1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * Copyright (C) 2001 - 2007 Tensilica Inc.
4 */
5
6#ifndef _XTENSA_PTRACE_H
7#define _XTENSA_PTRACE_H
8
9#include <compiler.h>
10
11/*
12 * Kernel stack
13 *
14 *		+-----------------------+  -------- STACK_SIZE
15 *		|     register file     |  |
16 *		+-----------------------+  |
17 *		|    struct pt_regs     |  |
18 *		+-----------------------+  | ------ PT_REGS_OFFSET
19 * double	:  16 bytes spill area  :  |  ^
20 * exception	:- - - - - - - - - - - -:  |  |
21 * frame	:    struct pt_regs     :  |  |
22 *		:- - - - - - - - - - - -:  |  |
23 *		|                       |  |  |
24 *		|     memory stack      |  |  |
25 *		|                       |  |  |
26 *		~                       ~  ~  ~
27 *		~                       ~  ~  ~
28 *		|                       |  |  |
29 *		|                       |  |  |
30 *		+-----------------------+  |  | --- STACK_BIAS
31 *		|  struct task_struct   |  |  |  ^
32 *  current --> +-----------------------+  |  |  |
33 *		|  struct thread_info   |  |  |  |
34 *		+-----------------------+ --------
35 */
36
37#define KERNEL_STACK_SIZE (2 * PAGE_SIZE)
38
39/*  Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables) */
40
41#define EXC_TABLE_KSTK		0x004	/* Kernel Stack */
42#define EXC_TABLE_DOUBLE_SAVE	0x008	/* Double exception save area for a0 */
43#define EXC_TABLE_FIXUP		0x00c	/* Fixup handler */
44#define EXC_TABLE_PARAM		0x010	/* For passing a parameter to fixup */
45#define EXC_TABLE_SYSCALL_SAVE	0x014	/* For fast syscall handler */
46#define EXC_TABLE_FAST_USER	0x100	/* Fast user exception handler */
47#define EXC_TABLE_FAST_KERNEL	0x200	/* Fast kernel exception handler */
48#define EXC_TABLE_DEFAULT	0x300	/* Default C-Handler */
49#define EXC_TABLE_SIZE		0x400
50
51/* Registers used by strace */
52
53#define REG_A_BASE	0xfc000000
54#define REG_AR_BASE	0x04000000
55#define REG_PC		0x14000000
56#define REG_PS		0x080000e6
57#define REG_WB		0x08000048
58#define REG_WS		0x08000049
59#define REG_LBEG	0x08000000
60#define REG_LEND	0x08000001
61#define REG_LCOUNT	0x08000002
62#define REG_SAR		0x08000003
63#define REG_DEPC	0x080000c0
64#define REG_EXCCAUSE	0x080000e8
65#define REG_EXCVADDR	0x080000ee
66#define SYSCALL_NR	0x1
67
68#define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1)
69
70/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
71
72#define PTRACE_GETREGS            12
73#define PTRACE_SETREGS            13
74#define PTRACE_GETFPREGS          14
75#define PTRACE_SETFPREGS          15
76#define PTRACE_GETFPREGSIZE       18
77
78#ifndef __ASSEMBLY__
79
80/*
81 * This struct defines the way the registers are stored on the
82 * kernel stack during a system call or other kernel entry.
83 */
84struct pt_regs {
85	unsigned long pc;		/*   4 */
86	unsigned long ps;		/*   8 */
87	unsigned long depc;		/*  12 */
88	unsigned long exccause;		/*  16 */
89	unsigned long excvaddr;		/*  20 */
90	unsigned long debugcause;	/*  24 */
91	unsigned long wmask;		/*  28 */
92	unsigned long lbeg;		/*  32 */
93	unsigned long lend;		/*  36 */
94	unsigned long lcount;		/*  40 */
95	unsigned long sar;		/*  44 */
96	unsigned long windowbase;	/*  48 */
97	unsigned long windowstart;	/*  52 */
98	unsigned long syscall;		/*  56 */
99	unsigned long icountlevel;	/*  60 */
100	int reserved[1];		/*  64 */
101
102	/* Make sure the areg field is 16 bytes aligned */
103	int align[0] __aligned(16);
104
105	/* current register frame.
106	 * Note: The ESF for kernel exceptions ends after 16 registers!
107	 */
108	unsigned long areg[16];		/* 128 (64) */
109};
110
111#ifdef __KERNEL__
112
113# define task_pt_regs(tsk) ((struct pt_regs *) \
114	(task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
115# define user_mode(regs) (((regs)->ps & 0x00000020) != 0)
116# define instruction_pointer(regs) ((regs)->pc)
117void show_regs(struct pt_regs *);
118
119# ifndef CONFIG_SMP
120#  define profile_pc(regs) instruction_pointer(regs)
121# endif
122#endif /* __KERNEL__ */
123
124#else	/* __ASSEMBLY__ */
125
126#ifdef __KERNEL__
127# include <asm/asm-offsets.h>
128#define PT_REGS_OFFSET	  (KERNEL_STACK_SIZE - PT_USER_SIZE)
129#endif
130
131#endif	/* !__ASSEMBLY__ */
132#endif	/* _XTENSA_PTRACE_H */
133