diff options
Diffstat (limited to 'usr/src/lib/libdtrace/common/dt_subr.c')
| -rw-r--r-- | usr/src/lib/libdtrace/common/dt_subr.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/usr/src/lib/libdtrace/common/dt_subr.c b/usr/src/lib/libdtrace/common/dt_subr.c index e93617ef59..1958e62f82 100644 --- a/usr/src/lib/libdtrace/common/dt_subr.c +++ b/usr/src/lib/libdtrace/common/dt_subr.c @@ -22,6 +22,7 @@ /* * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 2012 by Delphix. All rights reserved. + * Copyright 2022 Oxide Computer Company */ #include <sys/sysmacros.h> @@ -909,3 +910,25 @@ dtrace_uaddr2str(dtrace_hdl_t *dtp, pid_t pid, return (dt_string2str(c, str, nbytes)); } + +/* + * This is a shared implementation to determine if we should treat a type as a + * bitfield. The parameters are the CTF encoding and the bit offset of the + * integer. This also exists in mdb_print.c. We consider something a bitfield + * if: + * + * o The type is more than 8 bytes. This is a bit of a historical choice from + * mdb and is a stranger one. The normal integer handling code generally + * doesn't handle integers more than 64-bits in size. Of course neither does + * the bitfield code... + * o The bit count is not a multiple of 8. + * o The size in bytes is not a power of 2. + * o The offset is not a multiple of 8. + */ +boolean_t +dt_is_bitfield(const ctf_encoding_t *ep, ulong_t off) +{ + size_t bsize = ep->cte_bits / NBBY; + return (bsize > 8 || (ep->cte_bits % NBBY) != 0 || + (bsize & (bsize - 1)) != 0 || (off % NBBY) != 0); +} |