arch/unicore32/include/asm/ptrace.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * linux/arch/unicore32/include/asm/ptrace.h
   4  *
   5  * Code specific to PKUnity SoC and UniCore ISA
   6  *
   7  * Copyright (C) 2001-2010 GUAN Xue-tao
   8  */
   9 #ifndef __UNICORE_PTRACE_H__
  10 #define __UNICORE_PTRACE_H__
  11
  12 #include <uapi/asm/ptrace.h>
  13
  14 #ifndef __ASSEMBLY__
  15
  16 #define user_mode(regs) \
  17         (processor_mode(regs) == USER_MODE)
  18
  19 #define processor_mode(regs) \
  20         ((regs)->UCreg_asr & MODE_MASK)
  21
  22 #define interrupts_enabled(regs) \
  23         (!((regs)->UCreg_asr & PSR_I_BIT))
  24
  25 #define fast_interrupts_enabled(regs) \
  26         (!((regs)->UCreg_asr & PSR_R_BIT))
  27
  28 /* Are the current registers suitable for user mode?
  29  * (used to maintain security in signal handlers)
  30  */
  31 static inline int valid_user_regs(struct pt_regs *regs)
  32 {
  33         unsigned long mode = regs->UCreg_asr & MODE_MASK;
  34
  35         /*
  36          * Always clear the R (REAL) bits
  37          */
  38         regs->UCreg_asr &= ~(PSR_R_BIT);
  39
  40         if ((regs->UCreg_asr & PSR_I_BIT) == 0) {
  41                 if (mode == USER_MODE)
  42                         return 1;
  43         }
  44
  45         /*
  46          * Force ASR to something logical...
  47          */
  48         regs->UCreg_asr &= PSR_f | USER_MODE;
  49
  50         return 0;
  51 }
  52
  53 #define instruction_pointer(regs)       ((regs)->UCreg_pc)
  54 #define user_stack_pointer(regs)        ((regs)->UCreg_sp)
  55 #define profile_pc(regs)                instruction_pointer(regs)
  56
  57 #endif /* __ASSEMBLY__ */
  58 #endif