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>
10 #include <asm/page_types.h>
16 /* this struct defines the way the registers are stored on the
17 stack during a system call. */
41 #else /* __KERNEL__ */
55 unsigned long orig_ax;
63 #endif /* __KERNEL__ */
76 /* arguments: non interrupts/non tracing syscalls only save up to here*/
86 unsigned long orig_rax;
87 /* end of arguments */
88 /* cpu exception frame or undefined */
94 /* top of stack page */
97 #else /* __KERNEL__ */
106 /* arguments: non interrupts/non tracing syscalls only save up to here*/
116 unsigned long orig_ax;
117 /* end of arguments */
118 /* cpu exception frame or undefined */
124 /* top of stack page */
127 #endif /* __KERNEL__ */
128 #endif /* !__i386__ */
133 #include <linux/init.h>
138 extern unsigned long profile_pc(struct pt_regs *regs);
139 #define profile_pc profile_pc
142 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,
144 int error_code, int si_code);
145 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
147 extern long syscall_trace_enter(struct pt_regs *);
148 extern void syscall_trace_leave(struct pt_regs *);
150 static inline unsigned long regs_return_value(struct pt_regs *regs)
156 * user_mode_vm(regs) determines whether a register set came from user mode.
157 * This is true if V8086 mode was enabled OR if the register set was from
158 * protected mode with RPL-3 CS value. This tricky test checks that with
159 * one comparison. Many places in the kernel can bypass this full check
160 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
162 static inline int user_mode(struct pt_regs *regs)
165 return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
167 return !!(regs->cs & 3);
171 static inline int user_mode_vm(struct pt_regs *regs)
174 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
177 return user_mode(regs);
181 static inline int v8086_mode(struct pt_regs *regs)
184 return (regs->flags & X86_VM_MASK);
186 return 0; /* No V86 mode support in long mode */
191 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
192 * when it traps. The previous stack will be directly underneath the saved
193 * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'.
195 * This is valid only for kernel mode traps.
197 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
200 return (unsigned long)(®s->sp);
206 #define GET_IP(regs) ((regs)->ip)
207 #define GET_FP(regs) ((regs)->bp)
208 #define GET_USP(regs) ((regs)->sp)
210 #include <asm-generic/ptrace.h>
212 /* Query offset/name of register from its name/offset */
213 extern int regs_query_register_offset(const char *name);
214 extern const char *regs_query_register_name(unsigned int offset);
215 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
218 * regs_get_register() - get register value from its offset
219 * @regs: pt_regs from which register value is gotten.
220 * @offset: offset number of the register.
222 * regs_get_register returns the value of a register. The @offset is the
223 * offset of the register in struct pt_regs address which specified by @regs.
224 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
226 static inline unsigned long regs_get_register(struct pt_regs *regs,
229 if (unlikely(offset > MAX_REG_OFFSET))
231 return *(unsigned long *)((unsigned long)regs + offset);
235 * regs_within_kernel_stack() - check the address in the stack
236 * @regs: pt_regs which contains kernel stack pointer.
237 * @addr: address which is checked.
239 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
240 * If @addr is within the kernel stack, it returns true. If not, returns false.
242 static inline int regs_within_kernel_stack(struct pt_regs *regs,
245 return ((addr & ~(THREAD_SIZE - 1)) ==
246 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
250 * regs_get_kernel_stack_nth() - get Nth entry of the stack
251 * @regs: pt_regs which contains kernel stack pointer.
252 * @n: stack entry number.
254 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
255 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
258 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
261 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
263 if (regs_within_kernel_stack(regs, (unsigned long)addr))
269 #define arch_has_single_step() (1)
270 #ifdef CONFIG_X86_DEBUGCTLMSR
271 #define arch_has_block_step() (1)
273 #define arch_has_block_step() (boot_cpu_data.x86 >= 6)
276 #define ARCH_HAS_USER_SINGLE_STEP_INFO
279 extern int do_get_thread_area(struct task_struct *p, int idx,
280 struct user_desc __user *info);
281 extern int do_set_thread_area(struct task_struct *p, int idx,
282 struct user_desc __user *info, int can_allocate);
284 #endif /* __KERNEL__ */
286 #endif /* !__ASSEMBLY__ */
288 #endif /* _ASM_X86_PTRACE_H */