arch/x86/include/sys/frame.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _SYS_FRAME_H
  28 #define _SYS_FRAME_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include <sys/regset.h>
  33
  34 #ifdef  __cplusplus
  35 extern "C" {
  36 #endif
  37
  38 /*
  39  * In the Intel world, a stack frame looks like this:
  40  *
  41  * %fp0->|                               |
  42  *       |-------------------------------|
  43  *       |  Args to next subroutine      |
  44  *       |-------------------------------|-\
  45  * %sp0->|  One word struct-ret address  | |
  46  *       |-------------------------------|  > minimum stack frame
  47  * %fp1->|  Previous frame pointer (%fp0)| |
  48  *       |-------------------------------|-/
  49  *       |  Local variables              |
  50  * %sp1->|-------------------------------|
  51  *
  52  * For amd64, the minimum stack frame is 16 bytes and the frame pointer must
  53  * be 16-byte aligned.
  54  */
  55
  56 struct frame {
  57         greg_t  fr_savfp;               /* saved frame pointer */
  58         greg_t  fr_savpc;               /* saved program counter */
  59 };
  60
  61 #ifdef _SYSCALL32
  62
  63 /*
  64  * Kernel's view of a 32-bit stack frame.
  65  */
  66 struct frame32 {
  67         greg32_t fr_savfp;              /* saved frame pointer */
  68         greg32_t fr_savpc;              /* saved program counter */
  69 };
  70
  71 #endif
  72
  73 #ifdef  __cplusplus
  74 }
  75 #endif
  76
  77 #endif  /* _SYS_FRAME_H */