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  */
  34 static 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