| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| Olaf Hering | decd300 | 2005-08-08 13:24:38 +1000 | [diff] [blame] | 12 | #include "ppc_asm.h" |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
| 14 | .text |
| Paul Mackerras | 66a45dd | 2006-01-14 15:04:06 +1100 | [diff] [blame^] | 15 | /* a procedure descriptor used when booting this as a COFF file */ |
| 16 | _zimage_start_opd: |
| 17 | .long _zimage_start, 0, 0, 0 |
| 18 | |
| Olaf Hering | 67a1b68 | 2005-10-28 17:46:49 -0700 | [diff] [blame] | 19 | .globl _zimage_start |
| 20 | _zimage_start: |
| Paul Mackerras | 66a45dd | 2006-01-14 15:04:06 +1100 | [diff] [blame^] | 21 | /* Work out the offset between the address we were linked at |
| 22 | and the address where we're running. */ |
| Olaf Hering | 68643cf | 2005-11-17 22:09:02 +0100 | [diff] [blame] | 23 | bl 1f |
| Paul Mackerras | 66a45dd | 2006-01-14 15:04:06 +1100 | [diff] [blame^] | 24 | 1: mflr r0 |
| Olaf Hering | 68643cf | 2005-11-17 22:09:02 +0100 | [diff] [blame] | 25 | lis r9,1b@ha |
| 26 | addi r9,r9,1b@l |
| Olaf Hering | a449723 | 2005-10-28 17:46:48 -0700 | [diff] [blame] | 27 | subf. r0,r9,r0 |
| Paul Mackerras | 66a45dd | 2006-01-14 15:04:06 +1100 | [diff] [blame^] | 28 | beq 3f /* if running at same address as linked */ |
| Olaf Hering | a449723 | 2005-10-28 17:46:48 -0700 | [diff] [blame] | 29 | |
| Paul Mackerras | 66a45dd | 2006-01-14 15:04:06 +1100 | [diff] [blame^] | 30 | /* The .got2 section contains a list of addresses, so add |
| 31 | the address offset onto each entry. */ |
| Olaf Hering | a449723 | 2005-10-28 17:46:48 -0700 | [diff] [blame] | 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 |
| Olaf Hering | 68643cf | 2005-11-17 22:09:02 +0100 | [diff] [blame] | 37 | beq 3f |
| Olaf Hering | a449723 | 2005-10-28 17:46:48 -0700 | [diff] [blame] | 38 | srwi. r8,r8,2 |
| 39 | mtctr r8 |
| 40 | add r9,r0,r9 |
| Paul Mackerras | 66a45dd | 2006-01-14 15:04:06 +1100 | [diff] [blame^] | 41 | 2: lwz r8,0(r9) |
| Olaf Hering | a449723 | 2005-10-28 17:46:48 -0700 | [diff] [blame] | 42 | add r8,r8,r0 |
| 43 | stw r8,0(r9) |
| 44 | addi r9,r9,4 |
| Olaf Hering | 68643cf | 2005-11-17 22:09:02 +0100 | [diff] [blame] | 45 | bdnz 2b |
| Olaf Hering | a449723 | 2005-10-28 17:46:48 -0700 | [diff] [blame] | 46 | |
| Paul Mackerras | 66a45dd | 2006-01-14 15:04:06 +1100 | [diff] [blame^] | 47 | /* Do a cache flush for our text, in case OF didn't */ |
| 48 | 3: lis r9,_start@h |
| Olaf Hering | a449723 | 2005-10-28 17:46:48 -0700 | [diff] [blame] | 49 | add r9,r0,r9 |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | lis r8,_etext@ha |
| 51 | addi r8,r8,_etext@l |
| Olaf Hering | a449723 | 2005-10-28 17:46:48 -0700 | [diff] [blame] | 52 | add r8,r0,r8 |
| Olaf Hering | 68643cf | 2005-11-17 22:09:02 +0100 | [diff] [blame] | 53 | 4: dcbf r0,r9 |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | icbi r0,r9 |
| 55 | addi r9,r9,0x20 |
| 56 | cmplwi 0,r9,8 |
| Olaf Hering | 68643cf | 2005-11-17 22:09:02 +0100 | [diff] [blame] | 57 | blt 4b |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | sync |
| 59 | isync |
| 60 | |
| Olaf Hering | 7e65811 | 2005-10-28 17:46:50 -0700 | [diff] [blame] | 61 | mr r6,r1 |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | b start |
| 63 | |