mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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be6abfa769
the only non-obvious part is that current_pt_regs() is really needed here - task_pt_regs() is NULL for kernel threads; it's OK for ptrace uses (the thing task_pt_regs() is intended for), but not for us. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
116 lines
2.3 KiB
ArmAsm
116 lines
2.3 KiB
ArmAsm
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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.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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*/
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_GLOBAL(reloc_offset)
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mflr r0
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bl 1f
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1: mflr r3
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PPC_LL r4,(2f-1b)(r3)
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subf r3,r4,r3
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mtlr r0
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blr
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.align 3
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2: PPC_LONG 1b
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/*
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* add_reloc_offset(x) returns x + reloc_offset().
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*/
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_GLOBAL(add_reloc_offset)
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mflr r0
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bl 1f
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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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.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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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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li r3,0
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blr
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_GLOBAL(longjmp)
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PPC_LCMPI r4,0
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bne 1f
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li r4,1
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1: 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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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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blr
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