|
| copy binary image and execute
|
| written by ITOH Yasufumi
| public domain
|
| $NetBSD: trampoline.S,v 1.3 2011/02/21 02:31:59 itohy Exp $
#include <machine/asm.h>
#include "trampoline.h"
| arg+0 bsr trampoline
| +4 %a3+0 temporary stack address
| +8 %a3+4 processor type
| +12 %a3+8 struct execkern_arg
| +52 trampoline
ENTRY_NOPROFILE(trampoline)
oriw #0x0700,%sr | keep out interrupts
moveal %sp@+,%a3
moveal %a3@+,%sp | set temporary stack
movel %a3@+,%d2 | MPU type
|
| turn off MMU
|
moveq #MPU_68030,%d0
cmpl %d2,%d0
bccs Lmmu030
| 040/060
moveq #0,%d0
.long 0x4E7B0003 | movec %d0,%tc
.long 0x4E7B0004 | movec %d0,%itt0
.long 0x4E7B0005 | movec %d0,%itt1
.long 0x4E7B0006 | movec %d0,%dtt0
.long 0x4E7B0007 | movec %d0,%dtt1
.long 0x4E7B0806 | movec %d0,%urp
.long 0x4E7B0807 | movec %d0,%srp
bras Lmmudone
Lmmu030:
| 020/030
clrl %sp@-
.long 0xF0174000 | pmove %sp@,%tc
cmpl %d0,%d2
bnes Lmmu020 | 68851 has no tt regs
.long 0xF0170800 | pmove %sp@,%tt0
.long 0xF0170C00 | pmove %sp@,%tt1
Lmmu020:
movel #0x7fff0001,%sp@- | null root pointer
.long 0xF0174C00 | pmove %sp@,%crp
.long 0xF0174800 | pmove %sp@,%srp
addql #8,%sp
Lmmudone:
| minimize supervisor protection
clrb AREA_SET_REG
| reset VBR (for compatibility)
subal %a1,%a1
.long 0x4E7B9801 | movec %a1,%vbr
| then transfer and exec kernel
#define XK_NO_C_INTERFACE /* pass arg with %a3 */
#include "../common/execkern.S"
GLOBAL(end_trampoline)
