ack/plat/linuxppc/boot.s

#
! $Source: /cvsroot/tack/Ack/plat/linux386/boot.s,v $
! $State: Exp $
! $Revision: 1.3 $

! Declare segments (the order is important).

.sect .text
.sect .rom
.sect .data
.sect .bss

.sect .text

begtext:
	! This code is placed at the beginning of the ELF executable and is the
	! first thing that runs.
	!
	! On entry, the stack looks like this:
	!
	! sp+...          NULL
	! sp+8+(4*argc)   env (X quads)
	! sp+4+(4*argc)   NULL
	! sp+4            argv (argc quads)
	! sp              argc
	!
	! The ACK actually expects:
	!
	! sp+8            argc
	! sp+4            ptr to argv
	! sp              ptr to env

	lwz r3, 0(sp)            ! r3 = argc
	addi r4, sp, 4           ! r4 = argv
	srwi r5, r3, 2
	add r5, r5, r4 
	addi r5, r5, 8           ! r5 = env
	
	stwu r5, -4(sp)
	stwu r4, -4(sp)
	stwu r3, -4(sp)
	
	b __m_a_i_n

! Define symbols at the beginning of our various segments, so that we can find
! them. (Except .text, which has already been done.)

.sect .data;       begdata:
.sect .rom;        begrom:
.sect .bss;        begbss:

! Some magic data. All EM systems need these.

.define _errno
.comm _errno, 4              ! Posix errno storage

.define .trppc, .ignmask
.comm .trppc, 4              ! ptr to user trap handler
.comm .ignmask, 4            ! user trap ignore mask