48 lines
1.3 KiB
ArmAsm
48 lines
1.3 KiB
ArmAsm
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/*
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* Copyright (c) 2018 William Pitcock <nenolod@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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.globl __setcontext;
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__setcontext:
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/* restore GPRs */
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ldp x18, x19, [x0, #R0_OFFSET + (18 * REGSZ)]
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ldp x20, x21, [x0, #R0_OFFSET + (20 * REGSZ)]
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ldp x22, x23, [x0, #R0_OFFSET + (22 * REGSZ)]
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ldp x24, x25, [x0, #R0_OFFSET + (24 * REGSZ)]
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ldp x26, x27, [x0, #R0_OFFSET + (26 * REGSZ)]
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ldp x28, x29, [x0, #R0_OFFSET + (28 * REGSZ)]
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ldr x30, [x0, #R0_OFFSET + (30 * REGSZ)]
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/* save current stack pointer */
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ldr x2, [x0, #SP_OFFSET]
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mov sp, x2
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/* TODO: SIMD / FPRs */
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/* save current program counter in link register */
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ldr x16, [x0, #PC_OFFSET]
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/* restore args */
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ldp x2, x3, [x0, #R0_OFFSET + (2 * REGSZ)]
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ldp x4, x5, [x0, #R0_OFFSET + (4 * REGSZ)]
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ldp x6, x7, [x0, #R0_OFFSET + (6 * REGSZ)]
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ldp x0, x1, [x0, #R0_OFFSET + (0 * REGSZ)]
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/* jump to new PC */
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br x16
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.weak setcontext;
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setcontext = __setcontext;
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