scripts/lttng-modules/param-build.sh

   1 #!/bin/bash
   2 #
   3 # Copyright (C) 2016-2019 Michael Jeanson <mjeanson@efficios.com>
   4 #
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 set -exu
  19
  20 # Parameters
  21 platforms=${platforms:-}
  22 # Derive arch from label if it isn't set
  23 if [ -z "${arch:-}" ] ; then
  24     # Labels may be platform specific, eg. jammy-amd64, deb12-armhf
  25     regex='[[:alnum:]]+-([[:alnum:]]+)'
  26     if [[ "${platforms}" =~ ${regex} ]] ; then
  27         arch="${BASH_REMATCH[1]}"
  28     else
  29         arch="${platforms:-}"
  30     fi
  31 fi
  32
  33 cross_arch=${cross_arch:-}
  34 ktag=${ktag:-}
  35 kgitrepo=${kgitrepo:-}
  36 mversion=${mversion:-}
  37 mgitrepo=${mgitrepo:-}
  38 make_args=()
  39
  40 DEBUG=${DEBUG:-}
  41
  42 ## FUNCTIONS ##
  43
  44 # Kernel version compare functions
  45 verlte() {
  46     [  "$1" = "$(printf '%s\n%s' "$1" "$2" | sort -V | head -n1)" ]
  47 }
  48
  49 verlt() {
  50     # shellcheck disable=SC2015
  51     [ "$1" = "$2" ] && return 1 || verlte "$1" "$2"
  52 }
  53
  54 vergte() {
  55     [  "$1" = "$(printf '%s\n%s' "$1" "$2" | sort -V | tail -n1)" ]
  56 }
  57
  58 vergt() {
  59     # shellcheck disable=SC2015
  60     [ "$1" = "$2" ] && return 1 || vergte "$1" "$2"
  61 }
  62
  63 git_clone_modules_sources() {
  64     mkdir -p "$MODULES_GIT_DIR"
  65
  66     # If the version starts with "refs/", checkout the specific git ref, otherwise treat it
  67     # as a branch name.
  68     if [ "${mversion:0:5}" = "refs/" ]; then
  69         git clone --no-tags --depth=1 "${mgitrepo}" "$MODULES_GIT_DIR"
  70         (cd "$MODULES_GIT_DIR" && git fetch origin "${mversion}" && git checkout FETCH_HEAD)
  71     else
  72         git clone --no-tags --depth=1 -b "${mversion}" "${mgitrepo}" "$MODULES_GIT_DIR"
  73     fi
  74 }
  75
  76 # Checkout a shallow kernel tree of the specified tag
  77 git_clone_linux_sources() {
  78     mkdir -p "$LINUX_GIT_DIR"
  79     git clone --depth=1 -b "${ktag}" --reference "$LINUX_GIT_REF_REPO_DIR" "${kgitrepo}" "$LINUX_GIT_DIR"
  80 }
  81
  82
  83 # Export the kernel sources from the git repo
  84 git_export_linux_sources() {
  85     cd "$LINUX_GIT_DIR"
  86     git archive "${ktag}" | tar -x -C "$LINUX_SRCOBJ_DIR"
  87 }
  88
  89
  90 # Upload the tar archive to the object store
  91 upload_archive_obj() {
  92     s3cmd -c "$WORKSPACE/.s3cfg" put "$WORKSPACE/$obj_name" "$obj_url_prefix/"
  93     rm -f "$WORKSPACE/$obj_name"
  94 }
  95
  96
  97 extract_archive_obj() {
  98     tar -xf "$WORKSPACE/$obj_name" -C "$LINUX_OBJ_DIR" -I pbzip2
  99     rm -f "$WORKSPACE/$obj_name"
 100 }
 101
 102
 103 tar_archive_obj() {
 104     cd "$LINUX_OBJ_DIR"
 105     tar -cf "$WORKSPACE/$obj_name" -I pbzip2 .
 106     cd -
 107 }
 108
 109 list_gccs() {
 110     local gccs
 111     gccs=()
 112     IFS=: read -r -a path_array <<< "$PATH"
 113     while read -r gcc ; do
 114         gccs+=("$gcc")
 115     done < <(find "${path_array[@]}" -maxdepth 1 -regex '.*/gcc-[0-9\.]+$' -printf '%f\n' | sort -t- -k2 -V -r)
 116     echo "${gccs[@]}"
 117 }
 118
 119 # Find the most recent GCC version supported by the kernel sources
 120 select_compiler() {
 121     local selected_cc
 122
 123     cd "$LINUX_SRCOBJ_DIR"
 124
 125     kversion=$(make -s kernelversion)
 126
 127     set +e
 128
 129     for cc in $(list_gccs) ; do
 130         if "${CROSS_COMPILE:-}${cc}" -I include/ -D__LINUX_COMPILER_H -D__LINUX_COMPILER_TYPES_H -E include/linux/compiler-gcc.h; then
 131             cc_version=$(echo "${cc}" | cut -d'-' -f2)
 132             if { verlt "${kversion}" "5.17"; } && { vergt "${cc_version}" "11"; } ; then
 133                 # Using gcc-12+ with '-Wuse-after-free' breaks the build of older
 134                 # kernels (in particular, objtool). Some releases on LTS
 135                 # branches between 4.x and 5.15 can be built with gcc-12.
 136                 # @see https://lore.kernel.org/lkml/20494.1643237814@turing-police/
 137                 # @see https://gitlab.com/linux-kernel/stable/-/commit/52a9dab6d892763b2a8334a568bd4e2c1a6fde66
 138                 continue
 139             fi
 140         selected_cc="$cc"
 141         break
 142       fi
 143     done
 144
 145     set -e
 146
 147     # Force gcc-4.8 for kernels before 4.4
 148     if { verlt "$kversion" "4.4"; }; then
 149         selected_cc='gcc-4.8'
 150     fi
 151
 152     if [ -z "$selected_cc" ]; then
 153       echo "Found no suitable compiler."
 154       exit 1
 155     fi
 156
 157     _KAFLAGS=()
 158     _KCFLAGS=()
 159     _KCPPFLAGS=()
 160     _HOSTCFLAGS=()
 161     if [ "$selected_cc" != "gcc-4.8" ]; then
 162         # Older kernel Makefiles do not expect the compiler to default to PIE
 163         _KAFLAGS+=(-fno-pie)
 164         _KCFLAGS+=(
 165             -fno-pie
 166             -no-pie
 167             -fno-stack-protector
 168         )
 169         _KCPPFLAGS+=(-fno-pie)
 170     fi
 171
 172     selected_cc_version="$(echo "${selected_cc}" | cut -d'-' -f2)"
 173     if { vergte "${selected_cc_version}" "10"; } && { verlt "${kversion}" "5.10"; } ; then
 174         # gcc-10 changed the default from '-fcommon' to '-fno-common', which
 175         # causes a linker failure. '-fcommon' can be set on the HOSTCFLAGS
 176         # to avoid the issue.
 177         # @see https://gitlab.com/linux-kernel/stable/-/commit/e33a814e772cdc36436c8c188d8c42d019fda639
 178         _HOSTCFLAGS+=(-fcommon)
 179     fi
 180
 181     if [ "${cross_arch:-}" == "armhf" ] ; then
 182         if { verlt "${kversion}" "5.14"; } ; then
 183             # Work-around for producing instructions that aren't valid for the
 184             # default architectures.
 185             # Eg. Error: selected processor does not support `cpsid i' in ARM mode
 186             _KCFLAGS+=(-march=armv7-a -mfpu=vfpv3-d16)
 187             _KCPPFLAGS+=(-march=armv7-a -mfpu=vfpv3-d16)
 188         fi
 189     fi
 190
 191     if { vergt "${selected_cc_version}" "8"; } && { vergte "${kversion}" "4.15"; } && { verlt "${kversion}" "4.17"; } ; then
 192         # This was added to -Wall in gcc 9 but some kernels do not include the fixes
 193         # @see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88583
 194         _KCFLAGS+=(-Wno-error=packed-not-aligned)
 195     fi
 196
 197     export KAFLAGS="${_KAFLAGS[*]}"
 198     export KCFLAGS="${_KCFLAGS[*]}"
 199     export KCPPFLAGS="${_KCPPFLAGS[*]}"
 200     export HOSTCFLAGS="${_HOSTCFLAGS[*]}"
 201     export CC="${CROSS_COMPILE:-}${selected_cc}"
 202     export HOSTCC="${selected_cc}"
 203
 204     make_args=(
 205         CC="${CC}"
 206         HOSTCC="${HOSTCC}"
 207         HOSTCFLAGS="${HOSTCFLAGS:-}"
 208     )
 209     if [ -n "${DEBUG}" ] ; then
 210         make_args+=(
 211             V=1
 212         )
 213     fi
 214     cd -
 215 }
 216
 217 patch_linux_kernel() {
 218     local commit_hash
 219     commit_hash="$1"
 220     set +e
 221     git -C "${LINUX_GIT_REF_REPO_DIR}" format-patch -n1 --stdout "${commit_hash}" | patch -p1
 222     set -e
 223     if [ "$?" -gt 1 ] ; then
 224         echo "Serious issue patching"
 225         exit 1
 226     fi
 227 }
 228
 229 build_linux_kernel() {
 230     cd "$LINUX_SRCOBJ_DIR"
 231
 232     kversion=$(make -s kernelversion "${make_args[@]}")
 233     pahole_version="$(pahole --version | tr -d 'v')"
 234
 235     if { verlt "${kversion}" "3.3"; } && [ "${vanilla_config}" = "imx_v6_v7_defconfig" ] ; then
 236         # imx_v6_v7 didn't exist before 06965c39b4c63933fa0a1cde2237ef85477c5655
 237         if { verlt "${kversion}" "3.2"; } ; then
 238             vanilla_config='mx5_defconfig'
 239         else
 240             vanilla_config='mx51_defconfig'
 241         fi
 242     fi
 243
 244     if { verlt "${kversion}" "3.13"; } && [ "${vanilla_config}" = "pseries_le_defconfig" ] ; then
 245         # pseries_le_deconfig was introduced in f53e462e907cbaed29c49c0f10f5b8f614e1bf1d
 246         vanilla_config='pseries_defconfig'
 247     fi
 248
 249     # Generate kernel configuration
 250     case "$ktag" in
 251       Ubuntu*)
 252         if [ "${cross_arch}" = "powerpc" ]; then
 253           if vergte "${kversion}" "4.10"; then
 254             echo "Ubuntu removed big endian powerpc configuration from kernel >= 4.10. Don't try to build it."
 255             exit 0
 256           fi
 257         fi
 258
 259         # Disable riscv64 config generation, we don't have a toolchain on bionic
 260         sed -i 's/riscv64 //' debian.master/etc/kernelconfig
 261
 262         fakeroot debian/rules clean KW_DEFCONFIG_DIR=.
 263
 264         # Hack for kernel Ubuntu-hwe-5.8
 265         # The debian/control file is produced by the clean target above, so this
 266         # check needs to happen afterwards.
 267         if [ ! -f "debian/compat" ] && ! grep -q debhelper-compat debian/control; then
 268             echo "10" > "debian/compat"
 269         fi
 270
 271         # genconfigs check can fail in certain cases, eg. when a more recent
 272         # compiler exposes kernel configuration flags which aren't set in the
 273         # Ubuntu annotations.
 274         # In any case, the configuration will be updated with any missing values
 275         # later in our build script.
 276         fakeroot debian/rules genconfigs KW_DEFCONFIG_DIR=. do_skip_checks=true
 277         cp CONFIGS/"${ubuntu_config}" .config
 278         ;;
 279
 280       *)
 281         # Force 32bit build on i386, default is 64bit
 282         if [ "$arch" = "i386" ]; then
 283             export ARCH="i386"
 284         fi
 285
 286         make "${vanilla_config}" "${make_args[@]}"
 287         ;;
 288     esac
 289
 290     if [ "${vanilla_config}" = "pseries_defconfig" ] && [ "${cross_arch}" = "ppc64el" ] ; then
 291         # @see diff <(git show v3.13:arch/powerpc/configs/pseries_defconfig) <(git show v3.13:arch/powerpc/configs/pseries_le_defconfig)
 292         scripts/config --enable CONFIG_CPU_LITTLE_ENDIAN
 293         scripts/config --enable CONFIG_CMA
 294         scripts/config --disable CONFIG_XMON_DEFAULT
 295         # scripts/config --disable CONFIG_VIRTUALIZATION
 296         # scripts/config --disable CONFIG_KVM_BOOK3S_64
 297         scripts/config --disable CONFIG_KVM_BOOK3S_64_HV
 298     fi
 299
 300     # oldnoconfig was renamed in 4.19
 301     if vergte "$kversion" "4.19"; then
 302         update_conf_target="olddefconfig"
 303     else
 304         update_conf_target="oldnoconfig"
 305     fi
 306
 307     # Fix 'defined(@array)' was removed from recent perl
 308     if [ -f "kernel/timeconst.pl" ]; then
 309       sed -i 's/defined(\@\(.*\))/@\1/' kernel/timeconst.pl
 310     fi
 311
 312     # Fix syntax of inline assembly which is confused with C++11 raw strings on gcc >= 5
 313     if [ "$HOSTCC" != "gcc-4.8" ]; then
 314       if [ -f "arch/x86/kvm/svm.c" ]; then
 315         sed -i 's/ R"/ R "/g; s/"R"/" R "/g' arch/x86/kvm/svm.c
 316       fi
 317
 318       if [ -f "arch/x86/kvm/vmx.c" ]; then
 319         sed -i 's/ R"/ R "/g; s/"R"/" R "/g' arch/x86/kvm/vmx.c
 320       fi
 321     fi
 322
 323     if { verlt "${kversion}" "5.11"; } && { vergte "${kversion}" "4.10"; } ; then
 324         # Binutils > 2.35 strips empty symbol tables, causing obltool to fail
 325         # in certain cases when files are empty.
 326         # @see https://gitlab.com/linux-kernel/stable/-/commit/1d489151e9f9d1647110277ff77282fe4d96d09b
 327         #
 328         # There doesn't seem to be any LD/AS/AR flags to control this behaviour,
 329         # therefore patching tools/objtool/elf.c is attempted.
 330         patch_linux_kernel 1d489151e9f9d1647110277ff77282fe4d96d09b
 331         if { verlt "${kversion}" "4.18"; } ; then
 332             patch_linux_kernel e81e0724432542af8d8c702c31e9d82f57b1ff31
 333         fi
 334     fi
 335
 336     if { vergt "${selected_cc_version}" "7"; } && { vergte "${kversion}" "4.15"; } && { verlt "${kversion}" "4.17"; } ; then
 337         # Builds fail due to -Werror=restrict in pager.o and str_error_r.o
 338         if { verlt "${kversion}" "4.16"; } ; then
 339             # This is patched since objtool's Makefile doesn't respect HOSTCFLAGS
 340             # @see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad343a98e74e85aa91d844310e797f96fee6983b
 341             patch_linux_kernel ad343a98e74e85aa91d844310e797f96fee6983b
 342         fi
 343         if { verlt "${kversion}" "4.17"; } ; then
 344             # This is patched since objtool's Makefile doesn't respect HOSTCFLAGS
 345             # @see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=854e55ad289ef8888e7991f0ada85d5846f5afb9
 346             patch_linux_kernel 854e55ad289ef8888e7991f0ada85d5846f5afb9
 347         fi
 348
 349     fi
 350
 351     if { vergt "${selected_cc_version}" "9"; } && { verlt "${kversion}" "5.6"; } ; then
 352         # Duplicate decalarations of __force_order
 353         # @see https://gitlab.com/linux-kernel/stable/-/commit/df6d4f9db79c1a5d6f48b59db35ccd1e9ff9adfc
 354         patch_linux_kernel df6d4f9db79c1a5d6f48b59db35ccd1e9ff9adfc
 355         # However, kaslr_64.c doesn't exit in 4.15, 4.16, it's named pagetable.c
 356         if [ -f arch/x86/boot/compressed/pagetable.c ] ; then
 357             sed -i '/^unsigned long __force_order;$/d' arch/x86/boot/compressed/pagetable.c
 358         fi
 359     fi
 360
 361     if { vergte "${kversion}" "4.15"; } && { verlt "${kversion}" "4.18"; } ; then
 362         # Some old kernels fail to build when make is too new
 363         # @see https://gitlab.com/linux-kernel/stable/-/commit/9feeb638cde083c737e295c0547f1b4f28e99583
 364         patch_linux_kernel 9564a8cf422d7b58f6e857e3546d346fa970191e
 365         # @see https://gitlab.com/linux-kernel/stable/-/commit/9feeb638cde083c737e295c0547f1b4f28e99583
 366         patch_linux_kernel 9feeb638cde083c737e295c0547f1b4f28e99583
 367     fi
 368
 369     if { vergte "${kversion}" "4.12"; } && { verlt "${kversion}" "4.19"; } ; then
 370         # Old kernels can fail to build while on newer host kernels with errors
 371         # such as:
 372         #   In file included from scripts/selinux/genheaders/genheaders.c:19:
 373         #   ./security/selinux/include/classmap.h:249:2: error: #error New address family defined, please update secclass_map.
 374         # @see https://gitlab.com/linux-kernel/stable/-/commit/dfbd199a7cfe3e3cd8531e1353cdbd7175bfbc5e
 375         #
 376         patch_linux_kernel dfbd199a7cfe3e3cd8531e1353cdbd7175bfbc5e
 377     fi
 378
 379     if { vergte "${kversion}" "3.18"; } && { verlt "${kversion}" "4.4"; } ; then
 380         # Compatibility with binutils >= ~ 2.31
 381         patch_linux_kernel b21ebf2fb4cde1618915a97cc773e287ff49173e
 382     fi
 383
 384     # The above patch only partially applies linux 3.17, and has been, so a
 385     # rebased version is used instead.
 386     if { vergte "${kversion}" "3.17"; } && { verlt "${kversion}" "3.18"; } ; then
 387         cat <<'EOF' | patch -p1
 388 diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
 389 index 48598105..0652c5b6 100644
 390 --- a/arch/x86/kernel/machine_kexec_64.c
 391 +++ b/arch/x86/kernel/machine_kexec_64.c
 392 @@ -516,6 +516,7 @@ int arch_kexec_apply_relocations_add(const Elf64_Ehdr *ehdr,
 393                                 goto overflow;
 394                         break;
 395                 case R_X86_64_PC32:
 396 +               case R_X86_64_PLT32:
 397                         value -= (u64)address;
 398                         *(u32 *)location = value;
 399                         break;
 400 diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
 401 index e69f9882..7c6bc9fe 100644
 402 --- a/arch/x86/kernel/module.c
 403 +++ b/arch/x86/kernel/module.c
 404 @@ -180,6 +180,7 @@ int apply_relocate_add(Elf64_Shdr *sechdrs,
 405                                 goto overflow;
 406                         break;
 407                 case R_X86_64_PC32:
 408 +               case R_X86_64_PLT32:
 409                         val -= (u64)loc;
 410                         *(u32 *)loc = val;
 411  #if 0
 412 diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
 413 index bbb1d225..8deeacbc 100644
 414 --- a/arch/x86/tools/relocs.c
 415 +++ b/arch/x86/tools/relocs.c
 416 @@ -763,6 +763,7 @@ static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
 417         switch (r_type) {
 418         case R_X86_64_NONE:
 419         case R_X86_64_PC32:
 420 +       case R_X86_64_PLT32:
 421                 /*
 422                  * NONE can be ignored and PC relative relocations don't
 423                  * need to be adjusted.
 424 EOF
 425     fi
 426
 427     if ( { vergte "${kversion}" "3.14"; } && { verlt "${kversion}" "4.4"; } ) ||
 428        ( { vergte "${kversion}" "4.15"; } && { verlt "${kversion}" "4.17"; } ); then
 429         # While the original motivation of this patch is for fixing builds using
 430         # clang, the same error occurs between linux >= 3.14 and < 4.4, and in
 431         # 4.15, 4.16.
 432         #
 433         # This patch only partially applies due to changes in kernel/Makefile,
 434         # so a supplementary patch is needed
 435         #
 436         # Without this patch, builds fail with
 437         #   Cannot find symbol for section 2: .text.
 438         #   kernel/elfcore.o: failed
 439         #
 440         # @see https://github.com/linuxppc/issues/issues/388
 441         # @see https://lore.kernel.org/lkml/20201204165742.3815221-2-arnd@kernel.org/
 442         #
 443         patch_linux_kernel 6e7b64b9dd6d96537d816ea07ec26b7dedd397b9
 444         if grep -q elfcore.o kernel/Makefile ; then
 445             sed -i '/^.* += elfcore.o$/d' kernel/Makefile
 446         fi
 447     fi
 448     # Same as above for the v4.4 branch
 449     if ( { vergte "${kversion}" "4.4"; } && { verlt "${kversion}" "4.4.257"; } ); then
 450         patch_linux_kernel 3140b0740b31cc63cf2ee08bc3f746b423eb068d
 451         if grep -q elfcore.o kernel/Makefile ; then
 452             sed -i '/^.* += elfcore.o$/d' kernel/Makefile
 453         fi
 454     fi
 455
 456     # Newer binutils don't accept 3 operand 'cmp' instructions on ppc64
 457     # Convert them to 'cmpw' which was previously done silently
 458     if verlt "$kversion" "4.9"; then
 459             find arch/powerpc/ -name "*.S" -print0 | xargs -0 sed -i "s/\(cmp\)\(\s\+[a-zA-Z0-9]\+,\s*[a-zA-Z0-9]\+,\s*[a-zA-Z0-9]\+\)/cmpw\2/"
 460             find arch/powerpc/ -name "*.S" -print0 | xargs -0 sed -i "s/\(cmpli\)\(\s\+[a-zA-Z0-9]\+,\s*[a-zA-Z0-9]\+,\s*[a-zA-Z0-9]\+\)/cmplwi\2/"
 461             sed -i "s/\$pie \-o \"\$ofile\"/\$pie --no-dynamic-linker -o \"\$ofile\"/" arch/powerpc/boot/wrapper
 462     fi
 463
 464     # Fix a typo in v2.6.36.x
 465     if [ -f "arch/x86/kernel/entry_64.S" ]; then
 466       sed -i 's/END(do_hypervisor_callback)/END(xen_do_hypervisor_callback)/' arch/x86/kernel/entry_64.S
 467     fi
 468
 469     # Fix compiler switch in vdso Makefile for 2.6.36 to 2.6.36.2
 470     if { vergte "$kversion" "2.6.36" && verlte "$kversion" "2.6.36.3"; }; then
 471       sed -i 's/-m elf_x86_64/-m64/' arch/x86/vdso/Makefile
 472       sed -i 's/-m elf_i386/-m32/' arch/x86/vdso/Makefile
 473     fi
 474
 475     # Fix kernel < 3.0 with gcc >= 4.7
 476     if verlt "$kversion" "3.0"; then
 477       sed -i '/linux\/compiler.h/a #include <linux\/linkage.h> \/* For asmregparm *\/' arch/x86/include/asm/ptrace.h
 478       sed -i 's/extern long syscall_trace_enter/extern asmregparm long syscall_trace_enter/' arch/x86/include/asm/ptrace.h
 479       sed -i 's/extern void syscall_trace_leave/extern asmregparm void syscall_trace_leave/' arch/x86/include/asm/ptrace.h
 480       echo "header-y += linkage.h" >> include/linux/Kbuild
 481     fi
 482
 483     if [ "${cross_arch}" = "powerpc" ] ; then
 484         if { vergte "${kversion}" "4.15"; } && { verlt "${kversion}" "4.16"; } ; then
 485             # Avoid register errors such as
 486             # aes_generic.c:(.text+0x4e0): undefined reference to `_restgpr_31_x'
 487             # @see https://gitlab.com/linux-kernel/stable/-/commit/148b974deea927f5dbb6c468af2707b488bfa2de
 488             make_args+=(
 489                 CFLAGS_aes_generic.o=''
 490             )
 491         fi
 492     fi
 493
 494     if [ "$(scripts/config --state CONFIG_DEBUG_INFO_BTF)" == "y" ] &&
 495            { vergte "${pahole_version}" "1.24"; } &&
 496            { vergte "${kversion}" "5.10"; } && { verlt "${kversion}" "6.0"; } ;then
 497         # Some kernels Eg. Ubuntu-hwe-5.13-5.13.0-52.59_20.04.1
 498         # fail with the following error:
 499         #   BTFIDS  vmlinux
 500         #   FAILED: load BTF from vmlinux: Invalid argument
 501         #
 502         # When CONFIG_DEBUG_INFO_BTF is set, certain versions of pahole require
 503         # `--skip_encoding_btf_enum64` to be passed as the kernel doesn't define
 504         # BTF_KIND_ENUM64.
 505         #
 506         # Introduced in 341dfcf8d78eaa3a2dc96dea06f0392eb2978364 (~v5.10)
 507         # @see https://lore.kernel.org/bpf/20220825171620.cioobudss6ovyrkc@altlinux.org/t/
 508         #
 509         if [ -f "scripts/pahole-flags.sh" ] ; then
 510             sed -i 's/ -J ${PAHOLE_FLAGS} / -J ${PAHOLE_FLAGS} --skip_encoding_btf_enum64 /' scripts/link-vmlinux.sh
 511         else
 512             sed -i 's/ -J ${extra_paholeopt} / -J ${extra_paholeopt} --skip_encoding_btf_enum64 /' scripts/link-vmlinux.sh
 513         fi
 514     fi
 515
 516     # GCC 4.8
 517     if [ "$HOSTCC" == "gcc-4.8" ]; then
 518         scripts/config --disable CONFIG_CC_STACKPROTECTOR_STRONG
 519         scripts/config --disable CONFIG_PPC_OF_BOOT_TRAMPOLINE
 520     fi
 521
 522     # Don't try to sign modules
 523     scripts/config --disable CONFIG_MODULE_SIG
 524
 525     # Disable kernel stack frame correctness validation, introduced in 4.6.0 and currently fails
 526     scripts/config --disable CONFIG_STACK_VALIDATION
 527
 528     # Cause problems with inline assembly on i386
 529     scripts/config --disable CONFIG_DEBUG_SECTION_MISMATCH
 530
 531     # Don't build samples, they are broken on some kernel releases
 532     scripts/config --disable CONFIG_SAMPLES
 533     scripts/config --disable CONFIG_BUILD_DOCSRC
 534
 535     # Disable kcov
 536     scripts/config --disable CONFIG_KCOV
 537
 538     # Broken on some RT kernels
 539     scripts/config --disable CONFIG_HYPERV
 540
 541     # Broken drivers
 542     scripts/config --disable CONFIG_RAPIDIO_TSI721
 543     scripts/config --disable CONFIG_SGI_XP
 544     scripts/config --disable CONFIG_MFD_WM8994
 545     scripts/config --disable CONFIG_DRM_RADEON
 546     scripts/config --disable CONFIG_SND_SOC_WM5100
 547     # More recent compiler optimizations (from gcc 8 onwards )expose build errors
 548     # with netronome on older kernels.
 549     # Observed in 4.11-rt, 4.15-4.17, 5.0-rt - 5.16-rt
 550     # It seems easier to disable the driver than to attempt patching.
 551     # Eg.
 552     #   In function ‘ur_load_imm_any’,
 553     #   inlined from ‘jeq_imm’ at drivers/net/ethernet/netronome/nfp/bpf/jit.c:3146:13:
 554     #   ./include/linux/compiler.h:350:45: error: call to ‘__compiletime_assert_1062’ declared with attribute error: FIELD_FIT: value too large for the field
 555     #   350 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
 556     #
 557     scripts/config --disable CONFIG_NET_VENDOR_NETRONOME
 558     # Eg.
 559     #  In function ‘memcpy’,
 560     #  inlined from ‘kszphy_get_strings’ at drivers/net/phy/micrel.c:664:3:
 561     #  ./include/linux/string.h:305:25: error: call to ‘__read_overflow2’ declared with attribute error: detected read beyond size of object passed as 2nd parameter
 562     #  305 |                         __read_overflow2();
 563     #      |                         ^~~~~~~~~~~~~~~~~~
 564     #  make[3]: *** [scripts/Makefile.build:308: drivers/net/phy/micrel.o] Error 1
 565     #
 566     scripts/config --disable CONFIG_MICREL_PHY
 567
 568
 569     # IGBVF won't build with recent gcc on 2.6.38.x
 570     if { vergte "$kversion" "2.6.37" && verlt "$kversion" "2.6.38"; }; then
 571       scripts/config --disable CONFIG_IGBVF
 572     fi
 573
 574     # Don't fail the build on warnings
 575     scripts/config --disable CONFIG_WERROR
 576     scripts/config --enable CONFIG_PPC_DISABLE_WERROR
 577
 578     # Set required options
 579     scripts/config --enable CONFIG_TRACEPOINTS
 580     scripts/config --enable CONFIG_KALLSYMS
 581     scripts/config --enable CONFIG_HIGH_RES_TIMERS
 582     scripts/config --enable CONFIG_KPROBES
 583     scripts/config --enable CONFIG_FTRACE
 584     scripts/config --enable CONFIG_BLK_DEV_IO_TRACE
 585     scripts/config --enable CONFIG_KALLSYMS_ALL
 586     scripts/config --enable CONFIG_HAVE_SYSCALL_TRACEPOINTS
 587     scripts/config --enable CONFIG_PERF_EVENTS
 588     scripts/config --enable CONFIG_EVENT_TRACING
 589     scripts/config --enable CONFIG_KRETPROBES
 590
 591     if [ -n "${DEBUG}" ] ; then
 592         cat .config
 593     fi
 594
 595     make "$update_conf_target" "${make_args[@]}"
 596     make -j"$NPROC" "${make_args[@]}"
 597
 598     krelease=$(make -s kernelrelease "${make_args[@]}")
 599
 600     # Save the kernel and modules
 601     mkdir -p "$LINUX_INSTOBJ_DIR/boot"
 602     make INSTALL_MOD_PATH="$LINUX_INSTOBJ_DIR" INSTALL_MOD_STRIP=1 modules_install "${make_args[@]}"
 603     make INSTALL_MOD_PATH="$LINUX_INSTOBJ_DIR" INSTALL_PATH="$LINUX_INSTOBJ_DIR/boot" install "${make_args[@]}"
 604     rm -f "$LINUX_INSTOBJ_DIR/lib/modules/${krelease}/source" "$LINUX_INSTOBJ_DIR/lib/modules/${krelease}/build"
 605     ln -s ../../../../sources "$LINUX_INSTOBJ_DIR/lib/modules/${krelease}/source"
 606     ln -s ../../../../sources "$LINUX_INSTOBJ_DIR/lib/modules/${krelease}/source"
 607 }
 608
 609
 610 extract_distro_headers() {
 611
 612     # Enter linux source dir
 613     cd "${LINUX_SRCOBJ_DIR}"
 614
 615
 616     # For RT kernels, copy version file
 617     if [ -s localversion-rt ]; then
 618         cp -a localversion-rt "${LINUX_HDROBJ_DIR}"
 619     fi
 620
 621     # Copy all Makefile related stuff
 622     find . -path './include/*' -prune \
 623         -o -path './scripts/*' -prune -o -type f \
 624         \( -name 'Makefile*' -o -name 'Kconfig*' -o -name 'Kbuild*' -o \
 625             -name '*.sh' -o -name '*.pl' -o -name '*.lds' \) \
 626         -print | cpio -pd --preserve-modification-time "${LINUX_HDROBJ_DIR}"
 627
 628     # Copy base scripts and include dirs
 629     cp -a scripts include "${LINUX_HDROBJ_DIR}"
 630
 631     # Copy arch includes
 632     (find arch -name include -type d -print0 | \
 633         xargs -0 -n1 -I '{}' find '{}' -type f) | \
 634         cpio -pd --preserve-modification-time "${LINUX_HDROBJ_DIR}"
 635
 636     # Copy arch scripts
 637     (find arch -name scripts -type d -print0 | \
 638         xargs -0 -n1 -I '{}' find '{}' -type f) | \
 639         cpio -pd --preserve-modification-time "${LINUX_HDROBJ_DIR}"
 640
 641     # Cleanup scripts
 642     rm -f "${LINUX_HDROBJ_DIR}/scripts/*.o"
 643     rm -f "${LINUX_HDROBJ_DIR}/scripts/*/*.o"
 644
 645     # On powerpc 32bits this object is required to link modules
 646     if [ "${karch}" = "powerpc" ]; then
 647         if [ "$(scripts/config -s CONFIG_PPC64)" = "y" ] && vergte "${kversion}" "5.4"; then
 648             :
 649         else
 650             cp -a --parents arch/powerpc/lib/crtsavres.[So] "${LINUX_HDROBJ_DIR}/"
 651         fi
 652     fi
 653
 654     # On arm64 between 4.13 and 1.15 this object is required to build with ftrace support
 655     if [ "${karch}" = "arm64" ]; then
 656         if [ -f "arch/arm64/kernel/ftrace-mod.S" ]; then
 657             cp -a --parents arch/arm64/kernel/ftrace-mod.[So] "${LINUX_HDROBJ_DIR}/"
 658         fi
 659     fi
 660
 661     # Newer kernels need objtool to build modules when CONFIG_STACK_VALIDATION=y
 662     if [ -f tools/objtool/objtool ]; then
 663       cp -a --parents tools/objtool/objtool "${LINUX_HDROBJ_DIR}/"
 664     fi
 665
 666     if [ -f "arch/x86/kernel/macros.s" ]; then
 667       cp -a --parents arch/x86/kernel/macros.s "${LINUX_HDROBJ_DIR}/"
 668     fi
 669
 670     # Copy modules related stuff, if available
 671     if [ -s Module.symvers ]; then
 672         cp Module.symvers "${LINUX_HDROBJ_DIR}"
 673     fi
 674
 675     if [ -s System.map ]; then
 676         cp System.map "${LINUX_HDROBJ_DIR}"
 677     fi
 678
 679     if [ -s Module.markers ]; then
 680         cp Module.markers "${LINUX_HDROBJ_DIR}"
 681     fi
 682
 683     # Copy config file
 684     cp .config "${LINUX_HDROBJ_DIR}"
 685
 686     # Make sure the Makefile and version.h have a matching timestamp so that
 687     # external modules can be built
 688     if [ -s "${LINUX_HDROBJ_DIR}/include/generated/uapi/linux/version.h" ]; then
 689         touch -r "${LINUX_HDROBJ_DIR}/Makefile" "${LINUX_HDROBJ_DIR}/include/generated/uapi/linux/version.h"
 690     elif [ -s "${LINUX_HDROBJ_DIR}/include/linux/version.h" ]; then
 691         touch -r "${LINUX_HDROBJ_DIR}/Makefile" "${LINUX_HDROBJ_DIR}/include/linux/version.h"
 692     else
 693         echo "Missing version.h"
 694         exit 1
 695     fi
 696     touch -r "${LINUX_HDROBJ_DIR}/.config" "${LINUX_HDROBJ_DIR}/include/generated/autoconf.h"
 697
 698     # Copy .config to include/config/auto.conf so "make prepare" is unnecessary.
 699     if [ ! -f "${LINUX_HDROBJ_DIR}/include/config/auto.conf" ]; then
 700         cp "${LINUX_HDROBJ_DIR}/.config" "${LINUX_HDROBJ_DIR}/include/config/auto.conf"
 701     fi
 702
 703     # Finally clean the object files from the full source tree
 704     make clean
 705
 706     # And regen the modules support files
 707     make modules_prepare "${make_args[@]}"
 708
 709     # On powerpc 32bits this object is required to link modules
 710     if [ "${karch}" = "powerpc" ]; then
 711         if [ "$(scripts/config -s CONFIG_PPC64)" = "y" ] && vergte "${kversion}" "5.4"; then
 712             :
 713         else
 714             make arch/powerpc/lib/crtsavres.o "${make_args[@]}"
 715         fi
 716     fi
 717
 718     # On arm64 between 4.13 and 4.15 this object is required to build with ftrace support
 719     if [ "${karch}" = "arm64" ]; then
 720         if [ -f "arch/arm64/kernel/ftrace-mod.S" ]; then
 721             make arch/arm64/kernel/ftrace-mod.o "${make_args[@]}"
 722         fi
 723     fi
 724
 725     # Version specific tasks
 726     case "$ktag" in
 727       Ubuntu*)
 728         # Add Ubuntu ABI number to kernel headers, this is normally done by the packaging code
 729         ABINUM="$(echo "$ktag" | grep -P -o 'Ubuntu-(lts-)?.*-\K\d+(?=\..*)')"
 730         echo "#define UTS_UBUNTU_RELEASE_ABI $ABINUM" >> include/generated/utsrelease.h
 731         echo "#define UTS_UBUNTU_RELEASE_ABI $ABINUM" >> "${LINUX_HDROBJ_DIR}/include/generated/utsrelease.h"
 732         ;;
 733     esac
 734 }
 735
 736
 737 build_modules() {
 738
 739     local kdir="$1"
 740     local outdir="$2"
 741     local kversion
 742
 743     kversion=$(make -C "$LINUX_HDROBJ_DIR" -s kernelversion)
 744
 745     # Try to catch some compatibility problems by turning some
 746     # warnings into errors.
 747     #export KCFLAGS="$KCFLAGS -Wall -Werror"
 748
 749     # Enter lttng-modules source dir
 750     cd "${MODULES_GIT_DIR}"
 751
 752     # kernels 3.10 to 3.10.13 and 3.11 to 3.11.2 introduce a deadlock in the
 753     # timekeeping subsystem. We want those build to fail.
 754     if { vergte "$kversion" "3.10" && verlte "$kversion" "3.10.13"; } || \
 755        { vergte "$kversion" "3.11" && verlte "$kversion" "3.11.2"; }; then
 756
 757         set +e
 758
 759         # Build modules
 760         KERNELDIR="${kdir}" make -j"${NPROC}" V=1 "${make_args[@]}"
 761         ret=$?
 762
 763         set -e
 764
 765         # We expect this build to fail, if it doesn't, fail the job.
 766         if [ "$ret" -eq 0 ]; then
 767             echo "This build should have failed."
 768             exit 1
 769         fi
 770
 771         # We have to publish at least one file or the build will fail
 772         echo "This kernel is broken, there is a deadlock in the timekeeping subsystem." > "${outdir}/BROKEN.txt.ko"
 773
 774         KERNELDIR="${kdir}" make clean
 775
 776     else # Regular build
 777
 778         # Build modules against full kernel sources
 779         KERNELDIR="${kdir}" make -j"${NPROC}" V=1 "${make_args[@]}"
 780
 781         # Install modules to build dir
 782         KERNELDIR="${kdir}" make INSTALL_MOD_PATH="${outdir}" modules_install
 783
 784         # Clean build dir
 785         KERNELDIR="${kdir}" make clean
 786     fi
 787 }
 788
 789
 790 ## MAIN ##
 791
 792 # Use all CPU cores
 793 NPROC=$(nproc)
 794
 795 MODULES_GIT_DIR="${WORKSPACE}/src/lttng-modules"
 796 LINUX_GIT_DIR="${WORKSPACE}/src/linux"
 797
 798 LINUX_OBJ_DIR="${WORKSPACE}/linux"
 799 LINUX_SRCOBJ_DIR="${LINUX_OBJ_DIR}/sources"
 800 LINUX_HDROBJ_DIR="${LINUX_OBJ_DIR}/headers"
 801 LINUX_INSTOBJ_DIR="${LINUX_OBJ_DIR}/install"
 802
 803 MODULES_OUTPUT_KSRC_DIR="${WORKSPACE}/build/lttng-modules-ksrc"
 804 MODULES_OUTPUT_KHDR_DIR="${WORKSPACE}/build/lttng-modules-khdr"
 805
 806 LINUX_GIT_REF_REPO_DIR="$HOME/gitcache/linux-stable.git/"
 807
 808 OBJ_STORE_URL="s3://jenkins"
 809
 810 cd "$WORKSPACE"
 811
 812 # Create build directories
 813 mkdir -p "${LINUX_SRCOBJ_DIR}" "${LINUX_HDROBJ_DIR}" "${LINUX_INSTOBJ_DIR}" "${MODULES_OUTPUT_KSRC_DIR}" "${MODULES_OUTPUT_KHDR_DIR}"
 814
 815 git_clone_modules_sources
 816
 817 # Setup cross compile env if available
 818 if [ "x${cross_arch}" != "x" ]; then
 819
 820     case "$cross_arch" in
 821         "armhf")
 822             karch="arm"
 823             cross_compile="arm-linux-gnueabihf-"
 824             vanilla_config="imx_v6_v7_defconfig"
 825             ubuntu_config="armhf-config.flavour.generic"
 826             ;;
 827
 828         "arm64")
 829             karch="arm64"
 830             cross_compile="aarch64-linux-gnu-"
 831             vanilla_config="defconfig"
 832             ubuntu_config="arm64-config.flavour.generic"
 833             ;;
 834
 835         "powerpc")
 836             karch="powerpc"
 837             cross_compile="powerpc-linux-gnu-"
 838             vanilla_config="ppc44x_defconfig"
 839             ubuntu_config="powerpc-config.flavour.powerpc-smp"
 840             ;;
 841
 842         "ppc64el")
 843             karch="powerpc"
 844             cross_compile="powerpc64le-linux-gnu-"
 845             vanilla_config="pseries_le_defconfig"
 846             ubuntu_config="ppc64el-config.flavour.generic"
 847             ;;
 848
 849         *)
 850             echo "Unsupported cross arch $cross_arch"
 851             exit 1
 852             ;;
 853     esac
 854
 855     # Export variables used by Kbuild for cross compilation
 856     export ARCH="${karch}"
 857     export CROSS_COMPILE="${cross_compile}"
 858
 859 # Set arch specific values if we are not cross compiling
 860 elif [ "x${arch}" != "x" ]; then
 861
 862     case "$arch" in
 863         "i386")
 864             karch="x86"
 865             vanilla_config="allmodconfig"
 866             ubuntu_config="i386-config.flavour.generic"
 867             ;;
 868
 869         "amd64")
 870             karch="x86"
 871             vanilla_config="allmodconfig"
 872             ubuntu_config="amd64-config.flavour.generic"
 873             ;;
 874
 875         "armhf")
 876             karch="arm"
 877             vanilla_config="allmodconfig"
 878             ubuntu_config="armhf-config.flavour.generic"
 879             ;;
 880
 881         "arm64")
 882             karch="arm64"
 883             vanilla_config="allmodconfig"
 884             ubuntu_config="arm64-config.flavour.generic"
 885             ;;
 886
 887         "powerpc")
 888             karch="powerpc"
 889             vanilla_config="allmodconfig"
 890             ubuntu_config="powerpc-config.flavour.powerpc-smp"
 891             ;;
 892
 893         "ppc64el")
 894             karch="powerpc"
 895             vanilla_config="allmodconfig"
 896             ubuntu_config="ppc64el-config.flavour.generic"
 897             ;;
 898
 899         *)
 900             echo "Unsupported arch $arch"
 901             exit 1
 902             ;;
 903     esac
 904 else
 905     echo "No arch or cross_arch specified"
 906     exit 1
 907 fi
 908
 909
 910
 911 # First get the kernel build from the object store, or build it, if it's
 912 # not available.
 913
 914 echo "# Setup endpoint
 915 host_base = obj.internal.efficios.com
 916 host_bucket = obj.internal.efficios.com
 917 bucket_location = us-east-1
 918 use_https = True
 919
 920 # Setup access keys
 921 access_key = jenkins
 922 secret_key = echo123456
 923
 924 # Enable S3 v4 signature APIs
 925 signature_v2 = False" > "$WORKSPACE/.s3cfg"
 926
 927 url_hash="$(echo -n "$kgitrepo" | md5sum | awk '{ print $1 }')"
 928 obj_name="linux.tar.bz2"
 929
 930 if [ -z "${cross_arch}" ]; then
 931         obj_url_prefix="$OBJ_STORE_URL/linux-build/$url_hash/$ktag/platform-${platforms}/$arch/native"
 932 else
 933         obj_url_prefix="$OBJ_STORE_URL/linux-build/$url_hash/$ktag/platform-${platforms}/${cross_arch}"
 934 fi
 935
 936 obj_url="$obj_url_prefix/$obj_name"
 937
 938 set +e
 939 # In s3cmd 2.3, the return code of get when an object does not exist (64)
 940 # is different than in 2.2 (12). The return codes of 's3cmd info' are
 941 # consistent between 2.2 and 2.3.
 942 s3cmd -c "$WORKSPACE/.s3cfg" info "$obj_url"
 943 ret=$?
 944 set -e
 945
 946 case "$ret" in
 947     "0")
 948       s3cmd -c "$WORKSPACE/.s3cfg" get "$obj_url"
 949       extract_archive_obj
 950       ;;
 951
 952     "12")
 953       echo "File not found"
 954
 955       # Build all the things and upload
 956       # then finish the module build...
 957
 958       git_clone_linux_sources
 959       git_export_linux_sources
 960
 961       select_compiler
 962
 963       ## PREPARE FULL LINUX SOURCE TREE
 964       build_linux_kernel
 965
 966       ## EXTRACT DISTRO STYLE KERNEL HEADERS / DEVEL
 967       extract_distro_headers
 968
 969       tar_archive_obj
 970
 971       upload_archive_obj
 972
 973       ;;
 974
 975     *)
 976       echo "Unknown error? Abort"
 977       exit 1
 978       ;;
 979 esac
 980
 981 select_compiler
 982
 983 selected_cc_version="$(echo "${selected_cc}" | cut -d'-' -f2)"
 984 # lttng-modules requires gcc >= 5.1 for aarch64
 985 # @see https://github.com/lttng/lttng-modules/commit/be06402dbdbea2f3394e60ec15c5d3356e2be416
 986 if { verlt "${selected_cc_version}" "5.1"; } && [ "${cross_arch}" = "arm64" ] ; then
 987     echo "Building lltng-modules on aarch64 requires gcc >= 5.1"
 988     exit 0
 989 fi
 990
 991 ## BUILD modules
 992 # Either we downloaded a pre-build kernel or we built it and uploaded
 993 # the archive for future builds.
 994
 995 cd "$WORKSPACE"
 996
 997 # Build modules against full kernel sources
 998 build_modules "${LINUX_SRCOBJ_DIR}" "${MODULES_OUTPUT_KSRC_DIR}"
 999
1000 # Build modules against kernel headers
1001 build_modules "${LINUX_HDROBJ_DIR}" "${MODULES_OUTPUT_KHDR_DIR}"
1002
1003 # Make sure some modules were actually built
1004 tree "${MODULES_OUTPUT_KSRC_DIR}"
1005 if [ "x$(find "${MODULES_OUTPUT_KSRC_DIR}" -name '*.ko*' -printf yes -quit)" != "xyes" ]; then
1006   echo "No modules built!"
1007   exit 1
1008 fi
1009
1010 tree "${MODULES_OUTPUT_KHDR_DIR}"
1011 if [ "x$(find "${MODULES_OUTPUT_KHDR_DIR}" -name '*.ko*' -printf yes -quit)" != "xyes" ]; then
1012   echo "No modules built!"
1013   exit 1
1014 fi
1015
1016 # EOF