[linux-2.6-block.git] / arch / powerpc / include / asm / ptrace.h

#ifndef _ASM_POWERPC_PTRACE_H
#define _ASM_POWERPC_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/powerpc/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.
 */

#include <linux/types.h>

#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;
#ifdef __powerpc64__
	unsigned long softe;		/* Soft enabled/disabled */
#else
	unsigned long mq;		/* 601 only (not used at present) */
					/* Used on APUS to hold IPL value. */
#endif
	unsigned long trap;		/* Reason for being here */
	/* N.B. for critical exceptions on 4xx, the dar and dsisr
	   fields are overloaded to hold srr0 and srr1. */
	unsigned long dar;		/* Fault registers */
	unsigned long dsisr;		/* on 4xx/Book-E used for ESR */
	unsigned long result;		/* Result of a system call */
};

#endif /* __ASSEMBLY__ */

#ifdef __KERNEL__

#ifdef __powerpc64__

#define STACK_FRAME_OVERHEAD	112	/* size of minimum stack frame */
#define STACK_FRAME_LR_SAVE	2	/* Location of LR in stack frame */
#define STACK_FRAME_REGS_MARKER	ASM_CONST(0x7265677368657265)
#define STACK_INT_FRAME_SIZE	(sizeof(struct pt_regs) + \
					STACK_FRAME_OVERHEAD + 288)
#define STACK_FRAME_MARKER	12

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

#else /* __powerpc64__ */

#define STACK_FRAME_OVERHEAD	16	/* size of minimum stack frame */
#define STACK_FRAME_LR_SAVE	1	/* Location of LR in stack frame */
#define STACK_FRAME_REGS_MARKER	ASM_CONST(0x72656773)
#define STACK_INT_FRAME_SIZE	(sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
#define STACK_FRAME_MARKER	2

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

#endif /* __powerpc64__ */

#ifndef __ASSEMBLY__

#define GET_IP(regs)		((regs)->nip)
#define GET_USP(regs)		((regs)->gpr[1])
#define GET_FP(regs)		(0)
#define SET_FP(regs, val)

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

#include <asm-generic/ptrace.h>

#define kernel_stack_pointer(regs) ((regs)->gpr[1])
static inline int is_syscall_success(struct pt_regs *regs)
{
	return !(regs->ccr & 0x10000000);
}

static inline long regs_return_value(struct pt_regs *regs)
{
	if (is_syscall_success(regs))
		return regs->gpr[3];
	else
		return -regs->gpr[3];
}

#ifdef __powerpc64__
#define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
#else
#define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
#endif

#define force_successful_syscall_return()   \
	do { \
		set_thread_flag(TIF_NOERROR); \
	} while(0)

struct task_struct;
extern unsigned long ptrace_get_reg(struct task_struct *task, int regno);
extern int ptrace_put_reg(struct task_struct *task, int regno,
			  unsigned long data);

/*
 * 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.
 * On 4xx we use the next bit to indicate whether the exception
 * is a critical exception (1 means it is).
 */
#define FULL_REGS(regs)		(((regs)->trap & 1) == 0)
#ifndef __powerpc64__
#define IS_CRITICAL_EXC(regs)	(((regs)->trap & 2) != 0)
#define IS_MCHECK_EXC(regs)	(((regs)->trap & 4) != 0)
#define IS_DEBUG_EXC(regs)	(((regs)->trap & 8) != 0)
#endif /* ! __powerpc64__ */
#define TRAP(regs)		((regs)->trap & ~0xF)
#ifdef __powerpc64__
#define NV_REG_POISON		0xdeadbeefdeadbeefUL
#define CHECK_FULL_REGS(regs)	BUG_ON(regs->trap & 1)
#else
#define NV_REG_POISON		0xdeadbeef
#define CHECK_FULL_REGS(regs)						      \
do {									      \
	if ((regs)->trap & 1)						      \
		printk(KERN_CRIT "%s: partial register set\n", __func__); \
} while (0)
#endif /* __powerpc64__ */

#define arch_has_single_step()	(1)
#define arch_has_block_step()	(!cpu_has_feature(CPU_FTR_601))
#define ARCH_HAS_USER_SINGLE_STEP_INFO

/*
 * kprobe-based event tracer support
 */

#include <linux/stddef.h>
#include <linux/thread_info.h>
extern int regs_query_register_offset(const char *name);
extern const char *regs_query_register_name(unsigned int offset);
#define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))

/**
 * regs_get_register() - get register value from its offset
 * @regs:	   pt_regs from which register value is gotten
 * @offset:    offset number of the register.
 *
 * regs_get_register returns the value of a register whose offset from @regs.
 * The @offset is the offset of the register in struct pt_regs.
 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
 */
static inline unsigned long regs_get_register(struct pt_regs *regs,
						unsigned int offset)
{
	if (unlikely(offset > MAX_REG_OFFSET))
		return 0;
	return *(unsigned long *)((unsigned long)regs + offset);
}

/**
 * regs_within_kernel_stack() - check the address in the stack
 * @regs:      pt_regs which contains kernel stack pointer.
 * @addr:      address which is checked.
 *
 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
 * If @addr is within the kernel stack, it returns true. If not, returns false.
 */

static inline bool regs_within_kernel_stack(struct pt_regs *regs,
						unsigned long addr)
{
	return ((addr & ~(THREAD_SIZE - 1))  ==
		(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
}

/**
 * regs_get_kernel_stack_nth() - get Nth entry of the stack
 * @regs:	pt_regs which contains kernel stack pointer.
 * @n:		stack entry number.
 *
 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
 * this returns 0.
 */
static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
						      unsigned int n)
{
	unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
	addr += n;
	if (regs_within_kernel_stack(regs, (unsigned long)addr))
		return *addr;
	else
		return 0;
}

#endif /* __ASSEMBLY__ */

#endif /* __KERNEL__ */

/*
 * 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
#define PT_ORIG_R3 34
#define PT_CTR	35
#define PT_LNK	36
#define PT_XER	37
#define PT_CCR	38
#ifndef __powerpc64__
#define PT_MQ	39
#else
#define PT_SOFTE 39
#endif
#define PT_TRAP	40
#define PT_DAR	41
#define PT_DSISR 42
#define PT_RESULT 43
#define PT_REGS_COUNT 44

#define PT_FPR0	48	/* each FP reg occupies 2 slots in this space */

#ifndef __powerpc64__

#define PT_FPR31 (PT_FPR0 + 2*31)
#define PT_FPSCR (PT_FPR0 + 2*32 + 1)

#else /* __powerpc64__ */

#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

/*
 * Only store first 32 VSRs here. The second 32 VSRs in VR0-31
 */
#define PT_VSR0 150	/* each VSR reg occupies 2 slots in 64-bit */
#define PT_VSR31 (PT_VSR0 + 2*31)
#ifdef __KERNEL__
#define PT_VSR0_32 300 	/* each VSR reg occupies 4 slots in 32-bit */
#endif
#endif /* __powerpc64__ */

/*
 * 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

/* Get/set all the upper 32-bits of the SPE registers, accumulator, and
 * spefscr, in one go */
#define PTRACE_GETEVRREGS	20
#define PTRACE_SETEVRREGS	21

/* Get the first 32 128bit VSX registers */
#define PTRACE_GETVSRREGS	27
#define PTRACE_SETVSRREGS	28

/*
 * Get or set a debug register. The first 16 are DABR registers and the
 * second 16 are IABR registers.
 */
#define PTRACE_GET_DEBUGREG	25
#define PTRACE_SET_DEBUGREG	26

/* (new) PTRACE requests using the same numbers as x86 and the same
 * argument ordering. Additionally, they support more registers too
 */
#define PTRACE_GETREGS            12
#define PTRACE_SETREGS            13
#define PTRACE_GETFPREGS          14
#define PTRACE_SETFPREGS          15
#define PTRACE_GETREGS64	  22
#define PTRACE_SETREGS64	  23

/* 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

#define PTRACE_SINGLEBLOCK	0x100	/* resume execution until next branch */

#define PPC_PTRACE_GETHWDBGINFO	0x89
#define PPC_PTRACE_SETHWDEBUG	0x88
#define PPC_PTRACE_DELHWDEBUG	0x87

#ifndef __ASSEMBLY__

struct ppc_debug_info {
	__u32 version;			/* Only version 1 exists to date */
	__u32 num_instruction_bps;
	__u32 num_data_bps;
	__u32 num_condition_regs;
	__u32 data_bp_alignment;
	__u32 sizeof_condition;		/* size of the DVC register */
	__u64 features;
};

#endif /* __ASSEMBLY__ */

/*
 * features will have bits indication whether there is support for:
 */
#define PPC_DEBUG_FEATURE_INSN_BP_RANGE		0x0000000000000001
#define PPC_DEBUG_FEATURE_INSN_BP_MASK		0x0000000000000002
#define PPC_DEBUG_FEATURE_DATA_BP_RANGE		0x0000000000000004
#define PPC_DEBUG_FEATURE_DATA_BP_MASK		0x0000000000000008

#ifndef __ASSEMBLY__

struct ppc_hw_breakpoint {
	__u32 version;		/* currently, version must be 1 */
	__u32 trigger_type;	/* only some combinations allowed */
	__u32 addr_mode;	/* address match mode */
	__u32 condition_mode;	/* break/watchpoint condition flags */
	__u64 addr;		/* break/watchpoint address */
	__u64 addr2;		/* range end or mask */
	__u64 condition_value;	/* contents of the DVC register */
};

#endif /* __ASSEMBLY__ */

/*
 * Trigger Type
 */
#define PPC_BREAKPOINT_TRIGGER_EXECUTE	0x00000001
#define PPC_BREAKPOINT_TRIGGER_READ	0x00000002
#define PPC_BREAKPOINT_TRIGGER_WRITE	0x00000004
#define PPC_BREAKPOINT_TRIGGER_RW	\
	(PPC_BREAKPOINT_TRIGGER_READ | PPC_BREAKPOINT_TRIGGER_WRITE)

/*
 * Address Mode
 */
#define PPC_BREAKPOINT_MODE_EXACT		0x00000000
#define PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE	0x00000001
#define PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE	0x00000002
#define PPC_BREAKPOINT_MODE_MASK		0x00000003

/*
 * Condition Mode
 */
#define PPC_BREAKPOINT_CONDITION_MODE	0x00000003
#define PPC_BREAKPOINT_CONDITION_NONE	0x00000000
#define PPC_BREAKPOINT_CONDITION_AND	0x00000001
#define PPC_BREAKPOINT_CONDITION_EXACT	PPC_BREAKPOINT_CONDITION_AND
#define PPC_BREAKPOINT_CONDITION_OR	0x00000002
#define PPC_BREAKPOINT_CONDITION_AND_OR	0x00000003
#define PPC_BREAKPOINT_CONDITION_BE_ALL	0x00ff0000
#define PPC_BREAKPOINT_CONDITION_BE_SHIFT	16
#define PPC_BREAKPOINT_CONDITION_BE(n)	\
	(1<<((n)+PPC_BREAKPOINT_CONDITION_BE_SHIFT))

#endif /* _ASM_POWERPC_PTRACE_H */
Commit	Line	Data
da80d460 SR	1	#ifndef _ASM_POWERPC_PTRACE_H
da80d460 SR	2	#define _ASM_POWERPC_PTRACE_H
1da177e4 LT	3
	4	/*
	5	* Copyright (C) 2001 PPC64 Team, IBM Corp
	6	*
	7	* This struct defines the way the registers are stored on the
	8	* kernel stack during a system call or other kernel entry.
	9	*
	10	* this should only contain volatile regs
	11	* since we can keep non-volatile in the thread_struct
	12	* should set this up when only volatiles are saved
	13	* by intr code.
	14	*
	15	* Since this is going on the stack, CARE MUST BE TAKEN to insure
	16	* that the overall structure is a multiple of 16 bytes in length.
	17	*
	18	* Note that the offsets of the fields in this struct correspond with
da80d460	19	* the PT_* values below. This simplifies arch/powerpc/kernel/ptrace.c.
1da177e4 LT	20	*
	21	* This program is free software; you can redistribute it and/or
	22	* modify it under the terms of the GNU General Public License
	23	* as published by the Free Software Foundation; either version
	24	* 2 of the License, or (at your option) any later version.
	25	*/
	26
3162d92d	27	#include <linux/types.h>
3162d92d	28
1da177e4	29	#ifndef __ASSEMBLY__
a0987224	30
1da177e4	31	struct pt_regs {
a0987224 AB	32	unsigned long gpr[32];
	33	unsigned long nip;
	34	unsigned long msr;
da80d460	35	unsigned long orig_gpr3; /* Used for restarting system calls */
a0987224 AB	36	unsigned long ctr;
	37	unsigned long link;
	38	unsigned long xer;
	39	unsigned long ccr;
da80d460 SR	40	#ifdef __powerpc64__
	41	unsigned long softe; /* Soft enabled/disabled */
	42	#else
	43	unsigned long mq; /* 601 only (not used at present) */
	44	/* Used on APUS to hold IPL value. */
	45	#endif
	46	unsigned long trap; /* Reason for being here */
	47	/* N.B. for critical exceptions on 4xx, the dar and dsisr
	48	fields are overloaded to hold srr0 and srr1. */
	49	unsigned long dar; /* Fault registers */
	50	unsigned long dsisr; /* on 4xx/Book-E used for ESR */
	51	unsigned long result; /* Result of a system call */
1da177e4 LT	52	};
1da177e4 LT	53
da80d460	54	#endif /* __ASSEMBLY__ */
1da177e4	55
a0987224 AB	56	#ifdef __KERNEL__
a0987224 AB	57
da80d460 SR	58	#ifdef __powerpc64__
	59
	60	#define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */
ec2b36b9 BH	61	#define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */
	62	#define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265)
	63	#define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + \
	64	STACK_FRAME_OVERHEAD + 288)
	65	#define STACK_FRAME_MARKER 12
da80d460 SR	66
	67	/* Size of dummy stack frame allocated when calling signal handler. */
	68	#define __SIGNAL_FRAMESIZE 128
	69	#define __SIGNAL_FRAMESIZE32 64
	70
	71	#else /* __powerpc64__ */
	72
	73	#define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */
ec2b36b9 BH	74	#define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */
	75	#define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773)
	76	#define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
	77	#define STACK_FRAME_MARKER 2
da80d460 SR	78
	79	/* Size of stack frame allocated when calling signal handler. */
	80	#define __SIGNAL_FRAMESIZE 64
	81
	82	#endif /* __powerpc64__ */
a0987224	83
da80d460 SR	84	#ifndef __ASSEMBLY__
da80d460 SR	85
e6289427 SD	86	#define GET_IP(regs) ((regs)->nip)
	87	#define GET_USP(regs) ((regs)->gpr[1])
	88	#define GET_FP(regs) (0)
	89	#define SET_FP(regs, val)
	90
	91	#ifdef CONFIG_SMP
	92	extern unsigned long profile_pc(struct pt_regs *regs);
	93	#define profile_pc profile_pc
	94	#endif
	95
	96	#include <asm-generic/ptrace.h>
	97
359e4284	98	#define kernel_stack_pointer(regs) ((regs)->gpr[1])
d7e7528b EP	99	static inline int is_syscall_success(struct pt_regs *regs)
	100	{
	101	return !(regs->ccr & 0x10000000);
	102	}
	103
	104	static inline long regs_return_value(struct pt_regs *regs)
	105	{
	106	if (is_syscall_success(regs))
	107	return regs->gpr[3];
	108	else
	109	return -regs->gpr[3];
	110	}
b3f827cb	111
da80d460	112	#ifdef __powerpc64__
1da177e4	113	#define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
da80d460 SR	114	#else
	115	#define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
	116	#endif
1da177e4 LT	117
1da177e4 LT	118	#define force_successful_syscall_return() \
da80d460	119	do { \
401d1f02	120	set_thread_flag(TIF_NOERROR); \
da80d460	121	} while(0)
1da177e4	122
865418d8 BH	123	struct task_struct;
	124	extern unsigned long ptrace_get_reg(struct task_struct *task, int regno);
	125	extern int ptrace_put_reg(struct task_struct *task, int regno,
	126	unsigned long data);
	127
1da177e4 LT	128	/*
	129	* We use the least-significant bit of the trap field to indicate
	130	* whether we have saved the full set of registers, or only a
	131	* partial set. A 1 there means the partial set.
da80d460 SR	132	* On 4xx we use the next bit to indicate whether the exception
da80d460 SR	133	* is a critical exception (1 means it is).
1da177e4 LT	134	*/
1da177e4 LT	135	#define FULL_REGS(regs) (((regs)->trap & 1) == 0)
da80d460	136	#ifndef __powerpc64__
47c0bd1a BH	137	#define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0)
47c0bd1a BH	138	#define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0)
663276b7	139	#define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)
da80d460	140	#endif /* ! __powerpc64__ */
1da177e4	141	#define TRAP(regs) ((regs)->trap & ~0xF)
da80d460	142	#ifdef __powerpc64__
a71f5d5d	143	#define NV_REG_POISON 0xdeadbeefdeadbeefUL
1da177e4	144	#define CHECK_FULL_REGS(regs) BUG_ON(regs->trap & 1)
da80d460	145	#else
a71f5d5d	146	#define NV_REG_POISON 0xdeadbeef
da80d460 SR	147	#define CHECK_FULL_REGS(regs) \
	148	do { \
	149	if ((regs)->trap & 1) \
653c0316	150	printk(KERN_CRIT "%s: partial register set\n", __func__); \
da80d460 SR	151	} while (0)
da80d460 SR	152	#endif /* __powerpc64__ */
a0987224	153
2a84b0d7	154	#define arch_has_single_step() (1)
ec097c84	155	#define arch_has_block_step() (!cpu_has_feature(CPU_FTR_601))
25baa35b ON	156	#define ARCH_HAS_USER_SINGLE_STEP_INFO
25baa35b ON	157
359e4284 MS	158	/*
	159	* kprobe-based event tracer support
	160	*/
	161
	162	#include <linux/stddef.h>
	163	#include <linux/thread_info.h>
	164	extern int regs_query_register_offset(const char *name);
	165	extern const char *regs_query_register_name(unsigned int offset);
	166	#define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))
	167
	168	/**
	169	* regs_get_register() - get register value from its offset
	170	* @regs: pt_regs from which register value is gotten
	171	* @offset: offset number of the register.
	172	*
	173	* regs_get_register returns the value of a register whose offset from @regs.
	174	* The @offset is the offset of the register in struct pt_regs.
	175	* If @offset is bigger than MAX_REG_OFFSET, this returns 0.
	176	*/
	177	static inline unsigned long regs_get_register(struct pt_regs *regs,
	178	unsigned int offset)
	179	{
	180	if (unlikely(offset > MAX_REG_OFFSET))
	181	return 0;
	182	return (unsigned long )((unsigned long)regs + offset);
	183	}
	184
	185	/**
	186	* regs_within_kernel_stack() - check the address in the stack
	187	* @regs: pt_regs which contains kernel stack pointer.
	188	* @addr: address which is checked.
	189	*
	190	* regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
	191	* If @addr is within the kernel stack, it returns true. If not, returns false.
	192	*/
	193
	194	static inline bool regs_within_kernel_stack(struct pt_regs *regs,
	195	unsigned long addr)
	196	{
	197	return ((addr & ~(THREAD_SIZE - 1)) ==
	198	(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
	199	}
	200
	201	/**
	202	* regs_get_kernel_stack_nth() - get Nth entry of the stack
	203	* @regs: pt_regs which contains kernel stack pointer.
	204	* @n: stack entry number.
	205	*
	206	* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
	207	* is specified by @regs. If the @n th entry is NOT in the kernel stack,
	208	* this returns 0.
	209	*/
	210	static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
	211	unsigned int n)
	212	{
	213	unsigned long addr = (unsigned long )kernel_stack_pointer(regs);
	214	addr += n;
	215	if (regs_within_kernel_stack(regs, (unsigned long)addr))
	216	return *addr;
	217	else
	218	return 0;
	219	}
	220
a0987224 AB	221	#endif /* __ASSEMBLY__ */
a0987224 AB	222
da80d460	223	#endif /* __KERNEL__ */
a0987224	224
1da177e4 LT	225	/*
1da177e4 LT	226	* Offsets used by 'ptrace' system call interface.
da80d460 SR	227	* These can't be changed without breaking binary compatibility
da80d460 SR	228	* with MkLinux, etc.
1da177e4 LT	229	*/
	230	#define PT_R0 0
	231	#define PT_R1 1
	232	#define PT_R2 2
	233	#define PT_R3 3
	234	#define PT_R4 4
	235	#define PT_R5 5
	236	#define PT_R6 6
	237	#define PT_R7 7
	238	#define PT_R8 8
	239	#define PT_R9 9
	240	#define PT_R10 10
	241	#define PT_R11 11
	242	#define PT_R12 12
	243	#define PT_R13 13
	244	#define PT_R14 14
	245	#define PT_R15 15
	246	#define PT_R16 16
	247	#define PT_R17 17
	248	#define PT_R18 18
	249	#define PT_R19 19
	250	#define PT_R20 20
	251	#define PT_R21 21
	252	#define PT_R22 22
	253	#define PT_R23 23
	254	#define PT_R24 24
	255	#define PT_R25 25
	256	#define PT_R26 26
	257	#define PT_R27 27
	258	#define PT_R28 28
	259	#define PT_R29 29
	260	#define PT_R30 30
	261	#define PT_R31 31
	262
	263	#define PT_NIP 32
	264	#define PT_MSR 33
1da177e4	265	#define PT_ORIG_R3 34
1da177e4 LT	266	#define PT_CTR 35
	267	#define PT_LNK 36
	268	#define PT_XER 37
	269	#define PT_CCR 38
da80d460 SR	270	#ifndef __powerpc64__
	271	#define PT_MQ 39
	272	#else
1da177e4	273	#define PT_SOFTE 39
e17666ba	274	#endif
a0987224 AB	275	#define PT_TRAP 40
	276	#define PT_DAR 41
	277	#define PT_DSISR 42
1da177e4	278	#define PT_RESULT 43
e17666ba	279	#define PT_REGS_COUNT 44
1da177e4	280
da80d460 SR	281	#define PT_FPR0 48 /* each FP reg occupies 2 slots in this space */
	282
	283	#ifndef __powerpc64__
	284
	285	#define PT_FPR31 (PT_FPR0 + 2*31)
	286	#define PT_FPSCR (PT_FPR0 + 2*32 + 1)
	287
	288	#else /* __powerpc64__ */
1da177e4	289
a0987224	290	#define PT_FPSCR (PT_FPR0 + 32) /* each FP reg occupies 1 slot in 64-bit space */
1da177e4 LT	291
1da177e4 LT	292	#ifdef __KERNEL__
a0987224	293	#define PT_FPSCR32 (PT_FPR0 + 232 + 1) / each FP reg occupies 2 32-bit userspace slots */
1da177e4 LT	294	#endif
	295
	296	#define PT_VR0 82 /* each Vector reg occupies 2 slots in 64-bit */
	297	#define PT_VSCR (PT_VR0 + 32*2 + 1)
	298	#define PT_VRSAVE (PT_VR0 + 33*2)
	299
	300	#ifdef __KERNEL__
	301	#define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */
	302	#define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
	303	#define PT_VRSAVE_32 (PT_VR0 + 33*4)
	304	#endif
	305
ce48b210 MN	306	/*
	307	* Only store first 32 VSRs here. The second 32 VSRs in VR0-31
	308	*/
	309	#define PT_VSR0 150 /* each VSR reg occupies 2 slots in 64-bit */
	310	#define PT_VSR31 (PT_VSR0 + 2*31)
	311	#ifdef __KERNEL__
	312	#define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */
	313	#endif
da80d460 SR	314	#endif /* __powerpc64__ */
da80d460 SR	315
1da177e4	316	/*
da80d460 SR	317	* Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
	318	* The transfer totals 34 quadword. Quadwords 0-31 contain the
	319	* corresponding vector registers. Quadword 32 contains the vscr as the
	320	* last word (offset 12) within that quadword. Quadword 33 contains the
1da177e4 LT	321	* vrsave as the first word (offset 0) within the quadword.
1da177e4 LT	322	*
da80d460 SR	323	* This definition of the VMX state is compatible with the current PPC32
	324	* ptrace interface. This allows signal handling and ptrace to use the same
	325	* structures. This also simplifies the implementation of a bi-arch
1da177e4 LT	326	* (combined (32- and 64-bit) gdb.
	327	*/
	328	#define PTRACE_GETVRREGS 18
	329	#define PTRACE_SETVRREGS 19
	330
da80d460 SR	331	/* Get/set all the upper 32-bits of the SPE registers, accumulator, and
	332	* spefscr, in one go */
	333	#define PTRACE_GETEVRREGS 20
	334	#define PTRACE_SETEVRREGS 21
1da177e4	335
ce48b210 MN	336	/* Get the first 32 128bit VSX registers */
	337	#define PTRACE_GETVSRREGS 27
	338	#define PTRACE_SETVSRREGS 28
	339
a94d3085 AB	340	/*
	341	* Get or set a debug register. The first 16 are DABR registers and the
	342	* second 16 are IABR registers.
	343	*/
	344	#define PTRACE_GET_DEBUGREG 25
	345	#define PTRACE_SET_DEBUGREG 26
	346
e17666ba BH	347	/* (new) PTRACE requests using the same numbers as x86 and the same
	348	* argument ordering. Additionally, they support more registers too
	349	*/
	350	#define PTRACE_GETREGS 12
	351	#define PTRACE_SETREGS 13
	352	#define PTRACE_GETFPREGS 14
	353	#define PTRACE_SETFPREGS 15
	354	#define PTRACE_GETREGS64 22
	355	#define PTRACE_SETREGS64 23
	356
a0987224 AB	357	/* Calls to trace a 64bit program from a 32bit program */
	358	#define PPC_PTRACE_PEEKTEXT_3264 0x95
	359	#define PPC_PTRACE_PEEKDATA_3264 0x94
	360	#define PPC_PTRACE_POKETEXT_3264 0x93
	361	#define PPC_PTRACE_POKEDATA_3264 0x92
	362	#define PPC_PTRACE_PEEKUSR_3264 0x91
	363	#define PPC_PTRACE_POKEUSR_3264 0x90
1da177e4	364
ec097c84 RM	365	#define PTRACE_SINGLEBLOCK 0x100 /* resume execution until next branch */
ec097c84 RM	366
3162d92d DK	367	#define PPC_PTRACE_GETHWDBGINFO 0x89
	368	#define PPC_PTRACE_SETHWDEBUG 0x88
	369	#define PPC_PTRACE_DELHWDEBUG 0x87
	370
	371	#ifndef __ASSEMBLY__
	372
	373	struct ppc_debug_info {
bf23690b SR	374	__u32 version; /* Only version 1 exists to date */
	375	__u32 num_instruction_bps;
	376	__u32 num_data_bps;
	377	__u32 num_condition_regs;
	378	__u32 data_bp_alignment;
	379	__u32 sizeof_condition; /* size of the DVC register */
	380	__u64 features;
3162d92d DK	381	};
	382
	383	#endif /* __ASSEMBLY__ */
	384
	385	/*
	386	* features will have bits indication whether there is support for:
	387	*/
	388	#define PPC_DEBUG_FEATURE_INSN_BP_RANGE 0x0000000000000001
	389	#define PPC_DEBUG_FEATURE_INSN_BP_MASK 0x0000000000000002
	390	#define PPC_DEBUG_FEATURE_DATA_BP_RANGE 0x0000000000000004
	391	#define PPC_DEBUG_FEATURE_DATA_BP_MASK 0x0000000000000008
	392
	393	#ifndef __ASSEMBLY__
	394
	395	struct ppc_hw_breakpoint {
bf23690b SR	396	__u32 version; /* currently, version must be 1 */
	397	__u32 trigger_type; /* only some combinations allowed */
	398	__u32 addr_mode; /* address match mode */
	399	__u32 condition_mode; /* break/watchpoint condition flags */
	400	__u64 addr; /* break/watchpoint address */
	401	__u64 addr2; /* range end or mask */
	402	__u64 condition_value; /* contents of the DVC register */
3162d92d DK	403	};
	404
	405	#endif /* __ASSEMBLY__ */
	406
	407	/*
	408	* Trigger Type
	409	*/
	410	#define PPC_BREAKPOINT_TRIGGER_EXECUTE 0x00000001
	411	#define PPC_BREAKPOINT_TRIGGER_READ 0x00000002
	412	#define PPC_BREAKPOINT_TRIGGER_WRITE 0x00000004
	413	#define PPC_BREAKPOINT_TRIGGER_RW \
	414	(PPC_BREAKPOINT_TRIGGER_READ \| PPC_BREAKPOINT_TRIGGER_WRITE)
	415
	416	/*
	417	* Address Mode
	418	*/
	419	#define PPC_BREAKPOINT_MODE_EXACT 0x00000000
	420	#define PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE 0x00000001
	421	#define PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE 0x00000002
	422	#define PPC_BREAKPOINT_MODE_MASK 0x00000003
	423
	424	/*
	425	* Condition Mode
	426	*/
	427	#define PPC_BREAKPOINT_CONDITION_MODE 0x00000003
	428	#define PPC_BREAKPOINT_CONDITION_NONE 0x00000000
	429	#define PPC_BREAKPOINT_CONDITION_AND 0x00000001
	430	#define PPC_BREAKPOINT_CONDITION_EXACT PPC_BREAKPOINT_CONDITION_AND
	431	#define PPC_BREAKPOINT_CONDITION_OR 0x00000002
	432	#define PPC_BREAKPOINT_CONDITION_AND_OR 0x00000003
	433	#define PPC_BREAKPOINT_CONDITION_BE_ALL 0x00ff0000
	434	#define PPC_BREAKPOINT_CONDITION_BE_SHIFT 16
	435	#define PPC_BREAKPOINT_CONDITION_BE(n) \
	436	(1<<((n)+PPC_BREAKPOINT_CONDITION_BE_SHIFT))
	437
da80d460	438	#endif /* _ASM_POWERPC_PTRACE_H */