/* * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009 * The President and Fellows of Harvard College. * * 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. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY 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 UNIVERSITY 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. */ /* * setjmp and longjmp for MIPS. */ #include <kern/mips/regdefs.h> .text .set noreorder /* * int setjmp(jmp_buf jb); * * Save the current state so we can return again from the call later * if/when longjmp is called. (If the function that called setjmp * returns before longjmp is called, the results are undefined. We * only need to save registers, not the whole contents of the stack.) */ .globl setjmp .type setjmp,@function .ent setjmp setjmp: /* * jmp_buf is in a0. We need to save s0-s8, sp, and ra in it. * Don't store more registers without adjusting machine/setjmp.h. */ sw sp, 0(a0) /* save registers */ sw ra, 4(a0) sw s0, 8(a0) sw s1, 12(a0) sw s2, 16(a0) sw s3, 20(a0) sw s4, 24(a0) sw s5, 28(a0) sw s6, 32(a0) sw s7, 36(a0) sw s8, 40(a0) j ra /* done */ li v0, 0 /* return 0 (in delay slot) */ .end setjmp /* * void longjmp(jmp_buf jb, int code); */ .globl longjmp .type longjmp,@function .ent longjmp longjmp: /* * jmp_buf is in a0. Return code is in a1. * We need to restore s0-s8, sp, and ra from the jmp_buf. * The return code is forced to 1 if 0 is passed in. */ sltiu t0, a1, 1 /* set t0 to 1 if return code is 0... otherwise 0 */ addu a1, a1, t0 /* update the return code */ lw sp, 0(a0) /* restore registers */ lw ra, 4(a0) lw s0, 8(a0) lw s1, 12(a0) lw s2, 16(a0) lw s3, 20(a0) lw s4, 24(a0) lw s5, 28(a0) lw s6, 32(a0) lw s7, 36(a0) lw s8, 40(a0) j ra /* return, to where setjmp was called from */ move v0, a1 /* set return value */ .end longjmp