Commit Graph

291 Commits

Author SHA1 Message Date
Richard Henderson a120d32097 include/exec: Implement cpu_mmu_index generically
For user-only mode, use MMU_USER_IDX.
For system mode, use CPUClass.mmu_index.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2024-02-03 16:46:10 +10:00
Richard Henderson 1764ad70ce include/qemu: Add TCGCPUOps typedef to typedefs.h
QEMU coding style recommends using structure typedefs.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2024-01-29 21:04:10 +10:00
Anton Johansson 85c19af63e include/exec: Use vaddr in DisasContextBase for virtual addresses
Updates target/ QEMU_LOG macros to use VADDR_PRIx for printing updated
DisasContextBase fields.

Signed-off-by: Anton Johansson <anjo@rev.ng>
Message-Id: <20240119144024.14289-10-anjo@rev.ng>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2024-01-29 07:06:03 +10:00
Anton Johansson 32f0c394bb target: Use vaddr in gen_intermediate_code
Makes gen_intermediate_code() signature target agnostic so the function
can be called from accel/tcg/translate-all.c without target specifics.

Signed-off-by: Anton Johansson <anjo@rev.ng>
Message-Id: <20240119144024.14289-9-anjo@rev.ng>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2024-01-29 07:06:03 +10:00
Brian Cain bbe4209c8b target/hexagon: reduce scope of def_regnum, remove dead assignment
This is intended to address a coverity finding: CID 1527408.

Signed-off-by: Brian Cain <bcain@quicinc.com>
Reviewed-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Message-Id: <20240114234453.4114587-1-bcain@quicinc.com>
2024-01-21 22:02:48 -08:00
Taylor Simpson cbb9d7157d Hexagon (target/hexagon) Remove old dectree.py
Now that we are using QEMU decodetree.py, remove the old decoder

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20240115221443.365287-4-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:02:44 -08:00
Taylor Simpson f6c01009b5 Hexagon (target/hexagon) Use QEMU decodetree (16-bit instructions)
Section 10.3 of the Hexagon V73 Programmer's Reference Manual

A duplex is encoded as a 32-bit instruction with bits [15:14] set to 00.
The sub-instructions that comprise a duplex are encoded as 13-bit fields
in the duplex.

Create a decoder for each subinstruction class (a, l1, l2, s1, s2).

Extend gen_trans_funcs.py to handle all instructions rather than
filter by instruction class.

There is a g_assert_not_reached() in decode_insns() in decode.c to
verify we never try to use the old decoder on 16-bit instructions.

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20240115221443.365287-3-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:02:40 -08:00
Taylor Simpson 1547a2d339 Hexagon (target/hexagon) Use QEMU decodetree (32-bit instructions)
The Decodetree Specification can be found here
https://www.qemu.org/docs/master/devel/decodetree.html

Covers all 32-bit instructions, including HVX

We generate separate decoders for each instruction class.  The reason
will be more apparent in the next patch in this series.

We add 2 new scripts
    gen_decodetree.py        Generate the input to decodetree.py
    gen_trans_funcs.py       Generate the trans_* functions used by the
                             output of decodetree.py

Since the functions generated by decodetree.py take DisasContext * as an
argument, we add the argument to a couple of functions that didn't need
it previously.  We also set the insn field in DisasContext during decode
because it is used by the trans_* functions.

There is a g_assert_not_reached() in decode_insns() in decode.c to
verify we never try to use the old decoder on 32-bit instructions

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20240115221443.365287-2-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:02:33 -08:00
Taylor Simpson 7ee328804c Hexagon (target/hexagon) Remove dead functions from hex_common.py
These functions are no longer used after making the generators
object oriented.

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20231210220712.491494-10-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:02:30 -08:00
Taylor Simpson 800abf87b0 Hexagon (target/hexagon) Remove unused WRITES_PRED_REG attribute
This is the only remaining use of the is_written function.  We will
remove it in the subsequent commit.

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20231210220712.491494-9-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:02:26 -08:00
Taylor Simpson 66fab981c0 Hexagon (target/hexagon) Make generators object oriented - gen_analyze_funcs
This patch conflicts with
https://lists.gnu.org/archive/html/qemu-devel/2023-11/msg00729.html
If that series goes in first, we'll rework this patch and vice versa.

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20231210220712.491494-8-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:02:21 -08:00
Taylor Simpson c90e3103a3 Hexagon (target/hexagon) Make generators object oriented - gen_op_regs
Reviewed-by: Brian Cain <bcain@quicinc.com>
Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Message-Id: <20231210220712.491494-7-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:02:18 -08:00
Taylor Simpson 1f03e9a94e Hexagon (target/hexagon) Make generators object oriented - gen_idef_parser_funcs
Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20231210220712.491494-6-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:02:13 -08:00
Taylor Simpson a3295f5436 Hexagon (target/hexagon) Make generators object oriented - gen_helper_funcs
Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20231210220712.491494-5-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:02:10 -08:00
Taylor Simpson c568919f98 Hexagon (target/hexagon) Make generators object oriented - gen_helper_protos
Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20231210220712.491494-4-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:02:05 -08:00
Taylor Simpson b44780740d Hexagon (target/hexagon) Make generators object oriented - gen_tcg_funcs
The generators are generally a bunch of Python if-then-else
statements based on the regtype and regid.  Encapsulate regtype/regid
into a class hierarchy.  Clients lookup the register and invoke
methods.

This has several advantages for making the code easier to read,
understand, and maintain
- The class name makes it more clear what the operand does
- All the methods for a given type of operand are together
- Don't need hex_common.bad_register
  If a regtype/regid is missing, the lookup in hex_common.get_register
  will fail
- We can remove the functions in hex_common that use regtype/regid
  (e.g., is_read)

This patch creates the class hierarchy in hex_common and converts
gen_tcg_funcs.py.  The other scripts will be converted in subsequent
patches in this series.

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20231210220712.491494-3-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:01:59 -08:00
Taylor Simpson 421b53d589 Hexagon (target/hexagon) Clean up handling of modifier registers
Currently, the register number (MuN) for modifier registers is the
modifier register number rather than the index into hex_gpr.  This
patch changes MuN to the hex_gpr index, which is consistent with
the handling of control registers.

Note that HELPER(fcircadd) needs the CS register corresponding to the
modifier register specified in the instruction.  We create a TCGv
variable "CS" to hold the value to pass to the helper.

Reviewed-by: Brian Cain <bcain@quicinc.com>
Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Message-Id: <20231210220712.491494-2-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:01:42 -08:00
Taylor Simpson ccdae09a80 Hexagon (target/hexagon) Fix shadow variable when idef-parser is off
Adding -Werror=shadow=compatible-local causes Hexagon not to build
when idef-parser is off.  The "label" variable in CHECK_NOSHUF_PRED
shadows a variable in the surrounding code.

Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20231130183955.54314-1-ltaylorsimpson@gmail.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
2024-01-21 22:01:24 -08:00
Gavin Shan ee0b8ced56 target/hexagon: Use generic cpu_list()
No changes in the output from the following command.

[gshan@gshan q]$ ./build/qemu-hexagon -cpu ?
Available CPUs:
  v67
  v68
  v69
  v71
  v73

Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20231114235628.534334-12-gshan@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2024-01-05 16:20:14 +01:00
Philippe Mathieu-Daudé d5be19f514 cpu: Call object_class_dynamic_cast() once in cpu_class_by_name()
For all targets, the CPU class returned from CPUClass::class_by_name()
and object_class_dynamic_cast(oc, CPU_RESOLVING_TYPE) need to be
compatible. Lets apply the check in cpu_class_by_name() for once,
instead of having the check in CPUClass::class_by_name() for individual
target.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Gavin Shan <gshan@redhat.com>
Message-ID: <20231114235628.534334-4-gshan@redhat.com>
2024-01-05 16:20:14 +01:00
Samuel Tardieu 57c3150acc target/hexagon/idef-parser/prepare: use env to invoke bash
This file is the only one involved in the compilation process which
still uses the /bin/bash path.

Signed-off-by: Samuel Tardieu <sam@rfc1149.net>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Message-ID: <20231123211506.636533-1-sam@rfc1149.net>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2023-11-28 14:26:37 +01:00
Philippe Mathieu-Daudé 3a9d0d7b64 hw/cpu: Call object_class_is_abstract() once in cpu_class_by_name()
Let CPUClass::class_by_name() handlers to return abstract classes,
and filter them once in the public cpu_class_by_name() method.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230908112235.75914-3-philmd@linaro.org>
2023-11-07 13:08:48 +01:00
Philippe Mathieu-Daudé 9348028e7e target: Move ArchCPUClass definition to 'cpu.h'
The OBJECT_DECLARE_CPU_TYPE() macro forward-declares each
ArchCPUClass type. These forward declarations are sufficient
for code in hw/ to use the QOM definitions. No need to expose
these structure definitions. Keep each local to their target/
by moving them to the corresponding "cpu.h" header.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231013140116.255-13-philmd@linaro.org>
2023-11-07 13:08:48 +01:00
Philippe Mathieu-Daudé 7b6917b9b9 target/hexagon: Declare QOM definitions in 'cpu-qom.h'
"target/foo/cpu.h" contains the target specific declarations.

A heterogeneous setup need to access target agnostic declarations
(at least the QOM ones, to instantiate the objects).

Our convention is to add such target agnostic QOM declarations in
the "target/foo/cpu-qom.h" header.
Add a comment clarifying that in the header.

Extract QOM definitions from "cpu.h" to "cpu-qom.h".

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20231013140116.255-8-philmd@linaro.org>
2023-11-07 12:13:27 +01:00
Philippe Mathieu-Daudé 6ee45fac56 target: Unify QOM style
Enforce the style described by commit 067109a11c ("docs/devel:
mention the spacing requirement for QOM"):

  The first declaration of a storage or class structure should
  always be the parent and leave a visual space between that
  declaration and the new code. It is also useful to separate
  backing for properties (options driven by the user) and internal
  state to make navigation easier.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Message-Id: <20231013140116.255-2-philmd@linaro.org>
2023-11-07 12:13:27 +01:00
Brian Cain 20c34a9216 target/hexagon: fix some occurrences of -Wshadow=local
Of the changes in this commit, the changes in `HELPER(commit_hvx_stores)()`
are less obvious.  They are required because of some macro invocations like
SCATTER_OP_WRITE_TO_MEM().

e.g.:

    In file included from ../target/hexagon/op_helper.c:31:
    ../target/hexagon/mmvec/macros.h:205:18: error: declaration of ‘i’ shadows a previous local [-Werror=shadow=compatible-local]
      205 |         for (int i = 0; i < sizeof(MMVector); i += sizeof(TYPE)) { \
          |                  ^
    ../target/hexagon/op_helper.c:157:17: note: in expansion of macro ‘SCATTER_OP_WRITE_TO_MEM’
      157 |                 SCATTER_OP_WRITE_TO_MEM(uint16_t);
          |                 ^~~~~~~~~~~~~~~~~~~~~~~
    ../target/hexagon/op_helper.c:135:9: note: shadowed declaration is here
      135 |     int i;
          |         ^
    In file included from ../target/hexagon/op_helper.c:31:
    ../target/hexagon/mmvec/macros.h:204:19: error: declaration of ‘ra’ shadows a previous local [-Werror=shadow=compatible-local]
      204 |         uintptr_t ra = GETPC(); \
          |                   ^~
    ../target/hexagon/op_helper.c:160:17: note: in expansion of macro ‘SCATTER_OP_WRITE_TO_MEM’
      160 |                 SCATTER_OP_WRITE_TO_MEM(uint32_t);
          |                 ^~~~~~~~~~~~~~~~~~~~~~~
    ../target/hexagon/op_helper.c:134:15: note: shadowed declaration is here
      134 |     uintptr_t ra = GETPC();
          |               ^~

Reviewed-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20231008220945.983643-3-bcain@quicinc.com>
2023-10-18 16:56:17 -07:00
Matheus Tavares Bernardino 3bd8359379 target/hexagon: move GETPC() calls to top level helpers
As docs/devel/loads-stores.rst states:

  ``GETPC()`` should be used with great care: calling
  it in other functions that are *not* the top level
  ``HELPER(foo)`` will cause unexpected behavior. Instead, the
  value of ``GETPC()`` should be read from the helper and passed
  if needed to the functions that the helper calls.

Let's fix the GETPC() usage in Hexagon, making sure it's always called
from top level helpers and passed down to the places where it's
needed. There are a few snippets where that is not currently the case:

- probe_store(), which is only called from two helpers, so it's easy to
  move GETPC() up.

- mem_load*() functions, which are also called directly from helpers,
  but through the MEM_LOAD*() set of macros. Note that this are only
  used when compiling with --disable-hexagon-idef-parser.

  In this case, we also take this opportunity to simplify the code,
  unifying the mem_load*() functions.

- HELPER(probe_hvx_stores), when called from another helper, ends up
  using its own GETPC() expansion instead of the top level caller.

Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Reviewed-by: Taylor Simpson <ltaylorsimpson@gmail.com>
Message-Id: <2c74c3696946edba7cc5b2942cf296a5af532052.1689070412.git.quic_mathbern@quicinc.com>-ne
Reviewed-by: Brian Cain <bcain@quicinc.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20231008220945.983643-2-bcain@quicinc.com>
2023-10-18 16:56:17 -07:00
Paolo Bonzini e41c40d101 target/hexagon: avoid invalid escape in Python string
This is an error in Python 3.12; fix it by using a raw string literal.

Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-10-17 15:20:53 +02:00
Richard Henderson 8fa08d7ec7 accel/tcg: Remove cpu_set_cpustate_pointers
This function is now empty, so remove it.  In the case of
m68k and tricore, this empties the class instance initfn,
so remove those as well.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-10-04 11:03:54 -07:00
Richard Henderson b77af26e97 accel/tcg: Replace CPUState.env_ptr with cpu_env()
Reviewed-by: Anton Johansson <anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-10-04 11:03:54 -07:00
Richard Henderson ad75a51e84 tcg: Rename cpu_env to tcg_env
Allow the name 'cpu_env' to be used for something else.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-10-03 08:01:02 -07:00
Richard Henderson 3b3d7df545 accel/tcg: Move CPUNegativeOffsetState into CPUState
Retain the separate structure to emphasize its importance.
Enforce CPUArchState always follows CPUState without padding.

Reviewed-by: Anton Johansson <anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-10-03 08:01:02 -07:00
Richard Henderson f669c99241 target/*: Add instance_align to all cpu base classes
The omission of alignment has technically been wrong since
269bd5d8f6, where QEMU_ALIGNED was added to CPUTLBDescFast.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-10-03 08:01:02 -07:00
Michael Tokarev 6c67d98c4a hexagon: spelling fixes
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Brian Cain <bcain@quicinc.com>
2023-09-08 13:08:52 +03:00
Philippe Mathieu-Daudé 026ad97e07 target/translate: Remove unnecessary 'exec/cpu_ldst.h' header
All these files only access the translator_ld/st API declared
in "exec/translator.h". The CPU ld/st API from declared in
"exec/cpu_ldst.h" is not used, remove it.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230828221314.18435-5-philmd@linaro.org>
2023-08-31 19:47:43 +02:00
Anton Johansson bb5de52524 target: Widen pc/cs_base in cpu_get_tb_cpu_state
Signed-off-by: Anton Johansson <anjo@rev.ng>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230621135633.1649-4-anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-06-26 17:32:59 +02:00
Richard Henderson d654e92817 target/*: Add missing includes of exec/translation-block.h
This had been pulled in via exec/exec-all.h, via exec/translator.h,
but the include of exec-all.h will be removed.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-06-05 12:04:29 -07:00
Richard Henderson c213ee2dfc tcg: Split helper-proto.h
Create helper-proto-common.h without the target specific portion.
Use that in tcg-op-common.h.  Include helper-proto.h in target/arm
and target/hexagon before helper-info.c.inc; all other targets are
already correct in this regard.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-06-05 12:04:29 -07:00
Richard Henderson d53106c997 tcg: Pass TCGHelperInfo to tcg_gen_callN
In preparation for compiling tcg/ only once, eliminate
the all_helpers array.  Instantiate the info structs for
the generic helpers in accel/tcg/, and the structs for
the target-specific helpers in each translate.c.

Since we don't see all of the info structs at startup,
initialize at first use, using g_once_init_* to make
sure we don't race while doing so.

Reviewed-by: Anton Johansson <anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-06-05 12:04:29 -07:00
Richard Henderson 13e27d1fa4 target/hexagon: Include helper-gen.h where needed
This had been included via tcg-op-common.h via tcg-op.h,
but that is going away.  In idef-parser.y, shuffle some
tcg related includes into a more logical order.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-06-05 12:04:28 -07:00
Matheus Tavares Bernardino 2babbd9390 Hexagon: fix outdated `hex_new_*` comments
Some code comments refer to hex_new_value and hex_new_pred_value, which
have been transferred to DisasContext and, in the case of hex_new_value,
should now be accessed through get_result_gpr().

In order to fix this outdated comments and also avoid having to tweak
them whenever we make a variable name change in the future, let's
replace them with pseudocode.

Suggested-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <8e1689e28dd7b1318369b55127cf47b82ab75921.1684939078.git.quic_mathbern@quicinc.com>
2023-05-26 07:03:41 -07:00
Matheus Tavares Bernardino 3608c2419c target/hexagon/*.py: clean up used 'toss' and 'numregs' vars
Many Hexagon python scripts call hex_common.get_tagregs(), but only one
call site use the full reg structure given by this function. To make the
code cleaner, let's make get_tagregs() filter out the unused fields
(i.e. 'toss' and 'numregs'), properly removed the unused variables at
the call sites. The hex_common.bad_register() function is also adjusted
to work exclusively with 'regtype' and 'regid' args. For the single call
site that does use toss/numregs, we provide an optional parameter to
get_tagregs() which will restore the old full behavior.

Suggested-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Tested-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <3ffd4ccb972879f57f499705c624e8eaba7f8b52.1684939078.git.quic_mathbern@quicinc.com>
2023-05-26 07:03:41 -07:00
Marco Liebel 3fd49e2217 Hexagon (target/hexagon) Fix assignment to tmp registers
The order in which instructions are generated by gen_insn() influences
assignment to tmp registers. During generation, tmp instructions (e.g.
generate_V6_vassign_tmp) use vreg_src_off() to determine what kind of
register to use as source. If some instruction (e.g.
generate_V6_vmpyowh_64_acc) uses a tmp register but is generated prior
to the corresponding tmp instruction, the vregs_updated_tmp bit map
isn't updated in time.

Exmple:
    { v14.tmp = v16; v25 = v14 } This works properly because
    generate_V6_vassign_tmp is generated before generate_V6_vassign
    and the bit map is updated.

    { v15:14.tmp = vcombine(v21, v16); v25:24 += vmpyo(v18.w,v14.h) }
    This does not work properly because vmpyo is generated before
    vcombine and therefore the bit map does not yet know that there's
    a tmp register.

The parentheses in the decoding function were in the wrong place.
Moving them to the correct location makes shuffling of .tmp vector
registers work as expected.

Signed-off-by: Marco Liebel <quic_mliebel@quicinc.com>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Tested-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <20230522174708.464197-1-quic_mliebel@quicinc.com>
2023-05-26 07:03:41 -07:00
Taylor Simpson b647652ee5 Hexagon (gdbstub): add HVX support
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Co-authored-by: Brian Cain <bcain@quicinc.com>
Signed-off-by: Brian Cain <bcain@quicinc.com>
Co-authored-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Message-Id: <17cb32f34d469f705c3cc066a3583935352ee048.1683214375.git.quic_mathbern@quicinc.com>
2023-05-18 12:40:52 -07:00
Brian Cain b0bd9d8adf Hexagon (gdbstub): fix p3:0 read and write via stub
Signed-off-by: Brian Cain <bcain@quicinc.com>
Co-authored-by: Sid Manning <sidneym@quicinc.com>
Signed-off-by: Sid Manning <sidneym@quicinc.com>
Co-authored-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <32e7de567cdae184a6781644454bbb19916c955b.1683214375.git.quic_mathbern@quicinc.com>
2023-05-18 12:40:52 -07:00
Matheus Tavares Bernardino ab930e8009 Hexagon: add core gdbstub xml data for LLDB
Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <d25a3a79334d81f0e1ecfb438b6ee82585d02dc4.1683214375.git.quic_mathbern@quicinc.com>
2023-05-18 12:40:52 -07:00
Matheus Tavares Bernardino 14edcf11e2 Hexagon (decode): look for pkts with multiple insns at the same slot
Each slot in a packet can be assigned to at most one instruction.
Although the assembler generally ought to enforce this rule, we better
be safe than sorry and also do some check to properly throw an "invalid
packet" exception on wrong slot assignments.

This should also make it easier to debug possible future errors caused
by missing updates to `find_iclass_slots()` rules in
target/hexagon/iclass.c.

Co-authored-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Tested-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <f8b829443523568823d062adf8bf6659bc6d4a3f.1683552984.git.quic_mathbern@quicinc.com>
2023-05-18 12:40:52 -07:00
Matheus Tavares Bernardino ed9b28fb00 Hexagon (iclass): update J4_hintjumpr slot constraints
The Hexagon PRM says that "The assembler automatically encodes
instructions in the packet in the proper order. In the binary encoding
of a packet, the instructions must be ordered from Slot 3 down to
Slot 0."

Prior to the architecture version v73, the slot constraints from
instruction "hintjr" only allowed it to be executed at slot 2.
With that in mind, consider the packet:

    {
        hintjr(r0)
        nop
        nop
        if (!p0) memd(r1+#0) = r1:0
    }

To satisfy the ordering rule quoted from the PRM, the assembler would,
thus, move one of the nops to the first position, so that it can be
assigned to slot 3 and the subsequent hintjr to slot 2.

However, since v73, hintjr can be executed at either slot 2 or 3. So
there is no need to reorder that packet and the assembler will encode it
as is. When QEMU tries to execute it, however, we end up hitting a
"misaliged store" exception because both the store and the hintjr will
be assigned to store 0, and some functions like `slot_is_predicated()`
expect the decode machinery to assign only one instruction per slot. In
particular, the mentioned function will traverse the packet until it
finds the first instruction at the desired slot which, for slot 0, will
be hintjr. Since hintjr is not predicated, the result is that we try to
execute the store regardless of the predicate. And because the predicate
is false, we had not previously loaded hex_store_addr[0] or
hex_store_width[0]. As a result, the store will decide de width based on
trash memory, causing it to be misaligned.

Update the slot constraints for hintjr so that QEMU can properly handle
such encodings.

Note: to avoid similar-but-not-identical issues in the future, we should
look for multiple instructions at the same slot during decoding time and
throw an invalid packet exception. That will be done in the subsequent
commit.

Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <0fcd8293642c6324119fbbab44741164bcbd04fb.1673616964.git.quic_mathbern@quicinc.com>
2023-05-18 12:40:52 -07:00
Matheus Tavares Bernardino f0e0c98443 Hexagon: list available CPUs with `-cpu help`
Currently, qemu-hexagon only models the v67 cpu. Nonetheless if we try
to get this information with `-cpu help`, qemu just exists with an error
code and no output. Let's correct that.

The code is basically a copy from target/alpha/cpu.h, but we strip the
"-hexagon-cpu" suffix before printing. This is to avoid confusing
situations like the following:

    $ qemu-hexagon -cpu help

    Available CPUs:
      v67-hexagon-cpu

    $ qemu-hexagon -cpu v67-hexagon-cpu ./prog

    qemu-hexagon: unable to find CPU model 'v67-hexagon-cpu'

Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Tested-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <b946e17c7e17eed9095700b54c5ead36e5d55dfa.1683225804.git.quic_mathbern@quicinc.com>
2023-05-18 12:40:52 -07:00
Matheus Tavares Bernardino c3199390c2 Hexagon (target/hexagon/*.py): raise exception on reg parsing error
Currently, the python scripts used for the hexagon building will not
abort the compilation when there is an error parsing a register. Let's
make the compilation properly fail in such cases by rasing an exception
instead of just printing a warning message, which might get lost in the
output.

This patch was generated with:

 git grep -l "Bad register" *hexagon* | \
 xargs sed -i "" -e 's/print("Bad register parse: "[, ]*\([^)]*\))/hex_common.bad_register(\1)/g'

Plus the bad_register() helper added to hex_common.py.

Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Tested-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <1f5dbd92f68fdd89e2647e4ba527a2c32cf0f070.1683217043.git.quic_mathbern@quicinc.com>
2023-05-18 12:40:52 -07:00