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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 */
#ifndef _ASM_PTRACE_H
#define _ASM_PTRACE_H


#include <linux/compiler.h>
#include <linux/linkage.h>
#include <linux/types.h>
#include <asm/isadep.h>
#include <asm/page.h>
#include <asm/thread_info.h>
#include <uapi/asm/ptrace.h>

/*
 * This struct defines the way the registers are stored on the stack during a
 * system call/exception. As usual the registers k0/k1 aren't being saved.
 *
 * If you add a register here, also add it to regoffset_table[] in
 * arch/mips/kernel/ptrace.c.
 */
struct pt_regs {
#ifdef CONFIG_32BIT
	/* Pad bytes for argument save space on the stack. */
	unsigned long pad0[8];
#endif

	/* Saved main processor registers. */
	unsigned long regs[32];

	/* Saved special registers. */
	unsigned long cp0_status;
	unsigned long hi;
	unsigned long lo;
#ifdef CONFIG_CPU_HAS_SMARTMIPS
	unsigned long acx;
#endif
	unsigned long cp0_badvaddr;
	unsigned long cp0_cause;
	unsigned long cp0_epc;
#ifdef CONFIG_CPU_CAVIUM_OCTEON
	unsigned long long mpl[6];        /* MTM{0-5} */
	unsigned long long mtp[6];        /* MTP{0-5} */
#endif
	unsigned long __last[0];
} __aligned(8);

static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
{
	return regs->regs[31];
}

/*
 * Don't use asm-generic/ptrace.h it defines FP accessors that don't make
 * sense on MIPS.  We rather want an error if they get invoked.
 */

static inline void instruction_pointer_set(struct pt_regs *regs,
                                           unsigned long val)
{
	regs->cp0_epc = val;
}

/* Query offset/name of register from its name/offset */
extern int regs_query_register_offset(const char *name);
#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))

/**
 * 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;

	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;
}

struct task_struct;

extern int ptrace_getregs(struct task_struct *child,
	struct user_pt_regs __user *data);
extern int ptrace_setregs(struct task_struct *child,
	struct user_pt_regs __user *data);

extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);

extern int ptrace_get_watch_regs(struct task_struct *child,
	struct pt_watch_regs __user *addr);
extern int ptrace_set_watch_regs(struct task_struct *child,
	struct pt_watch_regs __user *addr);

/*
 * Does the process account for user or for system time?
 */
#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)

static inline int is_syscall_success(struct pt_regs *regs)
{
	return !regs->regs[7];
}

static inline long regs_return_value(struct pt_regs *regs)
{
	if (is_syscall_success(regs) || !user_mode(regs))
		return regs->regs[2];
	else
		return -regs->regs[2];
}

#define instruction_pointer(regs) ((regs)->cp0_epc)
#define profile_pc(regs) instruction_pointer(regs)

extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);

extern void die(const char *, struct pt_regs *) __noreturn;

static inline void die_if_kernel(const char *str, struct pt_regs *regs)
{
	if (unlikely(!user_mode(regs)))
		die(str, regs);
}

#define current_pt_regs()						\
({									\
	unsigned long sp = (unsigned long)__builtin_frame_address(0);	\
	(struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1;	\
})

/* Helpers for working with the user stack pointer */

static inline unsigned long user_stack_pointer(struct pt_regs *regs)
{
	return regs->regs[29];
}

static inline void user_stack_pointer_set(struct pt_regs *regs,
	unsigned long val)
{
	regs->regs[29] = val;
}

#endif /* _ASM_PTRACE_H */

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asm-offsets.h File 35 B 0644
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asm.h File 8.47 KB 0644
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processor.h File 11.71 KB 0644
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serial.h File 607 B 0644
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signal.h File 1.02 KB 0644
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