1 /*
2 * linux/include/asm-arm/ptrace.h
3 *
4 * Copyright (C) 1996-2003 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_ARM_PTRACE_H
11 #define __ASM_ARM_PTRACE_H
12
13 #include <asm/hwcap.h>
14
15 #define PTRACE_GETREGS 12
16 #define PTRACE_SETREGS 13
17 #define PTRACE_GETFPREGS 14
18 #define PTRACE_SETFPREGS 15
19 /* PTRACE_ATTACH is 16 */
20 /* PTRACE_DETACH is 17 */
21 #define PTRACE_GETWMMXREGS 18
22 #define PTRACE_SETWMMXREGS 19
23 /* 20 is unused */
24 #define PTRACE_OLDSETOPTIONS 21
25 #define PTRACE_GET_THREAD_AREA 22
26 #define PTRACE_SET_SYSCALL 23
27 /* PTRACE_SYSCALL is 24 */
28 #define PTRACE_GETCRUNCHREGS 25
29 #define PTRACE_SETCRUNCHREGS 26
30
31 /*
32 * PSR bits
33 */
34 #define USR26_MODE 0x00000000
35 #define FIQ26_MODE 0x00000001
36 #define IRQ26_MODE 0x00000002
37 #define SVC26_MODE 0x00000003
38 #define USR_MODE 0x00000010
39 #define FIQ_MODE 0x00000011
40 #define IRQ_MODE 0x00000012
41 #define SVC_MODE 0x00000013
42 #define ABT_MODE 0x00000017
43 #define UND_MODE 0x0000001b
44 #define SYSTEM_MODE 0x0000001f
45 #define MODE32_BIT 0x00000010
46 #define MODE_MASK 0x0000001f
47 #define PSR_T_BIT 0x00000020
48 #define PSR_F_BIT 0x00000040
49 #define PSR_I_BIT 0x00000080
50 #define PSR_A_BIT 0x00000100
51 #define PSR_J_BIT 0x01000000
52 #define PSR_Q_BIT 0x08000000
53 #define PSR_V_BIT 0x10000000
54 #define PSR_C_BIT 0x20000000
55 #define PSR_Z_BIT 0x40000000
56 #define PSR_N_BIT 0x80000000
57 #define PCMASK 0
58
59 /*
60 * Groups of PSR bits
61 */
62 #define PSR_f 0xff000000 /* Flags */
63 #define PSR_s 0x00ff0000 /* Status */
64 #define PSR_x 0x0000ff00 /* Extension */
65 #define PSR_c 0x000000ff /* Control */
66
67 #ifndef __ASSEMBLY__
68
69 /*
70 * This struct defines the way the registers are stored on the
71 * stack during a system call. Note that sizeof(struct pt_regs)
72 * has to be a multiple of 8.
73 */
74 struct pt_regs {
75 long uregs[18];
76 };
77
78 #define ARM_cpsr uregs[16]
79 #define ARM_pc uregs[15]
80 #define ARM_lr uregs[14]
81 #define ARM_sp uregs[13]
82 #define ARM_ip uregs[12]
83 #define ARM_fp uregs[11]
84 #define ARM_r10 uregs[10]
85 #define ARM_r9 uregs[9]
86 #define ARM_r8 uregs[8]
87 #define ARM_r7 uregs[7]
88 #define ARM_r6 uregs[6]
89 #define ARM_r5 uregs[5]
90 #define ARM_r4 uregs[4]
91 #define ARM_r3 uregs[3]
92 #define ARM_r2 uregs[2]
93 #define ARM_r1 uregs[1]
94 #define ARM_r0 uregs[0]
95 #define ARM_ORIG_r0 uregs[17]
96
97 #ifdef __KERNEL__
98
99 #define user_mode(regs) \
100 (((regs)->ARM_cpsr & 0xf) == 0)
101
102 #ifdef CONFIG_ARM_THUMB
103 #define thumb_mode(regs) \
104 (((regs)->ARM_cpsr & PSR_T_BIT))
105 #else
106 #define thumb_mode(regs) (0)
107 #endif
108
109 #define isa_mode(regs) \
110 ((((regs)->ARM_cpsr & PSR_J_BIT) >> 23) | \
111 (((regs)->ARM_cpsr & PSR_T_BIT) >> 5))
112
113 #define processor_mode(regs) \
114 ((regs)->ARM_cpsr & MODE_MASK)
115
116 #define interrupts_enabled(regs) \
117 (!((regs)->ARM_cpsr & PSR_I_BIT))
118
119 #define fast_interrupts_enabled(regs) \
120 (!((regs)->ARM_cpsr & PSR_F_BIT))
121
122 /* Are the current registers suitable for user mode?
123 * (used to maintain security in signal handlers)
124 */
125 static inline int valid_user_regs(struct pt_regs *regs)
126 {
127 if (user_mode(regs) && (regs->ARM_cpsr & PSR_I_BIT) == 0) {
128 regs->ARM_cpsr &= ~(PSR_F_BIT | PSR_A_BIT);
129 return 1;
130 }
131
132 /*
133 * Force CPSR to something logical...
134 */
135 regs->ARM_cpsr &= PSR_f | PSR_s | (PSR_x & ~PSR_A_BIT) | PSR_T_BIT | MODE32_BIT;
136 if (!(elf_hwcap & HWCAP_26BIT))
137 regs->ARM_cpsr |= USR_MODE;
138
139 return 0;
140 }
141
142 #endif /* __KERNEL__ */
143
144 #define pc_pointer(v) \
145 ((v) & ~PCMASK)
146
147 #define instruction_pointer(regs) \
148 (pc_pointer((regs)->ARM_pc))
149
150 #ifdef CONFIG_SMP
151 extern unsigned long profile_pc(struct pt_regs *regs);
152 #else
153 #define profile_pc(regs) instruction_pointer(regs)
154 #endif
155
156 #ifdef __KERNEL__
157 #define predicate(x) ((x) & 0xf0000000)
158 #define PREDICATE_ALWAYS 0xe0000000
159 #endif
160
161 #endif /* __ASSEMBLY__ */
162
163 #endif
164
165
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