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[97.113.8.179]) by smtp.gmail.com with ESMTPSA id q85-v6sm9362783pfa.151.2018.08.18.12.01.21 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 18 Aug 2018 12:01:22 -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=4xBjw1bDXVECuMm9Kv+AFqaT2umgQswrrWiIl/+1TKs=; b=d01+zLlsWAWgwsQuahT/nEKMBvdAp1kxj/LhY39WGfddQ3ExCZiegTKDPmyJ+GYQa/ Bki+21xX+baNy47J0wn4aJGAUgn66R7lVIQWFPAzjQ2guhxjvgZ+R20EFYbjFMAJ/vyl VZx9rgjTathBb3l7wCOQ1XeE4vQxUiJD+XGBU= 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=4xBjw1bDXVECuMm9Kv+AFqaT2umgQswrrWiIl/+1TKs=; b=FSSHvbgsLshKb+F/zDtutc0XXODiYsLcAIg8XGrI6IQbtHaEm1zpwugOp5D4E47m0D b6TR/lKAc/IYkkCgusMQ6HboFuMm14ntFR13Pj1EzI/0kVWqx6ikzckRlDI7eTgQ4kOg kQQtFfChLblfDwyZnuEqIAwp7b6hWkjN4CMQ6MCxvB5fuo65snpak4dwqEfizhFrO9zr Pja151fS1xa9Is3m7VhBQqAF5l7rsm7sElEYXtXMxc8PTyEmiFe3LSIEJneVtTj2C6ez busGqDwCGyNQVTmMyjV/Mv+pEJ9WozQQdOIjmgINrNbjsm5YQohpk4lYoJ5bkh8bDCDA O9dg== X-Gm-Message-State: AOUpUlG/deYQXNEZdF5KWf0T0vhUKwCgvDx/Ws7ay4FKHJ9dua7U43Kw o05Aw/uNb/bWqyNUXDJq29EIJK2XJKA= X-Google-Smtp-Source: AA+uWPyRZgwGqBxSjXTHxAZC+FbKvzyCYD+IY3SNOnuwDx3ALa08EFaou3/4tpHFzRSNdt8+vMp2Pw== X-Received: by 2002:a63:931c:: with SMTP id b28-v6mr2346884pge.81.1534618883191; Sat, 18 Aug 2018 12:01:23 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Sat, 18 Aug 2018 12:01:04 -0700 Message-Id: <20180818190118.12911-3-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180818190118.12911-1-richard.henderson@linaro.org> References: <20180818190118.12911-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::444 Subject: [Qemu-devel] [PATCH v4 02/16] 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: RDMRC_1 RDKM_2 RSF_0 Z_629925259 SPT_0 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. Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Laurent Vivier Signed-off-by: Richard Henderson --- linux-user/syscall.c | 77 +++++++++++++++++++++++++++----------------- 1 file changed, 48 insertions(+), 29 deletions(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 6cd9b33a0d..dddd386ec4 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -7986,13 +7986,15 @@ 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; @@ -8007,25 +8009,6 @@ abi_long do_syscall(void *cpu_env, int num, abi_long= arg1, #endif void *p; =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 - - 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). @@ -12836,11 +12819,47 @@ abi_long do_syscall(void *cpu_env, int num, abi_l= ong arg1, break; } fail: - if(do_strace) - print_syscall_ret(num, ret); - trace_guest_user_syscall_ret(cpu, num, ret); return ret; efault: ret =3D -TARGET_EFAULT; 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; + +#ifdef 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 + + 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); + } + + trace_guest_user_syscall_ret(cpu, num, ret); + return ret; +} --=20 2.17.1