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Chris Zankel9a8fd552005-06-23 22:01:26 -07001/*
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
Chris Zankel9a8fd552005-06-23 22:01:26 -070014/*
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
Chris Zankelc658eac2008-02-12 13:17:07 -080056#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
Chris Zankel9a8fd552005-06-23 22:01:26 -070066
Chris Zankelc658eac2008-02-12 13:17:07 -080067#define SYSCALL_NR 0x00ff
Chris Zankel9a8fd552005-06-23 22:01:26 -070068
69/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
70
Chris Zankelc658eac2008-02-12 13:17:07 -080071#define PTRACE_GETREGS 12
72#define PTRACE_SETREGS 13
73#define PTRACE_GETXTREGS 18
74#define PTRACE_SETXTREGS 19
Chris Zankel9a8fd552005-06-23 22:01:26 -070075
Chris Zankelc658eac2008-02-12 13:17:07 -080076#ifdef __KERNEL__
77
Adrian Bunkf22ab812008-07-25 01:47:34 -070078#ifndef __ASSEMBLY__
79
Chris Zankel4573e392010-05-02 01:05:13 -070080#include <asm/coprocessor.h>
81
Chris Zankel9a8fd552005-06-23 22:01:26 -070082/*
83 * This struct defines the way the registers are stored on the
84 * kernel stack during a system call or other kernel entry.
85 */
86struct pt_regs {
87 unsigned long pc; /* 4 */
88 unsigned long ps; /* 8 */
89 unsigned long depc; /* 12 */
90 unsigned long exccause; /* 16 */
91 unsigned long excvaddr; /* 20 */
92 unsigned long debugcause; /* 24 */
93 unsigned long wmask; /* 28 */
94 unsigned long lbeg; /* 32 */
95 unsigned long lend; /* 36 */
96 unsigned long lcount; /* 40 */
97 unsigned long sar; /* 44 */
98 unsigned long windowbase; /* 48 */
99 unsigned long windowstart; /* 52 */
100 unsigned long syscall; /* 56 */
Chris Zankel29c4dfd2007-05-31 17:49:32 -0700101 unsigned long icountlevel; /* 60 */
102 int reserved[1]; /* 64 */
Chris Zankel9a8fd552005-06-23 22:01:26 -0700103
Chris Zankelc658eac2008-02-12 13:17:07 -0800104 /* Additional configurable registers that are used by the compiler. */
105 xtregs_opt_t xtregs_opt;
106
Chris Zankel9a8fd552005-06-23 22:01:26 -0700107 /* Make sure the areg field is 16 bytes aligned. */
108 int align[0] __attribute__ ((aligned(16)));
109
110 /* current register frame.
111 * Note: The ESF for kernel exceptions ends after 16 registers!
112 */
113 unsigned long areg[16]; /* 128 (64) */
114};
115
Chris Zankel367b8112008-11-06 06:40:46 -0800116#include <variant/core.h>
Chris Zankelde4f6e52007-05-31 17:47:01 -0700117
Christoph Hellwig6d75ca12010-03-10 15:22:57 -0800118# define arch_has_single_step() (1)
Al Viro04fe6fa2006-01-12 01:05:50 -0800119# define task_pt_regs(tsk) ((struct pt_regs*) \
120 (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
Chris Zankel9a8fd552005-06-23 22:01:26 -0700121# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
122# define instruction_pointer(regs) ((regs)->pc)
Chris Zankel9a8fd552005-06-23 22:01:26 -0700123
124# ifndef CONFIG_SMP
125# define profile_pc(regs) instruction_pointer(regs)
126# endif
Chris Zankel9a8fd552005-06-23 22:01:26 -0700127
128#else /* __ASSEMBLY__ */
129
Sam Ravnborg0013a852005-09-09 20:57:26 +0200130# include <asm/asm-offsets.h>
Chris Zankel9a8fd552005-06-23 22:01:26 -0700131#define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE)
Chris Zankel9a8fd552005-06-23 22:01:26 -0700132
133#endif /* !__ASSEMBLY__ */
Adrian Bunkf22ab812008-07-25 01:47:34 -0700134
135#endif /* __KERNEL__ */
136
Chris Zankel9a8fd552005-06-23 22:01:26 -0700137#endif /* _XTENSA_PTRACE_H */