123 lines
5.8 KiB
Plaintext
123 lines
5.8 KiB
Plaintext
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# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
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# Local configure fragment for sysdeps/s390/s390-64.
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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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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for s390-specific static PIE requirements" >&5
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$as_echo_n "checking for s390-specific static PIE requirements... " >&6; }
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if { as_var=\
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libc_cv_s390x_staticpie_req; eval \${$as_var+:} false; }; then :
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$as_echo_n "(cached) " >&6
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else
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cat > conftest1.c <<EOF
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__thread int * foo;
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void
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bar (void)
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{
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*foo = 1;
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}
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EOF
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cat > conftest2.c <<EOF
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extern __thread int *foo;
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extern void bar (void);
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static int x;
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int
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main ()
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{
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foo = &x;
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return 0;
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}
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EOF
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libc_cv_s390x_staticpie_req=no
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if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -fPIE -c conftest1.c -o conftest1.o'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; } \
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&& { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -fPIE -c conftest2.c -o conftest2.o'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; } \
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&& { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -pie -o conftest conftest1.o conftest2.o'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; } \
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&& { ac_try='! LC_ALL=C $READELF -Wr conftest | grep R_390_TLS_TPOFF'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; }
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then
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libc_cv_s390x_staticpie_req=yes
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fi
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rm -rf conftest.*
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fi
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eval ac_res=\$\
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libc_cv_s390x_staticpie_req
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
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$as_echo "$ac_res" >&6; }
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if test $libc_cv_s390x_staticpie_req = 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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$as_echo "#define SUPPORT_STATIC_PIE 1" >>confdefs.h
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fi
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