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Tamar Christina b4e87f2c1e Arm: Fix performance issue with thumb-2 tailcalls 
We currently use a padding NOP after a Thumb to Arm interworking veneer (BX pc).
The NOP is never executed but may result in a performance penalty on some cores.

For this reason this patch changes the NOPs after Thumb to Arm veneers into B .-2
and adds a note to this in the source code for future reference.

bfd/ChangeLog:

	* elf32-arm.c (elf32_thumb2_plt_entry, elf32_arm_plt_thumb_stub,
	elf32_arm_stub_long_branch_v4t_thumb_thumb,
	elf32_arm_stub_long_branch_v4t_thumb_arm,
	elf32_arm_stub_short_branch_v4t_thumb_arm,
	elf32_arm_stub_long_branch_v4t_thumb_arm_pic,
	elf32_arm_stub_long_branch_v4t_thumb_thumb_pic,
	elf32_arm_stub_long_branch_v4t_thumb_tls_pic): Change nop to branch to
	previous instruction.

ld/ChangeLog:

	* testsuite/ld-arm/cortex-a8-fix-b-plt.d: Update Testcase.
	* testsuite/ld-arm/cortex-a8-fix-b-rel-arm.d: Likewise.
	* testsuite/ld-arm/cortex-a8-fix-bcc-plt.d: Likewise.
	* testsuite/ld-arm/farcall-cond-thumb-arm.d: Likewise.
	* testsuite/ld-arm/farcall-mixed-app.d: Likewise.
	* testsuite/ld-arm/farcall-mixed-app2.d: Likewise.
	* testsuite/ld-arm/farcall-mixed-lib-v4t.d: Likewise.
	* testsuite/ld-arm/farcall-thumb-arm-pic-veneer.d: Likewise.
	* testsuite/ld-arm/farcall-thumb-arm-short.d: Likewise.
	* testsuite/ld-arm/farcall-thumb-arm.d: Likewise.
	* testsuite/ld-arm/farcall-thumb-thumb-pic-veneer.d: Likewise.
	* testsuite/ld-arm/farcall-thumb-thumb.d: Likewise.
	* testsuite/ld-arm/fix-arm1176-on.d: Likewise.
	* testsuite/ld-arm/ifunc-10.dd: Likewise.
	* testsuite/ld-arm/ifunc-2.dd: Likewise.
	* testsuite/ld-arm/ifunc-4.dd: Likewise.
	* testsuite/ld-arm/ifunc-6.dd: Likewise.
	* testsuite/ld-arm/ifunc-8.dd: Likewise.
	* testsuite/ld-arm/jump-reloc-veneers-long.d: Likewise.
	* testsuite/ld-arm/mixed-app.d: Likewise.
	* testsuite/ld-arm/thumb2-b-interwork.d: Likewise.
	* testsuite/ld-arm/tls-longplt.d: Likewise.
	* testsuite/ld-arm/tls-thumb1.d: Likewise.
2019-08-20 16:35:28 +01:00
..
config
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-aarch64
Change the output of readelf's note display so that the "Data size" column header is left justified.
2019-08-08 17:04:31 +01:00
ld-alpha
Fix alpha testsuite regression
2019-06-14 10:23:20 +09:30
ld-arc
[ARC] Add linker relaxation.
2019-07-24 16:33:29 +03:00
ld-arm
Arm: Fix performance issue with thumb-2 tailcalls
2019-08-20 16:35:28 +01:00
ld-auto-import
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-avr
Fix PR 24571 - Relaxation does not shorten jmp or call to target at pc-relative range boundary
2019-05-21 12:48:06 +05:30
ld-bootstrap
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-bpf
ld: use a specific linker script in BPF targets
2019-08-07 13:57:30 +02:00
ld-cdtest
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-checks
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-cris
Dynamic TLS section symbols
2019-07-13 09:57:50 +09:30
ld-crx
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-csky
Add support for the C_SKY series of processors.
2018-07-30 12:24:14 +01:00
ld-cygwin
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-d10v
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-discard
Support tcl procedure calls in run_dump_test xfail
2019-05-30 00:52:08 +09:30
ld-elf
Add support for a MIPS specific .MIPS.xhash section.
2019-08-09 11:06:37 +01:00
ld-elfcomm
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-elfvers
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-elfvsb
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-elfweak
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-fastcall
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-frv
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-gc
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-h8300
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-i386
Change the output of readelf's note display so that the "Data size" column header is left justified.
2019-08-08 17:04:31 +01:00
ld-ia64
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-ifunc
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-libs
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-linkonce
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-m68hc11
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-m68k
run_dump_test source in build directory
2019-01-08 18:50:54 +10:30
ld-mep
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-metag
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-mips-elf
Add support for a MIPS specific .MIPS.xhash section.
2019-08-09 11:06:37 +01:00
ld-misc
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-mmix
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-mn10300
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-msp430-elf
MSP430 Linker: Define __crt0_init_bss/__crt0_movedata symbols when .lower or .either prefixed sections are present.
2019-04-17 15:05:08 +01:00
ld-nds32
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-nios2
Run more ld tests when not native
2017-01-02 23:48:08 +10:30
ld-or1k
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-pe
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-pie
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-plugin
Ajdust lto-3r and lto-5r tests for powerpc64
2019-07-26 10:02:34 +09:30
ld-powerpc
PowerPC tlsie test fix
2019-08-02 12:41:05 +09:30
ld-pru
Fix binary compatibility between GCC and the TI compiler for the PRU target.
2018-05-09 11:39:32 +01:00
ld-riscv-elf
RISC-V: Fix lui relaxation issue with code at address 0.
2019-08-15 12:01:13 -07:00
ld-s12z
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-s390
Dynamic TLS section symbols
2019-07-13 09:57:50 +09:30
ld-scripts
Move ld-scripts size tests
2019-07-23 18:22:01 +09:30
ld-selective
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-sh
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-shared
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-size
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-sparc
Dynamic TLS section symbols
2019-07-13 09:57:50 +09:30
ld-spu
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-srec
ld: use a specific linker script in BPF targets
2019-08-07 13:57:30 +02:00
ld-tic6x
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-tilegx
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-tilepro
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-undefined
ld: use a specific linker script in BPF targets
2019-08-07 13:57:30 +02:00
ld-unique
Use better test for usable compiler in ld testsuite.
2019-04-24 12:14:56 -07:00
ld-v850
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-vax-elf
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-visium
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-vxworks
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-x86-64
x86-64: Move PIC check for PC-relative relocations back
2019-08-16 14:25:58 -07:00
ld-xc16x
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-xstormy16
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
ld-xtensa
bfd: xtensa: fix shrink_dynamic_reloc_sections for export-dynamic
2019-03-29 10:02:10 -07:00
ld-z8k
Update year range in copyright notice of binutils files
2019-01-01 22:06:53 +10:30
lib
s12z genelf.em
2019-05-30 01:01:42 +09:30
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