/* $NetBSD: swapcontext.S,v 1.15.2.1 2021/08/08 10:22:04 martin Exp $ */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Klaus Klein. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include "SYS.h" #include "assym.h" #if defined(LIBC_SCCS) && !defined(lint) RCSID("$NetBSD: swapcontext.S,v 1.15.2.1 2021/08/08 10:22:04 martin Exp $") #endif /* LIBC_SCCS && !lint */ ENTRY(swapcontext) #if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) .fnstart .cfi_startproc #endif push {r0-r2, lr} /* Must save oucp, ucp, lr. */ #if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) .save {r0-r2, lr} .cfi_def_cfa_offset 16 .cfi_offset 14, -4 .cfi_offset 2, -8 .cfi_offset 1, -12 .cfi_offset 0, -16 #endif bl PLT_SYM(_C_LABEL(_getcontext)) /* getcontext(oucp) */ cmp r0, #0 #if !defined(__thumb__) pop {r0-r2, lr} #if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) .cfi_def_cfa_offset 0 #endif RETc(ne) #else pop {r0-r3} beq 1f #if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) .cfi_def_cfa_offset 0 .cfi_register 14, 3 #endif RETr(r3) 1: #endif #if !defined(__thumb__) str sp, [r0, #_UC_REGS_SP] /* Adjust saved SP. */ str lr, [r0, #_UC_REGS_PC] /* Adjust saved PC. */ #else mov r2, sp str r2, [r0, #_UC_REGS_SP] /* Adjust saved SP. */ str r3, [r0, #_UC_REGS_PC] /* Adjust saved PC. */ mov lr, r3 #endif #ifdef SOFTFLOAT /* Ahem. */ #endif mov r0, r1 #if !defined(__thumb__) || defined(_ARM_ARCH_T2) b PLT_SYM(_C_LABEL(setcontext)) #else push {r3, lr} bl PLT_SYM(_C_LABEL(setcontext)) pop {r3, pc} #endif #if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) .cfi_endproc .fnend #endif END(swapcontext)