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Thu, 25 Jul 2024 16:46:33 -0700 (PDT) From: Deepak Gupta To: qemu-riscv@nongnu.org, qemu-devel@nongnu.org, jim.shu@sifive.com, andy.chiu@sifive.com, jesse.huang@sifive.com, kito.cheng@sifive.com Cc: 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 Subject: [PATCH 08/24] linux-user/syscall: introduce prctl for indirect branch tracking Date: Thu, 25 Jul 2024 16:45:57 -0700 Message-ID: <20240725234614.3850142-9-debug@rivosinc.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240725234614.3850142-1-debug@rivosinc.com> References: <20240725234614.3850142-1-debug@rivosinc.com> 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::432; envelope-from=debug@rivosinc.com; helo=mail-pf1-x432.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=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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @rivosinc-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1721951426975116600 Content-Type: text/plain; charset="utf-8" Each application enables indirect branch tracking (forward cfi) for itself via prctl. Adding branch tracking prctl in linux-user/syscall. Using same prctl code as proposed in cfi patches in kernel mailing list [1] [1] - https://lore.kernel.org/all/20240403234054.2020347-1-debug@rivosinc.c= om/ Signed-off-by: Deepak Gupta Co-developed-by: Jim Shu Co-developed-by: Andy Chiu Co-developed-by: Jesse Huang --- linux-user/syscall.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index b8c278b91d..ec157c1088 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -6295,6 +6295,17 @@ abi_long do_arch_prctl(CPUX86State *env, int code, a= bi_ulong addr) # define PR_SME_VL_INHERIT (1 << 17) #endif =20 +#ifndef PR_GET_INDIR_BR_LP_STATUS +# define PR_GET_INDIR_BR_LP_STATUS 74 +#endif +#ifndef PR_SET_INDIR_BR_LP_STATUS +# define PR_SET_INDIR_BR_LP_STATUS 75 +# define PR_INDIR_BR_LP_ENABLE (1UL << 0) +#endif +#ifndef PR_LOCK_INDIR_BR_LP_STATUS +# define PR_LOCK_INDIR_BR_LP_STATUS 76 +#endif + #include "target_prctl.h" =20 static abi_long do_prctl_inval0(CPUArchState *env) @@ -6477,6 +6488,14 @@ static abi_long do_prctl(CPUArchState *env, abi_long= option, abi_long arg2, case PR_SET_TSC: /* Disable to prevent the target disabling stuff we need. */ return -TARGET_EINVAL; + case PR_GET_INDIR_BR_LP_STATUS: + case PR_SET_INDIR_BR_LP_STATUS: + case PR_LOCK_INDIR_BR_LP_STATUS: +#ifndef do_prctl_cfi + return do_prctl_inval1(env, arg2); +#else + return do_prctl_cfi(env, option, arg2); +#endif =20 default: qemu_log_mask(LOG_UNIMP, "Unsupported prctl: " TARGET_ABI_FMT_ld "= \n", --=20 2.44.0