1/* 2 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009 3 * The President and Fellows of Harvard College. 4 * Copyright (c) 2017 MIPS Technologies, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#include <asm/asm.h> 32#include <asm/regdef.h> 33 34/* 35 * setjmp and longjmp for MIPS. 36 */ 37 38 .text 39 .set noreorder 40 41 /* 42 * int setjmp(jmp_buf jb); 43 * 44 * Save the current state so we can return again from the call later 45 * if/when longjmp is called. (If the function that called setjmp 46 * returns before longjmp is called, the results are undefined. We 47 * only need to save registers, not the whole contents of the stack.) 48 */ 49LEAF(setjmp) 50 /* 51 * jmp_buf is in a0. We need to save s0-s8, sp, gp, and ra in it. 52 * Don't store more registers without adjusting machine/setjmp.h. 53 */ 54 55 REG_S sp, 0(a0) /* save registers */ 56 REG_S ra, 1*SZREG(a0) 57 REG_S gp, 2*SZREG(a0) 58 REG_S s0, 3*SZREG(a0) 59 REG_S s1, 4*SZREG(a0) 60 REG_S s2, 5*SZREG(a0) 61 REG_S s3, 6*SZREG(a0) 62 REG_S s4, 7*SZREG(a0) 63 REG_S s5, 8*SZREG(a0) 64 REG_S s6, 9*SZREG(a0) 65 REG_S s7, 10*SZREG(a0) 66 REG_S s8, 11*SZREG(a0) 67 68 jr ra /* done */ 69 move v0, zero /* return 0 (in delay slot) */ 70END(setjmp) 71 72 73 /* 74 * void longjmp(jmp_buf jb, int code); 75 */ 76LEAF(longjmp) 77 /* 78 * jmp_buf is in a0. Return code is in a1. 79 * We need to restore s0-s8, sp, gp, and ra from the jmp_buf. 80 * The return code is forced to 1 if 0 is passed in. 81 */ 82 83 sltiu t0, a1, 1 /* set t0 to 1 if return code is 0... otherwise 0 */ 84 addu a1, a1, t0 /* update the return code */ 85 86 REG_L sp, 0(a0) /* restore registers */ 87 REG_L ra, 1*SZREG(a0) 88 REG_L gp, 2*SZREG(a0) 89 REG_L s0, 3*SZREG(a0) 90 REG_L s1, 4*SZREG(a0) 91 REG_L s2, 5*SZREG(a0) 92 REG_L s3, 6*SZREG(a0) 93 REG_L s4, 7*SZREG(a0) 94 REG_L s5, 8*SZREG(a0) 95 REG_L s6, 9*SZREG(a0) 96 REG_L s7, 10*SZREG(a0) 97 REG_L s8, 11*SZREG(a0) 98 99 jr ra /* return, to where setjmp was called from */ 100 move v0, a1 /* set return value */ 101END(longjmp) 102 103#ifdef __ELF__ 104.section .note.GNU-stack,"",%progbits 105#endif 106