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[174.21.142.130]) by smtp.gmail.com with ESMTPSA id k187-20020a636fc4000000b003983a01b896sm13585053pgc.90.2022.04.26.11.22.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Apr 2022 11:22:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=EjEvoq47mgxbhwOkPjY+lzICTw8tSYJC5nzrZvKsO9E=; b=eUEwaLrbr0Gb8Ot2KghReSEr6GonJrQlWYyYTbuJGg7PYv4IE8KvHQkRCgy6tSep8e 3jVXLQQIpxgqTZI67uP6u9UHwreMmBj6rJRqXqoyelPcbY7PM/3WtvUO4OXPAyrVPQhF 4f2Fa//1P4wVvGnKfJN7ma6CNNM62ZZzTsOuxjbxnAOMgOlj1pTQ31U5sL51cYr5xe6q FJwp7KleYGV1e+0do+3HJyNXLpehDUDDX8rf8rtFhWnro0mbvDV4mVyaWPcHtQIqcLU2 GtDRLh9btaxrNVyKtbpoG1tj2t++SzzJKHsil2j1xsUmUW869S5H3X2Nz/aetabps/ah LuWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=EjEvoq47mgxbhwOkPjY+lzICTw8tSYJC5nzrZvKsO9E=; b=16DuyG8dSSB0faM/AOiz0iGPqyWKmJ/l/FYYcfU/1KbYeJibCzCrjsm/0thWQtDjre 0uI6uhwUPQWft6UXhAeCqcFO+xfbVt3yrYMK9W2F4CX2LuzWWxoJt9QFH1EGWnrpowZo t8kxNsxNisg569QLhLTMrZ1JN84AvFN1wpvrVAoI7eq2VS9bIoU64kgrP7B9U0mb4r4V WLs5Vr3p3vMzthyckTGibPE7d5T60l9CId2PYd7gWyd7wsdhvQzICMyJBJgi1klRe93S A0DO2fEt6w7zM5yvtnBhEoq/phtCJhlB5SWrbITPsdYLiX+HnxgxvPYbj3rYGf1DObXb t91Q== X-Gm-Message-State: AOAM533jmEhfDzSB1G0qUwKuYsG6KGifK0uAKDtGZkwhvx15VSSqI1n+ 8wE4L4A27VqhJQvPxS+qrWpUUnX+M8VWHw== X-Google-Smtp-Source: ABdhPJzezMrExOVyPz64mn0rHOwgy878TZdV5DHj5e8+k9x98I5AUrTv2hk1CrlQDzwqrGdgUyFarw== X-Received: by 2002:a17:902:eb91:b0:15d:1f88:d993 with SMTP id q17-20020a170902eb9100b0015d1f88d993mr9128891plg.17.1650997379656; Tue, 26 Apr 2022 11:22:59 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PULL 56/68] target/nios2: Implement Misaligned destination exception Date: Tue, 26 Apr 2022 11:18:55 -0700 Message-Id: <20220426181907.103691-57-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220426181907.103691-1-richard.henderson@linaro.org> References: <20220426181907.103691-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::630; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x630.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1650999616857100001 Content-Type: text/plain; charset="utf-8" Indirect branches, plus eret and bret optionally raise an exception when branching to a misaligned address. The exception is required when an mmu is enabled, but enable it always because the fallback behaviour is not documented (though presumably it discards low bits). For the purposes of the linux-user cpu loop, if EXCP_UNALIGN (misaligned data) were to arrive, it would be treated the same as EXCP_UNALIGND (misaligned destination). See the !defined(CONFIG_NIOS2_ALIGNMENT_TRAP) block in kernel/traps.c. Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson Message-Id: <20220421151735.31996-53-richard.henderson@linaro.org> --- linux-user/nios2/cpu_loop.c | 6 ++++++ target/nios2/op_helper.c | 9 ++++++++- target/nios2/translate.c | 15 ++++++++++++++- 3 files changed, 28 insertions(+), 2 deletions(-) diff --git a/linux-user/nios2/cpu_loop.c b/linux-user/nios2/cpu_loop.c index 11ecb71843..30a27f252b 100644 --- a/linux-user/nios2/cpu_loop.c +++ b/linux-user/nios2/cpu_loop.c @@ -42,6 +42,12 @@ void cpu_loop(CPUNios2State *env) force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->pc); break; =20 + case EXCP_UNALIGN: + case EXCP_UNALIGND: + force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, + env->ctrl[CR_BADADDR]); + break; + case EXCP_TRAP: /* * TODO: This advance should be done in the translator, as diff --git a/target/nios2/op_helper.c b/target/nios2/op_helper.c index a19b504b0e..38a71a1f2d 100644 --- a/target/nios2/op_helper.c +++ b/target/nios2/op_helper.c @@ -64,6 +64,13 @@ uint32_t helper_divu(CPUNios2State *env, uint32_t num, u= int32_t den) void helper_eret(CPUNios2State *env, uint32_t new_status, uint32_t new_pc) { Nios2CPU *cpu =3D env_archcpu(env); + CPUState *cs =3D env_cpu(env); + + if (unlikely(new_pc & 3)) { + env->ctrl[CR_BADADDR] =3D new_pc; + cs->exception_index =3D EXCP_UNALIGND; + cpu_loop_exit_restore(cs, GETPC()); + } =20 /* * Both estatus and bstatus have no constraints on write; @@ -74,6 +81,6 @@ void helper_eret(CPUNios2State *env, uint32_t new_status,= uint32_t new_pc) =20 env->ctrl[CR_STATUS] =3D new_status; env->pc =3D new_pc; - cpu_loop_exit(env_cpu(env)); + cpu_loop_exit(cs); } #endif /* !CONFIG_USER_ONLY */ diff --git a/target/nios2/translate.c b/target/nios2/translate.c index a3e87beba4..794b763d8a 100644 --- a/target/nios2/translate.c +++ b/target/nios2/translate.c @@ -197,11 +197,24 @@ static void gen_goto_tb(DisasContext *dc, int n, uint= 32_t dest) =20 static void gen_jumpr(DisasContext *dc, int regno, bool is_call) { - tcg_gen_mov_tl(cpu_pc, load_gpr(dc, regno)); + TCGLabel *l =3D gen_new_label(); + TCGv test =3D tcg_temp_new(); + TCGv dest =3D load_gpr(dc, regno); + + tcg_gen_andi_tl(test, dest, 3); + tcg_gen_brcondi_tl(TCG_COND_NE, test, 0, l); + tcg_temp_free(test); + + tcg_gen_mov_tl(cpu_pc, dest); if (is_call) { tcg_gen_movi_tl(dest_gpr(dc, R_RA), dc->base.pc_next); } tcg_gen_lookup_and_goto_ptr(); + + gen_set_label(l); + tcg_gen_st_tl(dest, cpu_env, offsetof(CPUNios2State, ctrl[CR_BADADDR])= ); + t_gen_helper_raise_exception(dc, EXCP_UNALIGND); + dc->base.is_jmp =3D DISAS_NORETURN; } =20 --=20 2.34.1