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 #include <asm/page_types.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  xgs;
  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         unsigned long 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 up to 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 up to 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 __KERNEL__
 132
 133 #include <linux/init.h>
 134
 135 struct cpuinfo_x86;
 136 struct task_struct;
 137
 138 extern unsigned long profile_pc(struct pt_regs *regs);
 139 #define profile_pc profile_pc
 140
 141 extern unsigned long
 142 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
 143 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
 144                          int error_code, int si_code);
 145 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
 146
 147 extern long syscall_trace_enter(struct pt_regs *);
 148 extern void syscall_trace_leave(struct pt_regs *);
 149
 150 static inline unsigned long regs_return_value(struct pt_regs *regs)
 151 {
 152         return regs->ax;
 153 }
 154
 155 /*
 156  * user_mode_vm(regs) determines whether a register set came from user mode.
 157  * This is true if V8086 mode was enabled OR if the register set was from
 158  * protected mode with RPL-3 CS value.  This tricky test checks that with
 159  * one comparison.  Many places in the kernel can bypass this full check
 160  * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
 161  */
 162 static inline int user_mode(struct pt_regs *regs)
 163 {
 164 #ifdef CONFIG_X86_32
 165         return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
 166 #else
 167         return !!(regs->cs & 3);
 168 #endif
 169 }
 170
 171 static inline int user_mode_vm(struct pt_regs *regs)
 172 {
 173 #ifdef CONFIG_X86_32
 174         return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
 175                 USER_RPL;
 176 #else
 177         return user_mode(regs);
 178 #endif
 179 }
 180
 181 static inline int v8086_mode(struct pt_regs *regs)
 182 {
 183 #ifdef CONFIG_X86_32
 184         return (regs->flags & X86_VM_MASK);
 185 #else
 186         return 0;       /* No V86 mode support in long mode */
 187 #endif
 188 }
 189
 190 /*
 191  * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
 192  * when it traps.  The previous stack will be directly underneath the saved
 193  * registers, and 'sp/ss' won't even have been saved. Thus the '&regs->sp'.
 194  *
 195  * This is valid only for kernel mode traps.
 196  */
 197 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
 198 {
 199 #ifdef CONFIG_X86_32
 200         return (unsigned long)(&regs->sp);
 201 #else
 202         return regs->sp;
 203 #endif
 204 }
 205
 206 #define GET_IP(regs) ((regs)->ip)
 207 #define GET_FP(regs) ((regs)->bp)
 208 #define GET_USP(regs) ((regs)->sp)
 209
 210 #include <asm-generic/ptrace.h>
 211
 212 /* Query offset/name of register from its name/offset */
 213 extern int regs_query_register_offset(const char *name);
 214 extern const char *regs_query_register_name(unsigned int offset);
 215 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss))
 216
 217 /**
 218  * regs_get_register() - get register value from its offset
 219  * @regs:       pt_regs from which register value is gotten.
 220  * @offset:     offset number of the register.
 221  *
 222  * regs_get_register returns the value of a register. The @offset is the
 223  * offset of the register in struct pt_regs address which specified by @regs.
 224  * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
 225  */
 226 static inline unsigned long regs_get_register(struct pt_regs *regs,
 227                                               unsigned int offset)
 228 {
 229         if (unlikely(offset > MAX_REG_OFFSET))
 230                 return 0;
 231         return *(unsigned long *)((unsigned long)regs + offset);
 232 }
 233
 234 /**
 235  * regs_within_kernel_stack() - check the address in the stack
 236  * @regs:       pt_regs which contains kernel stack pointer.
 237  * @addr:       address which is checked.
 238  *
 239  * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
 240  * If @addr is within the kernel stack, it returns true. If not, returns false.
 241  */
 242 static inline int regs_within_kernel_stack(struct pt_regs *regs,
 243                                            unsigned long addr)
 244 {
 245         return ((addr & ~(THREAD_SIZE - 1))  ==
 246                 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
 247 }
 248
 249 /**
 250  * regs_get_kernel_stack_nth() - get Nth entry of the stack
 251  * @regs:       pt_regs which contains kernel stack pointer.
 252  * @n:          stack entry number.
 253  *
 254  * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
 255  * is specified by @regs. If the @n th entry is NOT in the kernel stack,
 256  * this returns 0.
 257  */
 258 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
 259                                                       unsigned int n)
 260 {
 261         unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
 262         addr += n;
 263         if (regs_within_kernel_stack(regs, (unsigned long)addr))
 264                 return *addr;
 265         else
 266                 return 0;
 267 }
 268
 269 #define arch_has_single_step()  (1)
 270 #ifdef CONFIG_X86_DEBUGCTLMSR
 271 #define arch_has_block_step()   (1)
 272 #else
 273 #define arch_has_block_step()   (boot_cpu_data.x86 >= 6)
 274 #endif
 275
 276 #define ARCH_HAS_USER_SINGLE_STEP_INFO
 277
 278 struct user_desc;
 279 extern int do_get_thread_area(struct task_struct *p, int idx,
 280                               struct user_desc __user *info);
 281 extern int do_set_thread_area(struct task_struct *p, int idx,
 282                               struct user_desc __user *info, int can_allocate);
 283
 284 #endif /* __KERNEL__ */
 285
 286 #endif /* !__ASSEMBLY__ */
 287
 288 #endif /* _ASM_X86_PTRACE_H */