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#include <asm/core.h>
48
49/*
50 * This struct defines the way the registers are stored on the
51 * kernel stack during a system call or other kernel entry.
52 */
53struct pt_regs {
54	unsigned long pc;		/*   4 */
55	unsigned long ps;		/*   8 */
56	unsigned long depc;		/*  12 */
57	unsigned long exccause;		/*  16 */
58	unsigned long excvaddr;		/*  20 */
59	unsigned long debugcause;	/*  24 */
60	unsigned long wmask;		/*  28 */
61	unsigned long lbeg;		/*  32 */
62	unsigned long lend;		/*  36 */
63	unsigned long lcount;		/*  40 */
64	unsigned long sar;		/*  44 */
65	unsigned long windowbase;	/*  48 */
66	unsigned long windowstart;	/*  52 */
67	unsigned long syscall;		/*  56 */
68	unsigned long icountlevel;	/*  60 */
69	unsigned long scompare1;	/*  64 */
70	unsigned long threadptr;	/*  68 */
71
72	/* Additional configurable registers that are used by the compiler. */
73	xtregs_opt_t xtregs_opt;
74
75	/* Make sure the areg field is 16 bytes aligned. */
76	int align[0] __attribute__ ((aligned(16)));
77
78	/* current register frame.
79	 * Note: The ESF for kernel exceptions ends after 16 registers!
80	 */
81	unsigned long areg[XCHAL_NUM_AREGS];
82};
83
84# define arch_has_single_step()	(1)
85# define task_pt_regs(tsk) ((struct pt_regs*) \
86	(task_stack_page(tsk) + KERNEL_STACK_SIZE) - 1)
87# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
88# define instruction_pointer(regs) ((regs)->pc)
89# define return_pointer(regs) (MAKE_PC_FROM_RA((regs)->areg[0], \
90					       (regs)->areg[1]))
91
92# ifndef CONFIG_SMP
93#  define profile_pc(regs) instruction_pointer(regs)
94# else
95#  define profile_pc(regs)						\
96	({								\
97		in_lock_functions(instruction_pointer(regs)) ?		\
98		return_pointer(regs) : instruction_pointer(regs);	\
99	})
100# endif
101
102#define user_stack_pointer(regs) ((regs)->areg[1])
103
104static inline unsigned long regs_return_value(struct pt_regs *regs)
105{
106	return regs->areg[2];
107}
108
109int do_syscall_trace_enter(struct pt_regs *regs);
110void do_syscall_trace_leave(struct pt_regs *regs);
111
112#else	/* __ASSEMBLY__ */
113
114# include <asm/asm-offsets.h>
115#define PT_REGS_OFFSET	  (KERNEL_STACK_SIZE - PT_USER_SIZE)
116
117#endif	/* !__ASSEMBLY__ */
118
119#endif	/* _XTENSA_PTRACE_H */
120