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 #include <linux/init.h>
64 #ifdef CONFIG_PARAVIRT
65 #include <asm/paravirt_types.h>
71 extern unsigned long profile_pc(struct pt_regs *regs);
72 #define profile_pc profile_pc
75 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
76 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
77 int error_code, int si_code);
79 extern long syscall_trace_enter(struct pt_regs *);
80 extern void syscall_trace_leave(struct pt_regs *);
82 static inline unsigned long regs_return_value(struct pt_regs *regs)
88 * user_mode_vm(regs) determines whether a register set came from user mode.
89 * This is true if V8086 mode was enabled OR if the register set was from
90 * protected mode with RPL-3 CS value. This tricky test checks that with
91 * one comparison. Many places in the kernel can bypass this full check
92 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
94 static inline int user_mode(struct pt_regs *regs)
97 return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
99 return !!(regs->cs & 3);
103 static inline int user_mode_vm(struct pt_regs *regs)
106 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
109 return user_mode(regs);
113 static inline int v8086_mode(struct pt_regs *regs)
116 return (regs->flags & X86_VM_MASK);
118 return 0; /* No V86 mode support in long mode */
123 static inline bool user_64bit_mode(struct pt_regs *regs)
125 #ifndef CONFIG_PARAVIRT
127 * On non-paravirt systems, this is the only long mode CPL 3
128 * selector. We do not allow long mode selectors in the LDT.
130 return regs->cs == __USER_CS;
132 /* Headers are too twisted for this to go in paravirt.h. */
133 return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
137 #define current_user_stack_pointer() this_cpu_read(old_rsp)
138 /* ia32 vs. x32 difference */
139 #define compat_user_stack_pointer() \
140 (test_thread_flag(TIF_IA32) \
141 ? current_pt_regs()->sp \
142 : this_cpu_read(old_rsp))
146 extern unsigned long kernel_stack_pointer(struct pt_regs *regs);
148 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
154 #define GET_IP(regs) ((regs)->ip)
155 #define GET_FP(regs) ((regs)->bp)
156 #define GET_USP(regs) ((regs)->sp)
158 #include <asm-generic/ptrace.h>
160 /* Query offset/name of register from its name/offset */
161 extern int regs_query_register_offset(const char *name);
162 extern const char *regs_query_register_name(unsigned int offset);
163 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
166 * regs_get_register() - get register value from its offset
167 * @regs: pt_regs from which register value is gotten.
168 * @offset: offset number of the register.
170 * regs_get_register returns the value of a register. The @offset is the
171 * offset of the register in struct pt_regs address which specified by @regs.
172 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
174 static inline unsigned long regs_get_register(struct pt_regs *regs,
177 if (unlikely(offset > MAX_REG_OFFSET))
181 * Traps from the kernel do not save sp and ss.
182 * Use the helper function to retrieve sp.
184 if (offset == offsetof(struct pt_regs, sp) &&
185 regs->cs == __KERNEL_CS)
186 return kernel_stack_pointer(regs);
188 return *(unsigned long *)((unsigned long)regs + offset);
192 * regs_within_kernel_stack() - check the address in the stack
193 * @regs: pt_regs which contains kernel stack pointer.
194 * @addr: address which is checked.
196 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
197 * If @addr is within the kernel stack, it returns true. If not, returns false.
199 static inline int regs_within_kernel_stack(struct pt_regs *regs,
202 return ((addr & ~(THREAD_SIZE - 1)) ==
203 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
207 * regs_get_kernel_stack_nth() - get Nth entry of the stack
208 * @regs: pt_regs which contains kernel stack pointer.
209 * @n: stack entry number.
211 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
212 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
215 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
218 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
220 if (regs_within_kernel_stack(regs, (unsigned long)addr))
226 #define arch_has_single_step() (1)
227 #ifdef CONFIG_X86_DEBUGCTLMSR
228 #define arch_has_block_step() (1)
230 #define arch_has_block_step() (boot_cpu_data.x86 >= 6)
233 #define ARCH_HAS_USER_SINGLE_STEP_INFO
236 extern int do_get_thread_area(struct task_struct *p, int idx,
237 struct user_desc __user *info);
238 extern int do_set_thread_area(struct task_struct *p, int idx,
239 struct user_desc __user *info, int can_allocate);
241 #endif /* !__ASSEMBLY__ */
242 #endif /* _ASM_X86_PTRACE_H */