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reflect: Use hand-coded .eh_frame section rather than CFI directives.
From Rainer Orth. From-SVN: r203120
This commit is contained in:
Ian Lance Taylor
parent
78cedfb1a3
commit
cc1a9ac808
@ -3,6 +3,9 @@
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/* Define if building universal (internal helper macro) */
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#undef AC_APPLE_UNIVERSAL_BUILD
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/* Define to the flags needed for the .section .eh_frame directive. */
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#undef EH_FRAME_FLAGS
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/* Define to 1 if you have the `accept4' function. */
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#undef HAVE_ACCEPT4
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@ -12,6 +15,15 @@
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/* Define to 1 if you have the `asinl' function. */
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#undef HAVE_ASINL
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/* Define if your assembler supports GNU comdat group syntax. */
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#undef HAVE_AS_COMDAT_GAS
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/* Define if your assembler supports unwind section type. */
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#undef HAVE_AS_X86_64_UNWIND_SECTION_TYPE
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/* Define if your assembler supports PC relative relocs. */
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#undef HAVE_AS_X86_PCREL
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/* Define to 1 if you have the `atan2l' function. */
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#undef HAVE_ATAN2L
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95
libgo/configure
vendored
95
libgo/configure
vendored
@ -15179,6 +15179,101 @@ $as_echo "#define SETCONTEXT_CLOBBERS_TLS 1" >>confdefs.h
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether .eh_frame section should be read-only" >&5
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$as_echo_n "checking whether .eh_frame section should be read-only... " >&6; }
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if test "${libgo_cv_ro_eh_frame+set}" = set; then :
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$as_echo_n "(cached) " >&6
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else
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libgo_cv_ro_eh_frame=no
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echo 'extern void foo (void); void bar (void) { foo (); foo (); }' > conftest.c
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if $CC $CFLAGS -S -fpic -fexceptions -o conftest.s conftest.c > /dev/null 2>&1; then
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if grep '.section.*eh_frame.*"a"' conftest.s > /dev/null; then
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libgo_cv_ro_eh_frame=yes
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elif grep '.section.*eh_frame.*#alloc' conftest.c \
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| grep -v '#write' > /dev/null; then
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libgo_cv_ro_eh_frame=yes
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fi
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fi
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rm -f conftest.*
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_ro_eh_frame" >&5
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$as_echo "$libgo_cv_ro_eh_frame" >&6; }
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if test "x$libgo_cv_ro_eh_frame" = xyes; then
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$as_echo "#define EH_FRAME_FLAGS \"a\"" >>confdefs.h
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else
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$as_echo "#define EH_FRAME_FLAGS \"aw\"" >>confdefs.h
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if assembler supports GNU comdat group syntax" >&5
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$as_echo_n "checking if assembler supports GNU comdat group syntax... " >&6; }
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if test "${libgo_cv_as_comdat_gnu+set}" = set; then :
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$as_echo_n "(cached) " >&6
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else
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echo '.section .text,"axG",@progbits,.foo,comdat' > conftest.s
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if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then
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libgo_cv_as_comdat_gnu=yes
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else
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libgo_cv_as_comdat_gnu=no
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fi
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_as_comdat_gnu" >&5
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$as_echo "$libgo_cv_as_comdat_gnu" >&6; }
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if test "x$libgo_cv_as_comdat_gnu" = xyes; then
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$as_echo "#define HAVE_AS_COMDAT_GAS 1" >>confdefs.h
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler supports pc related relocs" >&5
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$as_echo_n "checking assembler supports pc related relocs... " >&6; }
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if test "${libgo_cv_as_x86_pcrel+set}" = set; then :
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$as_echo_n "(cached) " >&6
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else
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libgo_cv_as_x86_pcrel=yes
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echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
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if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then
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libgo_cv_as_x86_pcrel=no
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fi
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_as_x86_pcrel" >&5
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$as_echo "$libgo_cv_as_x86_pcrel" >&6; }
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if test "x$libgo_cv_as_x86_pcrel" = xyes; then
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$as_echo "#define HAVE_AS_X86_PCREL 1" >>confdefs.h
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler supports unwind section type" >&5
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$as_echo_n "checking assembler supports unwind section type... " >&6; }
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if test "${libgo_cv_as_x86_64_unwind_section_type+set}" = set; then :
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$as_echo_n "(cached) " >&6
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else
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libgo_cv_as_x86_64_unwind_section_type=yes
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echo '.section .eh_frame,"a",@unwind' > conftest.s
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if $CC $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then
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libgo_cv_as_x86_64_unwind_section_type=no
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fi
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_as_x86_64_unwind_section_type" >&5
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$as_echo "$libgo_cv_as_x86_64_unwind_section_type" >&6; }
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if test "x$libgo_cv_as_x86_64_unwind_section_type" = xyes; then
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$as_echo "#define HAVE_AS_X86_64_UNWIND_SECTION_TYPE 1" >>confdefs.h
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fi
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cat >confcache <<\_ACEOF
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# This file is a shell script that caches the results of configure
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# tests run on this system so they can be shared between configure
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@ -757,6 +757,68 @@ if test "$libgo_cv_lib_setcontext_clobbers_tls" = "yes"; then
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[Define if setcontext clobbers TLS variables])
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fi
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AC_CACHE_CHECK([whether .eh_frame section should be read-only],
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libgo_cv_ro_eh_frame, [
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libgo_cv_ro_eh_frame=no
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echo 'extern void foo (void); void bar (void) { foo (); foo (); }' > conftest.c
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if $CC $CFLAGS -S -fpic -fexceptions -o conftest.s conftest.c > /dev/null 2>&1; then
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if grep '.section.*eh_frame.*"a"' conftest.s > /dev/null; then
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libgo_cv_ro_eh_frame=yes
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elif grep '.section.*eh_frame.*#alloc' conftest.c \
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| grep -v '#write' > /dev/null; then
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libgo_cv_ro_eh_frame=yes
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fi
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fi
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rm -f conftest.*
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])
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if test "x$libgo_cv_ro_eh_frame" = xyes; then
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AC_DEFINE(EH_FRAME_FLAGS, "a",
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[Define to the flags needed for the .section .eh_frame directive.])
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else
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AC_DEFINE(EH_FRAME_FLAGS, "aw",
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[Define to the flags needed for the .section .eh_frame directive.])
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fi
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AC_CACHE_CHECK([if assembler supports GNU comdat group syntax],
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libgo_cv_as_comdat_gnu, [
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echo '.section .text,"axG",@progbits,.foo,comdat' > conftest.s
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if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then
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libgo_cv_as_comdat_gnu=yes
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else
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libgo_cv_as_comdat_gnu=no
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fi
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])
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if test "x$libgo_cv_as_comdat_gnu" = xyes; then
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AC_DEFINE(HAVE_AS_COMDAT_GAS, 1,
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[Define if your assembler supports GNU comdat group syntax.])
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fi
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AC_CACHE_CHECK([assembler supports pc related relocs],
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libgo_cv_as_x86_pcrel, [
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libgo_cv_as_x86_pcrel=yes
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echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
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if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then
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libgo_cv_as_x86_pcrel=no
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fi
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])
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if test "x$libgo_cv_as_x86_pcrel" = xyes; then
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AC_DEFINE(HAVE_AS_X86_PCREL, 1,
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[Define if your assembler supports PC relative relocs.])
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fi
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AC_CACHE_CHECK([assembler supports unwind section type],
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libgo_cv_as_x86_64_unwind_section_type, [
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libgo_cv_as_x86_64_unwind_section_type=yes
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echo '.section .eh_frame,"a",@unwind' > conftest.s
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if $CC $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then
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libgo_cv_as_x86_64_unwind_section_type=no
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fi
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])
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if test "x$libgo_cv_as_x86_64_unwind_section_type" = xyes; then
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AC_DEFINE(HAVE_AS_X86_64_UNWIND_SECTION_TYPE, 1,
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[Define if your assembler supports unwind section type.])
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fi
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AC_CACHE_SAVE
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if test ${multilib} = yes; then
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@ -4,6 +4,8 @@
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# MakeFunc 386 assembly code.
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#include "config.h"
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.global reflect.makeFuncStub
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#ifdef __ELF__
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@ -11,7 +13,7 @@
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#endif
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reflect.makeFuncStub:
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.cfi_startproc
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.LFB1:
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# Go does not provide any equivalent to the regparm function
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# attribute, so on Go we do not need to worry about passing
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@ -27,15 +29,12 @@ reflect.makeFuncStub:
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# }
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pushl %ebp
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.cfi_def_cfa_offset 8
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.cfi_offset %ebp, -8
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.LCFI0:
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movl %esp, %ebp
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.cfi_def_cfa_register %ebp
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.LCFI1:
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pushl %ebx # In case this is PIC.
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subl $36, %esp # Enough for args and to align stack.
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.cfi_offset %ebx, -12
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.LCFI2:
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#ifdef __PIC__
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call __x86.get_pc_thunk.bx
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@ -75,36 +74,123 @@ reflect.makeFuncStub:
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addl $36, %esp
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popl %ebx
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.cfi_restore %ebx
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.LCFI3:
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popl %ebp
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.cfi_restore %ebp
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.cfi_def_cfa %esp, 4
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.LCFI4:
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ret
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.cfi_endproc
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.LFE1:
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#ifdef __ELF__
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.size reflect.makeFuncStub, . - reflect.makeFuncStub
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#endif
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#ifdef __PIC__
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#ifdef HAVE_AS_COMDAT_GAS
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.section .text.__x86.get_pc_thunk.bx,"axG",@progbits,__x86.get_pc_thunk.bx,comdat
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#else
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/* Sun as needs a different syntax. */
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.section .text.__x86.get_pc_thunk.bx%__x86.get_pc_thunk.bx,"ax",@progbits
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.group __x86.get_pc_thunk.bx,.text.__x86.get_pc_thunk.bx%__x86.get_pc_thunk.bx,#comdat
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#endif
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.globl __x86.get_pc_thunk.bx
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.hidden __x86.get_pc_thunk.bx
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#ifdef __ELF__
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.type __x86.get_pc_thunk.bx, @function
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#endif
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__x86.get_pc_thunk.bx:
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.cfi_startproc
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.LFB2:
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movl (%esp), %ebx
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ret
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.cfi_endproc
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.LFE2:
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#ifdef __ELF__
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.size __x86.get_pc_thunk.bx, . - __x86.get_pc_thunk.bx
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#endif
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#endif
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#ifdef __ELF__
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#if defined __PIC__
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# if defined __sun__ && defined __svr4__
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/* 32-bit Solaris 2/x86 uses datarel encoding for PIC. GNU ld before 2.22
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doesn't correctly sort .eh_frame_hdr with mixed encodings, so match this. */
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# define FDE_ENCODING 0x30 /* datarel */
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# define FDE_ENCODE(X) X@GOTOFF
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# else
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# define FDE_ENCODING 0x1b /* pcrel sdata4 */
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# if defined HAVE_AS_X86_PCREL
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# define FDE_ENCODE(X) X-.
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# else
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# define FDE_ENCODE(X) X@rel
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# endif
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# endif
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#else
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# define FDE_ENCODING 0 /* absolute */
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# define FDE_ENCODE(X) X
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#endif
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.section .eh_frame,EH_FRAME_FLAGS,@progbits
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.Lframe1:
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.long .LECIE1-.LSCIE1 /* Length of Common Information Entry */
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.LSCIE1:
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.long 0x0 /* CIE Identifier Tag */
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.byte 0x1 /* CIE Version */
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.ascii "zR\0" /* CIE Augmentation */
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.byte 0x1 /* .uleb128 0x1; CIE Code Alignment Factor */
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.byte 0x7c /* .sleb128 -4; CIE Data Alignment Factor */
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.byte 0x8 /* CIE RA Column */
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.byte 0x1 /* .uleb128 0x1; Augmentation size */
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.byte FDE_ENCODING
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.byte 0xc /* DW_CFA_def_cfa */
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.byte 0x4 /* .uleb128 0x4 */
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.byte 0x4 /* .uleb128 0x4 */
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.byte 0x88 /* DW_CFA_offset, column 0x8 */
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.byte 0x1 /* .uleb128 0x1 */
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.align 4
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.LECIE1:
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.LSFDE1:
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.long .LEFDE1-.LASFDE1 /* FDE Length */
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.LASFDE1:
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.long .LASFDE1-.Lframe1 /* FDE CIE offset */
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.long FDE_ENCODE(.LFB1) /* FDE initial location */
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.long .LFE1-.LFB1 /* FDE address range */
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.byte 0x0 /* .uleb128 0x0; Augmentation size */
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.byte 0x4 /* DW_CFA_advance_loc4 */
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.long .LCFI0-.LFB1
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.byte 0xe /* DW_CFA_def_cfa_offset */
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.byte 0x8 /* .uleb128 0x8 */
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.byte 0x85 /* DW_CFA_offset, column 0x5 */
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.byte 0x2 /* .uleb128 0x2 */
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.byte 0x4 /* DW_CFA_advance_loc4 */
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.long .LCFI1-.LCFI0
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.byte 0xd /* DW_CFA_def_cfa_register */
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.byte 0x5 /* .uleb128 0x5 */
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.byte 0x4 /* DW_CFA_advance_loc4 */
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.long .LCFI2-.LCFI1
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.byte 0x83 /* .DW_CFA_offset, column 0x3 */
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.byte 0x3 /* .uleb128 0x3 */
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.byte 0x4 /* DW_CFA_advance_loc4 */
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.long .LCFI3-.LCFI2
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.byte 0xc3 /* DW_CFA_restore, column 0x3 */
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.byte 0x4 /* DW_CFA_advance_loc4 */
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.long .LCFI4-.LCFI3
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.byte 0xc5 /* DW_CFA_restore, column 0x5 */
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.byte 0xc /* DW_CFA_def_cfa */
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.byte 0x4 /* .uleb128 0x4 */
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.byte 0x4 /* .uleb128 0x4 */
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.align 4
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.LEFDE1:
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#ifdef __PIC__
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.LSFDE2:
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.long .LEFDE2-.LASFDE2 /* FDE Length */
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.LASFDE2:
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.long .LASFDE2-.Lframe1 /* FDE CIE offset */
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.long FDE_ENCODE(.LFB2) /* FDE initial location */
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.long .LFE2-.LFB2 /* FDE address range */
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.byte 0x0 /* .uleb128 0x0; Augmentation size */
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.align 4
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.LEFDE2:
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#endif /* __PIC__ */
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#endif /* __ELF__ */
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#if defined(__ELF__) && defined(__linux__)
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.section .note.GNU-stack,"",@progbits
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.section .note.GNU-split-stack,"",@progbits
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.section .note.GNU-no-split-stack,"",@progbits
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@ -4,6 +4,8 @@
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# MakeFunc amd64 assembly code.
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#include "config.h"
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.global reflect.makeFuncStub
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#ifdef __ELF__
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@ -11,7 +13,7 @@
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#endif
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reflect.makeFuncStub:
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.cfi_startproc
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.LFB1:
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# Store all the parameter registers in a struct that looks
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# like:
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@ -35,10 +37,9 @@ reflect.makeFuncStub:
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# };
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pushq %rbp
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.cfi_def_cfa_offset 16
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.cfi_offset %rbp, -16
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.LCFI0:
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movq %rsp, %rbp
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.cfi_def_cfa_register %rbp
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.LCFI1:
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subq $0xc0, %rsp # Space for struct on stack.
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@ -91,16 +92,70 @@ reflect.makeFuncStub:
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# double type.
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leave
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.cfi_def_cfa %rsp, 8
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.LCFI2:
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ret
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.LFE1:
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.cfi_endproc
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#ifdef __ELF__
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.size reflect.makeFuncStub, . - reflect.makeFuncStub
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#endif
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#ifdef __ELF__
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#ifdef HAVE_AS_X86_64_UNWIND_SECTION_TYPE
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.section .eh_frame,"a",@unwind
|
||||
#else
|
||||
.section .eh_frame,"a",@progbits
|
||||
#endif
|
||||
.Lframe1:
|
||||
.long .LECIE1-.LSCIE1 /* Length of Common Information Entry */
|
||||
.LSCIE1:
|
||||
.long 0x0 /* CIE Identifier Tag */
|
||||
.byte 0x1 /* CIE Version */
|
||||
.ascii "zR\0" /* CIE Augmentation */
|
||||
.uleb128 1 /* CIE Code Alignment Factor */
|
||||
.sleb128 -8 /* CIE Data Alignment Factor */
|
||||
.byte 0x10 /* CIE RA Column */
|
||||
.uleb128 1 /* Augmentation size */
|
||||
.byte 0x1b /* FDE Encoding (pcrel sdata4) */
|
||||
.byte 0xc /* DW_CFA_def_cfa, %rsp offset 8 */
|
||||
.uleb128 7
|
||||
.uleb128 8
|
||||
.byte 0x80+16 /* DW_CFA_offset, %rip offset 1*-8 */
|
||||
.uleb128 1
|
||||
.align 8
|
||||
.LECIE1:
|
||||
.LSFDE1:
|
||||
.long .LEFDE1-.LASFDE1 /* FDE Length */
|
||||
.LASFDE1:
|
||||
.long .LASFDE1-.Lframe1 /* FDE CIE offset */
|
||||
#if HAVE_AS_X86_PCREL
|
||||
.long .LFB1-. /* FDE initial location */
|
||||
#else
|
||||
.long .LFB1@rel
|
||||
#endif
|
||||
.long .LFE1-.LFB1 /* FDE address range */
|
||||
.uleb128 0x0 /* Augmentation size */
|
||||
.byte 0x4 /* DW_CFA_advance_loc4 */
|
||||
.long .LCFI0-.LFB1
|
||||
.byte 0xe /* DW_CFA_def_cfa_offset */
|
||||
.uleb128 16
|
||||
.byte 0x86 /* DW_CFA_offset, column 0x6 */
|
||||
.uleb128 2
|
||||
.byte 0x4 /* DW_CFA_advance_loc4 */
|
||||
.long .LCFI1-.LCFI0
|
||||
.byte 0xd /* DW_CFA_def_cfa_register */
|
||||
.uleb128 6
|
||||
.byte 0x2 /* DW_CFA_advance_loc1 */
|
||||
.byte .LCFI2-.LCFI1
|
||||
.byte 0xc /* DW_CFA_def_cfa */
|
||||
.uleb128 7
|
||||
.uleb128 8
|
||||
.align 8
|
||||
.LEFDE1:
|
||||
#endif /* __ELF__ */
|
||||
|
||||
#if defined(__ELF__) && defined(__linux__)
|
||||
.section .note.GNU-stack,"",@progbits
|
||||
.section .note.GNU-split-stack,"",@progbits
|
||||
.section .note.GNU-no-split-stack,"",@progbits
|
||||
|
||||
Loading…
Reference in New Issue
Block a user