Kernel+Toolchain: Use .init_array section for global constructors

Before this change, our dynamic linker's global constructor handler relied on the GNU linker implicitly including the content of `.ctors` section inside `.init_array`. The mold linker does not do this, so global constructors would fail to be called in the mold-built userland. There is no point in sticking to `.ctors`, as most other systems already use the superior `.init_array` scheme. This commit changes the kernel linker script to not discard this new section, and enables it by default in our toolchain.
Author: https://github.com/BertalanD Commit: https://github.com/SerenityOS/serenity/commit/5576e9c4c51 Pull-request: https://github.com/SerenityOS/serenity/pull/12049 Reviewed-by: https://github.com/ADKaster Reviewed-by: https://github.com/IdanHo Reviewed-by: https://github.com/alimpfard Reviewed-by: https://github.com/bgianfo ✅ Reviewed-by: https://github.com/linusg ✅
2022-01-19 19:12:50 +01:00 · 2022-01-19 19:12:50 +01:00 · 5576e9c4c5 · 2024-07-17 20:19:13 +09:00
commit 5576e9c4c5
parent eeb74e2578
3 changed files with 4 additions and 1 deletions
--- a/Kernel/linker.ld
+++ b/Kernel/linker.ld
@ -59,10 +59,12 @@ SECTIONS
    {
        start_heap_ctors = .;
        *libkernel_heap.a:*(.ctors)
+        *libkernel_heap.a:*(.init_array)
        end_heap_ctors = .;

        start_ctors = .;
        *(.ctors)
+        *(.init_array)
        end_ctors = .;

        *(.rodata*)
--- a/Ports/gcc/package.sh
+++ b/Ports/gcc/package.sh
@ -2,7 +2,7 @@
 port=gcc
 version=11.2.0
 useconfigure=true
-configopts=("--target=${SERENITY_ARCH}-pc-serenity" "--with-sysroot=/" "--with-build-sysroot=${SERENITY_INSTALL_ROOT}" "--with-newlib" "--enable-languages=c,c++" "--disable-lto" "--disable-nls" "--enable-shared" "--enable-default-pie" "--enable-host-shared" "--enable-threads=posix")
+configopts=("--target=${SERENITY_ARCH}-pc-serenity" "--with-sysroot=/" "--with-build-sysroot=${SERENITY_INSTALL_ROOT}" "--with-newlib" "--enable-languages=c,c++" "--disable-lto" "--disable-nls" "--enable-shared" "--enable-default-pie" "--enable-host-shared" "--enable-threads=posix" "--enable-initfini-array")
 files="https://ftpmirror.gnu.org/gnu/gcc/gcc-${version}/gcc-${version}.tar.xz gcc-${version}.tar.xz d08edc536b54c372a1010ff6619dd274c0f1603aa49212ba20f7aa2cda36fa8b"
 makeopts=("all-gcc" "all-target-libgcc" "all-target-libstdc++-v3" "-j$(nproc)")
 installopts=("DESTDIR=${SERENITY_INSTALL_ROOT}" "install-gcc" "install-target-libgcc" "install-target-libstdc++-v3")
--- a/Toolchain/BuildIt.sh
+++ b/Toolchain/BuildIt.sh
@ -379,6 +379,7 @@ pushd "$DIR/Build/$ARCH"
                                            --enable-default-pie \
                                            --enable-lto \
                                            --enable-threads=posix \
+                                            --enable-initfini-array \
                                            ${TRY_USE_LOCAL_TOOLCHAIN:+"--quiet"} || exit 1

        echo "XXX build gcc and libgcc"