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/arch/xtensa/include/asm/ptrace.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C++ Header | 136 lines | 66 code | 24 blank | 46 comment | 0 complexity | 9a400714e0fcac17e2d8440a0da8b13a MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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
 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	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
 68
 69/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
 70
 71#define PTRACE_GETREGS		12
 72#define PTRACE_SETREGS		13
 73#define PTRACE_GETXTREGS	18
 74#define PTRACE_SETXTREGS	19
 75
 76#ifdef __KERNEL__
 77
 78#ifndef __ASSEMBLY__
 79
 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 */
 84struct 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 */
 99	unsigned long icountlevel;	/*  60 */
100	int reserved[1];		/*  64 */
101
102	/* Additional configurable registers that are used by the compiler. */
103	xtregs_opt_t xtregs_opt;
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#include <variant/core.h>
115
116# define arch_has_single_step()	(1)
117# define task_pt_regs(tsk) ((struct pt_regs*) \
118  (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
119# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
120# define instruction_pointer(regs) ((regs)->pc)
121extern void show_regs(struct pt_regs *);
122
123# ifndef CONFIG_SMP
124#  define profile_pc(regs) instruction_pointer(regs)
125# endif
126
127#else	/* __ASSEMBLY__ */
128
129# include <asm/asm-offsets.h>
130#define PT_REGS_OFFSET	  (KERNEL_STACK_SIZE - PT_USER_SIZE)
131
132#endif	/* !__ASSEMBLY__ */
133
134#endif  /* __KERNEL__ */
135
136#endif	/* _XTENSA_PTRACE_H */