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