From Newsgroup: muc.lists.freebsd.stable

The evidence is copied from:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290962#c8

which I just added there. Title (but line-split) for the
bugzilla submital was:

armv7 chroot and lib32 use on aarch64: example fio command
works on real armv7 system boots but fails for aarch64-to-armv7
chroot or lib32 use


The evidence:

kgdb on armv7 for struct aiocb offsets vs.
kgdb on aarch64 for struct aiocb32 offsets
(through first few differences):

kgdb on armv7 for struct aiocb offsets :

(kgdb) ptype /o *(struct aiocb*)0
/* offset | size */ type = struct aiocb {
/* 0 | 4 */ int aio_fildes;
/* XXX 4-byte hole */
/* 8 | 8 */ off_t aio_offset;
/* 16 | 4 */ volatile void *aio_buf;
/* 20 | 4 */ size_t aio_nbytes;
. . .
/* total size (bytes): 104 */

vs.:

kgdb on aarch64 for struct aiocb32 offsets :

(kgdb) ptype /o *(struct aiocb32*)0
/* offset | size */ type = struct aiocb32 {
/* 0 | 4 */ int32_t aio_fildes;
/* 4 | 8 */ uint64_t aio_offset;
/* 12 | 4 */ uint32_t aio_buf;
/* 16 | 4 */ uint32_t aio_nbytes;
. . .
/* total size (bytes): 96 */

===
Mark Millard
marklmi at yahoo.com



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