LXR linux/arch/unicore32/include/asm/ptrace.h

   1/*
   2 * linux/arch/unicore32/include/asm/ptrace.h
   3 *
   4 * Code specific to PKUnity SoC and UniCore ISA
   5 *
   6 * Copyright (C) 2001-2010 GUAN Xue-tao
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12#ifndef __UNICORE_PTRACE_H__
  13#define __UNICORE_PTRACE_H__
  14
  15#include <uapi/asm/ptrace.h>
  16
  17#ifndef __ASSEMBLY__
  18
  19#define user_mode(regs) \
  20        (processor_mode(regs) == USER_MODE)
  21
  22#define processor_mode(regs) \
  23        ((regs)->UCreg_asr & MODE_MASK)
  24
  25#define interrupts_enabled(regs) \
  26        (!((regs)->UCreg_asr & PSR_I_BIT))
  27
  28#define fast_interrupts_enabled(regs) \
  29        (!((regs)->UCreg_asr & PSR_R_BIT))
  30
  31/* Are the current registers suitable for user mode?
  32 * (used to maintain security in signal handlers)
  33 */
  34static inline int valid_user_regs(struct pt_regs *regs)
  35{
  36        unsigned long mode = regs->UCreg_asr & MODE_MASK;
  37
  38        /*
  39         * Always clear the R (REAL) bits
  40         */
  41        regs->UCreg_asr &= ~(PSR_R_BIT);
  42
  43        if ((regs->UCreg_asr & PSR_I_BIT) == 0) {
  44                if (mode == USER_MODE)
  45                        return 1;
  46        }
  47
  48        /*
  49         * Force ASR to something logical...
  50         */
  51        regs->UCreg_asr &= PSR_f | USER_MODE;
  52
  53        return 0;
  54}
  55
  56#define instruction_pointer(regs)       ((regs)->UCreg_pc)
  57#define user_stack_pointer(regs)        ((regs)->UCreg_sp)
  58
  59#endif /* __ASSEMBLY__ */
  60#endif
  61