[deliverable/linux.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	0xfc000000
#define REG_AR_BASE	0x04000000
#define REG_PC		0x14000000
#define REG_PS		0x080000e6
#define REG_WB		0x08000048
#define REG_WS		0x08000049
#define REG_LBEG	0x08000000
#define REG_LEND	0x08000001
#define REG_LCOUNT	0x08000002
#define REG_SAR		0x08000003
#define REG_DEPC	0x080000c0
#define	REG_EXCCAUSE	0x080000e8
#define REG_EXCVADDR	0x080000ee
#define SYSCALL_NR	0x1

#define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1)

/* 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_GETFPREGS          14
#define PTRACE_SETFPREGS          15
#define PTRACE_GETFPREGSIZE       18

#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 */

	/* 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) */
};

#ifdef __KERNEL__

#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
#endif /* __KERNEL__ */

#else	/* __ASSEMBLY__ */

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

#endif	/* !__ASSEMBLY__ */
#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
	56	#define REG_A_BASE 0xfc000000
	57	#define REG_AR_BASE 0x04000000
	58	#define REG_PC 0x14000000
	59	#define REG_PS 0x080000e6
	60	#define REG_WB 0x08000048
	61	#define REG_WS 0x08000049
	62	#define REG_LBEG 0x08000000
	63	#define REG_LEND 0x08000001
	64	#define REG_LCOUNT 0x08000002
	65	#define REG_SAR 0x08000003
	66	#define REG_DEPC 0x080000c0
	67	#define REG_EXCCAUSE 0x080000e8
	68	#define REG_EXCVADDR 0x080000ee
	69	#define SYSCALL_NR 0x1
	70
	71	#define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1)
	72
	73	/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
	74
	75	#define PTRACE_GETREGS 12
	76	#define PTRACE_SETREGS 13
	77	#define PTRACE_GETFPREGS 14
78	#define PTRACE_SETFPREGS 15
79	#define PTRACE_GETFPREGSIZE 18
80
81	#ifndef __ASSEMBLY__
82
83	/*
84	* This struct defines the way the registers are stored on the
85	* kernel stack during a system call or other kernel entry.
86	*/
87	struct pt_regs {
88	unsigned long pc; /* 4 */
89	unsigned long ps; /* 8 */
90	unsigned long depc; /* 12 */
91	unsigned long exccause; /* 16 */
92	unsigned long excvaddr; /* 20 */
93	unsigned long debugcause; /* 24 */
94	unsigned long wmask; /* 28 */
95	unsigned long lbeg; /* 32 */
96	unsigned long lend; /* 36 */
97	unsigned long lcount; /* 40 */
98	unsigned long sar; /* 44 */
99	unsigned long windowbase; /* 48 */
100	unsigned long windowstart; /* 52 */
101	unsigned long syscall; /* 56 */
29c4dfd9 CZ	102	unsigned long icountlevel; /* 60 */
29c4dfd9 CZ	103	int reserved[1]; /* 64 */
9a8fd558 CZ	104
	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
	114	#ifdef __KERNEL__
de4f6e5b CZ	115
	116	#include <asm/variant/core.h>
	117
04fe6faf AV	118	# define task_pt_regs(tsk) ((struct pt_regs*) \
04fe6faf AV	119	(task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
9a8fd558 CZ	120	# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
	121	# define instruction_pointer(regs) ((regs)->pc)
	122	extern void show_regs(struct pt_regs *);
	123
	124	# ifndef CONFIG_SMP
	125	# define profile_pc(regs) instruction_pointer(regs)
	126	# endif
	127	#endif /* __KERNEL__ */
	128
	129	#else /* __ASSEMBLY__ */
	130
	131	#ifdef __KERNEL__
0013a854	132	# include <asm/asm-offsets.h>
9a8fd558 CZ	133	#define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE)
	134	#endif
	135
	136	#endif /* !__ASSEMBLY__ */
	137	#endif /* _XTENSA_PTRACE_H */