190 lines
5.4 KiB
C
190 lines
5.4 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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*/
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#ifndef _ASM_PTRACE_H
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#define _ASM_PTRACE_H
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <linux/types.h>
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#include <asm/isadep.h>
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#include <asm/page.h>
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#include <asm/thread_info.h>
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#include <uapi/asm/ptrace.h>
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/*
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* This struct defines the way the registers are stored on the stack during a
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* system call/exception. As usual the registers k0/k1 aren't being saved.
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*
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* If you add a register here, also add it to regoffset_table[] in
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* arch/mips/kernel/ptrace.c.
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*/
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struct pt_regs {
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#ifdef CONFIG_32BIT
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/* Pad bytes for argument save space on the stack. */
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unsigned long pad0[8];
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#endif
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/* Saved main processor registers. */
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unsigned long regs[32];
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/* Saved special registers. */
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unsigned long cp0_status;
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unsigned long hi;
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unsigned long lo;
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#ifdef CONFIG_CPU_HAS_SMARTMIPS
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unsigned long acx;
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#endif
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unsigned long cp0_badvaddr;
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unsigned long cp0_cause;
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unsigned long cp0_epc;
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#ifdef CONFIG_CPU_CAVIUM_OCTEON
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unsigned long long mpl[6]; /* MTM{0-5} */
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unsigned long long mtp[6]; /* MTP{0-5} */
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#endif
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unsigned long __last[0];
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} __aligned(8);
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static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
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{
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return regs->regs[29];
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}
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static inline void instruction_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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regs->cp0_epc = val;
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}
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/* Query offset/name of register from its name/offset */
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extern int regs_query_register_offset(const char *name);
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#define MAX_REG_OFFSET (offsetof(struct pt_regs, __last))
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/**
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* regs_get_register() - get register value from its offset
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* @regs: pt_regs from which register value is gotten.
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* @offset: offset number of the register.
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*
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* regs_get_register returns the value of a register. The @offset is the
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* offset of the register in struct pt_regs address which specified by @regs.
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* If @offset is bigger than MAX_REG_OFFSET, this returns 0.
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*/
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static inline unsigned long regs_get_register(struct pt_regs *regs,
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unsigned int offset)
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{
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if (unlikely(offset > MAX_REG_OFFSET))
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return 0;
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return *(unsigned long *)((unsigned long)regs + offset);
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}
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/**
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* regs_within_kernel_stack() - check the address in the stack
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* @regs: pt_regs which contains kernel stack pointer.
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* @addr: address which is checked.
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*
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* regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
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* If @addr is within the kernel stack, it returns true. If not, returns false.
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*/
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static inline int regs_within_kernel_stack(struct pt_regs *regs,
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unsigned long addr)
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{
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return ((addr & ~(THREAD_SIZE - 1)) ==
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(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
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}
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/**
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* regs_get_kernel_stack_nth() - get Nth entry of the stack
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* @regs: pt_regs which contains kernel stack pointer.
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* @n: stack entry number.
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*
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* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
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* is specified by @regs. If the @n th entry is NOT in the kernel stack,
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* this returns 0.
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*/
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static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
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unsigned int n)
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{
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unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
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addr += n;
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if (regs_within_kernel_stack(regs, (unsigned long)addr))
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return *addr;
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else
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return 0;
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}
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struct task_struct;
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extern int ptrace_getregs(struct task_struct *child,
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struct user_pt_regs __user *data);
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extern int ptrace_setregs(struct task_struct *child,
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struct user_pt_regs __user *data);
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extern int ptrace_getfpregs(struct task_struct *child, __u32 __user *data);
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extern int ptrace_setfpregs(struct task_struct *child, __u32 __user *data);
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extern int ptrace_get_watch_regs(struct task_struct *child,
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struct pt_watch_regs __user *addr);
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extern int ptrace_set_watch_regs(struct task_struct *child,
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struct pt_watch_regs __user *addr);
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/*
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* Does the process account for user or for system time?
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*/
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#define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
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static inline int is_syscall_success(struct pt_regs *regs)
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{
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return !regs->regs[7];
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}
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static inline long regs_return_value(struct pt_regs *regs)
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{
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if (is_syscall_success(regs) || !user_mode(regs))
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return regs->regs[2];
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else
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return -regs->regs[2];
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}
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#define instruction_pointer(regs) ((regs)->cp0_epc)
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#define profile_pc(regs) instruction_pointer(regs)
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extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
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extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
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extern void die(const char *, struct pt_regs *) __noreturn;
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static inline void die_if_kernel(const char *str, struct pt_regs *regs)
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{
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if (unlikely(!user_mode(regs)))
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die(str, regs);
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}
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#define current_pt_regs() \
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({ \
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unsigned long sp = (unsigned long)__builtin_frame_address(0); \
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(struct pt_regs *)((sp | (THREAD_SIZE - 1)) + 1 - 32) - 1; \
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})
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/* Helpers for working with the user stack pointer */
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static inline unsigned long user_stack_pointer(struct pt_regs *regs)
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{
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return regs->regs[29];
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}
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static inline void user_stack_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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regs->regs[29] = val;
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}
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#endif /* _ASM_PTRACE_H */
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