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| author | Giacomo Travaglini <giacomo.travaglini@arm.com> | 2018-05-09 17:52:37 +0100 |
|---|---|---|
| committer | Giacomo Travaglini <giacomo.travaglini@arm.com> | 2018-05-29 10:17:47 +0000 |
| commit | f94f70237dfaac86c83dfbb7cb24e6a821b867eb (patch) | |
| tree | 31fd902bb76d6024e1eac46d301de40fb9db6ec9 /src/arch/arm/ArmISA.py | |
| parent | 936b584ce35c079db98ab17c6ac9c6943ce7220e (diff) | |
| download | gem5-f94f70237dfaac86c83dfbb7cb24e6a821b867eb.tar.xz | |
arch-arm: ISA param for treating MISCREG_IMPDEF_UNIMPL as NOP
In the Arm ISA there are some sys reg numbers which are reserved for
implementation defined registers. The default behaviour is to to treat
them as unimplemented registers. It is now possible to change this
behaviour at runtime and treat them as NOP. In this way an access to
those register won't make simulation fail.
Change-Id: I0d108299a6d5aa81fcdabdaef04eafe46df92343
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/10504
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Diffstat (limited to 'src/arch/arm/ArmISA.py')
| -rw-r--r-- | src/arch/arm/ArmISA.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/arch/arm/ArmISA.py b/src/arch/arm/ArmISA.py index 7956570bd..78dd04330 100644 --- a/src/arch/arm/ArmISA.py +++ b/src/arch/arm/ArmISA.py @@ -1,4 +1,4 @@ -# Copyright (c) 2012-2013, 2015-2016 ARM Limited +# Copyright (c) 2012-2013, 2015-2016, 2018 ARM Limited # All rights reserved. # # The license below extends only to copyright in the software and shall @@ -111,3 +111,9 @@ class ArmISA(SimObject): # Reserved for future expansion id_aa64mmfr1_el1 = Param.UInt64(0x0000000000000000, "AArch64 Memory Model Feature Register 1") + + # Any access (read/write) to an unimplemented + # Implementation Defined registers is not causing an Undefined Instruction. + # It is rather executed as a NOP. + impdef_nop = Param.Bool(False, + "Any access to a MISCREG_IMPDEF_UNIMPL register is executed as NOP") |