Re: CVS commit: src/sys

[Rin Okuyama <rokuyama.rk%gmail.com@localhost>]

On 2020/11/05 5:43, Paul Goyette wrote:
> BTW, the patch you submitted with the initial message in this thread
> looks good for avoiding the issue.  But I'm not sure it is a complete
> solution.
>
> In particular, you would need to build a 32-bit arm that contains ``no
> options COMPAT_NETBSD32'' and then boot and load the compat_netbsd32
> and compat_netbsd32_coredump modules
>
>      modload compat_netbsd32
>      modload compat_netbsd32_coredump
>
> Then see if emulation of the old ABI still works, and check if core-
> dump works for old-ADI programs; the test program I've been using for
> core-dump checking is
>
>      #include <stdlib.h>
>      int main(int argc, void *argv) { abort(); }
>
> I really have to leave and take care of some personal business, so I
> would greatly appreciate if you can check this out.

Hmm, ``modload compat_netbsd32'' does not work on evbarmv6hf-el:

----
# uname -ap
NetBSD  9.99.75 NetBSD 9.99.75 (RPI0) #11: Thu Nov  5 20:26:39 JST 2020  rin@latipes:/sys/arch/evbarm/compile/RPI0 evbarm earmv6hf
# modload compat_netbsd32
[  29.6328410] kobj_checksyms, 994: [compat_netbsd32]: linker error: symbol `netbsd32_vm_default_addr' not found
[  29.6460400] kobj_checksyms, 994: [compat_netbsd32]: linker error: symbol `netbsd32_machdep_md_init' not found
[  29.6560750] kobj_checksyms, 994: [compat_netbsd32]: linker error: symbol `netbsd32_sendsig' not found
[  29.6661200] kobj_checksyms, 994: [compat_netbsd32]: linker error: symbol `cpu_mcontext32_validate' not found
[  29.6791570] kobj_checksyms, 994: [compat_netbsd32]: linker error: symbol `cpu_setmcontext32' not found
[  29.6791570] kobj_checksyms, 994: [compat_netbsd32]: linker error: symbol `netbsd32_machdep_md_fini' not found
[  29.6948370] kobj_checksyms, 994: [compat_netbsd32]: linker error: symbol `startlwp32' not found
[  29.7048770] kobj_checksyms, 994: [compat_netbsd32]: linker error: symbol `cpu_getmcontext32' not found
[  29.7168550] kobj_checksyms, 994: [compat_netbsd32]: linker error: symbol `machine32' not found
[  29.7168550] kobj_checksyms, 994: [compat_netbsd32]: linker error: symbol `netbsd32_sysarch' not found
[  29.7318320] WARNING: module error: unable to affix module `compat_netbsd32', error 8
modload: compat_netbsd32: Exec format error
----

This should be because there are ``#ifdef COMPAT_NETBSD32'' codes in files
not included in compat_netbsd32 module. compat_netbsd32 module must not
work also for aarch64 and mips64 for the same reason, whereas amd64 and
sparc64 seem OK.

Thanks,
rin