From patchwork Wed Aug 7 00:06:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak Gupta X-Patchwork-Id: 13755519 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3C7E2C52D6F for ; Wed, 7 Aug 2024 00:08:31 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sbUDx-0006XY-Ki; Tue, 06 Aug 2024 20:08:18 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sbUD4-000319-3o for qemu-devel@nongnu.org; Tue, 06 Aug 2024 20:07:23 -0400 Received: from mail-pl1-x62d.google.com ([2607:f8b0:4864:20::62d]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1sbUCx-0001CK-AD for qemu-devel@nongnu.org; Tue, 06 Aug 2024 20:07:21 -0400 Received: by mail-pl1-x62d.google.com with SMTP id d9443c01a7336-1fd90c2fc68so11857405ad.1 for ; Tue, 06 Aug 2024 17:07:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1722989231; x=1723594031; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=ZFHEY1HL0A7dkX+2//5U6cJ4axaqUQXdv3Ozs813Dsg=; b=NNZwgj1gCtLbVs7PJNJgENv05eJpuaD8J/pwUuSdwYM/R9POB6g9R/STT5rhyXfD3t hAf1zgtHzCefH/ghFmi3W4R/VbtBVUmANUkFy1W1iwnYMXpwlNgPKO6/Z8P332URWZ5A e/OQKPPtzC7q2Z1q9POpyaPUNC9sWoDG1MV9dYEZFQ9gql4GAoXNujzOpCYpxXGjGuQ0 b2El8QJwecNuoCZ73QL1YNXKT/fP9iqDo4D4J1NKnAOGUJ5TUQ7g/Iwst7rWxJchCUI0 tu8c3hVy4QvSd5aYlaOByDFetuGtUw+XA4FXlRiPGBv4lFryR7KcfOh4hxqa4ufVumbo eA0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722989231; x=1723594031; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ZFHEY1HL0A7dkX+2//5U6cJ4axaqUQXdv3Ozs813Dsg=; b=eKu6cjlNK1WUtLKyKqZjH1f2TjUkp0kjhS5+7WgGmfge9BGRzAUXEWJNNGqjcRAM89 E/6X48fC6dcVVuHL2m0lg5Mt+HdAi5HA1qDCb36UxvWf/FW96Pjl1lg3RDZ//ugRZ7Ts pXa8eQsp410FSW2qaVxilh6DMhMferK+VMoxdWj4rYcloC1iVkFb90D1fh3fTLVL9/d5 VbY42Lm+K0m6l5ud8iJmxw0pkLWBh7c3TFuCwwrsBnzppCeKhi7llpBhuUnEyXm1LU9c JC4/bQbZThSnakK+ukZaicpHnEF2U4gByojMz6GGtwktculQ4mvGBf+G8dS2igy6GvrX cD1A== X-Gm-Message-State: AOJu0YxiCVm5k0tVBpmRhZZt7C/XLOR9ghnEqkEFgDrDzb2PONeTM3dY 31AE8lsW5O3wuJ9NCE6h5etShlurDAH2b7Fe7izUZW9E/3JzIzNhqWDZiSBs7XFUCz2fwptv6CL n X-Google-Smtp-Source: AGHT+IFclzCNb3eEB5r/7Rn4jNMrRkaMIr0LSGeSyQabYhqeORwYv5ccS3f3he2rlWU+uexyDiww4Q== X-Received: by 2002:a17:903:41cf:b0:1fc:6a13:a394 with SMTP id d9443c01a7336-1ff57292c0dmr193128665ad.23.1722989230983; Tue, 06 Aug 2024 17:07:10 -0700 (PDT) Received: from debug.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1ff58f59cc2sm93381845ad.92.2024.08.06.17.07.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Aug 2024 17:07:10 -0700 (PDT) From: Deepak Gupta To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org Cc: richard.henderson@linaro.org, pbonzini@redhat.com, palmer@dabbelt.com, Alistair.Francis@wdc.com, laurent@vivier.eu, bmeng.cn@gmail.com, liwei1518@gmail.com, dbarboza@ventanamicro.com, zhiwei_liu@linux.alibaba.com, Deepak Gupta , Jim Shu , Andy Chiu Subject: [PATCH v3 12/20] target/riscv: implement zicfiss instructions Date: Tue, 6 Aug 2024 17:06:43 -0700 Message-ID: <20240807000652.1417776-13-debug@rivosinc.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240807000652.1417776-1-debug@rivosinc.com> References: <20240807000652.1417776-1-debug@rivosinc.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::62d; envelope-from=debug@rivosinc.com; helo=mail-pl1-x62d.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org zicfiss has following instructions - sspopchk: pops a value from shadow stack and compares with x1/x5. If they dont match, reports a sw check exception with tval = 3. - sspush: pushes value in x1/x5 on shadow stack - ssrdp: reads current shadow stack - ssamoswap: swaps contents of shadow stack atomically sspopchk/sspush/ssrdp default to zimop if zimop implemented and SSE=0 If SSE=0, ssamoswap is illegal instruction exception. This patch implements shadow stack operations for qemu-user and shadow stack is not protected. Signed-off-by: Deepak Gupta Co-developed-by: Jim Shu Co-developed-by: Andy Chiu --- target/riscv/cpu_bits.h | 2 + target/riscv/insn32.decode | 17 +- target/riscv/insn_trans/trans_rva.c.inc | 47 ++++++ target/riscv/insn_trans/trans_rvzicfiss.c.inc | 149 ++++++++++++++++++ target/riscv/translate.c | 1 + 5 files changed, 214 insertions(+), 2 deletions(-) create mode 100644 target/riscv/insn_trans/trans_rvzicfiss.c.inc diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h index 226157896d..5ebc4dd5b3 100644 --- a/target/riscv/cpu_bits.h +++ b/target/riscv/cpu_bits.h @@ -702,6 +702,8 @@ typedef enum RISCVException { /* zicfilp defines lp violation results in sw check with tval = 2*/ #define RISCV_EXCP_SW_CHECK_FCFI_TVAL 2 +/* zicfiss defines ss violation results in sw check with tval = 3*/ +#define RISCV_EXCP_SW_CHECK_BCFI_TVAL 3 #define RISCV_EXCP_INT_FLAG 0x80000000 #define RISCV_EXCP_INT_MASK 0x7fffffff diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode index c963c59c8e..c59c992ce2 100644 --- a/target/riscv/insn32.decode +++ b/target/riscv/insn32.decode @@ -65,8 +65,10 @@ # Formats 32: @r ....... ..... ..... ... ..... ....... &r %rs2 %rs1 %rd @i ............ ..... ... ..... ....... &i imm=%imm_i %rs1 %rd +@ss_pop ............ ..... ... ..... ....... &i imm=0 %rs1 rd=0 @b ....... ..... ..... ... ..... ....... &b imm=%imm_b %rs2 %rs1 @s ....... ..... ..... ... ..... ....... &s imm=%imm_s %rs2 %rs1 +@ss_push ....... ..... ..... ... ..... ....... &s imm=0 %rs2 rs1=0 @u .................... ..... ....... &u imm=%imm_u %rd @j .................... ..... ....... &j imm=%imm_j %rd @@ -247,6 +249,7 @@ remud 0000001 ..... ..... 111 ..... 1111011 @r lr_w 00010 . . 00000 ..... 010 ..... 0101111 @atom_ld sc_w 00011 . . ..... ..... 010 ..... 0101111 @atom_st amoswap_w 00001 . . ..... ..... 010 ..... 0101111 @atom_st +ssamoswap_w 01001 . . ..... ..... 010 ..... 0101111 @atom_st amoadd_w 00000 . . ..... ..... 010 ..... 0101111 @atom_st amoxor_w 00100 . . ..... ..... 010 ..... 0101111 @atom_st amoand_w 01100 . . ..... ..... 010 ..... 0101111 @atom_st @@ -260,6 +263,7 @@ amomaxu_w 11100 . . ..... ..... 010 ..... 0101111 @atom_st lr_d 00010 . . 00000 ..... 011 ..... 0101111 @atom_ld sc_d 00011 . . ..... ..... 011 ..... 0101111 @atom_st amoswap_d 00001 . . ..... ..... 011 ..... 0101111 @atom_st +ssamoswap_d 01001 . . ..... ..... 011 ..... 0101111 @atom_st amoadd_d 00000 . . ..... ..... 011 ..... 0101111 @atom_st amoxor_d 00100 . . ..... ..... 011 ..... 0101111 @atom_st amoand_d 01100 . . ..... ..... 011 ..... 0101111 @atom_st @@ -1023,8 +1027,17 @@ amocas_d 00101 . . ..... ..... 011 ..... 0101111 @atom_st amocas_q 00101 . . ..... ..... 100 ..... 0101111 @atom_st # *** Zimop may-be-operation extension *** -mop_r_n 1 . 00 .. 0111 .. ..... 100 ..... 1110011 @mop5 -mop_rr_n 1 . 00 .. 1 ..... ..... 100 ..... 1110011 @mop3 +{ + # zicfiss instructions carved out of mop.r + ssrdp 1100110 11100 00000 100 ..... 1110011 %rd + sspopchk 1100110 11100 ..... 100 00000 1110011 @ss_pop + mop_r_n 1 . 00 .. 0111 .. ..... 100 ..... 1110011 @mop5 +} +{ + # zicfiss instruction carved out of mop.rr + sspush 1100111 ..... 00000 100 00000 1110011 @ss_push + mop_rr_n 1 . 00 .. 1 ..... ..... 100 ..... 1110011 @mop3 +} # *** Zabhb Standard Extension *** amoswap_b 00001 . . ..... ..... 000 ..... 0101111 @atom_st diff --git a/target/riscv/insn_trans/trans_rva.c.inc b/target/riscv/insn_trans/trans_rva.c.inc index 39bbf60f3c..db6c03f6a8 100644 --- a/target/riscv/insn_trans/trans_rva.c.inc +++ b/target/riscv/insn_trans/trans_rva.c.inc @@ -18,6 +18,8 @@ * this program. If not, see . */ +#include "exec/memop.h" + #define REQUIRE_A_OR_ZAAMO(ctx) do { \ if (!ctx->cfg_ptr->ext_zaamo && !has_ext(ctx, RVA)) { \ return false; \ @@ -114,6 +116,28 @@ static bool trans_amoswap_w(DisasContext *ctx, arg_amoswap_w *a) return gen_amo(ctx, a, &tcg_gen_atomic_xchg_tl, MO_TESL); } +static bool trans_ssamoswap_w(DisasContext *ctx, arg_amoswap_w *a) +{ + REQUIRE_A_OR_ZAAMO(ctx); + /* default for qemu-user, use regular RW memory and thus mmu_idx=0 */ + int ss_mmu_idx = 0; + + /* back cfi was not enabled, return false */ + if (!ctx->bcfi_enabled) { + return false; + } + + TCGv dest = dest_gpr(ctx, a->rd); + TCGv src1, src2 = get_gpr(ctx, a->rs2, EXT_NONE); + + decode_save_opc(ctx); + src1 = get_address(ctx, a->rs1, 0); + + tcg_gen_atomic_xchg_tl(dest, src1, src2, ss_mmu_idx, (MO_ALIGN | MO_TESL)); + gen_set_gpr(ctx, a->rd, dest); + return true; +} + static bool trans_amoadd_w(DisasContext *ctx, arg_amoadd_w *a) { REQUIRE_A_OR_ZAAMO(ctx); @@ -183,6 +207,29 @@ static bool trans_amoswap_d(DisasContext *ctx, arg_amoswap_d *a) return gen_amo(ctx, a, &tcg_gen_atomic_xchg_tl, MO_TEUQ); } +static bool trans_ssamoswap_d(DisasContext *ctx, arg_amoswap_w *a) +{ + REQUIRE_64BIT(ctx); + REQUIRE_A_OR_ZAAMO(ctx); + /* default for qemu-user, use regular RW memory and thus mmu_idx=0 */ + int ss_mmu_idx = 0; + + /* back cfi was not enabled, return false */ + if (!ctx->bcfi_enabled) { + return false; + } + + TCGv dest = dest_gpr(ctx, a->rd); + TCGv src1, src2 = get_gpr(ctx, a->rs2, EXT_NONE); + + decode_save_opc(ctx); + src1 = get_address(ctx, a->rs1, 0); + + tcg_gen_atomic_xchg_tl(dest, src1, src2, ss_mmu_idx, (MO_ALIGN | MO_TESQ)); + gen_set_gpr(ctx, a->rd, dest); + return true; +} + static bool trans_amoadd_d(DisasContext *ctx, arg_amoadd_d *a) { REQUIRE_64BIT(ctx); diff --git a/target/riscv/insn_trans/trans_rvzicfiss.c.inc b/target/riscv/insn_trans/trans_rvzicfiss.c.inc new file mode 100644 index 0000000000..c538b7ad99 --- /dev/null +++ b/target/riscv/insn_trans/trans_rvzicfiss.c.inc @@ -0,0 +1,149 @@ +/* + * RISC-V translation routines for the Control-Flow Integrity Extension + * + * Copyright (c) 2024 Rivos Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2 or later, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see . + */ + +static MemOp mxl_memop(DisasContext *ctx) +{ + switch (get_xl(ctx)) { + case MXL_RV32: + return MO_TEUL; + + case MXL_RV64: + return MO_TEUQ; + + case MXL_RV128: + return MO_TEUO; + + default: + g_assert_not_reached(); + } +} + +static bool trans_sspopchk(DisasContext *ctx, arg_sspopchk *a) +{ + /* default for qemu-user, use regular RW memory and thus mmu_idx=0 */ + int ss_mmu_idx = 0; + + /* sspopchk only supported on 32bit and 64bit */ + if (get_xl(ctx) != MXL_RV32 && get_xl(ctx) != MXL_RV64) { + return false; + } + + /* back cfi was not enabled, return false */ + if (!ctx->bcfi_enabled) { + return false; + } + + /* + * sspopchk can only compare with x1 or x5. Everything else defaults to + * zimops + */ + + if (a->rs1 != 1 && a->rs1 != 5) { + return false; + } + + /* + * get data in TCGv using get_gpr + * get addr in TCGv using gen_helper_csrr on CSR_SSP + * use some tcg subtract arithmetic (subtract by XLEN) on addr + * perform ss store on computed address + */ + + TCGv addr = tcg_temp_new(); + TCGLabel *skip = gen_new_label(); + uint32_t tmp = (get_xl(ctx) == MXL_RV64) ? 8 : 4; + TCGv_i32 ssp_csr = tcg_constant_i32(CSR_SSP); + TCGv data = tcg_temp_new(); + gen_helper_csrr(addr, tcg_env, ssp_csr); + + tcg_gen_qemu_ld_tl(data, addr, ss_mmu_idx, + mxl_memop(ctx) | MO_ALIGN); + TCGv rs1 = get_gpr(ctx, a->rs1, EXT_NONE); + tcg_gen_brcond_tl(TCG_COND_EQ, data, rs1, skip); + gen_helper_raise_sw_check_excep(tcg_env, + tcg_constant_tl(RISCV_EXCP_SW_CHECK_BCFI_TVAL), data, rs1); + gen_set_label(skip); + tcg_gen_addi_tl(addr, addr, tmp); + gen_helper_csrw(tcg_env, ssp_csr, addr); + + return true; +} + +static bool trans_sspush(DisasContext *ctx, arg_sspush *a) +{ + /* default for qemu-user, use regular RW memory and thus mmu_idx=0 */ + int ss_mmu_idx = 0; + + /* sspush only supported on 32bit and 64bit */ + if (get_xl(ctx) != MXL_RV32 && get_xl(ctx) != MXL_RV64) { + return false; + } + + /* back cfi was not enabled, return false */ + if (!ctx->bcfi_enabled) { + return false; + } + + /* + * sspush can only push from x1 or x5. Everything else defaults to zimop + */ + if (a->rs2 != 1 && a->rs2 != 5) { + return false; + } + + /* + * get data in TCGv using get_gpr + * get addr in TCGv using gen_helper_csrr on CSR_SSP + * use some tcg subtract arithmetic (subtract by XLEN) on addr + * perform ss store on computed address + */ + + TCGv addr = tcg_temp_new(); + int tmp = (get_xl(ctx) == MXL_RV64) ? -8 : -4; + TCGv_i32 ssp_csr = tcg_constant_i32(CSR_SSP); + TCGv data = get_gpr(ctx, a->rs2, EXT_NONE); + gen_helper_csrr(addr, tcg_env, ssp_csr); + + tcg_gen_addi_tl(addr, addr, tmp); + + tcg_gen_qemu_st_tl(data, addr, ss_mmu_idx, + mxl_memop(ctx) | MO_ALIGN); + gen_helper_csrw(tcg_env, ssp_csr, addr); + + return true; +} + +static bool trans_ssrdp(DisasContext *ctx, arg_ssrdp *a) +{ + /* ssrdp only supported on 32bit and 64bit */ + if (get_xl(ctx) != MXL_RV32 && get_xl(ctx) != MXL_RV64) { + return false; + } + + /* back cfi was not enabled, return false */ + if (!ctx->bcfi_enabled) { + return false; + } + + TCGv dest = get_gpr(ctx, a->rd, EXT_NONE); + TCGv_i32 ssp_csr = tcg_constant_i32(CSR_SSP); + gen_helper_csrr(dest, tcg_env, ssp_csr); + gen_set_gpr(ctx, a->rd, dest); + + return true; +} diff --git a/target/riscv/translate.c b/target/riscv/translate.c index b0526f5d79..de375c32a1 100644 --- a/target/riscv/translate.c +++ b/target/riscv/translate.c @@ -1142,6 +1142,7 @@ static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc) #include "insn_trans/trans_rvzawrs.c.inc" #include "insn_trans/trans_rvzicbo.c.inc" #include "insn_trans/trans_rvzimop.c.inc" +#include "insn_trans/trans_rvzicfiss.c.inc" #include "insn_trans/trans_rvzfa.c.inc" #include "insn_trans/trans_rvzfh.c.inc" #include "insn_trans/trans_rvk.c.inc"