tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) Paul Mackerras 1997.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * NOTE: this code runs in 32 bit mode and is packaged as ELF32.
10 */
11
12#include "ppc_asm.h"
13
14 .text
15 /* a procedure descriptor used when booting this as a COFF file */
16_zimage_start_opd:
17 .long _zimage_start, 0, 0, 0
18
19 .globl _zimage_start
20_zimage_start:
21 /* Work out the offset between the address we were linked at
22 and the address where we're running. */
23 bl 1f
241: mflr r0
25 lis r9,1b@ha
26 addi r9,r9,1b@l
27 subf. r0,r9,r0
28 beq 3f /* if running at same address as linked */
29
30 /* The .got2 section contains a list of addresses, so add
31 the address offset onto each entry. */
32 lis r9,__got2_start@ha
33 addi r9,r9,__got2_start@l
34 lis r8,__got2_end@ha
35 addi r8,r8,__got2_end@l
36 subf. r8,r9,r8
37 beq 3f
38 srwi. r8,r8,2
39 mtctr r8
40 add r9,r0,r9
412: lwz r8,0(r9)
42 add r8,r8,r0
43 stw r8,0(r9)
44 addi r9,r9,4
45 bdnz 2b
46
47 /* Do a cache flush for our text, in case OF didn't */
483: lis r9,_start@ha
49 addi r9,r9,_start@l
50 add r9,r0,r9
51 lis r8,_etext@ha
52 addi r8,r8,_etext@l
53 add r8,r0,r8
544: dcbf r0,r9
55 icbi r0,r9
56 addi r9,r9,0x20
57 cmplw cr0,r9,r8
58 blt 4b
59 sync
60 isync
61
62 mr r6,r1
63 b start
64