libucontext/arch/m68k/setcontext.S

32 lines
1.0 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(setcontext, libucontext_setcontext)
ALIAS(__setcontext, libucontext_setcontext)
FUNC(libucontext_setcontext)
move.l 4(%sp), %a0 /* load ucontext_t pointer from stack */
move.l REG_OFFSET(REG_SP)(%a0), %sp /* load new stack pointer */
movem.l REG_OFFSET(REG_D2)(%a0), %d2-%d7 /* load $d2 through $d7 */
movem.l REG_OFFSET(REG_A2)(%a0), %a2-%a6 /* load $a2 through $a6 */
clr.l %d0 /* clear $d0 */
move.l REG_OFFSET(REG_PC)(%a0), %a1 /* load jump target */
jmp (%a1) /* jump to *$a1 */
END(libucontext_setcontext)