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>
15 /* this struct defines the way the registers are stored on the
16 stack during a system call. */
40 #else /* __KERNEL__ */
54 unsigned long orig_ax;
62 #endif /* __KERNEL__ */
75 /* arguments: non interrupts/non tracing syscalls only save upto here*/
85 unsigned long orig_rax;
86 /* end of arguments */
87 /* cpu exception frame or undefined */
93 /* top of stack page */
96 #else /* __KERNEL__ */
105 /* arguments: non interrupts/non tracing syscalls only save upto here*/
115 unsigned long orig_ax;
116 /* end of arguments */
117 /* cpu exception frame or undefined */
123 /* top of stack page */
126 #endif /* __KERNEL__ */
127 #endif /* !__i386__ */
132 #include <linux/init.h>
137 extern unsigned long profile_pc(struct pt_regs *regs);
140 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
141 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
142 int error_code, int si_code);
143 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
145 extern long syscall_trace_enter(struct pt_regs *);
146 extern void syscall_trace_leave(struct pt_regs *);
148 static inline unsigned long regs_return_value(struct pt_regs *regs)
154 * user_mode_vm(regs) determines whether a register set came from user mode.
155 * This is true if V8086 mode was enabled OR if the register set was from
156 * protected mode with RPL-3 CS value. This tricky test checks that with
157 * one comparison. Many places in the kernel can bypass this full check
158 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
160 static inline int user_mode(struct pt_regs *regs)
163 return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
165 return !!(regs->cs & 3);
169 static inline int user_mode_vm(struct pt_regs *regs)
172 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
175 return user_mode(regs);
179 static inline int v8086_mode(struct pt_regs *regs)
182 return (regs->flags & X86_VM_MASK);
184 return 0; /* No V86 mode support in long mode */
189 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
190 * when it traps. The previous stack will be directly underneath the saved
191 * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'.
193 * This is valid only for kernel mode traps.
195 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
198 return (unsigned long)(®s->sp);
204 static inline unsigned long instruction_pointer(struct pt_regs *regs)
209 static inline unsigned long frame_pointer(struct pt_regs *regs)
214 static inline unsigned long user_stack_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 extern void x86_ptrace_untrace(struct task_struct *);
240 extern void x86_ptrace_fork(struct task_struct *child,
241 unsigned long clone_flags);
243 #define arch_ptrace_untrace(tsk) x86_ptrace_untrace(tsk)
244 #define arch_ptrace_fork(child, flags) x86_ptrace_fork(child, flags)
246 #endif /* __KERNEL__ */
248 #endif /* !__ASSEMBLY__ */
250 #endif /* _ASM_X86_PTRACE_H */