/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * This file contains miscellaneous low-level functions. * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) * and Paul Mackerras. * * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) * * setjmp/longjmp code by Paul Mackerras. */ #include <asm/ppc_asm.h> #include <asm/unistd.h> #include <asm/asm-compat.h> #include <asm/asm-offsets.h> #include <asm/export.h> .text /* * Returns (address we are running at) - (address we were linked at) * for use before the text and data are mapped to KERNELBASE. * add_reloc_offset(x) returns x + reloc_offset(). */ _GLOBAL(reloc_offset) li r3, 0 _GLOBAL(add_reloc_offset) mflr r0 bl 1f 1: mflr r5 PPC_LL r4,(2f-1b)(r5) subf r5,r4,r5 add r3,r3,r5 mtlr r0 blr .align 3 2: PPC_LONG 1b _GLOBAL(setjmp) mflr r0 PPC_STL r0,0(r3) PPC_STL r1,SZL(r3) PPC_STL r2,2*SZL(r3) #ifdef CONFIG_PPC32 mfcr r12 stmw r12, 3*SZL(r3) #else mfcr r0 PPC_STL r0,3*SZL(r3) PPC_STL r13,4*SZL(r3) PPC_STL r14,5*SZL(r3) PPC_STL r15,6*SZL(r3) PPC_STL r16,7*SZL(r3) PPC_STL r17,8*SZL(r3) PPC_STL r18,9*SZL(r3) PPC_STL r19,10*SZL(r3) PPC_STL r20,11*SZL(r3) PPC_STL r21,12*SZL(r3) PPC_STL r22,13*SZL(r3) PPC_STL r23,14*SZL(r3) PPC_STL r24,15*SZL(r3) PPC_STL r25,16*SZL(r3) PPC_STL r26,17*SZL(r3) PPC_STL r27,18*SZL(r3) PPC_STL r28,19*SZL(r3) PPC_STL r29,20*SZL(r3) PPC_STL r30,21*SZL(r3) PPC_STL r31,22*SZL(r3) #endif li r3,0 blr _GLOBAL(longjmp) #ifdef CONFIG_PPC32 lmw r12, 3*SZL(r3) mtcrf 0x38, r12 #else PPC_LL r13,4*SZL(r3) PPC_LL r14,5*SZL(r3) PPC_LL r15,6*SZL(r3) PPC_LL r16,7*SZL(r3) PPC_LL r17,8*SZL(r3) PPC_LL r18,9*SZL(r3) PPC_LL r19,10*SZL(r3) PPC_LL r20,11*SZL(r3) PPC_LL r21,12*SZL(r3) PPC_LL r22,13*SZL(r3) PPC_LL r23,14*SZL(r3) PPC_LL r24,15*SZL(r3) PPC_LL r25,16*SZL(r3) PPC_LL r26,17*SZL(r3) PPC_LL r27,18*SZL(r3) PPC_LL r28,19*SZL(r3) PPC_LL r29,20*SZL(r3) PPC_LL r30,21*SZL(r3) PPC_LL r31,22*SZL(r3) PPC_LL r0,3*SZL(r3) mtcrf 0x38,r0 #endif PPC_LL r0,0(r3) PPC_LL r1,SZL(r3) PPC_LL r2,2*SZL(r3) mtlr r0 mr. r3, r4 bnelr li r3, 1 blr _GLOBAL(current_stack_pointer) PPC_LL r3,0(r1) blr EXPORT_SYMBOL(current_stack_pointer)