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This is the rest of the code for part 2.
See http://learning.gem5.org/book/part2/simplecache.html
Change-Id: I5db099266a1196914656be3858fdd5fb4f8eab48
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-on: https://gem5-review.googlesource.com/5023
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
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Adding more code from Learning gem5 Part II
See http://learning.gem5.org/book/part2/memoryobject.html
Change-Id: Iaa9480c5cdbe4090364f02e81dc1d0a0ddac392a
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-on: https://gem5-review.googlesource.com/5022
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
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Adding more code from Learning gem5 Part II
See http://learning.gem5.org/book/part2/parameters.html
Change-Id: I9fe5655239e011c718c5cf5fd62bebcda66ea966
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-on: https://gem5-review.googlesource.com/5021
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
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This adds code from Learning gem5 Part II.
See http://learning.gem5.org/book/part2/helloobject.html
Change-Id: Ic2caa07876ca57f937729c27ce29b2cd8bf2380c
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-on: https://gem5-review.googlesource.com/5020
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
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It might often be useful to write output to cout when dumping a trie,
but sometimes it might be useful to dump ot to something else like a
string stream instead.
Change-Id: Iaa4ae772c902b7dbc753f320d1a7eb5fcd4a3db3
Reviewed-on: https://gem5-review.googlesource.com/6266
Reviewed-by: Brandon Potter <Brandon.Potter@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>
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These files aren't a collection of miscellaneous stuff, they're the
definition of the Logger interface, and a few utility macros for
calling into that interface (panic, warn, etc.).
Change-Id: I84267ac3f45896a83c0ef027f8f19c5e9a5667d1
Reviewed-on: https://gem5-review.googlesource.com/6226
Reviewed-by: Brandon Potter <Brandon.Potter@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>
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This class isn't referred to outside of misc.hh, and isn't necessarily
useful outside of the particular logging setup implemented in misc.cc.
The Logger class itself is different since it provides a generic
interface that can be used with different logging schemes.
Change-Id: Ibae926fea039d9e3d75a43d97348bc4a3c5d555e
Reviewed-on: https://gem5-review.googlesource.com/6225
Reviewed-by: Brandon Potter <Brandon.Potter@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>
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Dumping the structure of the tries being constructed was useful for
debugging when the trie data structure was being developed, but the
output can't be automatically verified easily, and what's considered
correct depends on the specific implementation of the trie itself.
To make some of the earlier tests more meaningful, additional lookups
were added which verified that the correct values were returned when
the nodes of the trie were in particular arrangements.
Change-Id: Ib464ad1804d13fe40882da2190d7bf452da83818
Reviewed-on: https://gem5-review.googlesource.com/6223
Reviewed-by: Brandon Potter <Brandon.Potter@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>
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This function casts an integer constant into a uint32_t * to make the
actual test lines a bit less verbose.
Change-Id: I9307dfd3d5861ddb9c0f6dcf4b28c846004f0a8d
Reviewed-on: https://gem5-review.googlesource.com/6222
Reviewed-by: Brandon Potter <Brandon.Potter@amd.com>
Maintainer: Gabe Black <gabeblack@google.com>
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This test doesn't really test anything other than the STL vector
implementation.
Change-Id: I1b932640b1be4fb92a44d314d0b51a94a6a324a2
Reviewed-on: https://gem5-review.googlesource.com/6221
Reviewed-by: Brandon Potter <Brandon.Potter@amd.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Gabe Black <gabeblack@google.com>
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Arm security extension introduced register banking between secure and
non-secure mode. This has been removed in armv8 using AArch64 in EL3,
where the decoded register is by default the non-secure version. Using
non-secure register infos(flags) was preventing secure execution to
access the register with the MRC/MCR at EL1.
The patch updates the following banked registers' flags so that their
non-secure version can be accessed in secure mode:
MISCREG_CSSELR, MISCREG_SCTLR, MISCREG_ACTLR, MISCREG_TTBR0,
MISCREG_TTBR1, MISCREG_TTBCR, MISCREG_DACR, MISCREG_DFSR, MISCREG_IFSR,
MISCREG_ADFSR, MISCREG_AIFSR, MISCREG_DFAR, MISCREG_IFAR, MISCREG_PAR,
MISCREG_PRRR, MISCREG_MAIR0, MISCREG_NMRR, MISCREG_MAIR1,
MISCREG_AMAIR0, MISCREG_AMAIR1, MISCREG_VBAR, MISCREG_CONTEXTIDR,
MISCREG_TPIDRURW, MISCREG_TPIDRURO, MISCREG_TPIDRPRW, MISCREG_CNTP_TVAL,
MISCREG_CNTP_CTL, MISCREG_CNTP_CVAL
For those registers the following permission bits have been set:
MISCREG_PRI_S_RD
MISCREG_PRI_S_WR
Change-Id: Ib881c526e75d69e313f8ef66eb78fc704de6bf59
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Giacomo Gabrielli <giacomo.gabrielli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/6201
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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Replace manual creation of masks for sign extension of immediates with
the sext<N> function.
Change-Id: Ief2df91a25500c64f5bcae0dcd437c1e3bb95e6c
Reviewed-on: https://gem5-review.googlesource.com/6182
Reviewed-by: Alec Roelke <ar4jc@virginia.edu>
Maintainer: Alec Roelke <ar4jc@virginia.edu>
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This patch makes mem.isa conform to style guidelines better by removing
spaces around the "ea_code" argument default value assignment of the
Load format.
Change-Id: I1c62b99de3617a3734b128b00fb421773e021317
Reviewed-on: https://gem5-review.googlesource.com/6181
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Alec Roelke <ar4jc@virginia.edu>
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Some of the files in earlier patches rearranging instruction definitions
were missing copyright and license information. This patch adds them.
Change-Id: I2ac4910a415de6032fc0b7d4422904c682e0ad87
Reviewed-on: https://gem5-review.googlesource.com/6183
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
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The BaseCPU.createThreads() method currently overrides the BaseCPU.isa
parameter. This is sometimes undesirable. Change the behavior so that
the default value for the isa parameter is the empty list and teach
createThreads() to only override the ISA if none has been specified.
Change-Id: I2ac5535e55fc57057e294d3c6a93088b33bf7b84
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jack Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Sudhanshu Jha <sudhanshu.jha@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/6121
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
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Change-Id: I811b552989caf3601ac65a128dbee6b7bb405d7f
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
[ Updated to use IsVector instruction flag. ]
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/5732
Reviewed-by: Gabe Black <gabeblack@google.com>
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This patch removes the static parts of the RISC-V atomic memory
instructions out of the ISA generated code and into arch/riscv/insts. It
also makes the LR and SC instructions subclasses of MemInst from
arch/riscv/insts/mem.hh.
Change-Id: I6591f3d171045c4f1b457eb1264bbb7bd62b3e51
Reviewed-on: https://gem5-review.googlesource.com/6025
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Alec Roelke <ar4jc@virginia.edu>
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This patch moves static portions of the memory instructions out of the
ISA generated code and puts them into arch/riscv/insts. It also
simplifies the definitions of load and store instructions by giving
them a common base class.
Change-Id: Ic6930cbfc6bb02e4b3477521e57b093eac0c8803
Reviewed-on: https://gem5-review.googlesource.com/6024
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Alec Roelke <ar4jc@virginia.edu>
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This patch removes the Unknown instruction type out of the ISA generated
code and puts it into arch/riscv/insts. Since there isn't any dynamic
behavior to it, all that's left behind is a template for creating a new
Unknown instruction.
Change-Id: If7c3258a24ecadd3e00ab74586e1740e14f028db
Reviewed-on: https://gem5-review.googlesource.com/6023
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Alec Roelke <ar4jc@virginia.edu>
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This patch removes static portions of the standard instruction types
from the generated ISA code and puts them into arch/riscv/insts. Some
dynamically-generated content is left behind for each individual
instruction's implementation. Also, BranchOp is removed due to its
similarity with ImmOp and ImmOp and UImmOp are joined into a single
templated class, ImmOp<T>.
Change-Id: I1bf47c8b8a92a5be74a50909fcc51d8551185a2a
Reviewed-on: https://gem5-review.googlesource.com/6022
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Alec Roelke <ar4jc@virginia.edu>
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All of the O3 vector stats added by 'arch: ISA parser additions of
vector registers' are currently missing their stat initializers. Add
the missing stat initialization to InstructionQueue::regStats.
Change-Id: Idc4b8e2824120a2542d8a604340a1b41bde6aa28
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/6101
Reviewed-by: Gabe Black <gabeblack@google.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
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This patch introduces the ARM pseudocode haveEL function
into gem5.
Change-Id: I0d96070959e8e13773eb7fa9964894ec0ff2cac2
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/6162
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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We sometimes need to cast the System pointer stored in a
ThreadContext to an ArmSystem pointer to query global
system setting.
Add an assertion to make sure that the cast resulted in a
valid pointer.
Change-Id: Id382d0c1dceefee8f74d070c205c7b43b83ab215
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/6161
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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Change-Id: I7c1a49c41672a1108fcf67c5505b0441f90588ef
Reviewed-on: https://gem5-review.googlesource.com/6142
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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This will let us move unit tests into the directory of the code they're
testing.
Change-Id: I611582eb00a06a848f3ce7da89f64e42660cb844
Reviewed-on: https://gem5-review.googlesource.com/6141
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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The implementation is very similar to the old test structurally, and
should test all the same things.
Change-Id: I58f1559d0943f2494ef06ee1d7ee5314a3852a8c
Reviewed-on: https://gem5-review.googlesource.com/6085
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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This type of unit test is almost the same as UnitTest, except that
it builds in the googletest library with the appropriate flags, and
it also omits all the gem5 object files by default.
Change-Id: I230db7ede563a73a9da0ebeed44aca389f724465
Reviewed-on: https://gem5-review.googlesource.com/6084
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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Git rid of the unused partial_objs variable, and change append to
extend since the result of builders is a list of nodes and not
individual nodes, even if there's only one target.
Change-Id: Ie51225d3ea699eb7da18199ac3bf3e868e3994a6
Reviewed-on: https://gem5-review.googlesource.com/5985
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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This patch creates an "insts" directory in src/arch/riscv to store
static portions of instruction definitions that aren't part of the code
generated by the ISA description. It serves as a starting point for
future patches to simplify the ISA description.
Change-Id: I6700522143f6fa6c9b18a30e1fbdc8f80cdc7afa
Reviewed-on: https://gem5-review.googlesource.com/6021
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Alec Roelke <ar4jc@virginia.edu>
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This breaks an external dependency and makes the expected command line
conform to the other unit tests. Also get rid of some ancient tests
which test adding to the ini's contents based on command line
arguments.
This test still needs to be modified so that it actually checks whether
what happened was correct.
Change-Id: I2c9ea9fa79781bceb5cd3d1419870924e8bbd45f
Reviewed-on: https://gem5-review.googlesource.com/6081
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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The make_obj function took a boolean value which just selected which
of the two lines it in would actually do something. This change breaks
it into two lambdas, make_static and make_shared, which just do
whichever line would have been requested, making the funciton name more
self descriptive and getting rid of the generally unnamed and opaque
boolean argument.
Change-Id: I457e40034b7e7f5a3e7294a8e1f15bbd42e0720e
Reviewed-on: https://gem5-review.googlesource.com/5984
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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This had only one use, and made the function more complicated than it
needed to be.
Change-Id: I22147a0c1239b457c577a6a24b423065e539833b
Reviewed-on: https://gem5-review.googlesource.com/5983
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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This flag wasn't being used. Also move the Werror code to the
SConstruct now that it's being applied universally.
Change-Id: I18b00d4b41bc1add9271ca299c020c14970a6926
Reviewed-on: https://gem5-review.googlesource.com/5982
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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These settings are invariant, so there's no reason to apply them over
and over again for the child environments used for various build
products.
Change-Id: Icb4053105e4f1c43008f2422ba30c7206b7ff365
Reviewed-on: https://gem5-review.googlesource.com/5981
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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This function doesn't seem to be used by anything. A similar one off
mechanism exists for SimObjects which is we might also be able to get
rid of.
Change-Id: I65038c3495fa69cf94042dc78f09876d5e9a557f
Reviewed-on: https://gem5-review.googlesource.com/5841
Maintainer: Gabe Black <gabeblack@google.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
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Tags are just arbitrary strings which are attached to source files
which mark them as having some property. By default, all source files
have the "gem5 lib" tag added to them which marks them as part of the
gem5 library, the primary component of the gem5 binary but also a
seperable component for use in, for example, system C.
The tags can be completely overridden by setting the "tags" parameter
on Source, etc., functions, and can be augmented by setting "add_tags"
which are tags that will be added, or alternatively additional tags.
It's possible to specify both, in which case the tags will be set to
the union of tags and add_tags. add_tags is supposed to be a way to
add extra tags to the default without actually overriding the default.
Both tags and add_tags can be a list/tuple/etc of tags, or a single
string which will be converted into a set internally.
Other existing tags include:
1. "python" for files that need or are used with python and are
excluded when the --without-python option is set
2. "main" for the file(s) which implement the gem5 binary's main
function.
3. The name of a unit test to group its files together.
4. Tags which group source files for partial linking.
By grouping the "tags" into a single parameter instead of taking all
extra parameters as tags, the extra parameters can, in the future, be
passed to the underlying scons environment. Also, the tags are either
present or not. With guards, they could be present and True, present
and False, or not present at all.
Change-Id: I6d0404211a393968df66f7eddfe019897b6573a2
Reviewed-on: https://gem5-review.googlesource.com/5822
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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Delete the current version of foo.ini which was modified, restore the
previous version, and initest.ini. Preprocess initest.ini which
includes foo.ini, and tidy up the resulting file. This file will
(mostly) get the initest unit test to work. Some other cleanups are
still necessary.
Change-Id: I4e46abc73ac89f88177eec92f572452f63ba8019
Reviewed-on: https://gem5-review.googlesource.com/6041
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Gabe Black <gabeblack@google.com>
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This has been broken since February. The interface for opening
initializing where the stats output should go was changed, but the
test wasn't updated.
Change-Id: I54bd8be15bf870352d5fcfad95ded28d87c7cc5a
Reviewed-on: https://gem5-review.googlesource.com/6001
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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Add support for software breakpoints as signalled by the aarch64 brk
instruction. This introduces a new SoftwareBreakpoint fault.
Change-Id: I93646c3298e09d7f7b0983108ba8937c7331297a
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Giacomo Gabrielli <giacomo.gabrielli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/5721
Reviewed-by: Giacomo Gabrielli <Giacomo.Gabrielli@arm.com>
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Since EL2 is not available in secure mode, any HVC call from secure mode
should be treated as undefined. This behaviour was implemented in
aarch32 HVC but not in 64 bit version
Change-Id: Ibaa4d8b1e8fe01d2ba3ef07494c09a4d3e7e87b0
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/5921
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
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This patch adds all system calls present in riscv-gnu-toolchain at
commit hash 65cb174. Many of them do not have implementations in gem5, so
they are just placeholders.
[Remove the variadic macro and replace it with a function that has
default arguments because variadic macros may not be portable across
compilers]
[Remove spaces around default arguments of createSyscall for better
style]
[Switch from using a loose function to using SyscallDesc's new
constructor]
Change-Id: Iff97c689109121b39df423c72d0e79c6366e31b9
Reviewed-on: https://gem5-review.googlesource.com/5322
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Alec Roelke <ar4jc@virginia.edu>
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This patch adds a default value of unimplementedFunc to SyscallDesc's
constructor's second argument, which makes adding system call
placeholders to SE mode cleaner.
Change-Id: I3e7efb3a887cc52d16d2095d3dd2e2a96fb882fb
Reviewed-on: https://gem5-review.googlesource.com/5501
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Brandon Potter <Brandon.Potter@amd.com>
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Change-Id: I24008c1e2a94ad8dc4cc13739214928eb846a496
Reviewed-on: https://gem5-review.googlesource.com/5483
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
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Change-Id: Ifbeee464e2d7f872e192f065ad3494f52d274596
Reviewed-on: https://gem5-review.googlesource.com/5482
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
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These were just raw C++ classes.
Change-Id: Id2101400d885c6938efb6b94f2949722cfbb94ae
Reviewed-on: https://gem5-review.googlesource.com/5481
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
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These had been marked as non-speculative so that their execute
functions would only be called if the instruction should really be
executed. Instead, we can return faults which will cause the same
behavior when the instruction is committed and let the instruction
execute as normal.
Change-Id: I39fa5073e93399424144724b99bdc12070e42286
Reviewed-on: https://gem5-review.googlesource.com/5465
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
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These are simple classes which don't need to be in the ISA description.
Change-Id: Ia0bb45f50c4da2536855efcb3c17c7780b431332
Reviewed-on: https://gem5-review.googlesource.com/5464
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
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The only thing the Unknown format does is return an instance of this
class, so there's no reason to have it in the ISA description.
Change-Id: I3f8187b1450a8622a974c030c0cb552b26f6b5f0
Reviewed-on: https://gem5-review.googlesource.com/5463
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
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The Nop format mostly just made instructions that inherited from the
Nop base class but with different mnemonics, so there doesn't need
to be very much dynamic content.
Change-Id: I1cf5e25ca8372f9b71f56d49756879c7545c9f6c
Reviewed-on: https://gem5-review.googlesource.com/5462
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
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These are for the trap and branch instructions.
Change-Id: Idedab6f3e6c6c954c1f8a36dae52976cf25ad394
Reviewed-on: https://gem5-review.googlesource.com/5461
Reviewed-by: Gabe Black <gabeblack@google.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Gabe Black <gabeblack@google.com>
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