1/*
2 *  linux/include/asm-arm/proc-armo/ptrace.h
3 *
4 *  Copyright (C) 1996-2001 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#define USR26_MODE	0x00
14#define FIQ26_MODE	0x01
15#define IRQ26_MODE	0x02
16#define SVC26_MODE	0x03
17#define USR_MODE	USR26_MODE
18#define FIQ_MODE	FIQ26_MODE
19#define IRQ_MODE	IRQ26_MODE
20#define SVC_MODE	SVC26_MODE
21#define MODE_MASK	0x03
22#define F_BIT		(1 << 26)
23#define I_BIT		(1 << 27)
24#define CC_V_BIT	(1 << 28)
25#define CC_C_BIT	(1 << 29)
26#define CC_Z_BIT	(1 << 30)
27#define CC_N_BIT	(1 << 31)
28#define PCMASK		0xfc000003
29
30#ifndef __ASSEMBLY__
31
32/* this struct defines the way the registers are stored on the
33   stack during a system call. */
34
35struct pt_regs {
36	long uregs[17];
37};
38
39#define ARM_pc		uregs[15]
40#define ARM_lr		uregs[14]
41#define ARM_sp		uregs[13]
42#define ARM_ip		uregs[12]
43#define ARM_fp		uregs[11]
44#define ARM_r10		uregs[10]
45#define ARM_r9		uregs[9]
46#define ARM_r8		uregs[8]
47#define ARM_r7		uregs[7]
48#define ARM_r6		uregs[6]
49#define ARM_r5		uregs[5]
50#define ARM_r4		uregs[4]
51#define ARM_r3		uregs[3]
52#define ARM_r2		uregs[2]
53#define ARM_r1		uregs[1]
54#define ARM_r0		uregs[0]
55#define ARM_ORIG_r0	uregs[16]
56
57#ifdef __KERNEL__
58
59#define processor_mode(regs) \
60	((regs)->ARM_pc & MODE_MASK)
61
62#define user_mode(regs) \
63	(processor_mode(regs) == USR26_MODE)
64
65#define thumb_mode(regs) (0)
66
67#define interrupts_enabled(regs) \
68	(!((regs)->ARM_pc & I_BIT))
69
70#define fast_interrupts_enabled(regs) \
71	(!((regs)->ARM_pc & F_BIT))
72
73#define condition_codes(regs) \
74	((regs)->ARM_pc & (CC_V_BIT|CC_C_BIT|CC_Z_BIT|CC_N_BIT))
75
76/* Are the current registers suitable for user mode?
77 * (used to maintain security in signal handlers)
78 */
79static inline int valid_user_regs(struct pt_regs *regs)
80{
81	if (user_mode(regs) &&
82	    (regs->ARM_pc & (F_BIT | I_BIT)) == 0)
83		return 1;
84
85	/*
86	 * force it to be something sensible
87	 */
88	regs->ARM_pc &= ~(MODE_MASK | F_BIT | I_BIT);
89
90	return 0;
91}
92
93#endif	/* __KERNEL__ */
94
95#endif	/* __ASSEMBLY__ */
96
97#endif
98
99