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Tidy up the default ELF linker script

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This commit is contained in:
Nick Clifton
2024-11-27 11:23:38 +00:00
parent 7a55d8e4df
commit fe217087a4
1 changed files with 356 additions and 126 deletions
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482
ld/scripttempl/elf.sc
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@@ -115,6 +115,48 @@
#
# Each of these can also have corresponding .rel.* and .rela.* sections.
# ------------------------------------------------------------------------
# The multiple forms of conditional shell script syntax that are used in
# this file can be confusing, so here is a quick explanation of how they
# work:
#
# The following all mean "if foo is defined then do/insert <stuff>":
#
# test -z "$foo" || <stuff>
# test -n "$foo" && <stuff>
# if test -n "$foo"; then <stuff>
# if [ -n "$foo" ]; then <stuff>
# ${foo-<stuff>}
#
# Whereas the following all mean "if foo is undefined then do/insert <stuff>":
#
# test -n "$foo" || <stuff>
# test -z "$foo" && <stuff>
# if test -z "$foo"; then <stuff>
# if [ -z "$foo" ]; then <stuff>
# ${foo+<stuff>}
#
# If multiple symbols are tested together then they operate as an IOR for
# positive tests and a NOR for negative tests. ie, the following all do
# <stuff> if either or both of <foo> and <bar> are defined:
#
# test -z "$foo$bar" || <stuff>
# test -n "$foo$bar" && <stuff>
# if test -n "$foo$bar"; then <stuff>
#
# Whilst the following only do <stuff> if neither <foo> nor <bar> are defined:
#
# test -n "$foo$bar" || <stuff>
# if -z "$foo$bar"; then <stuff>
# test -z "$foo$bar" && <stuff>
#
# Also:
# foo=${foo-${bar-${baz}}}
# means:
# If foo is defined, leave it unchanged. Otherwise if bar is defined
# then set foo equal to bar, otherwise set foo equal to baz.
# ------------------------------------------------------------------------
if test -n "$NOP"; then
FILL="=$NOP"
else
@@ -136,6 +178,7 @@ test "$LD_FLAG" = "N" && DATA_ADDR=.
test -z "${ETEXT_NAME}" && ETEXT_NAME=${USER_LABEL_PREFIX}etext
test -n "$RELRO_NOW" && unset SEPARATE_GOTPLT
test -z "$ATTRS_SECTIONS" && ATTRS_SECTIONS=".gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }"
if test -z "$DATA_SEGMENT_ALIGN"; then
test -n "$CREATE_SHLIB$CREATE_PIE" && test -n "$SHLIB_DATA_ADDR" && COMMONPAGESIZE=""
test -z "$CREATE_SHLIB$CREATE_PIE" && test -n "$DATA_ADDR" && COMMONPAGESIZE=""
@@ -144,7 +187,8 @@ if test -z "$DATA_SEGMENT_ALIGN"; then
DATA_SEGMENT_END=""
if test -n "${COMMONPAGESIZE}"; then
if test "${SEGMENT_SIZE}" != "${MAXPAGESIZE}"; then
DATA_SEGMENT_ALIGN="ALIGN (${SEGMENT_SIZE}) - ((${MAXPAGESIZE} - .) & (${MAXPAGESIZE} - 1)); . = DATA_SEGMENT_ALIGN (${MAXPAGESIZE}, ${COMMONPAGESIZE})"
DATA_SEGMENT_ALIGN="ALIGN (${SEGMENT_SIZE}) - ((${MAXPAGESIZE} - .) & (${MAXPAGESIZE} - 1)); \
. = DATA_SEGMENT_ALIGN (${MAXPAGESIZE}, ${COMMONPAGESIZE})"
else
DATA_SEGMENT_ALIGN="DATA_SEGMENT_ALIGN (${MAXPAGESIZE}, ${COMMONPAGESIZE})"
fi
@@ -152,15 +196,19 @@ if test -z "$DATA_SEGMENT_ALIGN"; then
DATA_SEGMENT_RELRO_END=". = DATA_SEGMENT_RELRO_END (${SEPARATE_GOTPLT-0}, .);"
fi
fi
if test -z "${INITIAL_READONLY_SECTIONS}${CREATE_SHLIB}"; then
INITIAL_READONLY_SECTIONS=".interp ${RELOCATING-0} : { *(.interp) }"
fi
if test -z "$PLT"; then
IPLT=".iplt ${RELOCATING-0} : { *(.iplt) }"
PLT=".plt ${RELOCATING-0} : { *(.plt)${RELOCATING+${IREL_IN_PLT+ *(.iplt)}} }
${IREL_IN_PLT-$IPLT}"
fi
test -n "${DATA_PLT-${BSS_PLT-text}}" && TEXT_PLT=
if test -z "$GOT"; then
if test -z "$SEPARATE_GOTPLT"; then
GOT=".got ${RELOCATING-0} : {${RELOCATING+ *(.got.plt) *(.igot.plt)} *(.got)${RELOCATING+ *(.igot)} }"
@@ -233,17 +281,21 @@ if test -z "${NO_SMALL_DATA}"; then
else
NO_SMALL_DATA=" "
fi
if test -z "${SDATA_GOT}${DATA_GOT}"; then
if test -n "${NO_SMALL_DATA}"; then
DATA_GOT=" "
fi
fi
if test -z "${SDATA_GOT}${DATA_GOT}"; then
if test -z "${NO_SMALL_DATA}"; then
SDATA_GOT=" "
fi
fi
test -n "$SEPARATE_GOTPLT" && SEPARATE_GOTPLT=" "
test "${LARGE_SECTIONS}" = "yes" && REL_LARGE="
.rel.ldata ${RELOCATING-0} : { *(.rel.ldata${RELOCATING+ .rel.ldata.* .rel.gnu.linkonce.l.*}) }
.rela.ldata ${RELOCATING-0} : { *(.rela.ldata${RELOCATING+ .rela.ldata.* .rela.gnu.linkonce.l.*}) }
@@ -251,23 +303,7 @@ test "${LARGE_SECTIONS}" = "yes" && REL_LARGE="
.rela.lbss ${RELOCATING-0} : { *(.rela.lbss${RELOCATING+ .rela.lbss.* .rela.gnu.linkonce.lb.*}) }
.rel.lrodata ${RELOCATING-0} : { *(.rel.lrodata${RELOCATING+ .rel.lrodata.* .rel.gnu.linkonce.lr.*}) }
.rela.lrodata ${RELOCATING-0} : { *(.rela.lrodata${RELOCATING+ .rela.lrodata.* .rela.gnu.linkonce.lr.*}) }"
test "${LARGE_SECTIONS}" = "yes" && LARGE_BSS="
.lbss ${RELOCATING-0} :
{
${RELOCATING+*(.dynlbss)}
*(.lbss${RELOCATING+ .lbss.* .gnu.linkonce.lb.*})
${RELOCATING+*(LARGE_COMMON)}
}"
test "${LARGE_SECTIONS}" = "yes" && LARGE_SECTIONS="
.lrodata ${RELOCATING-0} ${RELOCATING+ALIGN(${MAXPAGESIZE}) + (. & (${MAXPAGESIZE} - 1))} :
{
*(.lrodata${RELOCATING+ .lrodata.* .gnu.linkonce.lr.*})
}
.ldata ${RELOCATING-0} ${RELOCATING+ALIGN(${MAXPAGESIZE}) + (. & (${MAXPAGESIZE} - 1))} :
{
*(.ldata${RELOCATING+ .ldata.* .gnu.linkonce.l.*})
${RELOCATING+. = ALIGN(. != 0 ? ${ALIGNMENT} : 1);}
}"
if test "${ENABLE_INITFINI_ARRAY}" = "yes"; then
SORT_INIT_ARRAY="KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))"
SORT_FINI_ARRAY="KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))"
@@ -279,26 +315,6 @@ else
CTORS_IN_INIT_ARRAY=
DTORS_IN_FINI_ARRAY=
fi
PREINIT_ARRAY=".preinit_array :
{
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__preinit_array_start"));}
KEEP (*(.preinit_array))
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__preinit_array_end"));}
}"
INIT_ARRAY=".init_array :
{
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__init_array_start"));}
${SORT_INIT_ARRAY}
KEEP (*(.init_array ${CTORS_IN_INIT_ARRAY}))
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__init_array_end"));}
}"
FINI_ARRAY=".fini_array :
{
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__fini_array_start"));}
${SORT_FINI_ARRAY}
KEEP (*(.fini_array ${DTORS_IN_FINI_ARRAY}))
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__fini_array_end"));}
}"
CTOR=".ctors ${CONSTRUCTING-0} :
{
${CONSTRUCTING+${CTOR_START}}
@@ -335,32 +351,6 @@ DTOR=".dtors ${CONSTRUCTING-0} :
KEEP (*(.dtors))
${CONSTRUCTING+${DTOR_END}}
}"
STACK=".stack ${RELOCATING-0}${RELOCATING+${STACK_ADDR}} :
{
${RELOCATING+$(def_symbol "_stack");}
*(.stack)
${RELOCATING+${STACK_SENTINEL}}
}"
test "${HAVE_NOINIT}" = "yes" && NOINIT="
/* This section contains data that is not initialized during load,
or during the application's initialization sequence. */
.noinit ${RELOCATING-0} (NOLOAD) : ${RELOCATING+ALIGN(${ALIGNMENT})}
{
${RELOCATING+PROVIDE (__noinit_start = .);}
*(.noinit${RELOCATING+ .noinit.* .gnu.linkonce.n.*})
${RELOCATING+. = ALIGN(${ALIGNMENT});}
${RELOCATING+PROVIDE (__noinit_end = .);}
}"
test "${HAVE_PERSISTENT}" = "yes" && PERSISTENT="
/* This section contains data that is initialized during load,
but not during the application's initialization sequence. */
.persistent ${RELOCATING-0} : ${RELOCATING+ALIGN(${ALIGNMENT})}
{
${RELOCATING+PROVIDE (__persistent_start = .);}
*(.persistent${RELOCATING+ .persistent.* .gnu.linkonce.p.*})
${RELOCATING+. = ALIGN(${ALIGNMENT});}
${RELOCATING+PROVIDE (__persistent_end = .);}
}"
TEXT_START_ADDR="SEGMENT_START(\"text-segment\", ${TEXT_START_ADDR})"
SHLIB_TEXT_START_ADDR="SEGMENT_START(\"text-segment\", ${SHLIB_TEXT_START_ADDR:-0})"
@@ -410,6 +400,20 @@ cat <<EOF
EOF
}
align_to_default_symbol_alignment()
{
cat <<EOF
${RELOCATING+. = ALIGN(${ALIGNMENT});}
EOF
}
align_to_default_section_alignment()
{
cat <<EOF
${RELOCATING+. = ALIGN(. != 0 ? ${ALIGNMENT} : 1);}
EOF
}
emit_header()
{
cat <<EOF
@@ -419,8 +423,7 @@ cat <<EOF
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. */
OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
"${LITTLE_OUTPUT_FORMAT}")
OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}", "${LITTLE_OUTPUT_FORMAT}")
OUTPUT_ARCH(${OUTPUT_ARCH})
${RELOCATING+ENTRY(${ENTRY})}
@@ -436,20 +439,61 @@ EOF
emit_early_ro()
{
cat <<EOF
cat <<EOF
${INITIAL_READONLY_SECTIONS}
EOF
}
emit_noinit()
{
if test "${HAVE_NOINIT}" != "yes"; then
return
fi
cat <<EOF
/* This section contains data that is not initialized during load,
or during the application's initialization sequence. */
.noinit ${RELOCATING-0} (NOLOAD) : ${RELOCATING+ALIGN(${ALIGNMENT})}
{
${RELOCATING+PROVIDE (__noinit_start = .);}
*(.noinit${RELOCATING+ .noinit.* .gnu.linkonce.n.*})
$(align_to_default_symbol_alignment)
${RELOCATING+PROVIDE (__noinit_end = .);}
}
EOF
}
emit_persistent()
{
if test "${HAVE_PERSISTENT}" != "yes"; then
return
fi
cat <<EOF
/* This section contains data that is initialized during load,
but not during the application's initialization sequence. */
.persistent ${RELOCATING-0} : ${RELOCATING+ALIGN(${ALIGNMENT})}
{
${RELOCATING+PROVIDE (__persistent_start = .);}
*(.persistent${RELOCATING+ .persistent.* .gnu.linkonce.p.*})
$(align_to_default_symbol_alignment)
${RELOCATING+PROVIDE (__persistent_end = .);}
}
EOF
}
emit_executable_start()
{
cat <<EOF
${RELOCATING+${SEPARATE_TEXT-/* Read-only sections, merged into text segment: */}}
${CREATE_SHLIB-${CREATE_PIE-${RELOCATING+PROVIDE (__executable_start = ${TEXT_START_ADDR}); . = ${TEXT_BASE_ADDRESS};}}}
${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR}${SIZEOF_HEADERS_CODE};}}
${CREATE_PIE+${RELOCATING+PROVIDE (__executable_start = ${SHLIB_TEXT_START_ADDR}); . = ${SHLIB_TEXT_START_ADDR}${SIZEOF_HEADERS_CODE};}}
/* Place build-id as close to the ELF headers as possible. This
${CREATE_SHLIB-${CREATE_PIE-${RELOCATING+PROVIDE (__executable_start = ${TEXT_START_ADDR});
. = ${TEXT_BASE_ADDRESS};}}}
${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR}${SIZEOF_HEADERS_CODE};}}
${CREATE_PIE+${RELOCATING+PROVIDE (__executable_start = ${SHLIB_TEXT_START_ADDR});
. = ${SHLIB_TEXT_START_ADDR}${SIZEOF_HEADERS_CODE};}}
/* Place the build-id as close to the ELF headers as possible. This
maximises the chance the build-id will be present in core files,
which GDB can then use to locate the associated debuginfo file. */
.note.gnu.build-id ${RELOCATING-0}: { *(.note.gnu.build-id) }
@@ -458,8 +502,8 @@ EOF
emit_dyn()
{
test -n "${RELOCATING+0}" || unset NON_ALLOC_DYN
test -z "${NON_ALLOC_DYN}" || TEXT_DYNAMIC=
test -n "${RELOCATING+0}" || unset NON_ALLOC_DYN
test -z "${NON_ALLOC_DYN}" || TEXT_DYNAMIC=
cat > ldscripts/dyntmp.$$ <<EOF
${TEXT_DYNAMIC+${DYNAMIC}}
@@ -523,16 +567,21 @@ cat >> ldscripts/dyntmp.$$ <<EOF
.rel.dyn ${RELOCATING-0} :
{
EOF
sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rela\./d;/__rela_iplt_/d;s/^.*: { *\(.*\)}$/ \1/' $COMBRELOC >> ldscripts/dyntmp.$$
cat >> ldscripts/dyntmp.$$ <<EOF
}
.rela.dyn ${RELOCATING-0} :
{
EOF
sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rel\./d;/__rel_iplt_/d;s/^.*: { *\(.*\)}/ \1/' $COMBRELOC >> ldscripts/dyntmp.$$
cat >> ldscripts/dyntmp.$$ <<EOF
}
EOF
fi
cat >> ldscripts/dyntmp.$$ <<EOF
@@ -565,7 +614,7 @@ EOF
fi
rm -f ldscripts/dyntmp.$$
if test -n "${HAVE_DT_RELR}"; then
echo " .relr.dyn : { *(.relr.dyn) }"
fi
@@ -573,15 +622,18 @@ EOF
align_text()
{
if test -n "$TEXT_SEGMENT_ALIGN"; then
cat <<EOF
${RELOCATING+/* Align the text segment. */}
${RELOCATING+${TEXT_SEGMENT_ALIGN}}
EOF
fi
}
emit_text()
{
cat <<EOF
/* Start of the executable code region. */
.init ${RELOCATING-0}${RELOCATING+${INIT_ADDR}} :
{
${RELOCATING+${INIT_START}}
@@ -613,35 +665,41 @@ cat <<EOF
KEEP (*(SORT_NONE(.fini)))
${RELOCATING+${FINI_END}}
} ${FILL}
EOF
}
emit_text_end_symbols()
{
cat <<EOF
${RELOCATING+${ETEXT_LAST_IN_RODATA_SEGMENT-PROVIDE (__${ETEXT_NAME} = .);}}
${RELOCATING+${ETEXT_LAST_IN_RODATA_SEGMENT-PROVIDE (_${ETEXT_NAME} = .);}}
${RELOCATING+${ETEXT_LAST_IN_RODATA_SEGMENT-PROVIDE (${ETEXT_NAME} = .);}}
${RELOCATING+${TEXT_SEGMENT_ALIGN}}
EOF
}
align_rodata()
{
cat <<EOF
/* Start of the Read Only Data region. */
EOF
if test -n "${SEPARATE_CODE}${SEPARATE_TEXT}"; then
if test -n "${RODATA_ADDR}"; then
RODATA_ADDR="\
SEGMENT_START(\"rodata-segment\", ${RODATA_ADDR}) + SIZEOF_HEADERS"
RODATA_ADDR="SEGMENT_START(\"rodata-segment\", ${RODATA_ADDR}) + SIZEOF_HEADERS"
else
RODATA_ADDR="ALIGN(${SEGMENT_SIZE}) + (. & (${MAXPAGESIZE} - 1))"
RODATA_ADDR="SEGMENT_START(\"rodata-segment\", ${RODATA_ADDR})"
fi
if test -n "${SHLIB_RODATA_ADDR}"; then
SHLIB_RODATA_ADDR="\
SEGMENT_START(\"rodata-segment\", ${SHLIB_RODATA_ADDR}) + SIZEOF_HEADERS"
SHLIB_RODATA_ADDR="SEGMENT_START(\"rodata-segment\", ${SHLIB_RODATA_ADDR}) + SIZEOF_HEADERS"
else
SHLIB_RODATA_ADDR="ALIGN(${SEGMENT_SIZE}) + (. & (${MAXPAGESIZE} - 1))"
SHLIB_RODATA_ADDR="SEGMENT_START(\"rodata-segment\", ${SHLIB_RODATA_ADDR})"
fi
cat <<EOF
cat <<EOF
${RELOCATING+/* Adjust the address for the rodata segment. We want to adjust up to
the same address within the page on the next page up. */
${CREATE_SHLIB-${CREATE_PIE-. = ${RODATA_ADDR};}}
@@ -664,12 +722,16 @@ cat <<EOF
.sframe ${RELOCATING-0} : ONLY_IF_RO { *(.sframe)${RELOCATING+ *(.sframe.*)} }
.gcc_except_table ${RELOCATING-0} : ONLY_IF_RO { *(.gcc_except_table${RELOCATING+ .gcc_except_table.*}) }
.gnu_extab ${RELOCATING-0} : ONLY_IF_RO { *(.gnu_extab*) }
/* These sections are generated by the Sun/Oracle C++ compiler. */
.exception_ranges ${RELOCATING-0} : ONLY_IF_RO { *(.exception_ranges${RELOCATING+*}) }
${TEXT_PLT+${PLT_NEXT_DATA+${PLT} ${OTHER_PLT_SECTIONS}}}
/* Various note sections. Placed here so that they are included in the
read-only segment, and so that they are not treated as orphan sections. */
/* Various note sections. Placed here so that they are always included
in the read-only segment and not treated as orphan sections. The
current orphan handling algorithm does place note sections after R/O
data, but this is not guaranteed to always be the case. */
.note.build-id : { *(.note.build-id) } ${RELOCATING+${REGION}}
.note.GNU-stack : { *(.note.GNU-stack) } ${RELOCATING+${REGION}}
.note.gnu-property : { *(.note.gnu-property) } ${RELOCATING+${REGION}}
@@ -685,23 +747,57 @@ cat <<EOF
EOF
}
emit_data()
align_data()
{
cat <<EOF
/* Start of the Read Write Data region. */
${RELOCATING+/* Adjust the address for the data segment. We want to adjust up to
the same address within the page on the next page up. */}
${CREATE_SHLIB-${CREATE_PIE-${RELOCATING+. = ${DATA_ADDR-${DATA_SEGMENT_ALIGN}};}}}
${CREATE_SHLIB+. = ${SHLIB_DATA_ADDR-${DATA_SEGMENT_ALIGN}};}
${CREATE_PIE+. = ${SHLIB_DATA_ADDR-${DATA_SEGMENT_ALIGN}};}
EOF
}
/* Exception handling */
emit_init_fini_arrays()
{
cat <<EOF
.preinit_array :
{
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__preinit_array_start"));}
KEEP (*(.preinit_array))
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__preinit_array_end"));}
}
.init_array :
{
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__init_array_start"));}
${SORT_INIT_ARRAY}
KEEP (*(.init_array ${CTORS_IN_INIT_ARRAY}))
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__init_array_end"));}
}
.fini_array :
{
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__fini_array_start"));}
${SORT_FINI_ARRAY}
KEEP (*(.fini_array ${DTORS_IN_FINI_ARRAY}))
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__fini_array_end"));}
}
EOF
}
emit_data()
{
cat <<EOF
/* Exception handling. */
.eh_frame ${RELOCATING-0} : ONLY_IF_RW { KEEP (*(.eh_frame))${RELOCATING+ *(.eh_frame.*)} }
.sframe ${RELOCATING-0} : ONLY_IF_RW { *(.sframe)${RELOCATING+ *(.sframe.*)} }
.gnu_extab ${RELOCATING-0} : ONLY_IF_RW { *(.gnu_extab) }
.gcc_except_table ${RELOCATING-0} : ONLY_IF_RW { *(.gcc_except_table${RELOCATING+ .gcc_except_table.*}) }
.exception_ranges ${RELOCATING-0} : ONLY_IF_RW { *(.exception_ranges${RELOCATING+*}) }
/* Thread Local Storage sections */
/* Thread Local Storage sections. */
.tdata ${RELOCATING-0} :
{
${RELOCATING+${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__tdata_start"));}}
@@ -709,11 +805,11 @@ cat <<EOF
}
.tbss ${RELOCATING-0} : { *(.tbss${RELOCATING+ .tbss.* .gnu.linkonce.tb.*})${RELOCATING+ *(.tcommon)} }
${RELOCATING+${PREINIT_ARRAY}}
${RELOCATING+${INIT_ARRAY}}
${RELOCATING+${FINI_ARRAY}}
${RELOCATING+$(emit_init_fini_arrays)}
${SMALL_DATA_CTOR-${RELOCATING+${CTOR}}}
${SMALL_DATA_DTOR-${RELOCATING+${DTOR}}}
.jcr ${RELOCATING-0} : { KEEP (*(.jcr)) }
${RELOCATING+${DATARELRO}}
@@ -741,70 +837,165 @@ cat <<EOF
*(.data${RELOCATING+ .data.* .gnu.linkonce.d.*})
${CONSTRUCTING+SORT(CONSTRUCTORS)}
}
.data1 ${RELOCATING-0} : { *(.data1) }
${WRITABLE_RODATA+${RODATA}}
${OTHER_READWRITE_SECTIONS}
${SMALL_DATA_CTOR+${RELOCATING+${CTOR}}}
${SMALL_DATA_DTOR+${RELOCATING+${DTOR}}}
${SDATA_GOT+${DATA_PLT+${PLT_BEFORE_GOT+${PLT}}}}
${SDATA_GOT+${RELOCATING+${OTHER_GOT_SYMBOLS+. = .; ${OTHER_GOT_SYMBOLS}}}}
${SDATA_GOT+${GOT}}
${SDATA_GOT+${OTHER_GOT_SECTIONS}}
${DATA_SDATA-${SDATA}}
${DATA_SDATA-${OTHER_SDATA_SECTIONS}}
${RELOCATING+${SYMBOL_ABI_ALIGNMENT+. = ALIGN(${SYMBOL_ABI_ALIGNMENT});}}
${RELOCATING+${DATA_END_SYMBOLS-${CREATE_SHLIB+PROVIDE (}$(def_symbol "_edata")${CREATE_SHLIB+)}; PROVIDE ($(def_symbol "edata"));}}
${PERSISTENT}
${RELOCATING+${DATA_END_SYMBOLS-${CREATE_SHLIB+PROVIDE (}$(def_symbol "_edata")${CREATE_SHLIB+)};
PROVIDE ($(def_symbol "edata"));}}
$(emit_persistent)
${RELOCATING+. = ALIGN(ALIGNOF(NEXT_SECTION));}
${RELOCATING+${CREATE_SHLIB+PROVIDE (}$(def_symbol "__bss_start")${CREATE_SHLIB+)};}
${RELOCATING+${OTHER_BSS_SYMBOLS}}
${DATA_SDATA-${SBSS}}
${BSS_PLT+${PLT}}
.${BSS_NAME} ${RELOCATING-0} :
{
${RELOCATING+*(.dynbss)}
*(.${BSS_NAME}${RELOCATING+ .${BSS_NAME}.* .gnu.linkonce.b.*})
${RELOCATING+*(COMMON)
/* Align here to ensure that the .bss section occupies space up to
_end. Align after .bss to ensure correct alignment even if the
.bss section disappears because there are no input sections.
FIXME: Why do we need it? When there is no .bss section, we do not
pad the .data section. */
. = ALIGN(. != 0 ? ${ALIGNMENT} : 1);}
${RELOCATING+*(.dynbss)}
*(.${BSS_NAME}${RELOCATING+ .${BSS_NAME}.* .gnu.linkonce.b.*})
${RELOCATING+*(COMMON)}
/* Align here to ensure that in the common case of there only being one
type of .bss section, the section occupies space up to _end.
Align after .bss to ensure correct alignment even if the
.bss section disappears because there are no input sections.
FIXME: Why do we need it? When there is no .bss section, we do not
pad the .data section. */
$(align_to_default_section_alignment)
}
${OTHER_BSS_SECTIONS}
${LARGE_BSS_AFTER_BSS+${LARGE_BSS}}
$(emit_large_bss 0)
${RELOCATING+${OTHER_BSS_END_SYMBOLS}}
${NOINIT}
${RELOCATING+. = ALIGN(${ALIGNMENT});}
$(emit_noinit)
$(align_to_default_symbol_alignment)
EOF
}
align_large_data()
{
LARGE_DATA_ADDR=". = SEGMENT_START(\"ldata-segment\", ${LARGE_DATA_ADDR-.});"
SHLIB_LARGE_DATA_ADDR=". = SEGMENT_START(\"ldata-segment\", ${SHLIB_LARGE_DATA_ADDR-.});"
cat <<EOF
/* Start of the Large Data region. */
${RELOCATING+${CREATE_SHLIB-${CREATE_PIE-${LARGE_DATA_ADDR}}}}
${CREATE_SHLIB+${SHLIB_LARGE_DATA_ADDR}}
${CREATE_PIE+${SHLIB_LARGE_DATA_ADDR}}
EOF
}
emit_large_bss()
{
if test "${LARGE_SECTIONS}" != "yes"; then
return
fi
if test "$1" == "0"; then
if test -n "${LARGE_BSS_AFTER_BSS}"; then
return
fi
else
if test -z "${LARGE_BSS_AFTER_BSS}"; then
return
fi
fi
cat <<EOF
.lbss ${RELOCATING-0} :
{
${RELOCATING+*(.dynlbss)}
*(.lbss${RELOCATING+ .lbss.* .gnu.linkonce.lb.*})
${RELOCATING+*(LARGE_COMMON)}
}
EOF
}
emit_large_data()
{
LARGE_DATA_ADDR=". = SEGMENT_START(\"ldata-segment\", ${LARGE_DATA_ADDR-.});"
SHLIB_LARGE_DATA_ADDR=". = SEGMENT_START(\"ldata-segment\", ${SHLIB_LARGE_DATA_ADDR-.});"
if test "${LARGE_SECTIONS}" != "yes"; then
return
fi
cat <<EOF
.lrodata ${RELOCATING-0} ${RELOCATING+ALIGN(${MAXPAGESIZE}) + (. & (${MAXPAGESIZE} - 1))} :
{
*(.lrodata${RELOCATING+ .lrodata.* .gnu.linkonce.lr.*})
}
.ldata ${RELOCATING-0} ${RELOCATING+ALIGN(${MAXPAGESIZE}) + (. & (${MAXPAGESIZE} - 1))} :
{
*(.ldata${RELOCATING+ .ldata.* .gnu.linkonce.l.*})
$(align_to_default_section_alignment)
}
$(emit_large_bss 1)
EOF
}
emit_end_symbols()
{
cat <<EOF
${RELOCATING+${CREATE_SHLIB-${CREATE_PIE-${LARGE_DATA_ADDR}}}}
${CREATE_SHLIB+${SHLIB_LARGE_DATA_ADDR}}
${CREATE_PIE+${SHLIB_LARGE_DATA_ADDR}}
${LARGE_SECTIONS}
${LARGE_BSS_AFTER_BSS-${LARGE_BSS}}
${RELOCATING+. = ALIGN(${ALIGNMENT});}
${RELOCATING+${OTHER_END_SYMBOLS}}
${RELOCATING+${END_SYMBOLS-${CREATE_SHLIB+PROVIDE (}$(def_symbol "_end")${CREATE_SHLIB+)}; PROVIDE ($(def_symbol "end"));}}
${RELOCATING+${END_SYMBOLS-${CREATE_SHLIB+PROVIDE (}$(def_symbol "_end")${CREATE_SHLIB+)};
PROVIDE ($(def_symbol "end"));}}
${RELOCATING+${DATA_SEGMENT_END}}
EOF
}
emit_tiny_data()
{
cat <<EOF
/* Start of the Tiny Data region. */
${TINY_DATA_SECTION}
${TINY_BSS_SECTION}
${STACK_ADDR+${STACK}}
EOF
}
emit_stack()
{
if test -z "${STACK_ADDR}"; then
return
fi
cat <<EOF
/* Stack. */
.stack ${RELOCATING-0}${RELOCATING+${STACK_ADDR}} :
{
${RELOCATING+$(def_symbol "_stack");}
*(.stack)
${RELOCATING+${STACK_SENTINEL}}
}
EOF
}
emit_misc()
{
source_sh $srcdir/scripttempl/misc-sections.sc
source_sh $srcdir/scripttempl/DWARF.sc
source_sh $srcdir/scripttempl/misc-sections.sc
source_sh $srcdir/scripttempl/DWARF.sc
cat <<EOF
${ATTRS_SECTIONS}
@@ -826,8 +1017,17 @@ EOF
emit_executable_start
#------Early Read Only Data -----------------------------------------------
if test -z "${ALL_TEXT_BEFORE_RO}"; then
# We are allowed to put R/O sections before code sections.
# Doing so either puts read only data into the code segment, if the data
# and code sections are contiguous, or creates a data segment followed by
# a code segment, followed by another data segment (for read/write data).
# Having three segments like this makes the binary bigger, which is a
# problem for some scenarios, eg containers. On the other hand, having
# data in an executable code segment means that it might provide an
# avenue of attack for bad actors, which is a security risk.
test -n "${SEPARATE_CODE}" || emit_early_ro
test -n "${NON_ALLOC_DYN}${SEPARATE_CODE}" || emit_dyn
@@ -840,32 +1040,62 @@ EOF
fi
fi
# We do not align the code segment here as doing so will increase the file size.
# Normally having the text segment at the start of the file will automatically
# mean that it is aligned(*), and if we have emitted any r/o sections due to the
# tests of SEPARATE_CODE above, then extra alignment will have already been
# generated.
#
# *: Including the ELF headers and .note.gnu.build-id section in the code segment
# is a very small theoretical risk.
#------Executable Code ----------------------------------------------------
# We do not invoke "align_text" here as doing so will increase the file
# size. Normally having the text segment at the start of the file will
# automatically mean that it is aligned and if we have emitted any R/O
# sections due to the code above, then extra alignment will have already
# been generated.
emit_text
emit_text_end_symbols
# FIXME: We emit the text segment alignment operations again here.
# (If they are defined). It is not clear why we do this.
align_text
#------Read Only Data -----------------------------------------------------
align_rodata
# If we have not already emitted the early read only data sections then do
# so now. Also if the dynamic section has not already been emitted and we
# can put it into the data segment, then do that here as well.
if test -n "${ALL_TEXT_BEFORE_RO}"; then
test -n "${SEPARATE_CODE}" || emit_early_ro
test -n "${NON_ALLOC_DYN}${SEPARATE_CODE}" || emit_dyn
fi
test -z "${SEPARATE_CODE}" || emit_early_ro
test -z "${SEPARATE_CODE}" || emit_dyn
# Now emit the rest of the read only data.
emit_rodata
#------Read Write Data ----------------------------------------------------
align_data
emit_data
align_large_data
emit_large_data
align_to_default_symbol_alignment
emit_end_symbols
# FIXME: Should the tiny data sections appear before the end symbols ?
emit_tiny_data
#------Miscellaneous ------------------------------------------------------
emit_stack
test -z "${NON_ALLOC_DYN}" || emit_dyn
emit_misc
cat <<EOF