include/asm-x86/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/ds.h>             /* the DS BTS struct is used for ptrace too */
  10 #include <asm/segment.h>
  11 #endif
  12
  13 #ifndef __ASSEMBLY__
  14
  15 #ifdef __i386__
  16 /* this struct defines the way the registers are stored on the
  17    stack during a system call. */
  18
  19 #ifndef __KERNEL__
  20
  21 struct pt_regs {
  22         long ebx;
  23         long ecx;
  24         long edx;
  25         long esi;
  26         long edi;
  27         long ebp;
  28         long eax;
  29         int  xds;
  30         int  xes;
  31         int  xfs;
  32         /* int  gs; */
  33         long orig_eax;
  34         long eip;
  35         int  xcs;
  36         long eflags;
  37         long esp;
  38         int  xss;
  39 };
  40
  41 #else /* __KERNEL__ */
  42
  43 struct pt_regs {
  44         unsigned long bx;
  45         unsigned long cx;
  46         unsigned long dx;
  47         unsigned long si;
  48         unsigned long di;
  49         unsigned long bp;
  50         unsigned long ax;
  51         unsigned long ds;
  52         unsigned long es;
  53         unsigned long fs;
  54         /* int  gs; */
  55         unsigned long orig_ax;
  56         unsigned long ip;
  57         unsigned long cs;
  58         unsigned long flags;
  59         unsigned long sp;
  60         unsigned long ss;
  61 };
  62
  63 #endif /* __KERNEL__ */
  64
  65 #else /* __i386__ */
  66
  67 #ifndef __KERNEL__
  68
  69 struct pt_regs {
  70         unsigned long r15;
  71         unsigned long r14;
  72         unsigned long r13;
  73         unsigned long r12;
  74         unsigned long rbp;
  75         unsigned long rbx;
  76 /* arguments: non interrupts/non tracing syscalls only save upto here*/
  77         unsigned long r11;
  78         unsigned long r10;
  79         unsigned long r9;
  80         unsigned long r8;
  81         unsigned long rax;
  82         unsigned long rcx;
  83         unsigned long rdx;
  84         unsigned long rsi;
  85         unsigned long rdi;
  86         unsigned long orig_rax;
  87 /* end of arguments */
  88 /* cpu exception frame or undefined */
  89         unsigned long rip;
  90         unsigned long cs;
  91         unsigned long eflags;
  92         unsigned long rsp;
  93         unsigned long ss;
  94 /* top of stack page */
  95 };
  96
  97 #else /* __KERNEL__ */
  98
  99 struct pt_regs {
 100         unsigned long r15;
 101         unsigned long r14;
 102         unsigned long r13;
 103         unsigned long r12;
 104         unsigned long bp;
 105         unsigned long bx;
 106 /* arguments: non interrupts/non tracing syscalls only save upto here*/
 107         unsigned long r11;
 108         unsigned long r10;
 109         unsigned long r9;
 110         unsigned long r8;
 111         unsigned long ax;
 112         unsigned long cx;
 113         unsigned long dx;
 114         unsigned long si;
 115         unsigned long di;
 116         unsigned long orig_ax;
 117 /* end of arguments */
 118 /* cpu exception frame or undefined */
 119         unsigned long ip;
 120         unsigned long cs;
 121         unsigned long flags;
 122         unsigned long sp;
 123         unsigned long ss;
 124 /* top of stack page */
 125 };
 126
 127 #endif /* __KERNEL__ */
 128 #endif /* !__i386__ */
 129
 130 #ifdef __KERNEL__
 131
 132 /* the DS BTS struct is used for ptrace as well */
 133 #include <asm/ds.h>
 134
 135 struct task_struct;
 136
 137 extern void ptrace_bts_take_timestamp(struct task_struct *, enum bts_qualifier);
 138
 139 extern unsigned long profile_pc(struct pt_regs *regs);
 140
 141 extern unsigned long
 142 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
 143
 144 #ifdef CONFIG_X86_32
 145 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
 146                          int error_code);
 147 #else
 148 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
 149 #endif
 150
 151 extern long syscall_trace_enter(struct pt_regs *);
 152 extern void syscall_trace_leave(struct pt_regs *);
 153
 154 static inline unsigned long regs_return_value(struct pt_regs *regs)
 155 {
 156         return regs->ax;
 157 }
 158
 159 /*
 160  * user_mode_vm(regs) determines whether a register set came from user mode.
 161  * This is true if V8086 mode was enabled OR if the register set was from
 162  * protected mode with RPL-3 CS value.  This tricky test checks that with
 163  * one comparison.  Many places in the kernel can bypass this full check
 164  * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
 165  */
 166 static inline int user_mode(struct pt_regs *regs)
 167 {
 168 #ifdef CONFIG_X86_32
 169         return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
 170 #else
 171         return !!(regs->cs & 3);
 172 #endif
 173 }
 174
 175 static inline int user_mode_vm(struct pt_regs *regs)
 176 {
 177 #ifdef CONFIG_X86_32
 178         return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
 179                 USER_RPL;
 180 #else
 181         return user_mode(regs);
 182 #endif
 183 }
 184
 185 static inline int v8086_mode(struct pt_regs *regs)
 186 {
 187 #ifdef CONFIG_X86_32
 188         return (regs->flags & X86_VM_MASK);
 189 #else
 190         return 0;       /* No V86 mode support in long mode */
 191 #endif
 192 }
 193
 194 /*
 195  * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
 196  * when it traps.  So regs will be the current sp.
 197  *
 198  * This is valid only for kernel mode traps.
 199  */
 200 static inline unsigned long kernel_trap_sp(struct pt_regs *regs)
 201 {
 202 #ifdef CONFIG_X86_32
 203         return (unsigned long)regs;
 204 #else
 205         return regs->sp;
 206 #endif
 207 }
 208
 209 static inline unsigned long instruction_pointer(struct pt_regs *regs)
 210 {
 211         return regs->ip;
 212 }
 213
 214 static inline unsigned long frame_pointer(struct pt_regs *regs)
 215 {
 216         return regs->bp;
 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 #define __ARCH_WANT_COMPAT_SYS_PTRACE
 240
 241 #endif /* __KERNEL__ */
 242
 243 #endif /* !__ASSEMBLY__ */
 244
 245 #endif /* ASM_X86__PTRACE_H */