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>
141 extern unsigned long profile_pc(struct pt_regs *regs);
142 #define profile_pc profile_pc
145 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
146 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
147 int error_code, int si_code);
149 extern long syscall_trace_enter(struct pt_regs *);
150 extern void syscall_trace_leave(struct pt_regs *);
152 static inline unsigned long regs_return_value(struct pt_regs *regs)
158 * user_mode_vm(regs) determines whether a register set came from user mode.
159 * This is true if V8086 mode was enabled OR if the register set was from
160 * protected mode with RPL-3 CS value. This tricky test checks that with
161 * one comparison. Many places in the kernel can bypass this full check
162 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
164 static inline int user_mode(struct pt_regs *regs)
167 return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
169 return !!(regs->cs & 3);
173 static inline int user_mode_vm(struct pt_regs *regs)
176 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
179 return user_mode(regs);
183 static inline int v8086_mode(struct pt_regs *regs)
186 return (regs->flags & X86_VM_MASK);
188 return 0; /* No V86 mode support in long mode */
193 static inline bool user_64bit_mode(struct pt_regs *regs)
195 #ifndef CONFIG_PARAVIRT
197 * On non-paravirt systems, this is the only long mode CPL 3
198 * selector. We do not allow long mode selectors in the LDT.
200 return regs->cs == __USER_CS;
202 /* Headers are too twisted for this to go in paravirt.h. */
203 return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
209 extern unsigned long kernel_stack_pointer(struct pt_regs *regs);
211 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
217 #define GET_IP(regs) ((regs)->ip)
218 #define GET_FP(regs) ((regs)->bp)
219 #define GET_USP(regs) ((regs)->sp)
221 #include <asm-generic/ptrace.h>
223 /* Query offset/name of register from its name/offset */
224 extern int regs_query_register_offset(const char *name);
225 extern const char *regs_query_register_name(unsigned int offset);
226 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
229 * regs_get_register() - get register value from its offset
230 * @regs: pt_regs from which register value is gotten.
231 * @offset: offset number of the register.
233 * regs_get_register returns the value of a register. The @offset is the
234 * offset of the register in struct pt_regs address which specified by @regs.
235 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
237 static inline unsigned long regs_get_register(struct pt_regs *regs,
240 if (unlikely(offset > MAX_REG_OFFSET))
244 * Traps from the kernel do not save sp and ss.
245 * Use the helper function to retrieve sp.
247 if (offset == offsetof(struct pt_regs, sp) &&
248 regs->cs == __KERNEL_CS)
249 return kernel_stack_pointer(regs);
251 return *(unsigned long *)((unsigned long)regs + offset);
255 * regs_within_kernel_stack() - check the address in the stack
256 * @regs: pt_regs which contains kernel stack pointer.
257 * @addr: address which is checked.
259 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
260 * If @addr is within the kernel stack, it returns true. If not, returns false.
262 static inline int regs_within_kernel_stack(struct pt_regs *regs,
265 return ((addr & ~(THREAD_SIZE - 1)) ==
266 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
270 * regs_get_kernel_stack_nth() - get Nth entry of the stack
271 * @regs: pt_regs which contains kernel stack pointer.
272 * @n: stack entry number.
274 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
275 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
278 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
281 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
283 if (regs_within_kernel_stack(regs, (unsigned long)addr))
289 #define arch_has_single_step() (1)
290 #ifdef CONFIG_X86_DEBUGCTLMSR
291 #define arch_has_block_step() (1)
293 #define arch_has_block_step() (boot_cpu_data.x86 >= 6)
296 #define ARCH_HAS_USER_SINGLE_STEP_INFO
299 extern int do_get_thread_area(struct task_struct *p, int idx,
300 struct user_desc __user *info);
301 extern int do_set_thread_area(struct task_struct *p, int idx,
302 struct user_desc __user *info, int can_allocate);
304 #endif /* __KERNEL__ */
306 #endif /* !__ASSEMBLY__ */
308 #endif /* _ASM_X86_PTRACE_H */