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>
11 /* this struct defines the way the registers are stored on the
12 stack during a system call. */
36 #else /* __KERNEL__ */
59 #include <asm/segment.h>
61 #endif /* __KERNEL__ */
74 /* arguments: non interrupts/non tracing syscalls only save upto here*/
84 unsigned long orig_rax;
85 /* end of arguments */
86 /* cpu exception frame or undefined */
92 /* top of stack page */
95 #else /* __KERNEL__ */
104 /* arguments: non interrupts/non tracing syscalls only save upto here*/
114 unsigned long orig_ax;
115 /* end of arguments */
116 /* cpu exception frame or undefined */
122 /* top of stack page */
125 #endif /* __KERNEL__ */
126 #endif /* !__i386__ */
130 /* the DS BTS struct is used for ptrace as well */
135 extern void ptrace_bts_take_timestamp(struct task_struct *, enum bts_qualifier);
137 extern unsigned long profile_pc(struct pt_regs *regs);
140 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
143 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code);
145 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
148 #define regs_return_value(regs) ((regs)->ax)
151 * user_mode_vm(regs) determines whether a register set came from user mode.
152 * This is true if V8086 mode was enabled OR if the register set was from
153 * protected mode with RPL-3 CS value. This tricky test checks that with
154 * one comparison. Many places in the kernel can bypass this full check
155 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
157 static inline int user_mode(struct pt_regs *regs)
160 return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
162 return !!(regs->cs & 3);
166 static inline int user_mode_vm(struct pt_regs *regs)
169 return ((regs->cs & SEGMENT_RPL_MASK) |
170 (regs->flags & VM_MASK)) >= USER_RPL;
172 return user_mode(regs);
176 static inline int v8086_mode(struct pt_regs *regs)
179 return (regs->flags & VM_MASK);
181 return 0; /* No V86 mode support in long mode */
186 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
187 * when it traps. So regs will be the current sp.
189 * This is valid only for kernel mode traps.
191 static inline unsigned long kernel_trap_sp(struct pt_regs *regs)
194 return (unsigned long)regs;
200 static inline unsigned long instruction_pointer(struct pt_regs *regs)
205 static inline unsigned long frame_pointer(struct pt_regs *regs)
211 * These are defined as per linux/ptrace.h, which see.
213 #define arch_has_single_step() (1)
214 extern void user_enable_single_step(struct task_struct *);
215 extern void user_disable_single_step(struct task_struct *);
217 extern void user_enable_block_step(struct task_struct *);
218 #ifdef CONFIG_X86_DEBUGCTLMSR
219 #define arch_has_block_step() (1)
221 #define arch_has_block_step() (boot_cpu_data.x86 >= 6)
225 extern int do_get_thread_area(struct task_struct *p, int idx,
226 struct user_desc __user *info);
227 extern int do_set_thread_area(struct task_struct *p, int idx,
228 struct user_desc __user *info, int can_allocate);
230 #endif /* __KERNEL__ */
232 #endif /* !__ASSEMBLY__ */