From: Michael Rolnik <mrol...@gmail.com> Start implementation of instructions by adding register definitions.
Signed-off-by: Michael Rolnik <mrol...@gmail.com> Signed-off-by: Richard Henderson <richard.hender...@linaro.org> Signed-off-by: Aleksandar Markovic <aleksandar.m.m...@gmail.com> Tested-by: Philippe Mathieu-Daudé <phi...@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com> Reviewed-by: Aleksandar Markovic <aleksandar.m.m...@gmail.com> Signed-off-by: Thomas Huth <h...@tuxfamily.org> --- 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..44ee8849f0 --- /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/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; + + /* + * some AVR instructions can make the following instruction to be skipped + * Let's name those instructions + * A - instruction that can skip the next one + * B - instruction that can be skipped. this depends on execution of A + * there are two scenarios + * 1. A and B belong to the same translation block + * 2. A is the last instruction in the translation block and B is the last + * + * following variables are used to simplify the skipping logic, they are + * used in the following manner (sketch) + * + * TCGLabel *skip_label = NULL; + * if (ctx.skip_cond != TCG_COND_NEVER) { + * skip_label = gen_new_label(); + * tcg_gen_brcond_tl(skip_cond, skip_var0, skip_var1, skip_label); + * } + * + * if (free_skip_var0) { + * tcg_temp_free(skip_var0); + * free_skip_var0 = false; + * } + * + * translate(&ctx); + * + * if (skip_label) { + * gen_set_label(skip_label); + * } + */ + TCGv skip_var0; + TCGv skip_var1; + TCGCond skip_cond; + bool free_skip_var0; +}; + + +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" -- 2.26.2
