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Fix file offset for preadv/pwritev linux-user syscalls. 

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Merge remote-tracking branch 'remotes/xtensa/tags/20180409-xtensa' into staging

Fix file offset for preadv/pwritev linux-user syscalls.

# gpg: Signature made Tue 10 Apr 2018 03:04:24 BST
# gpg:                using RSA key 51F9CC91F83FA044
# gpg: Good signature from "Max Filippov <filippov@cadence.com>"
# gpg:                 aka "Max Filippov <max.filippov@cogentembedded.com>"
# gpg:                 aka "Max Filippov <jcmvbkbc@gmail.com>"
# Primary key fingerprint: 2B67 854B 98E5 327D CDEB  17D8 51F9 CC91 F83F A044

* remotes/xtensa/tags/20180409-xtensa:
  linux-user: fix preadv/pwritev offsets

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-04-10 10:22:45 +01:00
parent 1e7e92e2ef 9ac225171c
commit fb4fe32d5b
1 changed files with 25 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
linux-user/syscall.c
View File

@ -3386,6 +3386,23 @@ static abi_long do_getsockopt(int sockfd, int level, int optname,
return ret; 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, static struct iovec *lock_iovec(int type, abi_ulong target_addr,
abi_ulong count, int copy) abi_ulong count, int copy)
{ {
@ -10452,7 +10469,10 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
{ {
struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 0); struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 0);
if (vec != NULL) { if (vec != NULL) {
ret = get_errno(safe_preadv(arg1, vec, arg3, arg4, arg5)); 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); unlock_iovec(vec, arg2, arg3, 1);
} else { } else {
ret = -host_to_target_errno(errno); ret = -host_to_target_errno(errno);
@ -10465,7 +10485,10 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
{ {
struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1); struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
if (vec != NULL) { if (vec != NULL) {
ret = get_errno(safe_pwritev(arg1, vec, arg3, arg4, arg5)); 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); unlock_iovec(vec, arg2, arg3, 0);
} else { } else {
ret = -host_to_target_errno(errno); ret = -host_to_target_errno(errno);