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

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * 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.
 */
#ifndef _ASM_POWERPC_PTRACE_H
#define _ASM_POWERPC_PTRACE_H

#include <linux/err.h>
#include <uapi/asm/ptrace.h>
#include <asm/asm-const.h>
#include <asm/reg.h>

#ifndef __ASSEMBLY__
struct pt_regs
{
	union {
		struct user_pt_regs user_regs;
		struct {
			unsigned long gpr[32];
			unsigned long nip;
			unsigned long msr;
			unsigned long orig_gpr3;
			unsigned long ctr;
			unsigned long link;
			unsigned long xer;
			unsigned long ccr;
#ifdef CONFIG_PPC64
			unsigned long softe;
#else
			unsigned long mq;
#endif
			unsigned long trap;
			union {
				unsigned long dar;
				unsigned long dear;
			};
			union {
				unsigned long dsisr;
				unsigned long esr;
			};
			unsigned long result;
		};
	};
#if defined(CONFIG_PPC64) || defined(CONFIG_PPC_KUAP)
	union {
		struct {
#ifdef CONFIG_PPC64
			unsigned long ppr;
			unsigned long exit_result;
#endif
			union {
#ifdef CONFIG_PPC_KUAP
				unsigned long kuap;
#endif
#ifdef CONFIG_PPC_PKEY
				unsigned long amr;
#endif
			};
#ifdef CONFIG_PPC_PKEY
			unsigned long iamr;
#endif
		};
		unsigned long __pad[4];	/* Maintain 16 byte interrupt stack alignment */
	};
#endif
#if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
	struct { /* Must be a multiple of 16 bytes */
		unsigned long mas0;
		unsigned long mas1;
		unsigned long mas2;
		unsigned long mas3;
		unsigned long mas6;
		unsigned long mas7;
		unsigned long srr0;
		unsigned long srr1;
		unsigned long csrr0;
		unsigned long csrr1;
		unsigned long dsrr0;
		unsigned long dsrr1;
	};
#endif
};
#endif


#define STACK_FRAME_WITH_PT_REGS (STACK_FRAME_OVERHEAD + sizeof(struct pt_regs))

// Always displays as "REGS" in memory dumps
#ifdef CONFIG_CPU_BIG_ENDIAN
#define STACK_FRAME_REGS_MARKER	ASM_CONST(0x52454753)
#else
#define STACK_FRAME_REGS_MARKER	ASM_CONST(0x53474552)
#endif

#ifdef __powerpc64__

/*
 * Size of redzone that userspace is allowed to use below the stack
 * pointer.  This is 288 in the 64-bit big-endian ELF ABI, and 512 in
 * the new ELFv2 little-endian ABI, so we allow the larger amount.
 *
 * For kernel code we allow a 288-byte redzone, in order to conserve
 * kernel stack space; gcc currently only uses 288 bytes, and will
 * hopefully allow explicit control of the redzone size in future.
 */
#define USER_REDZONE_SIZE	512
#define KERNEL_REDZONE_SIZE	288

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

#ifdef CONFIG_PPC64_ELF_ABI_V2
#define STACK_FRAME_MIN_SIZE	32
#else
#define STACK_FRAME_MIN_SIZE	STACK_FRAME_OVERHEAD
#endif

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

#else /* __powerpc64__ */

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

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

#endif /* __powerpc64__ */

#ifndef __ASSEMBLY__
#include <asm/paca.h>

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

long do_syscall_trace_enter(struct pt_regs *regs);
void do_syscall_trace_leave(struct pt_regs *regs);

static inline void set_return_regs_changed(void)
{
#ifdef CONFIG_PPC_BOOK3S_64
	local_paca->hsrr_valid = 0;
	local_paca->srr_valid = 0;
#endif
}

static inline void regs_set_return_ip(struct pt_regs *regs, unsigned long ip)
{
	regs->nip = ip;
	set_return_regs_changed();
}

static inline void regs_set_return_msr(struct pt_regs *regs, unsigned long msr)
{
	regs->msr = msr;
	set_return_regs_changed();
}

static inline void regs_add_return_ip(struct pt_regs *regs, long offset)
{
	regs_set_return_ip(regs, regs->nip + offset);
}

static inline unsigned long instruction_pointer(struct pt_regs *regs)
{
	return regs->nip;
}

static inline void instruction_pointer_set(struct pt_regs *regs,
		unsigned long val)
{
	regs_set_return_ip(regs, val);
}

static inline unsigned long user_stack_pointer(struct pt_regs *regs)
{
	return regs->gpr[1];
}

static inline unsigned long frame_pointer(struct pt_regs *regs)
{
	return 0;
}

#define user_mode(regs) (((regs)->msr & MSR_PR) != 0)

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

#define current_pt_regs() \
	((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)

/*
 * The 4 low bits (0xf) are available as flags to overload the trap word,
 * because interrupt vectors have minimum alignment of 0x10. TRAP_FLAGS_MASK
 * must cover the bits used as flags, including bit 0 which is used as the
 * "norestart" bit.
 */
#ifdef __powerpc64__
#define TRAP_FLAGS_MASK		0x1
#else
/*
 * On 4xx we use bit 1 in the trap word to indicate whether the exception
 * is a critical exception (1 means it is).
 */
#define TRAP_FLAGS_MASK		0xf
#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 & ~TRAP_FLAGS_MASK)

static __always_inline void set_trap(struct pt_regs *regs, unsigned long val)
{
	regs->trap = (regs->trap & TRAP_FLAGS_MASK) | (val & ~TRAP_FLAGS_MASK);
}

static inline bool trap_is_scv(struct pt_regs *regs)
{
	return (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x3000);
}

static inline bool trap_is_unsupported_scv(struct pt_regs *regs)
{
	return IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x7ff0;
}

static inline bool trap_is_syscall(struct pt_regs *regs)
{
	return (trap_is_scv(regs) || TRAP(regs) == 0xc00);
}

static inline bool trap_norestart(struct pt_regs *regs)
{
	return regs->trap & 0x1;
}

static __always_inline void set_trap_norestart(struct pt_regs *regs)
{
	regs->trap |= 0x1;
}

#define kernel_stack_pointer(regs) ((regs)->gpr[1])
static inline int is_syscall_success(struct pt_regs *regs)
{
	if (trap_is_scv(regs))
		return !IS_ERR_VALUE((unsigned long)regs->gpr[3]);
	else
		return !(regs->ccr & 0x10000000);
}

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

	if (is_syscall_success(regs))
		return regs->gpr[3];
	else
		return -regs->gpr[3];
}

static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
{
	regs->gpr[3] = rc;
}

static inline bool cpu_has_msr_ri(void)
{
	return !IS_ENABLED(CONFIG_BOOKE_OR_40x);
}

static inline bool regs_is_unrecoverable(struct pt_regs *regs)
{
	return unlikely(cpu_has_msr_ri() && !(regs->msr & MSR_RI));
}

static inline void regs_set_recoverable(struct pt_regs *regs)
{
	if (cpu_has_msr_ri())
		regs_set_return_msr(regs, regs->msr | MSR_RI);
}

static inline void regs_set_unrecoverable(struct pt_regs *regs)
{
	if (cpu_has_msr_ri())
		regs_set_return_msr(regs, regs->msr & ~MSR_RI);
}

#define arch_has_single_step()	(1)
#define arch_has_block_step()	(true)
#define ARCH_HAS_USER_SINGLE_STEP_REPORT

/*
 * 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__ */

#ifndef __powerpc64__
/* We need PT_SOFTE defined at all time to avoid #ifdefs */
#define PT_SOFTE PT_MQ
#else /* __powerpc64__ */
#define PT_FPSCR32 (PT_FPR0 + 2*32 + 1)	/* each FP reg occupies 2 32-bit userspace slots */
#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)
#define PT_VSR0_32 300 	/* each VSR reg occupies 4 slots in 32-bit */
#endif /* __powerpc64__ */
#endif /* _ASM_POWERPC_PTRACE_H */
Commit	Line	Data
2874c5fd	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
1da177e4 LT	2	/*
	3	* Copyright (C) 2001 PPC64 Team, IBM Corp
	4	*
	5	* This struct defines the way the registers are stored on the
	6	* kernel stack during a system call or other kernel entry.
	7	*
	8	* this should only contain volatile regs
	9	* since we can keep non-volatile in the thread_struct
	10	* should set this up when only volatiles are saved
	11	* by intr code.
	12	*
	13	* Since this is going on the stack, CARE MUST BE TAKEN to insure
	14	* that the overall structure is a multiple of 16 bytes in length.
	15	*
	16	* Note that the offsets of the fields in this struct correspond with
da80d460	17	* the PT_* values below. This simplifies arch/powerpc/kernel/ptrace.c.
1da177e4	18	*/
c3617f72 DH	19	#ifndef _ASM_POWERPC_PTRACE_H
c3617f72 DH	20	#define _ASM_POWERPC_PTRACE_H
1da177e4	21
d72500f9	22	#include <linux/err.h>
c3617f72	23	#include <uapi/asm/ptrace.h>
ec0c464c	24	#include <asm/asm-const.h>
806c0e6e	25	#include <asm/reg.h>
1da177e4	26
002af939 ME	27	#ifndef __ASSEMBLY__
	28	struct pt_regs
	29	{
	30	union {
	31	struct user_pt_regs user_regs;
	32	struct {
	33	unsigned long gpr[32];
	34	unsigned long nip;
	35	unsigned long msr;
	36	unsigned long orig_gpr3;
	37	unsigned long ctr;
	38	unsigned long link;
	39	unsigned long xer;
	40	unsigned long ccr;
	41	#ifdef CONFIG_PPC64
	42	unsigned long softe;
	43	#else
	44	unsigned long mq;
	45	#endif
	46	unsigned long trap;
4872cbd0 XS	47	union {
	48	unsigned long dar;
	49	unsigned long dear;
	50	};
4f8e78c0 XS	51	union {
	52	unsigned long dsisr;
	53	unsigned long esr;
	54	};
002af939 ME	55	unsigned long result;
	56	};
	57	};
b09049c5	58	#if defined(CONFIG_PPC64) \|\| defined(CONFIG_PPC_KUAP)
de78a9c4 CL	59	union {
de78a9c4 CL	60	struct {
4c2de74c	61	#ifdef CONFIG_PPC64
de78a9c4	62	unsigned long ppr;
13799748	63	unsigned long exit_result;
de78a9c4	64	#endif
227ae625	65	union {
de78a9c4	66	#ifdef CONFIG_PPC_KUAP
227ae625	67	unsigned long kuap;
4c2de74c	68	#endif
227ae625 AK	69	#ifdef CONFIG_PPC_PKEY
	70	unsigned long amr;
	71	#endif
	72	};
8e560921 AK	73	#ifdef CONFIG_PPC_PKEY
	74	unsigned long iamr;
	75	#endif
de78a9c4	76	};
8e560921	77	unsigned long __pad[4]; /* Maintain 16 byte interrupt stack alignment */
de78a9c4	78	};
b09049c5	79	#endif
b5cfc9cd CL	80	#if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
	81	struct { /* Must be a multiple of 16 bytes */
	82	unsigned long mas0;
	83	unsigned long mas1;
	84	unsigned long mas2;
	85	unsigned long mas3;
	86	unsigned long mas6;
	87	unsigned long mas7;
	88	unsigned long srr0;
	89	unsigned long srr1;
	90	unsigned long csrr0;
	91	unsigned long csrr1;
	92	unsigned long dsrr0;
	93	unsigned long dsrr1;
	94	};
	95	#endif
002af939 ME	96	};
002af939 ME	97	#endif
a0987224	98
e3de1e29 ME	99
	100	#define STACK_FRAME_WITH_PT_REGS (STACK_FRAME_OVERHEAD + sizeof(struct pt_regs))
	101
19c95df1 ME	102	// Always displays as "REGS" in memory dumps
19c95df1 ME	103	#ifdef CONFIG_CPU_BIG_ENDIAN
bbd71709	104	#define STACK_FRAME_REGS_MARKER ASM_CONST(0x52454753)
19c95df1 ME	105	#else
	106	#define STACK_FRAME_REGS_MARKER ASM_CONST(0x53474552)
	107	#endif
17773afd	108
da80d460 SR	109	#ifdef __powerpc64__
da80d460 SR	110
573ebfa6 PM	111	/*
	112	* Size of redzone that userspace is allowed to use below the stack
	113	* pointer. This is 288 in the 64-bit big-endian ELF ABI, and 512 in
	114	* the new ELFv2 little-endian ABI, so we allow the larger amount.
	115	*
	116	* For kernel code we allow a 288-byte redzone, in order to conserve
	117	* kernel stack space; gcc currently only uses 288 bytes, and will
	118	* hopefully allow explicit control of the redzone size in future.
	119	*/
	120	#define USER_REDZONE_SIZE 512
	121	#define KERNEL_REDZONE_SIZE 288
	122
da80d460	123	#define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */
ec2b36b9	124	#define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */
ec2b36b9	125	#define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + \
573ebfa6	126	STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
ec2b36b9	127	#define STACK_FRAME_MARKER 12
da80d460	128
7d40aff8	129	#ifdef CONFIG_PPC64_ELF_ABI_V2
85101af1 AB	130	#define STACK_FRAME_MIN_SIZE 32
	131	#else
	132	#define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
	133	#endif
	134
da80d460 SR	135	/* Size of dummy stack frame allocated when calling signal handler. */
	136	#define __SIGNAL_FRAMESIZE 128
	137	#define __SIGNAL_FRAMESIZE32 64
	138
	139	#else /* __powerpc64__ */
	140
573ebfa6 PM	141	#define USER_REDZONE_SIZE 0
573ebfa6 PM	142	#define KERNEL_REDZONE_SIZE 0
da80d460	143	#define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */
ec2b36b9	144	#define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */
ec2b36b9 BH	145	#define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
ec2b36b9 BH	146	#define STACK_FRAME_MARKER 2
85101af1	147	#define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
da80d460 SR	148
	149	/* Size of stack frame allocated when calling signal handler. */
	150	#define __SIGNAL_FRAMESIZE 64
	151
	152	#endif /* __powerpc64__ */
a0987224	153
da80d460	154	#ifndef __ASSEMBLY__
59dc5bfc NP	155	#include <asm/paca.h>
	156
	157	#ifdef CONFIG_SMP
	158	extern unsigned long profile_pc(struct pt_regs *regs);
	159	#else
	160	#define profile_pc(regs) instruction_pointer(regs)
	161	#endif
	162
	163	long do_syscall_trace_enter(struct pt_regs *regs);
	164	void do_syscall_trace_leave(struct pt_regs *regs);
	165
5f0f95f1	166	static inline void set_return_regs_changed(void)
59dc5bfc	167	{
59dc5bfc NP	168	#ifdef CONFIG_PPC_BOOK3S_64
	169	local_paca->hsrr_valid = 0;
	170	local_paca->srr_valid = 0;
	171	#endif
	172	}
	173
5f0f95f1	174	static inline void regs_set_return_ip(struct pt_regs *regs, unsigned long ip)
59dc5bfc	175	{
5f0f95f1	176	regs->nip = ip;
cae46446	177	set_return_regs_changed();
59dc5bfc NP	178	}
59dc5bfc NP	179
5f0f95f1	180	static inline void regs_set_return_msr(struct pt_regs *regs, unsigned long msr)
59dc5bfc	181	{
5f0f95f1	182	regs->msr = msr;
cae46446	183	set_return_regs_changed();
59dc5bfc NP	184	}
	185
	186	static inline void regs_add_return_ip(struct pt_regs *regs, long offset)
	187	{
	188	regs_set_return_ip(regs, regs->nip + offset);
	189	}
da80d460	190
b42dfdea CH	191	static inline unsigned long instruction_pointer(struct pt_regs *regs)
	192	{
	193	return regs->nip;
	194	}
	195
	196	static inline void instruction_pointer_set(struct pt_regs *regs,
	197	unsigned long val)
	198	{
59dc5bfc	199	regs_set_return_ip(regs, val);
b42dfdea CH	200	}
	201
	202	static inline unsigned long user_stack_pointer(struct pt_regs *regs)
	203	{
	204	return regs->gpr[1];
	205	}
	206
	207	static inline unsigned long frame_pointer(struct pt_regs *regs)
	208	{
	209	return 0;
	210	}
e6289427	211
da80d460	212	#define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
1da177e4 LT	213
1da177e4 LT	214	#define force_successful_syscall_return() \
da80d460	215	do { \
401d1f02	216	set_thread_flag(TIF_NOERROR); \
da80d460	217	} while(0)
1da177e4	218
be6abfa7	219	#define current_pt_regs() \
b72cc2e7	220	((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)
feb9df34	221
8f6cc75a NP	222	/*
	223	* The 4 low bits (0xf) are available as flags to overload the trap word,
	224	* because interrupt vectors have minimum alignment of 0x10. TRAP_FLAGS_MASK
	225	* must cover the bits used as flags, including bit 0 which is used as the
	226	* "norestart" bit.
	227	*/
feb9df34	228	#ifdef __powerpc64__
8f6cc75a	229	#define TRAP_FLAGS_MASK 0x1
feb9df34	230	#else
1da177e4	231	/*
8dc7f022	232	* On 4xx we use bit 1 in the trap word to indicate whether the exception
da80d460	233	* is a critical exception (1 means it is).
1da177e4	234	*/
8f6cc75a	235	#define TRAP_FLAGS_MASK 0xf
47c0bd1a BH	236	#define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0)
47c0bd1a BH	237	#define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0)
663276b7	238	#define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)
da80d460	239	#endif /* __powerpc64__ */
8f6cc75a	240	#define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK)
a0987224	241
93c043e3	242	static __always_inline void set_trap(struct pt_regs *regs, unsigned long val)
db30144b NP	243	{
	244	regs->trap = (regs->trap & TRAP_FLAGS_MASK) \| (val & ~TRAP_FLAGS_MASK);
	245	}
	246
7fa95f9a NP	247	static inline bool trap_is_scv(struct pt_regs *regs)
	248	{
	249	return (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x3000);
	250	}
	251
b966f227 CL	252	static inline bool trap_is_unsupported_scv(struct pt_regs *regs)
	253	{
	254	return IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x7ff0;
	255	}
	256
912237ea NP	257	static inline bool trap_is_syscall(struct pt_regs *regs)
912237ea NP	258	{
7fa95f9a	259	return (trap_is_scv(regs) \|\| TRAP(regs) == 0xc00);
912237ea NP	260	}
912237ea NP	261
4e0e45b0 NP	262	static inline bool trap_norestart(struct pt_regs *regs)
4e0e45b0 NP	263	{
8f6cc75a	264	return regs->trap & 0x1;
4e0e45b0 NP	265	}
4e0e45b0 NP	266
627b72be	267	static __always_inline void set_trap_norestart(struct pt_regs *regs)
4e0e45b0	268	{
8f6cc75a	269	regs->trap \|= 0x1;
4e0e45b0 NP	270	}
4e0e45b0 NP	271
d72500f9 NP	272	#define kernel_stack_pointer(regs) ((regs)->gpr[1])
	273	static inline int is_syscall_success(struct pt_regs *regs)
	274	{
	275	if (trap_is_scv(regs))
	276	return !IS_ERR_VALUE((unsigned long)regs->gpr[3]);
	277	else
	278	return !(regs->ccr & 0x10000000);
	279	}
	280
	281	static inline long regs_return_value(struct pt_regs *regs)
	282	{
	283	if (trap_is_scv(regs))
	284	return regs->gpr[3];
	285
	286	if (is_syscall_success(regs))
	287	return regs->gpr[3];
	288	else
	289	return -regs->gpr[3];
	290	}
	291
	292	static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
	293	{
	294	regs->gpr[3] = rc;
	295	}
	296
806c0e6e CL	297	static inline bool cpu_has_msr_ri(void)
806c0e6e CL	298	{
047a6fd4	299	return !IS_ENABLED(CONFIG_BOOKE_OR_40x);
806c0e6e CL	300	}
	301
	302	static inline bool regs_is_unrecoverable(struct pt_regs *regs)
	303	{
	304	return unlikely(cpu_has_msr_ri() && !(regs->msr & MSR_RI));
	305	}
	306
	307	static inline void regs_set_recoverable(struct pt_regs *regs)
	308	{
	309	if (cpu_has_msr_ri())
	310	regs_set_return_msr(regs, regs->msr \| MSR_RI);
	311	}
	312
	313	static inline void regs_set_unrecoverable(struct pt_regs *regs)
	314	{
	315	if (cpu_has_msr_ri())
	316	regs_set_return_msr(regs, regs->msr & ~MSR_RI);
	317	}
	318
2a84b0d7	319	#define arch_has_single_step() (1)
12c3f1fd	320	#define arch_has_block_step() (true)
efc463ad	321	#define ARCH_HAS_USER_SINGLE_STEP_REPORT
25baa35b	322
359e4284 MS	323	/*
	324	* kprobe-based event tracer support
	325	*/
	326
	327	#include <linux/stddef.h>
	328	#include <linux/thread_info.h>
	329	extern int regs_query_register_offset(const char *name);
	330	extern const char *regs_query_register_name(unsigned int offset);
	331	#define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))
	332
	333	/**
	334	* regs_get_register() - get register value from its offset
	335	* @regs: pt_regs from which register value is gotten
	336	* @offset: offset number of the register.
	337	*
	338	* regs_get_register returns the value of a register whose offset from @regs.
	339	* The @offset is the offset of the register in struct pt_regs.
	340	* If @offset is bigger than MAX_REG_OFFSET, this returns 0.
	341	*/
	342	static inline unsigned long regs_get_register(struct pt_regs *regs,
	343	unsigned int offset)
	344	{
	345	if (unlikely(offset > MAX_REG_OFFSET))
	346	return 0;
	347	return (unsigned long )((unsigned long)regs + offset);
	348	}
	349
	350	/**
	351	* regs_within_kernel_stack() - check the address in the stack
	352	* @regs: pt_regs which contains kernel stack pointer.
	353	* @addr: address which is checked.
	354	*
	355	* regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
	356	* If @addr is within the kernel stack, it returns true. If not, returns false.
	357	*/
	358
	359	static inline bool regs_within_kernel_stack(struct pt_regs *regs,
	360	unsigned long addr)
	361	{
	362	return ((addr & ~(THREAD_SIZE - 1)) ==
	363	(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
	364	}
	365
	366	/**
	367	* regs_get_kernel_stack_nth() - get Nth entry of the stack
	368	* @regs: pt_regs which contains kernel stack pointer.
	369	* @n: stack entry number.
	370	*
	371	* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
	372	* is specified by @regs. If the @n th entry is NOT in the kernel stack,
	373	* this returns 0.
	374	*/
	375	static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
	376	unsigned int n)
	377	{
	378	unsigned long addr = (unsigned long )kernel_stack_pointer(regs);
	379	addr += n;
	380	if (regs_within_kernel_stack(regs, (unsigned long)addr))
	381	return *addr;
	382	else
	383	return 0;
	384	}
	385
a0987224 AB	386	#endif /* __ASSEMBLY__ */
a0987224 AB	387
da80d460	388	#ifndef __powerpc64__
f1763e62 CL	389	/* We need PT_SOFTE defined at all time to avoid #ifdefs */
f1763e62 CL	390	#define PT_SOFTE PT_MQ
da80d460	391	#else /* __powerpc64__ */
a0987224	392	#define PT_FPSCR32 (PT_FPR0 + 232 + 1) / each FP reg occupies 2 32-bit userspace slots */
1da177e4 LT	393	#define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */
	394	#define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
	395	#define PT_VRSAVE_32 (PT_VR0 + 33*4)
ce48b210	396	#define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */
da80d460	397	#endif /* __powerpc64__ */
da80d460	398	#endif /* _ASM_POWERPC_PTRACE_H */