FreeChainXenon/binutils-gdb
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ELF: Support .noinit and .persistent sections

Browse source 
The ".persistent" section is for data that should be initialized during
load, but not during application reset.

The ".noinit" section is for data that should not be initialized during
load or application reset.

Targets utilizing the elf.sc linker script template can define
HAVE_{NOINIT,PERSISTENT}=yes to include the .noinit or .persistent
output sections in the generated linker script.

Targets with existing support for .noinit did not handle unique
.noinit.* and .gnu.linkonce.n.* sections the .noinit output section,
this patch also fixes that.

bfd/ChangeLog:

	* elf.c (special_sections_g): Add .gnu.linkonce.n and .gnu.linkonce.p.
	(special_sections_n): Add .noinit.
	(special_sections_p): Add .persistent.

binutils/ChangeLog:

	* testsuite/lib/binutils-common.exp (supports_noinit_section): New.
	(supports_persistent_section): New.

gas/ChangeLog:

	* testsuite/gas/elf/elf.exp: Run new tests.
	* testsuite/gas/elf/section25.d: New test.
	* testsuite/gas/elf/section25.s: New test.
	* testsuite/gas/elf/section26.d: New test.
	* testsuite/gas/elf/section26.s: New test.

ld/ChangeLog:

	* emulparams/armelf.sh (OTHER_SECTIONS): Remove .noinit section
	definition.
	Define HAVE_{NOINIT,PERSISTENT}=yes.
	* scripttempl/avr.sc (.noinit): Add .noinit.* and .gnu.linkonce.n.*
	input section wildcard patterns.
	* scripttempl/elf.sc: Define .noinit and .persistent sections when
	HAVE_NOINIT or HAVE_PERSISTENT are defined to "yes".
	* scripttempl/elf32msp430.sc (.noinit): Add .noinit.* and
	.gnu.linkonce.n.*. input section wildcard patterns.
	(.persistent): Add .persistent.* and
	.gnu.linkonce.p.*. input section wildcard patterns.
	* scripttempl/elfarcv2.sc (.noinit): Add .noinit.* and
	.gnu.linkonce.n.*. input section wildcard patterns.
	* scripttempl/pru.sc: Likewise.
	* testsuite/ld-elf/noinit-sections-1.d: New test.
	* testsuite/ld-elf/noinit-sections-2.d: New test.
	* testsuite/ld-elf/noinit-sections-2.l: New test.
	* testsuite/ld-elf/noinit-sections.s: New test.
	* testsuite/ld-elf/persistent-sections-1.d: New test.
	* testsuite/ld-elf/persistent-sections-2.d: New test.
	* testsuite/ld-elf/persistent-sections-2.l: New test.
	* testsuite/ld-elf/persistent-sections.s: New test.
This commit is contained in:
Jozef Lawrynowicz 2020-11-27 10:45:35 +00:00
parent bab6ead85f
commit 2c6f3e56cb
25 changed files with 249 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

4
bfd/elf.c
View file

@ -2705,6 +2705,8 @@ static const struct bfd_elf_special_section special_sections_f[] =
static const struct bfd_elf_special_section special_sections_g[] =
{
{ STRING_COMMA_LEN (".gnu.linkonce.b"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
{ STRING_COMMA_LEN (".gnu.linkonce.n"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
{ STRING_COMMA_LEN (".gnu.linkonce.p"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
{ STRING_COMMA_LEN (".gnu.lto_"), -1, SHT_PROGBITS, SHF_EXCLUDE },
{ STRING_COMMA_LEN (".got"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
{ STRING_COMMA_LEN (".gnu.version"), 0, SHT_GNU_versym, 0 },
@ -2738,6 +2740,7 @@ static const struct bfd_elf_special_section special_sections_l[] =
static const struct bfd_elf_special_section special_sections_n[] =
{
{ STRING_COMMA_LEN (".noinit"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
{ STRING_COMMA_LEN (".note.GNU-stack"), 0, SHT_PROGBITS, 0 },
{ STRING_COMMA_LEN (".note"), -1, SHT_NOTE, 0 },
{ NULL, 0, 0, 0, 0 }
@ -2745,6 +2748,7 @@ static const struct bfd_elf_special_section special_sections_n[] =
static const struct bfd_elf_special_section special_sections_p[] =
{
{ STRING_COMMA_LEN (".persistent"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
{ STRING_COMMA_LEN (".preinit_array"), -2, SHT_PREINIT_ARRAY, SHF_ALLOC + SHF_WRITE },
{ STRING_COMMA_LEN (".plt"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR },
{ NULL, 0, 0, 0, 0 }