1 #ifndef _ASM_X86_PTRACE_H
2 #define _ASM_X86_PTRACE_H
4 #include <asm/segment.h>
5 #include <asm/page_types.h>
6 #include <uapi/asm/ptrace.h>
23 unsigned long orig_ax;
40 /* arguments: non interrupts/non tracing syscalls only save up to here*/
50 unsigned long orig_ax;
51 /* end of arguments */
52 /* cpu exception frame or undefined */
58 /* top of stack page */
61 #endif /* !__i386__ */
63 #ifdef CONFIG_PARAVIRT
64 #include <asm/paravirt_types.h>
70 extern unsigned long profile_pc(struct pt_regs *regs);
71 #define profile_pc profile_pc
74 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
75 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
76 int error_code, int si_code);
78 extern long syscall_trace_enter(struct pt_regs *);
79 extern void syscall_trace_leave(struct pt_regs *);
81 static inline unsigned long regs_return_value(struct pt_regs *regs)
87 * user_mode_vm(regs) determines whether a register set came from user mode.
88 * This is true if V8086 mode was enabled OR if the register set was from
89 * protected mode with RPL-3 CS value. This tricky test checks that with
90 * one comparison. Many places in the kernel can bypass this full check
91 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
93 static inline int user_mode(struct pt_regs *regs)
96 return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
98 return !!(regs->cs & 3);
102 static inline int user_mode_vm(struct pt_regs *regs)
105 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
108 return user_mode(regs);
112 static inline int v8086_mode(struct pt_regs *regs)
115 return (regs->flags & X86_VM_MASK);
117 return 0; /* No V86 mode support in long mode */
122 static inline bool user_64bit_mode(struct pt_regs *regs)
124 #ifndef CONFIG_PARAVIRT
126 * On non-paravirt systems, this is the only long mode CPL 3
127 * selector. We do not allow long mode selectors in the LDT.
129 return regs->cs == __USER_CS;
131 /* Headers are too twisted for this to go in paravirt.h. */
132 return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
136 #define current_user_stack_pointer() this_cpu_read(old_rsp)
137 /* ia32 vs. x32 difference */
138 #define compat_user_stack_pointer() \
139 (test_thread_flag(TIF_IA32) \
140 ? current_pt_regs()->sp \
141 : this_cpu_read(old_rsp))
145 extern unsigned long kernel_stack_pointer(struct pt_regs *regs);
147 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
153 #define GET_IP(regs) ((regs)->ip)
154 #define GET_FP(regs) ((regs)->bp)
155 #define GET_USP(regs) ((regs)->sp)
157 #include <asm-generic/ptrace.h>
159 /* Query offset/name of register from its name/offset */
160 extern int regs_query_register_offset(const char *name);
161 extern const char *regs_query_register_name(unsigned int offset);
162 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
165 * regs_get_register() - get register value from its offset
166 * @regs: pt_regs from which register value is gotten.
167 * @offset: offset number of the register.
169 * regs_get_register returns the value of a register. The @offset is the
170 * offset of the register in struct pt_regs address which specified by @regs.
171 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
173 static inline unsigned long regs_get_register(struct pt_regs *regs,
176 if (unlikely(offset > MAX_REG_OFFSET))
180 * Traps from the kernel do not save sp and ss.
181 * Use the helper function to retrieve sp.
183 if (offset == offsetof(struct pt_regs, sp) &&
184 regs->cs == __KERNEL_CS)
185 return kernel_stack_pointer(regs);
187 return *(unsigned long *)((unsigned long)regs + offset);
191 * regs_within_kernel_stack() - check the address in the stack
192 * @regs: pt_regs which contains kernel stack pointer.
193 * @addr: address which is checked.
195 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
196 * If @addr is within the kernel stack, it returns true. If not, returns false.
198 static inline int regs_within_kernel_stack(struct pt_regs *regs,
201 return ((addr & ~(THREAD_SIZE - 1)) ==
202 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
206 * regs_get_kernel_stack_nth() - get Nth entry of the stack
207 * @regs: pt_regs which contains kernel stack pointer.
208 * @n: stack entry number.
210 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
211 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
214 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
217 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
219 if (regs_within_kernel_stack(regs, (unsigned long)addr))
225 #define arch_has_single_step() (1)
226 #ifdef CONFIG_X86_DEBUGCTLMSR
227 #define arch_has_block_step() (1)
229 #define arch_has_block_step() (boot_cpu_data.x86 >= 6)
232 #define ARCH_HAS_USER_SINGLE_STEP_INFO
235 extern int do_get_thread_area(struct task_struct *p, int idx,
236 struct user_desc __user *info);
237 extern int do_set_thread_area(struct task_struct *p, int idx,
238 struct user_desc __user *info, int can_allocate);
240 #endif /* !__ASSEMBLY__ */
241 #endif /* _ASM_X86_PTRACE_H */