blob: 2848a5ff8349bb8a18aa91f709abdb25c12f0f52 [file] [log] [blame]
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
14#include <xtensa/config/core.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 KERNEL_STACK_SIZE (2 * PAGE_SIZE)
43
44/* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */
45
46#define EXC_TABLE_KSTK 0x004 /* Kernel Stack */
47#define EXC_TABLE_DOUBLE_SAVE 0x008 /* Double exception save area for a0 */
48#define EXC_TABLE_FIXUP 0x00c /* Fixup handler */
49#define EXC_TABLE_PARAM 0x010 /* For passing a parameter to fixup */
50#define EXC_TABLE_SYSCALL_SAVE 0x014 /* For fast syscall handler */
51#define EXC_TABLE_FAST_USER 0x100 /* Fast user exception handler */
52#define EXC_TABLE_FAST_KERNEL 0x200 /* Fast kernel exception handler */
53#define EXC_TABLE_DEFAULT 0x300 /* Default C-Handler */
54#define EXC_TABLE_SIZE 0x400
55
56/* Registers used by strace */
57
58#define REG_A_BASE 0xfc000000
59#define REG_AR_BASE 0x04000000
60#define REG_PC 0x14000000
61#define REG_PS 0x080000e6
62#define REG_WB 0x08000048
63#define REG_WS 0x08000049
64#define REG_LBEG 0x08000000
65#define REG_LEND 0x08000001
66#define REG_LCOUNT 0x08000002
67#define REG_SAR 0x08000003
68#define REG_DEPC 0x080000c0
69#define REG_EXCCAUSE 0x080000e8
70#define REG_EXCVADDR 0x080000ee
71#define SYSCALL_NR 0x1
72
73#define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1)
74
75/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
76
77#define PTRACE_GETREGS 12
78#define PTRACE_SETREGS 13
79#define PTRACE_GETFPREGS 14
80#define PTRACE_SETFPREGS 15
81#define PTRACE_GETFPREGSIZE 18
82
83#ifndef __ASSEMBLY__
84
85/*
86 * This struct defines the way the registers are stored on the
87 * kernel stack during a system call or other kernel entry.
88 */
89struct pt_regs {
90 unsigned long pc; /* 4 */
91 unsigned long ps; /* 8 */
92 unsigned long depc; /* 12 */
93 unsigned long exccause; /* 16 */
94 unsigned long excvaddr; /* 20 */
95 unsigned long debugcause; /* 24 */
96 unsigned long wmask; /* 28 */
97 unsigned long lbeg; /* 32 */
98 unsigned long lend; /* 36 */
99 unsigned long lcount; /* 40 */
100 unsigned long sar; /* 44 */
101 unsigned long windowbase; /* 48 */
102 unsigned long windowstart; /* 52 */
103 unsigned long syscall; /* 56 */
104 int reserved[2]; /* 64 */
105
106 /* Make sure the areg field is 16 bytes aligned. */
107 int align[0] __attribute__ ((aligned(16)));
108
109 /* current register frame.
110 * Note: The ESF for kernel exceptions ends after 16 registers!
111 */
112 unsigned long areg[16]; /* 128 (64) */
113};
114
115#ifdef __KERNEL__
116# define xtensa_pt_regs(tsk) ((struct pt_regs*) \
117 (((long)(tsk)->thread_info + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4)) - 1)
118# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
119# define instruction_pointer(regs) ((regs)->pc)
120extern void show_regs(struct pt_regs *);
121
122# ifndef CONFIG_SMP
123# define profile_pc(regs) instruction_pointer(regs)
124# endif
125#endif /* __KERNEL__ */
126
127#else /* __ASSEMBLY__ */
128
129#ifdef __KERNEL__
130# include <asm/offsets.h>
131#define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE)
132#endif
133
134#endif /* !__ASSEMBLY__ */
135#endif /* _XTENSA_PTRACE_H */