/* * 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. */ /* * Assembler-level thread startup trampoline. */ #include <kern/mips/regdefs.h> .text .set noreorder .globl mips_threadstart .type mips_threadstart,@function .ent mips_threadstart mips_threadstart: /* * This code doesn't take normal arguments. It's reached when * switchframe_switch switches to a new thread. switchframe_switch * does "j ra"; ra gets preloaded in switchframe_init to come here. * * Our arguments are in callee-save registers, as follows: * * s0 entrypoint * s1 data1 * s2 data2 * * We need to rearrange these so as to call the normal C function * thread_startup(void (*entrypoint)(), void *data1, unsigned long data2). */ addiu sp, sp, -16 /* make our stack frame */ move ra, $0 /* clear return addr so we're top of the call stack */ move a0, s0 /* load arguments and call */ move a1, s1 j thread_startup move a2, s2 /* (in delay slot) */ .end mips_threadstart