| Stephen Rothwell | 127efeb | 2006-06-28 11:55:49 +1000 | [diff] [blame] | 1 | /* |
| 2 | * This file contains miscellaneous low-level functions. |
| 3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| 4 | * |
| 5 | * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) |
| 6 | * and Paul Mackerras. |
| 7 | * |
| 8 | * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) |
| 9 | * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License |
| 13 | * as published by the Free Software Foundation; either version |
| 14 | * 2 of the License, or (at your option) any later version. |
| 15 | */ |
| 16 | #include <asm/ppc_asm.h> |
| Stephen Rothwell | 94b146c | 2007-11-28 11:13:02 +1100 | [diff] [blame^] | 17 | #include <asm/unistd.h> |
| Stephen Rothwell | 127efeb | 2006-06-28 11:55:49 +1000 | [diff] [blame] | 18 | |
| 19 | .text |
| 20 | |
| Stephen Rothwell | 127efeb | 2006-06-28 11:55:49 +1000 | [diff] [blame] | 21 | /* |
| 22 | * Returns (address we are running at) - (address we were linked at) |
| 23 | * for use before the text and data are mapped to KERNELBASE. |
| 24 | */ |
| 25 | |
| 26 | _GLOBAL(reloc_offset) |
| 27 | mflr r0 |
| 28 | bl 1f |
| 29 | 1: mflr r3 |
| 30 | LOAD_REG_IMMEDIATE(r4,1b) |
| 31 | subf r3,r4,r3 |
| 32 | mtlr r0 |
| 33 | blr |
| 34 | |
| 35 | /* |
| 36 | * add_reloc_offset(x) returns x + reloc_offset(). |
| 37 | */ |
| 38 | _GLOBAL(add_reloc_offset) |
| 39 | mflr r0 |
| 40 | bl 1f |
| 41 | 1: mflr r5 |
| 42 | LOAD_REG_IMMEDIATE(r4,1b) |
| 43 | subf r5,r4,r5 |
| 44 | add r3,r3,r5 |
| 45 | mtlr r0 |
| 46 | blr |
| Stephen Rothwell | 94b146c | 2007-11-28 11:13:02 +1100 | [diff] [blame^] | 47 | |
| 48 | _GLOBAL(kernel_execve) |
| 49 | li r0,__NR_execve |
| 50 | sc |
| 51 | bnslr |
| 52 | neg r3,r3 |
| 53 | blr |