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 | * |
Michael Neuling | c3b75bd | 2008-01-18 15:50:30 +1100 | [diff] [blame] | 11 | * setjmp/longjmp code by Paul Mackerras. |
| 12 | * |
Stephen Rothwell | 127efeb | 2006-06-28 11:55:49 +1000 | [diff] [blame] | 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License |
| 15 | * as published by the Free Software Foundation; either version |
| 16 | * 2 of the License, or (at your option) any later version. |
| 17 | */ |
| 18 | #include <asm/ppc_asm.h> |
Stephen Rothwell | 94b146c | 2007-11-28 11:13:02 +1100 | [diff] [blame] | 19 | #include <asm/unistd.h> |
Michael Neuling | c3b75bd | 2008-01-18 15:50:30 +1100 | [diff] [blame] | 20 | #include <asm/asm-compat.h> |
| 21 | #include <asm/asm-offsets.h> |
Stephen Rothwell | 127efeb | 2006-06-28 11:55:49 +1000 | [diff] [blame] | 22 | |
| 23 | .text |
| 24 | |
Stephen Rothwell | 127efeb | 2006-06-28 11:55:49 +1000 | [diff] [blame] | 25 | /* |
| 26 | * Returns (address we are running at) - (address we were linked at) |
| 27 | * for use before the text and data are mapped to KERNELBASE. |
| 28 | */ |
| 29 | |
| 30 | _GLOBAL(reloc_offset) |
| 31 | mflr r0 |
| 32 | bl 1f |
| 33 | 1: mflr r3 |
| 34 | LOAD_REG_IMMEDIATE(r4,1b) |
| 35 | subf r3,r4,r3 |
| 36 | mtlr r0 |
| 37 | blr |
| 38 | |
| 39 | /* |
| 40 | * add_reloc_offset(x) returns x + reloc_offset(). |
| 41 | */ |
| 42 | _GLOBAL(add_reloc_offset) |
| 43 | mflr r0 |
| 44 | bl 1f |
| 45 | 1: mflr r5 |
| 46 | LOAD_REG_IMMEDIATE(r4,1b) |
| 47 | subf r5,r4,r5 |
| 48 | add r3,r3,r5 |
| 49 | mtlr r0 |
| 50 | blr |
Stephen Rothwell | 94b146c | 2007-11-28 11:13:02 +1100 | [diff] [blame] | 51 | |
| 52 | _GLOBAL(kernel_execve) |
| 53 | li r0,__NR_execve |
| 54 | sc |
| 55 | bnslr |
| 56 | neg r3,r3 |
| 57 | blr |
Michael Neuling | c3b75bd | 2008-01-18 15:50:30 +1100 | [diff] [blame] | 58 | |
| 59 | _GLOBAL(setjmp) |
| 60 | mflr r0 |
| 61 | PPC_STL r0,0(r3) |
| 62 | PPC_STL r1,SZL(r3) |
| 63 | PPC_STL r2,2*SZL(r3) |
| 64 | mfcr r0 |
| 65 | PPC_STL r0,3*SZL(r3) |
| 66 | PPC_STL r13,4*SZL(r3) |
| 67 | PPC_STL r14,5*SZL(r3) |
| 68 | PPC_STL r15,6*SZL(r3) |
| 69 | PPC_STL r16,7*SZL(r3) |
| 70 | PPC_STL r17,8*SZL(r3) |
| 71 | PPC_STL r18,9*SZL(r3) |
| 72 | PPC_STL r19,10*SZL(r3) |
| 73 | PPC_STL r20,11*SZL(r3) |
| 74 | PPC_STL r21,12*SZL(r3) |
| 75 | PPC_STL r22,13*SZL(r3) |
| 76 | PPC_STL r23,14*SZL(r3) |
| 77 | PPC_STL r24,15*SZL(r3) |
| 78 | PPC_STL r25,16*SZL(r3) |
| 79 | PPC_STL r26,17*SZL(r3) |
| 80 | PPC_STL r27,18*SZL(r3) |
| 81 | PPC_STL r28,19*SZL(r3) |
| 82 | PPC_STL r29,20*SZL(r3) |
| 83 | PPC_STL r30,21*SZL(r3) |
| 84 | PPC_STL r31,22*SZL(r3) |
| 85 | li r3,0 |
| 86 | blr |
| 87 | |
| 88 | _GLOBAL(longjmp) |
| 89 | PPC_LCMPI r4,0 |
| 90 | bne 1f |
| 91 | li r4,1 |
| 92 | 1: PPC_LL r13,4*SZL(r3) |
| 93 | PPC_LL r14,5*SZL(r3) |
| 94 | PPC_LL r15,6*SZL(r3) |
| 95 | PPC_LL r16,7*SZL(r3) |
| 96 | PPC_LL r17,8*SZL(r3) |
| 97 | PPC_LL r18,9*SZL(r3) |
| 98 | PPC_LL r19,10*SZL(r3) |
| 99 | PPC_LL r20,11*SZL(r3) |
| 100 | PPC_LL r21,12*SZL(r3) |
| 101 | PPC_LL r22,13*SZL(r3) |
| 102 | PPC_LL r23,14*SZL(r3) |
| 103 | PPC_LL r24,15*SZL(r3) |
| 104 | PPC_LL r25,16*SZL(r3) |
| 105 | PPC_LL r26,17*SZL(r3) |
| 106 | PPC_LL r27,18*SZL(r3) |
| 107 | PPC_LL r28,19*SZL(r3) |
| 108 | PPC_LL r29,20*SZL(r3) |
| 109 | PPC_LL r30,21*SZL(r3) |
| 110 | PPC_LL r31,22*SZL(r3) |
| 111 | PPC_LL r0,3*SZL(r3) |
| 112 | mtcrf 0x38,r0 |
| 113 | PPC_LL r0,0(r3) |
| 114 | PPC_LL r1,SZL(r3) |
| 115 | PPC_LL r2,2*SZL(r3) |
| 116 | mtlr r0 |
| 117 | mr r3,r4 |
| 118 | blr |
Michael Neuling | e952e6c | 2008-06-18 10:47:26 +1000 | [diff] [blame] | 119 | |
| 120 | _GLOBAL(__setup_cpu_power7) |
| 121 | _GLOBAL(__restore_cpu_power7) |
| 122 | /* place holder */ |
| 123 | blr |