blob: 8b4329c331814dd3e21f564ce88059412dc2c049
| 1 | #!/bin/sh |
| 2 | # |
| 3 | # link vmlinux |
| 4 | # |
| 5 | # vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and |
| 6 | # $(KBUILD_VMLINUX_MAIN). Most are built-in.o files from top-level directories |
| 7 | # in the kernel tree, others are specified in arch/$(ARCH)/Makefile. |
| 8 | # Ordering when linking is important, and $(KBUILD_VMLINUX_INIT) must be first. |
| 9 | # |
| 10 | # vmlinux |
| 11 | # ^ |
| 12 | # | |
| 13 | # +-< $(KBUILD_VMLINUX_INIT) |
| 14 | # | +--< init/version.o + more |
| 15 | # | |
| 16 | # +--< $(KBUILD_VMLINUX_MAIN) |
| 17 | # | +--< drivers/built-in.o mm/built-in.o + more |
| 18 | # | |
| 19 | # +-< ${kallsymso} (see description in KALLSYMS section) |
| 20 | # |
| 21 | # vmlinux version (uname -v) cannot be updated during normal |
| 22 | # descending-into-subdirs phase since we do not yet know if we need to |
| 23 | # update vmlinux. |
| 24 | # Therefore this step is delayed until just before final link of vmlinux. |
| 25 | # |
| 26 | # System.map is generated to document addresses of all kernel symbols |
| 27 | |
| 28 | # Error out on error |
| 29 | set -e |
| 30 | |
| 31 | # Nice output in kbuild format |
| 32 | # Will be supressed by "make -s" |
| 33 | info() |
| 34 | { |
| 35 | if [ "${quiet}" != "silent_" ]; then |
| 36 | printf " %-7s %s\n" ${1} ${2} |
| 37 | fi |
| 38 | } |
| 39 | |
| 40 | # Thin archive build here makes a final archive with |
| 41 | # symbol table and indexes from vmlinux objects, which can be |
| 42 | # used as input to linker. |
| 43 | # |
| 44 | # Traditional incremental style of link does not require this step |
| 45 | # |
| 46 | # built-in.o output file |
| 47 | # |
| 48 | archive_builtin() |
| 49 | { |
| 50 | if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then |
| 51 | info AR built-in.o |
| 52 | rm -f built-in.o; |
| 53 | ${AR} rcsT${KBUILD_ARFLAGS} built-in.o \ |
| 54 | ${KBUILD_VMLINUX_INIT} \ |
| 55 | ${KBUILD_VMLINUX_MAIN} |
| 56 | |
| 57 | if [ -n "${CONFIG_LTO_CLANG}" ]; then |
| 58 | mv -f built-in.o built-in.o.tmp |
| 59 | ${LLVM_AR} rcsT${KBUILD_ARFLAGS} built-in.o $(${AR} t built-in.o.tmp) |
| 60 | rm -f built-in.o.tmp |
| 61 | fi |
| 62 | fi |
| 63 | } |
| 64 | |
| 65 | # If CONFIG_LTO_CLANG is selected, collect generated symbol versions into |
| 66 | # .tmp_symversions |
| 67 | modversions() |
| 68 | { |
| 69 | if [ -z "${CONFIG_LTO_CLANG}" ]; then |
| 70 | return |
| 71 | fi |
| 72 | |
| 73 | if [ -z "${CONFIG_MODVERSIONS}" ]; then |
| 74 | return |
| 75 | fi |
| 76 | |
| 77 | rm -f .tmp_symversions |
| 78 | |
| 79 | for a in built-in.o ${KBUILD_VMLINUX_LIBS}; do |
| 80 | for o in $(${AR} t $a); do |
| 81 | if [ -f ${o}.symversions ]; then |
| 82 | cat ${o}.symversions >> .tmp_symversions |
| 83 | fi |
| 84 | done |
| 85 | done |
| 86 | |
| 87 | echo "-T .tmp_symversions" |
| 88 | } |
| 89 | |
| 90 | # Link of vmlinux.o used for section mismatch analysis |
| 91 | # ${1} output file |
| 92 | modpost_link() |
| 93 | { |
| 94 | local objects |
| 95 | |
| 96 | if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then |
| 97 | objects="--whole-archive built-in.o" |
| 98 | else |
| 99 | objects="${KBUILD_VMLINUX_INIT} \ |
| 100 | --start-group \ |
| 101 | ${KBUILD_VMLINUX_MAIN} \ |
| 102 | --end-group" |
| 103 | fi |
| 104 | |
| 105 | if [ -n "${CONFIG_LTO_CLANG}" ]; then |
| 106 | # This might take a while, so indicate that we're doing |
| 107 | # an LTO link |
| 108 | info LTO vmlinux.o |
| 109 | else |
| 110 | info LD vmlinux.o |
| 111 | fi |
| 112 | |
| 113 | ${LD} ${LDFLAGS} -r -o ${1} $(modversions) ${objects} |
| 114 | } |
| 115 | |
| 116 | # If CONFIG_LTO_CLANG is selected, we postpone running recordmcount until |
| 117 | # we have compiled LLVM IR to an object file. |
| 118 | recordmcount() |
| 119 | { |
| 120 | if [ -z "${CONFIG_LTO_CLANG}" ]; then |
| 121 | return |
| 122 | fi |
| 123 | |
| 124 | if [ -n "${CONFIG_FTRACE_MCOUNT_RECORD}" ]; then |
| 125 | scripts/recordmcount ${RECORDMCOUNT_FLAGS} $* |
| 126 | fi |
| 127 | } |
| 128 | |
| 129 | # Link of vmlinux |
| 130 | # ${1} - optional extra .o files |
| 131 | # ${2} - output file |
| 132 | vmlinux_link() |
| 133 | { |
| 134 | local lds="${objtree}/${KBUILD_LDS}" |
| 135 | local objects |
| 136 | |
| 137 | if [ "${SRCARCH}" != "um" ]; then |
| 138 | local ld=${LD} |
| 139 | local ldflags="${LDFLAGS} ${LDFLAGS_vmlinux}" |
| 140 | |
| 141 | if [ -n "${LDFINAL_vmlinux}" ]; then |
| 142 | ld=${LDFINAL_vmlinux} |
| 143 | ldflags="${LDFLAGS_FINAL_vmlinux} ${LDFLAGS_vmlinux}" |
| 144 | fi |
| 145 | |
| 146 | if [[ -n "${CONFIG_THIN_ARCHIVES}" && -z "${CONFIG_LTO_CLANG}" ]]; then |
| 147 | objects="--whole-archive built-in.o ${1}" |
| 148 | else |
| 149 | objects="${KBUILD_VMLINUX_INIT} \ |
| 150 | --start-group \ |
| 151 | ${KBUILD_VMLINUX_MAIN} \ |
| 152 | --end-group \ |
| 153 | ${1}" |
| 154 | fi |
| 155 | |
| 156 | ${ld} ${ldflags} -o ${2} -T ${lds} ${objects} |
| 157 | else |
| 158 | if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then |
| 159 | objects="-Wl,--whole-archive built-in.o ${1}" |
| 160 | else |
| 161 | objects="${KBUILD_VMLINUX_INIT} \ |
| 162 | -Wl,--start-group \ |
| 163 | ${KBUILD_VMLINUX_MAIN} \ |
| 164 | -Wl,--end-group \ |
| 165 | ${1}" |
| 166 | fi |
| 167 | |
| 168 | ${CC} ${CFLAGS_vmlinux} -o ${2} \ |
| 169 | -Wl,-T,${lds} \ |
| 170 | ${objects} \ |
| 171 | -lutil -lrt -lpthread |
| 172 | rm -f linux |
| 173 | fi |
| 174 | } |
| 175 | |
| 176 | # Create ${2} .o file with all symbols from the ${1} object file |
| 177 | kallsyms() |
| 178 | { |
| 179 | info KSYM ${2} |
| 180 | local kallsymopt; |
| 181 | |
| 182 | if [ -n "${CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX}" ]; then |
| 183 | kallsymopt="${kallsymopt} --symbol-prefix=_" |
| 184 | fi |
| 185 | |
| 186 | if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then |
| 187 | kallsymopt="${kallsymopt} --all-symbols" |
| 188 | fi |
| 189 | |
| 190 | if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then |
| 191 | kallsymopt="${kallsymopt} --absolute-percpu" |
| 192 | fi |
| 193 | |
| 194 | if [ -n "${CONFIG_KALLSYMS_BASE_RELATIVE}" ]; then |
| 195 | kallsymopt="${kallsymopt} --base-relative" |
| 196 | fi |
| 197 | |
| 198 | local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ |
| 199 | ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" |
| 200 | |
| 201 | local afile="`basename ${2} .o`.S" |
| 202 | |
| 203 | ${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile} |
| 204 | ${CC} ${aflags} -c -o ${2} ${afile} |
| 205 | } |
| 206 | |
| 207 | # Create map file with all symbols from ${1} |
| 208 | # See mksymap for additional details |
| 209 | mksysmap() |
| 210 | { |
| 211 | ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} |
| 212 | } |
| 213 | |
| 214 | sortextable() |
| 215 | { |
| 216 | ${objtree}/scripts/sortextable ${1} |
| 217 | } |
| 218 | |
| 219 | # Delete output files in case of error |
| 220 | cleanup() |
| 221 | { |
| 222 | rm -f .old_version |
| 223 | rm -f .tmp_System.map |
| 224 | rm -f .tmp_kallsyms* |
| 225 | rm -f .tmp_version |
| 226 | rm -f .tmp_symversions |
| 227 | rm -f .tmp_vmlinux* |
| 228 | rm -f built-in.o |
| 229 | rm -f System.map |
| 230 | rm -f vmlinux |
| 231 | rm -f vmlinux.o |
| 232 | } |
| 233 | |
| 234 | on_exit() |
| 235 | { |
| 236 | if [ $? -ne 0 ]; then |
| 237 | cleanup |
| 238 | fi |
| 239 | } |
| 240 | trap on_exit EXIT |
| 241 | |
| 242 | on_signals() |
| 243 | { |
| 244 | exit 1 |
| 245 | } |
| 246 | trap on_signals HUP INT QUIT TERM |
| 247 | |
| 248 | # |
| 249 | # |
| 250 | # Use "make V=1" to debug this script |
| 251 | case "${KBUILD_VERBOSE}" in |
| 252 | *1*) |
| 253 | set -x |
| 254 | ;; |
| 255 | esac |
| 256 | |
| 257 | if [ "$1" = "clean" ]; then |
| 258 | cleanup |
| 259 | exit 0 |
| 260 | fi |
| 261 | |
| 262 | # We need access to CONFIG_ symbols |
| 263 | case "${KCONFIG_CONFIG}" in |
| 264 | */*) |
| 265 | . "${KCONFIG_CONFIG}" |
| 266 | ;; |
| 267 | *) |
| 268 | # Force using a file from the current directory |
| 269 | . "./${KCONFIG_CONFIG}" |
| 270 | esac |
| 271 | |
| 272 | # Update version |
| 273 | info GEN .version |
| 274 | if [ ! -r .version ]; then |
| 275 | rm -f .version; |
| 276 | echo 1 >.version; |
| 277 | else |
| 278 | mv .version .old_version; |
| 279 | expr 0$(cat .old_version) + 1 >.version; |
| 280 | fi; |
| 281 | |
| 282 | archive_builtin |
| 283 | |
| 284 | #link vmlinux.o |
| 285 | modpost_link vmlinux.o |
| 286 | |
| 287 | # modpost vmlinux.o to check for section mismatches |
| 288 | ${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o |
| 289 | |
| 290 | # final build of init/ |
| 291 | ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}" |
| 292 | |
| 293 | if [ -n "${CONFIG_LTO_CLANG}" ]; then |
| 294 | # Re-use vmlinux.o, so we can avoid the slow LTO link step in |
| 295 | # vmlinux_link |
| 296 | KBUILD_VMLINUX_INIT= |
| 297 | KBUILD_VMLINUX_MAIN=vmlinux.o |
| 298 | |
| 299 | # Call recordmcount if needed |
| 300 | recordmcount vmlinux.o |
| 301 | fi |
| 302 | |
| 303 | kallsymso="" |
| 304 | kallsyms_vmlinux="" |
| 305 | if [ -n "${CONFIG_KALLSYMS}" ]; then |
| 306 | |
| 307 | # kallsyms support |
| 308 | # Generate section listing all symbols and add it into vmlinux |
| 309 | # It's a three step process: |
| 310 | # 1) Link .tmp_vmlinux1 so it has all symbols and sections, |
| 311 | # but __kallsyms is empty. |
| 312 | # Running kallsyms on that gives us .tmp_kallsyms1.o with |
| 313 | # the right size |
| 314 | # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of |
| 315 | # the right size, but due to the added section, some |
| 316 | # addresses have shifted. |
| 317 | # From here, we generate a correct .tmp_kallsyms2.o |
| 318 | # 2a) We may use an extra pass as this has been necessary to |
| 319 | # woraround some alignment related bugs. |
| 320 | # KALLSYMS_EXTRA_PASS=1 is used to trigger this. |
| 321 | # 3) The correct ${kallsymso} is linked into the final vmlinux. |
| 322 | # |
| 323 | # a) Verify that the System.map from vmlinux matches the map from |
| 324 | # ${kallsymso}. |
| 325 | |
| 326 | kallsymso=.tmp_kallsyms2.o |
| 327 | kallsyms_vmlinux=.tmp_vmlinux2 |
| 328 | |
| 329 | # step 1 |
| 330 | vmlinux_link "" .tmp_vmlinux1 |
| 331 | kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o |
| 332 | |
| 333 | # step 2 |
| 334 | vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2 |
| 335 | kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o |
| 336 | |
| 337 | # step 2a |
| 338 | if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then |
| 339 | kallsymso=.tmp_kallsyms3.o |
| 340 | kallsyms_vmlinux=.tmp_vmlinux3 |
| 341 | |
| 342 | vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3 |
| 343 | |
| 344 | kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o |
| 345 | fi |
| 346 | fi |
| 347 | |
| 348 | info LD vmlinux |
| 349 | vmlinux_link "${kallsymso}" vmlinux |
| 350 | |
| 351 | if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then |
| 352 | info SORTEX vmlinux |
| 353 | sortextable vmlinux |
| 354 | fi |
| 355 | |
| 356 | info SYSMAP System.map |
| 357 | mksysmap vmlinux System.map |
| 358 | |
| 359 | # step a (see comment above) |
| 360 | if [ -n "${CONFIG_KALLSYMS}" ]; then |
| 361 | mksysmap ${kallsyms_vmlinux} .tmp_System.map |
| 362 | |
| 363 | if ! cmp -s System.map .tmp_System.map; then |
| 364 | echo >&2 Inconsistent kallsyms data |
| 365 | echo >&2 Try "make KALLSYMS_EXTRA_PASS=1" as a workaround |
| 366 | exit 1 |
| 367 | fi |
| 368 | fi |
| 369 | |
| 370 | # We made a new kernel - delete old version file |
| 371 | rm -f .old_version |
| 372 |