LXR linux/include/linux/ptrace.h

   1#ifndef _LINUX_PTRACE_H
   2#define _LINUX_PTRACE_H
   3/* ptrace.h */
   4/* structs and defines to help the user use the ptrace system call. */
   5
   6/* has the defines to get at the registers. */
   7
   8#define PTRACE_TRACEME             0
   9#define PTRACE_PEEKTEXT            1
  10#define PTRACE_PEEKDATA            2
  11#define PTRACE_PEEKUSR             3
  12#define PTRACE_POKETEXT            4
  13#define PTRACE_POKEDATA            5
  14#define PTRACE_POKEUSR             6
  15#define PTRACE_CONT                7
  16#define PTRACE_KILL                8
  17#define PTRACE_SINGLESTEP          9
  18
  19#define PTRACE_ATTACH           0x10
  20#define PTRACE_DETACH           0x11
  21
  22#define PTRACE_SYSCALL            24
  23
  24/* 0x4200-0x4300 are reserved for architecture-independent additions.  */
  25#define PTRACE_SETOPTIONS       0x4200
  26#define PTRACE_GETEVENTMSG      0x4201
  27#define PTRACE_GETSIGINFO       0x4202
  28#define PTRACE_SETSIGINFO       0x4203
  29
  30/* options set using PTRACE_SETOPTIONS */
  31#define PTRACE_O_TRACESYSGOOD   0x00000001
  32#define PTRACE_O_TRACEFORK      0x00000002
  33#define PTRACE_O_TRACEVFORK     0x00000004
  34#define PTRACE_O_TRACECLONE     0x00000008
  35#define PTRACE_O_TRACEEXEC      0x00000010
  36#define PTRACE_O_TRACEVFORKDONE 0x00000020
  37#define PTRACE_O_TRACEEXIT      0x00000040
  38
  39#define PTRACE_O_MASK           0x0000007f
  40
  41/* Wait extended result codes for the above trace options.  */
  42#define PTRACE_EVENT_FORK       1
  43#define PTRACE_EVENT_VFORK      2
  44#define PTRACE_EVENT_CLONE      3
  45#define PTRACE_EVENT_EXEC       4
  46#define PTRACE_EVENT_VFORK_DONE 5
  47#define PTRACE_EVENT_EXIT       6
  48
  49#include <asm/ptrace.h>
  50
  51#ifdef __KERNEL__
  52/*
  53 * Ptrace flags
  54 *
  55 * The owner ship rules for task->ptrace which holds the ptrace
  56 * flags is simple.  When a task is running it owns it's task->ptrace
  57 * flags.  When the a task is stopped the ptracer owns task->ptrace.
  58 */
  59
  60#define PT_PTRACED      0x00000001
  61#define PT_DTRACE       0x00000002      /* delayed trace (used on m68k, i386) */
  62#define PT_TRACESYSGOOD 0x00000004
  63#define PT_PTRACE_CAP   0x00000008      /* ptracer can follow suid-exec */
  64#define PT_TRACE_FORK   0x00000010
  65#define PT_TRACE_VFORK  0x00000020
  66#define PT_TRACE_CLONE  0x00000040
  67#define PT_TRACE_EXEC   0x00000080
  68#define PT_TRACE_VFORK_DONE     0x00000100
  69#define PT_TRACE_EXIT   0x00000200
  70#define PT_ATTACHED     0x00000400      /* parent != real_parent */
  71
  72#define PT_TRACE_MASK   0x000003f4
  73
  74/* single stepping state bits (used on ARM and PA-RISC) */
  75#define PT_SINGLESTEP_BIT       31
  76#define PT_SINGLESTEP           (1<<PT_SINGLESTEP_BIT)
  77#define PT_BLOCKSTEP_BIT        30
  78#define PT_BLOCKSTEP            (1<<PT_BLOCKSTEP_BIT)
  79
  80#include <linux/compiler.h>             /* For unlikely.  */
  81#include <linux/sched.h>                /* For struct task_struct.  */
  82
  83
  84extern long arch_ptrace(struct task_struct *child, long request, long addr, long data);
  85extern struct task_struct *ptrace_get_task_struct(pid_t pid);
  86extern int ptrace_traceme(void);
  87extern int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len);
  88extern int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len);
  89extern int ptrace_attach(struct task_struct *tsk);
  90extern int ptrace_detach(struct task_struct *, unsigned int);
  91extern void ptrace_disable(struct task_struct *);
  92extern int ptrace_check_attach(struct task_struct *task, int kill);
  93extern int ptrace_request(struct task_struct *child, long request, long addr, long data);
  94extern void ptrace_notify(int exit_code);
  95extern void __ptrace_link(struct task_struct *child,
  96                          struct task_struct *new_parent);
  97extern void __ptrace_unlink(struct task_struct *child);
  98extern void ptrace_untrace(struct task_struct *child);
  99extern int ptrace_may_attach(struct task_struct *task);
 100
 101static inline void ptrace_link(struct task_struct *child,
 102                               struct task_struct *new_parent)
 103{
 104        if (unlikely(child->ptrace))
 105                __ptrace_link(child, new_parent);
 106}
 107static inline void ptrace_unlink(struct task_struct *child)
 108{
 109        if (unlikely(child->ptrace))
 110                __ptrace_unlink(child);
 111}
 112
 113
 114#ifndef force_successful_syscall_return
 115/*
 116 * System call handlers that, upon successful completion, need to return a
 117 * negative value should call force_successful_syscall_return() right before
 118 * returning.  On architectures where the syscall convention provides for a
 119 * separate error flag (e.g., alpha, ia64, ppc{,64}, sparc{,64}, possibly
 120 * others), this macro can be used to ensure that the error flag will not get
 121 * set.  On architectures which do not support a separate error flag, the macro
 122 * is a no-op and the spurious error condition needs to be filtered out by some
 123 * other means (e.g., in user-level, by passing an extra argument to the
 124 * syscall handler, or something along those lines).
 125 */
 126#define force_successful_syscall_return() do { } while (0)
 127#endif
 128
 129#endif
 130
 131#endif
 132