Subject: Re: m88k system call convention
To: None <firstname.lastname@example.org>
From: Toru Nishimura <email@example.com>
Date: 02/09/2000 13:26:36
>> - LUNA Mach2.5
>> issue "tb0 0,r0,128" after storing the system call number in r9.
>> - OpenBSD/m88k
>> issue "tb0 0,r0,128" after storing the first 3 argments in r10,r11,r12,
>> and system call number in r13.
> I guess the question boils down to: what is the normal function calling
> convention for the m88k?
Further research revealed my misunderstanding; it turned out OpenBSD
system call stab tries to save 9-11th args in r10-12 storing system
call number in r13.
r0 is hardwired zero, r1 for return address, and calling convention
defines r[2-9] for the first 8 arguments (double adjusts even/odd
pairs). So, either follows pass-args-on-regs scheme, with a glitch.
Binary compatiblity can be approached by 'struct emul', if ever. The
issue here is what 'NetBSD native m88k' should be. Any info from