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1da177e4 LT |
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 | ||
decd300b | 12 | #include "ppc_asm.h" |
1da177e4 LT |
13 | |
14 | .text | |
66a45dd3 PM |
15 | /* a procedure descriptor used when booting this as a COFF file */ |
16 | _zimage_start_opd: | |
17 | .long _zimage_start, 0, 0, 0 | |
18 | ||
67a1b682 OH |
19 | .globl _zimage_start |
20 | _zimage_start: | |
66a45dd3 PM |
21 | /* Work out the offset between the address we were linked at |
22 | and the address where we're running. */ | |
68643cfb | 23 | bl 1f |
66a45dd3 | 24 | 1: mflr r0 |
68643cfb OH |
25 | lis r9,1b@ha |
26 | addi r9,r9,1b@l | |
a4497235 | 27 | subf. r0,r9,r0 |
66a45dd3 | 28 | beq 3f /* if running at same address as linked */ |
a4497235 | 29 | |
66a45dd3 PM |
30 | /* The .got2 section contains a list of addresses, so add |
31 | the address offset onto each entry. */ | |
a4497235 OH |
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 | |
68643cfb | 37 | beq 3f |
a4497235 OH |
38 | srwi. r8,r8,2 |
39 | mtctr r8 | |
40 | add r9,r0,r9 | |
66a45dd3 | 41 | 2: lwz r8,0(r9) |
a4497235 OH |
42 | add r8,r8,r0 |
43 | stw r8,0(r9) | |
44 | addi r9,r9,4 | |
68643cfb | 45 | bdnz 2b |
a4497235 | 46 | |
66a45dd3 PM |
47 | /* Do a cache flush for our text, in case OF didn't */ |
48 | 3: lis r9,_start@h | |
a4497235 | 49 | add r9,r0,r9 |
1da177e4 LT |
50 | lis r8,_etext@ha |
51 | addi r8,r8,_etext@l | |
a4497235 | 52 | add r8,r0,r8 |
68643cfb | 53 | 4: dcbf r0,r9 |
1da177e4 LT |
54 | icbi r0,r9 |
55 | addi r9,r9,0x20 | |
56 | cmplwi 0,r9,8 | |
68643cfb | 57 | blt 4b |
1da177e4 LT |
58 | sync |
59 | isync | |
60 | ||
7e658118 | 61 | mr r6,r1 |
1da177e4 LT |
62 | b start |
63 |