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 #include <linux/init.h>
  64 #ifdef CONFIG_PARAVIRT
  65 #include <asm/paravirt_types.h>
  66 #endif
  67
  68 struct cpuinfo_x86;
  69 struct task_struct;
  70
  71 extern unsigned long profile_pc(struct pt_regs *regs);
  72 #define profile_pc profile_pc
  73
  74 extern unsigned long
  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);
  78
  79 extern long syscall_trace_enter(struct pt_regs *);
  80 extern void syscall_trace_leave(struct pt_regs *);
  81
  82 static inline unsigned long regs_return_value(struct pt_regs *regs)
  83 {
  84         return regs->ax;
  85 }
  86
  87 /*
  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.
  93  */
  94 static inline int user_mode(struct pt_regs *regs)
  95 {
  96 #ifdef CONFIG_X86_32
  97         return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
  98 #else
  99         return !!(regs->cs & 3);
 100 #endif
 101 }
 102
 103 static inline int user_mode_vm(struct pt_regs *regs)
 104 {
 105 #ifdef CONFIG_X86_32
 106         return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
 107                 USER_RPL;
 108 #else
 109         return user_mode(regs);
 110 #endif
 111 }
 112
 113 static inline int v8086_mode(struct pt_regs *regs)
 114 {
 115 #ifdef CONFIG_X86_32
 116         return (regs->flags & X86_VM_MASK);
 117 #else
 118         return 0;       /* No V86 mode support in long mode */
 119 #endif
 120 }
 121
 122 #ifdef CONFIG_X86_64
 123 static inline bool user_64bit_mode(struct pt_regs *regs)
 124 {
 125 #ifndef CONFIG_PARAVIRT
 126         /*
 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.
 129          */
 130         return regs->cs == __USER_CS;
 131 #else
 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;
 134 #endif
 135 }
 136
 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))
 143 #endif
 144
 145 #ifdef CONFIG_X86_32
 146 extern unsigned long kernel_stack_pointer(struct pt_regs *regs);
 147 #else
 148 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
 149 {
 150         return regs->sp;
 151 }
 152 #endif
 153
 154 #define GET_IP(regs) ((regs)->ip)
 155 #define GET_FP(regs) ((regs)->bp)
 156 #define GET_USP(regs) ((regs)->sp)
 157
 158 #include <asm-generic/ptrace.h>
 159
 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))
 164
 165 /**
 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.
 169  *
 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.
 173  */
 174 static inline unsigned long regs_get_register(struct pt_regs *regs,
 175                                               unsigned int offset)
 176 {
 177         if (unlikely(offset > MAX_REG_OFFSET))
 178                 return 0;
 179 #ifdef CONFIG_X86_32
 180         /*
 181          * Traps from the kernel do not save sp and ss.
 182          * Use the helper function to retrieve sp.
 183          */
 184         if (offset == offsetof(struct pt_regs, sp) &&
 185             regs->cs == __KERNEL_CS)
 186                 return kernel_stack_pointer(regs);
 187 #endif
 188         return *(unsigned long *)((unsigned long)regs + offset);
 189 }
 190
 191 /**
 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.
 195  *
 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.
 198  */
 199 static inline int regs_within_kernel_stack(struct pt_regs *regs,
 200                                            unsigned long addr)
 201 {
 202         return ((addr & ~(THREAD_SIZE - 1))  ==
 203                 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
 204 }
 205
 206 /**
 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.
 210  *
 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,
 213  * this returns 0.
 214  */
 215 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
 216                                                       unsigned int n)
 217 {
 218         unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
 219         addr += n;
 220         if (regs_within_kernel_stack(regs, (unsigned long)addr))
 221                 return *addr;
 222         else
 223                 return 0;
 224 }
 225
 226 #define arch_has_single_step()  (1)
 227 #ifdef CONFIG_X86_DEBUGCTLMSR
 228 #define arch_has_block_step()   (1)
 229 #else
 230 #define arch_has_block_step()   (boot_cpu_data.x86 >= 6)
 231 #endif
 232
 233 #define ARCH_HAS_USER_SINGLE_STEP_INFO
 234
 235 struct user_desc;
 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);
 240
 241 #endif /* !__ASSEMBLY__ */
 242 #endif /* _ASM_X86_PTRACE_H */