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[97.126.112.211]) by smtp.gmail.com with ESMTPSA id c4-v6sm4431782pgv.86.2018.06.01.00.30.53 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 01 Jun 2018 00:30:53 -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; bh=jiV3ryV7bNwrqAaXgi+PnuEbFIblWYhP1BSR8J6DhRw=; b=TVzZ+bqTpo9gtK+zwDHgfVCX3V1FOYAaovv9i4KT7/YCyULiaS8MBMxFywRhi2dAaV izfWVZa+4MiIiVl8RMTPQlsjLWOpqLsP9snQFuRog4oxWjQIlOatDbUj2REVFYYbmlbm WzDKRVuHbC/oM9bJQBKQ9UtjhpmN9C/paamHo= 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; bh=jiV3ryV7bNwrqAaXgi+PnuEbFIblWYhP1BSR8J6DhRw=; b=WriKzvkffXN9ezzM9rWQrZ+iRGptJI2kRVxqGRW2QYqULFE0AbSRkZnmT3JE3LsT7c ceX7hPWaaiZYoXttIi0scC10R1T8t5aahr6C7pu8in+blz4m1NxBIo/17qbGBP+jLYnY zNebCfqAh7vxfSWNIYfQ8lyBZ7DxUU2JXkGBkSPMYyQmNxMKCzzCHe+RIp0WijYnCpFP 99H05sn3N1LD/hdZ6/WBy3Duo3CZL4QBVDn0sqIYA2fV5FyTbTM5uc3Gpp8Rym3xVRNC Bl119Y7Hew7ga3QCdT+SlZOhIhIBP8o2BScRas4t1O5tFkgK79W07SPZLJa7+ZZ3PPFK 8Xew== X-Gm-Message-State: ALKqPwe5EOon9MjBZGbP28kOJgcUkKKpJN/6at1rGjGtNyorFm1vaOWR EjGUzRjk6SNAHbr0A55ztWm8TBTEuWM= X-Google-Smtp-Source: ADUXVKLLDz6beou5Nmsm4Yj9TlI5Y0PaGmkZSlkgtajIGvdVuxZmhBKFsExMrnFgOpNNZ94cGZEJWg== X-Received: by 2002:a17:902:4301:: with SMTP id i1-v6mr10106217pld.280.1527838254504; Fri, 01 Jun 2018 00:30:54 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Fri, 1 Jun 2018 00:30:18 -0700 Message-Id: <20180601073050.8054-2-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180601073050.8054-1-richard.henderson@linaro.org> References: <20180601073050.8054-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:400e:c01::243 Subject: [Qemu-devel] [PATCH 01/33] linux-user: Split out do_syscall1 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: laurent@vivier.eu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" There was supposed to be a single point of return for do_syscall so that tracing works properly. However, there are a few bugs in that area. It is significantly simpler to simply split out an inner function to enforce this. Signed-off-by: Richard Henderson Reviewed-by: Laurent Vivier --- linux-user/syscall.c | 89 +++++++++++++++++++++++++++----------------- 1 file changed, 54 insertions(+), 35 deletions(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index b75dd9a5bc..ebaefebcc2 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -7962,13 +7962,15 @@ static int host_to_target_cpu_mask(const unsigned l= ong *host_mask, return 0; } =20 -/* do_syscall() should always have a single exit point at the end so - that actions, such as logging of syscall results, can be performed. - All errnos that do_syscall() returns must be -TARGET_. */ -abi_long do_syscall(void *cpu_env, int num, abi_long arg1, - abi_long arg2, abi_long arg3, abi_long arg4, - abi_long arg5, abi_long arg6, abi_long arg7, - abi_long arg8) +/* This is an internal helper for do_syscall so that it is easier + * to have a single return point, so that actions, such as logging + * of syscall results, can be performed. + * All errnos that do_syscall() returns must be -TARGET_. + */ +static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, + abi_long arg2, abi_long arg3, abi_long arg4, + abi_long arg5, abi_long arg6, abi_long arg7, + abi_long arg8) { CPUState *cpu =3D ENV_GET_CPU(cpu_env); abi_long ret; @@ -7977,28 +7979,6 @@ abi_long do_syscall(void *cpu_env, int num, abi_long= arg1, void *p; char *fn; =20 -#if defined(DEBUG_ERESTARTSYS) - /* Debug-only code for exercising the syscall-restart code paths - * in the per-architecture cpu main loops: restart every syscall - * the guest makes once before letting it through. - */ - { - static int flag; - - flag =3D !flag; - if (flag) { - return -TARGET_ERESTARTSYS; - } - } -#endif - -#ifdef DEBUG - gemu_log("syscall %d", num); -#endif - trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6,= arg7, arg8); - if(do_strace) - print_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6); - switch(num) { case TARGET_NR_exit: /* In old applications this may be used to implement _exit(2). @@ -13101,12 +13081,6 @@ abi_long do_syscall(void *cpu_env, int num, abi_lo= ng arg1, break; } fail: -#ifdef DEBUG - gemu_log(" =3D " TARGET_ABI_FMT_ld "\n", ret); -#endif - if(do_strace) - print_syscall_ret(num, ret); - trace_guest_user_syscall_ret(cpu, num, ret); return ret; efault: ret =3D -TARGET_EFAULT; @@ -13115,3 +13089,48 @@ ebadf: ret =3D -TARGET_EBADF; goto fail; } + +abi_long do_syscall(void *cpu_env, int num, abi_long arg1, + abi_long arg2, abi_long arg3, abi_long arg4, + abi_long arg5, abi_long arg6, abi_long arg7, + abi_long arg8) +{ + CPUState *cpu =3D ENV_GET_CPU(cpu_env); + abi_long ret; + +#if defined(DEBUG_ERESTARTSYS) + /* Debug-only code for exercising the syscall-restart code paths + * in the per-architecture cpu main loops: restart every syscall + * the guest makes once before letting it through. + */ + { + static bool flag; + flag =3D !flag; + if (flag) { + return -TARGET_ERESTARTSYS; + } + } +#endif +#ifdef DEBUG + gemu_log("syscall %d", num); +#endif + + trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, + arg5, arg6, arg7, arg8); + + if (unlikely(do_strace)) { + print_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6); + ret =3D do_syscall1(cpu_env, num, arg1, arg2, arg3, arg4, + arg5, arg6, arg7, arg8); + print_syscall_ret(num, ret); + } else { + ret =3D do_syscall1(cpu_env, num, arg1, arg2, arg3, arg4, + arg5, arg6, arg7, arg8); + } + +#ifdef DEBUG + gemu_log(" =3D " TARGET_ABI_FMT_ld "\n", ret); +#endif + trace_guest_user_syscall_ret(cpu, num, ret); + return ret; +} --=20 2.17.0