[PATCH, BINUTULS, AARCH64, 9/9] Add SSBS to MSR/MRS
authorSudakshina Das <sudi.das@arm.com>
Wed, 26 Sep 2018 10:04:32 +0000 (11:04 +0100)
committerRichard Earnshaw <Richard.Earnshaw@arm.com>
Tue, 9 Oct 2018 14:39:29 +0000 (15:39 +0100)
commit104fefeebb544b7745bb353b63110afa46119647
tree64540070841260d12abe4b232e89eb208ac77869
parenta97330e723cf3c639a951329ac5fe2797528249b
[PATCH, BINUTULS, AARCH64, 9/9] Add SSBS to MSR/MRS

This patch is part of the patch series to add support for ARMv8.5-A
extensions.
(https://developer.arm.com/products/architecture/cpu-architecture/a-profile/exploration-tools)
The encodings can be found in the System Register XML.

This patch adds support for the mitigation for Spectre Variant 4 by
adding the PSTATE bit SSBS which are accessible using MSR and MRS
instructions. Although this is a mandatory addition to the ARMv8.5-A,
it is permitted to be added to any version of the ARMv8 architecture.
This is enabled using the command line option of +ssbs for older
versions.

*** include/ChangeLog ***

2018-10-09  Sudakshina Das  <sudi.das@arm.com>

* opcode/aarch64.h (AARCH64_FEATURE_SSBS): New.
(AARCH64_ARCH_V8_5): Add AARCH64_FEATURE_SSBS by default.

*** opcodes/ChangeLog ***

2018-10-09  Sudakshina Das  <sudi.das@arm.com>

* aarch64-opc.c (operand_general_constraint_met_p): Add
SSBS in the check for one-bit immediate.
(aarch64_sys_regs): New entry for SSBS.
(aarch64_sys_reg_supported_p): New check for above.
(aarch64_pstatefields): New entry for SSBS.
(aarch64_pstatefield_supported_p): New check for above.

*** gas/ChangeLog ***

2018-10-09  Sudakshina Das  <sudi.das@arm.com>

* config/tc-aarch64.c (aarch64_features): Add new "ssbs".
* doc/c-aarch64.texi: Document the same.
* testsuite/gas/aarch64/ssbs-illegal1.d: New test.
* testsuite/gas/aarch64/ssbs-illegal1.l: New test.
* testsuite/gas/aarch64/ssbs-illegal2.d: New test.
* testsuite/gas/aarch64/ssbs-illegal2.l: New test.
* testsuite/gas/aarch64/ssbs.s: New test.
* testsuite/gas/aarch64/ssbs1.d: Test with +ssbs
* testsuite/gas/aarch64/ssbs2.d: Test with armv8.5-a.
14 files changed:
gas/ChangeLog
gas/config/tc-aarch64.c
gas/doc/c-aarch64.texi
gas/testsuite/gas/aarch64/ssbs-illegal1.d [new file with mode: 0644]
gas/testsuite/gas/aarch64/ssbs-illegal1.l [new file with mode: 0644]
gas/testsuite/gas/aarch64/ssbs-illegal2.d [new file with mode: 0644]
gas/testsuite/gas/aarch64/ssbs-illegal2.l [new file with mode: 0644]
gas/testsuite/gas/aarch64/ssbs.s [new file with mode: 0644]
gas/testsuite/gas/aarch64/ssbs1.d [new file with mode: 0644]
gas/testsuite/gas/aarch64/ssbs2.d [new file with mode: 0644]
include/ChangeLog
include/opcode/aarch64.h
opcodes/ChangeLog
opcodes/aarch64-opc.c