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#define PTRACE_GET_THREAD_AREA  22
  16
  17/*
  18 * PSR bits
  19 */
  20#define USER_MODE       0x00000010
  21#define REAL_MODE       0x00000011
  22#define INTR_MODE       0x00000012
  23#define PRIV_MODE       0x00000013
  24#define ABRT_MODE       0x00000017
  25#define EXTN_MODE       0x0000001b
  26#define SUSR_MODE       0x0000001f
  27#define MODE_MASK       0x0000001f
  28#define PSR_R_BIT       0x00000040
  29#define PSR_I_BIT       0x00000080
  30#define PSR_V_BIT       0x10000000
  31#define PSR_C_BIT       0x20000000
  32#define PSR_Z_BIT       0x40000000
  33#define PSR_S_BIT       0x80000000
  34
  35/*
  36 * Groups of PSR bits
  37 */
  38#define PSR_f           0xff000000      /* Flags                */
  39#define PSR_c           0x000000ff      /* Control              */
  40
  41#ifndef __ASSEMBLY__
  42
  43/*
  44 * This struct defines the way the registers are stored on the
  45 * stack during a system call.  Note that sizeof(struct pt_regs)
  46 * has to be a multiple of 8.
  47 */
  48struct pt_regs {
  49        unsigned long uregs[34];
  50};
  51
  52#define UCreg_asr               uregs[32]
  53#define UCreg_pc                uregs[31]
  54#define UCreg_lr                uregs[30]
  55#define UCreg_sp                uregs[29]
  56#define UCreg_ip                uregs[28]
  57#define UCreg_fp                uregs[27]
  58#define UCreg_26                uregs[26]
  59#define UCreg_25                uregs[25]
  60#define UCreg_24                uregs[24]
  61#define UCreg_23                uregs[23]
  62#define UCreg_22                uregs[22]
  63#define UCreg_21                uregs[21]
  64#define UCreg_20                uregs[20]
  65#define UCreg_19                uregs[19]
  66#define UCreg_18                uregs[18]
  67#define UCreg_17                uregs[17]
  68#define UCreg_16                uregs[16]
  69#define UCreg_15                uregs[15]
  70#define UCreg_14                uregs[14]
  71#define UCreg_13                uregs[13]
  72#define UCreg_12                uregs[12]
  73#define UCreg_11                uregs[11]
  74#define UCreg_10                uregs[10]
  75#define UCreg_09                uregs[9]
  76#define UCreg_08                uregs[8]
  77#define UCreg_07                uregs[7]
  78#define UCreg_06                uregs[6]
  79#define UCreg_05                uregs[5]
  80#define UCreg_04                uregs[4]
  81#define UCreg_03                uregs[3]
  82#define UCreg_02                uregs[2]
  83#define UCreg_01                uregs[1]
  84#define UCreg_00                uregs[0]
  85#define UCreg_ORIG_00           uregs[33]
  86
  87#ifdef __KERNEL__
  88
  89#define user_mode(regs) \
  90        (processor_mode(regs) == USER_MODE)
  91
  92#define processor_mode(regs) \
  93        ((regs)->UCreg_asr & MODE_MASK)
  94
  95#define interrupts_enabled(regs) \
  96        (!((regs)->UCreg_asr & PSR_I_BIT))
  97
  98#define fast_interrupts_enabled(regs) \
  99        (!((regs)->UCreg_asr & PSR_R_BIT))
 100
 101/* Are the current registers suitable for user mode?
 102 * (used to maintain security in signal handlers)
 103 */
 104static inline int valid_user_regs(struct pt_regs *regs)
 105{
 106        unsigned long mode = regs->UCreg_asr & MODE_MASK;
 107
 108        /*
 109         * Always clear the R (REAL) bits
 110         */
 111        regs->UCreg_asr &= ~(PSR_R_BIT);
 112
 113        if ((regs->UCreg_asr & PSR_I_BIT) == 0) {
 114                if (mode == USER_MODE)
 115                        return 1;
 116        }
 117
 118        /*
 119         * Force ASR to something logical...
 120         */
 121        regs->UCreg_asr &= PSR_f | USER_MODE;
 122
 123        return 0;
 124}
 125
 126#define instruction_pointer(regs)       ((regs)->UCreg_pc)
 127
 128#endif /* __KERNEL__ */
 129
 130#endif /* __ASSEMBLY__ */
 131
 132#endif
 133
 134