/* 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 <linux/export.h>
#include <asm/ppc_asm.h>
#include <asm/unistd.h>
#include <asm/asm-compat.h>
#include <asm/asm-offsets.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
        bcl     20,31,$+4
1:      mflr    r5
        PPC_LL  r4,(2f-1b)(r5)
        subf    r5,r4,r5
        add     r3,r3,r5
        mtlr    r0
        blr
_ASM_NOKPROBE_SYMBOL(reloc_offset)
_ASM_NOKPROBE_SYMBOL(add_reloc_offset)

        .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_frame)
        PPC_LL  r3,0(r1)
        blr
EXPORT_SYMBOL(current_stack_frame)