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 * setjmp/longjmp code by Paul Mackerras. 12 * 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> 19#include <asm/unistd.h> 20#include <asm/asm-compat.h> 21#include <asm/asm-offsets.h> 22 23 .text 24 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 331: mflr r3 34 PPC_LL r4,(2f-1b)(r3) 35 subf r3,r4,r3 36 mtlr r0 37 blr 38 39 .align 3 402: PPC_LONG 1b 41 42/* 43 * add_reloc_offset(x) returns x + reloc_offset(). 44 */ 45_GLOBAL(add_reloc_offset) 46 mflr r0 47 bl 1f 481: mflr r5 49 PPC_LL r4,(2f-1b)(r5) 50 subf r5,r4,r5 51 add r3,r3,r5 52 mtlr r0 53 blr 54 55 .align 3 562: PPC_LONG 1b 57 58_GLOBAL(kernel_execve) 59 li r0,__NR_execve 60 sc 61 bnslr 62 neg r3,r3 63 blr 64 65_GLOBAL(setjmp) 66 mflr r0 67 PPC_STL r0,0(r3) 68 PPC_STL r1,SZL(r3) 69 PPC_STL r2,2*SZL(r3) 70 mfcr r0 71 PPC_STL r0,3*SZL(r3) 72 PPC_STL r13,4*SZL(r3) 73 PPC_STL r14,5*SZL(r3) 74 PPC_STL r15,6*SZL(r3) 75 PPC_STL r16,7*SZL(r3) 76 PPC_STL r17,8*SZL(r3) 77 PPC_STL r18,9*SZL(r3) 78 PPC_STL r19,10*SZL(r3) 79 PPC_STL r20,11*SZL(r3) 80 PPC_STL r21,12*SZL(r3) 81 PPC_STL r22,13*SZL(r3) 82 PPC_STL r23,14*SZL(r3) 83 PPC_STL r24,15*SZL(r3) 84 PPC_STL r25,16*SZL(r3) 85 PPC_STL r26,17*SZL(r3) 86 PPC_STL r27,18*SZL(r3) 87 PPC_STL r28,19*SZL(r3) 88 PPC_STL r29,20*SZL(r3) 89 PPC_STL r30,21*SZL(r3) 90 PPC_STL r31,22*SZL(r3) 91 li r3,0 92 blr 93 94_GLOBAL(longjmp) 95 PPC_LCMPI r4,0 96 bne 1f 97 li r4,1 981: PPC_LL r13,4*SZL(r3) 99 PPC_LL r14,5*SZL(r3) 100 PPC_LL r15,6*SZL(r3) 101 PPC_LL r16,7*SZL(r3) 102 PPC_LL r17,8*SZL(r3) 103 PPC_LL r18,9*SZL(r3) 104 PPC_LL r19,10*SZL(r3) 105 PPC_LL r20,11*SZL(r3) 106 PPC_LL r21,12*SZL(r3) 107 PPC_LL r22,13*SZL(r3) 108 PPC_LL r23,14*SZL(r3) 109 PPC_LL r24,15*SZL(r3) 110 PPC_LL r25,16*SZL(r3) 111 PPC_LL r26,17*SZL(r3) 112 PPC_LL r27,18*SZL(r3) 113 PPC_LL r28,19*SZL(r3) 114 PPC_LL r29,20*SZL(r3) 115 PPC_LL r30,21*SZL(r3) 116 PPC_LL r31,22*SZL(r3) 117 PPC_LL r0,3*SZL(r3) 118 mtcrf 0x38,r0 119 PPC_LL r0,0(r3) 120 PPC_LL r1,SZL(r3) 121 PPC_LL r2,2*SZL(r3) 122 mtlr r0 123 mr r3,r4 124 blr 125 126_GLOBAL(__setup_cpu_power7) 127_GLOBAL(__restore_cpu_power7) 128 /* place holder */ 129 blr 130