arch/x86/include/asm/ptrace.h

   1 #ifndef _ASM_X86_PTRACE_H
   2 #define _ASM_X86_PTRACE_H
   3
   4 #include <linux/compiler.h>     /* For __user */
   5 #include <asm/ptrace-abi.h>
   6 #include <asm/processor-flags.h>
   7
   8 #ifdef __KERNEL__
   9 #include <asm/segment.h>
  10 #endif
  11
  12 #ifndef __ASSEMBLY__
  13
  14 #ifdef __i386__
  15 /* this struct defines the way the registers are stored on the
  16    stack during a system call. */
  17
  18 #ifndef __KERNEL__
  19
  20 struct pt_regs {
  21         long ebx;
  22         long ecx;
  23         long edx;
  24         long esi;
  25         long edi;
  26         long ebp;
  27         long eax;
  28         int  xds;
  29         int  xes;
  30         int  xfs;
  31         int  xgs;
  32         long orig_eax;
  33         long eip;
  34         int  xcs;
  35         long eflags;
  36         long esp;
  37         int  xss;
  38 };
  39
  40 #else /* __KERNEL__ */
  41
  42 struct pt_regs {
  43         unsigned long bx;
  44         unsigned long cx;
  45         unsigned long dx;
  46         unsigned long si;
  47         unsigned long di;
  48         unsigned long bp;
  49         unsigned long ax;
  50         unsigned long ds;
  51         unsigned long es;
  52         unsigned long fs;
  53         unsigned long gs;
  54         unsigned long orig_ax;
  55         unsigned long ip;
  56         unsigned long cs;
  57         unsigned long flags;
  58         unsigned long sp;
  59         unsigned long ss;
  60 };
  61
  62 #endif /* __KERNEL__ */
  63
  64 #else /* __i386__ */
  65
  66 #ifndef __KERNEL__
  67
  68 struct pt_regs {
  69         unsigned long r15;
  70         unsigned long r14;
  71         unsigned long r13;
  72         unsigned long r12;
  73         unsigned long rbp;
  74         unsigned long rbx;
  75 /* arguments: non interrupts/non tracing syscalls only save upto here*/
  76         unsigned long r11;
  77         unsigned long r10;
  78         unsigned long r9;
  79         unsigned long r8;
  80         unsigned long rax;
  81         unsigned long rcx;
  82         unsigned long rdx;
  83         unsigned long rsi;
  84         unsigned long rdi;
  85         unsigned long orig_rax;
  86 /* end of arguments */
  87 /* cpu exception frame or undefined */
  88         unsigned long rip;
  89         unsigned long cs;
  90         unsigned long eflags;
  91         unsigned long rsp;
  92         unsigned long ss;
  93 /* top of stack page */
  94 };
  95
  96 #else /* __KERNEL__ */
  97
  98 struct pt_regs {
  99         unsigned long r15;
 100         unsigned long r14;
 101         unsigned long r13;
 102         unsigned long r12;
 103         unsigned long bp;
 104         unsigned long bx;
 105 /* arguments: non interrupts/non tracing syscalls only save upto here*/
 106         unsigned long r11;
 107         unsigned long r10;
 108         unsigned long r9;
 109         unsigned long r8;
 110         unsigned long ax;
 111         unsigned long cx;
 112         unsigned long dx;
 113         unsigned long si;
 114         unsigned long di;
 115         unsigned long orig_ax;
 116 /* end of arguments */
 117 /* cpu exception frame or undefined */
 118         unsigned long ip;
 119         unsigned long cs;
 120         unsigned long flags;
 121         unsigned long sp;
 122         unsigned long ss;
 123 /* top of stack page */
 124 };
 125
 126 #endif /* __KERNEL__ */
 127 #endif /* !__i386__ */
 128
 129
 130 #ifdef __KERNEL__
 131
 132 #include <linux/init.h>
 133
 134 struct cpuinfo_x86;
 135 struct task_struct;
 136
 137 extern unsigned long profile_pc(struct pt_regs *regs);
 138
 139 extern unsigned long
 140 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
 141 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
 142                          int error_code, int si_code);
 143 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
 144
 145 extern long syscall_trace_enter(struct pt_regs *);
 146 extern void syscall_trace_leave(struct pt_regs *);
 147
 148 static inline unsigned long regs_return_value(struct pt_regs *regs)
 149 {
 150         return regs->ax;
 151 }
 152
 153 /*
 154  * user_mode_vm(regs) determines whether a register set came from user mode.
 155  * This is true if V8086 mode was enabled OR if the register set was from
 156  * protected mode with RPL-3 CS value.  This tricky test checks that with
 157  * one comparison.  Many places in the kernel can bypass this full check
 158  * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
 159  */
 160 static inline int user_mode(struct pt_regs *regs)
 161 {
 162 #ifdef CONFIG_X86_32
 163         return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
 164 #else
 165         return !!(regs->cs & 3);
 166 #endif
 167 }
 168
 169 static inline int user_mode_vm(struct pt_regs *regs)
 170 {
 171 #ifdef CONFIG_X86_32
 172         return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
 173                 USER_RPL;
 174 #else
 175         return user_mode(regs);
 176 #endif
 177 }
 178
 179 static inline int v8086_mode(struct pt_regs *regs)
 180 {
 181 #ifdef CONFIG_X86_32
 182         return (regs->flags & X86_VM_MASK);
 183 #else
 184         return 0;       /* No V86 mode support in long mode */
 185 #endif
 186 }
 187
 188 /*
 189  * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
 190  * when it traps.  The previous stack will be directly underneath the saved
 191  * registers, and 'sp/ss' won't even have been saved. Thus the '&regs->sp'.
 192  *
 193  * This is valid only for kernel mode traps.
 194  */
 195 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
 196 {
 197 #ifdef CONFIG_X86_32
 198         return (unsigned long)(&regs->sp);
 199 #else
 200         return regs->sp;
 201 #endif
 202 }
 203
 204 static inline unsigned long instruction_pointer(struct pt_regs *regs)
 205 {
 206         return regs->ip;
 207 }
 208
 209 static inline unsigned long frame_pointer(struct pt_regs *regs)
 210 {
 211         return regs->bp;
 212 }
 213
 214 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
 215 {
 216         return regs->sp;
 217 }
 218
 219 /*
 220  * These are defined as per linux/ptrace.h, which see.
 221  */
 222 #define arch_has_single_step()  (1)
 223 extern void user_enable_single_step(struct task_struct *);
 224 extern void user_disable_single_step(struct task_struct *);
 225
 226 extern void user_enable_block_step(struct task_struct *);
 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 struct user_desc;
 234 extern int do_get_thread_area(struct task_struct *p, int idx,
 235                               struct user_desc __user *info);
 236 extern int do_set_thread_area(struct task_struct *p, int idx,
 237                               struct user_desc __user *info, int can_allocate);
 238
 239 #ifdef CONFIG_X86_PTRACE_BTS
 240 extern void ptrace_bts_untrace(struct task_struct *tsk);
 241
 242 #define arch_ptrace_untrace(tsk)        ptrace_bts_untrace(tsk)
 243 #endif /* CONFIG_X86_PTRACE_BTS */
 244
 245 #endif /* __KERNEL__ */
 246
 247 #endif /* !__ASSEMBLY__ */
 248
 249 #endif /* _ASM_X86_PTRACE_H */