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33e1402435
bl;mflr is used at several places to get code position.
Use bcl 20,31,+4 instead of bl in order to preserve link stack.
See commit c974809a26 ("powerpc/vdso: Avoid link stack corruption
in __get_datapage()") for details.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c6eabb4fb6c156f75d56dcbcc6f243e5ac0fba42.1629791763.git.christophe.leroy@csgroup.eu
119 lines
2.3 KiB
ArmAsm
119 lines
2.3 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* This file contains miscellaneous low-level functions.
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras.
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*
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* PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
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*
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* setjmp/longjmp code by Paul Mackerras.
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*/
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#include <asm/ppc_asm.h>
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#include <asm/unistd.h>
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#include <asm/asm-compat.h>
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#include <asm/asm-offsets.h>
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#include <asm/export.h>
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.text
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/*
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* Returns (address we are running at) - (address we were linked at)
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* for use before the text and data are mapped to KERNELBASE.
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* add_reloc_offset(x) returns x + reloc_offset().
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*/
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_GLOBAL(reloc_offset)
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li r3, 0
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_GLOBAL(add_reloc_offset)
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mflr r0
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bcl 20,31,$+4
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1: mflr r5
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PPC_LL r4,(2f-1b)(r5)
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subf r5,r4,r5
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add r3,r3,r5
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mtlr r0
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blr
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_ASM_NOKPROBE_SYMBOL(reloc_offset)
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_ASM_NOKPROBE_SYMBOL(add_reloc_offset)
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.align 3
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2: PPC_LONG 1b
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_GLOBAL(setjmp)
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mflr r0
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PPC_STL r0,0(r3)
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PPC_STL r1,SZL(r3)
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PPC_STL r2,2*SZL(r3)
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#ifdef CONFIG_PPC32
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mfcr r12
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stmw r12, 3*SZL(r3)
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#else
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mfcr r0
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PPC_STL r0,3*SZL(r3)
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PPC_STL r13,4*SZL(r3)
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PPC_STL r14,5*SZL(r3)
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PPC_STL r15,6*SZL(r3)
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PPC_STL r16,7*SZL(r3)
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PPC_STL r17,8*SZL(r3)
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PPC_STL r18,9*SZL(r3)
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PPC_STL r19,10*SZL(r3)
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PPC_STL r20,11*SZL(r3)
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PPC_STL r21,12*SZL(r3)
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PPC_STL r22,13*SZL(r3)
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PPC_STL r23,14*SZL(r3)
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PPC_STL r24,15*SZL(r3)
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PPC_STL r25,16*SZL(r3)
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PPC_STL r26,17*SZL(r3)
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PPC_STL r27,18*SZL(r3)
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PPC_STL r28,19*SZL(r3)
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PPC_STL r29,20*SZL(r3)
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PPC_STL r30,21*SZL(r3)
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PPC_STL r31,22*SZL(r3)
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#endif
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li r3,0
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blr
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_GLOBAL(longjmp)
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#ifdef CONFIG_PPC32
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lmw r12, 3*SZL(r3)
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mtcrf 0x38, r12
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#else
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PPC_LL r13,4*SZL(r3)
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PPC_LL r14,5*SZL(r3)
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PPC_LL r15,6*SZL(r3)
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PPC_LL r16,7*SZL(r3)
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PPC_LL r17,8*SZL(r3)
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PPC_LL r18,9*SZL(r3)
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PPC_LL r19,10*SZL(r3)
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PPC_LL r20,11*SZL(r3)
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PPC_LL r21,12*SZL(r3)
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PPC_LL r22,13*SZL(r3)
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PPC_LL r23,14*SZL(r3)
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PPC_LL r24,15*SZL(r3)
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PPC_LL r25,16*SZL(r3)
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PPC_LL r26,17*SZL(r3)
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PPC_LL r27,18*SZL(r3)
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PPC_LL r28,19*SZL(r3)
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PPC_LL r29,20*SZL(r3)
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PPC_LL r30,21*SZL(r3)
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PPC_LL r31,22*SZL(r3)
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PPC_LL r0,3*SZL(r3)
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mtcrf 0x38,r0
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#endif
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PPC_LL r0,0(r3)
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PPC_LL r1,SZL(r3)
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PPC_LL r2,2*SZL(r3)
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mtlr r0
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mr. r3, r4
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bnelr
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li r3, 1
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blr
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_GLOBAL(current_stack_frame)
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PPC_LL r3,0(r1)
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blr
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EXPORT_SYMBOL(current_stack_frame)
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