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linux-user: Fix conversion of sigevent argument to timer_create 

There were a number of bugs in the conversion of the sigevent
argument to timer_create from target to host format:
 * signal number not converted from target to host
 * thread ID not copied across
 * sigev_value not copied across
 * we never unlocked the struct when we were done

Between them, these problems meant that SIGEV_THREAD_ID
timers (and the glibc-implemented SIGEV_THREAD timers which
depend on them) didn't work.

Fix these problems and clean up the code a little by pulling
the struct conversion out into its own function, in line with
how we convert various other structs. This allows the test
program in bug LP:1042388 to run.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Peter Maydell 2014-08-09 15:42:32 +01:00 committed by Riku Voipio
parent 47575997be
commit c065976f2b
1 changed files with 30 additions and 8 deletions
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38
linux-user/syscall.c
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@ -4912,6 +4912,32 @@ static inline abi_long host_to_target_itimerspec(abi_ulong target_addr,
return 0;
}
static inline abi_long target_to_host_sigevent(struct sigevent *host_sevp,
abi_ulong target_addr)
{
struct target_sigevent *target_sevp;
if (!lock_user_struct(VERIFY_READ, target_sevp, target_addr, 1)) {
return -TARGET_EFAULT;
}
/* This union is awkward on 64 bit systems because it has a 32 bit
* integer and a pointer in it; we follow the conversion approach
* used for handling sigval types in signal.c so the guest should get
* the correct value back even if we did a 64 bit byteswap and it's
* using the 32 bit integer.
*/
host_sevp->sigev_value.sival_ptr =
(void *)(uintptr_t)tswapal(target_sevp->sigev_value.sival_ptr);
host_sevp->sigev_signo =
target_to_host_signal(tswap32(target_sevp->sigev_signo));
host_sevp->sigev_notify = tswap32(target_sevp->sigev_notify);
host_sevp->_sigev_un._tid = tswap32(target_sevp->_sigev_un._tid);
unlock_user_struct(target_sevp, target_addr, 1);
return 0;
}
#if defined(TARGET_NR_stat64) || defined(TARGET_NR_newfstatat)
static inline abi_long host_to_target_stat64(void *cpu_env,
abi_ulong target_addr,
@ -9403,7 +9429,6 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
/* args: clockid_t clockid, struct sigevent *sevp, timer_t *timerid */
struct sigevent host_sevp = { {0}, }, *phost_sevp = NULL;
struct target_sigevent *ptarget_sevp;
struct target_timer_t *ptarget_timer;
int clkid = arg1;
@ -9415,14 +9440,11 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
timer_t *phtimer = g_posix_timers + timer_index;
if (arg2) {
if (!lock_user_struct(VERIFY_READ, ptarget_sevp, arg2, 1)) {
goto efault;
}
host_sevp.sigev_signo = tswap32(ptarget_sevp->sigev_signo);
host_sevp.sigev_notify = tswap32(ptarget_sevp->sigev_notify);
phost_sevp = &host_sevp;
ret = target_to_host_sigevent(phost_sevp, arg2);
if (ret != 0) {
break;
}
}
ret = get_errno(timer_create(clkid, phost_sevp, phtimer));