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
   7
   8 #ifndef __ASSEMBLY__
   9
  10 #ifdef __i386__
  11 /* this struct defines the way the registers are stored on the
  12    stack during a system call. */
  13
  14 #ifndef __KERNEL__
  15
  16 struct pt_regs {
  17         long ebx;
  18         long ecx;
  19         long edx;
  20         long esi;
  21         long edi;
  22         long ebp;
  23         long eax;
  24         int  xds;
  25         int  xes;
  26         int  xfs;
  27         /* int  gs; */
  28         long orig_eax;
  29         long eip;
  30         int  xcs;
  31         long eflags;
  32         long esp;
  33         int  xss;
  34 };
  35
  36 #else /* __KERNEL__ */
  37
  38 struct pt_regs {
  39         unsigned long bx;
  40         unsigned long cx;
  41         unsigned long dx;
  42         unsigned long si;
  43         unsigned long di;
  44         unsigned long bp;
  45         unsigned long ax;
  46         unsigned long ds;
  47         unsigned long es;
  48         unsigned long fs;
  49         /* int  gs; */
  50         unsigned long orig_ax;
  51         unsigned long ip;
  52         unsigned long cs;
  53         unsigned long flags;
  54         unsigned long sp;
  55         unsigned long ss;
  56 };
  57
  58 #include <asm/vm86.h>
  59 #include <asm/segment.h>
  60
  61 #endif /* __KERNEL__ */
  62
  63 #else /* __i386__ */
  64
  65 #ifndef __KERNEL__
  66
  67 struct pt_regs {
  68         unsigned long r15;
  69         unsigned long r14;
  70         unsigned long r13;
  71         unsigned long r12;
  72         unsigned long rbp;
  73         unsigned long rbx;
  74 /* arguments: non interrupts/non tracing syscalls only save upto here*/
  75         unsigned long r11;
  76         unsigned long r10;
  77         unsigned long r9;
  78         unsigned long r8;
  79         unsigned long rax;
  80         unsigned long rcx;
  81         unsigned long rdx;
  82         unsigned long rsi;
  83         unsigned long rdi;
  84         unsigned long orig_rax;
  85 /* end of arguments */
  86 /* cpu exception frame or undefined */
  87         unsigned long rip;
  88         unsigned long cs;
  89         unsigned long eflags;
  90         unsigned long rsp;
  91         unsigned long ss;
  92 /* top of stack page */
  93 };
  94
  95 #else /* __KERNEL__ */
  96
  97 struct pt_regs {
  98         unsigned long r15;
  99         unsigned long r14;
 100         unsigned long r13;
 101         unsigned long r12;
 102         unsigned long bp;
 103         unsigned long bx;
 104 /* arguments: non interrupts/non tracing syscalls only save upto here*/
 105         unsigned long r11;
 106         unsigned long r10;
 107         unsigned long r9;
 108         unsigned long r8;
 109         unsigned long ax;
 110         unsigned long cx;
 111         unsigned long dx;
 112         unsigned long si;
 113         unsigned long di;
 114         unsigned long orig_ax;
 115 /* end of arguments */
 116 /* cpu exception frame or undefined */
 117         unsigned long ip;
 118         unsigned long cs;
 119         unsigned long flags;
 120         unsigned long sp;
 121         unsigned long ss;
 122 /* top of stack page */
 123 };
 124
 125 #endif /* __KERNEL__ */
 126 #endif /* !__i386__ */
 127
 128 #ifdef __KERNEL__
 129
 130 /* the DS BTS struct is used for ptrace as well */
 131 #include <asm/ds.h>
 132
 133 struct task_struct;
 134
 135 extern void ptrace_bts_take_timestamp(struct task_struct *, enum bts_qualifier);
 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
 142 #ifdef CONFIG_X86_32
 143 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
 144                          int error_code);
 145 #else
 146 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
 147 #endif
 148
 149 static inline unsigned long regs_return_value(struct pt_regs *regs)
 150 {
 151         return regs->ax;
 152 }
 153
 154 /*
 155  * user_mode_vm(regs) determines whether a register set came from user mode.
 156  * This is true if V8086 mode was enabled OR if the register set was from
 157  * protected mode with RPL-3 CS value.  This tricky test checks that with
 158  * one comparison.  Many places in the kernel can bypass this full check
 159  * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
 160  */
 161 static inline int user_mode(struct pt_regs *regs)
 162 {
 163 #ifdef CONFIG_X86_32
 164         return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
 165 #else
 166         return !!(regs->cs & 3);
 167 #endif
 168 }
 169
 170 static inline int user_mode_vm(struct pt_regs *regs)
 171 {
 172 #ifdef CONFIG_X86_32
 173         return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & VM_MASK)) >=
 174                 USER_RPL;
 175 #else
 176         return user_mode(regs);
 177 #endif
 178 }
 179
 180 static inline int v8086_mode(struct pt_regs *regs)
 181 {
 182 #ifdef CONFIG_X86_32
 183         return (regs->flags & VM_MASK);
 184 #else
 185         return 0;       /* No V86 mode support in long mode */
 186 #endif
 187 }
 188
 189 /*
 190  * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
 191  * when it traps.  So regs will be the current sp.
 192  *
 193  * This is valid only for kernel mode traps.
 194  */
 195 static inline unsigned long kernel_trap_sp(struct pt_regs *regs)
 196 {
 197 #ifdef CONFIG_X86_32
 198         return (unsigned long)regs;
 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 /*
 215  * These are defined as per linux/ptrace.h, which see.
 216  */
 217 #define arch_has_single_step()  (1)
 218 extern void user_enable_single_step(struct task_struct *);
 219 extern void user_disable_single_step(struct task_struct *);
 220
 221 extern void user_enable_block_step(struct task_struct *);
 222 #ifdef CONFIG_X86_DEBUGCTLMSR
 223 #define arch_has_block_step()   (1)
 224 #else
 225 #define arch_has_block_step()   (boot_cpu_data.x86 >= 6)
 226 #endif
 227
 228 struct user_desc;
 229 extern int do_get_thread_area(struct task_struct *p, int idx,
 230                               struct user_desc __user *info);
 231 extern int do_set_thread_area(struct task_struct *p, int idx,
 232                               struct user_desc __user *info, int can_allocate);
 233
 234 #endif /* __KERNEL__ */
 235
 236 #endif /* !__ASSEMBLY__ */
 237
 238 #endif