ptrace.h revision 9e7934bb27b71f4bd99ce5074e494731ab403ff9 
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/* Current Exception Level values, as contained in CurrentEL */
25#define CurrentEL_EL1		(1 << 2)
26#define CurrentEL_EL2		(2 << 2)
27
28/* AArch32-specific ptrace requests */
29#define COMPAT_PTRACE_GETREGS		12
30#define COMPAT_PTRACE_SETREGS		13
31#define COMPAT_PTRACE_GET_THREAD_AREA	22
32#define COMPAT_PTRACE_SET_SYSCALL	23
33#define COMPAT_PTRACE_GETVFPREGS	27
34#define COMPAT_PTRACE_SETVFPREGS	28
35#define COMPAT_PTRACE_GETHBPREGS	29
36#define COMPAT_PTRACE_SETHBPREGS	30
37
38/* AArch32 CPSR bits */
39#define COMPAT_PSR_MODE_MASK	0x0000001f
40#define COMPAT_PSR_MODE_USR	0x00000010
41#define COMPAT_PSR_MODE_FIQ	0x00000011
42#define COMPAT_PSR_MODE_IRQ	0x00000012
43#define COMPAT_PSR_MODE_SVC	0x00000013
44#define COMPAT_PSR_MODE_ABT	0x00000017
45#define COMPAT_PSR_MODE_HYP	0x0000001a
46#define COMPAT_PSR_MODE_UND	0x0000001b
47#define COMPAT_PSR_MODE_SYS	0x0000001f
48#define COMPAT_PSR_T_BIT	0x00000020
49#define COMPAT_PSR_E_BIT	0x00000200
50#define COMPAT_PSR_F_BIT	0x00000040
51#define COMPAT_PSR_I_BIT	0x00000080
52#define COMPAT_PSR_A_BIT	0x00000100
53#define COMPAT_PSR_E_BIT	0x00000200
54#define COMPAT_PSR_J_BIT	0x01000000
55#define COMPAT_PSR_Q_BIT	0x08000000
56#define COMPAT_PSR_V_BIT	0x10000000
57#define COMPAT_PSR_C_BIT	0x20000000
58#define COMPAT_PSR_Z_BIT	0x40000000
59#define COMPAT_PSR_N_BIT	0x80000000
60#define COMPAT_PSR_IT_MASK	0x0600fc00	/* If-Then execution state mask */
61/*
62 * These are 'magic' values for PTRACE_PEEKUSR that return info about where a
63 * process is located in memory.
64 */
65#define COMPAT_PT_TEXT_ADDR		0x10000
66#define COMPAT_PT_DATA_ADDR		0x10004
67#define COMPAT_PT_TEXT_END_ADDR		0x10008
68
69/*
70 * used to skip a system call when tracer changes its number to -1
71 * with ptrace(PTRACE_SET_SYSCALL)
72 */
73#define RET_SKIP_SYSCALL	-1
74#define RET_SKIP_SYSCALL_TRACE	-2
75#define IS_SKIP_SYSCALL(no)	((int)(no & 0xffffffff) == -1)
76
77#ifndef __ASSEMBLY__
78
79/* sizeof(struct user) for AArch32 */
80#define COMPAT_USER_SZ	296
81
82/* Architecturally defined mapping between AArch32 and AArch64 registers */
83#define compat_usr(x)	regs[(x)]
84#define compat_fp	regs[11]
85#define compat_sp	regs[13]
86#define compat_lr	regs[14]
87#define compat_sp_hyp	regs[15]
88#define compat_sp_irq	regs[16]
89#define compat_lr_irq	regs[17]
90#define compat_sp_svc	regs[18]
91#define compat_lr_svc	regs[19]
92#define compat_sp_abt	regs[20]
93#define compat_lr_abt	regs[21]
94#define compat_sp_und	regs[22]
95#define compat_lr_und	regs[23]
96#define compat_r8_fiq	regs[24]
97#define compat_r9_fiq	regs[25]
98#define compat_r10_fiq	regs[26]
99#define compat_r11_fiq	regs[27]
100#define compat_r12_fiq	regs[28]
101#define compat_sp_fiq	regs[29]
102#define compat_lr_fiq	regs[30]
103
104/*
105 * This struct defines the way the registers are stored on the stack during an
106 * exception. Note that sizeof(struct pt_regs) has to be a multiple of 16 (for
107 * stack alignment). struct user_pt_regs must form a prefix of struct pt_regs.
108 */
109struct pt_regs {
110	union {
111		struct user_pt_regs user_regs;
112		struct {
113			u64 regs[31];
114			u64 sp;
115			u64 pc;
116			u64 pstate;
117		};
118	};
119	u64 orig_x0;
120	u64 syscallno;
121};
122
123#define arch_has_single_step()	(1)
124
125#ifdef CONFIG_COMPAT
126#define compat_thumb_mode(regs) \
127	(((regs)->pstate & COMPAT_PSR_T_BIT))
128#else
129#define compat_thumb_mode(regs) (0)
130#endif
131
132#define user_mode(regs)	\
133	(((regs)->pstate & PSR_MODE_MASK) == PSR_MODE_EL0t)
134
135#define compat_user_mode(regs)	\
136	(((regs)->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) == \
137	 (PSR_MODE32_BIT | PSR_MODE_EL0t))
138
139#define processor_mode(regs) \
140	((regs)->pstate & PSR_MODE_MASK)
141
142#define interrupts_enabled(regs) \
143	(!((regs)->pstate & PSR_I_BIT))
144
145#define fast_interrupts_enabled(regs) \
146	(!((regs)->pstate & PSR_F_BIT))
147
148#define user_stack_pointer(regs) \
149	(!compat_user_mode(regs) ? (regs)->sp : (regs)->compat_sp)
150
151static inline unsigned long regs_return_value(struct pt_regs *regs)
152{
153	return regs->regs[0];
154}
155
156/*
157 * Are the current registers suitable for user mode? (used to maintain
158 * security in signal handlers)
159 */
160static inline int valid_user_regs(struct user_pt_regs *regs)
161{
162	if (user_mode(regs) && (regs->pstate & PSR_I_BIT) == 0) {
163		regs->pstate &= ~(PSR_F_BIT | PSR_A_BIT);
164
165		/* The T bit is reserved for AArch64 */
166		if (!(regs->pstate & PSR_MODE32_BIT))
167			regs->pstate &= ~COMPAT_PSR_T_BIT;
168
169		return 1;
170	}
171
172	/*
173	 * Force PSR to something logical...
174	 */
175	regs->pstate &= PSR_f | PSR_s | (PSR_x & ~PSR_A_BIT) | \
176			COMPAT_PSR_T_BIT | PSR_MODE32_BIT;
177
178	if (!(regs->pstate & PSR_MODE32_BIT)) {
179		regs->pstate &= ~COMPAT_PSR_T_BIT;
180		regs->pstate |= PSR_MODE_EL0t;
181	}
182
183	return 0;
184}
185
186#define instruction_pointer(regs)	((unsigned long)(regs)->pc)
187
188#ifdef CONFIG_SMP
189extern unsigned long profile_pc(struct pt_regs *regs);
190#else
191#define profile_pc(regs) instruction_pointer(regs)
192#endif
193
194#endif /* __ASSEMBLY__ */
195#endif
196