util: Implement PIC assembly for the aarch64.

When accessing m5_mem and building PIC code, we need to get the address
of m5_mem out of the global offset table, and then load the value from
there. If we try to load from m5_mem directly, the assembled code has a
relocation type the linker can't handle when building a shared object.

Change-Id: Ieb19c3d17c37ef810559ee24b68886b18ddcc869
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27212
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

mem-ruby: Replace SLICC queueMemory calls with enqueue

Calls to queueMemoryRead and queueMemoryWrite do not consider the size
of the queue between ruby directories and DRAMCtrl which causes infinite
buffering in the queued port between the two. This adds a MessageBuffer
in between which uses enqueues in SLICC and is therefore size checked
before any SLICC transaction pushing to the buffer can occur, removing
the infinite buffering between the two.

Change-Id: Iedb9070844e4f6c8532a9c914d126105ec98d0bc
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27427
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bradford Beckmann <brad.beckmann@amd.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Bradford Beckmann <brad.beckmann@amd.com>

arch-arm, dev-arm: Autogen PSCI node in DTB

This is controlled via the python only _have_psci parameter
This flag will be checked when auto-generarting a PSCI node. A client
(e.g Linux) would then be able to know if it can use the PSCI APIs

Change-Id: I16c4a67bd358eca3dfff6c98ab8a602a31e1c751
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27387
Tested-by: kokoro <noreply+kokoro@google.com>

arch-arm: CNTHCTL trap to EL2 only if ARMv8.6-ECV implemented

In condGenericTimerCommonEL1SystemAccessTrapEL2 we were trapping
accesses to the EL1 virtual timer/counter registers to EL2, not
considering that this feature is part of ARMv8.6-ECV only
(not supported at the moment)

Change-Id: Ic03bcae436a105fb139a74126881b665ee08c912
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Adrian Herrera <adrian.herrera@arm.com>
Reviewed-by: Richard Cooper <richard.cooper@arm.com>
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27408
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>

base: Fix undefined behavior in mask generation

When generating a mask, if the number of bits is greater than
the maximum shift distance (63), the shift will have undefined
behavior. Previously the branch was taking care of a single
trespassing case, and it has been fixed to cover the remaining.

Issue-on: https://gem5.atlassian.net/browse/GEM5-205

Change-Id: Ib5a00917c8d2b23ffdb710c2f9673d956cd9f43e
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27104
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

base,arch-hsail: Fix GPU build

The GPU build is currently broken due to recent changes. This fixes
the build after changes to local access, removal of getSyscallArg,
and creating of AMO header in base.

Change-Id: I43506f6fb0a92a61a50ecb9efa7ee279ecb21d98
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27136
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Reviewed-by: Bradford Beckmann <brad.beckmann@amd.com>
Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>

scons: Fix an exception in the DictImporter on scons shutdown.

The DictImporter's __del__ method calls unload, and that imports
sys.modules so that it can remove the modules that the DictImporter had
set up as the importer goes away.

Unfortunately, the importer only goes away when python is shutting down,
and at that time some aspects of the system, namely sys.meta_path, have
been cleaned up. When unload tries to import sys, that causes an
exception which scons/python reports but which doesn't do anything bad
otherwise.

In all of the examples of this older style of import object online, none
had a __del__ method, and none worried about cleaning up sys.modules
when they went away. In light of that, I've removed the __del__ method
entirely.

Another reason I think it's safe to remove __del__ is that the importer
was not actually being deleted even when it was removed from
sys.meta_path, and all the modules it had loaded where removed from
sys.modules. I think that was because the SimObject classes that it had
set up still had references (they are used later in the SConscript), and
those would, either directly or indirectly, refer back to the modules
and the importer. Those remaining references kept the importer alive,
preventing __del__ from being called before all those other objects were
cleaned up.

I think in python 2, the order things were cleaned up just so happened
to avoid trying to import sys when it was no longer possible, but in
python 3 that changed and resulted in this exception being thrown.

I've tried building gem5 with scons running under python 2 and python 3,
and with this change there is no error at shutdown. Both also produce a
gem5 binary which can run hello world without problems.

Change-Id: Ib1f5c7403df57fc420cec7ec0fef20a164a06991
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27247
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

arch-arm: Add missing include in QARMA implementation

Change-Id: Ic8a0146968d45ab1007687686eb73639a1c85513
Signed-off-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27407
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>

configs: Enabling SimObj CLI for baremetal platform

Change-Id: I0d4059976c8fb6a1d796998af302eaa764609f86
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27347
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>

util: Update jni_gem5Op.c so it will compile again.

The header for the m5op entry points had moved. Also the names of the
entry points had been normalized to have a consistent structure. Neither
of those changes were ported to this file, making it no longer compile.

Change-Id: I890c0486bd19fe2692cce92983290e854dc87afa
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27211
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>

util: Update the m5 util Makefiles to not use javah.

In more recent versions of the JDK, the javah tool has been dropped. The
same job can be accomplished by passing a -h option to javac, telling it
where to put the header files javah would have generated.

Change-Id: Ibc543d5fa222848458f45b1945f8050b85b77ca2
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27210
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>

util: Move source files into a src directory.

This also moves the Makefiles, which will still produce build output in
the src directory. This is to prepare for a scons based build system
which will create a separate build directory with build artifacts.

Change-Id: I7c6d325e1d0a428656b2e3070b5e942515543696
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27209
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

util,x86: Use M5OP_FOREACH to define the m5op entry points for x86.

Change-Id: Idbfa3341a5e0d2cf57ce7dbe8cf45834b3aa067a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27208
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

util,sparc: Use M5OP_FOREACH to define the m5op entry points for sparc.

Change-Id: I9b125c843425ef4a7a59061d5897dd8e83e06abb
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27207
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

util: Undef M5OP at the end of assembly files that use M5OP_FOREACH.

This may not be necessary since M5OP is defined/used at the end of the
function, but it's best to clean up after ourselves.

Change-Id: I524d92cb8dc44c6004dfa8109f3b17f56dba763e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27206
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

util: Remove the subfunc arg from M5OP_FOREACH.

Now that the annotation pseudo ops are removed, the subfunction is
always zero. It is no longer decoded within gem5 either. The format of
the pseudo op func/subfunc mechanism is unchanged for compatibility, but
the subfunc field will always be zero now.

Change-Id: I2167571577b6557d06aa26d8aecaca78797f5f59
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27205
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

misc: Remove the now unused M5OP_FOREACH_ANNOTATION macro.

Change-Id: I33827c923cf02c94fea2df972919636961f3dd94
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27204
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

arch-arm, dev-arm: WakeRequest implementation

This patch provides a GIC WakeRequest implementation based on GICv3 and
FVPBasePwrCtrl models. When GICR_WAKER.ProcessorSleep is set to 1 for a
certain PE, any pending interrupt coming from the Redistributor asserts
a WakeRequest signal; if PwrStatus.WEN is set, this brings up the PE.

Change-Id: I5e8b7f0e9f7706dfcc7d2e0857f4c3b86cdc04ca
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26810
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>

util: Remove the annotation pseudo ops symbols from the m5 utility.

These pseudo ops have been removed and will no longer work with gem5.

Change-Id: Ie07a320db528cb5c628f2c194fb1672b1fcae39a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27203
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

configs: Add --wait-gdb as option to se.py

I switch between waiting and non-waiting scenario many times per day.
The BaseCPU.wait_for_remote_gdb attribute, introduced in c2baaab0ed,
makes it much less painful by saving many recompiles.
The present commit tries to go a bit further: the se.py script is
under version control, and changing it interferes with smooth git
workflow.

Change-Id: Ie65ffc44b11d78d5e7878f81f2fcdafa143c20a8
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27287
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

mem: Get rid of the now unused SecurePortProxy class.

This proxy was only used by the ARM semihosting interface which can now
use a tweaked regular TranslatingPortProxy or SETranslatingPortProxy
instead of this special purpose class.

This sort of class would still be necessary if you wanted to use
physical addresses and not virtual addresses, but presently there is no
such use. This code can be retrieved from history if it's needed in the
future.

Change-Id: Ie47a8b4bb173cba1a06bd3ca60391081987936b8
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26625
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>

arm: Make semihosting use virtual addresses.

This is in accordance with the spec. To successfully translate requests
which need their secure flag set, build a translating port proxy with
that flag enabled.

Change-Id: I6ceec12aed297c57831a368a74d8b4e41f86f4c9
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26624
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

dev-arm: Adjust idreg value in RealViewCtrl

This is to match the FVP Foundation platform.
Priviledged software could query the SYS_ID register in the V2m
Motherboard controller to extract platform information:

https://
static.docs.arm.com/100961/1110/armv8_a_fp_ug_100961_1110_00_en.pdf

In particular:

* SYS_ID[31:28] (REV) = Revision Number
** Value = 0x3 -> FVP Foundation v9.6

* SYS_ID[27:16] (HBI) = Board Number
** Value = 0x010 -> FVP Foundation platform

* SYS_ID[15:12] (BLD) = Which variant of the GIC memory is implemented
in the model
** Value = 0x1 -> (!= legacy VE memory map)

* SYS_ID[11:8] (Arch) = Architecture
** Value = 0x1 -> Architectural model (FVP)

Change-Id: Ib9395eb872cb925c029077acfdd18e48478f779b
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27184
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>

dev-arm: Fix pci_mem_base setting in VExpress_GEM5_Base

This was not actually used and DTB was generated using an hardcoded
value.

Change-Id: Ie8fd63495df5cb56418593cf0dd5432dc2992eac
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27288
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>

arch-arm: ARMv8.3 CompNum, SIMD complex number support

This patch implements the CompNum SIMD instruction for armv8.3.
This instructions are Fcadd, Fcmla(vector and element) and
Vcadd, Vcmla ( vector and element).

+ isa/decoder/thumb.isa: Decoding changes for SIMD instructions in T32
+ isa/formats/fp.isa: Decoding changes for SIMD instructions in A32
+ isa/formats/uncond.isa: Decoding changes for SIMD instructions in A32
+ isa/formats/aarch64.isa: Decoding changes for SIMD instructions in A64
+ isa/formats/neon64.isa: Decoding changes for SIMD instructions in A64
+ isa/insts/neon.isa: Vcadd, Vcmla instruction implementation
+ isa/insts/neon64.isa: Fcadd, Fcmla instruction implementation
+ isa/templates/neon.isa: Modify templates for adding byElement support

Change-Id: I7f11ce88137dad077d2cad698dcaa9a79a3f317b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27183
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>

scons: Enable LTO and partial linking with gcc >= 8.1.

The bug(s) which prevented LTO and partial linking from working with gcc
have been fixed in my local version (9.3), and according to one of the
original bug reports:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69866

A fix was committed in gcc version 8.1.

The original code left in the SConstruct describing the problem with
versions greated than 6.0 also enabled an -flinker-output option and set
it to "rel". That option doesn't show up in the gcc 8.4 documentation
even though it was added in 6.0, but in the 9.3 documentation it
describes it and says that it defaults to "rel" when the -r (partial
linking) option is used.

This *should* mean that LTO and partial linking can be used together
with no issues after version 8.1, and at most by version 9.3. If someone
finds that that isn't true, then the range of bad versions can be
expanded.

Change-Id: Ie0529d077a0042ef55e2af995d01430d1695c031
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27131
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

scons: Call summarize_warnings() when scons finishes building.

This will ensure that warnings are not all shoved off the end of the
scrollback buffer or lost in a sea of compiler lines, and that the user
will actually have a chance to see and read them.

Change-Id: I7129560482ebca903ec597f8b1cf8a9a84d98c9c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27130
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

arm: Add a callSemihosting method that figures out the width.

Change-Id: Ic94987fffd04648932e5dd085ffeef8500e335cf
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25951
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>

arm: Add a gem5 specific pseudo op semihosting call.

This is in the range of call numbers set aside for extensions. When
called, it will extract the function to use from the first argument
slot. Then it calls the pseudoInst dispatching function using an ABI
which drops the return value (which is handled by semihosting itself)
and which extracts arguments from the remaining slots in the param
structure.

This makes gem5 pseudo ops available on CPU models which support
semihosting but not instruction based or address based "magic"
operations, aka hypercalls. This includes the fast model CPUs.

Change-Id: Ic4817f2b1e6aad7784af77a1a494cf614d4d4c6c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25950
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

riscv: Fix RISCV builds by updating its use of pseudoInst().

The signature of the function and RISCV's use of it changed
simultaneously, were independently verified, and then separately merged.
The combination of the two does not build successfully.

This change updates RISCV so it uses the new signature.

Change-Id: I6a944e664640c9086583d546870ed1fbfa84a3e7
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27163
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Nils Asmussen <nils.asmussen@barkhauseninstitut.org>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>

scons: Add a mechanism to accumulate warnings to reprint at the end.

When building gem5, it's possible for warnings printed early in the
build to be quickly wisked away in a see of compile lines, never to be
seen again (or driven off the end of the scrollback buffer).

To avoid those messages getting lost or ignored, this change adds a
mechanism to aggregate them into a list so that they can be summarized
at the end of the build, successful or not.

Change-Id: Ie13320717698fcbcd3a8f8d1c062467e8d6d2914
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27129
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Gabe Black <gabeblack@google.com>

scons: Use the textwrap module to wrap warnings/errors neatly.

Otherwise the error and warning messages get chopped off and wrapped by
the terminal wherever they happened to end. That's ugly and hard to
read.

This mechanism attempts to wrap the text using the console width which
it attempts to determine in two ways, first with shutil which should
work in python 3.3 and above, and then with the curses python module. If
neither of those works, it just falls back to 80 columns which is not
ideal but is reasonable.

Change-Id: I961936295505f93f5f36eb6d9cebc5073b5f793b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27128
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

scons: Get rid of a redundant "Warning:" in the SConstruct.

The "warning()" method already prints "Warning:", so putting it in the
message itself means it gets printed twice.

Change-Id: Ic157355958fdf56739f865a926ecba071bb25c5e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27127
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>

scons: Replace find_first_prog() with the built in Detect().

The built in environment method Detect() does the same thing, that is it
finds the first program available from a list of options.

Change-Id: I3763ae5cc9dd22ee322908c0a7a2c037dc91d5a5
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27126
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>

scons: Use the lsan-suppressions file when running internal commands.

These commands (like the marshal binary) might otherwise fail with
spurious leaks detected in the python library.

Change-Id: I042c2a811d465ac03f005672f328c0fb0b594494
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27125
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

misc: Add Gabe Black as the scons and util maintainer.

Change-Id: I222c25ebd7b28ddad4bb903b6fd9e15b429b1039
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27143
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>

cpu-o3: Fix unset scoreboard in vector mode switching

This is another fix for the AArch32-AArch64 interprocessing issue
introduced in
3d15150d cpu, arch, arch-arm: Wire unused VecElem code in the O3 model.

Register mapping between AArch32 and AArch64 is explicitly defined in
ARMv8 manual. This allows software to read registers right after a state
switch without writing them first, and it is indeed common for software
to save registers to memory first before using them.

In gem5's implementation of vector mode switching, however, vectors may
not be marked as ready right after a state switch. Software reads toward
vectors at this time will stall O3CPU forever. This patch fixes this by
marking all mapped vectors (or vector elements, depending on AArch32 or
AArch64) as ready right after switching vector mode.

Change-Id: I609552c543dad8da66939c0a3079d73d48e92163
Signed-off-by: Hsuan Hsu <hsuan.hsu@mediatek.com>
Signed-off-by: Howard Wang <Howard.Wang@mediatek.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26203
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

mem-ruby: Checkpoint from MOESI_hammer Ruby hangs

Fix MOESI_hammer checkpoint hanging.
The function markRemoved() should be called before hitCallback(),
not after it. The reason is that hitCallback() checks if draining is
complete based on the value of "m_outstanding_count". And since
markRemoved() is responsible for decrementing "m_outstanding_count",
hitCallback() does not see that there are no outstanding requests.

Reported by: Timothy Hayes
Jira: https://gem5.atlassian.net/browse/GEM5-331
Change-Id: I14c34be79843b172ae994ab1792fe4ce6cf5cf6e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25683
Reviewed-by: Timothy Hayes <timothy.hayes@arm.com>
Reviewed-by: John Alsop <johnathan.alsop@amd.com>
Maintainer: Bradford Beckmann <brad.beckmann@amd.com>
Tested-by: kokoro <noreply+kokoro@google.com>

util: Add a file to suppress spurious lsan leaks in the python lib.

The python interpreter does some fancy things with memory which trips up
the lsan leak checker which comes along with asan. This file simply
tells lsan to ignore those leaks.

To use it when running a binary, set the LSAN_OPTIONS environment
variable to "suppressions=${PATH TO SUPPRESSIONS FILE}". To disable the
a report on the leaks that were suppressed, you should also set
"print_suppressions=0". Multiple options can be set by seperating them
with ":"s.

LSAN_OPTIONS=suppressions=util/lsan-suppressions:print_suppressions=0

Change-Id: Ie4d712c6b95f429e67361c41a9b545a8536f2511
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27124
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

scons: Use the scons environment when marshalling.

scons maintains an environment (in the shell sense) in the ENV
construction variable for use when running external programs. When we
run the "marshal" program which gathers up python objects to embed in
the gem5 binary, it's run by subprocess instead of through scons, and it
uses its own environment inherited from the host system.

Instead, this change makes the subprocess function use the scons
environment when calling "marshal". This ensures the environment is
consistent between this command and other commands scons runs.

This is usually not very important, but some tools like asan take
options set through the environment, and they may need to be adjusted
sometimes.

Change-Id: I671b447657ed8fad45fac7393cc1c09073bf3d3a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27123
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>

tests,misc: Updated presubmit YAML to use main.py '-t' flag

This minor change reduces the presubmit build time by about 10 to 15
minutes.

Change-Id: I3a87d1a720b17fd22a9dbdbeebfb32e4be178c56
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27064
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

tests: Migrated 10.linux-boot scons-based test to testlib

This test has purposely been designed to be easily extendible for future
x86 boot tests. Right now, it only runs two basic Ubuntu boot test
setups.

Change-Id: I81385b5dfc0764af2ec02999eb26e523bd09a595
Issue-on: https://gem5.atlassian.net/browse/GEM5-109
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26324
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

dev-arm: Don't use args and kwargs on attachIO

This is matching the attachOnChipIO style, and fixing the error of the
dma_ports kwarg being forwarded to the _attach_mem

Change-Id: Ib3ecf2fc18c488d938bbbf63eab3d7693cdb7d06
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27086
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>

arm: Return whether a semihosting call was recognized/handled.

Otherwise there's no way to determine whether the return value was from
the semihosting mechanism itself, or from one of the calls. There would
also be no way to determine whether a call had actually happened.

Change-Id: Ie2da812172fe2f9c1e2b5be95561863bd12920b1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25949
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>

arch-riscv: print information about faults.

Change-Id: Ic69b788d508bab1044b693860c7d942963bed3f9
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25646
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

arch-riscv: added support for pseudo instructions.

Change-Id: I4f73f8fcf62def8815e82555fc2a67f89efc09d1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25645
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

arch,sim: Return whether or not a pseudo inst was recognized.

Otherwise there's no way to distinguish whether return values are from
the calls themselves, including what they mean in the context (success
or failure?) or the pseudo inst dispatch function itself.

Change-Id: I3e71c277f175c69af0d1adeb3299d88d095dfa84
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25948
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Alexandru Duțu <alexandru.dutu@amd.com>

sim-se: Add special paths for MPI, libnuma, ROCm support

Add new pseudo files which are read by various runtime libraries
including MPI, libnuma, and ROCm. New paths include /proc/self/maps,
/dev/urandom, and /sys/devices/system/cpu/online.

Change-Id: I00a82788cff9d6f4f16fc56230b18be9b76c4015
Signed-off-by: Brandon Potter <Brandon.Potter@amd.com>
Signed-off-by: Michael LeBeane <Michael.Lebeane@amd.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25367
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>

arm: Optionally enable gem5 extended semihosting calls.

ARM's semihosting interface defines call numbers up to 0xff to be
for standardized use, and says that custom calls should go above this
number.

This new mechanism will let the caller decide whether it wants to
enable these extended calls, or if they should be ignored and only
standard calls should be recognized.

Change-Id: I34b01a4439c8a88242971ac486e34d810b054baf
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25947
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

sim-se: Update mmap, munmap, mremap to use MemState

This updates the syscalls for mmap, munmap, and mremap. The mmap
changes now create a virtual memory area through the MemState class
to allow for lazy allocation of mmapped regions. This provides
substantial performance boost for sparse usage of mmaps. The munmap
syscall is added to reclaim the virtual memory area reserved for the
mmapped region. The mremap syscall moves or resizes an mmapped region
and updates the corresponding virtual memory area region to keep the
page tables in sync.

Change-Id: Ide158e69cdff19bc81157e3e9826bcabc2a51140
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26863
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

sim-se: Switch to new MemState API

Switch over to the new MemState API by specifying memory regions for
stack in each ISA, changing brkFunc to use MemState for heap memory,
and calling the MemState fixup in fixupStackFault (renamed to just
fixupFault).

Change-Id: Ie3559a68ce476daedf1a3f28b168a8fbc7face5e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25366
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

sim-se: Extend MemState API to use VMAs

Extend the MemState API to handle tracking dynamically sized memory
regions of a Process class which may be added, moved, removed, or
change in size during the course of simulation. This utilizes the
virtual memory areas (VMA) class to track individual regions and
provides a fixup method to handle physical page allocation in case of
a page fault. This allows for lazy allocation of the stack, heap, and
mmap regions of memory.

Change-Id: I3ef10657e5f8e8f0e328bdf0aa15a27b1dde39bf
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25483
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

configs: Use ArmFsWorkload for Arm baremetal

Change-Id: Ie6bfdd9b30438bc6eaf22bc79dcc1690ffa039be
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26991
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

cpu: IntrControl, clear all and check helpers

This patch extends the IntrControl to provided additional member
functions for (1) clearing all pending interrupts in a PE and (2)
checking for any pending interrupt in a PE. These are intended to
be used from interrupt management related peripherals.

Change-Id: I06b553872ed469e7449b872a0716865773ace154
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26809
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

configs: Initialize atags_addr in baremetal.py

Change-Id: Iec797d4be607526d68a2813e188a32759418dbcc
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27023
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

configs: Enable Semihosting for baremetal.py

This is enabled via the --semihosting option

Change-Id: If6961cba8ec4a3aa22e788db6fe0ae54e169bb9c
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26993
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

configs: Make --disk-image optional in baremetal.py

Since the script could be used to run baremetal applications, we don't
have to enforce the presence of a disk image

Change-Id: I511515361cfd7a2e06ede0df3ddcc595de15f38b
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26992
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

power: Hook up the readlink system call.

Change-Id: I28dcbd6fb3c54479eefea26d810d10c00195cc08
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26830
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

power: Add the AT_RANDOM aux vector to the initial stack.

This is blindly used by at least modern glibc-s

Change-Id: I8ee7872c8072ee8aa1b3718e988679968ac172d0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26829
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

arm: Make the semihosting implementation use GuestABI.

Remove the ability to not have an implementation for a semihosting call
in 32 or 64 bit mode since that was not actually being used. It can be
reintroduced if needed in the future.

Turn the physProxy helper function into a static function which
maintains a single secure port proxy. That makes the proxy available
outside of the ArmSemihosting class itself.

Change-Id: Ie99e7d79c08c039384250fab0c98117554c93128
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25946
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>

arch-arm: Make load_addr_mask=0 for ArmFsLinux only

This is restoring the situaton pre:

https://gem5-review.googlesource.com/c/public/gem5/+/26466

Where load_addr_mask was set to 0 (forcing the loader to discard
the kernel entry point) for LinuxArmSystem only.

With this patch the masking is done for ArmFsLinux workloads
only and it is using the default 0xffffffffffffffff (no masking)
for common ArmFsWorkload

Change-Id: I68970edcac61ad0de79433ffd84fef580a94b480
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27024
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabeblack@google.com>

arch-arm: Fix aapcs32/aapcs64 compilation issues

Some compilers won't build ARM due to how guest ABI
has been implemented.

The error is: "left shift count >= width of type"
[-Werror=shift-count-overflow]

The error is triggered when there is a left shift > the variable size
(in bits); this leads to undefined behaviour.

This is a compile time vs run time problem; the code is technically
fine, but the compiler is not able to understand this.

For example in aapcs64:

struct Argument<Aapcs64, Integer, typename std::enable_if<
 std::is_integral<Integer>::value>::type> : public Aapcs64ArgumentBase
{
    [...]
    if (sizeof(Integer) == 16 && state.ngrn + 1 <= state.MAX_GRN) {
        Integer low = tc->readIntReg(state.ngrn++);
        Integer high = tc->readIntReg(state.ngrn++);
        high = high << 64;
        return high | low;
    }
}

Even if the sizeof operator will be evaluated at compile time,
the block will be executed at runtime: the block will still be part of
the code if Integer = uint32_t.
The compiler will then throw an error because we are left shifting an
uint32_t by 64 bits.

Error arising on:
Compiler: gcc/5.4.0
Distro: Ubuntu 16.04 LTS

Change-Id: Iaafe030b7262c5fb162afe7118ae592a1a759a58
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26990
Reviewed-by: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

mem: Remove a check that the memory size is a multiple of the page size.

There are a few problems with this check.

1. Many ISAs support multiple page sizes.
2. Memories (particularly small ROMs) may not actually be in multiples
   of the page size.
3. In a heterogenous environment, there won't be a single page size even
   if each ISA picks a canonical page size.
4. Other than catching some egregious configuration mistakes, there's
   nothing functionally wrong/different about a memory that isn't evenly
   coverable in pages, especially in systems or configurations that
   don't even use paging.

Change-Id: I3cd241657318d2e3fd5a1226cb54fdebbf172788
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26423
Maintainer: Gabe Black <gabeblack@google.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>

mips: Add the AT_RANDOM aux vector to the initial stack.

This is blindly used by at least modern glibc-s

Change-Id: I8fb904d487d0cb5f7747d063a6ed84894ee6b905
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26828
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

sparc: Hook up fstat64 for SPARC64.

This seems to be used by a modern gcc toolchain.

Change-Id: Ia776f4d8b3f290336047d3a7e57f1bffac1feaa2
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26827
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

sparc: Add a definition of tgt_stat64 for SPARC64.

Change-Id: Ided4710d47436fbf8e34be2427dc7ed092a69f56
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26826
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

sparc: Hook up but not implement the get/set context traps.

gem5 will panic if it encounters a trap it doesn't know what to do with.
Newer versions of glibc, gcc, etc., use the getcontext trap in setjmp
during startup.

This change hooks up a function for both the getcontext and setcontext
traps. The getcontext one just warns that it isn't implemented. If the
context it creates is never used (likely) then that should be fine for
now. If we ever try to actually use a context with setcontext, then
something bad will almost certainly happen if it's not implemented, and
we panic.

Change-Id: Id6797ac6955249d299e975c9c30360920d380e60
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26825
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

dev-arm: Add flash1 memory to VExpress_GEM5 platform

Change-Id: I013241ac99fe42cdef437a396732447726beedd0
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26833
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

dev-arm: Instantiate FVPBasePwrCtrl in VExpress_GEM5

Change-Id: I9390570ce459adece930dbbfad050bfb1100dfd2
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26832
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

util: Add some settings files for build_cross_gcc.

These files have settings for 32 and 64 bit ARM, MIPS, POWER, RISCV, and
SPARC. When used with the versions of toolchain components below, they
all generate working hello world binaries.

binutils-2.34
gcc-9.3.0
glibc-2.31
linux-5.5.9
gdb-9.1

The script was unable to install the c++ standard headers (step 8)
because a constant was not found when building one of the sanitizers. I
don't know exactly why this happens, but I suspect it's independent of
the build process.

Change-Id: I9f0068b77edf338ed63b95f007454c07651aa42a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26764
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>

tests,learning-gem5: Moved MIPS ISA test from part 1 to long

The learning gem5 part 1 tests were the only "quick" tests requiring the
MIPS ISA to be compilated. This is a big cost for two very simple tests.
The MIPS ISA tests for learning gem5 part 1 have been moved to the
"long" tests.

Change-Id: I694541b4c7ea84e91262f29c67fb5ec2bbbc6fec
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26844
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>

misc: Added Dockerfile for clang

This will create a Docker image with all gem5 dependencies, allowing for
a specific clang version to be specified via `--build args version=X`.
I.e., to create an image with clang 6,
`docker build util/dockerfiles/clang-version --build-arg version=6`

Issue-on: https://gem5.atlassian.net/browse/GEM5-235
Change-Id: I7d12acd265d7aef2a9e90f348f4214231effe509
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26484
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

misc: Added Dockerfile for GCC of different versions

This will create a Docker image with all gem5 dependencies, allowing for
a specfic GCC version to be specified via `--build-arg version=X`. I.e.,
to create an image with GCC 8,
`docker build util/dockerfiles/gcc-version --build-arg version=8`.

Issue-on: https://gem5.atlassian.net/browse/GEM5-228
Change-Id: I927eb90b6446059cce70e3b722a8fc3985068285
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26507
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

misc: Added Dockerfile for minimum gem5 dependencies

This will create a Docker image with the minimum dependencies to build
and run gem5.

Issue-on: https://gem5.atlassian.net/browse/GEM5-236
Change-Id: Ia0ed1a84718dcd15895badf8618a661277f8349c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26583
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

misc: Added Dockerfile for Python3

This will create a docker image with all gem5 dependencies in a Python3
virtual environment.

Issue-on: https://gem5.atlassian.net/browse/GEM5-392
Change-Id: Id23777fb698977e92437c546f1fdf0ea0faa8708
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26506
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

mem-ruby: MESI_Three_Level discriminate L0 invalidation reason

The L0 cache can now know whether a line is being invalidated
due to this cache/core's own requirements, e.g. a load from the core
causing a line eviction, or due to another cache/core's requirements,
e.g. a remote cache requesting a present line in exclusive state.

Change-Id: If57bfb92b6c8f575ca47d984606be7c859dcff9a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24259
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>

mem-ruby: MESI_Three_Level fix L1 MRU absence

The L1 cache is updating the MRU tag after acessing a cache line.
This patch updates MRU for cases when the L0 cache loads/stores
a line from/to the L1 cache.

Change-Id: I1f0ccef26b3c7614dc865a38c39145840dabfd01
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24258
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>

mem-ruby: MESI_Three_Level fix L1 in_port ranks

The L1 cache contains three in_port networks with ranks 0-2-3.
This is a benign typo, however, this patch corrects the ranks to
0-1-2 for clarity.

Change-Id: Id9bb63dae310af0f962345a114b0ccb8bddcf696
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24257
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>

arch,sim: Merge Process::syscall and Process::getDesc.

When handling a system call, external code would call Process::syscall
which would extract the syscall number, that would call the base
class' doSyscall method, that would call into the subclass' getDesc
to get the appropriate descriptor, and then doSyscall would check
that a syscall was found and call into it.

Instead, we can just make the SyscallDescTable optionally check for
missing syscalls (in case we want to check multiple tables), and
make syscall look up the appropriate descriptor and call it. The base
implementation of syscall would then do the only bit of doSyscall that
is no longer being handled, incrementing the numSyscalls stat.

Change-Id: If102c156830ed2997d177dc6937cc85dddadf3f9
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24119
Tested-by: kokoro <noreply+kokoro@google.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Maintainer: Gabe Black <gabeblack@google.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>

arch,sim: Drop the syscall number from the syscall func signature.

This value is almost never used, and is now part of the SyscallDesc.

Change-Id: Ia4ffc19774bb2eac8f29134e3765c06a264407b6
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24118
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

arch,sim: Create a common structure to hold syscall tables.

Also add the syscall number into the SyscallDesc class.

The common table structure is basically just a map that extracts its
key value from the SyscallDesc class using a new num() accessor. By
using a map instead of an array (like RISCV was already doing), it's
easy to support gaps of arbitrary size and non-zero offsets of groups
of system calls without lots of filler or additional logic. This
simplified the ARM system call tables in particular which had a lot
of filler entries.

Also, both the 32 and 64 bit ARM syscall tables had entries for a
syscall at 123456 which was the "Angel SWI system call". This value
is actually the immediate constant passed to the SWI system call
instruction and is not interpreted as the system call number in linux.
This constant can be intercepted by hardware or a simulator to, for
instance, implement ARM semihosting.

Also, that constant in combination with the SWI instruction is only
used for semihosting in 32 bit ARM mode, not in 64 bit mode or in
thumb.

Since checking for that system call number was very likely a mistake
from misinterpreting how the semihosting calls work, this change
drops those checks.

Change-Id: I9b2a902d7326791449cf0e1b98e932dcadba54f7
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24117
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

sim: Get rid of the Arguments class.

This class read arguments using the arch specific getArgument function
and then presented the arguments as an array. The problem with that
approach is that it's not possible to tell where different arguments
are without knowing the types of previous arguments, and not all
arguments can be simply represented as a native sized integer.

This class has been phased out and is no longer needed.

Change-Id: Ibb4c529fe8c51fd0ae15ed3b6ea30543ad9c23e0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24115
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

mem-ruby: MESI_Three_level HTML reference generation fix

The SLICC HTML generator does not work without the 'desc' property of
the STATES and EVENTS found in the protocol state machine source files.
This adds the 'desc' property in MESI_Three_Level to declarations where
it was missing and cleans up the text of some existing ones.

Issue-on: https://gem5.atlassian.net/browse/GEM5-357

Change-Id: I2d0f8e11889554063fed798e724217963d4a74de
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24256
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

sparc: Add the AT_RANDOM aux vector to the initial stack.

This is blindly used by at least modern glibc-s

Change-Id: I175ce5f1495e367badf0fab32f5837e3cdfa955a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26824
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Gabe Black <gabeblack@google.com>

util: Add the ability to build a cross GDB to build_cross_gcc.py.

This is a very simple extension to what's already there.

Change-Id: I07e3711244e0de96b215f16ec05c660b19e462b5
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26765
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Gabe Black <gabeblack@google.com>

base: Convert the annotation methods to take actual arguments.

Feed the arguments in from the decoder.

Change-Id: Ie2dcd09320a5de02bb91b8743fc643c446e506e7
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24114
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>

arm,kern: Use GuestABI to call printk from the kernel.

Change-Id: I07b0f1c01f5ec8d6761903fa4aa15b9e8ae35069
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24113
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>

arm: Use a non-template indexed version of laneView in aapcs32.

The lane number is constant over its lifetime, but is computed with a
variable i which is not a compile time constant. It therefore can't be
used as a template parameter, and should be marked as const and not
constexpr.

Change-Id: Ie0b950311495831d5224a8fb397cf42d5cf5f25b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26834
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

util: Add a script to help build cross compilers.

Cross compilers are very useful when working with gem5. The how-to this
script is based on assumed the compiler was targeting linux, so there
isn't any support for compilers targeting other or no OS. That might be
possible to add in the future.

Change-Id: I2cb30ecbdd4c6292146ea64940348c24385046f9
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26763
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

tests: Add --bin-path option to insttest regressions

Change-Id: I229f37782b1c3650dc71ee481823b41f6f67e590
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26483
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>

arch-arm: Fix ArmSystem::_resetAddr evalutation

With:

https://gem5-review.googlesource.com/c/public/gem5/+/26466

The ArmSystem reset address (_resetAddr) is always forced by the
workload:

 _resetAddr = workload->entry

So there is no possibility to manually specify a reset address.

This was not the case before:
The resetAddr was forced only if auto_reset_addr was true or if there
was an associated bootloader to the kernel image. In that case even if
auto_reset_addr was false, the reset address was determined by the
bootloader entry.
This was also not ideal (but it was working)

This patch is cleaning all of this:

If you want to have automatic detection (recommended), you would need to
set auto_reset_addr (now turned to true by default).  This will allow to
keep most fs script untouched.  If you don't want to use automatic
detection, set auto_reset_addr to False and provide your own reset
address.

Change-Id: I5d7a55fd9060b9973c7d5b5542bd199950e1073e
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26723
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabeblack@google.com>

dev-arm: SMMUv3, single interconnect attachment

The attachment (port binding) of the SMMUv3 master and control
ports is independent of the connection of device masters to it.

This behaviour is now moved from SMMUv3::connect to
RealView::attachSmmu, as it is a responsibility of the Platform
designer.

This fixes crashes when connecting multiple device masters.

Change-Id: If1e8f55d51876fe761f881e3044ffec637c21b09
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26923
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com>

sim-se: Implement Virtual Memory Area API

Virtual memory areas are used to track regions of memory which may
change over the course of execution, such as heap, stack, and mmap. It
is a high-level mimicry of Linux' memory management. VMAs are intended
to be used to support lazy allocation of physical pages to valid VMAs
as the virtual addresses are touched. Lazy allocation increases speed
of simulation for SE mode processes which, for example, mmap large
files.

The VMAs can also be queried to generate a map of the process' memory
which is used in some libraries such as pthreads.

This changeset only adds APIs for virtual memory areas. These are used
in a subsequent changeset.

Change-Id: Ibbdce5be79a95e3231d2e1c9ee8f397b4503f0fb
Signed-off-by: Brandon Potter <Brandon.Potter@amd.com>
Signed-off-by: Michael LeBeane <Michael.Lebeane@amd.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/25365
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

mem: Add a Request::Flags parameter to the translating port proxies.

These flags will be given to the Request object which is used to do the
translation.

Change-Id: I21755f5f9369311e2f2d5be73ebd4f5865f73265
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26623
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>

arch,base,cpu,dev,kern,mem,sim: Drop FS from FSTranslatingPortProxy.

This translating proxy can be used in FS, or in SE with a failure
handing case in place.

Change-Id: I2e6421f52529fa833e42f8d3e64d4341c282634f
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26551
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>

arch,cpu,mem,sim: Reimplement the SE translating proxy using the FS one.

The only functional difference between them was that the SE one might
have optionally fixed up missing translations for demand paging.

This lets us get rid of some code recreating the proxy ports in
setProcessPtr since the SE translating port no longer keeps a copy of
the process object pointer.

Change-Id: Id97df1874f1de138ffd4f2dbb5846dda79d9e4ac
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26550
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>

sparc: Make translateFunctional ignore alignment and use the page tables.

translateFunctional might be used with unaligned addresses which should
be allowed in that context. Also, in SE mode, if the translation isn't
in the TLB itself, then it should be looked up in the SE mode fake page
tables and not in a page table resident in memory.

Change-Id: Ibb39685cfdcd4eb6cb8a0486a1de014a4e452518
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26831
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

arch: Eliminate vtophys and its switching header file.

This function is no longer used anywhere in gem5.

Small helper functions which had been put alongside vtophys on ARM and
RISCV were also moved into src/arch/arm/remote_gdb.cc and
src/arch/power/pagetable.hh, the only places they were used.

Change-Id: Iba72f6c4b797a35a785a5bb781d602c943541fa7
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26234
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

mem: Make the FSTranslatingPortProxy stop using vtophys.

That was the only place vtophys was still being used. Instead, use the
data TLB to translate functional, and if that fails try the the
instruction TLB.

Change-Id: Ie5e1e1b5d470f010e25482d785f111dc4292db60
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/26233
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

arm: Demote PCEvent subclass pointers to PCEvent pointers.

Nothing is actually accessed through these pointers. This simplifies
their declration, and gives more flexibility when setting up those
events.

Change-Id: If857de5c8df37b6ead7eae53e3c0c6c3103938c0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24112
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>