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[97.126.115.157]) by smtp.gmail.com with ESMTPSA id f64sm47287228pfh.0.2018.12.18.20.21.19 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 18 Dec 2018 20:21:20 -0800 (PST) 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=a9DSFdR7AYYRCK7akqnANM9Ri/qYpVRaqeI+N+gswSE=; b=TyUKkirha1CXt0IFWLA95h9OK6svcqejfNSzr3G1LEDSho1F4YnHcOlQBug9chIE1q NE/YR+sflrlhGmK0ApMqTR4oadXADLlD68H/W6yuse3fTaEFXuCspd76VuTBNEwcvHk6 dlbDozH7Xshurweqtz+nS0gUw9pDOaXTaK5ig= 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=a9DSFdR7AYYRCK7akqnANM9Ri/qYpVRaqeI+N+gswSE=; b=XZFmXpxu9PrEegKQCZjJof2lfKi47FqN2uAi3PQVkaJvKxaO8nzNv3vAFY4Zguwibv AzXyDYqqlXOtwk9f8TAFE+b9HdxkU1k5P/B0CnZsKGs85NfsjXsebOlpDL4zBMHbL8gq 9DZSEW+egNb0l0gUEbWOgd11YEfc6/uf1xRHevWsI15MqShnzwc2oVTflkUq2IhQXMtq DAKgJN5KBlxqGLLQ5Qys/knCmAZ/SHAb78SbUjB1c7d/qRcOkFFhUXPbZloeH4SM235r POUMP5qnpKWjuL/BQ7obsDHH8E6qD/PL2hVRQALcMSThpoAXxNYBbiLxCNwhhbhrBldO OGQw== X-Gm-Message-State: AA+aEWZWPlvcBVoV+McSUT2eEdayQd9EjY1VL+yXo8Vx709ewb/NXa4s SIshOSht4UZCEJZPfldd33ugIokJok4= X-Google-Smtp-Source: AFSGD/W5ruem5iQWVa+nhMRtUKUPkovzGv2x2wmG+RmNbh3KHr7JpPAlUm0VFCLLr0m0yexwS9U9dQ== X-Received: by 2002:a63:3507:: with SMTP id c7mr18324739pga.315.1545193280917; Tue, 18 Dec 2018 20:21:20 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Date: Tue, 18 Dec 2018 20:21:09 -0800 Message-Id: <20181219042113.7364-5-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20181219042113.7364-1-richard.henderson@linaro.org> References: <20181219042113.7364-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::443 Subject: [Qemu-devel] [PATCH v5 4/8] linux-user: Split out preadv, pwritev, readv, writev, pread64, pwrite64 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) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: Richard Henderson --- linux-user/syscall-defs.h | 14 ++++ linux-user/syscall-file.inc.c | 124 ++++++++++++++++++++++++++++++++++ linux-user/syscall.c | 93 ------------------------- linux-user/strace.list | 18 ----- 4 files changed, 138 insertions(+), 111 deletions(-) diff --git a/linux-user/syscall-defs.h b/linux-user/syscall-defs.h index b031de1375..ae89be0e87 100644 --- a/linux-user/syscall-defs.h +++ b/linux-user/syscall-defs.h @@ -21,6 +21,18 @@ SYSCALL_DEF(close, ARG_DEC); SYSCALL_DEF(open, ARG_STR, ARG_OPENFLAG, ARG_MODEFLAG); #endif SYSCALL_DEF(openat, ARG_ATDIRFD, ARG_STR, ARG_OPENFLAG, ARG_MODEFLAG); +SYSCALL_DEF_FULL(pread64, .impl =3D impl_pread64, + .args =3D args_pread64_pwrite64, + .arg_type =3D { ARG_DEC, ARG_PTR, ARG_DEC, ARG_DEC64 }); +SYSCALL_DEF_FULL(pwrite64, .impl =3D impl_pwrite64, + .args =3D args_pread64_pwrite64, + .arg_type =3D { ARG_DEC, ARG_PTR, ARG_DEC, ARG_DEC64 }); +SYSCALL_DEF_FULL(preadv, .impl =3D impl_preadv, + .args =3D args_preadv_pwritev, + .arg_type =3D { ARG_DEC, ARG_PTR, ARG_DEC, ARG_DEC64 }); +SYSCALL_DEF_FULL(pwritev, .impl =3D impl_pwritev, + .args =3D args_preadv_pwritev, + .arg_type =3D { ARG_DEC, ARG_PTR, ARG_DEC, ARG_DEC64 }); SYSCALL_DEF(read, ARG_DEC, ARG_PTR, ARG_DEC); #ifdef TARGET_NR_readlink SYSCALL_DEF(readlink, ARG_STR, ARG_PTR, ARG_DEC); @@ -28,4 +40,6 @@ SYSCALL_DEF(readlink, ARG_STR, ARG_PTR, ARG_DEC); #ifdef TARGET_NR_readlinkat SYSCALL_DEF(readlinkat, ARG_ATDIRFD, ARG_STR, ARG_PTR, ARG_DEC); #endif +SYSCALL_DEF(readv, ARG_DEC, ARG_PTR, ARG_DEC); SYSCALL_DEF(write, ARG_DEC, ARG_PTR, ARG_DEC); +SYSCALL_DEF(writev, ARG_DEC, ARG_PTR, ARG_DEC); diff --git a/linux-user/syscall-file.inc.c b/linux-user/syscall-file.inc.c index 11e75044c1..410a763eee 100644 --- a/linux-user/syscall-file.inc.c +++ b/linux-user/syscall-file.inc.c @@ -315,6 +315,104 @@ SYSCALL_IMPL(openat) return do_openat(cpu_env, arg1, arg2, arg3, arg4); } =20 +/* + * Both pread64 and pwrite64 merge args into a 64-bit offset, + * but the input registers and ordering are target specific. + */ +#if TARGET_ABI_BITS =3D=3D 32 +SYSCALL_ARGS(pread64_pwrite64) +{ + /* We have already assigned out[0-2]. */ + int off =3D regpairs_aligned(cpu_env, TARGET_NR_pread64); + out[3] =3D target_offset64(in[3 + off], in[4 + off]); + return def; +} +#else +#define args_pread64_pwrite64 NULL +#endif + +SYSCALL_IMPL(pread64) +{ + void *p =3D lock_user(VERIFY_WRITE, arg2, arg3, 0); + abi_long ret; + + if (!p) { + return -TARGET_EFAULT; + } + ret =3D get_errno(pread64(arg1, p, arg3, arg4)); + unlock_user(p, arg2, ret); + return ret; +} + +SYSCALL_IMPL(pwrite64) +{ + void *p =3D lock_user(VERIFY_READ, arg2, arg3, 0); + abi_long ret; + + if (!p) { + return -TARGET_EFAULT; + } + ret =3D get_errno(pwrite64(arg1, p, arg3, arg4)); + unlock_user(p, arg2, 0); + return ret; +} + +/* + * Both preadv and pwritev merge args 4/5 into a 64-bit offset. + * Moreover, the parts are *always* in little-endian order. + */ +#if TARGET_ABI_BITS =3D=3D 32 +SYSCALL_ARGS(preadv_pwritev) +{ + /* We have already assigned out[0-2]. */ + abi_ulong lo =3D in[3], hi =3D in[4]; + out[3] =3D ((hi << (TARGET_ABI_BITS - 1)) << 1) | lo; + return def; +} +#else +#define args_preadv_pwritev NULL +#endif + +/* Perform the inverse operation for the host. */ +static inline void host_offset64_low_high(unsigned long *l, unsigned long = *h, + uint64_t off) +{ + *l =3D off; + *h =3D (off >> (HOST_LONG_BITS - 1)) >> 1; +} + +SYSCALL_IMPL(preadv) +{ + struct iovec *vec =3D lock_iovec(VERIFY_WRITE, arg2, arg3, 0); + unsigned long lo, hi; + abi_long ret; + + if (vec =3D=3D NULL) { + return -host_to_target_errno(errno); + } + + host_offset64_low_high(&lo, &hi, arg4); + ret =3D get_errno(safe_preadv(arg1, vec, arg3, lo, hi)); + unlock_iovec(vec, arg2, arg3, 1); + return ret; +} + +SYSCALL_IMPL(pwritev) +{ + struct iovec *vec =3D lock_iovec(VERIFY_READ, arg2, arg3, 1); + unsigned long lo, hi; + abi_long ret; + + if (vec =3D=3D NULL) { + ret =3D -host_to_target_errno(errno); + } + + host_offset64_low_high(&lo, &hi, arg4); + ret =3D get_errno(safe_pwritev(arg1, vec, arg3, lo, hi)); + unlock_iovec(vec, arg2, arg3, 0); + return ret; +} + SYSCALL_IMPL(read) { abi_long ret; @@ -403,6 +501,19 @@ SYSCALL_IMPL(readlinkat) } #endif =20 +SYSCALL_IMPL(readv) +{ + struct iovec *vec =3D lock_iovec(VERIFY_WRITE, arg2, arg3, 0); + abi_long ret; + + if (vec =3D=3D NULL) { + return -host_to_target_errno(errno); + } + ret =3D get_errno(safe_readv(arg1, vec, arg3)); + unlock_iovec(vec, arg2, arg3, 1); + return ret; +} + SYSCALL_IMPL(write) { TargetFdDataFunc trans; @@ -431,3 +542,16 @@ SYSCALL_IMPL(write) unlock_user(p, arg2, 0); return ret; } + +SYSCALL_IMPL(writev) +{ + struct iovec *vec =3D lock_iovec(VERIFY_READ, arg2, arg3, 1); + abi_long ret; + + if (vec =3D=3D NULL) { + return -host_to_target_errno(errno); + } + ret =3D get_errno(safe_writev(arg1, vec, arg3)); + unlock_iovec(vec, arg2, arg3, 0); + return ret; +} diff --git a/linux-user/syscall.c b/linux-user/syscall.c index d4c11c3e93..9a9b6c543c 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -2364,23 +2364,6 @@ 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) { @@ -8910,60 +8893,6 @@ static abi_long do_syscall1(void *cpu_env, int num, = abi_long arg1, /* NOTE: the flock constant seems to be the same for every Linux platform */ return get_errno(safe_flock(arg1, arg2)); - case TARGET_NR_readv: - { - struct iovec *vec =3D lock_iovec(VERIFY_WRITE, arg2, arg3, 0); - if (vec !=3D NULL) { - ret =3D get_errno(safe_readv(arg1, vec, arg3)); - unlock_iovec(vec, arg2, arg3, 1); - } else { - ret =3D -host_to_target_errno(errno); - } - } - return ret; - case TARGET_NR_writev: - { - struct iovec *vec =3D lock_iovec(VERIFY_READ, arg2, arg3, 1); - if (vec !=3D NULL) { - ret =3D get_errno(safe_writev(arg1, vec, arg3)); - unlock_iovec(vec, arg2, arg3, 0); - } else { - ret =3D -host_to_target_errno(errno); - } - } - return ret; -#if defined(TARGET_NR_preadv) - case TARGET_NR_preadv: - { - struct iovec *vec =3D lock_iovec(VERIFY_WRITE, arg2, arg3, 0); - if (vec !=3D NULL) { - 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); - } - } - return ret; -#endif -#if defined(TARGET_NR_pwritev) - case TARGET_NR_pwritev: - { - struct iovec *vec =3D lock_iovec(VERIFY_READ, arg2, arg3, 1); - if (vec !=3D NULL) { - 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); - } - } - return ret; -#endif case TARGET_NR_getsid: return get_errno(getsid(arg1)); #if defined(TARGET_NR_fdatasync) /* Not on alpha (osf_datasync ?) */ @@ -9295,28 +9224,6 @@ static abi_long do_syscall1(void *cpu_env, int num, = abi_long arg1, #else #error unreachable #endif -#endif -#ifdef TARGET_NR_pread64 - case TARGET_NR_pread64: - if (regpairs_aligned(cpu_env, num)) { - arg4 =3D arg5; - arg5 =3D arg6; - } - if (!(p =3D lock_user(VERIFY_WRITE, arg2, arg3, 0))) - return -TARGET_EFAULT; - ret =3D get_errno(pread64(arg1, p, arg3, target_offset64(arg4, arg= 5))); - unlock_user(p, arg2, ret); - return ret; - case TARGET_NR_pwrite64: - if (regpairs_aligned(cpu_env, num)) { - arg4 =3D arg5; - arg5 =3D arg6; - } - if (!(p =3D lock_user(VERIFY_READ, arg2, arg3, 1))) - return -TARGET_EFAULT; - ret =3D get_errno(pwrite64(arg1, p, arg3, target_offset64(arg4, ar= g5))); - unlock_user(p, arg2, 0); - return ret; #endif case TARGET_NR_getcwd: if (!(p =3D lock_user(VERIFY_WRITE, arg1, arg2, 0))) diff --git a/linux-user/strace.list b/linux-user/strace.list index ff8bb19f5f..8f96b7a105 100644 --- a/linux-user/strace.list +++ b/linux-user/strace.list @@ -1034,12 +1034,6 @@ #ifdef TARGET_NR_prctl { TARGET_NR_prctl, "prctl" , NULL, NULL, NULL }, #endif -#ifdef TARGET_NR_pread64 -{ TARGET_NR_pread64, "pread64" , NULL, NULL, NULL }, -#endif -#ifdef TARGET_NR_preadv -{ TARGET_NR_preadv, "preadv" , NULL, NULL, NULL }, -#endif #ifdef TARGET_NR_prlimit64 { TARGET_NR_prlimit64, "prlimit64" , NULL, NULL, NULL }, #endif @@ -1064,12 +1058,6 @@ #ifdef TARGET_NR_putpmsg { TARGET_NR_putpmsg, "putpmsg" , NULL, NULL, NULL }, #endif -#ifdef TARGET_NR_pwrite64 -{ TARGET_NR_pwrite64, "pwrite64" , NULL, NULL, NULL }, -#endif -#ifdef TARGET_NR_pwritev -{ TARGET_NR_pwritev, "pwritev" , NULL, NULL, NULL }, -#endif #ifdef TARGET_NR_query_module { TARGET_NR_query_module, "query_module" , NULL, NULL, NULL }, #endif @@ -1091,9 +1079,6 @@ #ifdef TARGET_NR_readlinkat { TARGET_NR_readlinkat, "readlinkat" , NULL, print_readlinkat, NULL }, #endif -#ifdef TARGET_NR_readv -{ TARGET_NR_readv, "readv" , NULL, NULL, NULL }, -#endif #ifdef TARGET_NR_reboot { TARGET_NR_reboot, "reboot" , NULL, NULL, NULL }, #endif @@ -1629,9 +1614,6 @@ #ifdef TARGET_NR_write { TARGET_NR_write, "write" , "%s(%d,%#x,%d)", NULL, NULL }, #endif -#ifdef TARGET_NR_writev -{ TARGET_NR_writev, "writev" , "%s(%d,%p,%#x)", NULL, NULL }, -#endif #ifdef TARGET_NR_utimensat { TARGET_NR_utimensat, "utimensat", NULL, print_utimensat, NULL }, #endif --=20 2.17.2