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  1. /*
  2.  * Copyright (c) 2008 Josef Cejka
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup ia32   
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_ia32_CONTEXT_OFFSET_H_
  36. #define KERN_ia32_CONTEXT_OFFSET_H_
  37.  
  38. #define OFFSET_SP  0x0
  39. #define OFFSET_PC  0x4
  40. #define OFFSET_EBX 0x8
  41. #define OFFSET_ESI 0xC
  42. #define OFFSET_EDI 0x10
  43. #define OFFSET_EBP 0x14
  44.  
  45. #ifdef KERNEL
  46. # define OFFSET_IPL 0x18
  47. #else
  48. # define OFFSET_TLS 0x18
  49. #endif
  50.  
  51.  
  52. #ifdef __ASM__
  53.  
  54. # ctx: address of the structure with saved context
  55. # pc: return address
  56.  
  57. .macro CONTEXT_SAVE_ARCH_CORE ctx:req pc:req
  58.     movl %esp,OFFSET_SP(\ctx)   # %esp -> ctx->sp  
  59.     movl \pc,OFFSET_PC(\ctx)    # %eip -> ctx->pc
  60.     movl %ebx,OFFSET_EBX(\ctx)  # %ebx -> ctx->ebx 
  61.     movl %esi,OFFSET_ESI(\ctx)  # %esi -> ctx->esi 
  62.     movl %edi,OFFSET_EDI(\ctx)  # %edi -> ctx->edi 
  63.     movl %ebp,OFFSET_EBP(\ctx)  # %ebp -> ctx->ebp 
  64. .endm
  65.  
  66. # ctx: address of the structure with saved context
  67.  
  68. .macro CONTEXT_RESTORE_ARCH_CORE ctx:req pc:req
  69.     movl OFFSET_SP(\ctx),%esp   # ctx->sp -> %esp
  70.     movl OFFSET_PC(\ctx),\pc    # ctx->pc -> \pc
  71.     movl OFFSET_EBX(\ctx),%ebx  # ctx->ebx -> %ebx
  72.     movl OFFSET_ESI(\ctx),%esi  # ctx->esi -> %esi
  73.     movl OFFSET_EDI(\ctx),%edi  # ctx->edi -> %edi
  74.     movl OFFSET_EBP(\ctx),%ebp  # ctx->ebp -> %ebp
  75. .endm
  76.  
  77. #endif /* __ASM__ */
  78.  
  79. #endif
  80.  
  81. /** @}
  82.  */
  83.  
  84.