2002-07-13 01:55:04 +08:00
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/*
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* cfe_prestart.S -- startup file for MIPS running CFE.
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* Derived from crt0.S.
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*
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* Copyright (c) 1995, 1996, 1997 Cygnus Support
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#ifdef __mips16
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/* This file contains 32 bit assembly code. */
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.set nomips16
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#endif
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#include "regs.S"
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/* This is for referencing addresses that are not in the .sdata or
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.sbss section under embedded-pic, or before we've set up gp. */
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#ifdef __mips_embedded_pic
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# ifdef __mips64
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# define LA(t,x) la t,x-PICBASE ; daddu t,s0,t
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# else
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# define LA(t,x) la t,x-PICBASE ; addu t,s0,t
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# endif
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#else /* __mips_embedded_pic */
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# define LA(t,x) la t,x
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#endif /* __mips_embedded_pic */
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.globl __cfe_handle
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.globl __cfe_entrypt
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.text
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.align 2
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.globl _prestart
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.ent _prestart
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_prestart:
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.set noreorder
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#ifdef __mips_embedded_pic
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PICBASE = .+8
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bal PICBASE
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nop
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move s0,$31
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#endif
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/* These are actually pointers, but they're guaranteed to be
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in compatibility space and it's just easier to store them
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as words ("unsigned int") than worry about the actual
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pointer size of the runtime we're building. */
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LA (v0, __cfe_handle)
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sw a0, 0(v0)
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LA (v0, __cfe_entrypt)
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sw a2, 0(v0)
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LA (v0, _start)
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jr v0
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nop
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.end _prestart
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2003-02-06 01:01:33 +08:00
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/* Avoid worst-case execution hazards. This is targetted at the SB-1
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pipe, and is much worse than it needs to be (not even counting
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the subroutine call and return). */
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.globl hardware_hazard_hook
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.ent hardware_hazard_hook
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hardware_hazard_hook:
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.set push
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.set mips32
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.set noreorder
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ssnop
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ssnop
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ssnop
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bnel $0, $0, .+4
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ssnop
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j ra
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nop
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.set pop
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.end hardware_hazard_hook
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