Merge the fueword(9) and casueword(9). In particular,

MFC r273783:
Add fueword(9) and casueword(9) functions.
MFC note: ia64 is handled like arm, with NO_FUEWORD define.

MFC r273784:
Replace some calls to fuword() by fueword() with proper error checking.

MFC r273785:
Convert kern_umtx.c to use fueword() and casueword().
MFC note: the sys__umtx_lock and sys__umtx_unlock syscalls are not
converted, they are removed from HEAD, and not used.  The do_sem2*()
family is not yet merged to stable/10, corresponding chunk will be
merged after do_sem2* are committed.

MFC r273788 (by jkim):
Actually install casuword(9) to fix build.

MFC r273911:
Add type qualifier volatile to the base (userspace) address argument
of fuword(9) and suword(9).

1 files changed, 18 insertions, 11 deletions

diff --git a/sys/sys/systm.h b/sys/sys/systm.h
index c484b7b..0542535 100644
--- a/sys/sys/systm.h
+++ b/sys/sys/systm.h
@@ -251,18 +251,25 @@ int	copyout(const void * __restrict kaddr, void * __restrict udaddr,
 int	copyout_nofault(const void * __restrict kaddr, void * __restrict udaddr,
 	    size_t len) __nonnull(1) __nonnull(2);
 
-int	fubyte(const void *base);
-long	fuword(const void *base);
-int	fuword16(void *base);
-int32_t	fuword32(const void *base);
-int64_t	fuword64(const void *base);
-int	subyte(void *base, int byte);
-int	suword(void *base, long word);
-int	suword16(void *base, int word);
-int	suword32(void *base, int32_t word);
-int	suword64(void *base, int64_t word);
+int	fubyte(volatile const void *base);
+long	fuword(volatile const void *base);
+int	fuword16(volatile const void *base);
+int32_t	fuword32(volatile const void *base);
+int64_t	fuword64(volatile const void *base);
+int	fueword(volatile const void *base, long *val);
+int	fueword32(volatile const void *base, int32_t *val);
+int	fueword64(volatile const void *base, int64_t *val);
+int	subyte(volatile void *base, int byte);
+int	suword(volatile void *base, long word);
+int	suword16(volatile void *base, int word);
+int	suword32(volatile void *base, int32_t word);
+int	suword64(volatile void *base, int64_t word);
 uint32_t casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval);
-u_long	 casuword(volatile u_long *p, u_long oldval, u_long newval);
+u_long	casuword(volatile u_long *p, u_long oldval, u_long newval);
+int	casueword32(volatile uint32_t *base, uint32_t oldval, uint32_t *oldvalp,
+	    uint32_t newval);
+int	casueword(volatile u_long *p, u_long oldval, u_long *oldvalp,
+	    u_long newval);
 
 void	realitexpire(void *);