1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * This file contains miscellaneous low-level functions. 4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 5 * 6 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) 7 * and Paul Mackerras. 8 * 9 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) 10 * 11 * setjmp/longjmp code by Paul Mackerras. 12 */ 13#include <asm/ppc_asm.h> 14#include <asm/unistd.h> 15#include <asm/asm-compat.h> 16#include <asm/asm-offsets.h> 17#include <asm/export.h> 18 19 .text 20 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 * add_reloc_offset(x) returns x + reloc_offset(). 26 */ 27 28_GLOBAL(reloc_offset) 29 li r3, 0 30_GLOBAL(add_reloc_offset) 31 mflr r0 32 bl 1f 331: mflr r5 34 PPC_LL r4,(2f-1b)(r5) 35 subf r5,r4,r5 36 add r3,r3,r5 37 mtlr r0 38 blr 39 40 .align 3 412: PPC_LONG 1b 42 43_GLOBAL(setjmp) 44 mflr r0 45 PPC_STL r0,0(r3) 46 PPC_STL r1,SZL(r3) 47 PPC_STL r2,2*SZL(r3) 48#ifdef CONFIG_PPC32 49 mfcr r12 50 stmw r12, 3*SZL(r3) 51#else 52 mfcr r0 53 PPC_STL r0,3*SZL(r3) 54 PPC_STL r13,4*SZL(r3) 55 PPC_STL r14,5*SZL(r3) 56 PPC_STL r15,6*SZL(r3) 57 PPC_STL r16,7*SZL(r3) 58 PPC_STL r17,8*SZL(r3) 59 PPC_STL r18,9*SZL(r3) 60 PPC_STL r19,10*SZL(r3) 61 PPC_STL r20,11*SZL(r3) 62 PPC_STL r21,12*SZL(r3) 63 PPC_STL r22,13*SZL(r3) 64 PPC_STL r23,14*SZL(r3) 65 PPC_STL r24,15*SZL(r3) 66 PPC_STL r25,16*SZL(r3) 67 PPC_STL r26,17*SZL(r3) 68 PPC_STL r27,18*SZL(r3) 69 PPC_STL r28,19*SZL(r3) 70 PPC_STL r29,20*SZL(r3) 71 PPC_STL r30,21*SZL(r3) 72 PPC_STL r31,22*SZL(r3) 73#endif 74 li r3,0 75 blr 76 77_GLOBAL(longjmp) 78#ifdef CONFIG_PPC32 79 lmw r12, 3*SZL(r3) 80 mtcrf 0x38, r12 81#else 82 PPC_LL r13,4*SZL(r3) 83 PPC_LL r14,5*SZL(r3) 84 PPC_LL r15,6*SZL(r3) 85 PPC_LL r16,7*SZL(r3) 86 PPC_LL r17,8*SZL(r3) 87 PPC_LL r18,9*SZL(r3) 88 PPC_LL r19,10*SZL(r3) 89 PPC_LL r20,11*SZL(r3) 90 PPC_LL r21,12*SZL(r3) 91 PPC_LL r22,13*SZL(r3) 92 PPC_LL r23,14*SZL(r3) 93 PPC_LL r24,15*SZL(r3) 94 PPC_LL r25,16*SZL(r3) 95 PPC_LL r26,17*SZL(r3) 96 PPC_LL r27,18*SZL(r3) 97 PPC_LL r28,19*SZL(r3) 98 PPC_LL r29,20*SZL(r3) 99 PPC_LL r30,21*SZL(r3) 100 PPC_LL r31,22*SZL(r3) 101 PPC_LL r0,3*SZL(r3) 102 mtcrf 0x38,r0 103#endif 104 PPC_LL r0,0(r3) 105 PPC_LL r1,SZL(r3) 106 PPC_LL r2,2*SZL(r3) 107 mtlr r0 108 mr. r3, r4 109 bnelr 110 li r3, 1 111 blr 112 113_GLOBAL(current_stack_pointer) 114 PPC_LL r3,0(r1) 115 blr 116EXPORT_SYMBOL(current_stack_pointer) 117