scripts/atomic/gen-atomic-fallback.sh

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 ATOMICDIR=$(dirname $0)
   5
   6 . ${ATOMICDIR}/atomic-tbl.sh
   7
   8 #gen_template_fallback(template, meta, pfx, name, sfx, order, atomic, int, args...)
   9 gen_template_fallback()
  10 {
  11         local template="$1"; shift
  12         local meta="$1"; shift
  13         local pfx="$1"; shift
  14         local name="$1"; shift
  15         local sfx="$1"; shift
  16         local order="$1"; shift
  17         local atomic="$1"; shift
  18         local int="$1"; shift
  19
  20         local atomicname="arch_${atomic}_${pfx}${name}${sfx}${order}"
  21
  22         local ret="$(gen_ret_type "${meta}" "${int}")"
  23         local retstmt="$(gen_ret_stmt "${meta}")"
  24         local params="$(gen_params "${int}" "${atomic}" "$@")"
  25         local args="$(gen_args "$@")"
  26
  27         if [ ! -z "${template}" ]; then
  28                 printf "#ifndef ${atomicname}\n"
  29                 . ${template}
  30                 printf "#define ${atomicname} ${atomicname}\n"
  31                 printf "#endif\n\n"
  32         fi
  33 }
  34
  35 #gen_proto_fallback(meta, pfx, name, sfx, order, atomic, int, args...)
  36 gen_proto_fallback()
  37 {
  38         local meta="$1"; shift
  39         local pfx="$1"; shift
  40         local name="$1"; shift
  41         local sfx="$1"; shift
  42         local order="$1"; shift
  43
  44         local tmpl="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
  45         gen_template_fallback "${tmpl}" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "$@"
  46 }
  47
  48 #gen_basic_fallbacks(basename)
  49 gen_basic_fallbacks()
  50 {
  51         local basename="$1"; shift
  52 cat << EOF
  53 #define ${basename}_acquire ${basename}
  54 #define ${basename}_release ${basename}
  55 #define ${basename}_relaxed ${basename}
  56 EOF
  57 }
  58
  59 gen_proto_order_variant()
  60 {
  61         local meta="$1"; shift
  62         local pfx="$1"; shift
  63         local name="$1"; shift
  64         local sfx="$1"; shift
  65         local order="$1"; shift
  66         local atomic="$1"
  67
  68         local basename="arch_${atomic}_${pfx}${name}${sfx}"
  69
  70         printf "#define ${basename}${order} ${basename}${order}\n"
  71 }
  72
  73 #gen_proto_order_variants(meta, pfx, name, sfx, atomic, int, args...)
  74 gen_proto_order_variants()
  75 {
  76         local meta="$1"; shift
  77         local pfx="$1"; shift
  78         local name="$1"; shift
  79         local sfx="$1"; shift
  80         local atomic="$1"
  81
  82         local basename="arch_${atomic}_${pfx}${name}${sfx}"
  83
  84         local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
  85
  86         # If we don't have relaxed atomics, then we don't bother with ordering fallbacks
  87         # read_acquire and set_release need to be templated, though
  88         if ! meta_has_relaxed "${meta}"; then
  89                 gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
  90
  91                 if meta_has_acquire "${meta}"; then
  92                         gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
  93                 fi
  94
  95                 if meta_has_release "${meta}"; then
  96                         gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
  97                 fi
  98
  99                 return
 100         fi
 101
 102         printf "#ifndef ${basename}_relaxed\n"
 103
 104         if [ ! -z "${template}" ]; then
 105                 printf "#ifdef ${basename}\n"
 106         fi
 107
 108         gen_basic_fallbacks "${basename}"
 109
 110         if [ ! -z "${template}" ]; then
 111                 printf "#endif /* ${basename} */\n\n"
 112                 gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
 113                 gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
 114                 gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
 115                 gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
 116         fi
 117
 118         printf "#else /* ${basename}_relaxed */\n\n"
 119
 120         gen_template_fallback "${ATOMICDIR}/fallbacks/acquire"  "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
 121         gen_template_fallback "${ATOMICDIR}/fallbacks/release"  "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
 122         gen_template_fallback "${ATOMICDIR}/fallbacks/fence"  "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
 123
 124         printf "#endif /* ${basename}_relaxed */\n\n"
 125 }
 126
 127 gen_order_fallbacks()
 128 {
 129         local xchg="$1"; shift
 130
 131 cat <<EOF
 132
 133 #ifndef ${xchg}_acquire
 134 #define ${xchg}_acquire(...) \\
 135         __atomic_op_acquire(${xchg}, __VA_ARGS__)
 136 #endif
 137
 138 #ifndef ${xchg}_release
 139 #define ${xchg}_release(...) \\
 140         __atomic_op_release(${xchg}, __VA_ARGS__)
 141 #endif
 142
 143 #ifndef ${xchg}
 144 #define ${xchg}(...) \\
 145         __atomic_op_fence(${xchg}, __VA_ARGS__)
 146 #endif
 147
 148 EOF
 149 }
 150
 151 gen_xchg_fallbacks()
 152 {
 153         local xchg="$1"; shift
 154         printf "#ifndef ${xchg}_relaxed\n"
 155
 156         gen_basic_fallbacks ${xchg}
 157
 158         printf "#else /* ${xchg}_relaxed */\n"
 159
 160         gen_order_fallbacks ${xchg}
 161
 162         printf "#endif /* ${xchg}_relaxed */\n\n"
 163 }
 164
 165 gen_try_cmpxchg_fallback()
 166 {
 167         local cmpxchg="$1"; shift;
 168         local order="$1"; shift;
 169
 170 cat <<EOF
 171 #ifndef arch_try_${cmpxchg}${order}
 172 #define arch_try_${cmpxchg}${order}(_ptr, _oldp, _new) \\
 173 ({ \\
 174         typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \\
 175         ___r = arch_${cmpxchg}${order}((_ptr), ___o, (_new)); \\
 176         if (unlikely(___r != ___o)) \\
 177                 *___op = ___r; \\
 178         likely(___r == ___o); \\
 179 })
 180 #endif /* arch_try_${cmpxchg}${order} */
 181
 182 EOF
 183 }
 184
 185 gen_try_cmpxchg_fallbacks()
 186 {
 187         local cmpxchg="$1"; shift;
 188
 189         printf "#ifndef arch_try_${cmpxchg}_relaxed\n"
 190         printf "#ifdef arch_try_${cmpxchg}\n"
 191
 192         gen_basic_fallbacks "arch_try_${cmpxchg}"
 193
 194         printf "#endif /* arch_try_${cmpxchg} */\n\n"
 195
 196         for order in "" "_acquire" "_release" "_relaxed"; do
 197                 gen_try_cmpxchg_fallback "${cmpxchg}" "${order}"
 198         done
 199
 200         printf "#else /* arch_try_${cmpxchg}_relaxed */\n"
 201
 202         gen_order_fallbacks "arch_try_${cmpxchg}"
 203
 204         printf "#endif /* arch_try_${cmpxchg}_relaxed */\n\n"
 205 }
 206
 207 cat << EOF
 208 // SPDX-License-Identifier: GPL-2.0
 209
 210 // Generated by $0
 211 // DO NOT MODIFY THIS FILE DIRECTLY
 212
 213 #ifndef _LINUX_ATOMIC_FALLBACK_H
 214 #define _LINUX_ATOMIC_FALLBACK_H
 215
 216 #include <linux/compiler.h>
 217
 218 EOF
 219
 220 for xchg in "arch_xchg" "arch_cmpxchg" "arch_cmpxchg64"; do
 221         gen_xchg_fallbacks "${xchg}"
 222 done
 223
 224 for cmpxchg in "cmpxchg" "cmpxchg64"; do
 225         gen_try_cmpxchg_fallbacks "${cmpxchg}"
 226 done
 227
 228 grep '^[a-z]' "$1" | while read name meta args; do
 229         gen_proto "${meta}" "${name}" "atomic" "int" ${args}
 230 done
 231
 232 cat <<EOF
 233 #ifdef CONFIG_GENERIC_ATOMIC64
 234 #include <asm-generic/atomic64.h>
 235 #endif
 236
 237 EOF
 238
 239 grep '^[a-z]' "$1" | while read name meta args; do
 240         gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
 241 done
 242
 243 cat <<EOF
 244 #endif /* _LINUX_ATOMIC_FALLBACK_H */
 245 EOF