Cheri-research/Toooba
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403 Commits

Author SHA1 Message Date
Jonathan Woodruff
af69f2e5db Merge branch 'CHERI' into jdw57_prediction 2021-12-15 16:47:42 +00:00
Jonathan Woodruff
34c6ee1894 Specifically give priority to wrong_spec when they conflict. 
This appears to yield 10% performance improvement as our default setup
appears to choose a wrong priority.
 2021-12-03 12:36:40 +00:00
Jonathan Woodruff
e761f18c26 Code to trace RAS predictions for measuring accuracy in simulation. 2021-11-29 12:19:00 +00:00
Franz Fuchs
37074525e1 removed unnecessary execute permissions for Decode.bsv, Exec.bsv, ProcTypes.bsv, ReorderBuffer.bsv, and AluExePipeline.bsv 2021-11-29 10:38:23 +00:00
Jonathan Woodruff
59836cc9e5 Hopefully optimise this function to have just one call to modifyOffset. 2021-11-26 11:07:12 +00:00
Jonathan Woodruff
ad149db5c0 Hopefully optimise this function to have just one call to modifyOffset. 2021-11-25 17:39:46 +00:00
Jonathan Woodruff
cc0114f645 Swap write priority, as suggested by Franz. 2021-11-16 15:40:01 +00:00
Jonathan Woodruff
7b472d4d3c Reduce area overhead by using an unguarded specfifo that does not have 
to be worst-case-sized, but can drop elements if it is full.
 2021-11-16 13:53:34 +00:00
Jonathan Woodruff
618dea1225 Feed head of RAS through to execute with training info to reset the head 
on a misprediction.
 2021-11-16 11:00:04 +00:00
Jonathan Woodruff
d56045effe Make the associative BTB compressed. 
That is, only store the bottom 16 bits of the target if the upper bits
of pc and nextPc match.
Have a single "way" dedicated to full targets.
 2021-11-15 11:50:57 +00:00
Jonathan Woodruff
54c0ccadf0 Only train from branches that have all previous branches resolved. 2021-11-12 17:55:04 +00:00
Marno
0f86f09b6a Updated copyright statement 2021-11-11 12:15:45 +00:00
Marno
6ae92f786b Checking tag and seal on rVal2 and checking type on rVal1 in a way that does not use undefined behavior. 2021-11-11 11:36:45 +00:00
Marno
4d1dc29f79 Added ccopytype_bypass 2021-11-10 11:53:26 +00:00
Jonathan Woodruff
04a5d82ff0 Go back to standard tournament predictor (which performs the best on 
CoreMark), though cleaning up slightly to use standard functions.
 2021-11-10 09:54:34 +00:00
Jonathan Woodruff
8379d77cc5 Don't use a synthesis barrier for Bht so that we don't have to add it to 
XML.  The direction predictor already has one anyway.
 2021-11-08 13:51:52 +00:00
Jonathan Woodruff
e342600cb5 Try the traditional Bht, as it seems like it might be less fiddly with 
speculative training.
 2021-11-08 12:34:07 +00:00
Jonathan Woodruff
6713505d12 Experiment with different Bht constants to see if these affect our 
benchmark.
 2021-11-05 18:52:40 +00:00
Jonathan Woodruff
d5e52a9ecb Revert to upstream direction predictors to reduce diffs and prepare for 
improvements that can be upstreamed.
Basically, only use addresses in these predictors rather than
capabilities, and just pass an address in from the FetchStage.
 2021-11-05 17:42:19 +00:00
Franz Fuchs
001c5e8347 put changing the interrupt counter and writing back to a register in the right order 2021-11-05 13:47:39 +00:00
Jonathan Woodruff
836ed5b143 Merge branch 'jdw57-jr-bsc-safety' into CHERI 2021-11-03 16:46:21 +00:00
Jonathan Woodruff
cb1858447b Fix tracing of Sc. 
Sc is unique in that it writes both memory and a register value.
This implementation works around the fact that the memory store data and
the register write data are sharing the same field in the reorder buffer
by inferring the writeback value of Sc from the byteEnable field.
 2021-11-03 12:45:15 +00:00
Jonathan Woodruff
3908c5f955 A merge resolution not included in previous commit due to not saving file. 
Doh.
 2021-11-02 18:12:05 +00:00
Jonathan Woodruff
7437c0c5e7 Some cleanups. 2021-11-02 18:09:06 +00:00
Franz Fuchs
56173bf2c2 Added interrupt counter 2021-11-02 15:48:02 +00:00
Jessica Clarke
fb1a629e07 Decode: Fix capability width mode-dependent LR/SC 
All of St, Amo, Lr and Sc use the normal 3-bit encoding for the width;
rather than add Lr and Sc to the list, switch it just to exclude Ld as
the special case that's handled by the other half of the expression.

Previously LR.C and SC.C were decoded as LR.BU and SC.BU.
 2021-10-27 15:44:23 +01:00
Jonathan Woodruff
87785eb25c Don't translate invalid vaddrs in the DTLB. 2021-10-14 17:13:18 +00:00
Jonathan Woodruff
dad3d504b1 Take into account BTB predictions. 
nextPc only reflected things known in the Decode stage, but not before
(i.e. BTB predictions).
This meant that we were pretty much always redirecting JRs.
I needed to pipe through whether a jump was predicted by the BTB or not,
and then only stop predicting if there is no nextPc prediction and also
no BTB prediction.  This should actually reasonably approximate SBC.
Also, this one is not "redirecting", it's just flushing (flipping
decode_epoch_local), trusting that we'll get a later redirection.
 2021-10-11 16:23:45 +00:00
Jonathan Woodruff
3636f6239a Use Matt's slightly cleaner version of the function. 2021-10-11 16:23:22 +00:00
Jonathan Woodruff
1b5a036c46 Two fixes: do a proper "all bits are the same" function, as well as 
prepare a capability target to pass back.
 2021-10-08 16:35:42 +00:00
Jonathan Woodruff
5d5bee3e08 Use an invalid virtual address when preventing prediction, and also 
detect invalid virtual addresses in the TLB and miss rather than proceed
with page walking.
 2021-10-08 11:00:11 +00:00
Jonathan Woodruff
cec55419f5 Merge branch 'CHERI' into jdw57-jr-bsc-safety 2021-10-08 09:50:45 +00:00
Jonathan Woodruff
3d0aee0af4 Remove some verbosity from the committed state. 2021-10-07 16:30:32 +00:00
Jonathan Woodruff
81a12b89cb Move to NonPipelinedSquareRooter to hopefully fit more 
deterministically.
We're still waiting for a fixed NonPipelinedDivider.
 2021-10-07 16:28:57 +00:00
Jonathan Woodruff
520b09a6ed Use less wierd default value. 2021-10-07 16:17:19 +00:00
Jonathan Woodruff
fe9e000f43 Merge branch 'CHERI' into jdw57-jr-bsc-safety 2021-10-04 08:37:56 +00:00
Franz Fuchs
db54d27368 Move import DReg::* into ifdefs 2021-10-01 16:54:17 +01:00
Jonathan Woodruff
c69acc2fc4 Don't predict next instruction for JR without a BTB prediction. 2021-09-30 12:20:40 +00:00
gameboo
9657339d87 "fix" non PERFORMANCE_MONITORING build 2021-09-29 18:09:06 +01:00
Franz Fuchs
b25d70a8cc performed corrections for CONTRACTS_VERIFY 2021-09-07 08:15:03 +01:00
Franz Fuchs
bc7eed67ab Did more cleaning up 2021-09-06 15:55:28 +01:00
Franz Fuchs
e33b4021d8 Integrated generateHPMVector function 2021-09-03 17:37:43 +01:00
Franz Fuchs
61d788ebc7 define No_Of_Evts in StatCounters 2021-09-03 14:14:32 +01:00
Franz Fuchs
9f615e4481 initial changes for HPM consistency 2021-09-02 14:50:17 +01:00
Robert Norton
0970951184 Fix decoding of lr / sc with explicit bounds. 
When decoding {lr,sc}.{b,h,w,d,c,q}.{ddc,cap} the IType was not being set correctly. For sc we also need to set the destination register.
 2021-09-01 10:16:49 +01:00
Peter Rugg
dbb6043760 Don't compile SelfInv* without define 2021-08-16 14:42:59 +01:00
Robert Norton
7e2a946c4c Fix incorrect check for permitStoreLocalCap in capChecksMem. 
The check was missing a NOT and was actually checking for permitStoreGlobalCap.
 2021-08-05 12:19:50 +01:00
Robert Norton
5b23f4cea0 Fix incorrect checks in capChecksMem. 
These checks were broken in several ways:

1) a missing 'else' inverted the priority of PermitStoreViolation vs. PermitStore[Local]Cap exceptions
2) another missing 'else' inverted the priority of PermitStoreCap and PermitStoreLocalCap exceptions
3) No store checks were performed when mem_func == Amo because of the preceding if clause for loads

I decided to flatten the nested if statements by pulling out the conditions into boolean local variables. Hopefully this makes it clearer (as well as fixing the bugs).
 2021-08-05 09:33:52 +01:00
Franz Fuchs
cc25ee69d3 Check in Rename stage for nextPcs of Traps 2021-07-26 07:02:21 +01:00
Franz Fuchs
483cef8852 Removed unnecessary display statements 2021-07-12 14:55:07 +02:00