diff options
| author | Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> | 2019-11-08 19:20:22 +0300 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2019-11-08 16:14:32 -0800 |
| commit | f091d5a426447cc427680bdd3adc7773aa2867df (patch) | |
| tree | e255dd3806463334c58d03aff06dee6e3b3268c3 /arch/arc/Kconfig | |
| parent | 2f4ecf68a048de44d72157d637bf9cbbbdb357b0 (diff) | |
ARC: ARCv2: jump label: implement jump label patching
Implement jump label patching for ARC. Jump labels provide
an interface to generate dynamic branches using
self-modifying code.
This allows us to implement conditional branches where
changing branch direction is expensive but branch selection
is basically 'free'
This implementation uses 32-bit NOP and BRANCH instructions
which forced to be aligned by 4 to guarantee that they don't
cross L1 cache line boundary and can be update atomically.
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/Kconfig')
| -rw-r--r-- | arch/arc/Kconfig | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 8383155c8c82..375f9d278139 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -46,6 +46,7 @@ config ARC select OF_EARLY_FLATTREE select PCI_SYSCALL if PCI select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING + select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32 config ARCH_HAS_CACHE_LINE_SIZE def_bool y @@ -525,6 +526,13 @@ config ARC_DW2_UNWIND config ARC_DBG_TLB_PARANOIA bool "Paranoia Checks in Low Level TLB Handlers" +config ARC_DBG_JUMP_LABEL + bool "Paranoid checks in Static Keys (jump labels) code" + depends on JUMP_LABEL + default y if STATIC_KEYS_SELFTEST + help + Enable paranoid checks and self-test of both ARC-specific and generic + part of static keys (jump labels) related code. endif config ARC_BUILTIN_DTB_NAME |