1 #ifndef _ASM_X86_PTRACE_H
2 #define _ASM_X86_PTRACE_H
3
4 #include <linux/compiler.h> /* For __user */
5 #include <asm/ptrace-abi.h>
6 #include <asm/processor-flags.h>
7
8 #ifdef __KERNEL__
9 #include <asm/segment.h>
10 #include <asm/page_types.h>
11 #endif
12
13 #ifndef __ASSEMBLY__
14
15 #ifdef __i386__
16 /* this struct defines the way the registers are stored on the
17 stack during a system call. */
18
19 #ifndef __KERNEL__
20
21 struct pt_regs {
22 long ebx;
23 long ecx;
24 long edx;
25 long esi;
26 long edi;
27 long ebp;
28 long eax;
29 int xds;
30 int xes;
31 int xfs;
32 int xgs;
33 long orig_eax;
34 long eip;
35 int xcs;
36 long eflags;
37 long esp;
38 int xss;
39 };
40
41 #else /* __KERNEL__ */
42
43 struct pt_regs {
44 unsigned long bx;
45 unsigned long cx;
46 unsigned long dx;
47 unsigned long si;
48 unsigned long di;
49 unsigned long bp;
50 unsigned long ax;
51 unsigned long ds;
52 unsigned long es;
53 unsigned long fs;
54 unsigned long gs;
55 unsigned long orig_ax;
56 unsigned long ip;
57 unsigned long cs;
58 unsigned long flags;
59 unsigned long sp;
60 unsigned long ss;
61 };
62
63 #endif /* __KERNEL__ */
64
65 #else /* __i386__ */
66
67 #ifndef __KERNEL__
68
69 struct pt_regs {
70 unsigned long r15;
71 unsigned long r14;
72 unsigned long r13;
73 unsigned long r12;
74 unsigned long rbp;
75 unsigned long rbx;
76 /* arguments: non interrupts/non tracing syscalls only save up to here*/
77 unsigned long r11;
78 unsigned long r10;
79 unsigned long r9;
80 unsigned long r8;
81 unsigned long rax;
82 unsigned long rcx;
83 unsigned long rdx;
84 unsigned long rsi;
85 unsigned long rdi;
86 unsigned long orig_rax;
87 /* end of arguments */
88 /* cpu exception frame or undefined */
89 unsigned long rip;
90 unsigned long cs;
91 unsigned long eflags;
92 unsigned long rsp;
93 unsigned long ss;
94 /* top of stack page */
95 };
96
97 #else /* __KERNEL__ */
98
99 struct pt_regs {
100 unsigned long r15;
101 unsigned long r14;
102 unsigned long r13;
103 unsigned long r12;
104 unsigned long bp;
105 unsigned long bx;
106 /* arguments: non interrupts/non tracing syscalls only save up to here*/
107 unsigned long r11;
108 unsigned long r10;
109 unsigned long r9;
110 unsigned long r8;
111 unsigned long ax;
112 unsigned long cx;
113 unsigned long dx;
114 unsigned long si;
115 unsigned long di;
116 unsigned long orig_ax;
117 /* end of arguments */
118 /* cpu exception frame or undefined */
119 unsigned long ip;
120 unsigned long cs;
121 unsigned long flags;
122 unsigned long sp;
123 unsigned long ss;
124 /* top of stack page */
125 };
126
127 #endif /* __KERNEL__ */
128 #endif /* !__i386__ */
129
130
131 #ifdef __KERNEL__
132
133 #include <linux/init.h>
134 #ifdef CONFIG_PARAVIRT
135 #include <asm/paravirt_types.h>
136 #endif
137
138 struct cpuinfo_x86;
139 struct task_struct;
140
141 extern unsigned long profile_pc(struct pt_regs *regs);
142 #define profile_pc profile_pc
143
144 extern unsigned long
145 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
146 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
147 int error_code, int si_code);
148
149 extern long syscall_trace_enter(struct pt_regs *);
150 extern void syscall_trace_leave(struct pt_regs *);
151
regs_return_value(struct pt_regs * regs)152 static inline unsigned long regs_return_value(struct pt_regs *regs)
153 {
154 return regs->ax;
155 }
156
157 /*
158 * user_mode_vm(regs) determines whether a register set came from user mode.
159 * This is true if V8086 mode was enabled OR if the register set was from
160 * protected mode with RPL-3 CS value. This tricky test checks that with
161 * one comparison. Many places in the kernel can bypass this full check
162 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
163 */
user_mode(struct pt_regs * regs)164 static inline int user_mode(struct pt_regs *regs)
165 {
166 #ifdef CONFIG_X86_32
167 return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
168 #else
169 return !!(regs->cs & 3);
170 #endif
171 }
172
user_mode_vm(struct pt_regs * regs)173 static inline int user_mode_vm(struct pt_regs *regs)
174 {
175 #ifdef CONFIG_X86_32
176 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
177 USER_RPL;
178 #else
179 return user_mode(regs);
180 #endif
181 }
182
v8086_mode(struct pt_regs * regs)183 static inline int v8086_mode(struct pt_regs *regs)
184 {
185 #ifdef CONFIG_X86_32
186 return (regs->flags & X86_VM_MASK);
187 #else
188 return 0; /* No V86 mode support in long mode */
189 #endif
190 }
191
192 #ifdef CONFIG_X86_64
user_64bit_mode(struct pt_regs * regs)193 static inline bool user_64bit_mode(struct pt_regs *regs)
194 {
195 #ifndef CONFIG_PARAVIRT
196 /*
197 * On non-paravirt systems, this is the only long mode CPL 3
198 * selector. We do not allow long mode selectors in the LDT.
199 */
200 return regs->cs == __USER_CS;
201 #else
202 /* Headers are too twisted for this to go in paravirt.h. */
203 return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
204 #endif
205 }
206 #endif
207
208 #ifdef CONFIG_X86_32
209 extern unsigned long kernel_stack_pointer(struct pt_regs *regs);
210 #else
kernel_stack_pointer(struct pt_regs * regs)211 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
212 {
213 return regs->sp;
214 }
215 #endif
216
217 #define GET_IP(regs) ((regs)->ip)
218 #define GET_FP(regs) ((regs)->bp)
219 #define GET_USP(regs) ((regs)->sp)
220
221 #include <asm-generic/ptrace.h>
222
223 /* Query offset/name of register from its name/offset */
224 extern int regs_query_register_offset(const char *name);
225 extern const char *regs_query_register_name(unsigned int offset);
226 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
227
228 /**
229 * regs_get_register() - get register value from its offset
230 * @regs: pt_regs from which register value is gotten.
231 * @offset: offset number of the register.
232 *
233 * regs_get_register returns the value of a register. The @offset is the
234 * offset of the register in struct pt_regs address which specified by @regs.
235 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
236 */
regs_get_register(struct pt_regs * regs,unsigned int offset)237 static inline unsigned long regs_get_register(struct pt_regs *regs,
238 unsigned int offset)
239 {
240 if (unlikely(offset > MAX_REG_OFFSET))
241 return 0;
242 return *(unsigned long *)((unsigned long)regs + offset);
243 }
244
245 /**
246 * regs_within_kernel_stack() - check the address in the stack
247 * @regs: pt_regs which contains kernel stack pointer.
248 * @addr: address which is checked.
249 *
250 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
251 * If @addr is within the kernel stack, it returns true. If not, returns false.
252 */
regs_within_kernel_stack(struct pt_regs * regs,unsigned long addr)253 static inline int regs_within_kernel_stack(struct pt_regs *regs,
254 unsigned long addr)
255 {
256 return ((addr & ~(THREAD_SIZE - 1)) ==
257 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
258 }
259
260 /**
261 * regs_get_kernel_stack_nth() - get Nth entry of the stack
262 * @regs: pt_regs which contains kernel stack pointer.
263 * @n: stack entry number.
264 *
265 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
266 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
267 * this returns 0.
268 */
regs_get_kernel_stack_nth(struct pt_regs * regs,unsigned int n)269 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
270 unsigned int n)
271 {
272 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
273 addr += n;
274 if (regs_within_kernel_stack(regs, (unsigned long)addr))
275 return *addr;
276 else
277 return 0;
278 }
279
280 #define arch_has_single_step() (1)
281 #ifdef CONFIG_X86_DEBUGCTLMSR
282 #define arch_has_block_step() (1)
283 #else
284 #define arch_has_block_step() (boot_cpu_data.x86 >= 6)
285 #endif
286
287 #define ARCH_HAS_USER_SINGLE_STEP_INFO
288
289 /*
290 * When hitting ptrace_stop(), we cannot return using SYSRET because
291 * that does not restore the full CPU state, only a minimal set. The
292 * ptracer can change arbitrary register values, which is usually okay
293 * because the usual ptrace stops run off the signal delivery path which
294 * forces IRET; however, ptrace_event() stops happen in arbitrary places
295 * in the kernel and don't force IRET path.
296 *
297 * So force IRET path after a ptrace stop.
298 */
299 #define arch_ptrace_stop_needed(code, info) \
300 ({ \
301 set_thread_flag(TIF_NOTIFY_RESUME); \
302 false; \
303 })
304
305 struct user_desc;
306 extern int do_get_thread_area(struct task_struct *p, int idx,
307 struct user_desc __user *info);
308 extern int do_set_thread_area(struct task_struct *p, int idx,
309 struct user_desc __user *info, int can_allocate);
310
311 #endif /* __KERNEL__ */
312
313 #endif /* !__ASSEMBLY__ */
314
315 #endif /* _ASM_X86_PTRACE_H */
316