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2774 cejka 1
/*
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 * Copyright (c) 2008 Josef Cejka
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 * All rights reserved.
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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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 *
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 * - 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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 * - 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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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup ia32   
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_ia32_CONTEXT_OFFSET_H_
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#define KERN_ia32_CONTEXT_OFFSET_H_
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#define OFFSET_SP  0x0
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#define OFFSET_PC  0x4
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#define OFFSET_EBX 0x8
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#define OFFSET_ESI 0xC
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#define OFFSET_EDI 0x10
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#define OFFSET_EBP 0x14
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#ifdef KERNEL 
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# define OFFSET_IPL 0x18
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#else
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# define OFFSET_TLS 0x18
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#endif
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#ifdef __ASM__ 
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# ctx: address of the structure with saved context 
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# pc: return address
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.macro CONTEXT_SAVE_ARCH_CORE ctx:req pc:req
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    movl %esp,OFFSET_SP(\ctx)   # %esp -> ctx->sp   
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    movl \pc,OFFSET_PC(\ctx)    # %eip -> ctx->pc
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    movl %ebx,OFFSET_EBX(\ctx)  # %ebx -> ctx->ebx  
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    movl %esi,OFFSET_ESI(\ctx)  # %esi -> ctx->esi  
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    movl %edi,OFFSET_EDI(\ctx)  # %edi -> ctx->edi  
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    movl %ebp,OFFSET_EBP(\ctx)  # %ebp -> ctx->ebp  
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.endm
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# ctx: address of the structure with saved context 
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.macro CONTEXT_RESTORE_ARCH_CORE ctx:req pc:req
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    movl OFFSET_SP(\ctx),%esp   # ctx->sp -> %esp
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    movl OFFSET_PC(\ctx),\pc    # ctx->pc -> \pc
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    movl OFFSET_EBX(\ctx),%ebx  # ctx->ebx -> %ebx
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    movl OFFSET_ESI(\ctx),%esi  # ctx->esi -> %esi
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    movl OFFSET_EDI(\ctx),%edi  # ctx->edi -> %edi
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    movl OFFSET_EBP(\ctx),%ebp  # ctx->ebp -> %ebp
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.endm
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#endif /* __ASM__ */ 
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#endif
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/** @}
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 */
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