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linux-user: fix eventfd

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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 <laurent@vivier.eu>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Laurent Vivier 2017-03-01 10:37:48 +01:00 committed by Riku Voipio
parent 04b9bcf911
commit 562a20b4ef
1 changed files with 24 additions and 2 deletions
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26
linux-user/syscall.c
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@ -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