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/ds.h> /* the DS BTS struct is used for ptrace too */
10 #include <asm/segment.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 upto 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 upto 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__ */
132 /* the DS BTS struct is used for ptrace as well */
137 extern void ptrace_bts_take_timestamp(struct task_struct
*, enum bts_qualifier
);
139 extern unsigned long profile_pc(struct pt_regs
*regs
);
142 convert_ip_to_linear(struct task_struct
*child
, struct pt_regs
*regs
);
145 extern void send_sigtrap(struct task_struct
*tsk
, struct pt_regs
*regs
,
148 void signal_fault(struct pt_regs
*regs
, void __user
*frame
, char *where
);
151 extern long syscall_trace_enter(struct pt_regs
*);
152 extern void syscall_trace_leave(struct pt_regs
*);
154 static inline unsigned long regs_return_value(struct pt_regs
*regs
)
160 * user_mode_vm(regs) determines whether a register set came from user mode.
161 * This is true if V8086 mode was enabled OR if the register set was from
162 * protected mode with RPL-3 CS value. This tricky test checks that with
163 * one comparison. Many places in the kernel can bypass this full check
164 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
166 static inline int user_mode(struct pt_regs
*regs
)
169 return (regs
->cs
& SEGMENT_RPL_MASK
) == USER_RPL
;
171 return !!(regs
->cs
& 3);
175 static inline int user_mode_vm(struct pt_regs
*regs
)
178 return ((regs
->cs
& SEGMENT_RPL_MASK
) | (regs
->flags
& X86_VM_MASK
)) >=
181 return user_mode(regs
);
185 static inline int v8086_mode(struct pt_regs
*regs
)
188 return (regs
->flags
& X86_VM_MASK
);
190 return 0; /* No V86 mode support in long mode */
195 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
196 * when it traps. So regs will be the current sp.
198 * This is valid only for kernel mode traps.
200 static inline unsigned long kernel_trap_sp(struct pt_regs
*regs
)
203 return (unsigned long)regs
;
209 static inline unsigned long instruction_pointer(struct pt_regs
*regs
)
214 static inline unsigned long frame_pointer(struct pt_regs
*regs
)
220 * These are defined as per linux/ptrace.h, which see.
222 #define arch_has_single_step() (1)
223 extern void user_enable_single_step(struct task_struct
*);
224 extern void user_disable_single_step(struct task_struct
*);
226 extern void user_enable_block_step(struct task_struct
*);
227 #ifdef CONFIG_X86_DEBUGCTLMSR
228 #define arch_has_block_step() (1)
230 #define arch_has_block_step() (boot_cpu_data.x86 >= 6)
234 extern int do_get_thread_area(struct task_struct
*p
, int idx
,
235 struct user_desc __user
*info
);
236 extern int do_set_thread_area(struct task_struct
*p
, int idx
,
237 struct user_desc __user
*info
, int can_allocate
);
239 #define __ARCH_WANT_COMPAT_SYS_PTRACE
241 #endif /* __KERNEL__ */
243 #endif /* !__ASSEMBLY__ */