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glibc/glibc-upstream-2.34-253.patch
Arjun Shankar 601650f878 Import glibc-2.34-35.fc35 from f35 
* Tue May 31 2022 Arjun Shankar <arjun@redhat.com> - 2.34-35
- Sync with upstream branch release/2.34/master,
  commit ff450cdbdee0b8cb6b9d653d6d2fa892de29be31:
- Fix deadlock when pthread_atfork handler calls pthread_atfork or dlclose
- x86: Fallback {str|wcs}cmp RTM in the ncmp overflow case [BZ #29127]
- string.h: fix __fortified_attr_access macro call [BZ #29162]
- linux: Add a getauxval test [BZ #23293]
- rtld: Use generic argv adjustment in ld.so [BZ #23293]
- S390: Enable static PIE

* Thu May 19 2022 Florian Weimer <fweimer@redhat.com> - 2.34-34
- Sync with upstream branch release/2.34/master,
  commit ede8d94d154157d269b18f3601440ac576c1f96a:
- csu: Implement and use _dl_early_allocate during static startup
- Linux: Introduce __brk_call for invoking the brk system call
- Linux: Implement a useful version of _startup_fatal
- ia64: Always define IA64_USE_NEW_STUB as a flag macro
- Linux: Define MMAP_CALL_INTERNAL
- i386: Honor I386_USE_SYSENTER for 6-argument Linux system calls
- i386: Remove OPTIMIZE_FOR_GCC_5 from Linux libc-do-syscall.S
- elf: Remove __libc_init_secure
- Linux: Consolidate auxiliary vector parsing (redo)
- Linux: Include <dl-auxv.h> in dl-sysdep.c only for SHARED
- Revert "Linux: Consolidate auxiliary vector parsing"
- Linux: Consolidate auxiliary vector parsing
- Linux: Assume that NEED_DL_SYSINFO_DSO is always defined
- Linux: Remove DL_FIND_ARG_COMPONENTS
- Linux: Remove HAVE_AUX_SECURE, HAVE_AUX_XID, HAVE_AUX_PAGESIZE
- elf: Merge dl-sysdep.c into the Linux version
- elf: Remove unused NEED_DL_BASE_ADDR and _dl_base_addr
- x86: Optimize {str|wcs}rchr-evex
- x86: Optimize {str|wcs}rchr-avx2
- x86: Optimize {str|wcs}rchr-sse2
- x86: Cleanup page cross code in memcmp-avx2-movbe.S
- x86: Remove memcmp-sse4.S
- x86: Small improvements for wcslen
- x86: Remove AVX str{n}casecmp
- x86: Add EVEX optimized str{n}casecmp
- x86: Add AVX2 optimized str{n}casecmp
- x86: Optimize str{n}casecmp TOLOWER logic in strcmp-sse42.S
- x86: Optimize str{n}casecmp TOLOWER logic in strcmp.S
- x86: Remove strspn-sse2.S and use the generic implementation
- x86: Remove strpbrk-sse2.S and use the generic implementation
- x87: Remove strcspn-sse2.S and use the generic implementation
- x86: Optimize strspn in strspn-c.c
- x86: Optimize strcspn and strpbrk in strcspn-c.c
- x86: Code cleanup in strchr-evex and comment justifying branch
- x86: Code cleanup in strchr-avx2 and comment justifying branch
- x86_64: Remove bcopy optimizations
- x86-64: Remove bzero weak alias in SS2 memset
- x86_64/multiarch: Sort sysdep_routines and put one entry per line
- x86: Improve L to support L(XXX_SYMBOL (YYY, ZZZ))
- fortify: Ensure that __glibc_fortify condition is a constant [BZ #29141]

* Thu May 12 2022 Florian Weimer <fweimer@redhat.com> - 2.34-33
- Sync with upstream branch release/2.34/master,
  commit 91c2e6c3db44297bf4cb3a2e3c40236c5b6a0b23:
- dlfcn: Implement the RTLD_DI_PHDR request type for dlinfo
- manual: Document the dlinfo function
- x86: Fix fallback for wcsncmp_avx2 in strcmp-avx2.S [BZ #28896]
- x86: Fix bug in strncmp-evex and strncmp-avx2 [BZ #28895]
- x86: Set .text section in memset-vec-unaligned-erms
- x86-64: Optimize bzero
- x86: Remove SSSE3 instruction for broadcast in memset.S (SSE2 Only)
- x86: Improve vec generation in memset-vec-unaligned-erms.S
- x86-64: Fix strcmp-evex.S
- x86-64: Fix strcmp-avx2.S
- x86: Optimize strcmp-evex.S
- x86: Optimize strcmp-avx2.S
- manual: Clarify that abbreviations of long options are allowed
- Add HWCAP2_AFP, HWCAP2_RPRES from Linux 5.17 to AArch64 bits/hwcap.h
- aarch64: Add HWCAP2_ECV from Linux 5.16
- Add SOL_MPTCP, SOL_MCTP from Linux 5.16 to bits/socket.h
- Update kernel version to 5.17 in tst-mman-consts.py
- Update kernel version to 5.16 in tst-mman-consts.py
- Update syscall lists for Linux 5.17
- Add ARPHRD_CAN, ARPHRD_MCTP to net/if_arp.h
- Update kernel version to 5.15 in tst-mman-consts.py
- Add PF_MCTP, AF_MCTP from Linux 5.15 to bits/socket.h

Resolves: #2091541
2022-06-06 16:33:33 +02:00

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commit 89b638f48ac5c9af5b1fe9caa6287d70127b66a5
Author: Stefan Liebler <stli@linux.ibm.com>
Date: Tue May 17 16:12:18 2022 +0200
S390: Enable static PIE
This commit enables static PIE on 64bit. On 31bit, static PIE is
not supported.
A new configure check in sysdeps/s390/s390-64/configure.ac also performs
a minimal test for requirements in ld:
Ensure you also have those patches for:
- binutils (ld)
- "[PR ld/22263] s390: Avoid dynamic TLS relocs in PIE"
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=26b1426577b5dcb32d149c64cca3e603b81948a9
(Tested by configure check above)
Otherwise there will be a R_390_TLS_TPOFF relocation, which fails to
be processed in _dl_relocate_static_pie() as static TLS map is not setup.
- "s390: Add DT_JMPREL pointing to .rela.[i]plt with static-pie"
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=d942d8db12adf4c9e5c7d9ed6496a779ece7149e
(We can't test it in configure as we are not able to link a static PIE
executable if the system glibc lacks static PIE support)
Otherwise there won't be DT_JMPREL, DT_PLTRELA, DT_PLTRELASZ entries
and the IFUNC symbols are not processed, which leads to crashes.
- kernel (the mentioned links to the commits belong to 5.19 merge window):
- "s390/mmap: increase stack/mmap gap to 128MB"
https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=f2f47d0ef72c30622e62471903ea19446ea79ee2
- "s390/vdso: move vdso mapping to its own function"
https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=57761da4dc5cd60bed2c81ba0edb7495c3c740b8
- "s390/vdso: map vdso above stack"
https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=9e37a2e8546f9e48ea76c839116fa5174d14e033
- "s390/vdso: add vdso randomization"
https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=41cd81abafdc4e58a93fcb677712a76885e3ca25
(We can't test the kernel of the target system)
Otherwise if /proc/sys/kernel/randomize_va_space is turned off (0),
static PIE executables like ldconfig will crash. While startup sbrk is
used to enlarge the HEAP. Unfortunately the underlying brk syscall fails
as there is not enough space after the HEAP. Then the address of the TLS
image is invalid and the following memcpy in __libc_setup_tls() leads
to a segfault.
If /proc/sys/kernel/randomize_va_space is activated (default: 2), there
is enough space after HEAP.
- glibc
- "Linux: Define MMAP_CALL_INTERNAL"
https://sourceware.org/git/?p=glibc.git;a=commit;h=c1b68685d438373efe64e5f076f4215723004dfb
- "i386: Remove OPTIMIZE_FOR_GCC_5 from Linux libc-do-syscall.S"
https://sourceware.org/git/?p=glibc.git;a=commit;h=6e5c7a1e262961adb52443ab91bd2c9b72316402
- "i386: Honor I386_USE_SYSENTER for 6-argument Linux system calls"
https://sourceware.org/git/?p=glibc.git;a=commit;h=60f0f2130d30cfd008ca39743027f1e200592dff
- "ia64: Always define IA64_USE_NEW_STUB as a flag macro"
https://sourceware.org/git/?p=glibc.git;a=commit;h=18bd9c3d3b1b6a9182698c85354578d1d58e9d64
- "Linux: Implement a useful version of _startup_fatal"
https://sourceware.org/git/?p=glibc.git;a=commit;h=a2a6bce7d7e52c1c34369a7da62c501cc350bc31
- "Linux: Introduce __brk_call for invoking the brk system call"
https://sourceware.org/git/?p=glibc.git;a=commit;h=b57ab258c1140bc45464b4b9908713e3e0ee35aa
- "csu: Implement and use _dl_early_allocate during static startup"
https://sourceware.org/git/?p=glibc.git;a=commit;h=f787e138aa0bf677bf74fa2a08595c446292f3d7
The mentioned patch series by Florian Weimer avoids the mentioned failing
sbrk syscall by falling back to mmap.
This commit also adjusts startup code in start.S to be ready for static PIE.
We have to add a wrapper function for main as we are not allowed to use
GOT relocations before __libc_start_main is called.
(Compare also to:
- commit 14d886edbd3d80b771e1c42fbd9217f9074de9c6
"aarch64: fix start code for static pie"
- commit 3d1d79283e6de4f7c434cb67fb53a4fd28359669
"aarch64: fix static pie enabled libc when main is in a shared library"
)
(cherry picked from commit 728894dba4a19578bd803906de184a8dd51ed13c)
diff --git a/sysdeps/s390/s390-64/configure b/sysdeps/s390/s390-64/configure
new file mode 100644
index 0000000000000000..101c570d2e62da25
--- /dev/null
+++ b/sysdeps/s390/s390-64/configure
@@ -0,0 +1,122 @@
+# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
+ # Local configure fragment for sysdeps/s390/s390-64.
+
+# Minimal checking for static PIE support in ld.
+# Compare to ld testcase/bugzilla:
+# <binutils-source>/ld/testsuite/ld-elf/pr22263-1.rd
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for s390-specific static PIE requirements" >&5
+$as_echo_n "checking for s390-specific static PIE requirements... " >&6; }
+if { as_var=\
+libc_cv_s390x_staticpie_req; eval \${$as_var+:} false; }; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat > conftest1.c <<EOF
+__thread int * foo;
+
+void
+bar (void)
+{
+ *foo = 1;
+}
+EOF
+ cat > conftest2.c <<EOF
+extern __thread int *foo;
+extern void bar (void);
+static int x;
+
+int
+main ()
+{
+ foo = &x;
+ return 0;
+}
+EOF
+ libc_cv_s390x_staticpie_req=no
+ if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -fPIE -c conftest1.c -o conftest1.o'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } \
+ && { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -fPIE -c conftest2.c -o conftest2.o'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } \
+ && { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -pie -o conftest conftest1.o conftest2.o'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } \
+ && { ac_try='! readelf -Wr conftest | grep R_390_TLS_TPOFF'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; }
+ then
+ libc_cv_s390x_staticpie_req=yes
+ fi
+ rm -rf conftest.*
+fi
+eval ac_res=\$\
+libc_cv_s390x_staticpie_req
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+if test $libc_cv_s390x_staticpie_req = yes; then
+ # Static PIE is supported only on 64bit.
+ # Ensure you also have those patches for:
+ # - binutils (ld)
+ # - "[PR ld/22263] s390: Avoid dynamic TLS relocs in PIE"
+ # https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=26b1426577b5dcb32d149c64cca3e603b81948a9
+ # (Tested by configure check above)
+ # Otherwise there will be a R_390_TLS_TPOFF relocation, which fails to
+ # be processed in _dl_relocate_static_pie() as static TLS map is not setup.
+ # - "s390: Add DT_JMPREL pointing to .rela.[i]plt with static-pie"
+ # https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=d942d8db12adf4c9e5c7d9ed6496a779ece7149e
+ # (We can't test it in configure as we are not able to link a static PIE
+ # executable if the system glibc lacks static PIE support)
+ # Otherwise there won't be DT_JMPREL, DT_PLTRELA, DT_PLTRELASZ entries
+ # and the IFUNC symbols are not processed, which leads to crashes.
+ #
+ # - kernel (the mentioned links to the commits belong to 5.19 merge window):
+ # - "s390/mmap: increase stack/mmap gap to 128MB"
+ # https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=f2f47d0ef72c30622e62471903ea19446ea79ee2
+ # - "s390/vdso: move vdso mapping to its own function"
+ # https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=57761da4dc5cd60bed2c81ba0edb7495c3c740b8
+ # - "s390/vdso: map vdso above stack"
+ # https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=9e37a2e8546f9e48ea76c839116fa5174d14e033
+ # - "s390/vdso: add vdso randomization"
+ # https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=41cd81abafdc4e58a93fcb677712a76885e3ca25
+ # (We can't test the kernel of the target system)
+ # Otherwise if /proc/sys/kernel/randomize_va_space is turned off (0),
+ # static PIE executables like ldconfig will crash. While startup sbrk is
+ # used to enlarge the HEAP. Unfortunately the underlying brk syscall fails
+ # as there is not enough space after the HEAP. Then the address of the TLS
+ # image is invalid and the following memcpy in __libc_setup_tls() leads
+ # to a segfault.
+ # If /proc/sys/kernel/randomize_va_space is activated (default: 2), there
+ # is enough space after HEAP.
+ #
+ # - glibc
+ # - "Linux: Define MMAP_CALL_INTERNAL"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=c1b68685d438373efe64e5f076f4215723004dfb
+ # - "i386: Remove OPTIMIZE_FOR_GCC_5 from Linux libc-do-syscall.S"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=6e5c7a1e262961adb52443ab91bd2c9b72316402
+ # - "i386: Honor I386_USE_SYSENTER for 6-argument Linux system calls"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=60f0f2130d30cfd008ca39743027f1e200592dff
+ # - "ia64: Always define IA64_USE_NEW_STUB as a flag macro"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=18bd9c3d3b1b6a9182698c85354578d1d58e9d64
+ # - "Linux: Implement a useful version of _startup_fatal"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=a2a6bce7d7e52c1c34369a7da62c501cc350bc31
+ # - "Linux: Introduce __brk_call for invoking the brk system call"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=b57ab258c1140bc45464b4b9908713e3e0ee35aa
+ # - "csu: Implement and use _dl_early_allocate during static startup"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=f787e138aa0bf677bf74fa2a08595c446292f3d7
+ # The mentioned patch series by Florian Weimer avoids the mentioned failing
+ # sbrk syscall by falling back to mmap.
+ $as_echo "#define SUPPORT_STATIC_PIE 1" >>confdefs.h
+
+fi
diff --git a/sysdeps/s390/s390-64/configure.ac b/sysdeps/s390/s390-64/configure.ac
new file mode 100644
index 0000000000000000..2583a4a3350ac11f
--- /dev/null
+++ b/sysdeps/s390/s390-64/configure.ac
@@ -0,0 +1,92 @@
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/s390/s390-64.
+
+# Minimal checking for static PIE support in ld.
+# Compare to ld testcase/bugzilla:
+# <binutils-source>/ld/testsuite/ld-elf/pr22263-1.rd
+AC_CACHE_CHECK([for s390-specific static PIE requirements], \
+[libc_cv_s390x_staticpie_req], [dnl
+ cat > conftest1.c <<EOF
+__thread int * foo;
+
+void
+bar (void)
+{
+ *foo = 1;
+}
+EOF
+ cat > conftest2.c <<EOF
+extern __thread int *foo;
+extern void bar (void);
+static int x;
+
+int
+main ()
+{
+ foo = &x;
+ return 0;
+}
+EOF
+ libc_cv_s390x_staticpie_req=no
+ if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -fPIE -c conftest1.c -o conftest1.o]) \
+ && AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -fPIE -c conftest2.c -o conftest2.o]) \
+ && AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -pie -o conftest conftest1.o conftest2.o]) \
+ && AC_TRY_COMMAND([! readelf -Wr conftest | grep R_390_TLS_TPOFF])
+ then
+ libc_cv_s390x_staticpie_req=yes
+ fi
+ rm -rf conftest.*])
+if test $libc_cv_s390x_staticpie_req = yes; then
+ # Static PIE is supported only on 64bit.
+ # Ensure you also have those patches for:
+ # - binutils (ld)
+ # - "[PR ld/22263] s390: Avoid dynamic TLS relocs in PIE"
+ # https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=26b1426577b5dcb32d149c64cca3e603b81948a9
+ # (Tested by configure check above)
+ # Otherwise there will be a R_390_TLS_TPOFF relocation, which fails to
+ # be processed in _dl_relocate_static_pie() as static TLS map is not setup.
+ # - "s390: Add DT_JMPREL pointing to .rela.[i]plt with static-pie"
+ # https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=d942d8db12adf4c9e5c7d9ed6496a779ece7149e
+ # (We can't test it in configure as we are not able to link a static PIE
+ # executable if the system glibc lacks static PIE support)
+ # Otherwise there won't be DT_JMPREL, DT_PLTRELA, DT_PLTRELASZ entries
+ # and the IFUNC symbols are not processed, which leads to crashes.
+ #
+ # - kernel (the mentioned links to the commits belong to 5.19 merge window):
+ # - "s390/mmap: increase stack/mmap gap to 128MB"
+ # https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=f2f47d0ef72c30622e62471903ea19446ea79ee2
+ # - "s390/vdso: move vdso mapping to its own function"
+ # https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=57761da4dc5cd60bed2c81ba0edb7495c3c740b8
+ # - "s390/vdso: map vdso above stack"
+ # https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=9e37a2e8546f9e48ea76c839116fa5174d14e033
+ # - "s390/vdso: add vdso randomization"
+ # https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=41cd81abafdc4e58a93fcb677712a76885e3ca25
+ # (We can't test the kernel of the target system)
+ # Otherwise if /proc/sys/kernel/randomize_va_space is turned off (0),
+ # static PIE executables like ldconfig will crash. While startup sbrk is
+ # used to enlarge the HEAP. Unfortunately the underlying brk syscall fails
+ # as there is not enough space after the HEAP. Then the address of the TLS
+ # image is invalid and the following memcpy in __libc_setup_tls() leads
+ # to a segfault.
+ # If /proc/sys/kernel/randomize_va_space is activated (default: 2), there
+ # is enough space after HEAP.
+ #
+ # - glibc
+ # - "Linux: Define MMAP_CALL_INTERNAL"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=c1b68685d438373efe64e5f076f4215723004dfb
+ # - "i386: Remove OPTIMIZE_FOR_GCC_5 from Linux libc-do-syscall.S"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=6e5c7a1e262961adb52443ab91bd2c9b72316402
+ # - "i386: Honor I386_USE_SYSENTER for 6-argument Linux system calls"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=60f0f2130d30cfd008ca39743027f1e200592dff
+ # - "ia64: Always define IA64_USE_NEW_STUB as a flag macro"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=18bd9c3d3b1b6a9182698c85354578d1d58e9d64
+ # - "Linux: Implement a useful version of _startup_fatal"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=a2a6bce7d7e52c1c34369a7da62c501cc350bc31
+ # - "Linux: Introduce __brk_call for invoking the brk system call"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=b57ab258c1140bc45464b4b9908713e3e0ee35aa
+ # - "csu: Implement and use _dl_early_allocate during static startup"
+ # https://sourceware.org/git/?p=glibc.git;a=commit;h=f787e138aa0bf677bf74fa2a08595c446292f3d7
+ # The mentioned patch series by Florian Weimer avoids the mentioned failing
+ # sbrk syscall by falling back to mmap.
+ AC_DEFINE(SUPPORT_STATIC_PIE)
+fi
diff --git a/sysdeps/s390/s390-64/start.S b/sysdeps/s390/s390-64/start.S
index 4e6526308aee3c00..b4a66e4a97b83397 100644
--- a/sysdeps/s390/s390-64/start.S
+++ b/sysdeps/s390/s390-64/start.S
@@ -85,10 +85,25 @@ _start:
/* Ok, now branch to the libc main routine. */
#ifdef PIC
+# ifdef SHARED
+ /* Used for dynamic linked position independent executable.
+ => Scrt1.o */
larl %r2,main@GOTENT # load pointer to main
lg %r2,0(%r2)
+# else
+ /* Used for dynamic linked position dependent executable.
+ => crt1.o (glibc configured without --disable-default-pie:
+ PIC is defined)
+ Or for static linked position independent executable.
+ => rcrt1.o (only available if glibc configured without
+ --disable-default-pie: PIC is defined) */
+ larl %r2,__wrap_main
+# endif
brasl %r14,__libc_start_main@plt
#else
+ /* Used for dynamic/static linked position dependent executable.
+ => crt1.o (glibc configured with --disable-default-pie:
+ PIC and SHARED are not defined) */
larl %r2,main # load pointer to main
brasl %r14,__libc_start_main
#endif
@@ -98,6 +113,19 @@ _start:
cfi_endproc
+#if defined PIC && !defined SHARED
+ /* When main is not defined in the executable but in a shared library
+ then a wrapper is needed in crt1.o of the static-pie enabled libc,
+ because crt1.o and rcrt1.o share code and the later must avoid the
+ use of GOT relocations before __libc_start_main is called. */
+__wrap_main:
+ cfi_startproc
+ larl %r1,main@GOTENT # load pointer to main
+ lg %r1,0(%r1)
+ br %r1
+ cfi_endproc
+#endif
+
/* Define a symbol for the first piece of initialized data. */
.data
.globl __data_start
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