swapcontext.S revision 1.11
11.11Smatt/* $NetBSD: swapcontext.S,v 1.11 2013/09/04 21:17:15 matt Exp $ */ 21.2Sthorpej 31.2Sthorpej/*- 41.2Sthorpej * Copyright (c) 2001 The NetBSD Foundation, Inc. 51.2Sthorpej * All rights reserved. 61.2Sthorpej * 71.2Sthorpej * This code is derived from software contributed to The NetBSD Foundation 81.2Sthorpej * by Klaus Klein. 91.2Sthorpej * 101.2Sthorpej * Redistribution and use in source and binary forms, with or without 111.2Sthorpej * modification, are permitted provided that the following conditions 121.2Sthorpej * are met: 131.2Sthorpej * 1. Redistributions of source code must retain the above copyright 141.2Sthorpej * notice, this list of conditions and the following disclaimer. 151.2Sthorpej * 2. Redistributions in binary form must reproduce the above copyright 161.2Sthorpej * notice, this list of conditions and the following disclaimer in the 171.2Sthorpej * documentation and/or other materials provided with the distribution. 181.2Sthorpej * 191.2Sthorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 201.2Sthorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 211.2Sthorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 221.2Sthorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 231.2Sthorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 241.2Sthorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 251.2Sthorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 261.2Sthorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 271.2Sthorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 281.2Sthorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 291.2Sthorpej * POSSIBILITY OF SUCH DAMAGE. 301.2Sthorpej */ 311.2Sthorpej 321.2Sthorpej#include "SYS.h" 331.8Sskrll#include "assym.h" 341.2Sthorpej 351.2Sthorpej#if defined(LIBC_SCCS) && !defined(lint) 361.11Smatt RCSID("$NetBSD: swapcontext.S,v 1.11 2013/09/04 21:17:15 matt Exp $") 371.2Sthorpej#endif /* LIBC_SCCS && !lint */ 381.2Sthorpej 391.2SthorpejENTRY(swapcontext) 401.11Smatt#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) 411.10Smatt .fnstart 421.10Smatt .cfi_startproc 431.11Smatt#endif 441.10Smatt push {r0-r2, lr} /* Must save oucp, ucp, lr. */ 451.11Smatt#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) 461.10Smatt .save {r0-r2, lr} 471.10Smatt .cfi_def_cfa_offset 16 481.10Smatt .cfi_offset 14, -4 491.10Smatt .cfi_offset 2, -8 501.10Smatt .cfi_offset 1, -12 511.10Smatt .cfi_offset 0, -16 521.11Smatt#endif 531.2Sthorpej bl PIC_SYM(_C_LABEL(_getcontext), PLT) /* getcontext(oucp) */ 541.2Sthorpej cmp r0, #0 551.10Smatt#if !defined(__thumb__) 561.10Smatt pop {r0-r2, lr} 571.10Smatt .cfi_def_cfa_offset 0 581.4Srearnsha RETc(ne) 591.10Smatt#else 601.10Smatt pop {r0-r3} 611.10Smatt beq 1f 621.11Smatt#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) 631.10Smatt .cfi_def_cfa_offset 0 641.10Smatt .cfi_register 14, 3 651.11Smatt#endif 661.10Smatt RETr(r3) 671.10Smatt1: 681.10Smatt#endif 691.10Smatt#if !defined(__thumb__) 701.8Sskrll str sp, [r0, #_UC_REGS_SP] /* Adjust saved SP. */ 711.10Smatt str lr, [r0, #_UC_REGS_PC] /* Adjust saved SP. */ 721.10Smatt#else 731.10Smatt mov r2, sp 741.10Smatt str r2, [r0, #_UC_REGS_SP] /* Adjust saved SP. */ 751.10Smatt str r3, [r0, #_UC_REGS_PC] /* Adjust saved PC. */ 761.10Smatt mov lr, r3 771.10Smatt#endif 781.2Sthorpej#ifdef SOFTFLOAT 791.2Sthorpej /* Ahem. */ 801.2Sthorpej#endif 811.2Sthorpej mov r0, r1 821.10Smatt#if !defined(__thumb__) || defined(_ARM_ARCH_T2) 831.10Smatt b PIC_SYM(_C_LABEL(setcontext), PLT) 841.10Smatt#else 851.10Smatt push {lr} 861.2Sthorpej bl PIC_SYM(_C_LABEL(setcontext), PLT) 871.10Smatt pop {pc} 881.10Smatt#endif 891.11Smatt#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__) 901.10Smatt .cfi_endproc 911.10Smatt .fnend 921.11Smatt#endif 931.10SmattEND(swapcontext) 94