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>
134 #ifdef CONFIG_PARAVIRT
135 #include <asm/paravirt_types.h>
136 #elif defined(CONFIG_X86_64_XEN)
137 #include <xen/interface/xen.h>
143 extern unsigned long profile_pc(struct pt_regs *regs);
144 #define profile_pc profile_pc
147 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
148 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
149 int error_code, int si_code);
150 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
152 extern long syscall_trace_enter(struct pt_regs *);
153 extern void syscall_trace_leave(struct pt_regs *);
155 static inline unsigned long regs_return_value(struct pt_regs *regs)
161 * user_mode_vm(regs) determines whether a register set came from user mode.
162 * This is true if V8086 mode was enabled OR if the register set was from
163 * protected mode with RPL-3 CS value. This tricky test checks that with
164 * one comparison. Many places in the kernel can bypass this full check
165 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
167 static inline int user_mode(struct pt_regs *regs)
170 return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
172 return !!(regs->cs & 3);
176 static inline int user_mode_vm(struct pt_regs *regs)
179 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
182 return user_mode(regs);
186 static inline int v8086_mode(struct pt_regs *regs)
189 return (regs->flags & X86_VM_MASK);
191 return 0; /* No V86 mode support in long mode */
196 static inline bool user_64bit_mode(struct pt_regs *regs)
198 #if defined(CONFIG_XEN)
200 * On Xen, these are the only long mode CPL 3 selectors.
201 * We do not allow long mode selectors in the LDT.
203 return regs->cs == __USER_CS || regs->cs == FLAT_USER_CS64;
204 #elif !defined(CONFIG_PARAVIRT)
206 * On non-paravirt systems, this is the only long mode CPL 3
207 * selector. We do not allow long mode selectors in the LDT.
209 return regs->cs == __USER_CS;
211 /* Headers are too twisted for this to go in paravirt.h. */
212 return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
218 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
219 * when it traps. The previous stack will be directly underneath the saved
220 * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'.
222 * This is valid only for kernel mode traps.
224 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
227 return (unsigned long)(®s->sp);
233 #define GET_IP(regs) ((regs)->ip)
234 #define GET_FP(regs) ((regs)->bp)
235 #define GET_USP(regs) ((regs)->sp)
237 #include <asm-generic/ptrace.h>
239 /* Query offset/name of register from its name/offset */
240 extern int regs_query_register_offset(const char *name);
241 extern const char *regs_query_register_name(unsigned int offset);
242 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
245 * regs_get_register() - get register value from its offset
246 * @regs: pt_regs from which register value is gotten.
247 * @offset: offset number of the register.
249 * regs_get_register returns the value of a register. The @offset is the
250 * offset of the register in struct pt_regs address which specified by @regs.
251 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
253 static inline unsigned long regs_get_register(struct pt_regs *regs,
256 if (unlikely(offset > MAX_REG_OFFSET))
258 return *(unsigned long *)((unsigned long)regs + offset);
262 * regs_within_kernel_stack() - check the address in the stack
263 * @regs: pt_regs which contains kernel stack pointer.
264 * @addr: address which is checked.
266 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
267 * If @addr is within the kernel stack, it returns true. If not, returns false.
269 static inline int regs_within_kernel_stack(struct pt_regs *regs,
272 return ((addr & ~(THREAD_SIZE - 1)) ==
273 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
277 * regs_get_kernel_stack_nth() - get Nth entry of the stack
278 * @regs: pt_regs which contains kernel stack pointer.
279 * @n: stack entry number.
281 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
282 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
285 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
288 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
290 if (regs_within_kernel_stack(regs, (unsigned long)addr))
296 #define arch_has_single_step() (1)
297 #if defined(CONFIG_XEN)
298 #define arch_has_block_step() (0)
299 #elif defined(CONFIG_X86_DEBUGCTLMSR)
300 #define arch_has_block_step() (1)
302 #define arch_has_block_step() (boot_cpu_data.x86 >= 6)
305 #define ARCH_HAS_USER_SINGLE_STEP_INFO
308 extern int do_get_thread_area(struct task_struct *p, int idx,
309 struct user_desc __user *info);
310 extern int do_set_thread_area(struct task_struct *p, int idx,
311 struct user_desc __user *info, int can_allocate);
313 #endif /* __KERNEL__ */
315 #endif /* !__ASSEMBLY__ */
317 #endif /* _ASM_X86_PTRACE_H */