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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 /*
 35  * C ABI says these regs are callee-preserved. They aren't saved on kernel entry
 36  * unless syscall needs a complete, fully filled "struct pt_regs".
 37  */
 38         unsigned long r15;
 39         unsigned long r14;
 40         unsigned long r13;
 41         unsigned long r12;
 42         unsigned long bp;
 43         unsigned long bx;
 44 /* These regs are callee-clobbered. Always saved on kernel entry. */
 45         unsigned long r11;
 46         unsigned long r10;
 47         unsigned long r9;
 48         unsigned long r8;
 49         unsigned long ax;
 50         unsigned long cx;
 51         unsigned long dx;
 52         unsigned long si;
 53         unsigned long di;
 54 /*
 55  * On syscall entry, this is syscall#. On CPU exception, this is error code.
 56  * On hw interrupt, it's IRQ number:
 57  */
 58         unsigned long orig_ax;
 59 /* Return frame for iretq */
 60         unsigned long ip;
 61         unsigned long cs;
 62         unsigned long flags;
 63         unsigned long sp;
 64         unsigned long ss;
 65 /* top of stack page */
 66 };
 67 
 68 #endif /* !__i386__ */
 69 
 70 #ifdef CONFIG_PARAVIRT
 71 #include <asm/paravirt_types.h>
 72 #endif
 73 
 74 struct cpuinfo_x86;
 75 struct task_struct;
 76 
 77 extern unsigned long profile_pc(struct pt_regs *regs);
 78 #define profile_pc profile_pc
 79 
 80 extern unsigned long
 81 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
 82 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
 83                          int error_code, int si_code);
 84 
 85 
 86 extern unsigned long syscall_trace_enter_phase1(struct pt_regs *, u32 arch);
 87 extern long syscall_trace_enter_phase2(struct pt_regs *, u32 arch,
 88                                        unsigned long phase1_result);
 89 
 90 extern long syscall_trace_enter(struct pt_regs *);
 91 extern void syscall_trace_leave(struct pt_regs *);
 92 
 93 static inline unsigned long regs_return_value(struct pt_regs *regs)
 94 {
 95         return regs->ax;
 96 }
 97 
 98 /*
 99  * user_mode(regs) determines whether a register set came from user
100  * mode.  On x86_32, this is true if V8086 mode was enabled OR if the
101  * register set was from protected mode with RPL-3 CS value.  This
102  * tricky test checks that with one comparison.
103  *
104  * On x86_64, vm86 mode is mercifully nonexistent, and we don't need
105  * the extra check.
106  */
107 static inline int user_mode(struct pt_regs *regs)
108 {
109 #ifdef CONFIG_X86_32
110         return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= USER_RPL;
111 #else
112         return !!(regs->cs & 3);
113 #endif
114 }
115 
116 static inline int v8086_mode(struct pt_regs *regs)
117 {
118 #ifdef CONFIG_X86_32
119         return (regs->flags & X86_VM_MASK);
120 #else
121         return 0;       /* No V86 mode support in long mode */
122 #endif
123 }
124 
125 #ifdef CONFIG_X86_64
126 static inline bool user_64bit_mode(struct pt_regs *regs)
127 {
128 #ifndef CONFIG_PARAVIRT
129         /*
130          * On non-paravirt systems, this is the only long mode CPL 3
131          * selector.  We do not allow long mode selectors in the LDT.
132          */
133         return regs->cs == __USER_CS;
134 #else
135         /* Headers are too twisted for this to go in paravirt.h. */
136         return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
137 #endif
138 }
139 
140 #define current_user_stack_pointer()    current_pt_regs()->sp
141 #define compat_user_stack_pointer()     current_pt_regs()->sp
142 #endif
143 
144 #ifdef CONFIG_X86_32
145 extern unsigned long kernel_stack_pointer(struct pt_regs *regs);
146 #else
147 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
148 {
149         return regs->sp;
150 }
151 #endif
152 
153 #define GET_IP(regs) ((regs)->ip)
154 #define GET_FP(regs) ((regs)->bp)
155 #define GET_USP(regs) ((regs)->sp)
156 
157 #include <asm-generic/ptrace.h>
158 
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))
163 
164 /**
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.
168  *
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.
172  */
173 static inline unsigned long regs_get_register(struct pt_regs *regs,
174                                               unsigned int offset)
175 {
176         if (unlikely(offset > MAX_REG_OFFSET))
177                 return 0;
178 #ifdef CONFIG_X86_32
179         /*
180          * Traps from the kernel do not save sp and ss.
181          * Use the helper function to retrieve sp.
182          */
183         if (offset == offsetof(struct pt_regs, sp) &&
184             regs->cs == __KERNEL_CS)
185                 return kernel_stack_pointer(regs);
186 #endif
187         return *(unsigned long *)((unsigned long)regs + offset);
188 }
189 
190 /**
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.
194  *
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.
197  */
198 static inline int regs_within_kernel_stack(struct pt_regs *regs,
199                                            unsigned long addr)
200 {
201         return ((addr & ~(THREAD_SIZE - 1))  ==
202                 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
203 }
204 
205 /**
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.
209  *
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,
212  * this returns 0.
213  */
214 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
215                                                       unsigned int n)
216 {
217         unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
218         addr += n;
219         if (regs_within_kernel_stack(regs, (unsigned long)addr))
220                 return *addr;
221         else
222                 return 0;
223 }
224 
225 #define arch_has_single_step()  (1)
226 #ifdef CONFIG_X86_DEBUGCTLMSR
227 #define arch_has_block_step()   (1)
228 #else
229 #define arch_has_block_step()   (boot_cpu_data.x86 >= 6)
230 #endif
231 
232 #define ARCH_HAS_USER_SINGLE_STEP_INFO
233 
234 /*
235  * When hitting ptrace_stop(), we cannot return using SYSRET because
236  * that does not restore the full CPU state, only a minimal set.  The
237  * ptracer can change arbitrary register values, which is usually okay
238  * because the usual ptrace stops run off the signal delivery path which
239  * forces IRET; however, ptrace_event() stops happen in arbitrary places
240  * in the kernel and don't force IRET path.
241  *
242  * So force IRET path after a ptrace stop.
243  */
244 #define arch_ptrace_stop_needed(code, info)                             \
245 ({                                                                      \
246         force_iret();                                                   \
247         false;                                                          \
248 })
249 
250 struct user_desc;
251 extern int do_get_thread_area(struct task_struct *p, int idx,
252                               struct user_desc __user *info);
253 extern int do_set_thread_area(struct task_struct *p, int idx,
254                               struct user_desc __user *info, int can_allocate);
255 
256 #endif /* !__ASSEMBLY__ */
257 #endif /* _ASM_X86_PTRACE_H */
258 

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