arch/arm/include/asm/ptrace.h

   1 /*
   2  *  arch/arm/include/asm/ptrace.h
   3  *
   4  *  Copyright (C) 1996-2003 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #ifndef __ASM_ARM_PTRACE_H
  11 #define __ASM_ARM_PTRACE_H
  12
  13 #include <asm/hwcap.h>
  14
  15 #define PTRACE_GETREGS          12
  16 #define PTRACE_SETREGS          13
  17 #define PTRACE_GETFPREGS        14
  18 #define PTRACE_SETFPREGS        15
  19 /* PTRACE_ATTACH is 16 */
  20 /* PTRACE_DETACH is 17 */
  21 #define PTRACE_GETWMMXREGS      18
  22 #define PTRACE_SETWMMXREGS      19
  23 /* 20 is unused */
  24 #define PTRACE_OLDSETOPTIONS    21
  25 #define PTRACE_GET_THREAD_AREA  22
  26 #define PTRACE_SET_SYSCALL      23
  27 /* PTRACE_SYSCALL is 24 */
  28 #define PTRACE_GETCRUNCHREGS    25
  29 #define PTRACE_SETCRUNCHREGS    26
  30
  31 /*
  32  * PSR bits
  33  */
  34 #define USR26_MODE      0x00000000
  35 #define FIQ26_MODE      0x00000001
  36 #define IRQ26_MODE      0x00000002
  37 #define SVC26_MODE      0x00000003
  38 #define USR_MODE        0x00000010
  39 #define FIQ_MODE        0x00000011
  40 #define IRQ_MODE        0x00000012
  41 #define SVC_MODE        0x00000013
  42 #define ABT_MODE        0x00000017
  43 #define UND_MODE        0x0000001b
  44 #define SYSTEM_MODE     0x0000001f
  45 #define MODE32_BIT      0x00000010
  46 #define MODE_MASK       0x0000001f
  47 #define PSR_T_BIT       0x00000020
  48 #define PSR_F_BIT       0x00000040
  49 #define PSR_I_BIT       0x00000080
  50 #define PSR_A_BIT       0x00000100
  51 #define PSR_J_BIT       0x01000000
  52 #define PSR_Q_BIT       0x08000000
  53 #define PSR_V_BIT       0x10000000
  54 #define PSR_C_BIT       0x20000000
  55 #define PSR_Z_BIT       0x40000000
  56 #define PSR_N_BIT       0x80000000
  57
  58 /*
  59  * Groups of PSR bits
  60  */
  61 #define PSR_f           0xff000000      /* Flags                */
  62 #define PSR_s           0x00ff0000      /* Status               */
  63 #define PSR_x           0x0000ff00      /* Extension            */
  64 #define PSR_c           0x000000ff      /* Control              */
  65
  66 #ifndef __ASSEMBLY__
  67
  68 /*
  69  * This struct defines the way the registers are stored on the
  70  * stack during a system call.  Note that sizeof(struct pt_regs)
  71  * has to be a multiple of 8.
  72  */
  73 struct pt_regs {
  74         long uregs[18];
  75 };
  76
  77 #define ARM_cpsr        uregs[16]
  78 #define ARM_pc          uregs[15]
  79 #define ARM_lr          uregs[14]
  80 #define ARM_sp          uregs[13]
  81 #define ARM_ip          uregs[12]
  82 #define ARM_fp          uregs[11]
  83 #define ARM_r10         uregs[10]
  84 #define ARM_r9          uregs[9]
  85 #define ARM_r8          uregs[8]
  86 #define ARM_r7          uregs[7]
  87 #define ARM_r6          uregs[6]
  88 #define ARM_r5          uregs[5]
  89 #define ARM_r4          uregs[4]
  90 #define ARM_r3          uregs[3]
  91 #define ARM_r2          uregs[2]
  92 #define ARM_r1          uregs[1]
  93 #define ARM_r0          uregs[0]
  94 #define ARM_ORIG_r0     uregs[17]
  95
  96 #ifdef __KERNEL__
  97
  98 #define user_mode(regs) \
  99         (((regs)->ARM_cpsr & 0xf) == 0)
 100
 101 #ifdef CONFIG_ARM_THUMB
 102 #define thumb_mode(regs) \
 103         (((regs)->ARM_cpsr & PSR_T_BIT))
 104 #else
 105 #define thumb_mode(regs) (0)
 106 #endif
 107
 108 #define isa_mode(regs) \
 109         ((((regs)->ARM_cpsr & PSR_J_BIT) >> 23) | \
 110          (((regs)->ARM_cpsr & PSR_T_BIT) >> 5))
 111
 112 #define processor_mode(regs) \
 113         ((regs)->ARM_cpsr & MODE_MASK)
 114
 115 #define interrupts_enabled(regs) \
 116         (!((regs)->ARM_cpsr & PSR_I_BIT))
 117
 118 #define fast_interrupts_enabled(regs) \
 119         (!((regs)->ARM_cpsr & PSR_F_BIT))
 120
 121 /* Are the current registers suitable for user mode?
 122  * (used to maintain security in signal handlers)
 123  */
 124 static inline int valid_user_regs(struct pt_regs *regs)
 125 {
 126         if (user_mode(regs) && (regs->ARM_cpsr & PSR_I_BIT) == 0) {
 127                 regs->ARM_cpsr &= ~(PSR_F_BIT | PSR_A_BIT);
 128                 return 1;
 129         }
 130
 131         /*
 132          * Force CPSR to something logical...
 133          */
 134         regs->ARM_cpsr &= PSR_f | PSR_s | (PSR_x & ~PSR_A_BIT) | PSR_T_BIT | MODE32_BIT;
 135         if (!(elf_hwcap & HWCAP_26BIT))
 136                 regs->ARM_cpsr |= USR_MODE;
 137
 138         return 0;
 139 }
 140
 141 #define instruction_pointer(regs)       (regs)->ARM_pc
 142
 143 #ifdef CONFIG_SMP
 144 extern unsigned long profile_pc(struct pt_regs *regs);
 145 #else
 146 #define profile_pc(regs) instruction_pointer(regs)
 147 #endif
 148
 149 #define predicate(x)            ((x) & 0xf0000000)
 150 #define PREDICATE_ALWAYS        0xe0000000
 151
 152 #endif /* __KERNEL__ */
 153
 154 #endif /* __ASSEMBLY__ */
 155
 156 #endif
 157