Subject: Re: RFC: Change SWI number base?
To: Ben Harris <bjh21@netbsd.org>
From: Richard Earnshaw <rearnsha@arm.com>
List: port-arm
Date: 01/04/2002 12:21:43 
> 
> 	str	r3, [sp, #-4]!
> 	mov	r3, r2
> 	mov	r2, r1
> 	mov	r1, r0
> 	mov	r0, #SYS_foo
> 	swi	SYS_syscall
> 	bcs	__cerror
> 	mov	pc, lr

Actually, a better code sequence would probably be

Sys_N:
	ldr	ip, =SYS_N
	b	__syscall_common
	.pool


__syscall_common:
	str	r3, [sp, #-4]!
	mov	r3, r2
	mov	r2, r1
	mov	r1, r0
	mov	r0, ip
	swi	0
	add	sp, sp, #4
	movcc	pc, lr
__cerror:
	...