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Linux/arch/unicore32/include/asm/ptrace.h

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  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 #define profile_pc(regs)                instruction_pointer(regs)
 59 
 60 #endif /* __ASSEMBLY__ */
 61 #endif
 62 

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