+2020-01-31 Sandra Loosemore <sandra@codesourcery.com>
+
+ nios2: Support for GOT-relative DW_EH_PE_datarel encoding.
+
+ * configure.ac [nios2-*-*]: Check HAVE_AS_NIOS2_GOTOFF_RELOCATION.
+ * config.in: Regenerated.
+ * configure: Regenerated.
+ * config/nios2/nios2.h (ASM_PREFERRED_EH_DATA_FORMAT): Fix handling
+ for PIC when HAVE_AS_NIOS2_GOTOFF_RELOCATION.
+ (ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX): New.
+
2020-02-01 Andrew Burgess <andrew.burgess@embecosm.com>
* configure: Regenerate.
#endif
+/* Define if your assembler supports %gotoff relocation syntax. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AS_NIOS2_GOTOFF_RELOCATION
+#endif
+
+
/* Define if your assembler supports the -no-mul-bug-abort option. */
#ifndef USED_FOR_TARGET
#undef HAVE_AS_NO_MUL_BUG_ABORT_OPTION
#define EH_RETURN_DATA_REGNO(N) ((N) <= (LAST_ARG_REGNO - FIRST_ARG_REGNO) \
? (N) + FIRST_ARG_REGNO : INVALID_REGNUM)
-/* Nios II has no appropriate relocations for a 32-bit PC-relative or
- section-relative pointer encoding. This therefore always chooses an
- absolute representation for pointers. An unfortunate consequence of
- this is that ld complains about the absolute fde encoding when linking
- with -shared or -fpie, but the warning is harmless and there seems to
- be no good way to suppress it. */
+/* For PIC, use indirect for global references; it'll end up using a dynamic
+ relocation, which we want to keep out of read-only EH sections.
+ For local references, we want to use GOT-relative offsets provided
+ the assembler supports them. For non-PIC, use an absolute encoding. */
+#ifdef HAVE_AS_NIOS2_GOTOFF_RELOCATION
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
- (flag_pic ? DW_EH_PE_aligned : DW_EH_PE_sdata4)
+ (flag_pic \
+ ? ((GLOBAL) \
+ ? DW_EH_PE_indirect | DW_EH_PE_absptr \
+ : DW_EH_PE_datarel | DW_EH_PE_sdata4) \
+ : DW_EH_PE_absptr)
+
+#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
+ do { \
+ if (((ENCODING) & 0xf0) == DW_EH_PE_datarel) \
+ { \
+ fputs ("\t.4byte %gotoff(", FILE); \
+ output_addr_const (FILE, ADDR); \
+ fputs (")", FILE); \
+ goto DONE; \
+ } \
+ } while (0)
+
+#else
+/* We don't have %gotoff support in the assembler. Fall back to the encoding
+ it used to use instead before the assembler was fixed. This has known
+ bugs but mostly works. */
+#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
+ (flag_pic \
+ ? ((GLOBAL) \
+ ? DW_EH_PE_indirect | DW_EH_PE_absptr \
+ : DW_EH_PE_aligned) \
+ : DW_EH_PE_absptr)
+#endif
/* Misc. parameters. */
fi
;;
+ nios2-*-*)
+ # Versions 2.33 and earlier lacked support for the %gotoff relocation
+ # syntax that is documented in the ABI specification.
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for support for %gotoff relocations in constant data" >&5
+$as_echo_n "checking assembler for support for %gotoff relocations in constant data... " >&6; }
+if ${gcc_cv_as_nios2_gotoff_relocation+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ gcc_cv_as_nios2_gotoff_relocation=no
+ if test x$gcc_cv_as != x; then
+ $as_echo ' .extern foo
+ .data
+ .long %gotoff(foo)' > conftest.s
+ if { ac_try='$gcc_cv_as $gcc_cv_as_flags -o conftest.o conftest.s >&5'
+ { { eval echo "\"\$as_me\":${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
+ gcc_cv_as_nios2_gotoff_relocation=yes
+ else
+ echo "configure: failed program was" >&5
+ cat conftest.s >&5
+ fi
+ rm -f conftest.o conftest.s
+ fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_nios2_gotoff_relocation" >&5
+$as_echo "$gcc_cv_as_nios2_gotoff_relocation" >&6; }
+if test $gcc_cv_as_nios2_gotoff_relocation = yes; then
+
+$as_echo "#define HAVE_AS_NIOS2_GOTOFF_RELOCATION 1" >>confdefs.h
+
+fi
+
+ ;;
riscv*-*-*)
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for .attribute support" >&5
$as_echo_n "checking assembler for .attribute support... " >&6; }
configured with --enable-newlib-nano-formatted-io.])
fi
;;
+ nios2-*-*)
+ # Versions 2.33 and earlier lacked support for the %gotoff relocation
+ # syntax that is documented in the ABI specification.
+ gcc_GAS_CHECK_FEATURE([support for %gotoff relocations in constant data],
+ gcc_cv_as_nios2_gotoff_relocation,,,
+[ .extern foo
+ .data
+ .long %gotoff(foo)],,
+ [AC_DEFINE(HAVE_AS_NIOS2_GOTOFF_RELOCATION, 1,
+ [Define if your assembler supports %gotoff relocation syntax.])])
+ ;;
riscv*-*-*)
gcc_GAS_CHECK_FEATURE([.attribute support],
gcc_cv_as_riscv_attribute, [2,32,0],,
+2020-01-31 Sandra Loosemore <sandra@codesourcery.com>
+
+ nios2: Support for GOT-relative DW_EH_PE_datarel encoding.
+
+ * g++.target/nios2/hello-pie.C: New.
+ * g++.target/nios2/nios2.exp: New.
+
2020-01-31 David Malcolm <dmalcolm@redhat.com>
PR analyzer/93457
--- /dev/null
+// { dg-do run { target *-*-linux* } }
+// { dg-options "-pie -fpie" }
+// { dg-output "Hello, pie World" }
+
+// This test used to give an "FDE encoding" error from the linker due to
+// the ABI not having appropriate relocations for PIE.
+
+#include <iostream>
+
+int
+main ()
+{
+ std::cout << "Hello, pie World" << std::endl;
+}
--- /dev/null
+# Copyright (C) 2019 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING3. If not see
+# <http://www.gnu.org/licenses/>.
+
+# GCC testsuite that uses the `dg.exp' driver.
+
+# Exit immediately if this isn't a nios2 target.
+if ![istarget nios2*-*-*] then {
+ return
+}
+
+# Load support procs.
+load_lib g++-dg.exp
+
+# Initialize `dg'.
+dg-init
+
+# Main loop.
+dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/*.C]] "" ""
+
+# All done.
+dg-finish
+2020-01-31 Sandra Loosemore <sandra@codesourcery.com>
+
+ nios2: Support for GOT-relative DW_EH_PE_datarel encoding.
+
+ * config.host [nios2-*-linux*] (tmake_file, tm_file): Adjust.
+ * config/nios2-elf-lib.h: New.
+ * unwind-dw2-fde-dip.c (_Unwind_IteratePhdrCallback): Use existing
+ code for finding GOT base for nios2.
+
2020-01-27 Martin Liska <mliska@suse.cz>
PR gcov-profile/93403
esac
;;
nios2-*-linux*)
- tmake_file="$tmake_file nios2/t-nios2 nios2/t-linux t-libgcc-pic t-slibgcc-libgcc"
+ tmake_file="$tmake_file nios2/t-nios2 nios2/t-linux t-libgcc-pic t-eh-dw2-dip t-slibgcc-libgcc"
+ tm_file="$tm_file nios2/elf-lib.h"
md_unwind_header=nios2/linux-unwind.h
;;
nios2-*-*)
--- /dev/null
+/* Target macros for the Nios II port of GCC.
+ Copyright (C) 2015-2020 Free Software Foundation, Inc.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+#define CRT_GET_RFIB_DATA(dbase) \
+ ({ extern void *_gp_got; (dbase) = &_gp_got; })
return 1;
#ifdef CRT_GET_RFIB_DATA
-# ifdef __i386__
+# if defined __i386__ || defined __nios2__
data->dbase = NULL;
if (p_dynamic)
{
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