kern/58746: aarch64 compat_netbsd32_16: Exec format error

[mlelstv%netbsd.org@localhost]

>Number:         58746
>Category:       kern
>Synopsis:       aarch64 compat_netbsd32_16: Exec format error
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 12 13:25:00 +0000 2024
>Originator:     Michael van Elst
>Release:        NetBSD 10.0_STABLE
>Organization:
	
>Environment:
	
	
System: NetBSD victory.netbsd.org 10.0_STABLE NetBSD 10.0_STABLE (VICTORY) #5: Sat Oct 12 07:26:49 UTC 2024 spz%franklin.NetBSD.org@localhost:/home/netbsd/10/evbarm-aarch64/obj/sys/arch/evbarm/compile/VICTORY evbarm
Architecture: aarch64
Machine: evbarm
>Description:
Running 32bit code in a netbsd-9 chroot on netbsd-10 (or -current)
requires COMPAT_16.

On aarch64 this fails. A kernel with COMPAT_16 doesn't build
and the compatibility module fails to load with the error:

compat_netbsd32_16: Exec format error

and dmesg entries showing missing symbols:
[     8.816073] kobj_checksyms, 1004: [compat_16]: linker error: symbol `sendsig_sigcontext' not found
[     8.826074] kobj_checksyms, 1004: [compat_16]: linker error: symbol `esigcode' not found
[     8.836073] kobj_checksyms, 1004: [compat_16]: linker error: symbol `compat_16_sys___sigreturn14' not found
[     8.846073] kobj_checksyms, 1004: [compat_16]: linker error: symbol `sigcode' not found

>How-To-Repeat:
Try to bulk build python312 for netbsd-9/earmv{6,7}hf on aarch64.
>Fix:
	

>Unformatted: