utcb.h

Go to the documentation of this file.

/*
 * (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)
 *
 * License: see LICENSE.spdx (in this directory or the directories above)
 */
#ifndef __L4_SYS__INCLUDE__ARCH_ARM__UTCB_H__
#define __L4_SYS__INCLUDE__ARCH_ARM__UTCB_H__
 
#include <l4/sys/types.h>


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;
};
 
#define L4_UTCB_EXCEPTION_REGS_SIZE    (sizeof(l4_exc_regs_t) / sizeof(l4_umword_t))
#define L4_UTCB_GENERIC_DATA_SIZE      63
#define L4_UTCB_GENERIC_BUFFERS_SIZE   58
 
#define L4_UTCB_MSG_REGS_OFFSET        0
#define L4_UTCB_BUF_REGS_OFFSET        (64 * sizeof(l4_umword_t))
#define L4_UTCB_THREAD_REGS_OFFSET     (123 * sizeof(l4_umword_t))
 
#define L4_UTCB_INHERIT_FPU            (1UL << 24)
 
#define L4_UTCB_OFFSET                 512
 
/*
 * ==================================================================
 * 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__ */