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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
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