44 lines
1.2 KiB
ArmAsm
44 lines
1.2 KiB
ArmAsm
/*
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* Copyright (c) 2018, 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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#include "defs.h"
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ALIAS(setcontext, libucontext_setcontext)
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ALIAS(__setcontext, libucontext_setcontext)
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FUNC(libucontext_setcontext)
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#ifndef FORCE_SOFT_FLOAT
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#ifndef FORCE_HARD_FLOAT
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/* test for vfp magic number set by getcontext */
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ldr r2, [r0, #VFP_MAGIC_OFFSET]
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ldr r3, =#0x56465001
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cmp r2, r3
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bne 1f
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#endif
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/* if vfp in use, restore d8-d15 from uc_regspace */
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.fpu vfp
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add r14, r0, #VFP_D8_OFFSET
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vldmia r14, {d8-d15}
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.fpu softvfp
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1:
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#endif
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/* copy all of the current registers into the ucontext structure */
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add r14, r0, #REG_OFFSET(0)
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ldmia r14, {r0-r12}
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ldr r13, [r14, #52]
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add r14, r14, #56
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/* load link register and jump to new context */
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ldmia r14, {r14, pc}
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END(libucontext_setcontext)
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