[linux-block.git] / include / asm-xtensa / ptrace.h

/*
 * include/asm-xtensa/ptrace.h
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_PTRACE_H
#define _XTENSA_PTRACE_H

/*
 * Kernel stack
 *
 * 		+-----------------------+  -------- STACK_SIZE
 * 		|     register file     |  |
 * 		+-----------------------+  |
 * 		|    struct pt_regs     |  |
 * 		+-----------------------+  | ------ PT_REGS_OFFSET
 * double 	:  16 bytes spill area  :  |  ^
 * excetion 	:- - - - - - - - - - - -:  |  |
 * frame	:    struct pt_regs     :  |  |
 * 		:- - - - - - - - - - - -:  |  |
 * 		|                       |  |  |
 * 		|     memory stack      |  |  |
 * 		|                       |  |  |
 * 		~                       ~  ~  ~
 * 		~                       ~  ~  ~
 * 		|                       |  |  |
 * 		|                       |  |  |
 * 		+-----------------------+  |  | --- STACK_BIAS
 * 		|  struct task_struct   |  |  |  ^
 *  current --> +-----------------------+  |  |  |
 * 		|  struct thread_info   |  |  |  |
 *		+-----------------------+ --------
 */

#define KERNEL_STACK_SIZE (2 * PAGE_SIZE)

/*  Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */

#define EXC_TABLE_KSTK		0x004	/* Kernel Stack */
#define EXC_TABLE_DOUBLE_SAVE	0x008	/* Double exception save area for a0 */
#define EXC_TABLE_FIXUP		0x00c	/* Fixup handler */
#define EXC_TABLE_PARAM		0x010	/* For passing a parameter to fixup */
#define EXC_TABLE_SYSCALL_SAVE	0x014	/* For fast syscall handler */
#define EXC_TABLE_FAST_USER	0x100	/* Fast user exception handler */
#define EXC_TABLE_FAST_KERNEL	0x200	/* Fast kernel exception handler */
#define EXC_TABLE_DEFAULT	0x300	/* Default C-Handler */
#define EXC_TABLE_SIZE		0x400

/* Registers used by strace */

#define REG_A_BASE	0x0000
#define REG_AR_BASE	0x0100
#define REG_PC		0x0020
#define REG_PS		0x02e6
#define REG_WB		0x0248
#define REG_WS		0x0249
#define REG_LBEG	0x0200
#define REG_LEND	0x0201
#define REG_LCOUNT	0x0202
#define REG_SAR		0x0203

#define SYSCALL_NR	0x00ff

/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */

#define PTRACE_GETREGS		12
#define PTRACE_SETREGS		13
#define PTRACE_GETXTREGS	18
#define PTRACE_SETXTREGS	19

#ifdef __KERNEL__

#ifndef __ASSEMBLY__

/*
 * This struct defines the way the registers are stored on the
 * kernel stack during a system call or other kernel entry.
 */
struct pt_regs {
	unsigned long pc;		/*   4 */
	unsigned long ps;		/*   8 */
	unsigned long depc;		/*  12 */
	unsigned long exccause;		/*  16 */
	unsigned long excvaddr;		/*  20 */
	unsigned long debugcause;	/*  24 */
	unsigned long wmask;		/*  28 */
	unsigned long lbeg;		/*  32 */
	unsigned long lend;		/*  36 */
	unsigned long lcount;		/*  40 */
	unsigned long sar;		/*  44 */
	unsigned long windowbase;	/*  48 */
	unsigned long windowstart;	/*  52 */
	unsigned long syscall;		/*  56 */
	unsigned long icountlevel;	/*  60 */
	int reserved[1];		/*  64 */

	/* Additional configurable registers that are used by the compiler. */
	xtregs_opt_t xtregs_opt;

	/* Make sure the areg field is 16 bytes aligned. */
	int align[0] __attribute__ ((aligned(16)));

	/* current register frame.
	 * Note: The ESF for kernel exceptions ends after 16 registers!
	 */
	unsigned long areg[16];		/* 128 (64) */
};

#include <asm/variant/core.h>

# define task_pt_regs(tsk) ((struct pt_regs*) \
  (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
# define instruction_pointer(regs) ((regs)->pc)
extern void show_regs(struct pt_regs *);

# ifndef CONFIG_SMP
#  define profile_pc(regs) instruction_pointer(regs)
# endif

#else	/* __ASSEMBLY__ */

# include <asm/asm-offsets.h>
#define PT_REGS_OFFSET	  (KERNEL_STACK_SIZE - PT_USER_SIZE)

#endif	/* !__ASSEMBLY__ */

#endif  /* __KERNEL__ */

#endif	/* _XTENSA_PTRACE_H */
Commit	Line	Data
9a8fd558 CZ	1	/*
	2	* include/asm-xtensa/ptrace.h
	3	*
	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file "COPYING" in the main directory of this archive
	6	* for more details.
	7	*
	8	* Copyright (C) 2001 - 2005 Tensilica Inc.
	9	*/
	10
	11	#ifndef _XTENSA_PTRACE_H
	12	#define _XTENSA_PTRACE_H
	13
9a8fd558 CZ	14	/*
	15	* Kernel stack
	16	*
	17	* +-----------------------+ -------- STACK_SIZE
	18	* \| register file \| \|
	19	* +-----------------------+ \|
	20	* \| struct pt_regs \| \|
	21	* +-----------------------+ \| ------ PT_REGS_OFFSET
	22	* double : 16 bytes spill area : \| ^
	23	* excetion :- - - - - - - - - - - -: \| \|
	24	* frame : struct pt_regs : \| \|
	25	* :- - - - - - - - - - - -: \| \|
	26	* \| \| \| \|
	27	* \| memory stack \| \| \|
	28	* \| \| \| \|
	29	* ~ ~ ~ ~
	30	* ~ ~ ~ ~
	31	* \| \| \| \|
	32	* \| \| \| \|
	33	* +-----------------------+ \| \| --- STACK_BIAS
	34	* \| struct task_struct \| \| \| ^
	35	* current --> +-----------------------+ \| \| \|
	36	* \| struct thread_info \| \| \| \|
	37	* +-----------------------+ --------
	38	*/
	39
	40	#define KERNEL_STACK_SIZE (2 * PAGE_SIZE)
	41
	42	/* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */
	43
	44	#define EXC_TABLE_KSTK 0x004 /* Kernel Stack */
	45	#define EXC_TABLE_DOUBLE_SAVE 0x008 /* Double exception save area for a0 */
	46	#define EXC_TABLE_FIXUP 0x00c /* Fixup handler */
	47	#define EXC_TABLE_PARAM 0x010 /* For passing a parameter to fixup */
	48	#define EXC_TABLE_SYSCALL_SAVE 0x014 /* For fast syscall handler */
	49	#define EXC_TABLE_FAST_USER 0x100 /* Fast user exception handler */
	50	#define EXC_TABLE_FAST_KERNEL 0x200 /* Fast kernel exception handler */
	51	#define EXC_TABLE_DEFAULT 0x300 /* Default C-Handler */
	52	#define EXC_TABLE_SIZE 0x400
	53
	54	/* Registers used by strace */
	55
c658eac6 CZ	56	#define REG_A_BASE 0x0000
	57	#define REG_AR_BASE 0x0100
	58	#define REG_PC 0x0020
	59	#define REG_PS 0x02e6
	60	#define REG_WB 0x0248
	61	#define REG_WS 0x0249
	62	#define REG_LBEG 0x0200
	63	#define REG_LEND 0x0201
	64	#define REG_LCOUNT 0x0202
	65	#define REG_SAR 0x0203
	66
	67	#define SYSCALL_NR 0x00ff
9a8fd558 CZ	68
	69	/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
	70
c658eac6 CZ	71	#define PTRACE_GETREGS 12
	72	#define PTRACE_SETREGS 13
	73	#define PTRACE_GETXTREGS 18
	74	#define PTRACE_SETXTREGS 19
9a8fd558	75
c658eac6 CZ	76	#ifdef __KERNEL__
c658eac6 CZ	77
f22ab814 AB	78	#ifndef __ASSEMBLY__
f22ab814 AB	79
9a8fd558 CZ	80	/*
	81	* This struct defines the way the registers are stored on the
	82	* kernel stack during a system call or other kernel entry.
	83	*/
	84	struct pt_regs {
	85	unsigned long pc; /* 4 */
	86	unsigned long ps; /* 8 */
	87	unsigned long depc; /* 12 */
	88	unsigned long exccause; /* 16 */
	89	unsigned long excvaddr; /* 20 */
	90	unsigned long debugcause; /* 24 */
	91	unsigned long wmask; /* 28 */
	92	unsigned long lbeg; /* 32 */
	93	unsigned long lend; /* 36 */
	94	unsigned long lcount; /* 40 */
	95	unsigned long sar; /* 44 */
	96	unsigned long windowbase; /* 48 */
	97	unsigned long windowstart; /* 52 */
	98	unsigned long syscall; /* 56 */
29c4dfd9 CZ	99	unsigned long icountlevel; /* 60 */
29c4dfd9 CZ	100	int reserved[1]; /* 64 */
9a8fd558	101
c658eac6 CZ	102	/* Additional configurable registers that are used by the compiler. */
	103	xtregs_opt_t xtregs_opt;
	104
9a8fd558 CZ	105	/* Make sure the areg field is 16 bytes aligned. */
	106	int align[0] __attribute__ ((aligned(16)));
	107
	108	/* current register frame.
	109	* Note: The ESF for kernel exceptions ends after 16 registers!
	110	*/
	111	unsigned long areg[16]; /* 128 (64) */
	112	};
	113
de4f6e5b CZ	114	#include <asm/variant/core.h>
de4f6e5b CZ	115
04fe6faf AV	116	# define task_pt_regs(tsk) ((struct pt_regs*) \
04fe6faf AV	117	(task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
9a8fd558 CZ	118	# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
	119	# define instruction_pointer(regs) ((regs)->pc)
	120	extern void show_regs(struct pt_regs *);
	121
	122	# ifndef CONFIG_SMP
	123	# define profile_pc(regs) instruction_pointer(regs)
	124	# endif
9a8fd558 CZ	125
	126	#else /* __ASSEMBLY__ */
	127
0013a854	128	# include <asm/asm-offsets.h>
9a8fd558	129	#define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE)
9a8fd558 CZ	130
9a8fd558 CZ	131	#endif /* !__ASSEMBLY__ */
f22ab814 AB	132
	133	#endif /* __KERNEL__ */
	134
9a8fd558	135	#endif /* _XTENSA_PTRACE_H */