blob: 77ff02d307bba119141aacfa733d51f01c137168 [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
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
56#define REG_A_BASE 0xfc000000
57#define REG_AR_BASE 0x04000000
58#define REG_PC 0x14000000
59#define REG_PS 0x080000e6
60#define REG_WB 0x08000048
61#define REG_WS 0x08000049
62#define REG_LBEG 0x08000000
63#define REG_LEND 0x08000001
64#define REG_LCOUNT 0x08000002
65#define REG_SAR 0x08000003
66#define REG_DEPC 0x080000c0
67#define REG_EXCCAUSE 0x080000e8
68#define REG_EXCVADDR 0x080000ee
69#define SYSCALL_NR 0x1
70
71#define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1)
72
73/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
74
75#define PTRACE_GETREGS 12
76#define PTRACE_SETREGS 13
77#define PTRACE_GETFPREGS 14
78#define PTRACE_SETFPREGS 15
79#define PTRACE_GETFPREGSIZE 18
80
81#ifndef __ASSEMBLY__
82
83/*
84 * This struct defines the way the registers are stored on the
85 * kernel stack during a system call or other kernel entry.
86 */
87struct pt_regs {
88 unsigned long pc; /* 4 */
89 unsigned long ps; /* 8 */
90 unsigned long depc; /* 12 */
91 unsigned long exccause; /* 16 */
92 unsigned long excvaddr; /* 20 */
93 unsigned long debugcause; /* 24 */
94 unsigned long wmask; /* 28 */
95 unsigned long lbeg; /* 32 */
96 unsigned long lend; /* 36 */
97 unsigned long lcount; /* 40 */
98 unsigned long sar; /* 44 */
99 unsigned long windowbase; /* 48 */
100 unsigned long windowstart; /* 52 */
101 unsigned long syscall; /* 56 */
Chris Zankel29c4dfd2007-05-31 17:49:32 -0700102 unsigned long icountlevel; /* 60 */
103 int reserved[1]; /* 64 */
Chris Zankel9a8fd552005-06-23 22:01:26 -0700104
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#ifdef __KERNEL__
Chris Zankelde4f6e52007-05-31 17:47:01 -0700115
116#include <asm/variant/core.h>
117
Al Viro04fe6fa2006-01-12 01:05:50 -0800118# define task_pt_regs(tsk) ((struct pt_regs*) \
119 (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
Chris Zankel9a8fd552005-06-23 22:01:26 -0700120# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
121# define instruction_pointer(regs) ((regs)->pc)
122extern void show_regs(struct pt_regs *);
123
124# ifndef CONFIG_SMP
125# define profile_pc(regs) instruction_pointer(regs)
126# endif
127#endif /* __KERNEL__ */
128
129#else /* __ASSEMBLY__ */
130
131#ifdef __KERNEL__
Sam Ravnborg0013a852005-09-09 20:57:26 +0200132# include <asm/asm-offsets.h>
Chris Zankel9a8fd552005-06-23 22:01:26 -0700133#define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE)
134#endif
135
136#endif /* !__ASSEMBLY__ */
137#endif /* _XTENSA_PTRACE_H */