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Linux kernel mirror (for testing)
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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_F_BIT 0x00000040
50#define COMPAT_PSR_I_BIT 0x00000080
51#define COMPAT_PSR_A_BIT 0x00000100
52#define COMPAT_PSR_E_BIT 0x00000200
53#define COMPAT_PSR_J_BIT 0x01000000
54#define COMPAT_PSR_Q_BIT 0x08000000
55#define COMPAT_PSR_V_BIT 0x10000000
56#define COMPAT_PSR_C_BIT 0x20000000
57#define COMPAT_PSR_Z_BIT 0x40000000
58#define COMPAT_PSR_N_BIT 0x80000000
59#define COMPAT_PSR_IT_MASK 0x0600fc00 /* If-Then execution state mask */
60#define COMPAT_PSR_GE_MASK 0x000f0000
61
62#ifdef CONFIG_CPU_BIG_ENDIAN
63#define COMPAT_PSR_ENDSTATE COMPAT_PSR_E_BIT
64#else
65#define COMPAT_PSR_ENDSTATE 0
66#endif
67
68/*
69 * These are 'magic' values for PTRACE_PEEKUSR that return info about where a
70 * process is located in memory.
71 */
72#define COMPAT_PT_TEXT_ADDR 0x10000
73#define COMPAT_PT_DATA_ADDR 0x10004
74#define COMPAT_PT_TEXT_END_ADDR 0x10008
75
76/*
77 * If pt_regs.syscallno == NO_SYSCALL, then the thread is not executing
78 * a syscall -- i.e., its most recent entry into the kernel from
79 * userspace was not via SVC, or otherwise a tracer cancelled the syscall.
80 *
81 * This must have the value -1, for ABI compatibility with ptrace etc.
82 */
83#define NO_SYSCALL (-1)
84
85#ifndef __ASSEMBLY__
86#include <linux/bug.h>
87#include <linux/types.h>
88
89/* sizeof(struct user) for AArch32 */
90#define COMPAT_USER_SZ 296
91
92/* Architecturally defined mapping between AArch32 and AArch64 registers */
93#define compat_usr(x) regs[(x)]
94#define compat_fp regs[11]
95#define compat_sp regs[13]
96#define compat_lr regs[14]
97#define compat_sp_hyp regs[15]
98#define compat_lr_irq regs[16]
99#define compat_sp_irq regs[17]
100#define compat_lr_svc regs[18]
101#define compat_sp_svc regs[19]
102#define compat_lr_abt regs[20]
103#define compat_sp_abt regs[21]
104#define compat_lr_und regs[22]
105#define compat_sp_und regs[23]
106#define compat_r8_fiq regs[24]
107#define compat_r9_fiq regs[25]
108#define compat_r10_fiq regs[26]
109#define compat_r11_fiq regs[27]
110#define compat_r12_fiq regs[28]
111#define compat_sp_fiq regs[29]
112#define compat_lr_fiq regs[30]
113
114/*
115 * This struct defines the way the registers are stored on the stack during an
116 * exception. Note that sizeof(struct pt_regs) has to be a multiple of 16 (for
117 * stack alignment). struct user_pt_regs must form a prefix of struct pt_regs.
118 */
119struct pt_regs {
120 union {
121 struct user_pt_regs user_regs;
122 struct {
123 u64 regs[31];
124 u64 sp;
125 u64 pc;
126 u64 pstate;
127 };
128 };
129 u64 orig_x0;
130#ifdef __AARCH64EB__
131 u32 unused2;
132 s32 syscallno;
133#else
134 s32 syscallno;
135 u32 unused2;
136#endif
137
138 u64 orig_addr_limit;
139 u64 unused; // maintain 16 byte alignment
140 u64 stackframe[2];
141};
142
143static inline bool in_syscall(struct pt_regs const *regs)
144{
145 return regs->syscallno != NO_SYSCALL;
146}
147
148static inline void forget_syscall(struct pt_regs *regs)
149{
150 regs->syscallno = NO_SYSCALL;
151}
152
153#define MAX_REG_OFFSET offsetof(struct pt_regs, pstate)
154
155#define arch_has_single_step() (1)
156
157#ifdef CONFIG_COMPAT
158#define compat_thumb_mode(regs) \
159 (((regs)->pstate & COMPAT_PSR_T_BIT))
160#else
161#define compat_thumb_mode(regs) (0)
162#endif
163
164#define user_mode(regs) \
165 (((regs)->pstate & PSR_MODE_MASK) == PSR_MODE_EL0t)
166
167#define compat_user_mode(regs) \
168 (((regs)->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) == \
169 (PSR_MODE32_BIT | PSR_MODE_EL0t))
170
171#define processor_mode(regs) \
172 ((regs)->pstate & PSR_MODE_MASK)
173
174#define interrupts_enabled(regs) \
175 (!((regs)->pstate & PSR_I_BIT))
176
177#define fast_interrupts_enabled(regs) \
178 (!((regs)->pstate & PSR_F_BIT))
179
180#define GET_USP(regs) \
181 (!compat_user_mode(regs) ? (regs)->sp : (regs)->compat_sp)
182
183#define SET_USP(ptregs, value) \
184 (!compat_user_mode(regs) ? ((regs)->sp = value) : ((regs)->compat_sp = value))
185
186extern int regs_query_register_offset(const char *name);
187extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
188 unsigned int n);
189
190/**
191 * regs_get_register() - get register value from its offset
192 * @regs: pt_regs from which register value is gotten
193 * @offset: offset of the register.
194 *
195 * regs_get_register returns the value of a register whose offset from @regs.
196 * The @offset is the offset of the register in struct pt_regs.
197 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
198 */
199static inline u64 regs_get_register(struct pt_regs *regs, unsigned int offset)
200{
201 u64 val = 0;
202
203 WARN_ON(offset & 7);
204
205 offset >>= 3;
206 switch (offset) {
207 case 0 ... 30:
208 val = regs->regs[offset];
209 break;
210 case offsetof(struct pt_regs, sp) >> 3:
211 val = regs->sp;
212 break;
213 case offsetof(struct pt_regs, pc) >> 3:
214 val = regs->pc;
215 break;
216 case offsetof(struct pt_regs, pstate) >> 3:
217 val = regs->pstate;
218 break;
219 default:
220 val = 0;
221 }
222
223 return val;
224}
225
226/*
227 * Read a register given an architectural register index r.
228 * This handles the common case where 31 means XZR, not SP.
229 */
230static inline unsigned long pt_regs_read_reg(const struct pt_regs *regs, int r)
231{
232 return (r == 31) ? 0 : regs->regs[r];
233}
234
235/*
236 * Write a register given an architectural register index r.
237 * This handles the common case where 31 means XZR, not SP.
238 */
239static inline void pt_regs_write_reg(struct pt_regs *regs, int r,
240 unsigned long val)
241{
242 if (r != 31)
243 regs->regs[r] = val;
244}
245
246/* Valid only for Kernel mode traps. */
247static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
248{
249 return regs->sp;
250}
251
252static inline unsigned long regs_return_value(struct pt_regs *regs)
253{
254 return regs->regs[0];
255}
256
257/* We must avoid circular header include via sched.h */
258struct task_struct;
259int valid_user_regs(struct user_pt_regs *regs, struct task_struct *task);
260
261#define GET_IP(regs) ((unsigned long)(regs)->pc)
262#define SET_IP(regs, value) ((regs)->pc = ((u64) (value)))
263
264#define GET_FP(ptregs) ((unsigned long)(ptregs)->regs[29])
265#define SET_FP(ptregs, value) ((ptregs)->regs[29] = ((u64) (value)))
266
267#include <asm-generic/ptrace.h>
268
269#define procedure_link_pointer(regs) ((regs)->regs[30])
270
271static inline void procedure_link_pointer_set(struct pt_regs *regs,
272 unsigned long val)
273{
274 procedure_link_pointer(regs) = val;
275}
276
277#undef profile_pc
278extern unsigned long profile_pc(struct pt_regs *regs);
279
280#endif /* __ASSEMBLY__ */
281#endif