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[PATCH v8 3/4] linux-user: Support futex_time64
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From: |
Alistair Francis |
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Subject: |
[PATCH v8 3/4] linux-user: Support futex_time64 |
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Date: |
Fri, 13 Mar 2020 16:56:53 -0700 |
Add support for host and target futex_time64. If futex_time64 exists on
the host we try that first before falling back to the standard futux
syscall.
Signed-off-by: Alistair Francis <address@hidden>
---
linux-user/syscall.c | 144 +++++++++++++++++++++++++++++++++++++++----
1 file changed, 131 insertions(+), 13 deletions(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 60fd775d9c..b3bfb02688 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -245,7 +245,12 @@ static type name (type1 arg1,type2 arg2,type3 arg3,type4
arg4,type5 arg5, \
#define __NR_sys_rt_sigqueueinfo __NR_rt_sigqueueinfo
#define __NR_sys_rt_tgsigqueueinfo __NR_rt_tgsigqueueinfo
#define __NR_sys_syslog __NR_syslog
-#define __NR_sys_futex __NR_futex
+#if defined(__NR_futex)
+# define __NR_sys_futex __NR_futex
+#endif
+#if defined(__NR_futex_time64)
+# define __NR_sys_futex_time64 __NR_futex_time64
+#endif
#define __NR_sys_inotify_init __NR_inotify_init
#define __NR_sys_inotify_add_watch __NR_inotify_add_watch
#define __NR_sys_inotify_rm_watch __NR_inotify_rm_watch
@@ -295,10 +300,16 @@ _syscall1(int,exit_group,int,error_code)
#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)
_syscall1(int,set_tid_address,int *,tidptr)
#endif
-#if defined(TARGET_NR_futex) && defined(__NR_futex)
+#if (defined(TARGET_NR_futex) && defined(__NR_futex)) || \
+ (defined(TARGET_NR_futex_time64) && \
+ (HOST_LONG_BITS == 64 && defined(__NR_futex)))
_syscall6(int,sys_futex,int *,uaddr,int,op,int,val,
const struct timespec *,timeout,int *,uaddr2,int,val3)
#endif
+#if (defined(TARGET_NR_futex_time64) && defined(__NR_futex_teim64))
+_syscall6(int,sys_futex_time64,int *,uaddr,int,op,int,val,
+ const struct timespec *,timeout,int *,uaddr2,int,val3)
+#endif
#define __NR_sys_sched_getaffinity __NR_sched_getaffinity
_syscall3(int, sys_sched_getaffinity, pid_t, pid, unsigned int, len,
unsigned long *, user_mask_ptr);
@@ -762,10 +773,14 @@ safe_syscall5(int, ppoll, struct pollfd *, ufds, unsigned
int, nfds,
safe_syscall6(int, epoll_pwait, int, epfd, struct epoll_event *, events,
int, maxevents, int, timeout, const sigset_t *, sigmask,
size_t, sigsetsize)
-#ifdef TARGET_NR_futex
+#if defined(__NR_futex)
safe_syscall6(int,futex,int *,uaddr,int,op,int,val, \
const struct timespec *,timeout,int *,uaddr2,int,val3)
#endif
+#if defined(__NR_futex_time64)
+safe_syscall6(int,futex_time64,int *,uaddr,int,op,int,val, \
+ const struct timespec *,timeout,int *,uaddr2,int,val3)
+#endif
safe_syscall2(int, rt_sigsuspend, sigset_t *, newset, size_t, sigsetsize)
safe_syscall2(int, kill, pid_t, pid, int, sig)
safe_syscall2(int, tkill, int, tid, int, sig)
@@ -1229,7 +1244,7 @@ static inline abi_long target_to_host_timespec(struct
timespec *host_ts,
}
#endif
-#if defined(TARGET_NR_clock_settime64)
+#if defined(TARGET_NR_clock_settime64) || defined(TARGET_NR_futex_time64)
static inline abi_long target_to_host_timespec64(struct timespec *host_ts,
abi_ulong target_addr)
{
@@ -6890,6 +6905,55 @@ static inline abi_long host_to_target_statx(struct
target_statx *host_stx,
}
#endif
+static int do_sys_futex(int *uaddr, int op, int val,
+ const struct timespec *timeout, int *uaddr2,
+ int val3)
+{
+#if HOST_LONG_BITS == 64
+#if defined(__NR_futex)
+ /* always a 64-bit time_t, it doesn't define _time64 version */
+ return sys_futex(uaddr, op, val, timeout, uaddr2, val3);
+
+#endif
+#else /* HOST_LONG_BITS == 64 */
+#if defined(__NR_futex_time64)
+ if (sizeof(timeout->tv_sec) == 8) {
+ /* _time64 function on 32bit arch */
+ return sys_futex_time64(uaddr, op, val, timeout, uaddr2, val3);
+ }
+#endif
+#if defined(__NR_futex)
+ /* old function on 32bit arch */
+ return sys_futex(uaddr, op, val, timeout, uaddr2, val3);
+#endif
+#endif /* HOST_LONG_BITS == 64 */
+ g_assert_not_reached();
+}
+
+static int do_safe_futex(int *uaddr, int op, int val,
+ const struct timespec *timeout, int *uaddr2,
+ int val3)
+{
+#if HOST_LONG_BITS == 64
+#if defined(__NR_futex)
+ /* always a 64-bit time_t, it doesn't define _time64 version */
+ return get_errno(safe_futex(uaddr, op, val, timeout, uaddr2, val3));
+#endif
+#else /* HOST_LONG_BITS == 64 */
+#if defined(__NR_futex_time64)
+ if (sizeof(timeout->tv_sec) == 8) {
+ /* _time64 function on 32bit arch */
+ return get_errno(safe_futex_time64(uaddr, op, val, timeout, uaddr2,
+ val3));
+ }
+#endif
+#if defined(__NR_futex)
+ /* old function on 32bit arch */
+ return get_errno(safe_futex(uaddr, op, val, timeout, uaddr2, val3));
+#endif
+#endif /* HOST_LONG_BITS == 64 */
+ return -TARGET_ENOSYS;
+}
/* ??? Using host futex calls even when target atomic operations
are not really atomic probably breaks things. However implementing
@@ -6919,12 +6983,61 @@ static int do_futex(target_ulong uaddr, int op, int
val, target_ulong timeout,
} else {
pts = NULL;
}
- return get_errno(safe_futex(g2h(uaddr), op, tswap32(val),
+ return get_errno(do_safe_futex(g2h(uaddr), op, tswap32(val),
+ pts, NULL, val3));
+ case FUTEX_WAKE:
+ return get_errno(do_safe_futex(g2h(uaddr), op, val, NULL, NULL, 0));
+ case FUTEX_FD:
+ return get_errno(do_safe_futex(g2h(uaddr), op, val, NULL, NULL, 0));
+ case FUTEX_REQUEUE:
+ case FUTEX_CMP_REQUEUE:
+ case FUTEX_WAKE_OP:
+ /* For FUTEX_REQUEUE, FUTEX_CMP_REQUEUE, and FUTEX_WAKE_OP, the
+ TIMEOUT parameter is interpreted as a uint32_t by the kernel.
+ But the prototype takes a `struct timespec *'; insert casts
+ to satisfy the compiler. We do not need to tswap TIMEOUT
+ since it's not compared to guest memory. */
+ pts = (struct timespec *)(uintptr_t) timeout;
+ return get_errno(do_safe_futex(g2h(uaddr), op, val, pts,
+ g2h(uaddr2),
+ (base_op == FUTEX_CMP_REQUEUE
+ ? tswap32(val3)
+ : val3)));
+ default:
+ return -TARGET_ENOSYS;
+ }
+}
+#endif
+
+#if defined(TARGET_NR_futex_time64)
+static int do_futex_time64(target_ulong uaddr, int op, int val, target_ulong
timeout,
+ target_ulong uaddr2, int val3)
+{
+ struct timespec ts, *pts;
+ int base_op;
+
+ /* ??? We assume FUTEX_* constants are the same on both host
+ and target. */
+#ifdef FUTEX_CMD_MASK
+ base_op = op & FUTEX_CMD_MASK;
+#else
+ base_op = op;
+#endif
+ switch (base_op) {
+ case FUTEX_WAIT:
+ case FUTEX_WAIT_BITSET:
+ if (timeout) {
+ pts = &ts;
+ target_to_host_timespec64(pts, timeout);
+ } else {
+ pts = NULL;
+ }
+ return get_errno(do_safe_futex(g2h(uaddr), op, tswap32(val),
pts, NULL, val3));
case FUTEX_WAKE:
- return get_errno(safe_futex(g2h(uaddr), op, val, NULL, NULL, 0));
+ return get_errno(do_safe_futex(g2h(uaddr), op, val, NULL, NULL, 0));
case FUTEX_FD:
- return get_errno(safe_futex(g2h(uaddr), op, val, NULL, NULL, 0));
+ return get_errno(do_safe_futex(g2h(uaddr), op, val, NULL, NULL, 0));
case FUTEX_REQUEUE:
case FUTEX_CMP_REQUEUE:
case FUTEX_WAKE_OP:
@@ -6934,16 +7047,17 @@ static int do_futex(target_ulong uaddr, int op, int
val, target_ulong timeout,
to satisfy the compiler. We do not need to tswap TIMEOUT
since it's not compared to guest memory. */
pts = (struct timespec *)(uintptr_t) timeout;
- return get_errno(safe_futex(g2h(uaddr), op, val, pts,
- g2h(uaddr2),
- (base_op == FUTEX_CMP_REQUEUE
- ? tswap32(val3)
- : val3)));
+ return get_errno(do_safe_futex(g2h(uaddr), op, val, pts,
+ g2h(uaddr2),
+ (base_op == FUTEX_CMP_REQUEUE
+ ? tswap32(val3)
+ : val3)));
default:
return -TARGET_ENOSYS;
}
}
#endif
+
#if defined(TARGET_NR_name_to_handle_at) && defined(CONFIG_OPEN_BY_HANDLE)
static abi_long do_name_to_handle_at(abi_long dirfd, abi_long pathname,
abi_long handle, abi_long mount_id,
@@ -7505,7 +7619,7 @@ static abi_long do_syscall1(void *cpu_env, int num,
abi_long arg1,
ts = cpu->opaque;
if (ts->child_tidptr) {
put_user_u32(0, ts->child_tidptr);
- sys_futex(g2h(ts->child_tidptr), FUTEX_WAKE, INT_MAX,
+ do_sys_futex(g2h(ts->child_tidptr), FUTEX_WAKE, INT_MAX,
NULL, NULL, 0);
}
thread_cpu = NULL;
@@ -11597,6 +11711,10 @@ static abi_long do_syscall1(void *cpu_env, int num,
abi_long arg1,
case TARGET_NR_futex:
return do_futex(arg1, arg2, arg3, arg4, arg5, arg6);
#endif
+#ifdef TARGET_NR_futex_time64
+ case TARGET_NR_futex_time64:
+ return do_futex_time64(arg1, arg2, arg3, arg4, arg5, arg6);
+#endif
#if defined(TARGET_NR_inotify_init) && defined(__NR_inotify_init)
case TARGET_NR_inotify_init:
ret = get_errno(sys_inotify_init());
--
2.25.1