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 extern long syscall_trace_enter(struct pt_regs *);
  79 extern void syscall_trace_leave(struct pt_regs *);
  80
  81 static inline unsigned long regs_return_value(struct pt_regs *regs)
  82 {
  83         return regs->ax;
  84 }
  85
  86 /*
  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.
  92  */
  93 static inline int user_mode(struct pt_regs *regs)
  94 {
  95 #ifdef CONFIG_X86_32
  96         return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
  97 #else
  98         return !!(regs->cs & 3);
  99 #endif
 100 }
 101
 102 static inline int user_mode_vm(struct pt_regs *regs)
 103 {
 104 #ifdef CONFIG_X86_32
 105         return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
 106                 USER_RPL;
 107 #else
 108         return user_mode(regs);
 109 #endif
 110 }
 111
 112 static inline int v8086_mode(struct pt_regs *regs)
 113 {
 114 #ifdef CONFIG_X86_32
 115         return (regs->flags & X86_VM_MASK);
 116 #else
 117         return 0;       /* No V86 mode support in long mode */
 118 #endif
 119 }
 120
 121 #ifdef CONFIG_X86_64
 122 static inline bool user_64bit_mode(struct pt_regs *regs)
 123 {
 124 #ifndef CONFIG_PARAVIRT
 125         /*
 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.
 128          */
 129         return regs->cs == __USER_CS;
 130 #else
 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;
 133 #endif
 134 }
 135
 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))
 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 struct user_desc;
 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);
 239
 240 #endif /* !__ASSEMBLY__ */
 241 #endif /* _ASM_X86_PTRACE_H */