ptrace.h revision 4262a727621ceadfb38cb90a69804b6ee6be746e 
1/*
2 * Based on arch/arm/include/asm/ptrace.h
3 *
4 * Copyright (C) 1996-2003 Russell King
5 * Copyright (C) 2012 ARM Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18 */
19#ifndef __ASM_PTRACE_H
20#define __ASM_PTRACE_H
21
22#include <uapi/asm/ptrace.h>
23
24/* AArch32-specific ptrace requests */
25#define COMPAT_PTRACE_GETREGS		12
26#define COMPAT_PTRACE_SETREGS		13
27#define COMPAT_PTRACE_GET_THREAD_AREA	22
28#define COMPAT_PTRACE_SET_SYSCALL	23
29#define COMPAT_PTRACE_GETVFPREGS	27
30#define COMPAT_PTRACE_SETVFPREGS	28
31#define COMPAT_PTRACE_GETHBPREGS	29
32#define COMPAT_PTRACE_SETHBPREGS	30
33#define COMPAT_PSR_MODE_USR	0x00000010
34#define COMPAT_PSR_T_BIT	0x00000020
35#define COMPAT_PSR_IT_MASK	0x0600fc00	/* If-Then execution state mask */
36/*
37 * These are 'magic' values for PTRACE_PEEKUSR that return info about where a
38 * process is located in memory.
39 */
40#define COMPAT_PT_TEXT_ADDR		0x10000
41#define COMPAT_PT_DATA_ADDR		0x10004
42#define COMPAT_PT_TEXT_END_ADDR		0x10008
43#ifndef __ASSEMBLY__
44
45/* sizeof(struct user) for AArch32 */
46#define COMPAT_USER_SZ	296
47/* AArch32 uses x13 as the stack pointer... */
48#define compat_sp	regs[13]
49/* ... and x14 as the link register. */
50#define compat_lr	regs[14]
51
52/*
53 * This struct defines the way the registers are stored on the stack during an
54 * exception. Note that sizeof(struct pt_regs) has to be a multiple of 16 (for
55 * stack alignment). struct user_pt_regs must form a prefix of struct pt_regs.
56 */
57struct pt_regs {
58	union {
59		struct user_pt_regs user_regs;
60		struct {
61			u64 regs[31];
62			u64 sp;
63			u64 pc;
64			u64 pstate;
65		};
66	};
67	u64 orig_x0;
68	u64 syscallno;
69};
70
71#define arch_has_single_step()	(1)
72
73#ifdef CONFIG_COMPAT
74#define compat_thumb_mode(regs) \
75	(((regs)->pstate & COMPAT_PSR_T_BIT))
76#else
77#define compat_thumb_mode(regs) (0)
78#endif
79
80#define user_mode(regs)	\
81	(((regs)->pstate & PSR_MODE_MASK) == PSR_MODE_EL0t)
82
83#define compat_user_mode(regs)	\
84	(((regs)->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) == \
85	 (PSR_MODE32_BIT | PSR_MODE_EL0t))
86
87#define processor_mode(regs) \
88	((regs)->pstate & PSR_MODE_MASK)
89
90#define interrupts_enabled(regs) \
91	(!((regs)->pstate & PSR_I_BIT))
92
93#define fast_interrupts_enabled(regs) \
94	(!((regs)->pstate & PSR_F_BIT))
95
96#define user_stack_pointer(regs) \
97	((regs)->sp)
98
99/*
100 * Are the current registers suitable for user mode? (used to maintain
101 * security in signal handlers)
102 */
103static inline int valid_user_regs(struct user_pt_regs *regs)
104{
105	if (user_mode(regs) && (regs->pstate & PSR_I_BIT) == 0) {
106		regs->pstate &= ~(PSR_F_BIT | PSR_A_BIT);
107
108		/* The T bit is reserved for AArch64 */
109		if (!(regs->pstate & PSR_MODE32_BIT))
110			regs->pstate &= ~COMPAT_PSR_T_BIT;
111
112		return 1;
113	}
114
115	/*
116	 * Force PSR to something logical...
117	 */
118	regs->pstate &= PSR_f | PSR_s | (PSR_x & ~PSR_A_BIT) | \
119			COMPAT_PSR_T_BIT | PSR_MODE32_BIT;
120
121	if (!(regs->pstate & PSR_MODE32_BIT)) {
122		regs->pstate &= ~COMPAT_PSR_T_BIT;
123		regs->pstate |= PSR_MODE_EL0t;
124	}
125
126	return 0;
127}
128
129#define instruction_pointer(regs)	(regs)->pc
130
131#ifdef CONFIG_SMP
132extern unsigned long profile_pc(struct pt_regs *regs);
133#else
134#define profile_pc(regs) instruction_pointer(regs)
135#endif
136
137extern int aarch32_break_trap(struct pt_regs *regs);
138
139#endif /* __ASSEMBLY__ */
140#endif
141