ld: Add "-z separate-code" option to ELF linker

The new "-z separate-code" option will generate separate code LOAD
segment which must be in wholly disjoint pages from any other data.

include/

	PR ld/22393
	* bfdlink.h (bfd_link_info): Add separate_code.

ld/

	PR ld/22393
	* NEWS: Mention "-z separate-code".
	* emultempl/elf32.em (gld${EMULATION_NAME}_get_script): Get
	builtin linker scripts and return linker scripts from disk for
	"-z separate-code".
	(gld${EMULATION_NAME}_handle_option): Handle "-z separate-code"
	and "-z noseparate-code".
	* genscripts.sh: Generate linker scripts for "-z separate-code".
	(LD_FLAG): Set to *textonly for "-z separate-code".
	* ld.texinfo: Document "-z separate-code".
	* lexsup.c (elf_shlib_list_options): Add linker help messsages
	for "-z separate-code" and "-z noseparate-code".
	* scripttempl/elf.sc (SEPARATE_TEXT): New
	(TEXT_SEGMENT_ALIGN): Likewise.
	Use ${TEXT_SEGMENT_ALIGN} to align and pad text segment to
	${MAXPAGESIZE}.

1 files changed, 68 insertions, 8 deletions

diff --git a/ld/genscripts.sh b/ld/genscripts.sh
index 43ccf5eda4d..8732422b3a1 100755
--- a/ld/genscripts.sh
+++ b/ld/genscripts.sh
@@ -290,14 +290,20 @@ CONSTRUCTING=" "
   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xu
 
-LD_FLAG=
 DATA_ALIGNMENT=${DATA_ALIGNMENT_}
 RELOCATING=" "
+LD_FLAG=
 ( echo "/* Default linker script, for normal executables */"
   . ${CUSTOMIZER_SCRIPT}
   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.x
 
+LD_FLAG=textonly
+( echo "/* Script for -z separate-code: generate normal executables with separate code segment */"
+  . ${CUSTOMIZER_SCRIPT}
+  . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xe
+
 LD_FLAG=n
 DATA_ALIGNMENT=${DATA_ALIGNMENT_n}
 ( echo "/* Script for -n: mix text and data on same page */"
@@ -321,44 +327,78 @@ if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
   ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xc
   rm -f ${COMBRELOC}
-  LD_FLAG=w
+  LD_FLAG=ctextonly
+  COMBRELOC=ldscripts/${EMULATION_NAME}.xce.tmp
+  ( echo "/* Script for -z combreloc -z separate-code: combine and sort reloc sections with separate code segment */"
+    . ${CUSTOMIZER_SCRIPT}
+    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+  ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xce
+  rm -f ${COMBRELOC}
   RELRO_NOW=" "
+  LD_FLAG=w
   COMBRELOC=ldscripts/${EMULATION_NAME}.xw.tmp
   ( echo "/* Script for -z combreloc -z now -z relro: combine and sort reloc sections */"
     . ${CUSTOMIZER_SCRIPT}
     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
   ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xw
   rm -f ${COMBRELOC}
+  LD_FLAG=wtextonly
+  COMBRELOC=ldscripts/${EMULATION_NAME}.xwe.tmp
+  ( echo "/* Script for -z combreloc -z now -z relro -z separate-code: combine and sort reloc sections with separate code segment */"
+    . ${CUSTOMIZER_SCRIPT}
+    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+  ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xwe
+  rm -f ${COMBRELOC}
   COMBRELOC=
   unset RELRO_NOW
 fi
 
 if test -n "$GENERATE_SHLIB_SCRIPT"; then
-  LD_FLAG=shared
   DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
   CREATE_SHLIB=" "
+  LD_FLAG=shared
   (
     echo "/* Script for ld --shared: link shared library */"
     . ${CUSTOMIZER_SCRIPT}
     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
   ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xs
+  LD_FLAG=sharedtextonly
+  (
+    echo "/* Script for ld --shared -z separate-code: link shared library with separate code segment */"
+    . ${CUSTOMIZER_SCRIPT}
+    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+  ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xse
   if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
-    LD_FLAG=cshared
     DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
+    LD_FLAG=cshared
     COMBRELOC=ldscripts/${EMULATION_NAME}.xsc.tmp
     ( echo "/* Script for --shared -z combreloc: shared library, combine & sort relocs */"
       . ${CUSTOMIZER_SCRIPT}
       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
     ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xsc
     rm -f ${COMBRELOC}
-    LD_FLAG=wshared
+    LD_FLAG=csharedtextonly
+    COMBRELOC=ldscripts/${EMULATION_NAME}.xsce.tmp
+    ( echo "/* Script for --shared -z combreloc -z separate-code: shared library, combine & sort relocs with separate code segment */"
+      . ${CUSTOMIZER_SCRIPT}
+      . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+    ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xsce
+    rm -f ${COMBRELOC}
     RELRO_NOW=" "
+    LD_FLAG=wshared
     COMBRELOC=ldscripts/${EMULATION_NAME}.xsw.tmp
     ( echo "/* Script for --shared -z combreloc -z now -z relro: shared library, combine & sort relocs */"
       . ${CUSTOMIZER_SCRIPT}
       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
     ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xsw
     rm -f ${COMBRELOC}
+    LD_FLAG=wsharedtextonly
+    COMBRELOC=ldscripts/${EMULATION_NAME}.xswe.tmp
+    ( echo "/* Script for --shared -z combreloc -z now -z relro -z separate-code: shared library, combine & sort relocs with separate code segment */"
+      . ${CUSTOMIZER_SCRIPT}
+      . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+    ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xswe
+    rm -f ${COMBRELOC}
     COMBRELOC=
     unset RELRO_NOW
   fi
@@ -366,31 +406,51 @@ if test -n "$GENERATE_SHLIB_SCRIPT"; then
 fi
 
 if test -n "$GENERATE_PIE_SCRIPT"; then
-  LD_FLAG=pie
   DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
   CREATE_PIE=" "
+  LD_FLAG=pie
   (
     echo "/* Script for ld -pie: link position independent executable */"
     . ${CUSTOMIZER_SCRIPT}
     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
   ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xd
+  LD_FLAG=pietextonly
+  (
+    echo "/* Script for ld -pie -z separate-code: link position independent executable with separate code segment */"
+    . ${CUSTOMIZER_SCRIPT}
+    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+  ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xde
   if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
-    LD_FLAG=cpie
     DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
     COMBRELOC=ldscripts/${EMULATION_NAME}.xdc.tmp
+    LD_FLAG=cpie
     ( echo "/* Script for -pie -z combreloc: position independent executable, combine & sort relocs */"
       . ${CUSTOMIZER_SCRIPT}
       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
     ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xdc
     rm -f ${COMBRELOC}
-    LD_FLAG=wpie
+    LD_FLAG=cpietextonly
+    COMBRELOC=ldscripts/${EMULATION_NAME}.xdce.tmp
+    ( echo "/* Script for -pie -z combreloc -z separate-code: position independent executable, combine & sort relocs with separate code segment */"
+      . ${CUSTOMIZER_SCRIPT}
+      . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+    ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xdce
+    rm -f ${COMBRELOC}
     RELRO_NOW=" "
+    LD_FLAG=wpie
     COMBRELOC=ldscripts/${EMULATION_NAME}.xdw.tmp
     ( echo "/* Script for -pie -z combreloc -z now -z relro: position independent executable, combine & sort relocs */"
       . ${CUSTOMIZER_SCRIPT}
       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
     ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xdw
     rm -f ${COMBRELOC}
+    LD_FLAG=wpietextonly
+    COMBRELOC=ldscripts/${EMULATION_NAME}.xdwe.tmp
+    ( echo "/* Script for -pie -z combreloc -z now -z relro -z separate-code: position independent executable, combine & sort relocs with separate code segment */"
+      . ${CUSTOMIZER_SCRIPT}
+      . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
+    ) | sed -e '/^ *$/d;s/[	 ]*$//' > ldscripts/${EMULATION_NAME}.xdwe
+    rm -f ${COMBRELOC}
     COMBRELOC=
     unset RELRO_NOW
   fi