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 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) 9 * 10 * setjmp/longjmp code by Paul Mackerras. 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 */ 17#include <asm/ppc_asm.h> 18#include <asm/unistd.h> 19#include <asm/asm-compat.h> 20#include <asm/asm-offsets.h> 21#include <asm/export.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 * add_reloc_offset(x) returns x + reloc_offset(). 30 */ 31 32_GLOBAL(reloc_offset) 33 li r3, 0 34_GLOBAL(add_reloc_offset) 35 mflr r0 36 bl 1f 371: mflr r5 38 PPC_LL r4,(2f-1b)(r5) 39 subf r5,r4,r5 40 add r3,r3,r5 41 mtlr r0 42 blr 43 44 .align 3 452: PPC_LONG 1b 46 47_GLOBAL(setjmp) 48 mflr r0 49 PPC_STL r0,0(r3) 50 PPC_STL r1,SZL(r3) 51 PPC_STL r2,2*SZL(r3) 52#ifdef CONFIG_PPC32 53 mfcr r12 54 stmw r12, 3*SZL(r3) 55#else 56 mfcr r0 57 PPC_STL r0,3*SZL(r3) 58 PPC_STL r13,4*SZL(r3) 59 PPC_STL r14,5*SZL(r3) 60 PPC_STL r15,6*SZL(r3) 61 PPC_STL r16,7*SZL(r3) 62 PPC_STL r17,8*SZL(r3) 63 PPC_STL r18,9*SZL(r3) 64 PPC_STL r19,10*SZL(r3) 65 PPC_STL r20,11*SZL(r3) 66 PPC_STL r21,12*SZL(r3) 67 PPC_STL r22,13*SZL(r3) 68 PPC_STL r23,14*SZL(r3) 69 PPC_STL r24,15*SZL(r3) 70 PPC_STL r25,16*SZL(r3) 71 PPC_STL r26,17*SZL(r3) 72 PPC_STL r27,18*SZL(r3) 73 PPC_STL r28,19*SZL(r3) 74 PPC_STL r29,20*SZL(r3) 75 PPC_STL r30,21*SZL(r3) 76 PPC_STL r31,22*SZL(r3) 77#endif 78 li r3,0 79 blr 80 81_GLOBAL(longjmp) 82#ifdef CONFIG_PPC32 83 lmw r12, 3*SZL(r3) 84 mtcrf 0x38, r12 85#else 86 PPC_LL r13,4*SZL(r3) 87 PPC_LL r14,5*SZL(r3) 88 PPC_LL r15,6*SZL(r3) 89 PPC_LL r16,7*SZL(r3) 90 PPC_LL r17,8*SZL(r3) 91 PPC_LL r18,9*SZL(r3) 92 PPC_LL r19,10*SZL(r3) 93 PPC_LL r20,11*SZL(r3) 94 PPC_LL r21,12*SZL(r3) 95 PPC_LL r22,13*SZL(r3) 96 PPC_LL r23,14*SZL(r3) 97 PPC_LL r24,15*SZL(r3) 98 PPC_LL r25,16*SZL(r3) 99 PPC_LL r26,17*SZL(r3) 100 PPC_LL r27,18*SZL(r3) 101 PPC_LL r28,19*SZL(r3) 102 PPC_LL r29,20*SZL(r3) 103 PPC_LL r30,21*SZL(r3) 104 PPC_LL r31,22*SZL(r3) 105 PPC_LL r0,3*SZL(r3) 106 mtcrf 0x38,r0 107#endif 108 PPC_LL r0,0(r3) 109 PPC_LL r1,SZL(r3) 110 PPC_LL r2,2*SZL(r3) 111 mtlr r0 112 mr. r3, r4 113 bnelr 114 li r3, 1 115 blr 116 117_GLOBAL(current_stack_pointer) 118 PPC_LL r3,0(r1) 119 blr 120EXPORT_SYMBOL(current_stack_pointer) 121