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Align linkerscript symbols according to ABI

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Apply ABI specific alignment to symbols generated in the default
linker script.
This commit is contained in:
Andreas Krebbel
2023-07-04 14:13:34 +02:00
parent 1f2218d699
commit a5042543d8
3 changed files with 33 additions and 19 deletions
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1
ld/emulparams/elf64_s390.sh
View File

@@ -17,6 +17,7 @@ EXTRA_EM_FILE=s390
IREL_IN_PLT=
SEPARATE_GOTPLT=0
test -z "$RELRO" && unset SEPARATE_GOTPLT
SYMBOL_ABI_ALIGNMENT=2
# Treat a host that matches the target with the possible exception of "x"
# in the name as if it were native.

1
ld/emulparams/elf_s390.sh
View File

@@ -12,3 +12,4 @@ GENERATE_SHLIB_SCRIPT=yes
GENERATE_PIE_SCRIPT=yes
NO_SMALL_DATA=yes
IREL_IN_PLT=
SYMBOL_ABI_ALIGNMENT=2

50
ld/scripttempl/elf.sc
View File

@@ -78,6 +78,8 @@
# USER_LABEL_PREFIX - prefix to add to user-visible symbols.
# RODATA_NAME, SDATA_NAME, SBSS_NAME, BSS_NAME - base parts of names
# for standard sections, without initial "." or suffixes.
# SYMBOL_ABI_ALIGNMENT - minimum alignment in bytes which needs to be
# applied to every symbol definition
#
# When adding sections, do note that the names of some sections are used
# when specifying the start address of the next.
@@ -165,19 +167,29 @@ if test -z "$GOT"; then
GOTPLT=".got.plt ${RELOCATING-0} : { *(.got.plt)${RELOCATING+ *(.igot.plt)} }"
fi
fi
def_symbol()
{
if [ -z "${SYMBOL_ABI_ALIGNMENT}" ]; then
echo "${USER_LABEL_PREFIX}$1 = . "
else
echo "${USER_LABEL_PREFIX}$1 = ALIGN(${SYMBOL_ABI_ALIGNMENT})"
fi
}
REL_IFUNC=".rel.ifunc ${RELOCATING-0} : { *(.rel.ifunc) }"
RELA_IFUNC=".rela.ifunc ${RELOCATING-0} : { *(.rela.ifunc) }"
REL_IPLT=".rel.iplt ${RELOCATING-0} :
{
${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__rel_iplt_start = .);}}
${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN ($(def_symbol "__rel_iplt_start"));}}
*(.rel.iplt)
${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__rel_iplt_end = .);}}
${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN ($(def_symbol "__rel_iplt_end"));}}
}"
RELA_IPLT=".rela.iplt ${RELOCATING-0} :
{
${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__rela_iplt_start = .);}}
${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN ($(def_symbol "__rela_iplt_start"));}}
*(.rela.iplt)
${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__rela_iplt_end = .);}}
${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN ($(def_symbol "__rela_iplt_end"));}}
}"
DYNAMIC=".dynamic ${RELOCATING-0} : { *(.dynamic) }"
RODATA=".${RODATA_NAME} ${RELOCATING-0} : { *(.${RODATA_NAME}${RELOCATING+ .${RODATA_NAME}.* .gnu.linkonce.r.*}) }"
@@ -267,23 +279,23 @@ else
fi
PREINIT_ARRAY=".preinit_array :
{
${CREATE_SHLIB-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__preinit_array_start = .);}
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__preinit_array_start"));}
KEEP (*(.preinit_array))
${CREATE_SHLIB-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__preinit_array_end = .);}
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__preinit_array_end"));}
}"
INIT_ARRAY=".init_array :
{
${CREATE_SHLIB-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__init_array_start = .);}
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__init_array_start"));}
${SORT_INIT_ARRAY}
KEEP (*(.init_array ${CTORS_IN_INIT_ARRAY}))
${CREATE_SHLIB-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__init_array_end = .);}
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__init_array_end"));}
}"
FINI_ARRAY=".fini_array :
{
${CREATE_SHLIB-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__fini_array_start = .);}
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__fini_array_start"));}
${SORT_FINI_ARRAY}
KEEP (*(.fini_array ${DTORS_IN_FINI_ARRAY}))
${CREATE_SHLIB-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__fini_array_end = .);}
${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__fini_array_end"));}
}"
CTOR=".ctors ${CONSTRUCTING-0} :
{
@@ -323,7 +335,7 @@ DTOR=".dtors ${CONSTRUCTING-0} :
}"
STACK=".stack ${RELOCATING-0}${RELOCATING+${STACK_ADDR}} :
{
${RELOCATING+${USER_LABEL_PREFIX}_stack = .;}
${RELOCATING+$(def_symbol "_stack");}
*(.stack)
${RELOCATING+${STACK_SENTINEL}}
}"
@@ -494,16 +506,16 @@ cat >> ldscripts/dyntmp.$$ <<EOF
.rel.plt ${RELOCATING-0} :
{
*(.rel.plt)
${IREL_IN_PLT+${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__rel_iplt_start = .);}}}
${IREL_IN_PLT+${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN ($(def_symbol "__rel_iplt_start"));}}}
${IREL_IN_PLT+${RELOCATING+*(.rel.iplt)}}
${IREL_IN_PLT+${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__rel_iplt_end = .);}}}
${IREL_IN_PLT+${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN ($(def_symbol "__rel_iplt_end"));}}}
}
.rela.plt ${RELOCATING-0} :
{
*(.rela.plt)
${IREL_IN_PLT+${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__rela_iplt_start = .);}}}
${IREL_IN_PLT+${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN ($(def_symbol "__rela_iplt_start"));}}}
${IREL_IN_PLT+${RELOCATING+*(.rela.iplt)}}
${IREL_IN_PLT+${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__rela_iplt_end = .);}}}
${IREL_IN_PLT+${RELOCATING+${CREATE_PIC-PROVIDE_HIDDEN ($(def_symbol "__rela_iplt_end"));}}}
}
${OTHER_PLT_RELOC_SECTIONS}
EOF
@@ -628,7 +640,7 @@ cat <<EOF
/* Thread Local Storage sections */
.tdata ${RELOCATING-0} :
{
${RELOCATING+${CREATE_SHLIB-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__tdata_start = .);}}
${RELOCATING+${CREATE_SHLIB-PROVIDE_HIDDEN ($(def_symbol "__tdata_start"));}}
*(.tdata${RELOCATING+ .tdata.* .gnu.linkonce.td.*})
}
.tbss ${RELOCATING-0} : { *(.tbss${RELOCATING+ .tbss.* .gnu.linkonce.tb.*})${RELOCATING+ *(.tcommon)} }
@@ -676,10 +688,10 @@ cat <<EOF
${SDATA_GOT+${OTHER_GOT_SECTIONS}}
${DATA_SDATA-${SDATA}}
${DATA_SDATA-${OTHER_SDATA_SECTIONS}}
${RELOCATING+${DATA_END_SYMBOLS-${CREATE_SHLIB+PROVIDE (}${USER_LABEL_PREFIX}_edata = .${CREATE_SHLIB+)}; PROVIDE (${USER_LABEL_PREFIX}edata = .);}}
${RELOCATING+${DATA_END_SYMBOLS-${CREATE_SHLIB+PROVIDE (}$(def_symbol "_edata")${CREATE_SHLIB+)}; PROVIDE ($(def_symbol "edata"));}}
${PERSISTENT}
${RELOCATING+. = .;}
${RELOCATING+${CREATE_SHLIB+PROVIDE (}${USER_LABEL_PREFIX}__bss_start = .${CREATE_SHLIB+)};}
${RELOCATING+${CREATE_SHLIB+PROVIDE (}$(def_symbol "__bss_start")${CREATE_SHLIB+)};}
${RELOCATING+${OTHER_BSS_SYMBOLS}}
${DATA_SDATA-${SBSS}}
${BSS_PLT+${PLT}}
@@ -713,7 +725,7 @@ cat <<EOF
${LARGE_BSS_AFTER_BSS-${LARGE_BSS}}
${RELOCATING+. = ALIGN(${ALIGNMENT});}
${RELOCATING+${OTHER_END_SYMBOLS}}
${RELOCATING+${END_SYMBOLS-${CREATE_SHLIB+PROVIDE (}${USER_LABEL_PREFIX}_end = .${CREATE_SHLIB+)}; PROVIDE (${USER_LABEL_PREFIX}end = .);}}
${RELOCATING+${END_SYMBOLS-${CREATE_SHLIB+PROVIDE (}$(def_symbol "_end")${CREATE_SHLIB+)}; PROVIDE ($(def_symbol "end"));}}
${RELOCATING+${DATA_SEGMENT_END}}
${TINY_DATA_SECTION}
${TINY_BSS_SECTION}