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GENERATE_SHLIB_SCRIPT vs. EMBEDDED. 

A target that sets EMBEDDED non-empty is one that doesn't want to put
the ELF file header or program header in a memory image.  Likely the
target isn't interested in supporting dynamically loaded executables,
shared libraries, or PIEs, because loaders for such binaries generally
require program headers to be present.  This isn't 100% true though.
The target might be one where the loader accesses the file system in
order to retrieve headers.

Also, note that not all "shared libraries" require gcc -shared or the
shared library support in the linker.  I believe one implementation of
shared libraries on uclinux is like this.

So, this patch removes GENERATE_SHLIB_SCRIPT and GENERATE_PIE_SCRIPT
in most emulparams files where EMBEDDED is set, restoring the shared
lib and pie support in emulparams files that unset EMBEDDED after
including a file where the support is removed.

Exceptions to the general rule that EMBEDDED disables shared libs are:
  arm*-*-symbianelf*, where the OS wants shared library support
  without ELF program headers in the image, and

  sh*-*-uclinux*, where I've left things as they were, ie. both
  EMBEDDED and GENERATE_SHLIB_SCRIPT because I'm unsure as to the
  shared library scheme.

	* emulparams/aarch64elf.sh (GENERATE_SHLIB_SCRIPT),
	(GENERATE_PIE_SCRIPT): Don't set.
	* emulparams/aarch64elf32.sh (GENERATE_SHLIB_SCRIPT),
	(GENERATE_PIE_SCRIPT): Don't set.
	* emulparams/arcelf.sh (GENERATE_SHLIB_SCRIPT): Don't set.
	* emulparams/armelf.sh (GENERATE_SHLIB_SCRIPT),
	(GENERATE_PIE_SCRIPT): Don't set.
	* emulparams/armelf_fbsd.sh (GENERATE_SHLIB_SCRIPT): Set.
	* emulparams/armelf_nbsd.sh (GENERATE_SHLIB_SCRIPT),
	(GENERATE_PIE_SCRIPT): Set.
	* emulparams/armelf_vxworks.sh (GENERATE_SHLIB_SCRIPT): Set.
	* emulparams/armsymbian.sh (GENERATE_SHLIB_SCRIPT): Set.
	* emulparams/elf32bfin.sh (GENERATE_SHLIB_SCRIPT): Don't set.
	* emulparams/elf32microblaze.sh (GENERATE_SHLIB_SCRIPT): Don't set.
	* emulparams/score3_elf.sh (GENERATE_SHLIB_SCRIPT): Don't set.
	* emulparams/shelf.sh (GENERATE_SHLIB_SCRIPT): Don't set.
	* emulparams/shelf_nbsd.sh (GENERATE_SHLIB_SCRIPT),
	(GENERATE_PIE_SCRIPT): Set.
	* emulparams/shelf_uclinux.sh (GENERATE_SHLIB_SCRIPT): Set.
This commit is contained in:
Alan Modra 2019-11-01 13:45:25 +10:30
parent cbb54a288a
commit f2aaebdb97
15 changed files with 31 additions and 18 deletions
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22
ld/ChangeLog
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@ -1,3 +1,25 @@
2019-11-05 Alan Modra <amodra@gmail.com>
* emulparams/aarch64elf.sh (GENERATE_SHLIB_SCRIPT),
(GENERATE_PIE_SCRIPT): Don't set.
* emulparams/aarch64elf32.sh (GENERATE_SHLIB_SCRIPT),
(GENERATE_PIE_SCRIPT): Don't set.
* emulparams/arcelf.sh (GENERATE_SHLIB_SCRIPT): Don't set.
* emulparams/armelf.sh (GENERATE_SHLIB_SCRIPT),
(GENERATE_PIE_SCRIPT): Don't set.
* emulparams/armelf_fbsd.sh (GENERATE_SHLIB_SCRIPT): Set.
* emulparams/armelf_nbsd.sh (GENERATE_SHLIB_SCRIPT),
(GENERATE_PIE_SCRIPT): Set.
* emulparams/armelf_vxworks.sh (GENERATE_SHLIB_SCRIPT): Set.
* emulparams/armsymbian.sh (GENERATE_SHLIB_SCRIPT): Set.
* emulparams/elf32bfin.sh (GENERATE_SHLIB_SCRIPT): Don't set.
* emulparams/elf32microblaze.sh (GENERATE_SHLIB_SCRIPT): Don't set.
* emulparams/score3_elf.sh (GENERATE_SHLIB_SCRIPT): Don't set.
* emulparams/shelf.sh (GENERATE_SHLIB_SCRIPT): Don't set.
* emulparams/shelf_nbsd.sh (GENERATE_SHLIB_SCRIPT),
(GENERATE_PIE_SCRIPT): Set.
* emulparams/shelf_uclinux.sh (GENERATE_SHLIB_SCRIPT): Set.
2019-11-05 Alan Modra <amodra@gmail.com>
* emulparams/elf32bfinfd.sh: Unset EMBEDDED rather assigning as empty.

3
ld/emulparams/aarch64elf.sh
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@ -12,9 +12,6 @@ NO_REL_RELOCS=yes
TEMPLATE_NAME=elf
EXTRA_EM_FILE=aarch64elf
GENERATE_SHLIB_SCRIPT=yes
GENERATE_PIE_SCRIPT=yes
MAXPAGESIZE="CONSTANT (MAXPAGESIZE)"
ENTRY=_start

3
ld/emulparams/aarch64elf32.sh
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@ -12,9 +12,6 @@ NO_REL_RELOCS=yes
TEMPLATE_NAME=elf
EXTRA_EM_FILE=aarch64elf
GENERATE_SHLIB_SCRIPT=yes
GENERATE_PIE_SCRIPT=yes
MAXPAGESIZE="CONSTANT (MAXPAGESIZE)"
ENTRY=_start

2
ld/emulparams/arcelf.sh
View File

@ -19,5 +19,3 @@ SDATA_START_SYMBOLS='__SDATA_BEGIN__ = . + 0x100;'
JLI_START_TABLE='__JLI_TABLE__ = .;'
OTHER_SECTIONS="/DISCARD/ : { *(.__arc_profile_*) }"
EMBEDDED=yes
GENERATE_SHLIB_SCRIPT=yes

3
ld/emulparams/armelf.sh
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@ -32,9 +32,6 @@ OTHER_READONLY_SECTIONS="
DATA_START_SYMBOLS="${CREATE_SHLIB+PROVIDE (}__data_start = .${CREATE_SHLIB+)};"
GENERATE_SHLIB_SCRIPT=yes
GENERATE_PIE_SCRIPT=yes
ARCH=arm
MACHINE=
MAXPAGESIZE="CONSTANT (MAXPAGESIZE)"

2
ld/emulparams/armelf_fbsd.sh
View File

@ -5,7 +5,7 @@ TEXT_START_ADDR=0x00010000
TARGET2_TYPE=got-rel
MAXPAGESIZE="CONSTANT (MAXPAGESIZE)"
GENERATE_SHLIB_SCRIPT=yes
GENERATE_PIE_SCRIPT=yes
unset STACK_ADDR
unset EMBEDDED

2
ld/emulparams/armelf_nbsd.sh
View File

@ -3,5 +3,7 @@ MAXPAGESIZE="CONSTANT (MAXPAGESIZE)"
TEXT_START_ADDR=0x00008000
TARGET2_TYPE=got-rel
GENERATE_SHLIB_SCRIPT=yes
GENERATE_PIE_SCRIPT=yes
unset STACK_ADDR
unset EMBEDDED

1
ld/emulparams/armelf_vxworks.sh
View File

@ -4,3 +4,4 @@ BIG_OUTPUT_FORMAT="elf32-bigarm-vxworks"
LITTLE_OUTPUT_FORMAT="$OUTPUT_FORMAT"
MAXPAGESIZE="CONSTANT (MAXPAGESIZE)"
source_sh ${srcdir}/emulparams/vxworks.sh
GENERATE_SHLIB_SCRIPT=yes

2
ld/emulparams/armsymbian.sh
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@ -8,6 +8,8 @@ TARGET1_IS_REL=1
TARGET2_TYPE=abs
# On BPABI systems, program headers should not be mapped.
EMBEDDED=yes
# Nonetheless, shared libraries are also supported
GENERATE_SHLIB_SCRIPT=yes
# As for armelf.sh, but add the SymbianOS-specific
# .ARM.exidx$${Base,Limit} symbols.

1
ld/emulparams/elf32bfin.sh
View File

@ -6,7 +6,6 @@ TARGET_PAGE_SIZE=0x1000
ARCH=bfin
MACHINE=
TEMPLATE_NAME=elf
GENERATE_SHLIB_SCRIPT=yes
EMBEDDED=yes
USER_LABEL_PREFIX=_
EXTRA_EM_FILE=bfin

3
ld/emulparams/elf32microblaze.sh
View File

@ -21,6 +21,3 @@ NOP=0x80000000
#OTHER_RELOCATING_SECTIONS='PROVIDE (_stack = _end + 0x1000);'
TEMPLATE_NAME=elf
#GENERATE_SHLIB_SCRIPT=yes

1
ld/emulparams/score3_elf.sh
View File

@ -26,4 +26,3 @@ ARCH=score3
MACHINE=
ENTRY=_start
EMBEDDED=yes
GENERATE_SHLIB_SCRIPT=yes

1
ld/emulparams/shelf.sh
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@ -9,7 +9,6 @@ MAXPAGESIZE=128
ARCH=sh
MACHINE=
TEMPLATE_NAME=elf
GENERATE_SHLIB_SCRIPT=yes
EMBEDDED=yes
# These are for compatibility with the COFF toolchain.
ENTRY=start

2
ld/emulparams/shelf_nbsd.sh
View File

@ -11,5 +11,7 @@ DATA_START_SYMBOLS='PROVIDE (__data_start = .);';
ENTRY=_start
GENERATE_SHLIB_SCRIPT=yes
GENERATE_PIE_SCRIPT=yes
unset EMBEDDED
unset STACK_ADDR

1
ld/emulparams/shelf_uclinux.sh
View File

@ -2,3 +2,4 @@ source_sh ${srcdir}/emulparams/shelf.sh
# We do not want a .stack section
unset STACK_ADDR
GENERATE_SHLIB_SCRIPT=yes