linux_syscall_support.h

能把所有线程的数据和环境记录到文件,方便调试.

    #define LSS_ERRNO errno
  #endif

  #undef LSS_INLINE
  #ifdef SYS_INLINE
    #define LSS_INLINE SYS_INLINE
  #else
    #define LSS_INLINE static inline
  #endif

  /* Allow the including file to override the prefix used for all new
   * system calls. By default, it will be set to "sys_".
   */
  #undef LSS_NAME
  #ifndef SYS_PREFIX
    #define LSS_NAME(name) sys_##name
  #elif SYS_PREFIX < 0
    #define LSS_NAME(name) name
  #elif SYS_PREFIX == 0
    #define LSS_NAME(name) sys0_##name
  #elif SYS_PREFIX == 1
    #define LSS_NAME(name) sys1_##name
  #elif SYS_PREFIX == 2
    #define LSS_NAME(name) sys2_##name
  #elif SYS_PREFIX == 3
    #define LSS_NAME(name) sys3_##name
  #elif SYS_PREFIX == 4
    #define LSS_NAME(name) sys4_##name
  #elif SYS_PREFIX == 5
    #define LSS_NAME(name) sys5_##name
  #elif SYS_PREFIX == 6
    #define LSS_NAME(name) sys6_##name
  #elif SYS_PREFIX == 7
    #define LSS_NAME(name) sys7_##name
  #elif SYS_PREFIX == 8
    #define LSS_NAME(name) sys8_##name
  #elif SYS_PREFIX == 9
    #define LSS_NAME(name) sys9_##name
  #endif

  #undef  LSS_RETURN
  #define LSS_RETURN(type, res)                                               \
    do {                                                                      \
      if ((unsigned long)(res) >= (unsigned long)(-4095)) {                   \
        LSS_ERRNO = -(res);                                                   \
        res = -1;                                                             \
      }                                                                       \
      return (type) (res);                                                    \
    } while (0)
  #if defined(__i386__)
    /* In PIC mode (e.g. when building shared libraries), gcc for i386
     * reserves ebx. Unfortunately, most distribution ship with implementations
     * of _syscallX() which clobber ebx.
     * Also, most definitions of _syscallX() neglect to mark "memory" as being
     * clobbered. This causes problems with compilers, that do a better job
     * at optimizing across __asm__ calls.
     * So, we just have to redefine all of the _syscallX() macros.
     */
    #undef  LSS_BODY
    #define LSS_BODY(type,args...)                                            \
      long __res;                                                             \
      __asm__ __volatile__("push %%ebx\n"                                     \
                           "movl %2,%%ebx\n"                                  \
                           "int $0x80\n"                                      \
                           "pop %%ebx"                                        \
                           args                                               \
                           : "memory");                                       \
      LSS_RETURN(type,__res)
    #undef  _syscall0
    #define _syscall0(type,name)                                              \
      type LSS_NAME(name)(void) {                                             \
        long __res;                                                           \
        __asm__ volatile("int $0x80"                                          \
                         : "=a" (__res)                                       \
                         : "0" (__NR_##name)                                  \
                         : "memory");                                         \
        LSS_RETURN(type,__res);                                               \
      }
    #undef  _syscall1
    #define _syscall1(type,name,type1,arg1)                                   \
      type LSS_NAME(name)(type1 arg1) {                                       \
        LSS_BODY(type,                                                        \
             : "=a" (__res)                                                   \
             : "0" (__NR_##name), "ri" ((long)(arg1)));                       \
      }
    #undef  _syscall2
    #define _syscall2(type,name,type1,arg1,type2,arg2)                        \
      type LSS_NAME(name)(type1 arg1,type2 arg2) {                            \
        LSS_BODY(type,                                                        \
             : "=a" (__res)                                                   \
             : "0" (__NR_##name),"ri" ((long)(arg1)), "c" ((long)(arg2)));    \
      }
    #undef  _syscall3
    #define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)             \
      type LSS_NAME(name)(type1 arg1,type2 arg2,type3 arg3) {                 \
        LSS_BODY(type,                                                        \
             : "=a" (__res)                                                   \
             : "0" (__NR_##name), "ri" ((long)(arg1)), "c" ((long)(arg2)),    \
               "d" ((long)(arg3)));                                           \
      }
    #undef  _syscall4
    #define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4)  \
      type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) {   \
        LSS_BODY(type,                                                        \
             : "=a" (__res)                                                   \
             : "0" (__NR_##name), "ri" ((long)(arg1)), "c" ((long)(arg2)),    \
               "d" ((long)(arg3)),"S" ((long)(arg4)));                        \
      }
    #undef  _syscall5
    #define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,  \
                      type5,arg5)                                             \
      type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4,     \
                          type5 arg5) {                                       \
        long __res;                                                           \
        __asm__ __volatile__("push %%ebx\n"                                   \
                             "movl %2,%%ebx\n"                                \
                             "movl %1,%%eax\n"                                \
                             "int  $0x80\n"                                   \
                             "pop  %%ebx"                                     \
                             : "=a" (__res)                                   \
                             : "i" (__NR_##name), "ri" ((long)(arg1)),        \
                               "c" ((long)(arg2)), "d" ((long)(arg3)),        \
                               "S" ((long)(arg4)), "D" ((long)(arg5))         \
                             : "memory");                                     \
        LSS_RETURN(type,__res);                                               \
      }
    #undef  _syscall6
    #define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,  \
                      type5,arg5,type6,arg6)                                  \
      type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4,     \
                          type5 arg5, type6 arg6) {                           \
        long __res;                                                           \
        struct { long __a1; long __a6; } __s = { (long)arg1, (long) arg6 };   \
        __asm__ __volatile__("push %%ebp\n"                                   \
                             "push %%ebx\n"                                   \
                             "movl 4(%2),%%ebp\n"                             \
                             "movl 0(%2), %%ebx\n"                            \
                             "movl %1,%%eax\n"                                \
                             "int  $0x80\n"                                   \
                             "pop  %%ebx\n"                                   \
                             "pop  %%ebp"                                     \
                             : "=a" (__res)                                   \
                             : "i" (__NR_##name),  "0" ((long)(&__s)),        \
                               "c" ((long)(arg2)), "d" ((long)(arg3)),        \
                               "S" ((long)(arg4)), "D" ((long)(arg5))         \
                             : "memory");                                     \
        LSS_RETURN(type,__res);                                               \
      }
    LSS_INLINE int LSS_NAME(clone)(int (*fn)(void *), void *child_stack,
                                   int flags, void *arg, int *parent_tidptr,
                                   void *newtls, int *child_tidptr) {
      long __res;
      __asm__ __volatile__(/* if (fn == NULL)
                            *   return -EINVAL;
                            */
                           "movl   %3,%%ecx\n"
                           "jecxz  1f\n"

                           /* if (child_stack == NULL)
                            *   return -EINVAL;
                            */
                           "movl   %4,%%ecx\n"
                           "jecxz  1f\n"

                           /* Set up alignment of the child stack:
                            * child_stack = (child_stack & ~0xF) - 20;
                            */
                           "andl   $-16,%%ecx\n"
                           "subl   $20,%%ecx\n"

                           /* Push "arg" and "fn" onto the stack that will be
                            * used by the child.
                            */
                           "movl   %6,%%eax\n"
                           "movl   %%eax,4(%%ecx)\n"
                           "movl   %3,%%eax\n"
                           "movl   %%eax,(%%ecx)\n"

                           /* %eax = syscall(%eax = __NR_clone,
                            *                %ebx = flags,
                            *                %ecx = child_stack,
                            *                %edx = parent_tidptr,
                            *                %esi = newtls,
                            *                %edi = child_tidptr)
                            * Also, make sure that %ebx gets preserved as it is
                            * used in PIC mode.
                            */
                           "movl   %8,%%esi\n"
                           "movl   %7,%%edx\n"
                           "movl   %5,%%eax\n"
                           "movl   %9,%%edi\n"
                           "pushl  %%ebx\n"
                           "movl   %%eax,%%ebx\n"
                           "movl   %2,%%eax\n"
                           "int    $0x80\n"

                           /* In the parent: restore %ebx
                            * In the child:  move "fn" into %ebx
                            */
                           "popl   %%ebx\n"

                           /* if (%eax != 0)
                            *   return %eax;
                            */
                           "test   %%eax,%%eax\n"
                           "jnz    1f\n"

                           /* In the child, now. Terminate frame pointer chain.
                            */
                           "movl   $0,%%ebp\n"

                           /* Call "fn". "arg" is already on the stack.
                            */
                           "call   *%%ebx\n"

                           /* Call _exit(%ebx). Unfortunately older versions
                            * of gcc restrict the number of arguments that can
                            * be passed to asm(). So, we need to hard-code the
                            * system call number.
                            */
                           "movl   %%eax,%%ebx\n"
                           "movl   $1,%%eax\n"
                           "int    $0x80\n"

                           /* Return to parent.
                            */
                         "1:\n"
                           : "=a" (__res)
                           : "0"(-EINVAL), "i"(__NR_clone),
                             "m"(fn), "m"(child_stack), "m"(flags), "m"(arg),
                             "m"(parent_tidptr), "m"(newtls), "m"(child_tidptr)
                           : "memory", "ecx", "edx", "esi", "edi");
      LSS_RETURN(int, __res);
    }
  #elif defined(__x86_64__)
    /* There are no known problems with any of the _syscallX() macros
     * currently shipping for x86_64, but we still need to be able to define
     * our own version so that we can override the location of the errno
     * location (e.g. when using the clone() system call with the CLONE_VM
     * option).
     */
    #undef  LSS_BODY
    #define LSS_BODY(type,name, ...)                                          \
          long __res;                                                         \
          __asm__ __volatile__("syscall" : "=a" (__res) : "0" (__NR_##name),  \
            ##__VA_ARGS__ : "r11", "rcx", "memory");                          \
          LSS_RETURN(type, __res)
    #undef _syscall0
    #define _syscall0(type,name)                                              \
      type LSS_NAME(name)() {                                                 \
        LSS_BODY(type, name);                                                 \
      }
    #undef _syscall1
    #define _syscall1(type,name,type1,arg1)                                   \
      type LSS_NAME(name)(type1 arg1) {                                       \
        LSS_BODY(type, name, "D" ((long)(arg1)));                             \
      }
    #undef _syscall2
    #define _syscall2(type,name,type1,arg1,type2,arg2)                        \
      type LSS_NAME(name)(type1 arg1, type2 arg2) {                           \
        LSS_BODY(type, name, "D" ((long)(arg1)), "S" ((long)(arg2)));         \
      }
    #undef _syscall3
    #define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)             \
      type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3) {               \
        LSS_BODY(type, name, "D" ((long)(arg1)), "S" ((long)(arg2)),          \
                             "d" ((long)(arg3)));                             \
      }
    #undef _syscall4
    #define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4)  \
      type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) {   \
          long __res;                                                         \
          __asm__ __volatile__("movq %5,%%r10; syscall" :                     \
            "=a" (__res) : "0" (__NR_##name),                                 \
            "D" ((long)(arg1)), "S" ((long)(arg2)), "d" ((long)(arg3)),       \
            "g" ((long)(arg4)) : "r10", "r11", "rcx", "memory");              \
          LSS_RETURN(type, __res);                                            \
      }
    #undef _syscall5
    #define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,  \
                      type5,arg5)                                             \
      type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4,     \