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/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
 131 #ifdef CONFIG_X86_PTRACE_BTS
 132 /* a branch trace record entry
 133  *
 134  * In order to unify the interface between various processor versions,
 135  * we use the below data structure for all processors.
 136  */
 137 enum bts_qualifier {
 138         BTS_INVALID = 0,
 139         BTS_BRANCH,
 140         BTS_TASK_ARRIVES,
 141         BTS_TASK_DEPARTS
 142 };
 143
 144 struct bts_struct {
 145         __u64 qualifier;
 146         union {
 147                 /* BTS_BRANCH */
 148                 struct {
 149                         __u64 from_ip;
 150                         __u64 to_ip;
 151                 } lbr;
 152                 /* BTS_TASK_ARRIVES or
 153                    BTS_TASK_DEPARTS */
 154                 __u64 jiffies;
 155         } variant;
 156 };
 157 #endif /* CONFIG_X86_PTRACE_BTS */
 158
 159 #ifdef __KERNEL__
 160
 161 #include <linux/init.h>
 162
 163 struct cpuinfo_x86;
 164 struct task_struct;
 165
 166 #ifdef CONFIG_X86_PTRACE_BTS
 167 extern void __cpuinit ptrace_bts_init_intel(struct cpuinfo_x86 *);
 168 extern void ptrace_bts_take_timestamp(struct task_struct *, enum bts_qualifier);
 169 #else
 170 #define ptrace_bts_init_intel(config) do {} while (0)
 171 #endif /* CONFIG_X86_PTRACE_BTS */
 172
 173 extern unsigned long profile_pc(struct pt_regs *regs);
 174
 175 extern unsigned long
 176 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
 177 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
 178                          int error_code, int si_code);
 179 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
 180
 181 extern long syscall_trace_enter(struct pt_regs *);
 182 extern void syscall_trace_leave(struct pt_regs *);
 183
 184 static inline unsigned long regs_return_value(struct pt_regs *regs)
 185 {
 186         return regs->ax;
 187 }
 188
 189 /*
 190  * user_mode_vm(regs) determines whether a register set came from user mode.
 191  * This is true if V8086 mode was enabled OR if the register set was from
 192  * protected mode with RPL-3 CS value.  This tricky test checks that with
 193  * one comparison.  Many places in the kernel can bypass this full check
 194  * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
 195  */
 196 static inline int user_mode(struct pt_regs *regs)
 197 {
 198 #ifdef CONFIG_X86_32
 199         return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
 200 #else
 201         return !!(regs->cs & 3);
 202 #endif
 203 }
 204
 205 static inline int user_mode_vm(struct pt_regs *regs)
 206 {
 207 #ifdef CONFIG_X86_32
 208         return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
 209                 USER_RPL;
 210 #else
 211         return user_mode(regs);
 212 #endif
 213 }
 214
 215 static inline int v8086_mode(struct pt_regs *regs)
 216 {
 217 #ifdef CONFIG_X86_32
 218         return (regs->flags & X86_VM_MASK);
 219 #else
 220         return 0;       /* No V86 mode support in long mode */
 221 #endif
 222 }
 223
 224 /*
 225  * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
 226  * when it traps.  So regs will be the current sp.
 227  *
 228  * This is valid only for kernel mode traps.
 229  */
 230 static inline unsigned long kernel_trap_sp(struct pt_regs *regs)
 231 {
 232 #ifdef CONFIG_X86_32
 233         return (unsigned long)regs;
 234 #else
 235         return regs->sp;
 236 #endif
 237 }
 238
 239 static inline unsigned long instruction_pointer(struct pt_regs *regs)
 240 {
 241         return regs->ip;
 242 }
 243
 244 static inline unsigned long frame_pointer(struct pt_regs *regs)
 245 {
 246         return regs->bp;
 247 }
 248
 249 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
 250 {
 251         return regs->sp;
 252 }
 253
 254 /*
 255  * These are defined as per linux/ptrace.h, which see.
 256  */
 257 #define arch_has_single_step()  (1)
 258 extern void user_enable_single_step(struct task_struct *);
 259 extern void user_disable_single_step(struct task_struct *);
 260
 261 extern void user_enable_block_step(struct task_struct *);
 262 #ifdef CONFIG_X86_DEBUGCTLMSR
 263 #define arch_has_block_step()   (1)
 264 #else
 265 #define arch_has_block_step()   (boot_cpu_data.x86 >= 6)
 266 #endif
 267
 268 struct user_desc;
 269 extern int do_get_thread_area(struct task_struct *p, int idx,
 270                               struct user_desc __user *info);
 271 extern int do_set_thread_area(struct task_struct *p, int idx,
 272                               struct user_desc __user *info, int can_allocate);
 273
 274 #define __ARCH_WANT_COMPAT_SYS_PTRACE
 275
 276 #endif /* __KERNEL__ */
 277
 278 #endif /* !__ASSEMBLY__ */
 279
 280 #endif /* _ASM_X86_PTRACE_H */