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

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 *
 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
 */
#ifndef __ASM_ARC_PTRACE_H
#define __ASM_ARC_PTRACE_H

#include <uapi/asm/ptrace.h>
#include <linux/compiler.h>

#ifndef __ASSEMBLER__

typedef union {
	struct {
#ifdef CONFIG_CPU_BIG_ENDIAN
		unsigned long state:8, vec:8, cause:8, param:8;
#else
		unsigned long param:8, cause:8, vec:8, state:8;
#endif
	};
	unsigned long full;
} ecr_reg;

/* THE pt_regs: Defines how regs are saved during entry into kernel */

#ifdef CONFIG_ISA_ARCOMPACT
struct pt_regs {

	/* Real registers */
	unsigned long bta;	/* bta_l1, bta_l2, erbta */

	unsigned long lp_start, lp_end, lp_count;

	unsigned long status32;	/* status32_l1, status32_l2, erstatus */
	unsigned long ret;	/* ilink1, ilink2 or eret */
	unsigned long blink;
	unsigned long fp;
	unsigned long r26;	/* gp */

	unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;

	unsigned long sp;	/* User/Kernel depending on where we came from */
	unsigned long orig_r0;

	/*
	 * To distinguish bet excp, syscall, irq
	 * For traps and exceptions, Exception Cause Register.
	 * 	ECR: <00> <VV> <CC> <PP>
	 * 	Last word used by Linux for extra state mgmt (syscall-restart)
	 * For interrupts, use artificial ECR values to note current prio-level
	 */
	ecr_reg ecr;
};

struct callee_regs {
	unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
};

#define MAX_REG_OFFSET offsetof(struct pt_regs, ecr)

#else

struct pt_regs {

	unsigned long orig_r0;

	ecr_reg ecr;		/* Exception Cause Reg */

	unsigned long bta;	/* erbta */

	unsigned long fp;
	unsigned long r30;
	unsigned long r12;
	unsigned long r26;	/* gp */

#ifdef CONFIG_ARC_HAS_ACCL_REGS
	unsigned long r58, r59;	/* ACCL/ACCH used by FPU / DSP MPY */
#endif
#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
	unsigned long DSP_CTRL;
#endif

	unsigned long sp;	/* user/kernel sp depending on entry  */

	/*------- Below list auto saved by h/w -----------*/
	unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;

	unsigned long blink;
	unsigned long lp_end, lp_start, lp_count;

	unsigned long ei, ldi, jli;

	unsigned long ret;
	unsigned long status32;
};

struct callee_regs {
	unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
};

#define MAX_REG_OFFSET offsetof(struct pt_regs, status32)

#endif

#define instruction_pointer(regs)	((regs)->ret)
#define profile_pc(regs)		instruction_pointer(regs)

/* return 1 if user mode or 0 if kernel mode */
#define user_mode(regs) (regs->status32 & STATUS_U_MASK)

#define user_stack_pointer(regs)\
({  unsigned int sp;		\
	if (user_mode(regs))	\
		sp = (regs)->sp;\
	else			\
		sp = -1;	\
	sp;			\
})

/* return 1 if PC in delay slot */
#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)

#define in_syscall(regs)    ((regs->ecr.vec == ECR_V_TRAP) && !regs->ecr.param)
#define in_brkpt_trap(regs) ((regs->ecr.vec == ECR_V_TRAP) && regs->ecr.param)

#define STATE_SCALL_RESTARTED	0x01

#define syscall_wont_restart(regs) (regs->ecr.state |= STATE_SCALL_RESTARTED)
#define syscall_restartable(regs) !(regs->ecr.state &  STATE_SCALL_RESTARTED)

#define current_pt_regs()					\
({								\
	/* open-coded current_thread_info() */			\
	register unsigned long sp asm ("sp");			\
	unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));	\
	(struct pt_regs *)(pg_start + THREAD_SIZE) - 1;	\
})

static inline long regs_return_value(struct pt_regs *regs)
{
	return (long)regs->r0;
}

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

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

extern int regs_query_register_offset(const char *name);
extern const char *regs_query_register_name(unsigned int offset);
extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
					       unsigned int n);

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);
}

extern int syscall_trace_enter(struct pt_regs *);
extern void syscall_trace_exit(struct pt_regs *);

#endif /* !__ASSEMBLER__ */

#endif /* __ASM_PTRACE_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0-only */
	2	/*
	3	* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
	4	*
	5	* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
	6	*/
	7	#ifndef __ASM_ARC_PTRACE_H
	8	#define __ASM_ARC_PTRACE_H
	9
	10	#include <uapi/asm/ptrace.h>
	11	#include <linux/compiler.h>
	12
	13	#ifndef __ASSEMBLER__
	14
	15	typedef union {
	16	struct {
	17	#ifdef CONFIG_CPU_BIG_ENDIAN
	18	unsigned long state:8, vec:8, cause:8, param:8;
	19	#else
	20	unsigned long param:8, cause:8, vec:8, state:8;
	21	#endif
	22	};
	23	unsigned long full;
	24	} ecr_reg;
	25
	26	/* THE pt_regs: Defines how regs are saved during entry into kernel */
	27
	28	#ifdef CONFIG_ISA_ARCOMPACT
	29	struct pt_regs {
	30
	31	/* Real registers */
	32	unsigned long bta; /* bta_l1, bta_l2, erbta */
	33
	34	unsigned long lp_start, lp_end, lp_count;
	35
	36	unsigned long status32; /* status32_l1, status32_l2, erstatus */
	37	unsigned long ret; /* ilink1, ilink2 or eret */
	38	unsigned long blink;
	39	unsigned long fp;
	40	unsigned long r26; /* gp */
	41
	42	unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
	43
	44	unsigned long sp; /* User/Kernel depending on where we came from */
	45	unsigned long orig_r0;
	46
	47	/*
	48	* To distinguish bet excp, syscall, irq
	49	* For traps and exceptions, Exception Cause Register.
	50	* ECR: <00> <VV> <CC> <PP>
	51	* Last word used by Linux for extra state mgmt (syscall-restart)
	52	* For interrupts, use artificial ECR values to note current prio-level
	53	*/
	54	ecr_reg ecr;
	55	};
	56
	57	struct callee_regs {
	58	unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
	59	};
	60
	61	#define MAX_REG_OFFSET offsetof(struct pt_regs, ecr)
	62
	63	#else
	64
	65	struct pt_regs {
	66
	67	unsigned long orig_r0;
	68
	69	ecr_reg ecr; /* Exception Cause Reg */
	70
	71	unsigned long bta; /* erbta */
	72
	73	unsigned long fp;
	74	unsigned long r30;
	75	unsigned long r12;
	76	unsigned long r26; /* gp */
	77
	78	#ifdef CONFIG_ARC_HAS_ACCL_REGS
	79	unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
	80	#endif
	81	#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
	82	unsigned long DSP_CTRL;
	83	#endif
	84
	85	unsigned long sp; /* user/kernel sp depending on entry */
	86
	87	/------- Below list auto saved by h/w -----------/
	88	unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
	89
	90	unsigned long blink;
	91	unsigned long lp_end, lp_start, lp_count;
	92
	93	unsigned long ei, ldi, jli;
	94
	95	unsigned long ret;
	96	unsigned long status32;
	97	};
	98
	99	struct callee_regs {
	100	unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
	101	};
	102
	103	#define MAX_REG_OFFSET offsetof(struct pt_regs, status32)
	104
	105	#endif
	106
	107	#define instruction_pointer(regs) ((regs)->ret)
	108	#define profile_pc(regs) instruction_pointer(regs)
	109
	110	/* return 1 if user mode or 0 if kernel mode */
	111	#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
	112
	113	#define user_stack_pointer(regs)\
	114	({ unsigned int sp; \
	115	if (user_mode(regs)) \
	116	sp = (regs)->sp;\
	117	else \
	118	sp = -1; \
	119	sp; \
	120	})
	121
	122	/* return 1 if PC in delay slot */
	123	#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
	124
	125	#define in_syscall(regs) ((regs->ecr.vec == ECR_V_TRAP) && !regs->ecr.param)
	126	#define in_brkpt_trap(regs) ((regs->ecr.vec == ECR_V_TRAP) && regs->ecr.param)
	127
	128	#define STATE_SCALL_RESTARTED 0x01
	129
	130	#define syscall_wont_restart(regs) (regs->ecr.state \|= STATE_SCALL_RESTARTED)
	131	#define syscall_restartable(regs) !(regs->ecr.state & STATE_SCALL_RESTARTED)
	132
	133	#define current_pt_regs() \
	134	({ \
	135	/* open-coded current_thread_info() */ \
	136	register unsigned long sp asm ("sp"); \
	137	unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
	138	(struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
	139	})
	140
	141	static inline long regs_return_value(struct pt_regs *regs)
	142	{
	143	return (long)regs->r0;
	144	}
	145
	146	static inline void instruction_pointer_set(struct pt_regs *regs,
	147	unsigned long val)
	148	{
	149	instruction_pointer(regs) = val;
	150	}
	151
	152	static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
	153	{
	154	return regs->sp;
	155	}
	156
	157	extern int regs_query_register_offset(const char *name);
	158	extern const char *regs_query_register_name(unsigned int offset);
	159	extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
	160	extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
	161	unsigned int n);
	162
	163	static inline unsigned long regs_get_register(struct pt_regs *regs,
	164	unsigned int offset)
	165	{
	166	if (unlikely(offset > MAX_REG_OFFSET))
	167	return 0;
	168
	169	return (unsigned long )((unsigned long)regs + offset);
	170	}
	171
	172	extern int syscall_trace_enter(struct pt_regs *);
	173	extern void syscall_trace_exit(struct pt_regs *);
	174
	175	#endif /* !__ASSEMBLER__ */
	176
	177	#endif /* __ASM_PTRACE_H */