88fe385600
usermode context switches (long jumps and ucontext operations). If these are used across threads, multiple threads can end up with the same TLS base. Madness will then result. This makes behavior on PPC match that on x86 systems and on Linux. MFC after: 10 days
99 lines
2.8 KiB
ArmAsm
99 lines
2.8 KiB
ArmAsm
/*-
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* Copyright (c) 2002 Peter Grehan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* $NetBSD: sigsetjmp.S,v 1.4 1998/10/03 12:30:38 tsubai Exp $ */
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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/*
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* C library -- sigsetjmp, siglongjmp
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*
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* siglongjmp(a,v)
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* will generate a "return(v?v:1)" from the last call to
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* sigsetjmp(a, savemask)
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* by restoring registers from the stack.
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* The previous signal state is restored if savemask is non-zero
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*
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* jmpbuf layout:
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* +------------+
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* | savemask |
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* +------------+
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* | sig state |
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* | |
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* | (4 words) |
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* | |
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* +------------+
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* | saved regs |
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* | ... |
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*/
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#include <sys/syscall.h>
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ENTRY(sigsetjmp)
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mr %r6,%r3
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stw %r4,0(%r3)
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or. %r7,%r4,%r4
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beq 1f
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li %r3,1 /* SIG_BLOCK, but doesn't matter */
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/* since set == NULL */
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li %r4,0 /* set = NULL */
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mr %r5,%r6 /* &oset */
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addi %r5,%r5,4
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li %r0, SYS_sigprocmask /* sigprocmask(SIG_BLOCK, NULL, &oset)*/
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sc /* assume no error XXX */
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1:
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mflr %r11
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mfcr %r12
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mr %r10,%r1
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mr %r9,%r2
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stmw %r9,20(%r6)
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li %r3,0
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blr
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ENTRY(siglongjmp)
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lmw %r9,20(%r3)
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lwz %r7,0(%r3)
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mr %r6,%r4
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mtlr %r11
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mtcr %r12
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mr %r1,%r10
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or. %r7,%r7,%r7
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beq 1f
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mr %r4,%r3
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li %r3,3 /* SIG_SETMASK */
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addi %r4,%r4,4 /* &set */
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li %r5,0 /* oset = NULL */
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li %r0,SYS_sigprocmask /* sigprocmask(SIG_SET, &set, NULL) */
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sc /* assume no error XXX */
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1:
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or. %r3,%r6,%r6
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bnelr
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li %r3,1
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blr
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.section .note.GNU-stack,"",%progbits
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