69 lines
2.6 KiB
ArmAsm
69 lines
2.6 KiB
ArmAsm
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Assembler-level thread startup trampoline.
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*/
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#include <kern/mips/regdefs.h>
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.text
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.set noreorder
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.globl mips_threadstart
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.type mips_threadstart,@function
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.ent mips_threadstart
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mips_threadstart:
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/*
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* This code doesn't take normal arguments. It's reached when
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* switchframe_switch switches to a new thread. switchframe_switch
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* does "j ra"; ra gets preloaded in switchframe_init to come here.
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*
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* Our arguments are in callee-save registers, as follows:
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*
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* s0 entrypoint
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* s1 data1
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* s2 data2
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*
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* We need to rearrange these so as to call the normal C function
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* thread_startup(void (*entrypoint)(), void *data1, unsigned long data2).
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*/
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addiu sp, sp, -16 /* make our stack frame */
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move ra, $0 /* clear return addr so we're top of the call stack */
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move a0, s0 /* load arguments and call */
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move a1, s1
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j thread_startup
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move a2, s2 /* (in delay slot) */
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.end mips_threadstart
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