From: Laurent Vivier <laur...@vivier.eu>
When a fd is opened using eventfd(), a read provides
a 64bit counter in the host byte order, and a
write increase the internal counter by the provided
64bit value.
Signed-off-by: Laurent Vivier <laur...@vivier.eu>
Signed-off-by: Riku Voipio <riku.voi...@linaro.org>
---
linux-user/syscall.c | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index b2b563e388..2da8426aaa 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7671,6 +7671,28 @@ static target_timer_t get_timer_id(abi_long arg)
return timerid;
}
+static abi_long swap_data_eventfd(void *buf, size_t len)
+{
+ uint64_t *counter = buf;
+ int i;
+
+ if (len < sizeof(uint64_t)) {
+ return -EINVAL;
+ }
+
+ for (i = 0; i < len; i += sizeof(uint64_t)) {
+ *counter = tswap64(*counter);
+ counter++;
+ }
+
+ return len;
+}
+
+static TargetFdTrans target_eventfd_trans = {
+ .host_to_target_data = swap_data_eventfd,
+ .target_to_host_data = swap_data_eventfd,
+};
+
/* do_syscall() should always have a single exit point at the end so
that actions, such as logging of syscall results, can be performed.
All errnos that do_syscall() returns must be -TARGET_<errcode>. */
@@ -11876,7 +11898,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
arg1,
#if defined(TARGET_NR_eventfd)
case TARGET_NR_eventfd:
ret = get_errno(eventfd(arg1, 0));
- fd_trans_unregister(ret);
+ fd_trans_register(ret, &target_eventfd_trans);
break;
#endif
#if defined(TARGET_NR_eventfd2)
@@ -11890,7 +11912,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
arg1,
host_flags |= O_CLOEXEC;
}
ret = get_errno(eventfd(arg1, host_flags));
- fd_trans_unregister(ret);
+ fd_trans_register(ret, &target_eventfd_trans);
break;
}
#endif
--
2.11.0
