From: Aleksandar Markovic <aleksandar.m.mail@gmail.com>
To: Michael Rolnik <mrolnik@gmail.com>
Cc: "thuth@redhat.com" <thuth@redhat.com>,
"me@xcancerberox.com.ar" <me@xcancerberox.com.ar>,
"richard.henderson@linaro.org" <richard.henderson@linaro.org>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"dovgaluk@ispras.ru" <dovgaluk@ispras.ru>,
"imammedo@redhat.com" <imammedo@redhat.com>,
"philmd@redhat.com" <philmd@redhat.com>
Subject: Re: [PATCH v39 04/22] target/avr: Add instruction translation - Registers definition
Date: Sun, 22 Dec 2019 16:54:55 +0100 [thread overview]
Message-ID: <CAL1e-=gJyfHZhCcVxkgBawpt-R_b4Wpvb7LNCWDLGQ2r6q2JBQ@mail.gmail.com> (raw)
In-Reply-To: <20191218210329.1960-5-mrolnik@gmail.com>
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On Wednesday, December 18, 2019, Michael Rolnik <mrolnik@gmail.com> wrote:
> Signed-off-by: Michael Rolnik <mrolnik@gmail.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
> target/avr/translate.c | 143 +++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 143 insertions(+)
> create mode 100644 target/avr/translate.c
>
> diff --git a/target/avr/translate.c b/target/avr/translate.c
> new file mode 100644
> index 0000000000..0139bcabb1
> --- /dev/null
> +++ b/target/avr/translate.c
> @@ -0,0 +1,143 @@
> +/*
> + * QEMU AVR CPU
> + *
> + * Copyright (c) 2019 Michael Rolnik
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, see
> + * <http://www.gnu.org/licenses/lgpl-2.1.html>
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu/qemu-print.h"
> +#include "tcg/tcg.h"
> +#include "cpu.h"
> +#include "exec/exec-all.h"
> +#include "tcg-op.h"
> +#include "exec/cpu_ldst.h"
> +#include "exec/helper-proto.h"
> +#include "exec/helper-gen.h"
> +#include "exec/log.h"
> +#include "exec/translator.h"
> +#include "exec/gen-icount.h"
> +
> +/*
> + * Define if you want a BREAK instruction translated to a breakpoint
> + * Active debugging connection is assumed
> + * This is for
> + * https://github.com/seharris/qemu-avr-tests/tree/master/
> instruction-tests
> + * tests
> + */
> +#undef BREAKPOINT_ON_BREAK
> +
> +static TCGv cpu_pc;
> +
> +static TCGv cpu_Cf;
> +static TCGv cpu_Zf;
> +static TCGv cpu_Nf;
> +static TCGv cpu_Vf;
> +static TCGv cpu_Sf;
> +static TCGv cpu_Hf;
> +static TCGv cpu_Tf;
> +static TCGv cpu_If;
> +
> +static TCGv cpu_rampD;
> +static TCGv cpu_rampX;
> +static TCGv cpu_rampY;
> +static TCGv cpu_rampZ;
> +
> +static TCGv cpu_r[NUMBER_OF_CPU_REGISTERS];
> +static TCGv cpu_eind;
> +static TCGv cpu_sp;
> +
> +static TCGv cpu_skip;
> +
> +static const char reg_names[NUMBER_OF_CPU_REGISTERS][8] = {
> + "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
> + "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
> + "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
> + "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
> +};
> +#define REG(x) (cpu_r[x])
> +
> +enum {
> + DISAS_EXIT = DISAS_TARGET_0, /* We want return to the cpu main
> loop. */
> + DISAS_LOOKUP = DISAS_TARGET_1, /* We have a variable condition
> exit. */
> + DISAS_CHAIN = DISAS_TARGET_2, /* We have a single condition exit.
> */
> +};
> +
> +typedef struct DisasContext DisasContext;
> +
> +/* This is the state at translation time. */
> +struct DisasContext {
> + TranslationBlock *tb;
> +
> + CPUAVRState *env;
> + CPUState *cs;
> +
> + target_long npc;
> + uint32_t opcode;
> +
> + /* Routine used to access memory */
> + int memidx;
> + int bstate;
> + int singlestep;
> +
> + TCGv skip_var0;
> + TCGv skip_var1;
> + TCGCond skip_cond;
> + bool free_skip_var0;
[PATCH v36 04/17] target/avr: Add instruction translation - Registers
definition
Inbox
M
Michael Rolnik
Signed-off-by: Michael Rolnik <mrolnik@gmail.com> ---
target/avr/translate.c | 132 +++++++++++++++++++++++++++++++++++++++++ 1
file changed, 132 in...
A
Aleksandar Markovic
to Michael, QEMU, Richard, +5
Nov 26
Details
This set of four lines are by far the hardest to connect to the
documentation.
Please add before them a sizable comment with explanations for:
- the reason these variables are introduced
- why are they here (part of DisasContext)
- what other variables elsewhere in your solutiin are closely related to
these four variables
- what they affect
- summary of the way they work
Perhaps add comments to other places where "skip"-related data fields
are introduced too.
(I believe the implementation is correct, but it is extremely hard to the
reader
to reverse-engineer the intentions)
Yours, Aleksandar
Aleksa
> +};
> +
> +static int to_regs_16_31_by_one(DisasContext *ctx, int indx)
> +{
> + return 16 + (indx % 16);
> +}
> +
> +static int to_regs_16_23_by_one(DisasContext *ctx, int indx)
> +{
> + return 16 + (indx % 8);
> +}
> +static int to_regs_24_30_by_two(DisasContext *ctx, int indx)
> +{
> + return 24 + (indx % 4) * 2;
> +}
> +static int to_regs_00_30_by_two(DisasContext *ctx, int indx)
> +{
> + return (indx % 16) * 2;
> +}
> +
> +static uint16_t next_word(DisasContext *ctx)
> +{
> + return cpu_lduw_code(ctx->env, ctx->npc++ * 2);
> +}
> +
> +static int append_16(DisasContext *ctx, int x)
> +{
> + return x << 16 | next_word(ctx);
> +}
> +
> +
> +static bool avr_have_feature(DisasContext *ctx, int feature)
> +{
> + if (!avr_feature(ctx->env, feature)) {
> + gen_helper_unsupported(cpu_env);
> + ctx->bstate = DISAS_NORETURN;
> + return false;
> + }
> + return true;
> +}
> +
> +static bool decode_insn(DisasContext *ctx, uint16_t insn);
> +#include "decode_insn.inc.c"
> +
> --
> 2.17.2 (Apple Git-113)
>
>
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next prev parent reply other threads:[~2019-12-22 15:55 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-18 21:03 [PATCH v39 00/22] QEMU AVR 8 bit cores Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 01/22] target/avr: Add outward facing interfaces and core CPU logic Michael Rolnik
2019-12-21 10:53 ` Aleksandar Markovic
2019-12-21 11:22 ` Philippe Mathieu-Daudé
2019-12-21 12:32 ` Aleksandar Markovic
2019-12-18 21:03 ` [PATCH v39 02/22] target/avr: Add instruction helpers Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 03/22] target/avr: Add instruction decoding Michael Rolnik
2019-12-21 11:18 ` Aleksandar Markovic
2019-12-21 15:57 ` Michael Rolnik
2019-12-21 16:21 ` Aleksandar Markovic
2019-12-21 17:15 ` Aleksandar Markovic
2019-12-28 19:31 ` Michael Rolnik
2019-12-29 14:37 ` Aleksandar Markovic
2019-12-18 21:03 ` [PATCH v39 04/22] target/avr: Add instruction translation - Registers definition Michael Rolnik
2019-12-22 15:54 ` Aleksandar Markovic [this message]
2019-12-18 21:03 ` [PATCH v39 05/22] target/avr: Add instruction translation - Arithmetic and Logic Instructions Michael Rolnik
2019-12-22 15:41 ` Aleksandar Markovic
2019-12-18 21:03 ` [PATCH v39 06/22] target/avr: Add instruction translation - Branch Instructions Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 07/22] target/avr: Add instruction translation - Data Transfer Instructions Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 08/22] target/avr: Add instruction translation - Bit and Bit-test Instructions Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 09/22] target/avr: Add instruction translation - MCU Control Instructions Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 10/22] target/avr: Add instruction translation - CPU main translation function Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 11/22] target/avr: Add instruction disassembly function Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 12/22] target/avr: Add limited support for USART peripheral Michael Rolnik
2019-12-20 15:56 ` Philippe Mathieu-Daudé
2019-12-18 21:03 ` [PATCH v39 13/22] target/avr: Add limited support for 16 bit timer peripheral Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 14/22] target/avr: Add dummy mask device Michael Rolnik
2019-12-23 8:46 ` Aleksandar Markovic
2019-12-28 18:52 ` Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 15/22] target/avr: Add example board configuration Michael Rolnik
2019-12-20 9:51 ` Igor Mammedov
2019-12-20 12:30 ` Michael Rolnik
2019-12-20 15:18 ` Igor Mammedov
2019-12-20 23:12 ` Philippe Mathieu-Daudé
2020-01-21 21:32 ` Philippe Mathieu-Daudé
2019-12-18 21:03 ` [PATCH v39 16/22] target/avr: Add section about AVR into QEMU documentation Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 17/22] target/avr: Register AVR support with the rest of QEMU Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 18/22] target/avr: Add machine none test Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 19/22] target/avr: Update build system Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 20/22] target/avr: Add boot serial test Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 21/22] target/avr: Add Avocado test Michael Rolnik
2019-12-18 21:03 ` [PATCH v39 22/22] target/avr: Update MAINTAINERS file Michael Rolnik
2019-12-23 8:56 ` Aleksandar Markovic
2019-12-23 9:13 ` [PATCH v39 00/22] QEMU AVR 8 bit cores Aleksandar Markovic
2019-12-28 18:01 ` Michael Rolnik
2019-12-28 19:38 ` Aleksandar Markovic
2019-12-28 20:00 ` Michael Rolnik
2019-12-29 14:19 ` Aleksandar Markovic
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