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ptrace.h

/*
 *  arch/arm/include/asm/ptrace.h
 *
 *  Copyright (C) 1996-2003 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_ARM_PTRACE_H
#define __ASM_ARM_PTRACE_H

#include <asm/hwcap.h>

#define PTRACE_GETREGS        12
#define PTRACE_SETREGS        13
#define PTRACE_GETFPREGS      14
#define PTRACE_SETFPREGS      15
/* PTRACE_ATTACH is 16 */
/* PTRACE_DETACH is 17 */
#define PTRACE_GETWMMXREGS    18
#define PTRACE_SETWMMXREGS    19
/* 20 is unused */
#define PTRACE_OLDSETOPTIONS  21
#define PTRACE_GET_THREAD_AREA      22
#define PTRACE_SET_SYSCALL    23
/* PTRACE_SYSCALL is 24 */
#define PTRACE_GETCRUNCHREGS  25
#define PTRACE_SETCRUNCHREGS  26

/*
 * PSR bits
 */
#define USR26_MODE      0x00000000
#define FIQ26_MODE      0x00000001
#define IRQ26_MODE      0x00000002
#define SVC26_MODE      0x00000003
#define USR_MODE  0x00000010
#define FIQ_MODE  0x00000011
#define IRQ_MODE  0x00000012
#define SVC_MODE  0x00000013
#define ABT_MODE  0x00000017
#define UND_MODE  0x0000001b
#define SYSTEM_MODE     0x0000001f
#define MODE32_BIT      0x00000010
#define MODE_MASK 0x0000001f
#define PSR_T_BIT 0x00000020
#define PSR_F_BIT 0x00000040
#define PSR_I_BIT 0x00000080
#define PSR_A_BIT 0x00000100
#define PSR_J_BIT 0x01000000
#define PSR_Q_BIT 0x08000000
#define PSR_V_BIT 0x10000000
#define PSR_C_BIT 0x20000000
#define PSR_Z_BIT 0x40000000
#define PSR_N_BIT 0x80000000
#define PCMASK          0

/*
 * Groups of PSR bits
 */
#define PSR_f           0xff000000  /* Flags          */
#define PSR_s           0x00ff0000  /* Status         */
#define PSR_x           0x0000ff00  /* Extension            */
#define PSR_c           0x000000ff  /* Control        */

#ifndef __ASSEMBLY__

/*
 * This struct defines the way the registers are stored on the
 * stack during a system call.  Note that sizeof(struct pt_regs)
 * has to be a multiple of 8.
 */
struct pt_regs {
      long uregs[18];
};

#define ARM_cpsr  uregs[16]
#define ARM_pc          uregs[15]
#define ARM_lr          uregs[14]
#define ARM_sp          uregs[13]
#define ARM_ip          uregs[12]
#define ARM_fp          uregs[11]
#define ARM_r10         uregs[10]
#define ARM_r9          uregs[9]
#define ARM_r8          uregs[8]
#define ARM_r7          uregs[7]
#define ARM_r6          uregs[6]
#define ARM_r5          uregs[5]
#define ARM_r4          uregs[4]
#define ARM_r3          uregs[3]
#define ARM_r2          uregs[2]
#define ARM_r1          uregs[1]
#define ARM_r0          uregs[0]
#define ARM_ORIG_r0     uregs[17]

#ifdef __KERNEL__

#define user_mode(regs) \
      (((regs)->ARM_cpsr & 0xf) == 0)

#ifdef CONFIG_ARM_THUMB
#define thumb_mode(regs) \
      (((regs)->ARM_cpsr & PSR_T_BIT))
#else
#define thumb_mode(regs) (0)
#endif

#define isa_mode(regs) \
      ((((regs)->ARM_cpsr & PSR_J_BIT) >> 23) | \
       (((regs)->ARM_cpsr & PSR_T_BIT) >> 5))

#define processor_mode(regs) \
      ((regs)->ARM_cpsr & MODE_MASK)

#define interrupts_enabled(regs) \
      (!((regs)->ARM_cpsr & PSR_I_BIT))

#define fast_interrupts_enabled(regs) \
      (!((regs)->ARM_cpsr & PSR_F_BIT))

/* Are the current registers suitable for user mode?
 * (used to maintain security in signal handlers)
 */
static inline int valid_user_regs(struct pt_regs *regs)
{
      if (user_mode(regs) && (regs->ARM_cpsr & PSR_I_BIT) == 0) {
            regs->ARM_cpsr &= ~(PSR_F_BIT | PSR_A_BIT);
            return 1;
      }

      /*
       * Force CPSR to something logical...
       */
      regs->ARM_cpsr &= PSR_f | PSR_s | (PSR_x & ~PSR_A_BIT) | PSR_T_BIT | MODE32_BIT;
      if (!(elf_hwcap & HWCAP_26BIT))
            regs->ARM_cpsr |= USR_MODE;

      return 0;
}

#define pc_pointer(v) \
      ((v) & ~PCMASK)

#define instruction_pointer(regs) \
      (pc_pointer((regs)->ARM_pc))

#ifdef CONFIG_SMP
extern unsigned long profile_pc(struct pt_regs *regs);
#else
#define profile_pc(regs) instruction_pointer(regs)
#endif

#define predicate(x)          ((x) & 0xf0000000)
#define PREDICATE_ALWAYS      0xe0000000

#endif /* __KERNEL__ */

#endif /* __ASSEMBLY__ */

#endif


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