Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
---
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(-)
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
--
2.17.2
