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| author | Sudakshina Das <sudi.das@arm.com> | 2018-09-26 11:04:32 +0100 |
|---|---|---|
| committer | Richard Earnshaw <Richard.Earnshaw@arm.com> | 2018-10-09 15:39:29 +0100 |
| commit | 104fefeebb544b7745bb353b63110afa46119647 (patch) | |
| tree | 64540070841260d12abe4b232e89eb208ac77869 /gas/doc | |
| parent | a97330e723cf3c639a951329ac5fe2797528249b (diff) | |
| download | gdb-104fefeebb544b7745bb353b63110afa46119647.zip gdb-104fefeebb544b7745bb353b63110afa46119647.tar.gz gdb-104fefeebb544b7745bb353b63110afa46119647.tar.bz2 | |
[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.
Diffstat (limited to 'gas/doc')
| -rw-r--r-- | gas/doc/c-aarch64.texi | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/gas/doc/c-aarch64.texi b/gas/doc/c-aarch64.texi index 009a379..4941c57 100644 --- a/gas/doc/c-aarch64.texi +++ b/gas/doc/c-aarch64.texi @@ -187,6 +187,8 @@ automatically cause those extensions to be disabled. @tab Enable the Execution and Data and Prediction instructions. @item @code{rng} @tab ARMv8.5-A @tab No @tab Enable ARMv8.5-A random number instructions. +@item @code{ssbs} @tab ARMv8-A @tab ARMv8.5-A or later + @tab Enable Speculative Store Bypassing Safe state read and write. @end multitable @node AArch64 Syntax |