7aa65edc75
Don't force 16-byte alignment at run-time. Do it at compile-time. This saves us the pointer fiddling by the setjmp functions and reduces complexity. While here, increase the jmp_buf by 16 bytes to an even 512 bytes. Coincidentally, due to the way alignment was handled prior to this change, the jmp_buf has not changed in size, but only in how the space is used. Prior to this change the 16 bytes were reserved for enforcing alignment; now they are reserved by us for future extensions. Therefore, this ABI breaker is relatively save: the failure is always an alignment trap.
82 lines
2.2 KiB
ArmAsm
82 lines
2.2 KiB
ArmAsm
/* $NetBSD: setjmp.S,v 1.3 1997/12/05 02:06:27 thorpej Exp $ */
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/* $FreeBSD$ */
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/*
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* Copyright (c) 1994, 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#define LOCORE
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#include <machine/asm.h>
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#include <machine/setjmp.h>
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/*
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* C library -- setjmp, longjmp
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*
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* longjmp(a,v)
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* will generate a "return(v)" from
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* the last call to
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* setjmp(a)
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* by restoring registers from the stack,
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* and the previous signal state.
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*/
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ENTRY(setjmp, 1)
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alloc loc0=ar.pfs,1,2,3,0
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mov loc1=rp
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;;
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mov out0=1 // how = SIG_BLOCK
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mov out1=0 // set = NULL
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add out2=J_SIG0,in0 // oset = &jb[J_SIG0]
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br.call.sptk.few rp=__sys_sigprocmask
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;;
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mov rp=loc1
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mov r14=loc0
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;;
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alloc r15=ar.pfs,1,0,0,0 // drop register frame
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;;
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mov ar.pfs=r14 // restore ar.pfs
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br.sptk.many _setjmp // finish saving state
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END(setjmp)
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WEAK_ALIAS(longjmp,__longjmp)
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ENTRY(__longjmp, 2)
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alloc loc0=ar.pfs,2,2,3,0
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mov loc1=rp
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;;
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mov out0=3 // how = SIG_SETMASK
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add out1=J_SIG0,in0 // set = &jb[J_SIG0]
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mov out2=0 // oset = NULL
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br.call.sptk.few rp=__sys_sigprocmask
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;;
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mov rp=loc1
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mov r14=loc0
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;;
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alloc r15=ar.pfs,2,0,0,0 // drop register frame
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;;
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mov ar.pfs=r14 // restore ar.pfs
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br.sptk.many _longjmp // finish restoring state
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END(__longjmp)
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