82 lines
2.2 KiB
ArmAsm
82 lines
2.2 KiB
ArmAsm
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/*
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* Copyright (c) 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(swapcontext, libucontext_swapcontext)
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ALIAS(__swapcontext, libucontext_swapcontext)
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FUNC(libucontext_swapcontext)
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/* move $a1 to $t0 to avoid clobbering. */
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mv t0, a1
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sw ra, REG_OFFSET(REG_PC)(a0)
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sw ra, REG_OFFSET(REG_RA)(a0)
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sw sp, REG_OFFSET(REG_SP)(a0)
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/* first saved register block */
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sw s0, REG_OFFSET(REG_S0)(a0)
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sw s1, REG_OFFSET(REG_S1)(a0)
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/* return register block */
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sw a0, REG_OFFSET(REG_A0)(a0)
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sw a1, REG_OFFSET(REG_A1)(a0)
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/* second saved register block */
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sw s2, REG_OFFSET(REG_S2)(a0)
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sw s3, REG_OFFSET(REG_S3)(a0)
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sw s4, REG_OFFSET(REG_S4)(a0)
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sw s5, REG_OFFSET(REG_S5)(a0)
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sw s6, REG_OFFSET(REG_S6)(a0)
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sw s7, REG_OFFSET(REG_S7)(a0)
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sw s8, REG_OFFSET(REG_S8)(a0)
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sw s9, REG_OFFSET(REG_S9)(a0)
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sw s10, REG_OFFSET(REG_S10)(a0)
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sw s11, REG_OFFSET(REG_S11)(a0)
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/* restore the other context from $t0. */
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lw t1, REG_OFFSET(REG_PC)(t0)
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lw ra, REG_OFFSET(REG_RA)(t0)
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lw sp, REG_OFFSET(REG_SP)(t0)
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/* first saved register block */
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lw s0, REG_OFFSET(REG_S0)(t0)
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lw s1, REG_OFFSET(REG_S1)(t0)
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/* return register block */
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lw a0, REG_OFFSET(REG_A0)(t0)
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lw a1, REG_OFFSET(REG_A1)(t0)
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/* argument register block */
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lw a2, REG_OFFSET(REG_A2)(t0)
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lw a3, REG_OFFSET(REG_A3)(t0)
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lw a4, REG_OFFSET(REG_A4)(t0)
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lw a5, REG_OFFSET(REG_A5)(t0)
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lw a6, REG_OFFSET(REG_A6)(t0)
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lw a7, REG_OFFSET(REG_A7)(t0)
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/* second saved register block */
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lw s2, REG_OFFSET(REG_S2)(t0)
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lw s3, REG_OFFSET(REG_S3)(t0)
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lw s4, REG_OFFSET(REG_S4)(t0)
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lw s5, REG_OFFSET(REG_S5)(t0)
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lw s6, REG_OFFSET(REG_S6)(t0)
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lw s7, REG_OFFSET(REG_S7)(t0)
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lw s8, REG_OFFSET(REG_S8)(t0)
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lw s9, REG_OFFSET(REG_S9)(t0)
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lw s10, REG_OFFSET(REG_S10)(t0)
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lw s11, REG_OFFSET(REG_S11)(t0)
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/* done swapping, jump to new PC in S1 */
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jr t1
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END(libucontext_swapcontext)
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