uspace/lib/c/arch/arm32/include/libarch/fibril_context.h

   1 /*
   2  * Copyright (c) 2014 Jakub Jermar
   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 #ifndef _LIBC_ARCH_FIBRIL_CONTEXT_H_
  30 #define _LIBC_ARCH_FIBRIL_CONTEXT_H_
  31
  32 #include <stdint.h>
  33
  34 /*
  35  * Only registers preserved across function calls are included. r9 is
  36  * used to store a TLS address. -ffixed-r9 gcc forces gcc not to use this
  37  * register. -mtp=soft forces gcc to use #__aeabi_read_tp to obtain
  38  * TLS address.
  39  */
  40
  41 // XXX: This struct must match the assembly code in src/fibril.S
  42
  43 typedef struct __context {
  44         uintptr_t sp;
  45         uintptr_t pc;
  46         uint32_t r4;
  47         uint32_t r5;
  48         uint32_t r6;
  49         uint32_t r7;
  50         uint32_t r8;
  51         /* r9 */
  52         uint32_t tls;
  53         uint32_t r10;
  54         /* r11 */
  55         uint32_t fp;
  56 } __context_t;
  57
  58 #endif