arch/um/include/ptrace_user.h

   1 /*
   2  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #ifndef __PTRACE_USER_H__
   7 #define __PTRACE_USER_H__
   8
   9 #include "sysdep/ptrace_user.h"
  10
  11 extern int ptrace_getregs(long pid, unsigned long *regs_out);
  12 extern int ptrace_setregs(long pid, unsigned long *regs_in);
  13
  14 /* syscall emulation path in ptrace */
  15
  16 #ifndef PTRACE_SYSEMU
  17 #define PTRACE_SYSEMU 31
  18 #endif
  19 #ifndef PTRACE_SYSEMU_SINGLESTEP
  20 #define PTRACE_SYSEMU_SINGLESTEP 32
  21 #endif
  22
  23 /* On architectures, that started to support PTRACE_O_TRACESYSGOOD
  24  * in linux 2.4, there are two different definitions of
  25  * PTRACE_SETOPTIONS: linux 2.4 uses 21 while linux 2.6 uses 0x4200.
  26  * For binary compatibility, 2.6 also supports the old "21", named
  27  * PTRACE_OLDSETOPTION. On these architectures, UML always must use
  28  * "21", to ensure the kernel runs on 2.4 and 2.6 host without
  29  * recompilation. So, we use PTRACE_OLDSETOPTIONS in UML.
  30  * We also want to be able to build the kernel on 2.4, which doesn't
  31  * have PTRACE_OLDSETOPTIONS. So, if it is missing, we declare
  32  * PTRACE_OLDSETOPTIONS to to be the same as PTRACE_SETOPTIONS.
  33  *
  34  * On architectures, that start to support PTRACE_O_TRACESYSGOOD on
  35  * linux 2.6, PTRACE_OLDSETOPTIONS never is defined, and also isn't
  36  * supported by the host kernel. In that case, our trick lets us use
  37  * the new 0x4200 with the name PTRACE_OLDSETOPTIONS.
  38  */
  39 #ifndef PTRACE_OLDSETOPTIONS
  40 #define PTRACE_OLDSETOPTIONS PTRACE_SETOPTIONS
  41 #endif
  42
  43 void set_using_sysemu(int value);
  44 int get_using_sysemu(void);
  45 extern int sysemu_supported;
  46
  47 #define SELECT_PTRACE_OPERATION(sysemu_mode, singlestep_mode) \
  48         (((int[3][3] ) { \
  49                 { PTRACE_SYSCALL, PTRACE_SYSCALL, PTRACE_SINGLESTEP }, \
  50                 { PTRACE_SYSEMU, PTRACE_SYSEMU, PTRACE_SINGLESTEP }, \
  51                 { PTRACE_SYSEMU, PTRACE_SYSEMU_SINGLESTEP, \
  52                   PTRACE_SYSEMU_SINGLESTEP } }) \
  53                 [sysemu_mode][singlestep_mode])
  54
  55 #endif