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X-Received-From: 2607:f8b0:4864:20::642 Subject: [Qemu-devel] [PATCH v6 12/49] linux-user: Split out preadv, pwritev 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+patch=linaro.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Richard Henderson --- linux-user/syscall-defs.h | 6 ++++ linux-user/syscall-file.inc.c | 64 +++++++++++++++++++++++++++++++++++ linux-user/syscall.c | 49 --------------------------- linux-user/strace.list | 6 ---- 4 files changed, 70 insertions(+), 55 deletions(-) -- 2.17.2 diff --git a/linux-user/syscall-defs.h b/linux-user/syscall-defs.h index 027793d5d0..ae89be0e87 100644 --- a/linux-user/syscall-defs.h +++ b/linux-user/syscall-defs.h @@ -27,6 +27,12 @@ SYSCALL_DEF_FULL(pread64, .impl = impl_pread64, SYSCALL_DEF_FULL(pwrite64, .impl = impl_pwrite64, .args = args_pread64_pwrite64, .arg_type = { ARG_DEC, ARG_PTR, ARG_DEC, ARG_DEC64 }); +SYSCALL_DEF_FULL(preadv, .impl = impl_preadv, + .args = args_preadv_pwritev, + .arg_type = { ARG_DEC, ARG_PTR, ARG_DEC, ARG_DEC64 }); +SYSCALL_DEF_FULL(pwritev, .impl = impl_pwritev, + .args = args_preadv_pwritev, + .arg_type = { 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); diff --git a/linux-user/syscall-file.inc.c b/linux-user/syscall-file.inc.c index e79cfabf56..63401684c3 100644 --- a/linux-user/syscall-file.inc.c +++ b/linux-user/syscall-file.inc.c @@ -379,6 +379,70 @@ SYSCALL_IMPL(pwrite64) 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 == 32 +SYSCALL_ARGS(preadv_pwritev) +{ + /* We have already assigned out[0-2]. */ + abi_ulong lo = in[3], hi = in[4]; + out[3] = (((uint64_t)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 = off; + *h = (off >> (HOST_LONG_BITS - 1)) >> 1; +} + +SYSCALL_IMPL(preadv) +{ + int fd = arg1; + abi_ulong target_vec = arg2; + int count = arg3; + uint64_t off = arg4; + struct iovec *vec = lock_iovec(VERIFY_WRITE, target_vec, count, 0); + unsigned long lo, hi; + abi_long ret; + + if (vec == NULL) { + return -TARGET_EFAULT; + } + + host_offset64_low_high(&lo, &hi, off); + ret = get_errno(safe_preadv(fd, vec, count, lo, hi)); + unlock_iovec(vec, target_vec, count, 1); + return ret; +} + +SYSCALL_IMPL(pwritev) +{ + int fd = arg1; + abi_ulong target_vec = arg2; + int count = arg3; + uint64_t off = arg4; + struct iovec *vec = lock_iovec(VERIFY_READ, target_vec, count, 1); + unsigned long lo, hi; + abi_long ret; + + if (vec == NULL) { + return -TARGET_EFAULT; + } + + host_offset64_low_high(&lo, &hi, off); + ret = get_errno(safe_pwritev(fd, vec, count, lo, hi)); + unlock_iovec(vec, target_vec, count, 0); + return ret; +} + SYSCALL_IMPL(read) { int fd = arg1; diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 80806c0150..9606f15a09 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -2403,23 +2403,6 @@ static abi_long do_getsockopt(int sockfd, int level, int optname, return ret; } -/* 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 = tlow | - ((unsigned long long)thigh << TARGET_LONG_BITS / 2) << - TARGET_LONG_BITS / 2; - - *hlow = off; - *hhigh = (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) { @@ -8949,38 +8932,6 @@ 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)); -#if defined(TARGET_NR_preadv) - case TARGET_NR_preadv: - { - struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 0); - if (vec != NULL) { - unsigned long low, high; - - target_to_host_low_high(arg4, arg5, &low, &high); - ret = get_errno(safe_preadv(arg1, vec, arg3, low, high)); - unlock_iovec(vec, arg2, arg3, 1); - } else { - ret = -host_to_target_errno(errno); - } - } - return ret; -#endif -#if defined(TARGET_NR_pwritev) - case TARGET_NR_pwritev: - { - struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1); - if (vec != NULL) { - unsigned long low, high; - - target_to_host_low_high(arg4, arg5, &low, &high); - ret = get_errno(safe_pwritev(arg1, vec, arg3, low, high)); - unlock_iovec(vec, arg2, arg3, 0); - } else { - ret = -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 ?) */ diff --git a/linux-user/strace.list b/linux-user/strace.list index c7e573669d..586eb55482 100644 --- a/linux-user/strace.list +++ b/linux-user/strace.list @@ -1025,9 +1025,6 @@ #ifdef TARGET_NR_prctl { TARGET_NR_prctl, "prctl" , 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 @@ -1052,9 +1049,6 @@ #ifdef TARGET_NR_putpmsg { TARGET_NR_putpmsg, "putpmsg" , 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