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[209.51.188.17]) by mx.google.com with ESMTPS id 203si4179674qkk.112.2021.07.08.21.48.07 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Thu, 08 Jul 2021 21:48:07 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b=O+n0AfHS; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:54354 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m1iQp-00056d-3D for patch@linaro.org; Fri, 09 Jul 2021 00:48:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53862) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1i5v-0006J3-PJ for qemu-devel@nongnu.org; Fri, 09 Jul 2021 00:26:31 -0400 Received: from mail-pg1-x530.google.com ([2607:f8b0:4864:20::530]:43898) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1m1i5h-0001Vt-A8 for qemu-devel@nongnu.org; Fri, 09 Jul 2021 00:26:31 -0400 Received: by mail-pg1-x530.google.com with SMTP id y4so6210025pgl.10 for ; Thu, 08 Jul 2021 21:26:15 -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=ErWpHWjhjt0JpP+PFb2nQDuBLTGa4sotp1ACko/W4m0=; b=O+n0AfHSm4xa2yKXRgaW+y3NnwZ60dRW5PDDv4Zqb5d9MpgZQ/bnyeKtaCHjZvUOT2 PaGorBZq7WbndvYLMh5/kDh9R4jO3j3u3c354mjGX5lACw968VfZpDtfn1Bcv+2Ac5E0 A3O5pXi3WJ2HH+uE41jP1Iu4p4MytMB4uIsxzTNPlbS2gjF/62hSCWXN3Jtg+RLM1ySa fje13Ba1VVT4v6eAKVp9AABIev+zxBHQ5x6pl9KThWx7uJmDcdwjB0RNcU6Pm8DHlKgP iAihwi5UqXRNZAKWPBSIQzOb280bEker+6S+/Qoc8Gwsyujnm+Oc4n3KylhCsgRtsdEM bmpw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ErWpHWjhjt0JpP+PFb2nQDuBLTGa4sotp1ACko/W4m0=; b=RlnJadJ7nNOhelsicoy809IchQ8Qb7kAyNBc6/yUxV1dbzlMQzWap0aL75OzEIOdSn ydrRplV3eRWbWCvZR/+5haX5BQX1YyQ1x/JYuJTf5qIAMF+M+VxRUsh9+B/EGL2xd0gs 9ioIHb31VP4z8cbccx/qFeVtWO9QEvPZYOSAglzM+uJ1b/VblaHFbERJOdFyOfiE1W42 WuNy7N931tg9vuf6Seurql8pIIIlv4DzGgYkU4SG69QlI7CBAIC5JS6XCnqIapPQN2S9 8w4nmZac3uTtcBNjwf04SGnao3R591EBygNPconnBc0wnLjFrRmP1Dmo/djwigLecY04 lR3w== X-Gm-Message-State: AOAM530vY0pEKlgF8PyV1adEQm5ayMPU0jlo76sqfwxOSPQx7LZnuFIj yZEldNeR5+CR79sHaWavszPqLJ9hN6g2dg== X-Received: by 2002:a65:684d:: with SMTP id q13mr29189282pgt.163.1625804775099; Thu, 08 Jul 2021 21:26:15 -0700 (PDT) Received: from localhost.localdomain ([71.212.149.176]) by smtp.gmail.com with ESMTPSA id y16sm4406727pfe.70.2021.07.08.21.26.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jul 2021 21:26:14 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 09/17] target/riscv: Reorg csr instructions Date: Thu, 8 Jul 2021 21:26:00 -0700 Message-Id: <20210709042608.883256-10-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210709042608.883256-1-richard.henderson@linaro.org> References: <20210709042608.883256-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::530; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x530.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 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alistair.francis@wdc.com, qemu-riscv@nongnu.org Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" Introduce csrr and csrw helpers, for read-only and write-only insns. Note that we do not properly implement this in riscv_csrrw, in that we cannot distinguish true read-only (rs1 == 0) from any other zero write_mask another source register -- this should still raise an exception for read-only registers. Only issue gen_io_start for CF_USE_ICOUNT. Use ctx->zero for csrrc. Signed-off-by: Richard Henderson --- target/riscv/helper.h | 6 +- target/riscv/op_helper.c | 18 +-- target/riscv/insn_trans/trans_rvi.c.inc | 170 +++++++++++++++++------- 3 files changed, 129 insertions(+), 65 deletions(-) -- 2.25.1 Reviewed-by: Alistair Francis diff --git a/target/riscv/helper.h b/target/riscv/helper.h index 415e37bc37..460eee9988 100644 --- a/target/riscv/helper.h +++ b/target/riscv/helper.h @@ -65,9 +65,9 @@ DEF_HELPER_FLAGS_2(gorc, TCG_CALL_NO_RWG_SE, tl, tl, tl) DEF_HELPER_FLAGS_2(gorcw, TCG_CALL_NO_RWG_SE, tl, tl, tl) /* Special functions */ -DEF_HELPER_3(csrrw, tl, env, tl, tl) -DEF_HELPER_4(csrrs, tl, env, tl, tl, tl) -DEF_HELPER_4(csrrc, tl, env, tl, tl, tl) +DEF_HELPER_2(csrr, tl, env, int) +DEF_HELPER_3(csrw, void, env, int, tl) +DEF_HELPER_4(csrrw, tl, env, int, tl, tl) #ifndef CONFIG_USER_ONLY DEF_HELPER_2(sret, tl, env, tl) DEF_HELPER_2(mret, tl, env, tl) diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c index 3c48e739ac..ee7c24efe7 100644 --- a/target/riscv/op_helper.c +++ b/target/riscv/op_helper.c @@ -37,11 +37,10 @@ void helper_raise_exception(CPURISCVState *env, uint32_t exception) riscv_raise_exception(env, exception, 0); } -target_ulong helper_csrrw(CPURISCVState *env, target_ulong src, - target_ulong csr) +target_ulong helper_csrr(CPURISCVState *env, int csr) { target_ulong val = 0; - RISCVException ret = riscv_csrrw(env, csr, &val, src, -1); + RISCVException ret = riscv_csrrw(env, csr, &val, 0, 0); if (ret != RISCV_EXCP_NONE) { riscv_raise_exception(env, ret, GETPC()); @@ -49,23 +48,20 @@ target_ulong helper_csrrw(CPURISCVState *env, target_ulong src, return val; } -target_ulong helper_csrrs(CPURISCVState *env, target_ulong src, - target_ulong csr, target_ulong rs1_pass) +void helper_csrw(CPURISCVState *env, int csr, target_ulong src) { - target_ulong val = 0; - RISCVException ret = riscv_csrrw(env, csr, &val, -1, rs1_pass ? src : 0); + RISCVException ret = riscv_csrrw(env, csr, NULL, src, -1); if (ret != RISCV_EXCP_NONE) { riscv_raise_exception(env, ret, GETPC()); } - return val; } -target_ulong helper_csrrc(CPURISCVState *env, target_ulong src, - target_ulong csr, target_ulong rs1_pass) +target_ulong helper_csrrw(CPURISCVState *env, int csr, + target_ulong src, target_ulong write_mask) { target_ulong val = 0; - RISCVException ret = riscv_csrrw(env, csr, &val, 0, rs1_pass ? src : 0); + RISCVException ret = riscv_csrrw(env, csr, &val, src, write_mask); if (ret != RISCV_EXCP_NONE) { riscv_raise_exception(env, ret, GETPC()); diff --git a/target/riscv/insn_trans/trans_rvi.c.inc b/target/riscv/insn_trans/trans_rvi.c.inc index 840187a4d6..3705aad380 100644 --- a/target/riscv/insn_trans/trans_rvi.c.inc +++ b/target/riscv/insn_trans/trans_rvi.c.inc @@ -452,80 +452,148 @@ static bool trans_fence_i(DisasContext *ctx, arg_fence_i *a) return true; } -#define RISCV_OP_CSR_PRE do {\ - source1 = tcg_temp_new(); \ - csr_store = tcg_temp_new(); \ - dest = tcg_temp_new(); \ - rs1_pass = tcg_temp_new(); \ - gen_get_gpr(source1, a->rs1); \ - tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next); \ - tcg_gen_movi_tl(rs1_pass, a->rs1); \ - tcg_gen_movi_tl(csr_store, a->csr); \ - gen_io_start();\ -} while (0) +static bool do_csr_post(DisasContext *ctx) +{ + /* We may have changed important cpu state -- exit to main loop. */ + tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn); + exit_tb(ctx); + ctx->base.is_jmp = DISAS_NORETURN; + return true; +} -#define RISCV_OP_CSR_POST do {\ - gen_set_gpr(a->rd, dest); \ - tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn); \ - exit_tb(ctx); \ - ctx->base.is_jmp = DISAS_NORETURN; \ - tcg_temp_free(source1); \ - tcg_temp_free(csr_store); \ - tcg_temp_free(dest); \ - tcg_temp_free(rs1_pass); \ -} while (0) +static bool do_csrr(DisasContext *ctx, int rd, int rc) +{ + TCGv dest = gpr_dst(ctx, rd); + TCGv_i32 csr = tcg_constant_i32(rc); + if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) { + gen_io_start(); + } + gen_helper_csrr(dest, cpu_env, csr); + return do_csr_post(ctx); +} + +static bool do_csrw(DisasContext *ctx, int rc, TCGv src) +{ + TCGv_i32 csr = tcg_constant_i32(rc); + + if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) { + gen_io_start(); + } + gen_helper_csrw(cpu_env, csr, src); + return do_csr_post(ctx); +} + +static bool do_csrrw(DisasContext *ctx, int rd, int rc, TCGv src, TCGv mask) +{ + TCGv dest = gpr_dst(ctx, rd); + TCGv_i32 csr = tcg_constant_i32(rc); + + if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) { + gen_io_start(); + } + gen_helper_csrrw(dest, cpu_env, csr, src, mask); + return do_csr_post(ctx); +} static bool trans_csrrw(DisasContext *ctx, arg_csrrw *a) { - TCGv source1, csr_store, dest, rs1_pass; - RISCV_OP_CSR_PRE; - gen_helper_csrrw(dest, cpu_env, source1, csr_store); - RISCV_OP_CSR_POST; - return true; + TCGv src = gpr_src(ctx, a->rs1); + + /* + * If rd == 0, the insn shall not read the csr, nor cause any of the + * side effects that might occur on a csr read. + */ + if (a->rd == 0) { + return do_csrw(ctx, a->csr, src); + } + + TCGv mask = tcg_constant_tl(-1); + return do_csrrw(ctx, a->rd, a->csr, src, mask); } static bool trans_csrrs(DisasContext *ctx, arg_csrrs *a) { - TCGv source1, csr_store, dest, rs1_pass; - RISCV_OP_CSR_PRE; - gen_helper_csrrs(dest, cpu_env, source1, csr_store, rs1_pass); - RISCV_OP_CSR_POST; - return true; + /* + * If rs1 == 0, the insn shall not write to the csr at all, nor + * cause any of the side effects that might occur on a csr write. + * Note that if rs1 specifies a register other than x0, holding + * a zero value, the instruction will still attempt to write the + * unmodified value back to the csr and will cause side effects. + */ + if (a->rs1 == 0) { + return do_csrr(ctx, a->rd, a->csr); + } + + TCGv ones = tcg_constant_tl(-1); + TCGv mask = gpr_src(ctx, a->rs1); + return do_csrrw(ctx, a->rd, a->csr, ones, mask); } static bool trans_csrrc(DisasContext *ctx, arg_csrrc *a) { - TCGv source1, csr_store, dest, rs1_pass; - RISCV_OP_CSR_PRE; - gen_helper_csrrc(dest, cpu_env, source1, csr_store, rs1_pass); - RISCV_OP_CSR_POST; - return true; + /* + * If rs1 == 0, the insn shall not write to the csr at all, nor + * cause any of the side effects that might occur on a csr write. + * Note that if rs1 specifies a register other than x0, holding + * a zero value, the instruction will still attempt to write the + * unmodified value back to the csr and will cause side effects. + */ + if (a->rs1 == 0) { + return do_csrr(ctx, a->rd, a->csr); + } + + TCGv mask = gpr_src(ctx, a->rs1); + return do_csrrw(ctx, a->rd, a->csr, ctx->zero, mask); } static bool trans_csrrwi(DisasContext *ctx, arg_csrrwi *a) { - TCGv source1, csr_store, dest, rs1_pass; - RISCV_OP_CSR_PRE; - gen_helper_csrrw(dest, cpu_env, rs1_pass, csr_store); - RISCV_OP_CSR_POST; - return true; + TCGv src = tcg_constant_tl(a->rs1); + + /* + * If rd == 0, the insn shall not read the csr, nor cause any of the + * side effects that might occur on a csr read. + */ + if (a->rd == 0) { + return do_csrw(ctx, a->csr, src); + } + + TCGv mask = tcg_constant_tl(-1); + return do_csrrw(ctx, a->rd, a->csr, src, mask); } static bool trans_csrrsi(DisasContext *ctx, arg_csrrsi *a) { - TCGv source1, csr_store, dest, rs1_pass; - RISCV_OP_CSR_PRE; - gen_helper_csrrs(dest, cpu_env, rs1_pass, csr_store, rs1_pass); - RISCV_OP_CSR_POST; - return true; + /* + * If rs1 == 0, the insn shall not write to the csr at all, nor + * cause any of the side effects that might occur on a csr write. + * Note that if rs1 specifies a register other than x0, holding + * a zero value, the instruction will still attempt to write the + * unmodified value back to the csr and will cause side effects. + */ + if (a->rs1 == 0) { + return do_csrr(ctx, a->rd, a->csr); + } + + TCGv ones = tcg_constant_tl(-1); + TCGv mask = tcg_constant_tl(a->rs1); + return do_csrrw(ctx, a->rd, a->csr, ones, mask); } static bool trans_csrrci(DisasContext *ctx, arg_csrrci *a) { - TCGv source1, csr_store, dest, rs1_pass; - RISCV_OP_CSR_PRE; - gen_helper_csrrc(dest, cpu_env, rs1_pass, csr_store, rs1_pass); - RISCV_OP_CSR_POST; - return true; + /* + * If rs1 == 0, the insn shall not write to the csr at all, nor + * cause any of the side effects that might occur on a csr write. + * Note that if rs1 specifies a register other than x0, holding + * a zero value, the instruction will still attempt to write the + * unmodified value back to the csr and will cause side effects. + */ + if (a->rs1 == 0) { + return do_csrr(ctx, a->rd, a->csr); + } + + TCGv mask = tcg_constant_tl(a->rs1); + return do_csrrw(ctx, a->rd, a->csr, ctx->zero, mask); }