46 lines
1.3 KiB
ArmAsm
46 lines
1.3 KiB
ArmAsm
/*
|
|
* Copyright (c) 2018, 2020 Ariadne Conill <ariadne@dereferenced.org>
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* This software is provided 'as is' and without any warranty, express or
|
|
* implied. In no event shall the authors be liable for any damages arising
|
|
* from the use of this software.
|
|
*/
|
|
|
|
#include "defs.h"
|
|
|
|
ALIAS(setcontext, libucontext_setcontext)
|
|
ALIAS(__setcontext, libucontext_setcontext)
|
|
|
|
FUNC(libucontext_setcontext)
|
|
/* restore GPRs */
|
|
ldp x18, x19, [x0, #REG_OFFSET(18)]
|
|
ldp x20, x21, [x0, #REG_OFFSET(20)]
|
|
ldp x22, x23, [x0, #REG_OFFSET(22)]
|
|
ldp x24, x25, [x0, #REG_OFFSET(24)]
|
|
ldp x26, x27, [x0, #REG_OFFSET(26)]
|
|
ldp x28, x29, [x0, #REG_OFFSET(28)]
|
|
ldr x30, [x0, #REG_OFFSET(30)]
|
|
|
|
/* save current stack pointer */
|
|
ldr x2, [x0, #SP_OFFSET]
|
|
mov sp, x2
|
|
|
|
/* TODO: SIMD / FPRs */
|
|
|
|
/* save current program counter in link register */
|
|
ldr x16, [x0, #PC_OFFSET]
|
|
|
|
/* restore args */
|
|
ldp x2, x3, [x0, #REG_OFFSET(2)]
|
|
ldp x4, x5, [x0, #REG_OFFSET(4)]
|
|
ldp x6, x7, [x0, #REG_OFFSET(6)]
|
|
ldp x0, x1, [x0, #REG_OFFSET(0)]
|
|
|
|
/* jump to new PC */
|
|
br x16
|
|
END(libucontext_setcontext)
|