1 #ifndef _ASM_X86_PTRACE_H
2 #define _ASM_X86_PTRACE_H
4 #include <linux/compiler.h> /* For __user */
5 #include <asm/ptrace-abi.h>
6 #include <asm/processor-flags.h>
9 #include <asm/segment.h>
10 #include <asm/page_types.h>
16 /* this struct defines the way the registers are stored on the
17 stack during a system call. */
41 #else /* __KERNEL__ */
55 unsigned long orig_ax
;
63 #endif /* __KERNEL__ */
76 /* arguments: non interrupts/non tracing syscalls only save up to here*/
86 unsigned long orig_rax
;
87 /* end of arguments */
88 /* cpu exception frame or undefined */
94 /* top of stack page */
97 #else /* __KERNEL__ */
106 /* arguments: non interrupts/non tracing syscalls only save up to here*/
116 unsigned long orig_ax
;
117 /* end of arguments */
118 /* cpu exception frame or undefined */
124 /* top of stack page */
127 #endif /* __KERNEL__ */
128 #endif /* !__i386__ */
133 #include <linux/init.h>
134 #ifdef CONFIG_PARAVIRT
135 #include <asm/paravirt_types.h>
141 extern unsigned long profile_pc(struct pt_regs
*regs
);
142 #define profile_pc profile_pc
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
);
149 extern long syscall_trace_enter(struct pt_regs
*);
150 extern void syscall_trace_leave(struct pt_regs
*);
152 static inline unsigned long regs_return_value(struct pt_regs
*regs
)
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.
164 static inline int user_mode(struct pt_regs
*regs
)
167 return (regs
->cs
& SEGMENT_RPL_MASK
) == USER_RPL
;
169 return !!(regs
->cs
& 3);
173 static inline int user_mode_vm(struct pt_regs
*regs
)
176 return ((regs
->cs
& SEGMENT_RPL_MASK
) | (regs
->flags
& X86_VM_MASK
)) >=
179 return user_mode(regs
);
183 static inline int v8086_mode(struct pt_regs
*regs
)
186 return (regs
->flags
& X86_VM_MASK
);
188 return 0; /* No V86 mode support in long mode */
193 static inline bool user_64bit_mode(struct pt_regs
*regs
)
195 #ifndef CONFIG_PARAVIRT
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.
200 return regs
->cs
== __USER_CS
;
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
;
209 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
210 * when it traps. The previous stack will be directly underneath the saved
211 * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'.
213 * This is valid only for kernel mode traps.
215 static inline unsigned long kernel_stack_pointer(struct pt_regs
*regs
)
218 return (unsigned long)(®s
->sp
);
224 #define GET_IP(regs) ((regs)->ip)
225 #define GET_FP(regs) ((regs)->bp)
226 #define GET_USP(regs) ((regs)->sp)
228 #include <asm-generic/ptrace.h>
230 /* Query offset/name of register from its name/offset */
231 extern int regs_query_register_offset(const char *name
);
232 extern const char *regs_query_register_name(unsigned int offset
);
233 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
236 * regs_get_register() - get register value from its offset
237 * @regs: pt_regs from which register value is gotten.
238 * @offset: offset number of the register.
240 * regs_get_register returns the value of a register. The @offset is the
241 * offset of the register in struct pt_regs address which specified by @regs.
242 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
244 static inline unsigned long regs_get_register(struct pt_regs
*regs
,
247 if (unlikely(offset
> MAX_REG_OFFSET
))
249 return *(unsigned long *)((unsigned long)regs
+ offset
);
253 * regs_within_kernel_stack() - check the address in the stack
254 * @regs: pt_regs which contains kernel stack pointer.
255 * @addr: address which is checked.
257 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
258 * If @addr is within the kernel stack, it returns true. If not, returns false.
260 static inline int regs_within_kernel_stack(struct pt_regs
*regs
,
263 return ((addr
& ~(THREAD_SIZE
- 1)) ==
264 (kernel_stack_pointer(regs
) & ~(THREAD_SIZE
- 1)));
268 * regs_get_kernel_stack_nth() - get Nth entry of the stack
269 * @regs: pt_regs which contains kernel stack pointer.
270 * @n: stack entry number.
272 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
273 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
276 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs
*regs
,
279 unsigned long *addr
= (unsigned long *)kernel_stack_pointer(regs
);
281 if (regs_within_kernel_stack(regs
, (unsigned long)addr
))
287 #define arch_has_single_step() (1)
288 #ifdef CONFIG_X86_DEBUGCTLMSR
289 #define arch_has_block_step() (1)
291 #define arch_has_block_step() (boot_cpu_data.x86 >= 6)
294 #define ARCH_HAS_USER_SINGLE_STEP_INFO
297 extern int do_get_thread_area(struct task_struct
*p
, int idx
,
298 struct user_desc __user
*info
);
299 extern int do_set_thread_area(struct task_struct
*p
, int idx
,
300 struct user_desc __user
*info
, int can_allocate
);
302 #endif /* __KERNEL__ */
304 #endif /* !__ASSEMBLY__ */
306 #endif /* _ASM_X86_PTRACE_H */
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