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 33 1: 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 _ASM_NOKPROBE_SYMBOL(reloc_offset) 40 _ASM_NOKPROBE_SYMBOL(add_reloc_offset) 41 42 .align 3 43 2: PPC_LONG 1b 44 45 _GLOBAL(setjmp) 46 mflr r0 47 PPC_STL r0,0(r3) 48 PPC_STL r1,SZL(r3) 49 PPC_STL r2,2*SZL(r3) 50 #ifdef CONFIG_PPC32 51 mfcr r12 52 stmw r12, 3*SZL(r3) 53 #else 54 mfcr r0 55 PPC_STL r0,3*SZL(r3) 56 PPC_STL r13,4*SZL(r3) 57 PPC_STL r14,5*SZL(r3) 58 PPC_STL r15,6*SZL(r3) 59 PPC_STL r16,7*SZL(r3) 60 PPC_STL r17,8*SZL(r3) 61 PPC_STL r18,9*SZL(r3) 62 PPC_STL r19,10*SZL(r3) 63 PPC_STL r20,11*SZL(r3) 64 PPC_STL r21,12*SZL(r3) 65 PPC_STL r22,13*SZL(r3) 66 PPC_STL r23,14*SZL(r3) 67 PPC_STL r24,15*SZL(r3) 68 PPC_STL r25,16*SZL(r3) 69 PPC_STL r26,17*SZL(r3) 70 PPC_STL r27,18*SZL(r3) 71 PPC_STL r28,19*SZL(r3) 72 PPC_STL r29,20*SZL(r3) 73 PPC_STL r30,21*SZL(r3) 74 PPC_STL r31,22*SZL(r3) 75 #endif 76 li r3,0 77 blr 78 79 _GLOBAL(longjmp) 80 #ifdef CONFIG_PPC32 81 lmw r12, 3*SZL(r3) 82 mtcrf 0x38, r12 83 #else 84 PPC_LL r13,4*SZL(r3) 85 PPC_LL r14,5*SZL(r3) 86 PPC_LL r15,6*SZL(r3) 87 PPC_LL r16,7*SZL(r3) 88 PPC_LL r17,8*SZL(r3) 89 PPC_LL r18,9*SZL(r3) 90 PPC_LL r19,10*SZL(r3) 91 PPC_LL r20,11*SZL(r3) 92 PPC_LL r21,12*SZL(r3) 93 PPC_LL r22,13*SZL(r3) 94 PPC_LL r23,14*SZL(r3) 95 PPC_LL r24,15*SZL(r3) 96 PPC_LL r25,16*SZL(r3) 97 PPC_LL r26,17*SZL(r3) 98 PPC_LL r27,18*SZL(r3) 99 PPC_LL r28,19*SZL(r3) 100 PPC_LL r29,20*SZL(r3) 101 PPC_LL r30,21*SZL(r3) 102 PPC_LL r31,22*SZL(r3) 103 PPC_LL r0,3*SZL(r3) 104 mtcrf 0x38,r0 105 #endif 106 PPC_LL r0,0(r3) 107 PPC_LL r1,SZL(r3) 108 PPC_LL r2,2*SZL(r3) 109 mtlr r0 110 mr. r3, r4 111 bnelr 112 li r3, 1 113 blr 114 115 _GLOBAL(current_stack_frame) 116 PPC_LL r3,0(r1) 117 blr 118 EXPORT_SYMBOL(current_stack_frame) 119