		shift;
	done
}

#gen_proto_order_variant(meta, pfx, name, sfx, order, atomic, int, arg...)
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 ret="$(gen_ret_type "${meta}" "${int}")"
	local params="$(gen_params "${int}" "${atomic}" "$@")"
	local checks="$(gen_params_checks "${meta}" "${order}" "$@")"
	local args="$(gen_args "$@")"
	local retstmt="$(gen_ret_stmt "${meta}")"

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

cat <<EOF
static __always_inline ${ret}
${atomicname}(${params})
{
${checks}
	${retstmt}raw_${atomicname}(${args});
}
EOF

	printf "\n"
}

gen_xchg()
{
	local xchg="$1"; shift
	local order="$1"; shift

	kcsan_barrier=""
	if [ "${xchg%_local}" = "${xchg}" ]; then
		case "$order" in
		_release)	kcsan_barrier="kcsan_release()" ;;
		"")			kcsan_barrier="kcsan_mb()" ;;
		esac
	fi

	if [ "${xchg%${xchg#try_cmpxchg}}" = "try_cmpxchg" ] ; then

cat <<EOF
#define ${xchg}${order}(ptr, oldp, ...) \\
({ \\
	typeof(ptr) __ai_ptr = (ptr); \\
	typeof(oldp) __ai_oldp = (oldp); \\
EOF
[ -n "$kcsan_barrier" ] && printf "\t${kcsan_barrier}; \\\\\n"
cat <<EOF
	instrument_atomic_read_write(__ai_ptr, sizeof(*__ai_ptr)); \\
	instrument_read_write(__ai_oldp, sizeof(*__ai_oldp)); \\
	raw_${xchg}${order}(__ai_ptr, __ai_oldp, __VA_ARGS__); \\
})
EOF

	else

cat <<EOF
#define ${xchg}${order}(ptr, ...) \\
({ \\
	typeof(ptr) __ai_ptr = (ptr); \\
EOF
[ -n "$kcsan_barrier" ] && printf "\t${kcsan_barrier}; \\\\\n"
cat <<EOF
	instrument_atomic_read_write(__ai_ptr, sizeof(*__ai_ptr)); \\
	raw_${xchg}${order}(__ai_ptr, __VA_ARGS__); \\
})
EOF

	fi
}

cat << EOF
// SPDX-License-Identifier: GPL-2.0

// Generated by $0
// DO NOT MODIFY THIS FILE DIRECTLY

/*
 * This file provoides atomic operations with explicit instrumentation (e.g.
 * KASAN, KCSAN), which should be used unless it is necessary to avoid
 * instrumentation. Where it is necessary to aovid instrumenation, the
 * raw_atomic*() operations should be used.
 */
#ifndef _LINUX_ATOMIC_INSTRUMENTED_H
#define _LINUX_ATOMIC_INSTRUMENTED_H

#include <linux/build_bug.h>
#include <linux/compiler.h>
#include <linux/instrumented.h>

EOF

grep '^[a-z]' "$1" | while read name meta args; do
	gen_proto "${meta}" "${name}" "atomic" "int" ${args}
done

grep '^[a-z]' "$1" | while read name meta args; do
	gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
done

grep '^[a-z]' "$1" | while read name meta args; do
	gen_proto "${meta}" "${name}" "atomic_long" "long" ${args}
done


for xchg in "xchg" "cmpxchg" "cmpxchg64" "cmpxchg128" "try_cmpxchg" "try_cmpxchg64" "try_cmpxchg128"; do
	for order in "" "_acquire" "_release" "_relaxed"; do
		gen_xchg "${xchg}" "${order}"
		printf "\n"
	done
done

for xchg in "cmpxchg_local" "cmpxchg64_local" "cmpxchg128_local" "sync_cmpxchg" "try_cmpxchg_local" "try_cmpxchg64_local" "try_cmpxchg128_local"; do
	gen_xchg "${xchg}" ""
	printf "\n"
done

cat <<EOF

#endif /* _LINUX_ATOMIC_INSTRUMENTED_H */
EOF