82 lines
2.2 KiB
ArmAsm
82 lines
2.2 KiB
ArmAsm
/*
|
|
* Copyright (c) 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(swapcontext, libucontext_swapcontext)
|
|
ALIAS(__swapcontext, libucontext_swapcontext)
|
|
|
|
FUNC(libucontext_swapcontext)
|
|
/* move $a1 to $t0 to avoid clobbering. */
|
|
mv t0, a1
|
|
|
|
sw ra, REG_OFFSET(REG_PC)(a0)
|
|
sw ra, REG_OFFSET(REG_RA)(a0)
|
|
sw sp, REG_OFFSET(REG_SP)(a0)
|
|
|
|
/* first saved register block */
|
|
sw s0, REG_OFFSET(REG_S0)(a0)
|
|
sw s1, REG_OFFSET(REG_S1)(a0)
|
|
|
|
/* return register block */
|
|
sw x0, REG_OFFSET(REG_A0)(a0)
|
|
sw x0, REG_OFFSET(REG_A1)(a0)
|
|
|
|
/* second saved register block */
|
|
sw s2, REG_OFFSET(REG_S2)(a0)
|
|
sw s3, REG_OFFSET(REG_S3)(a0)
|
|
sw s4, REG_OFFSET(REG_S4)(a0)
|
|
sw s5, REG_OFFSET(REG_S5)(a0)
|
|
sw s6, REG_OFFSET(REG_S6)(a0)
|
|
sw s7, REG_OFFSET(REG_S7)(a0)
|
|
sw s8, REG_OFFSET(REG_S8)(a0)
|
|
sw s9, REG_OFFSET(REG_S9)(a0)
|
|
sw s10, REG_OFFSET(REG_S10)(a0)
|
|
sw s11, REG_OFFSET(REG_S11)(a0)
|
|
|
|
/* restore the other context from $t0. */
|
|
lw t1, REG_OFFSET(REG_PC)(t0)
|
|
lw ra, REG_OFFSET(REG_RA)(t0)
|
|
lw sp, REG_OFFSET(REG_SP)(t0)
|
|
|
|
/* first saved register block */
|
|
lw s0, REG_OFFSET(REG_S0)(t0)
|
|
lw s1, REG_OFFSET(REG_S1)(t0)
|
|
|
|
/* return register block */
|
|
lw a0, REG_OFFSET(REG_A0)(t0)
|
|
lw a1, REG_OFFSET(REG_A1)(t0)
|
|
|
|
/* argument register block */
|
|
lw a2, REG_OFFSET(REG_A2)(t0)
|
|
lw a3, REG_OFFSET(REG_A3)(t0)
|
|
lw a4, REG_OFFSET(REG_A4)(t0)
|
|
lw a5, REG_OFFSET(REG_A5)(t0)
|
|
lw a6, REG_OFFSET(REG_A6)(t0)
|
|
lw a7, REG_OFFSET(REG_A7)(t0)
|
|
|
|
/* second saved register block */
|
|
lw s2, REG_OFFSET(REG_S2)(t0)
|
|
lw s3, REG_OFFSET(REG_S3)(t0)
|
|
lw s4, REG_OFFSET(REG_S4)(t0)
|
|
lw s5, REG_OFFSET(REG_S5)(t0)
|
|
lw s6, REG_OFFSET(REG_S6)(t0)
|
|
lw s7, REG_OFFSET(REG_S7)(t0)
|
|
lw s8, REG_OFFSET(REG_S8)(t0)
|
|
lw s9, REG_OFFSET(REG_S9)(t0)
|
|
lw s10, REG_OFFSET(REG_S10)(t0)
|
|
lw s11, REG_OFFSET(REG_S11)(t0)
|
|
|
|
/* done swapping, jump to new PC in S1 */
|
|
jr t1
|
|
END(libucontext_swapcontext)
|