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#ifndef _XTENSA_PTRACE_H
11#define _XTENSA_PTRACE_H
12
13#include <asm/kmem_layout.h>
14#include <uapi/asm/ptrace.h>
15
16/*
17 * Kernel stack
18 *
19 *		+-----------------------+  -------- STACK_SIZE
20 *		|     register file     |  |
21 *		+-----------------------+  |
22 *		|    struct pt_regs     |  |
23 *		+-----------------------+  | ------ PT_REGS_OFFSET
24 * double	:  16 bytes spill area  :  |  ^
25 * excetion	:- - - - - - - - - - - -:  |  |
26 * frame	:    struct pt_regs     :  |  |
27 *		:- - - - - - - - - - - -:  |  |
28 *		|                       |  |  |
29 *		|     memory stack      |  |  |
30 *		|                       |  |  |
31 *		~                       ~  ~  ~
32 *		~                       ~  ~  ~
33 *		|                       |  |  |
34 *		|                       |  |  |
35 *		+-----------------------+  |  | --- STACK_BIAS
36 *		|  struct task_struct   |  |  |  ^
37 *  current --> +-----------------------+  |  |  |
38 *		|  struct thread_info   |  |  |  |
39 *		+-----------------------+ --------
40 */
41
42#define NO_SYSCALL (-1)
43
44#ifndef __ASSEMBLY__
45
46#include <asm/coprocessor.h>
47
48/*
49 * This struct defines the way the registers are stored on the
50 * kernel stack during a system call or other kernel entry.
51 */
52struct pt_regs {
53	unsigned long pc;		/*   4 */
54	unsigned long ps;		/*   8 */
55	unsigned long depc;		/*  12 */
56	unsigned long exccause;		/*  16 */
57	unsigned long excvaddr;		/*  20 */
58	unsigned long debugcause;	/*  24 */
59	unsigned long wmask;		/*  28 */
60	unsigned long lbeg;		/*  32 */
61	unsigned long lend;		/*  36 */
62	unsigned long lcount;		/*  40 */
63	unsigned long sar;		/*  44 */
64	unsigned long windowbase;	/*  48 */
65	unsigned long windowstart;	/*  52 */
66	unsigned long syscall;		/*  56 */
67	unsigned long icountlevel;	/*  60 */
68	unsigned long scompare1;	/*  64 */
69	unsigned long threadptr;	/*  68 */
70
71	/* Additional configurable registers that are used by the compiler. */
72	xtregs_opt_t xtregs_opt;
73
74	/* Make sure the areg field is 16 bytes aligned. */
75	int align[0] __attribute__ ((aligned(16)));
76
77	/* current register frame.
78	 * Note: The ESF for kernel exceptions ends after 16 registers!
79	 */
80	unsigned long areg[16];
81};
82
83#include <asm/core.h>
84
85# define arch_has_single_step()	(1)
86# define task_pt_regs(tsk) ((struct pt_regs*) \
87	(task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
88# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
89# define instruction_pointer(regs) ((regs)->pc)
90# define return_pointer(regs) (MAKE_PC_FROM_RA((regs)->areg[0], \
91					       (regs)->areg[1]))
92
93# ifndef CONFIG_SMP
94#  define profile_pc(regs) instruction_pointer(regs)
95# else
96#  define profile_pc(regs)						\
97	({								\
98		in_lock_functions(instruction_pointer(regs)) ?		\
99		return_pointer(regs) : instruction_pointer(regs);	\
100	})
101# endif
102
103#define user_stack_pointer(regs) ((regs)->areg[1])
104
105static inline unsigned long regs_return_value(struct pt_regs *regs)
106{
107	return regs->areg[2];
108}
109
110#else	/* __ASSEMBLY__ */
111
112# include <asm/asm-offsets.h>
113#define PT_REGS_OFFSET	  (KERNEL_STACK_SIZE - PT_USER_SIZE)
114
115#endif	/* !__ASSEMBLY__ */
116
117#endif	/* _XTENSA_PTRACE_H */
118