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73 lines
1.8 KiB
ArmAsm
73 lines
1.8 KiB
ArmAsm
/* Swap to new context.
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Copyright (C) 2008-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include "ucontext_i.h"
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.text
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ENTRY(__swapcontext)
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/* Copy rp to ret0 (r28). */
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copy %rp,%ret0
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/* Create a frame. */
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ldo 64(%sp),%sp
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.cfi_def_cfa_offset -64
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/* Save the current machine context to oucp. */
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bl __getcontext,%rp
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/* Copy oucp to register ret1 (r29). __getcontext saves and
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restores it on a normal return. It is restored from oR29
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on reactivation. */
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copy %r26,%ret1
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/* Pop frame. */
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ldo -64(%sp),%sp
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.cfi_def_cfa_offset 0
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/* Load return pointer from oR28. */
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ldw oR28(%ret1),%rp
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/* Return if error. */
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or,= %r0,%ret0,%r0
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bv,n %r0(%rp)
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/* Load sc_sar flag. */
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ldb oSAR(%ret1),%r20
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/* Return if oucp context has been reactivated. */
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or,= %r0,%r20,%r0
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bv,n %r0(%rp)
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/* Mark sc_sar flag. */
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ldi 1,%r20
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stb %r20,oSAR(%ret1)
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/* Activate the machine context in ucp. */
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bl __setcontext,%rp
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ldw oR25(%ret1),%r26
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/* Load return pointer. */
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ldw oR28(%ret1),%rp
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bv,n %r0(%rp)
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END(__swapcontext)
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weak_alias (__swapcontext, swapcontext)
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