89 lines
1.7 KiB
ArmAsm
89 lines
1.7 KiB
ArmAsm
#
|
|
! $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
|
|
|
|
li32 r3, __openfirmware_ptr
|
|
stw r5, 0(r3)
|
|
|
|
li32 r3, envp
|
|
stwu r3, -4(sp)
|
|
|
|
li32 r3, argv
|
|
stwu r3, -4(sp)
|
|
|
|
li32 r3, 1 ! argc
|
|
stwu r3, -4(sp)
|
|
|
|
bl _openfirmware_init
|
|
bl __m_a_i_n
|
|
! falls through
|
|
|
|
.define __exit
|
|
.extern __exit
|
|
.define EXIT
|
|
.extern EXIT
|
|
__exit:
|
|
EXIT:
|
|
b EXIT
|
|
|
|
.define _openfirmware_call
|
|
.extern _openfirmware_call
|
|
_openfirmware_call:
|
|
lwz r3, 0(sp)
|
|
li32 r4, __openfirmware_ptr
|
|
lwz r4, 0(r4)
|
|
mtspr ctr, r4
|
|
bcctr 20, 0, 0
|
|
|
|
! 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
|
|
|
|
! The argv and env arrays.
|
|
|
|
.sect .rom
|
|
argv: .data4 exename, 0
|
|
envp: .data4 0
|
|
exename: .asciz 'qemuppc.img'
|
|
|
|
.define .trppc, .ignmask
|
|
.comm .trppc, 4 ! ptr to user trap handler
|
|
.comm .ignmask, 4 ! user trap ignore mask
|
|
.comm __openfirmware_ptr, 4 ! OpenFirmware entry point
|