linux/include/asm-ppc64/ptrace.h

#ifndef _PPC64_PTRACE_H
#define _PPC64_PTRACE_H

/*
 * Copyright (C) 2001 PPC64 Team, IBM Corp
 *
 * 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/ppc64/kernel/ptrace.c.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifndef __ASSEMBLY__

struct pt_regs {
	unsigned long gpr[32];
	unsigned long nip;
	unsigned long msr;
	unsigned long orig_gpr3; /* Used for restarting system calls */
	unsigned long ctr;
	unsigned long link;
	unsigned long xer;
	unsigned long ccr;
	unsigned long softe;	/* Soft enabled/disabled */
	unsigned long trap;	/* Reason for being here */
	unsigned long dar;	/* Fault registers */
	unsigned long dsisr;
	unsigned long result;	/* Result of a system call */
};

struct pt_regs32 {
	unsigned int gpr[32];
	unsigned int nip;
	unsigned int msr;
	unsigned int orig_gpr3;	/* Used for restarting system calls */
	unsigned int ctr;
	unsigned int link;
	unsigned int xer;
	unsigned int ccr;
	unsigned int mq;	/* 601 only (not used at present) */
	unsigned int trap;	/* Reason for being here */
	unsigned int dar;	/* Fault registers */
	unsigned int dsisr;
	unsigned int result;	/* Result of a system call */
};

#ifdef __KERNEL__

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

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

#define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)

#define force_successful_syscall_return()   \
		(current_thread_info()->syscall_noerror = 1)

/*
 * We use the least-significant bit of the trap field to indicate
 * whether we have saved the full set of registers, or only a
 * partial set.  A 1 there means the partial set.
 */
#define FULL_REGS(regs)		(((regs)->trap & 1) == 0)
#define TRAP(regs)		((regs)->trap & ~0xF)
#define CHECK_FULL_REGS(regs)	BUG_ON(regs->trap & 1)

#endif /* __KERNEL__ */

#endif /* __ASSEMBLY__ */

#define STACK_FRAME_OVERHEAD	112	/* size of minimum stack frame */

/* Size of dummy stack frame allocated when calling signal handler. */
#define __SIGNAL_FRAMESIZE	128
#define __SIGNAL_FRAMESIZE32	64

/*
 * Offsets used by 'ptrace' system call interface.
 */
#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_SOFTE 39
#define PT_TRAP	40
#define PT_DAR	41
#define PT_DSISR 42
#define PT_RESULT 43

#define PT_FPR0	48

/*
 * Kernel and userspace will both use this PT_FPSCR value.  32-bit apps will
 * have visibility to the asm-ppc/ptrace.h header instead of this one.
 */
#define PT_FPSCR (PT_FPR0 + 32)	/* each FP reg occupies 1 slot in 64-bit space */

#ifdef __KERNEL__
#define PT_FPSCR32 (PT_FPR0 + 2*32 + 1)	/* each FP reg occupies 2 32-bit userspace slots */
#endif

#define PT_VR0 82	/* each Vector reg occupies 2 slots in 64-bit */
#define PT_VSCR (PT_VR0 + 32*2 + 1)
#define PT_VRSAVE (PT_VR0 + 33*2)

#ifdef __KERNEL__
#define PT_VR0_32 164	/* each Vector reg occupies 4 slots in 32-bit */
#define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
#define PT_VRSAVE_32 (PT_VR0 + 33*4)
#endif

/*
 * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go. 
 * The transfer totals 34 quadword.  Quadwords 0-31 contain the 
 * corresponding vector registers.  Quadword 32 contains the vscr as the 
 * last word (offset 12) within that quadword.  Quadword 33 contains the 
 * vrsave as the first word (offset 0) within the quadword.
 *
 * This definition of the VMX state is compatible with the current PPC32 
 * ptrace interface.  This allows signal handling and ptrace to use the same 
 * structures.  This also simplifies the implementation of a bi-arch 
 * (combined (32- and 64-bit) gdb.
 */
#define PTRACE_GETVRREGS	18
#define PTRACE_SETVRREGS	19

/*
 * While we dont have 64bit book E processors, we need to reserve the
 * relevant ptrace calls for 32bit compatibility.
 */
#if 0
#define PTRACE_GETEVRREGS       20
#define PTRACE_SETEVRREGS       21
#endif

/* Additional PTRACE requests implemented on PowerPC. */
#define PPC_PTRACE_GETREGS	0x99	/* Get GPRs 0 - 31 */
#define PPC_PTRACE_SETREGS	0x98	/* Set GPRs 0 - 31 */
#define PPC_PTRACE_GETFPREGS	0x97	/* Get FPRs 0 - 31 */
#define PPC_PTRACE_SETFPREGS	0x96	/* Set FPRs 0 - 31 */

/* Calls to trace a 64bit program from a 32bit program */
#define PPC_PTRACE_PEEKTEXT_3264 0x95
#define PPC_PTRACE_PEEKDATA_3264 0x94
#define PPC_PTRACE_POKETEXT_3264 0x93
#define PPC_PTRACE_POKEDATA_3264 0x92
#define PPC_PTRACE_PEEKUSR_3264  0x91
#define PPC_PTRACE_POKEUSR_3264  0x90

#endif /* _PPC64_PTRACE_H */