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r267769 - in /trunk/gcc: ChangeLog config.gcc c...
- From: sudi at gcc dot gnu dot org
- To: gcc-cvs at gcc dot gnu dot org
- Date: Wed, 09 Jan 2019 14:21:22 -0000
- Subject: r267769 - in /trunk/gcc: ChangeLog config.gcc c...
Author: sudi
Date: Wed Jan 9 14:21:22 2019
New Revision: 267769
URL: https://gcc.gnu.org/viewcvs?rev=267769&root=gcc&view=rev
Log:
[AArch64, 5/6] Enable BTI : Add new pass for BTI.
This patch is part of a series that enables ARMv8.5-A in GCC and
adds Branch Target Identification Mechanism.
This patch adds a new pass called "bti" which is triggered by the command
line argument -mbranch-protection whenever "bti" is turned on.
The pass iterates through the instructions and adds appropriated BTI
instructions based on the following:
* Add a new "BTI C" at the beginning of a function, unless its already
protected by a "PACIASP". We exempt the functions that are only called
directly.
* Add a new "BTI J" for every target of an indirect jump, jump table
targets, non-local goto targets or labels that might be referenced by
variables, constant pools, etc (NOTE_INSN_DELETED_LABEL).
Since we have already changed the use of indirect tail calls to only x16 and
x17, we do not have to use "BTI JC".
(check patch 3/6).
*** gcc/ChangeLog ***
2018-01-09 Sudakshina Das <sudi.das@arm.com>
Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
* config.gcc (aarch64*-*-*): Add aarch64-bti-insert.o.
* gcc/config/aarch64/aarch64.h: Update comment for TRAMPOLINE_SIZE.
* config/aarch64/aarch64.c (aarch64_asm_trampoline_template): Update
if bti is enabled.
* config/aarch64/aarch64-bti-insert.c: New file.
* config/aarch64/aarch64-passes.def (INSERT_PASS_BEFORE): Insert bti
pass.
* config/aarch64/aarch64-protos.h (make_pass_insert_bti): Declare the
new bti pass.
* config/aarch64/aarch64.md (unspecv): Add UNSPECV_BTI_NOARG,
UNSPECV_BTI_C, UNSPECV_BTI_J and UNSPECV_BTI_JC.
(bti_noarg, bti_j, bti_c, bti_jc): New define_insns.
* config/aarch64/t-aarch64: Add rule for aarch64-bti-insert.o.
*** gcc/testsuite/ChangeLog ***
2018-01-09 Sudakshina Das <sudi.das@arm.com>
* gcc.target/aarch64/bti-1.c: New test.
* gcc.target/aarch64/bti-2.c: New test.
* gcc.target/aarch64/bti-3.c: New test.
* lib/target-supports.exp
(check_effective_target_aarch64_bti_hw): Add new check for BTI hw.
Added:
trunk/gcc/config/aarch64/aarch64-bti-insert.c
trunk/gcc/testsuite/gcc.target/aarch64/bti-1.c
trunk/gcc/testsuite/gcc.target/aarch64/bti-2.c
trunk/gcc/testsuite/gcc.target/aarch64/bti-3.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config.gcc
trunk/gcc/config/aarch64/aarch64-passes.def
trunk/gcc/config/aarch64/aarch64-protos.h
trunk/gcc/config/aarch64/aarch64.c
trunk/gcc/config/aarch64/aarch64.h
trunk/gcc/config/aarch64/aarch64.md
trunk/gcc/config/aarch64/t-aarch64
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/lib/target-supports.exp