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Linux/arch/x86/include/asm/ptrace.h

  1 #ifndef _ASM_X86_PTRACE_H
  2 #define _ASM_X86_PTRACE_H
  3 
  4 #include <asm/segment.h>
  5 #include <asm/page_types.h>
  6 #include <uapi/asm/ptrace.h>
  7 
  8 #ifndef __ASSEMBLY__
  9 #ifdef __i386__
 10 
 11 struct pt_regs {
 12         unsigned long bx;
 13         unsigned long cx;
 14         unsigned long dx;
 15         unsigned long si;
 16         unsigned long di;
 17         unsigned long bp;
 18         unsigned long ax;
 19         unsigned long ds;
 20         unsigned long es;
 21         unsigned long fs;
 22         unsigned long gs;
 23         unsigned long orig_ax;
 24         unsigned long ip;
 25         unsigned long cs;
 26         unsigned long flags;
 27         unsigned long sp;
 28         unsigned long ss;
 29 };
 30 
 31 #else /* __i386__ */
 32 
 33 struct pt_regs {
 34         unsigned long r15;
 35         unsigned long r14;
 36         unsigned long r13;
 37         unsigned long r12;
 38         unsigned long bp;
 39         unsigned long bx;
 40 /* arguments: non interrupts/non tracing syscalls only save up to here*/
 41         unsigned long r11;
 42         unsigned long r10;
 43         unsigned long r9;
 44         unsigned long r8;
 45         unsigned long ax;
 46         unsigned long cx;
 47         unsigned long dx;
 48         unsigned long si;
 49         unsigned long di;
 50         unsigned long orig_ax;
 51 /* end of arguments */
 52 /* cpu exception frame or undefined */
 53         unsigned long ip;
 54         unsigned long cs;
 55         unsigned long flags;
 56         unsigned long sp;
 57         unsigned long ss;
 58 /* top of stack page */
 59 };
 60 
 61 #endif /* !__i386__ */
 62 
 63 #ifdef CONFIG_PARAVIRT
 64 #include <asm/paravirt_types.h>
 65 #endif
 66 
 67 struct cpuinfo_x86;
 68 struct task_struct;
 69 
 70 extern unsigned long profile_pc(struct pt_regs *regs);
 71 #define profile_pc profile_pc
 72 
 73 extern unsigned long
 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);
 77 
 78 
 79 extern unsigned long syscall_trace_enter_phase1(struct pt_regs *, u32 arch);
 80 extern long syscall_trace_enter_phase2(struct pt_regs *, u32 arch,
 81                                        unsigned long phase1_result);
 82 
 83 extern long syscall_trace_enter(struct pt_regs *);
 84 extern void syscall_trace_leave(struct pt_regs *);
 85 
 86 static inline unsigned long regs_return_value(struct pt_regs *regs)
 87 {
 88         return regs->ax;
 89 }
 90 
 91 /*
 92  * user_mode_vm(regs) determines whether a register set came from user mode.
 93  * This is true if V8086 mode was enabled OR if the register set was from
 94  * protected mode with RPL-3 CS value.  This tricky test checks that with
 95  * one comparison.  Many places in the kernel can bypass this full check
 96  * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
 97  */
 98 static inline int user_mode(struct pt_regs *regs)
 99 {
100 #ifdef CONFIG_X86_32
101         return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
102 #else
103         return !!(regs->cs & 3);
104 #endif
105 }
106 
107 static inline int user_mode_vm(struct pt_regs *regs)
108 {
109 #ifdef CONFIG_X86_32
110         return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
111                 USER_RPL;
112 #else
113         return user_mode(regs);
114 #endif
115 }
116 
117 static inline int v8086_mode(struct pt_regs *regs)
118 {
119 #ifdef CONFIG_X86_32
120         return (regs->flags & X86_VM_MASK);
121 #else
122         return 0;       /* No V86 mode support in long mode */
123 #endif
124 }
125 
126 #ifdef CONFIG_X86_64
127 static inline bool user_64bit_mode(struct pt_regs *regs)
128 {
129 #ifndef CONFIG_PARAVIRT
130         /*
131          * On non-paravirt systems, this is the only long mode CPL 3
132          * selector.  We do not allow long mode selectors in the LDT.
133          */
134         return regs->cs == __USER_CS;
135 #else
136         /* Headers are too twisted for this to go in paravirt.h. */
137         return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
138 #endif
139 }
140 
141 #define current_user_stack_pointer()    this_cpu_read(old_rsp)
142 /* ia32 vs. x32 difference */
143 #define compat_user_stack_pointer()     \
144         (test_thread_flag(TIF_IA32)     \
145          ? current_pt_regs()->sp        \
146          : this_cpu_read(old_rsp))
147 #endif
148 
149 #ifdef CONFIG_X86_32
150 extern unsigned long kernel_stack_pointer(struct pt_regs *regs);
151 #else
152 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
153 {
154         return regs->sp;
155 }
156 #endif
157 
158 #define GET_IP(regs) ((regs)->ip)
159 #define GET_FP(regs) ((regs)->bp)
160 #define GET_USP(regs) ((regs)->sp)
161 
162 #include <asm-generic/ptrace.h>
163 
164 /* Query offset/name of register from its name/offset */
165 extern int regs_query_register_offset(const char *name);
166 extern const char *regs_query_register_name(unsigned int offset);
167 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
168 
169 /**
170  * regs_get_register() - get register value from its offset
171  * @regs:       pt_regs from which register value is gotten.
172  * @offset:     offset number of the register.
173  *
174  * regs_get_register returns the value of a register. The @offset is the
175  * offset of the register in struct pt_regs address which specified by @regs.
176  * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
177  */
178 static inline unsigned long regs_get_register(struct pt_regs *regs,
179                                               unsigned int offset)
180 {
181         if (unlikely(offset > MAX_REG_OFFSET))
182                 return 0;
183 #ifdef CONFIG_X86_32
184         /*
185          * Traps from the kernel do not save sp and ss.
186          * Use the helper function to retrieve sp.
187          */
188         if (offset == offsetof(struct pt_regs, sp) &&
189             regs->cs == __KERNEL_CS)
190                 return kernel_stack_pointer(regs);
191 #endif
192         return *(unsigned long *)((unsigned long)regs + offset);
193 }
194 
195 /**
196  * regs_within_kernel_stack() - check the address in the stack
197  * @regs:       pt_regs which contains kernel stack pointer.
198  * @addr:       address which is checked.
199  *
200  * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
201  * If @addr is within the kernel stack, it returns true. If not, returns false.
202  */
203 static inline int regs_within_kernel_stack(struct pt_regs *regs,
204                                            unsigned long addr)
205 {
206         return ((addr & ~(THREAD_SIZE - 1))  ==
207                 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
208 }
209 
210 /**
211  * regs_get_kernel_stack_nth() - get Nth entry of the stack
212  * @regs:       pt_regs which contains kernel stack pointer.
213  * @n:          stack entry number.
214  *
215  * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
216  * is specified by @regs. If the @n th entry is NOT in the kernel stack,
217  * this returns 0.
218  */
219 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
220                                                       unsigned int n)
221 {
222         unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
223         addr += n;
224         if (regs_within_kernel_stack(regs, (unsigned long)addr))
225                 return *addr;
226         else
227                 return 0;
228 }
229 
230 #define arch_has_single_step()  (1)
231 #ifdef CONFIG_X86_DEBUGCTLMSR
232 #define arch_has_block_step()   (1)
233 #else
234 #define arch_has_block_step()   (boot_cpu_data.x86 >= 6)
235 #endif
236 
237 #define ARCH_HAS_USER_SINGLE_STEP_INFO
238 
239 /*
240  * When hitting ptrace_stop(), we cannot return using SYSRET because
241  * that does not restore the full CPU state, only a minimal set.  The
242  * ptracer can change arbitrary register values, which is usually okay
243  * because the usual ptrace stops run off the signal delivery path which
244  * forces IRET; however, ptrace_event() stops happen in arbitrary places
245  * in the kernel and don't force IRET path.
246  *
247  * So force IRET path after a ptrace stop.
248  */
249 #define arch_ptrace_stop_needed(code, info)                             \
250 ({                                                                      \
251         set_thread_flag(TIF_NOTIFY_RESUME);                             \
252         false;                                                          \
253 })
254 
255 struct user_desc;
256 extern int do_get_thread_area(struct task_struct *p, int idx,
257                               struct user_desc __user *info);
258 extern int do_set_thread_area(struct task_struct *p, int idx,
259                               struct user_desc __user *info, int can_allocate);
260 
261 #endif /* !__ASSEMBLY__ */
262 #endif /* _ASM_X86_PTRACE_H */
263 

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