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f5f96b784b
The static PIE configure check uses link tests. When bootstrapping
a cross-toolchain, the link tests fail due to missing crt-files /
libc.so. As we explicitely want to test an issue in binutils (ld),
we now also explicitely check for known linker versions.
See also commit 368b7c614b
S390: Use compile-only instead of also link-tests in configure.
123 lines
5.9 KiB
Plaintext
123 lines
5.9 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/s390/s390-64.
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# Bypass result of runtime configure check for known linker versions as
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# e.g. crt-files or libc.so might not be available in bootstrapping
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# environments.
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case $($LD --version) in
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"GNU gold"*)
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# As of 2023-08-07, gold does not support static PIE due to
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# Bug 22221 - add --no-dynamic-linker option
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# https://sourceware.org/bugzilla/show_bug.cgi?id=22221
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libc_cv_s390x_staticpie_req_version=no
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;;
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"LLD"*)
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# As of 2023-08-07, there is no lld which supports s390x.
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libc_cv_s390x_staticpie_req_version=no
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;;
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*)
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# The required binutils patches are available with bintuils 2.39
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libc_cv_s390x_staticpie_req_version=yes
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# Skip AC_CHECK_PROGS and just use the result from main configure.ac.
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libc_cv_s390x_staticpie_req_LD=$LD
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AC_CHECK_PROG_VER(libc_cv_s390x_staticpie_req_LD, $LD, --version,
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[GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
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[2.1[0-9][0-9]*|2.39*|2.[4-9][0-9]*|[3-9].*|[1-9][0-9]*],
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libc_cv_s390x_staticpie_req_version=no)
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;;
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esac
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AC_MSG_CHECKING([for s390-specific static PIE requirements (version check)])
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AC_MSG_RESULT($libc_cv_s390x_staticpie_req_version)
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# Minimal checking for static PIE support in ld.
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# Compare to ld testcase/bugzilla:
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# <binutils-source>/ld/testsuite/ld-elf/pr22263-1.rd
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AC_CACHE_CHECK([for s390-specific static PIE requirements (runtime check)], \
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[libc_cv_s390x_staticpie_req_runtime], [dnl
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cat > conftest1.c <<EOF
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__thread int * foo;
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void
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bar (void)
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{
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*foo = 1;
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}
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EOF
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cat > conftest2.c <<EOF
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extern __thread int *foo;
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extern void bar (void);
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static int x;
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int
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main ()
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{
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foo = &x;
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return 0;
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}
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EOF
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libc_cv_s390x_staticpie_req_runtime=no
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if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -fPIE -c conftest1.c -o conftest1.o]) \
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&& AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -fPIE -c conftest2.c -o conftest2.o]) \
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&& AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -pie -o conftest conftest1.o conftest2.o]) \
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&& AC_TRY_COMMAND([! LC_ALL=C $READELF -Wr conftest | grep R_390_TLS_TPOFF])
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then
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libc_cv_s390x_staticpie_req_runtime=yes
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fi
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rm -rf conftest.*])
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if test $libc_cv_s390x_staticpie_req_runtime = yes \
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|| test $libc_cv_s390x_staticpie_req_version = yes; then
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# Static PIE is supported only on 64bit.
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# Ensure you also have those patches for:
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# - binutils (ld)
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# - "[PR ld/22263] s390: Avoid dynamic TLS relocs in PIE"
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# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=26b1426577b5dcb32d149c64cca3e603b81948a9
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# (Tested by configure check above)
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# Otherwise there will be a R_390_TLS_TPOFF relocation, which fails to
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# be processed in _dl_relocate_static_pie() as static TLS map is not setup.
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# - "s390: Add DT_JMPREL pointing to .rela.[i]plt with static-pie"
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# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=d942d8db12adf4c9e5c7d9ed6496a779ece7149e
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# (We can't test it in configure as we are not able to link a static PIE
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# executable if the system glibc lacks static PIE support)
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# Otherwise there won't be DT_JMPREL, DT_PLTRELA, DT_PLTRELASZ entries
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# and the IFUNC symbols are not processed, which leads to crashes.
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#
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# - kernel (the mentioned links to the commits belong to 5.19 merge window):
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# - "s390/mmap: increase stack/mmap gap to 128MB"
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# https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=f2f47d0ef72c30622e62471903ea19446ea79ee2
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# - "s390/vdso: move vdso mapping to its own function"
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# https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=57761da4dc5cd60bed2c81ba0edb7495c3c740b8
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# - "s390/vdso: map vdso above stack"
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# https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=9e37a2e8546f9e48ea76c839116fa5174d14e033
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# - "s390/vdso: add vdso randomization"
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# https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=41cd81abafdc4e58a93fcb677712a76885e3ca25
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# (We can't test the kernel of the target system)
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# Otherwise if /proc/sys/kernel/randomize_va_space is turned off (0),
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# static PIE executables like ldconfig will crash. While startup sbrk is
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# used to enlarge the HEAP. Unfortunately the underlying brk syscall fails
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# as there is not enough space after the HEAP. Then the address of the TLS
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# image is invalid and the following memcpy in __libc_setup_tls() leads
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# to a segfault.
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# If /proc/sys/kernel/randomize_va_space is activated (default: 2), there
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# is enough space after HEAP.
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#
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# - glibc
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# - "Linux: Define MMAP_CALL_INTERNAL"
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# https://sourceware.org/git/?p=glibc.git;a=commit;h=c1b68685d438373efe64e5f076f4215723004dfb
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# - "i386: Remove OPTIMIZE_FOR_GCC_5 from Linux libc-do-syscall.S"
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# https://sourceware.org/git/?p=glibc.git;a=commit;h=6e5c7a1e262961adb52443ab91bd2c9b72316402
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# - "i386: Honor I386_USE_SYSENTER for 6-argument Linux system calls"
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# https://sourceware.org/git/?p=glibc.git;a=commit;h=60f0f2130d30cfd008ca39743027f1e200592dff
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# - "ia64: Always define IA64_USE_NEW_STUB as a flag macro"
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# https://sourceware.org/git/?p=glibc.git;a=commit;h=18bd9c3d3b1b6a9182698c85354578d1d58e9d64
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# - "Linux: Implement a useful version of _startup_fatal"
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# https://sourceware.org/git/?p=glibc.git;a=commit;h=a2a6bce7d7e52c1c34369a7da62c501cc350bc31
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# - "Linux: Introduce __brk_call for invoking the brk system call"
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# https://sourceware.org/git/?p=glibc.git;a=commit;h=b57ab258c1140bc45464b4b9908713e3e0ee35aa
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# - "csu: Implement and use _dl_early_allocate during static startup"
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# https://sourceware.org/git/?p=glibc.git;a=commit;h=f787e138aa0bf677bf74fa2a08595c446292f3d7
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# The mentioned patch series by Florian Weimer avoids the mentioned failing
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# sbrk syscall by falling back to mmap.
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AC_DEFINE(SUPPORT_STATIC_PIE)
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fi
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