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#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.

 * Note: the "_overhead" and "_underhead" spaces are stack locations

 * used by called routines.  Because of the way the PowerPC ABI

 * specifies the function prologue/epilogue, registers can be

 * saved in stack locations which are below the current stack

 * pointer (_underhead).  If an interrupt occurs during this

 * [albeit] small time interval, registers which were saved on

 * the stack could be trashed by the interrupt save code.  The

 * "_underhead" leaves a hole just in case this happens.  It also

 * wastes 80 bytes of stack if it doesn't!  Similarly, the called

 * routine stores some information "above" the stack pointer before

 * if gets adjusted.  This is covered by the "_overhead" field

 * and [thankfully] is not totally wasted.

 *

 */

struct pt_regs {

        unsigned long _overhead[14]; /* Callee's SP,LR,params */

        unsigned long gpr[32];

        unsigned long nip;

        unsigned long msr;

        unsigned long ctr;

        unsigned long link;

        unsigned long ccr;

        unsigned long xer;

        unsigned long dar;      /* Fault registers */

        unsigned long dsisr;

        unsigned long hash1, hash2;

        unsigned long imiss, dmiss;

        unsigned long icmp, dcmp;

        unsigned long orig_gpr3; /* Used for restarting system calls */

        unsigned long result;    /* Result of a system call */

        double        fpr[4];    /* Caution! Only FP0-FP3 save on interrupts */

        double        fpcsr;

        unsigned long trap;     /* Reason for being here */

        unsigned long marker;   /* Should have DEADDEAD */

        unsigned long _underhead[20]; /* Callee's register save area */

        unsigned long edx;      /* for binfmt_elf.c which wants edx */

};

#define instruction_pointer(regs) ((regs)->nip)

#define user_mode(regs) ((regs)->msr & 0x4000)

#ifdef KERNEL

extern void show_regs(struct pt_regs *);

#endif

/* Offsets used by 'ptrace' system call interface */

/* Note: these should correspond to gpr[x]        */

#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

#define PT_ORIG_R3 34

#define PT_CTR  35

#define PT_LNK  36

#define PT_XER  37

#define PT_CCR  38

#define PT_FPR0 48

#endif