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[2001:470:27:1fa::2]) by smtp.gmail.com with ESMTPSA id h10sm283308ljc.96.2018.04.09.19.18.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 09 Apr 2018 19:18:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=NRO+5mIvbqQRFPnoeDlYIrscQvaqurzKZaIc1Ev/rdg=; b=MCe1e4hTvw69+VjgmtfGBz5cZh2kWqcyOQ8gXMVqvT0Zqd1fDW44DM7ufYhQ8Q+ip0 qNhGku63yywwedV5Ugcegig65/mH2ugsARPpfptSSW2Vm4K0uRMhbWblY2dHv+jU71gu IDOcDKJeX7ijO4kfdzN4SNrOVTdixJ9pypyp8A4XRRv5rVOdoPk23GbLfmNyEtiNFhp/ M3be935KB1RJWu/d74CzEFdeLNq6W5HQDKPvNFePAAkeI75tOQRT7vr4tXCimRr7Th9a Ycma9aeXGYhskKOyVWa0p8brYdE/Hu8Klaf5JzYYaAP49vriE9pG4fxJAcxD68T9GIEq 38wA== 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=NRO+5mIvbqQRFPnoeDlYIrscQvaqurzKZaIc1Ev/rdg=; b=pBo9iDkQ8sqeq4hIumQ2SOlNc7tzuwr5FdydW1zD/C6jddbTvT3pcFpLO7e7OIdIrU v5lX6rybM4hozBHSncEWz+zocB3kQ9sRAJ7Zistdzf9bhHS/cg9YkupMUw7SjkwGZcK5 qhaS2QUBnsNDyl/oxSbbYkRDHZltsoC/BIkrUxSkYa0h4Sx7r8fzkJilWlkm/f36k1oG Xxr8UdOP9jOMMWSqc5GbTSyYNSMFA+S8oVAxPTwSkFqSjqF9C6x7+dZbUjqjOP8oondy 2xt5o/K/anDZ9bcXfD/m/cU1EGmxIuR+wtL6wg1BgI+vhIVcaPVJBlyIkY6bp7dSVvbB yy5w== X-Gm-Message-State: ALQs6tDenF6sj3pyABfktmrEYIyCBlSdb2p2UWAS31sbiv7H2MEMAn6t +xkZXcgzyY8jqeuRQtHE2uxIDQ== X-Google-Smtp-Source: AIpwx49i+DnbdoUNKQ9wFLfU+FCYODESjQg4Ma7AQJXq+cJycZtfwdICBHee0JLe06M7+EctuU1cxA== X-Received: by 10.46.1.213 with SMTP id f82mr24051571lji.35.1523326703574; Mon, 09 Apr 2018 19:18:23 -0700 (PDT) From: Max Filippov To: qemu-devel@nongnu.org Date: Mon, 9 Apr 2018 19:17:45 -0700 Message-Id: <20180410021745.32378-2-jcmvbkbc@gmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180410021745.32378-1-jcmvbkbc@gmail.com> References: <20180410021745.32378-1-jcmvbkbc@gmail.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4010:c07::241 Subject: [Qemu-devel] [PULL 1/1] linux-user: fix preadv/pwritev offsets 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: Peter Maydell , Riku Voipio , Richard Henderson , Laurent Vivier , Max Filippov 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" preadv/pwritev accept low and high parts of file offset in two separate parameters. When host bitness doesn't match guest bitness these parts must be appropriately recombined. Introduce target_to_host_low_high that does this recombination and use it in preadv/pwritev syscalls. This fixes glibc testsuite test misc/tst-preadvwritev64. Reviewed-by: Laurent Vivier Reviewed-by: Richard Henderson Signed-off-by: Max Filippov --- linux-user/syscall.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 5ef517613577..0eab5cc6ade1 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -3386,6 +3386,23 @@ static abi_long do_getsockopt(int sockfd, int level,= int optname, return ret; } =20 +/* Convert target low/high pair representing file offset into the host + * low/high pair. This function doesn't handle offsets bigger than 64 bits + * as the kernel doesn't handle them either. + */ +static void target_to_host_low_high(abi_ulong tlow, + abi_ulong thigh, + unsigned long *hlow, + unsigned long *hhigh) +{ + uint64_t off =3D tlow | + ((unsigned long long)thigh << TARGET_LONG_BITS / 2) << + TARGET_LONG_BITS / 2; + + *hlow =3D off; + *hhigh =3D (off >> HOST_LONG_BITS / 2) >> HOST_LONG_BITS / 2; +} + static struct iovec *lock_iovec(int type, abi_ulong target_addr, abi_ulong count, int copy) { @@ -10449,7 +10466,10 @@ abi_long do_syscall(void *cpu_env, int num, abi_lo= ng arg1, { struct iovec *vec =3D lock_iovec(VERIFY_WRITE, arg2, arg3, 0); if (vec !=3D NULL) { - ret =3D get_errno(safe_preadv(arg1, vec, arg3, arg4, arg5)= ); + unsigned long low, high; + + target_to_host_low_high(arg4, arg5, &low, &high); + ret =3D get_errno(safe_preadv(arg1, vec, arg3, low, high)); unlock_iovec(vec, arg2, arg3, 1); } else { ret =3D -host_to_target_errno(errno); @@ -10462,7 +10482,10 @@ abi_long do_syscall(void *cpu_env, int num, abi_lo= ng arg1, { struct iovec *vec =3D lock_iovec(VERIFY_READ, arg2, arg3, 1); if (vec !=3D NULL) { - ret =3D get_errno(safe_pwritev(arg1, vec, arg3, arg4, arg5= )); + unsigned long low, high; + + target_to_host_low_high(arg4, arg5, &low, &high); + ret =3D get_errno(safe_pwritev(arg1, vec, arg3, low, high)= ); unlock_iovec(vec, arg2, arg3, 0); } else { ret =3D -host_to_target_errno(errno); --=20 2.11.0