2 * linux/include/asm-arm/proc-armo/ptrace.h
4 * Copyright (C) 1996-1999 Russell King
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.
10 #ifndef __ASM_PROC_PTRACE_H
11 #define __ASM_PROC_PTRACE_H
13 #define USR26_MODE 0x00
14 #define FIQ26_MODE 0x01
15 #define IRQ26_MODE 0x02
16 #define SVC26_MODE 0x03
17 #define MODE_MASK 0x03
18 #define F_BIT (1 << 26)
19 #define I_BIT (1 << 27)
20 #define CC_V_BIT (1 << 28)
21 #define CC_C_BIT (1 << 29)
22 #define CC_Z_BIT (1 << 30)
23 #define CC_N_BIT (1 << 31)
24 #define PCMASK 0xfc000003
28 /* this struct defines the way the registers are stored on the
29 stack during a system call. */
35 #define ARM_pc uregs[15]
36 #define ARM_lr uregs[14]
37 #define ARM_sp uregs[13]
38 #define ARM_ip uregs[12]
39 #define ARM_fp uregs[11]
40 #define ARM_r10 uregs[10]
41 #define ARM_r9 uregs[9]
42 #define ARM_r8 uregs[8]
43 #define ARM_r7 uregs[7]
44 #define ARM_r6 uregs[6]
45 #define ARM_r5 uregs[5]
46 #define ARM_r4 uregs[4]
47 #define ARM_r3 uregs[3]
48 #define ARM_r2 uregs[2]
49 #define ARM_r1 uregs[1]
50 #define ARM_r0 uregs[0]
51 #define ARM_ORIG_r0 uregs[16]
55 #define processor_mode(regs) \
56 ((regs)->ARM_pc & MODE_MASK)
58 #define user_mode(regs) \
59 (processor_mode(regs) == USR26_MODE)
61 #define thumb_mode(regs) (0)
63 #define interrupts_enabled(regs) \
64 (!((regs)->ARM_pc & I_BIT))
66 #define fast_interrupts_enabled(regs) \
67 (!((regs)->ARM_pc & F_BIT))
69 #define condition_codes(regs) \
70 ((regs)->ARM_pc & (CC_V_BIT|CC_C_BIT|CC_Z_BIT|CC_N_BIT))
72 /* Are the current registers suitable for user mode?
73 * (used to maintain security in signal handlers)
75 static inline int valid_user_regs(struct pt_regs *regs)
77 if (user_mode(regs) &&
78 (regs->ARM_pc & (F_BIT | I_BIT)) == 0)
82 * force it to be something sensible
84 regs->ARM_pc &= ~(MODE_MASK | F_BIT | I_BIT);
89 #endif /* __KERNEL__ */
91 #endif /* __ASSEMBLY__ */