text: #ifndef _PPC_PTRACE_H
  #define _PPC_PTRACE_H
  
  /*
   * This struct defines the way the registers are stored on the
   * kernel stack during a system call or other kernel entry.
   *
   * this should only contain volatile regs
   * since we can keep non-volatile in the thread_struct
   * should set this up when only volatiles are saved
   * by intr code.
   *
   * Since this is going on the stack, *CARE MUST BE TAKEN* to insure
   * that the overall structure is a multiple of 16 bytes in length.
   *
   * Note that the offsets of the fields in this struct correspond with
   * the PT_* values below.  This simplifies arch/ppc/kernel/ptrace.c.
   */
  
  #include <config.h>
  
  #ifndef __ASSEMBLY__
  #ifdef CONFIG_PPC64BRIDGE
  	#define PPC_REG unsigned long /*long*/
  #else
  	#define PPC_REG unsigned long
  #endif
  struct pt_regs {
  	PPC_REG gpr[32];
  	PPC_REG nip;
  	PPC_REG msr;
  	PPC_REG orig_gpr3;	/* Used for restarting system calls */
  	PPC_REG ctr;
  	PPC_REG link;
  	PPC_REG xer;
  	PPC_REG ccr;
  	PPC_REG mq;		/* 601 only (not used at present) */
  	/* Used on APUS to hold IPL value. */
  	PPC_REG trap;		/* Reason for being here */
  	PPC_REG dar;		/* Fault registers */
  	PPC_REG dsisr;
  	PPC_REG result;		/* Result of a system call */
  } __attribute__((packed)) CELL_STACK_FRAME_t;
  #endif
  
  #define STACK_FRAME_OVERHEAD	16	/* size of minimum stack frame */
  
  /* Size of stack frame allocated when calling signal handler. */
  #define __SIGNAL_FRAMESIZE	64
  
  #define instruction_pointer(regs) ((regs)->nip)
  #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
  
  /*
   * Offsets used by 'ptrace' system call interface.
   * These can't be changed without breaking binary compatibility
   * with MkLinux, etc.
   */
  #define PT_R0	0
  #define PT_R1	1
  #define PT_R2	2
  #define PT_R3	3
  #define PT_R4	4
  #define PT_R5	5
  #define PT_R6	6
  #define PT_R7	7
  #define PT_R8	8
  #define PT_R9	9
  #define PT_R10	10
  #define PT_R11	11
  #define PT_R12	12
  #define PT_R13	13
  #define PT_R14	14
  #define PT_R15	15
  #define PT_R16	16
  #define PT_R17	17
  #define PT_R18	18
  #define PT_R19	19
  #define PT_R20	20
  #define PT_R21	21
  #define PT_R22	22
  #define PT_R23	23
  #define PT_R24	24
  #define PT_R25	25
  #define PT_R26	26
  #define PT_R27	27
  #define PT_R28	28
  #define PT_R29	29
  #define PT_R30	30
  #define PT_R31	31
  
  #define PT_NIP	32
  #define PT_MSR	33
  #ifdef __KERNEL__
  	#define PT_ORIG_R3 34
  #endif
  #define PT_CTR	35
  #define PT_LNK	36
  #define PT_XER	37
  #define PT_CCR	38
  #define PT_MQ	39
  
  #define PT_FPR0	48	/* each FP reg occupies 2 slots in this space */
  #define PT_FPR31 (PT_FPR0 + 2*31)
  #define PT_FPSCR (PT_FPR0 + 2*32 + 1)
  
  #endif
  