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.
 */

#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 instruction_pointer(regs) ((regs)->nip)
#define user_stack_pointer(regs) ((regs)->gpr[1])
#define regs_return_value(regs) ((regs)->gpr[3])

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

#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 CHECK_FULL_REGS(regs)	BUG_ON(regs->trap & 1)
#else
#define CHECK_FULL_REGS(regs)						      \
do {									      \
	if ((regs)->trap & 1)						      \
		printk(KERN_CRIT "%s: partial register set\n", __func__); \
} while (0)
#endif /* __powerpc64__ */

/*
 * These are defined as per linux/ptrace.h, which see.
 */
#define arch_has_single_step()	(1)
#define arch_has_block_step()	(!cpu_has_feature(CPU_FTR_601))
extern void user_enable_single_step(struct task_struct *);
extern void user_enable_block_step(struct task_struct *);
extern void user_disable_single_step(struct task_struct *);

#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

/* (old) PTRACE requests with inverted arguments */
#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

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

#endif /* _ASM_POWERPC_PTRACE_H */