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#include 

#include 

	unsigned long cx;

	unsigned long sp;

	unsigned long ss;

/* top of stack page */

};

#endif /* !__i386__ */

#ifdef CONFIG_PARAVIRT

#include 

#endif

struct cpuinfo_x86;

struct task_struct;

extern unsigned long profile_pc(struct pt_regs *regs);

#define profile_pc profile_pc

extern unsigned long

convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);

extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,

			 int error_code, int si_code);

extern unsigned long syscall_trace_enter_phase1(struct pt_regs *, u32 arch);

extern long syscall_trace_enter_phase2(struct pt_regs *, u32 arch,

				       unsigned long phase1_result);

extern long syscall_trace_enter(struct pt_regs *);

extern void syscall_trace_leave(struct pt_regs *);

static inline unsigned long regs_return_value(struct pt_regs *regs)

{

	return regs->ax;

}

/*

 * user_mode_vm(regs) determines whether a register set came from user mode.

 * This is true if V8086 mode was enabled OR if the register set was from

 * protected mode with RPL-3 CS value.  This tricky test checks that with

 * one comparison.  Many places in the kernel can bypass this full check

 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.

 */

static inline int user_mode(struct pt_regs *regs)

{

#ifdef CONFIG_X86_32

	return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;

#else

	return !!(regs->cs & 3);

#endif

}

static inline int user_mode_vm(struct pt_regs *regs)

{

#ifdef CONFIG_X86_32

	return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=

		USER_RPL;

#else

	return user_mode(regs);

#endif

}

static inline int v8086_mode(struct pt_regs *regs)

{

#ifdef CONFIG_X86_32

	return (regs->flags & X86_VM_MASK);

#else

	return 0;	/* No V86 mode support in long mode */

#endif

}

#ifdef CONFIG_X86_64

static inline bool user_64bit_mode(struct pt_regs *regs)

{

#ifndef CONFIG_PARAVIRT

	/*

	 * On non-paravirt systems, this is the only long mode CPL 3

	 * selector.  We do not allow long mode selectors in the LDT.

	 */

	return regs->cs == __USER_CS;

#else

	/* Headers are too twisted for this to go in paravirt.h. */

	return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;

#endif

}

#define current_user_stack_pointer()	this_cpu_read(old_rsp)

/* ia32 vs. x32 difference */

#define compat_user_stack_pointer()	\

	(test_thread_flag(TIF_IA32) 	\

	 ? current_pt_regs()->sp 	\

	 : this_cpu_read(old_rsp))

#endif

#ifdef CONFIG_X86_32

extern unsigned long kernel_stack_pointer(struct pt_regs *regs);

#else

static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)

{

	return regs->sp;

}

#endif

#define GET_IP(regs) ((regs)->ip)

#define GET_FP(regs) ((regs)->bp)

#define GET_USP(regs) ((regs)->sp)

#include 

/* Query offset/name of register from its name/offset */

extern int regs_query_register_offset(const char *name);

extern const char *regs_query_register_name(unsigned int offset);

#define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))

/**

 * regs_get_register() - get register value from its offset

 * @regs:	pt_regs from which register value is gotten.

 * @offset:	offset number of the register.

 *

 * regs_get_register returns the value of a register. The @offset is the

 * offset of the register in struct pt_regs address which specified by @regs.

 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.

 */

static inline unsigned long regs_get_register(struct pt_regs *regs,

					      unsigned int offset)

{

	if (unlikely(offset > MAX_REG_OFFSET))

		return 0;

#ifdef CONFIG_X86_32

	/*

	 * Traps from the kernel do not save sp and ss.

	 * Use the helper function to retrieve sp.

	 */

	if (offset == offsetof(struct pt_regs, sp) &&

	    regs->cs == __KERNEL_CS)

		return kernel_stack_pointer(regs);

#endif

	return *(unsigned long *)((unsigned long)regs + offset);

}

/**

 * regs_within_kernel_stack() - check the address in the stack

 * @regs:	pt_regs which contains kernel stack pointer.

 * @addr:	address which is checked.

 *

 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).

 * If @addr is within the kernel stack, it returns true. If not, returns false.

 */

static inline int regs_within_kernel_stack(struct pt_regs *regs,

					   unsigned long addr)

{

	return ((addr & ~(THREAD_SIZE - 1))  ==

		(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));

}

/**

 * regs_get_kernel_stack_nth() - get Nth entry of the stack

 * @regs:	pt_regs which contains kernel stack pointer.

 * @n:		stack entry number.

 *

 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which

 * is specified by @regs. If the @n th entry is NOT in the kernel stack,

 * this returns 0.

 */

static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,

						      unsigned int n)

{

	unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);

	addr += n;

	if (regs_within_kernel_stack(regs, (unsigned long)addr))

		return *addr;

	else

		return 0;

}

#define arch_has_single_step()	(1)

#ifdef CONFIG_X86_DEBUGCTLMSR

#define arch_has_block_step()	(1)

#else

#define arch_has_block_step()	(boot_cpu_data.x86 >= 6)

#endif

#define ARCH_HAS_USER_SINGLE_STEP_INFO

/*

 * When hitting ptrace_stop(), we cannot return using SYSRET because

 * that does not restore the full CPU state, only a minimal set.  The

 * ptracer can change arbitrary register values, which is usually okay

 * because the usual ptrace stops run off the signal delivery path which

 * forces IRET; however, ptrace_event() stops happen in arbitrary places

 * in the kernel and don't force IRET path.

 *

 * So force IRET path after a ptrace stop.

 */

#define arch_ptrace_stop_needed(code, info)				\

({									\

	set_thread_flag(TIF_NOTIFY_RESUME);				\