sandbox/linux/nacl_registers.h

   1 // Copyright 2009 Google Inc. All Rights Reserved.
   2 // Author: neha@google.com (Neha Narula)
   3 //
   4 // Control access to registers.  Provides an abstraction for i386
   5 // vs. x86_64.
   6
   7 #ifndef NATIVE_CLIENT_SANDBOX_LINUX_NACL_REGISTERS_H_
   8 #define NATIVE_CLIENT_SANDBOX_LINUX_NACL_REGISTERS_H_
   9
  10 #include <cstddef>
  11 #include <sys/user.h>
  12 #include <stdint.h>
  13
  14 class Registers {
  15  public:
  16   // Gets the CS register.
  17   static uintptr_t GetCS(const user_regs_struct& regs);
  18   // Gets the syscall userspace is trying to execute.
  19   static uintptr_t GetSyscall(const user_regs_struct& regs);
  20   // Gets the first syscall argument register.
  21   static uintptr_t GetReg1(const user_regs_struct& regs);
  22   // Gets the second syscall argument register.
  23   static uintptr_t GetReg2(const user_regs_struct& regs);
  24   // Gets the third syscall argument register.
  25   static uintptr_t GetReg3(const user_regs_struct& regs);
  26   // Gets the fourth syscall argument register.
  27   static uintptr_t GetReg4(const user_regs_struct& regs);
  28   // Gets the fifth syscall argument register.
  29   static uintptr_t GetReg5(const user_regs_struct& regs);
  30   // Gets the sixth syscall argument register.
  31   static uintptr_t GetReg6(const user_regs_struct& regs);
  32   // Gets the value pointed to as a string
  33   static bool GetStringVal(uintptr_t reg_val, size_t max_length,
  34                            pid_t pid, char* result);
  35
  36   // Sets the first syscall argument register.
  37   static void SetReg1(struct user_regs_struct* regs, uintptr_t val);
  38   // Sets the second syscall argument register.
  39   static void SetReg2(struct user_regs_struct* regs, uintptr_t val);
  40   // Sets the third syscall argument register.
  41   static void SetReg3(struct user_regs_struct* regs, uintptr_t val);
  42   // Sets the fourth syscall argument register.
  43   static void SetReg4(struct user_regs_struct* regs, uintptr_t val);
  44   // Sets the fifth syscall argument register.
  45   static void SetReg5(struct user_regs_struct* regs, uintptr_t val);
  46   // Sets the sixth syscall argument register.
  47   static void SetReg6(struct user_regs_struct* regs, uintptr_t val);
  48 };
  49
  50 #endif  // NATIVE_CLIENT_SANDBOX_LINUX_NACL_REGISTERS_H_