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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 static inline unsigned long regs_return_value(struct pt_regs *regs)
 87 {
 88         return regs->ax;
 89 }
 90 
 91 /*
 92  * user_mode(regs) determines whether a register set came from user
 93  * mode.  On x86_32, this is true if V8086 mode was enabled OR if the
 94  * register set was from protected mode with RPL-3 CS value.  This
 95  * tricky test checks that with one comparison.
 96  *
 97  * On x86_64, vm86 mode is mercifully nonexistent, and we don't need
 98  * the extra check.
 99  */
100 static inline int user_mode(struct pt_regs *regs)
101 {
102 #ifdef CONFIG_X86_32
103         return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= USER_RPL;
104 #else
105         return !!(regs->cs & 3);
106 #endif
107 }
108 
109 static inline int v8086_mode(struct pt_regs *regs)
110 {
111 #ifdef CONFIG_X86_32
112         return (regs->flags & X86_VM_MASK);
113 #else
114         return 0;       /* No V86 mode support in long mode */
115 #endif
116 }
117 
118 #ifdef CONFIG_X86_64
119 static inline bool user_64bit_mode(struct pt_regs *regs)
120 {
121 #ifndef CONFIG_PARAVIRT
122         /*
123          * On non-paravirt systems, this is the only long mode CPL 3
124          * selector.  We do not allow long mode selectors in the LDT.
125          */
126         return regs->cs == __USER_CS;
127 #else
128         /* Headers are too twisted for this to go in paravirt.h. */
129         return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs;
130 #endif
131 }
132 
133 #define current_user_stack_pointer()    current_pt_regs()->sp
134 #define compat_user_stack_pointer()     current_pt_regs()->sp
135 #endif
136 
137 #ifdef CONFIG_X86_32
138 extern unsigned long kernel_stack_pointer(struct pt_regs *regs);
139 #else
140 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
141 {
142         return regs->sp;
143 }
144 #endif
145 
146 #define GET_IP(regs) ((regs)->ip)
147 #define GET_FP(regs) ((regs)->bp)
148 #define GET_USP(regs) ((regs)->sp)
149 
150 #include <asm-generic/ptrace.h>
151 
152 /* Query offset/name of register from its name/offset */
153 extern int regs_query_register_offset(const char *name);
154 extern const char *regs_query_register_name(unsigned int offset);
155 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
156 
157 /**
158  * regs_get_register() - get register value from its offset
159  * @regs:       pt_regs from which register value is gotten.
160  * @offset:     offset number of the register.
161  *
162  * regs_get_register returns the value of a register. The @offset is the
163  * offset of the register in struct pt_regs address which specified by @regs.
164  * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
165  */
166 static inline unsigned long regs_get_register(struct pt_regs *regs,
167                                               unsigned int offset)
168 {
169         if (unlikely(offset > MAX_REG_OFFSET))
170                 return 0;
171 #ifdef CONFIG_X86_32
172         /*
173          * Traps from the kernel do not save sp and ss.
174          * Use the helper function to retrieve sp.
175          */
176         if (offset == offsetof(struct pt_regs, sp) &&
177             regs->cs == __KERNEL_CS)
178                 return kernel_stack_pointer(regs);
179 #endif
180         return *(unsigned long *)((unsigned long)regs + offset);
181 }
182 
183 /**
184  * regs_within_kernel_stack() - check the address in the stack
185  * @regs:       pt_regs which contains kernel stack pointer.
186  * @addr:       address which is checked.
187  *
188  * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
189  * If @addr is within the kernel stack, it returns true. If not, returns false.
190  */
191 static inline int regs_within_kernel_stack(struct pt_regs *regs,
192                                            unsigned long addr)
193 {
194         return ((addr & ~(THREAD_SIZE - 1))  ==
195                 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
196 }
197 
198 /**
199  * regs_get_kernel_stack_nth() - get Nth entry of the stack
200  * @regs:       pt_regs which contains kernel stack pointer.
201  * @n:          stack entry number.
202  *
203  * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
204  * is specified by @regs. If the @n th entry is NOT in the kernel stack,
205  * this returns 0.
206  */
207 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
208                                                       unsigned int n)
209 {
210         unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
211         addr += n;
212         if (regs_within_kernel_stack(regs, (unsigned long)addr))
213                 return *addr;
214         else
215                 return 0;
216 }
217 
218 #define arch_has_single_step()  (1)
219 #ifdef CONFIG_X86_DEBUGCTLMSR
220 #define arch_has_block_step()   (1)
221 #else
222 #define arch_has_block_step()   (boot_cpu_data.x86 >= 6)
223 #endif
224 
225 #define ARCH_HAS_USER_SINGLE_STEP_INFO
226 
227 /*
228  * When hitting ptrace_stop(), we cannot return using SYSRET because
229  * that does not restore the full CPU state, only a minimal set.  The
230  * ptracer can change arbitrary register values, which is usually okay
231  * because the usual ptrace stops run off the signal delivery path which
232  * forces IRET; however, ptrace_event() stops happen in arbitrary places
233  * in the kernel and don't force IRET path.
234  *
235  * So force IRET path after a ptrace stop.
236  */
237 #define arch_ptrace_stop_needed(code, info)                             \
238 ({                                                                      \
239         force_iret();                                                   \
240         false;                                                          \
241 })
242 
243 struct user_desc;
244 extern int do_get_thread_area(struct task_struct *p, int idx,
245                               struct user_desc __user *info);
246 extern int do_set_thread_area(struct task_struct *p, int idx,
247                               struct user_desc __user *info, int can_allocate);
248 
249 #endif /* !__ASSEMBLY__ */
250 #endif /* _ASM_X86_PTRACE_H */
251 

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