1/*
2 *  linux/include/asm-arm/proc-armv/ptrace.h
3 *
4 *  Copyright (C) 1996-1999 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#ifndef __ASM_PROC_PTRACE_H
11#define __ASM_PROC_PTRACE_H
12
13#include <linux/config.h>
14
15#define USR26_MODE	0x00
16#define FIQ26_MODE	0x01
17#define IRQ26_MODE	0x02
18#define SVC26_MODE	0x03
19#define USR_MODE	0x10
20#define FIQ_MODE	0x11
21#define IRQ_MODE	0x12
22#define SVC_MODE	0x13
23#define ABT_MODE	0x17
24#define UND_MODE	0x1b
25#define SYSTEM_MODE	0x1f
26#define MODE_MASK	0x1f
27#define T_BIT		0x20
28#define F_BIT		0x40
29#define I_BIT		0x80
30#define CC_V_BIT	(1 << 28)
31#define CC_C_BIT	(1 << 29)
32#define CC_Z_BIT	(1 << 30)
33#define CC_N_BIT	(1 << 31)
34#define PCMASK		0
35
36#ifndef __ASSEMBLY__
37
38/* this struct defines the way the registers are stored on the
39   stack during a system call. */
40
41struct pt_regs {
42	long uregs[18];
43};
44
45#define ARM_cpsr	uregs[16]
46#define ARM_pc		uregs[15]
47#define ARM_lr		uregs[14]
48#define ARM_sp		uregs[13]
49#define ARM_ip		uregs[12]
50#define ARM_fp		uregs[11]
51#define ARM_r10		uregs[10]
52#define ARM_r9		uregs[9]
53#define ARM_r8		uregs[8]
54#define ARM_r7		uregs[7]
55#define ARM_r6		uregs[6]
56#define ARM_r5		uregs[5]
57#define ARM_r4		uregs[4]
58#define ARM_r3		uregs[3]
59#define ARM_r2		uregs[2]
60#define ARM_r1		uregs[1]
61#define ARM_r0		uregs[0]
62#define ARM_ORIG_r0	uregs[17]
63
64#ifdef __KERNEL__
65
66#define user_mode(regs)	\
67	(((regs)->ARM_cpsr & 0xf) == 0)
68
69#ifdef CONFIG_ARM_THUMB
70#define thumb_mode(regs) \
71	(((regs)->ARM_cpsr & T_BIT))
72#else
73#define thumb_mode(regs) (0)
74#endif
75
76#define processor_mode(regs) \
77	((regs)->ARM_cpsr & MODE_MASK)
78
79#define interrupts_enabled(regs) \
80	(!((regs)->ARM_cpsr & I_BIT))
81
82#define fast_interrupts_enabled(regs) \
83	(!((regs)->ARM_cpsr & F_BIT))
84
85#define condition_codes(regs) \
86	((regs)->ARM_cpsr & (CC_V_BIT|CC_C_BIT|CC_Z_BIT|CC_N_BIT))
87
88/* Are the current registers suitable for user mode?
89 * (used to maintain security in signal handlers)
90 */
91static inline int valid_user_regs(struct pt_regs *regs)
92{
93	if ((regs->ARM_cpsr & 0xf) == 0 &&
94	    (regs->ARM_cpsr & (F_BIT|I_BIT)) == 0)
95		return 1;
96
97	/*
98	 * Force CPSR to something logical...
99	 */
100	regs->ARM_cpsr &= (CC_V_BIT|CC_C_BIT|CC_Z_BIT|CC_N_BIT|0x10);
101
102	return 0;
103}
104
105#endif	/* __KERNEL__ */
106
107#endif	/* __ASSEMBLY__ */
108
109#endif
110
111