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2018-04-19arch-arm: Fix Unknown Instruction disassembleGiacomo Travaglini
Do not print the entire ExtMachInst when disassembling an Unknown Instruction. Change-Id: Icd5908ec0fa430090165b2426372bdeb43c2a155 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/10062 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2018-04-06arch-arm: Fix AArch32 branch instructions disassembleGiacomo Travaglini
This patch adds the generateDisassembly method for BranchReg, BranchImm and BranchRegReg Base classes used by AArch32 branch instructions. Change-Id: I6de015cc213335556d5187df3d4fcd765876262c Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/9503 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2018-04-06arch-arm: Correct mcrr,mrrc disassembleGiacomo Travaglini
This patch is fixing AArch32 mcrr,mrrc instruction disassemble by printing the correct source/destination registers Change-Id: I3fcffa0349aeee466e7c60ba4d1244824fb65d91 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/9501 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2018-03-26arch: Fix all override related warnings.Gabe Black
Clang has started(?) reporting override related warnings, something gcc apparently did before, but was disabled in the SConstruct. Rather than disable the warnings in for clang as well, this change fixes the warnings. A future change will re-enable the warnings for gcc. Change-Id: I3cc79e45749b2ae0f9bebb1acadc56a3d3a942da Reviewed-on: https://gem5-review.googlesource.com/9343 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Gabe Black <gabeblack@google.com>
2018-03-26arch: Add a virtual asBytes function to the StaticInst class.Gabe Black
This function takes a pointer to a buffer and the current size of the buffer as a pass by reference argument. If the size of the buffer is sufficient, the function stores a binary representation of itself (generally the ISA defined instruction encoding) in the buffer, and sets the size argument to how much space it used. This could be used by ISAs which have two instruction sizes (ARM and thumb, for example). If the buffer size isn't sufficient, then the size parameter should be set to what size is required, and then the function should return without modifying the buffer. The buffer itself should be aligned to the same standard as memory returned by new, specifically "The pointer returned shall be suitably aligned so that it can be converted to a pointer of any complete object type and then used to access the object or array in the storage allocated...". This will avoid having to memcpy buffers to avoid unaligned accesses. To standardize the representation of the data, it should be stored in the buffer as little endian. Since most hosts (including ARM and x86 hosts) will be little endian, this will almost always be a no-op. Change-Id: I2f31aa0b4f9c0126b44f47a881c2901243279bd6 Reviewed-on: https://gem5-review.googlesource.com/7562 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Gabe Black <gabeblack@google.com>
2018-03-15arm: Fix implicit-fallthrough warnings when building with gcc-7+Siddhesh Poyarekar
gcc 7 onwards have additional heuristics to detect implicit fallthroughs and it fails the build with warnings for ARM as a result. There was one gcc bug[1] that I fixed but the rest are cases that gcc cannot detect due to the point at which it does the fallthrough check. Most of this patch adds __builtin_unreachable() hints in places that throw this warning to indicate to gcc that the fallthrough will never happen. The remaining cases are actually possible fallthroughs due to incorrect code running on the simulator; in which case an Unknown instruction is returned. [1] https://gcc.gnu.org/ml/gcc-patches/2018-02/msg01105.html Change-Id: I1baa9fa0ed15181c10c755c0bd777f88b607c158 Signed-off-by: Siddhesh Poyarekar <siddhesh.poyarekar@gmail.com> Reviewed-on: https://gem5-review.googlesource.com/8541 Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
2018-02-20arch-arm: Fix Hlt64,Svc64,Hvc64,Smc64,Brk64 disassemblyGiacomo Travaglini
This patch fixes the disassembly of AArch64 Exception Generating instructions, which were not printing the encoded immediate field. This has been accomplished by changing their underlying type to a newly defined one. Change-Id: If58ae3e620d2baa260e12ecdc850225adfcf1ee5 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/8368 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2018-02-16arch-arm: IMPLEMENTATION DEFINED registerGiacomo Travaglini
A new pseudo register has been added to the Misc pool. It is the implementation defined register. This kinds of registers are covered by the architecture and must be treated differently than UNIMPLEMENTED registers: their access can be trapped to EL2 (See HCR.TIDCP bit in the arm arm). Some previously undecoded registers in c9,c10,c11 have now this register type. Change-Id: Ibfc35982470b9dea0ecf39aaa6b1012a21852f53 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/7922 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2018-02-16arch-arm: Fix Secure state check in checkFPAdvSIMDTrap64Chuan Zhu
The old code does secure state check by using "el <= EL2", which mis-considers secure EL1 and EL0. This patch fixes this by using inSecureState as in ARM ARM. Change-Id: I01d847c6af022c1462b16206cbc576f15f5569fd Reviewed-by: Jack Travaglini <giacomo.travaglini@arm.com> Reviewed-on: https://gem5-review.googlesource.com/8081 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2018-02-08arch-arm: Don't change PSTATE in Illegal Exception returnGiacomo Travaglini
This patch fixes the Illegal Exception return handler. According to the armarm documentation, when PSTATE.IL is set to one because of an illegal exception return, PSTATE.{EL, nRW, SP} are unchanged. This means the Exception level, Execution state, and stack pointer selection do not change as a result of the return. Change-Id: I35f2fe68fb2822a54fc4a21930871eab7a1aaab4 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/8021 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2018-02-07arch-arm: Fix printing of the data cache maintenance instructionsNikos Nikoleris
Change-Id: I2322c7bf65b38cb07a1ea2b5dc25dfc5a0496cf0 Reviewed-by: Jack Travaglini <giacomo.travaglini@arm.com> Reviewed-on: https://gem5-review.googlesource.com/7825 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
2018-02-07arch-arm: Change function name for banked miscregsGiacomo Travaglini
This commit changes the function's name used for retrieving the index of a security banked register given the flatten index. This will avoid confusion with flattenRegId, which has a different purpose. Change-Id: I470ffb55916cb7fc9f78e071a7f2e609c1829f1a Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/7982 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2018-02-07arch-arm: Fix AArch32 SETEND InstructionGiacomo Travaglini
This patch fixes AArch32 SETEND instruction, which was previously executed unconditionally without checking (H)SCTLR.SED field. This bit enables/disables the trapping of the instruction. Change-Id: Ib3d2194c8d16c34ec2a9ab3e8090081900c1e42e Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/7981 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2018-02-07arch-arm: Correct Illegal Exception Return detectionGiacomo Travaglini
Fixed Illegal Exception Return detection, which was not covering all the documented cases. Change-Id: If08ddc1490d1c0a1fccee1489d116384770ce0a5 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/7223 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-12-21arch-arm: Fixed WFE/WFI trapping behaviourGiacomo Travaglini
This patch fixes the WFx trapping behaviour by introducing the arm arm v8 pseudocode functions: checkForWFxTrap32 and checkForWFxTrap64 Change-Id: I3db0d78b5c4ad46860e6d199c2f2fc7b41842840 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/6622 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-12-21arch-arm: Fix StaticInst encoding() methodGiacomo Travaglini
The previously introduced method was missing the machInst value to be masked. Change-Id: Ic722f7cc2abc680da1a1f19c08299338b5c859a6 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Chuan Zhu <chuan.zhu@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/6881 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-12-19arch-arm: Instruction size methods in StaticInst classGiacomo Travaglini
This patch is introducing some methods in StaticInst so that is possible to get the instruction size in byte of the instruction (can be 2 bytes in Thumb) and the correct opcode (The machInst field contains some appended metadata) Change-Id: I3bed4d9fd7c77feaeded40ded192afe445d306ea Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/6781 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-12-05arm: Add support for the dc {civac, cvac, cvau, ivac} instrNikos Nikoleris
This patch adds support for decoding and executing the following ARMv8 cache maintenance instructions by Virtual Address: * dc civac: Clean and Invalidate by Virtual Address to the Point of Coherency * dc cvac: Clean by Virtual Address to the Point of Coherency * dc cvau: Clean by Virtual Address to the Point of Unification * dc ivac: Invalidate by Virtual Addrsess to the Point of Coherency Change-Id: I58cabda37f9636105fda1b1e84a0a04965fb5670 Reviewed-by: Sudhanshu Jha <sudhanshu.jha@arm.com> Reviewed-by: Stephan Diestelhorst <stephan.diestelhorst@arm.com> Reviewed-on: https://gem5-review.googlesource.com/5060 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
2017-12-05arm: Add support for the mcr dc{ic,i,c}mvac, dccmvau instructionsNikos Nikoleris
This patch adds support for the ARMv7 cache maintenance intructions: * mcr dccmvac cleans a VA to the PoC * mcr dcimvac invalidates a VA to the PoC * mcr dccimvac cleans and invalidates a VA to the PoC * mcr dccmvau cleans a VA to the PoU Change-Id: I6511f203039ca145cc9128ddf61d09d6d7e40c10 Reviewed-by: Stephan Diestelhorst <stephan.diestelhorst@arm.com> Reviewed-by: Anouk Van Laer <anouk.vanlaer@arm.com> Reviewed-on: https://gem5-review.googlesource.com/5059 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
2017-11-21arch-arm: Fix MCR/MRC disassembleGiacomo Travaglini
This patch is fixing the Aarch32 MCR/MRC disassemble, which was previously printing unexisting integer registers as source/destination operands rather than the coprocessor register name Change-Id: I1937938c43680200cf6c5c9558e835ce2b209adc Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/5862 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-11-21arch-arm: Fix MSR/MRS disassembleGiacomo Travaglini
This patch is fixing the Aarch64 MSR/MRS disassemble, which was previously printing unexisting integer registers as source/destination operands rather than the system register name Change-Id: Iac9d5f2f2fea85abd9a398320ef7aa4844d43c0e Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/5861 Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-11-15arch-arm: Writes to DCCMVAC shouldn't flush pipelineGiacomo Travaglini
Writes to DCCMVAC (Data Cache line Clean by VA to PoC) system register shouldn't flush the pipeline as a result of the operation. This addition was wrongly introduced for supporting self-modifying code. Software barriers should be used instead. Change-Id: Idf0c27d2e49ca01be19888ae5523b8f8eaefa7b3 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/5362 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-11-15arch-arm: Removing FlushPipe fault, using SquashAfterGiacomo Travaglini
This Patch is removing the FlushPipe ArmFault, which was used for flushing the pipeline in favour of the general IsSquashAfter StaticInstr flag. Using a fault was preventing tracers from tracing barriers like ISB and from adding them to the instruction count Change-Id: I176e9254eca904694f2f611eb486c55e50ec61ff Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Giacomo Gabrielli <giacomo.gabrielli@arm.com> Reviewed-on: https://gem5-review.googlesource.com/5361 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-11-13arch-arm: Interface for the ArmStaticInst intWidth fieldGiacomo Travaglini
ARMv8 Tracers might want to be able to read the intWidth field of the ArmStaticInst object. The field is specifying the bit width of the integer registers used by the current instruction. Change-Id: Iaee3123823a2c7380917001c453377c1c12e54a7 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/5661 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-11-07alpha,arm,mips,power,riscv,sparc,x86: Merge exec decl templates.Gabe Black
In the ISA instruction definitions, some classes were declared with execute, etc., functions outside of the main template because they had CPU specific signatures and would need to be duplicated with each CPU plugged into them. Now that the instructions always just use an ExecContext, there's no reason for those templates to be separate. This change folds those templates together. Change-Id: I13bda247d3d1cc07c0ea06968e48aa5b4aace7fa Reviewed-on: https://gem5-review.googlesource.com/5401 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Alec Roelke <ar4jc@virginia.edu> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-11-02alpha,arm,mips,power,riscv,sparc,x86,isa: De-specialize ExecContexts.Gabe Black
The ISA parser used to generate different copies of exec functions for each exec context class a particular CPU wanted to use. That's since been changed so that those functions take a pointer to the base ExecContext, so the code which would generate those extra functions can be removed, and some functions which used to be templated on an ExecContext subclass can be untemplated, or minimally less templated. Now that some functions aren't going to be instantiated multiple times with different signatures, there are also opportunities to collapse templates and make many instruction definitions simpler within the parser. Since those changes will be less mechanical, they're left for later changes and will probably be done in smaller increments. Change-Id: I0015307bb02dfb9c60380b56d2a820f12169ebea Reviewed-on: https://gem5-review.googlesource.com/5381 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
2017-07-05cpu: Added interface for vector reg fileRekai Gonzalez-Alberquilla
This patch adds some more functionality to the cpu model and the arch to interface with the vector register file. This change consists mainly of augmenting ThreadContexts and ExecContexts with calls to get/set full vectors, underlying microarchitectural elements or lanes. Those are meant to interface with the vector register file. All classes that implement this interface also get an appropriate implementation. This requires implementing the vector register file for the different models using the VecRegContainer class. This change set also updates the Result abstraction to contemplate the possibility of having a vector as result. The changes also affect how the remote_gdb connection works. There are some (nasty) side effects, such as the need to define dummy numPhysVecRegs parameter values for architectures that do not implement vector extensions. Nathanael Premillieu's work with an increasing number of fixes and improvements of mine. Change-Id: Iee65f4e8b03abfe1e94e6940a51b68d0977fd5bb Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> [ Fix RISCV build issues and CC reg free list initialisation ] Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/2705
2017-07-05cpu: Simplify the rename interface and use RegIdRekai Gonzalez-Alberquilla
With the hierarchical RegId there are a lot of functions that are redundant now. The idea behind the simplification is that instead of having the regId, telling which kind of register read/write/rename/lookup/etc. and then the function panic_if'ing if the regId is not of the appropriate type, we provide an interface that decides what kind of register to read depending on the register type of the given regId. Change-Id: I7d52e9e21fc01205ae365d86921a4ceb67a57178 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> [ Fix RISCV build issues ] Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/2702
2017-07-05arch, cpu: Architectural Register structural indexingNathanael Premillieu
Replace the unified register mapping with a structure associating a class and an index. It is now much easier to know which class of register the index is referring to. Also, when adding a new class there is no need to modify existing ones. Change-Id: I55b3ac80763702aa2cd3ed2cbff0a75ef7620373 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> [ Fix RISCV build issues ] Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/2700
2017-05-19base, sim, arch: Fix clang 5.0 warningsAndreas Sandberg
Compiling gem5 with recent version of clang (4 and 5) triggers warnings that are treated as errors: * Global templatized static functions result in a warning if they are not used. These should either be declared as static inline or without the static identifier to avoid the warning. * Some templatized classes contain static variables. The instantiated versions of these variables / templates need to be explicitly declared to avoid a compiler warning. Change-Id: Ie8261144836e94ebab7ea04ccccb90927672c257 Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Curtis Dunham <curtis.dunham@arm.com> Reviewed-on: https://gem5-review.googlesource.com/3420 Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
2016-11-09style: [patch 1/22] use /r/3648/ to reorganize includesBrandon Potter
2016-10-13isa,arm: Add missing AArch32 FP instructionsMitch Hayenga
This commit adds missing non-predicated, scalar floating point instructions. Specifically VRINT* floating point integer rounding instructions and VSEL* floating point conditional selects. Change-Id: I23cbd1389f151389ac8beb28a7d18d5f93d000e7 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Nathanael Premillieu <nathanael.premillieu@arm.com>
2016-08-02arm: change instruction classes to catch hyp trapsDylan Johnson
Change-Id: I122918d0e3dfd01ae1a4ca4f19240a069115c8b7
2016-06-02arm: Rewrite ERET to behave according to the ARMv8 ARMAndreas Sandberg
The ERET instruction doesn't set PSTATE correctly in some cases (particularly when returning to aarch32 code). Among other things, this breaks EL0 thumb code when using a 64-bit kernel. This changeset updates the ERET implementation to match the ARM ARM. Change-Id: I408e7c69a23cce437859313dfe84e68744b07c98 Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Nathanael Premillieu <nathanael.premillieu@arm.com>
2016-06-02arm: Correctly check FP/SIMD access permission in aarch32Andreas Sandberg
The current implementation of aarch32 FP/SIMD in gem5 assumes that EL1 and higher are all 32-bit. This breaks interprocessing since an aarch64 EL1 uses different enable/disable bits. This change updates the permission checks to according to what is prescribed by the ARM ARM. Change-Id: Icdcef31b00644cfeebec00216b3993aa1de12b88 Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Mitch Hayenga <mitch.hayenga@arm.com> Reviewed-by: Nathanael Premillieu <nathanael.premillieu@arm.com>
2016-03-16arm: Fix disasm printingNathanael Premillieu
Fix the printDataInst function to properly print the immediate value.
2016-02-06style: fix missing spaces in control statementsSteve Reinhardt
Result of running 'hg m5style --skip-all --fix-control -a'.
2015-11-22arm: Fix fplib 128-bit shift operatorsNathanael Premillieu
Appease clang.
2015-07-28revert 5af8f40d8f2cNilay Vaish
2015-07-26cpu: implements vector registersNilay Vaish
This adds a vector register type. The type is defined as a std::array of a fixed number of uint64_ts. The isa_parser.py has been modified to parse vector register operands and generate the required code. Different cpus have vector register files now.
2015-02-16arm: Merge ISA files with pseudo instructionsAndreas Sandberg
This changeset moves the pseudo instructions used to signal unknown instructions and unimplemented instructions to the same source files as the decoder fault.
2015-01-25arm: always set the IsFirstMicroop flagAli Saidi
While the IsFirstMicroop flag exists it was only occasionally used in the ARM instructions that gem5 microOps and therefore couldn't be relied on to be correct.
2014-12-23arm: Raise an alignment fault if a PC has illegal alignmentAndreas Sandberg
We currently don't handle unaligned PCs correctly. There is one check for unaligned PCs in the TLB when running in aarch64 mode, but this check does not cover cases where the CPU does not do a TLB lookup when decoding an instruction (e.g., a branch stays within the same cache line). Additionally, the Decoder class sometimes throws an assertion for unaligned PCs which breaks speculation. This changeset introduces a decoder fault bit field in the ExtMachInst structure. This field can be used to signal a decoder failure. If set, the decoder generates an internal gem5fault instruction instead of a normal instruction. This instruction in turns either panics (fault type PANIC), returns an PCAlignmentFault (fault type UNALIGNED, aarch64) or PrefetchAbort (fault type UNALIGNED, aarch32). The patch causes minor changes to the realview64 regressions, and a stats bump will follow.
2014-11-14arm: Fixes based on UBSan and static analysisAndreas Hansson
Another churn to clean up undefined behaviour, mostly ARM, but some parts also touching the generic part of the code base. Most of the fixes are simply ensuring that proper intialisation. One of the more subtle changes is the return type of the sign-extension, which is changed to uint64_t. This is to avoid shifting negative values (undefined behaviour) in the ISA code.
2014-10-16arch: Use shared_ptr for all FaultsAndreas Hansson
This patch takes quite a large step in transitioning from the ad-hoc RefCountingPtr to the c++11 shared_ptr by adopting its use for all Faults. There are no changes in behaviour, and the code modifications are mostly just replacing "new" with "make_shared".
2014-10-01arm: More UBSan cleanups after additional full-system runsAndreas Hansson
Some incorrect casting to IntRegIndex, and a few uninitialized members in the i8254xGBe device.
2014-09-27arm: Fixed undefined behaviours identified by gccAndreas Hansson
This patch fixes the runtime errors highlighted by the undefined behaviour sanitizer. In the end there were two issues. First, when rotating an immediate, we ended up shifting an uint32_t by 32 in some cases. This case is fixed by checking for a rotation by 0 positions. Second, the Mrc15 and Mcr15 are operating on an IntReg and a MiscReg, but we used the type RegRegImmOp and passed a MiscRegIndex as an IntRegIndex. This issue is resolved by introducing a MiscRegRegImmOp and RegMiscRegImmOp with the appropriate types. With these fixes there are no runtime errors identified for the full ARM regressions.
2014-09-03arm: Make memory ops work on 64bit/128-bit quantitiesMitch Hayenga
Multiple instructions assume only 32-bit load operations are available, this patch increases load sizes to 64-bit or 128-bit for many load pair and load multiple instructions.
2014-09-03arm: Fix v8 neon latency issue for loads/storesMitch Hayenga
Neon memory ops that operate on multiple registers currently have very poor performance because of interleave/deinterleave micro-ops. This patch marks the deinterleave/interleave micro-ops as "No_OpClass" such that they take minumum cycles to execute and are never resource constrained. Additionaly the micro-ops over-read registers. Although one form may need to read up to 20 sources, not all do. This adds in new forms so false dependencies are not modeled. Instructions read their minimum number of sources.
2014-04-29arm: use condition code registers for ARM ISACurtis Dunham
Analogous to ee049bf (for x86). Requires a bump of the checkpoint version and corresponding upgrader code to move the condition code register values to the new register file.
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