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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_PTRACE_H
3#define _ASM_X86_PTRACE_H
4
5#include <asm/segment.h>
6#include <asm/page_types.h>
7#include <uapi/asm/ptrace.h>
8
9#ifndef __ASSEMBLY__
10#ifdef __i386__
11
12struct pt_regs {
13 /*
14 * NB: 32-bit x86 CPUs are inconsistent as what happens in the
15 * following cases (where %seg represents a segment register):
16 *
17 * - pushl %seg: some do a 16-bit write and leave the high
18 * bits alone
19 * - movl %seg, [mem]: some do a 16-bit write despite the movl
20 * - IDT entry: some (e.g. 486) will leave the high bits of CS
21 * and (if applicable) SS undefined.
22 *
23 * Fortunately, x86-32 doesn't read the high bits on POP or IRET,
24 * so we can just treat all of the segment registers as 16-bit
25 * values.
26 */
27 unsigned long bx;
28 unsigned long cx;
29 unsigned long dx;
30 unsigned long si;
31 unsigned long di;
32 unsigned long bp;
33 unsigned long ax;
34 unsigned short ds;
35 unsigned short __dsh;
36 unsigned short es;
37 unsigned short __esh;
38 unsigned short fs;
39 unsigned short __fsh;
40 /* On interrupt, gs and __gsh store the vector number. */
41 unsigned short gs;
42 unsigned short __gsh;
43 /* On interrupt, this is the error code. */
44 unsigned long orig_ax;
45 unsigned long ip;
46 unsigned short cs;
47 unsigned short __csh;
48 unsigned long flags;
49 unsigned long sp;
50 unsigned short ss;
51 unsigned short __ssh;
52};
53
54#else /* __i386__ */
55
56struct pt_regs {
57/*
58 * C ABI says these regs are callee-preserved. They aren't saved on kernel entry
59 * unless syscall needs a complete, fully filled "struct pt_regs".
60 */
61 unsigned long r15;
62 unsigned long r14;
63 unsigned long r13;
64 unsigned long r12;
65 unsigned long bp;
66 unsigned long bx;
67/* These regs are callee-clobbered. Always saved on kernel entry. */
68 unsigned long r11;
69 unsigned long r10;
70 unsigned long r9;
71 unsigned long r8;
72 unsigned long ax;
73 unsigned long cx;
74 unsigned long dx;
75 unsigned long si;
76 unsigned long di;
77/*
78 * On syscall entry, this is syscall#. On CPU exception, this is error code.
79 * On hw interrupt, it's IRQ number:
80 */
81 unsigned long orig_ax;
82/* Return frame for iretq */
83 unsigned long ip;
84 unsigned long cs;
85 unsigned long flags;
86 unsigned long sp;
87 unsigned long ss;
88/* top of stack page */
89};
90
91#endif /* !__i386__ */
92
93#ifdef CONFIG_PARAVIRT
94#include <asm/paravirt_types.h>
95#endif
96
97struct cpuinfo_x86;
98struct task_struct;
99
100extern unsigned long profile_pc(struct pt_regs *regs);
101
102extern unsigned long
103convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
104extern void send_sigtrap(struct pt_regs *regs, int error_code, int si_code);
105
106
107static inline unsigned long regs_return_value(struct pt_regs *regs)
108{
109 return regs->ax;
110}
111
112static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
113{
114 regs->ax = rc;
115}
116
117/*
118 * user_mode(regs) determines whether a register set came from user
119 * mode. On x86_32, this is true if V8086 mode was enabled OR if the
120 * register set was from protected mode with RPL-3 CS value. This
121 * tricky test checks that with one comparison.
122 *
123 * On x86_64, vm86 mode is mercifully nonexistent, and we don't need
124 * the extra check.
125 */
126static __always_inline int user_mode(struct pt_regs *regs)
127{
128#ifdef CONFIG_X86_32
129 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= USER_RPL;
130#else
131 return !!(regs->cs & 3);
132#endif
133}
134
135static inline int v8086_mode(struct pt_regs *regs)
136{
137#ifdef CONFIG_X86_32
138 return (regs->flags & X86_VM_MASK);
139#else
140 return 0; /* No V86 mode support in long mode */
141#endif
142}
143
144static inline bool user_64bit_mode(struct pt_regs *regs)
145{
146#ifdef CONFIG_X86_64
147#ifndef CONFIG_PARAVIRT_XXL
148 /*
149 * On non-paravirt systems, this is the only long mode CPL 3
150 * selector. We do not allow long mode selectors in the LDT.
151 */
152 return regs->cs == __USER_CS;
153#else
154 /* Headers are too twisted for this to go in paravirt.h. */
155 return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
156#endif
157#else /* !CONFIG_X86_64 */
158 return false;
159#endif
160}
161
162/*
163 * Determine whether the register set came from any context that is running in
164 * 64-bit mode.
165 */
166static inline bool any_64bit_mode(struct pt_regs *regs)
167{
168#ifdef CONFIG_X86_64
169 return !user_mode(regs) || user_64bit_mode(regs);
170#else
171 return false;
172#endif
173}
174
175#ifdef CONFIG_X86_64
176#define current_user_stack_pointer() current_pt_regs()->sp
177#define compat_user_stack_pointer() current_pt_regs()->sp
178#endif
179
180static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
181{
182 return regs->sp;
183}
184
185static inline unsigned long instruction_pointer(struct pt_regs *regs)
186{
187 return regs->ip;
188}
189
190static inline void instruction_pointer_set(struct pt_regs *regs,
191 unsigned long val)
192{
193 regs->ip = val;
194}
195
196static inline unsigned long frame_pointer(struct pt_regs *regs)
197{
198 return regs->bp;
199}
200
201static inline unsigned long user_stack_pointer(struct pt_regs *regs)
202{
203 return regs->sp;
204}
205
206static inline void user_stack_pointer_set(struct pt_regs *regs,
207 unsigned long val)
208{
209 regs->sp = val;
210}
211
212static __always_inline bool regs_irqs_disabled(struct pt_regs *regs)
213{
214 return !(regs->flags & X86_EFLAGS_IF);
215}
216
217/* Query offset/name of register from its name/offset */
218extern int regs_query_register_offset(const char *name);
219extern const char *regs_query_register_name(unsigned int offset);
220#define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
221
222/**
223 * regs_get_register() - get register value from its offset
224 * @regs: pt_regs from which register value is gotten.
225 * @offset: offset number of the register.
226 *
227 * regs_get_register returns the value of a register. The @offset is the
228 * offset of the register in struct pt_regs address which specified by @regs.
229 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
230 */
231static inline unsigned long regs_get_register(struct pt_regs *regs,
232 unsigned int offset)
233{
234 if (unlikely(offset > MAX_REG_OFFSET))
235 return 0;
236#ifdef CONFIG_X86_32
237 /* The selector fields are 16-bit. */
238 if (offset == offsetof(struct pt_regs, cs) ||
239 offset == offsetof(struct pt_regs, ss) ||
240 offset == offsetof(struct pt_regs, ds) ||
241 offset == offsetof(struct pt_regs, es) ||
242 offset == offsetof(struct pt_regs, fs) ||
243 offset == offsetof(struct pt_regs, gs)) {
244 return *(u16 *)((unsigned long)regs + offset);
245
246 }
247#endif
248 return *(unsigned long *)((unsigned long)regs + offset);
249}
250
251/**
252 * regs_within_kernel_stack() - check the address in the stack
253 * @regs: pt_regs which contains kernel stack pointer.
254 * @addr: address which is checked.
255 *
256 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
257 * If @addr is within the kernel stack, it returns true. If not, returns false.
258 */
259static inline int regs_within_kernel_stack(struct pt_regs *regs,
260 unsigned long addr)
261{
262 return ((addr & ~(THREAD_SIZE - 1)) == (regs->sp & ~(THREAD_SIZE - 1)));
263}
264
265/**
266 * regs_get_kernel_stack_nth_addr() - get the address of the Nth entry on stack
267 * @regs: pt_regs which contains kernel stack pointer.
268 * @n: stack entry number.
269 *
270 * regs_get_kernel_stack_nth() returns the address of the @n th entry of the
271 * kernel stack which is specified by @regs. If the @n th entry is NOT in
272 * the kernel stack, this returns NULL.
273 */
274static inline unsigned long *regs_get_kernel_stack_nth_addr(struct pt_regs *regs, unsigned int n)
275{
276 unsigned long *addr = (unsigned long *)regs->sp;
277
278 addr += n;
279 if (regs_within_kernel_stack(regs, (unsigned long)addr))
280 return addr;
281 else
282 return NULL;
283}
284
285/* To avoid include hell, we can't include uaccess.h */
286extern long copy_from_kernel_nofault(void *dst, const void *src, size_t size);
287
288/**
289 * regs_get_kernel_stack_nth() - get Nth entry of the stack
290 * @regs: pt_regs which contains kernel stack pointer.
291 * @n: stack entry number.
292 *
293 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
294 * is specified by @regs. If the @n th entry is NOT in the kernel stack
295 * this returns 0.
296 */
297static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
298 unsigned int n)
299{
300 unsigned long *addr;
301 unsigned long val;
302 long ret;
303
304 addr = regs_get_kernel_stack_nth_addr(regs, n);
305 if (addr) {
306 ret = copy_from_kernel_nofault(&val, addr, sizeof(val));
307 if (!ret)
308 return val;
309 }
310 return 0;
311}
312
313/**
314 * regs_get_kernel_argument() - get Nth function argument in kernel
315 * @regs: pt_regs of that context
316 * @n: function argument number (start from 0)
317 *
318 * regs_get_argument() returns @n th argument of the function call.
319 * Note that this chooses most probably assignment, in some case
320 * it can be incorrect.
321 * This is expected to be called from kprobes or ftrace with regs
322 * where the top of stack is the return address.
323 */
324static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs,
325 unsigned int n)
326{
327 static const unsigned int argument_offs[] = {
328#ifdef __i386__
329 offsetof(struct pt_regs, ax),
330 offsetof(struct pt_regs, dx),
331 offsetof(struct pt_regs, cx),
332#define NR_REG_ARGUMENTS 3
333#else
334 offsetof(struct pt_regs, di),
335 offsetof(struct pt_regs, si),
336 offsetof(struct pt_regs, dx),
337 offsetof(struct pt_regs, cx),
338 offsetof(struct pt_regs, r8),
339 offsetof(struct pt_regs, r9),
340#define NR_REG_ARGUMENTS 6
341#endif
342 };
343
344 if (n >= NR_REG_ARGUMENTS) {
345 n -= NR_REG_ARGUMENTS - 1;
346 return regs_get_kernel_stack_nth(regs, n);
347 } else
348 return regs_get_register(regs, argument_offs[n]);
349}
350
351#define arch_has_single_step() (1)
352#ifdef CONFIG_X86_DEBUGCTLMSR
353#define arch_has_block_step() (1)
354#else
355#define arch_has_block_step() (boot_cpu_data.x86 >= 6)
356#endif
357
358#define ARCH_HAS_USER_SINGLE_STEP_REPORT
359
360struct user_desc;
361extern int do_get_thread_area(struct task_struct *p, int idx,
362 struct user_desc __user *info);
363extern int do_set_thread_area(struct task_struct *p, int idx,
364 struct user_desc __user *info, int can_allocate);
365
366#ifdef CONFIG_X86_64
367# define do_set_thread_area_64(p, s, t) do_arch_prctl_64(p, s, t)
368#else
369# define do_set_thread_area_64(p, s, t) (0)
370#endif
371
372#endif /* !__ASSEMBLY__ */
373#endif /* _ASM_X86_PTRACE_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_PTRACE_H
3#define _ASM_X86_PTRACE_H
4
5#include <asm/segment.h>
6#include <asm/page_types.h>
7#include <uapi/asm/ptrace.h>
8
9#ifndef __ASSEMBLY__
10#ifdef __i386__
11
12struct pt_regs {
13 /*
14 * NB: 32-bit x86 CPUs are inconsistent as what happens in the
15 * following cases (where %seg represents a segment register):
16 *
17 * - pushl %seg: some do a 16-bit write and leave the high
18 * bits alone
19 * - movl %seg, [mem]: some do a 16-bit write despite the movl
20 * - IDT entry: some (e.g. 486) will leave the high bits of CS
21 * and (if applicable) SS undefined.
22 *
23 * Fortunately, x86-32 doesn't read the high bits on POP or IRET,
24 * so we can just treat all of the segment registers as 16-bit
25 * values.
26 */
27 unsigned long bx;
28 unsigned long cx;
29 unsigned long dx;
30 unsigned long si;
31 unsigned long di;
32 unsigned long bp;
33 unsigned long ax;
34 unsigned short ds;
35 unsigned short __dsh;
36 unsigned short es;
37 unsigned short __esh;
38 unsigned short fs;
39 unsigned short __fsh;
40 /*
41 * On interrupt, gs and __gsh store the vector number. They never
42 * store gs any more.
43 */
44 unsigned short gs;
45 unsigned short __gsh;
46 /* On interrupt, this is the error code. */
47 unsigned long orig_ax;
48 unsigned long ip;
49 unsigned short cs;
50 unsigned short __csh;
51 unsigned long flags;
52 unsigned long sp;
53 unsigned short ss;
54 unsigned short __ssh;
55};
56
57#else /* __i386__ */
58
59struct pt_regs {
60/*
61 * C ABI says these regs are callee-preserved. They aren't saved on kernel entry
62 * unless syscall needs a complete, fully filled "struct pt_regs".
63 */
64 unsigned long r15;
65 unsigned long r14;
66 unsigned long r13;
67 unsigned long r12;
68 unsigned long bp;
69 unsigned long bx;
70/* These regs are callee-clobbered. Always saved on kernel entry. */
71 unsigned long r11;
72 unsigned long r10;
73 unsigned long r9;
74 unsigned long r8;
75 unsigned long ax;
76 unsigned long cx;
77 unsigned long dx;
78 unsigned long si;
79 unsigned long di;
80/*
81 * On syscall entry, this is syscall#. On CPU exception, this is error code.
82 * On hw interrupt, it's IRQ number:
83 */
84 unsigned long orig_ax;
85/* Return frame for iretq */
86 unsigned long ip;
87 unsigned long cs;
88 unsigned long flags;
89 unsigned long sp;
90 unsigned long ss;
91/* top of stack page */
92};
93
94#endif /* !__i386__ */
95
96#ifdef CONFIG_PARAVIRT
97#include <asm/paravirt_types.h>
98#endif
99
100#include <asm/proto.h>
101
102struct cpuinfo_x86;
103struct task_struct;
104
105extern unsigned long profile_pc(struct pt_regs *regs);
106
107extern unsigned long
108convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
109extern void send_sigtrap(struct pt_regs *regs, int error_code, int si_code);
110
111
112static inline unsigned long regs_return_value(struct pt_regs *regs)
113{
114 return regs->ax;
115}
116
117static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
118{
119 regs->ax = rc;
120}
121
122/*
123 * user_mode(regs) determines whether a register set came from user
124 * mode. On x86_32, this is true if V8086 mode was enabled OR if the
125 * register set was from protected mode with RPL-3 CS value. This
126 * tricky test checks that with one comparison.
127 *
128 * On x86_64, vm86 mode is mercifully nonexistent, and we don't need
129 * the extra check.
130 */
131static __always_inline int user_mode(struct pt_regs *regs)
132{
133#ifdef CONFIG_X86_32
134 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= USER_RPL;
135#else
136 return !!(regs->cs & 3);
137#endif
138}
139
140static inline int v8086_mode(struct pt_regs *regs)
141{
142#ifdef CONFIG_X86_32
143 return (regs->flags & X86_VM_MASK);
144#else
145 return 0; /* No V86 mode support in long mode */
146#endif
147}
148
149static inline bool user_64bit_mode(struct pt_regs *regs)
150{
151#ifdef CONFIG_X86_64
152#ifndef CONFIG_PARAVIRT_XXL
153 /*
154 * On non-paravirt systems, this is the only long mode CPL 3
155 * selector. We do not allow long mode selectors in the LDT.
156 */
157 return regs->cs == __USER_CS;
158#else
159 /* Headers are too twisted for this to go in paravirt.h. */
160 return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
161#endif
162#else /* !CONFIG_X86_64 */
163 return false;
164#endif
165}
166
167/*
168 * Determine whether the register set came from any context that is running in
169 * 64-bit mode.
170 */
171static inline bool any_64bit_mode(struct pt_regs *regs)
172{
173#ifdef CONFIG_X86_64
174 return !user_mode(regs) || user_64bit_mode(regs);
175#else
176 return false;
177#endif
178}
179
180#ifdef CONFIG_X86_64
181#define current_user_stack_pointer() current_pt_regs()->sp
182#define compat_user_stack_pointer() current_pt_regs()->sp
183
184static inline bool ip_within_syscall_gap(struct pt_regs *regs)
185{
186 bool ret = (regs->ip >= (unsigned long)entry_SYSCALL_64 &&
187 regs->ip < (unsigned long)entry_SYSCALL_64_safe_stack);
188
189#ifdef CONFIG_IA32_EMULATION
190 ret = ret || (regs->ip >= (unsigned long)entry_SYSCALL_compat &&
191 regs->ip < (unsigned long)entry_SYSCALL_compat_safe_stack);
192#endif
193
194 return ret;
195}
196#endif
197
198static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
199{
200 return regs->sp;
201}
202
203static inline unsigned long instruction_pointer(struct pt_regs *regs)
204{
205 return regs->ip;
206}
207
208static inline void instruction_pointer_set(struct pt_regs *regs,
209 unsigned long val)
210{
211 regs->ip = val;
212}
213
214static inline unsigned long frame_pointer(struct pt_regs *regs)
215{
216 return regs->bp;
217}
218
219static inline unsigned long user_stack_pointer(struct pt_regs *regs)
220{
221 return regs->sp;
222}
223
224static inline void user_stack_pointer_set(struct pt_regs *regs,
225 unsigned long val)
226{
227 regs->sp = val;
228}
229
230static __always_inline bool regs_irqs_disabled(struct pt_regs *regs)
231{
232 return !(regs->flags & X86_EFLAGS_IF);
233}
234
235/* Query offset/name of register from its name/offset */
236extern int regs_query_register_offset(const char *name);
237extern const char *regs_query_register_name(unsigned int offset);
238#define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
239
240/**
241 * regs_get_register() - get register value from its offset
242 * @regs: pt_regs from which register value is gotten.
243 * @offset: offset number of the register.
244 *
245 * regs_get_register returns the value of a register. The @offset is the
246 * offset of the register in struct pt_regs address which specified by @regs.
247 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
248 */
249static inline unsigned long regs_get_register(struct pt_regs *regs,
250 unsigned int offset)
251{
252 if (unlikely(offset > MAX_REG_OFFSET))
253 return 0;
254#ifdef CONFIG_X86_32
255 /* The selector fields are 16-bit. */
256 if (offset == offsetof(struct pt_regs, cs) ||
257 offset == offsetof(struct pt_regs, ss) ||
258 offset == offsetof(struct pt_regs, ds) ||
259 offset == offsetof(struct pt_regs, es) ||
260 offset == offsetof(struct pt_regs, fs) ||
261 offset == offsetof(struct pt_regs, gs)) {
262 return *(u16 *)((unsigned long)regs + offset);
263
264 }
265#endif
266 return *(unsigned long *)((unsigned long)regs + offset);
267}
268
269/**
270 * regs_within_kernel_stack() - check the address in the stack
271 * @regs: pt_regs which contains kernel stack pointer.
272 * @addr: address which is checked.
273 *
274 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
275 * If @addr is within the kernel stack, it returns true. If not, returns false.
276 */
277static inline int regs_within_kernel_stack(struct pt_regs *regs,
278 unsigned long addr)
279{
280 return ((addr & ~(THREAD_SIZE - 1)) == (regs->sp & ~(THREAD_SIZE - 1)));
281}
282
283/**
284 * regs_get_kernel_stack_nth_addr() - get the address of the Nth entry on stack
285 * @regs: pt_regs which contains kernel stack pointer.
286 * @n: stack entry number.
287 *
288 * regs_get_kernel_stack_nth() returns the address of the @n th entry of the
289 * kernel stack which is specified by @regs. If the @n th entry is NOT in
290 * the kernel stack, this returns NULL.
291 */
292static inline unsigned long *regs_get_kernel_stack_nth_addr(struct pt_regs *regs, unsigned int n)
293{
294 unsigned long *addr = (unsigned long *)regs->sp;
295
296 addr += n;
297 if (regs_within_kernel_stack(regs, (unsigned long)addr))
298 return addr;
299 else
300 return NULL;
301}
302
303/* To avoid include hell, we can't include uaccess.h */
304extern long copy_from_kernel_nofault(void *dst, const void *src, size_t size);
305
306/**
307 * regs_get_kernel_stack_nth() - get Nth entry of the stack
308 * @regs: pt_regs which contains kernel stack pointer.
309 * @n: stack entry number.
310 *
311 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
312 * is specified by @regs. If the @n th entry is NOT in the kernel stack
313 * this returns 0.
314 */
315static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
316 unsigned int n)
317{
318 unsigned long *addr;
319 unsigned long val;
320 long ret;
321
322 addr = regs_get_kernel_stack_nth_addr(regs, n);
323 if (addr) {
324 ret = copy_from_kernel_nofault(&val, addr, sizeof(val));
325 if (!ret)
326 return val;
327 }
328 return 0;
329}
330
331/**
332 * regs_get_kernel_argument() - get Nth function argument in kernel
333 * @regs: pt_regs of that context
334 * @n: function argument number (start from 0)
335 *
336 * regs_get_argument() returns @n th argument of the function call.
337 * Note that this chooses most probably assignment, in some case
338 * it can be incorrect.
339 * This is expected to be called from kprobes or ftrace with regs
340 * where the top of stack is the return address.
341 */
342static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs,
343 unsigned int n)
344{
345 static const unsigned int argument_offs[] = {
346#ifdef __i386__
347 offsetof(struct pt_regs, ax),
348 offsetof(struct pt_regs, dx),
349 offsetof(struct pt_regs, cx),
350#define NR_REG_ARGUMENTS 3
351#else
352 offsetof(struct pt_regs, di),
353 offsetof(struct pt_regs, si),
354 offsetof(struct pt_regs, dx),
355 offsetof(struct pt_regs, cx),
356 offsetof(struct pt_regs, r8),
357 offsetof(struct pt_regs, r9),
358#define NR_REG_ARGUMENTS 6
359#endif
360 };
361
362 if (n >= NR_REG_ARGUMENTS) {
363 n -= NR_REG_ARGUMENTS - 1;
364 return regs_get_kernel_stack_nth(regs, n);
365 } else
366 return regs_get_register(regs, argument_offs[n]);
367}
368
369#define arch_has_single_step() (1)
370#ifdef CONFIG_X86_DEBUGCTLMSR
371#define arch_has_block_step() (1)
372#else
373#define arch_has_block_step() (boot_cpu_data.x86 >= 6)
374#endif
375
376#define ARCH_HAS_USER_SINGLE_STEP_REPORT
377
378struct user_desc;
379extern int do_get_thread_area(struct task_struct *p, int idx,
380 struct user_desc __user *info);
381extern int do_set_thread_area(struct task_struct *p, int idx,
382 struct user_desc __user *info, int can_allocate);
383
384#ifdef CONFIG_X86_64
385# define do_set_thread_area_64(p, s, t) do_arch_prctl_64(p, s, t)
386#else
387# define do_set_thread_area_64(p, s, t) (0)
388#endif
389
390#endif /* !__ASSEMBLY__ */
391#endif /* _ASM_X86_PTRACE_H */