utcb.h

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/*
 * (c) 2008-2009 Adam Lackorzynski <adam@os.inf.tu-dresden.de>,
 *               Alexander Warg <warg@os.inf.tu-dresden.de>
 *     economic rights: Technische Universität Dresden (Germany)
 *
 * This file is part of TUD:OS and distributed under the terms of the
 * GNU General Public License 2.
 * Please see the COPYING-GPL-2 file for details.
 *
 * As a special exception, you may use this file as part of a free software
 * library without restriction.  Specifically, if other files instantiate
 * templates or use macros or inline functions from this file, or you compile
 * this file and link it with other files to produce an executable, this
 * file does not by itself cause the resulting executable to be covered by
 * the GNU General Public License.  This exception does not however
 * invalidate any other reasons why the executable file might be covered by
 * the GNU General Public License.
 */
#ifndef __L4_SYS__INCLUDE__ARCH_ARM__UTCB_H__
#define __L4_SYS__INCLUDE__ARCH_ARM__UTCB_H__
 
#include <l4/sys/types.h>
 
typedef struct l4_exc_regs_t
{
  l4_umword_t pfa;     
  l4_umword_t err;     
  l4_umword_t r[13];   
  l4_umword_t sp;      
  l4_umword_t ulr;     
  l4_umword_t _dummy1; 
  l4_umword_t pc;      
  l4_umword_t cpsr;    
  l4_umword_t tpidruro;
  l4_umword_t tpidrurw;
} l4_exc_regs_t;
 
enum L4_utcb_consts_arm
{
  L4_UTCB_EXCEPTION_REGS_SIZE    = sizeof(l4_exc_regs_t) / sizeof(l4_umword_t),
  L4_UTCB_GENERIC_DATA_SIZE      = 63,
  L4_UTCB_GENERIC_BUFFERS_SIZE   = 58,
 
  L4_UTCB_MSG_REGS_OFFSET        = 0,
  L4_UTCB_BUF_REGS_OFFSET        = 64 * sizeof(l4_umword_t),
  L4_UTCB_THREAD_REGS_OFFSET     = 123 * sizeof(l4_umword_t),
 
  L4_UTCB_INHERIT_FPU            = 1UL << 24,
 
  L4_UTCB_OFFSET                 = 512,
};
 
#include_next <l4/sys/utcb.h>
 
/*
 * ==================================================================
 * Implementations.
 */
 
#ifdef __GNUC__
L4_INLINE l4_utcb_t *l4_utcb_direct(void) L4_NOTHROW
{
# if defined(__ARM_ARCH) && __ARM_ARCH >= 7
  l4_utcb_t *utcb;
  __asm__ ("mrc p15, 0, %0, c13, c0, 2" : "=r" (utcb)); // TPIDRURW
#else
  register l4_utcb_t *utcb __asm__ ("r0");
  __asm__ ("mov lr, pc    \n"
           "mvn pc, #0xff \n"      // write 0xffffff00 to pc
           : "=r"(utcb) : : "lr");
#endif
  return utcb;
}
#endif
 
L4_INLINE l4_umword_t l4_utcb_exc_pc(l4_exc_regs_t const *u) L4_NOTHROW
{
  return u->pc;
}
 
L4_INLINE void l4_utcb_exc_pc_set(l4_exc_regs_t *u, l4_addr_t pc) L4_NOTHROW
{
  u->pc = pc;
}
 
L4_INLINE l4_umword_t l4_utcb_exc_typeval(l4_exc_regs_t const *u) L4_NOTHROW
{
  return u->err >> 26;
}
 
L4_INLINE int l4_utcb_exc_is_pf(l4_exc_regs_t const *u) L4_NOTHROW
{
  return ((u->err >> 26) & 0x30) == 0x20;
}
 
L4_INLINE l4_addr_t l4_utcb_exc_pfa(l4_exc_regs_t const *u) L4_NOTHROW
{
  return (u->pfa & ~7UL) | ((u->err >> 5) & 2);
}
 
L4_INLINE int l4_utcb_exc_is_ex_regs_exception(l4_exc_regs_t const *u) L4_NOTHROW
{
  return l4_utcb_exc_typeval(u) == 0x3e;
}
 
#endif /* ! __L4_SYS__INCLUDE__ARCH_ARM__UTCB_H__ */