From: Andreas Krebbel <krebbel@linux.ibm.com>
Date: Tue, 4 Jul 2023 12:13:34 +0000 (+0200)
Subject: Align linkerscript symbols according to ABI
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a5042543d819df8a76ebec8c4d715f244efbab0a;p=binutils-gdb.git

Align linkerscript symbols according to ABI

Apply ABI specific alignment to symbols generated in the default
linker script.
---

diff --git a/ld/emulparams/elf64_s390.sh b/ld/emulparams/elf64_s390.sh
index 899efd7f532..d0a2a59a092 100644
--- a/ld/emulparams/elf64_s390.sh
+++ b/ld/emulparams/elf64_s390.sh
@@ -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.
diff --git a/ld/emulparams/elf_s390.sh b/ld/emulparams/elf_s390.sh
index cb1c6b5b04d..1b2fca3f937 100644
--- a/ld/emulparams/elf_s390.sh
+++ b/ld/emulparams/elf_s390.sh
@@ -12,3 +12,4 @@ GENERATE_SHLIB_SCRIPT=yes
 GENERATE_PIE_SCRIPT=yes
 NO_SMALL_DATA=yes
 IREL_IN_PLT=
+SYMBOL_ABI_ALIGNMENT=2
diff --git a/ld/scripttempl/elf.sc b/ld/scripttempl/elf.sc
index 1e3c5aa8504..9e95e6b4162 100644
--- a/ld/scripttempl/elf.sc
+++ b/ld/scripttempl/elf.sc
@@ -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}