Date: Thu, 13 Nov 2025 14:01:37 -0800 From: Mark Millard <marklmi@yahoo.com> To: FreeBSD Current <freebsd-current@freebsd.org>, FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>, freebsd-arm <freebsd-arm@freebsd.org> Subject: native armv7 for struct aiocb offsets and overall size vs. aarch64 for struct aiocb32 offsets and overall size: most fields do not match Message-ID: <DAFD5865-AEBF-43F3-918C-E3AFD6B9D36F@yahoo.com>
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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.comhome | help
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