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

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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}.
This commit is contained in:
H.J. Lu
2018-01-11 19:01:39 -08:00
parent 6181e9c2c5
commit 47acac12c8
9 changed files with 218 additions and 20 deletions
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5
include/ChangeLog
View File

@@ -1,3 +1,8 @@
2018-01-11 H.J. Lu <hongjiu.lu@intel.com>
PR ld/22393
* bfdlink.h (bfd_link_info): Add separate_code.
2018-01-04 Jim Wilson <jimw@sifive.com>
* opcode/riscv-opc.h (CSR_SBADADDR): Rename to CSR_STVAL. Rename

3
include/bfdlink.h
View File

@@ -386,6 +386,9 @@ struct bfd_link_info
/* TRUE if PT_GNU_RELRO segment should be created. */
unsigned int relro: 1;
/* TRUE if separate code segment should be created. */
unsigned int separate_code: 1;
/* Nonzero if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment
should be created. 1 for DWARF2 tables, 2 for compact tables. */
unsigned int eh_frame_hdr_type: 2;