由于Linux内核运行在受保护的地址空间上，系统中的用户空间程序无法直接跳转到内核代码执行，也就是由于权限的限制，用户程序不能直接调用内核的函数，因此，需要一种机制使应用程序可以某种方式通知内核，使应用程序的执行流进入内核态，这样内核就可以代表应用程序在内核空间执行系统调用。这有点像机场的安检通道，旅客不但只能通过有限的几个通道进入，还要经过严格的安全检查。
但是，安全和效率往往是一体两面，在linux内核中发起一个系统调用是特别昂贵的操作，因为处理器需要中断当前正在执行的任务，执行一系列的操作才能执行真正调用的函数，这些操作包括切换CPU运行模式，陷入内核，保存用户现场，可以看到是非常复杂的。针对这种情况，vsyscall和vdso被设计用来加速系统调用处理。我们先分析一下vsyscall.
vsyscall
vsyscall或virtual system call是一种用于加速系统调用的机制，vsyscall的工作原理其实非常简单，linux内核在用户空间映射一个包含一些变量以及一些系统调用代码实现的内存页，这个页面虽然映射在内核空间，但是可以允许从用户空间直接访问，这样避免了透过用户态运行库进行系统调用的开销。对于X86_64架构可以在Linux内核文档中找到关于这一内存区的细节：
Documentation/x86/x86_64/mm.rst
为什么是ffffffffff600000-ffffffffff601000，这个答案可以在内核中找到。
#include <stdio.h>
#include <stdlib.h>
#define VSYSCALL_ADDR (-10UL << 20)
int main(void)
{
printf("%s line %d, VSYSCALL_ADDR=0x%lx.\n", __func__, __LINE__, VSYSCALL_ADDR);
return 0;
}
内核中的处理过程
start_kernel
\___setup_arch
\___map_vsyscall
\___ __set_fix_map(VSYSCALL_PAGE,...)
\___native_set_fixmap
\___ __native_set_fixmap(idx,...)
\___set_pte_vaddr(address, pte);arch/x86/entry/vsyscall/vsyscall_64.c:
map_vsyscall函数的实现依赖于内核配置选项CONFIG_X86_VSYSCALL_EMULATION
为何是模拟vsyscall?事实上，由于历史原因，vsyscall是一种遗留ABI，vsyscall调用具有绑定的地址，意味着vsyscall的内存页的位置在任何时刻是相同的，这一位置是在上面的头文件中由VSYSCALL_ADDR宏定义的，在map_vsyscall函数的开始，通过宏__pa_symbol获取了vsyscall内存页的物理地址，__vsyscall_page在arch/x86/entry/vsyscall/vsyscall_emu_64.S中定义，具有如下的虚拟地址。
其中包含了用户态最常用的三个系统调用gettimeofday, time, getcpu.注意虚拟系统调用的地址以1024 byte对齐,中间填充0xcc(int3指令).因为要放在一个独立的页面中，映射，要求vsyscall页面按PAGE对齐：
vsyscall内存页的起始地址为0xffffffffff600000,因此，用户态LIBC知道所有的虚拟系统调用的地址，可以在LIBC源码中找到这些地址的定义：
回到map_vsyscall函数及__vsysall_page的实现，在得到__vsyscall_page的物理地址后，再进行映射。map_vsyscall映射时，会判断vsyscall_mode变量，根据模式的不同，选择不同的映射属性。
vsyscall_mode在系统启动阶段通过命令行参数初始化：
如果vsyscall_mode被设置为映射的vsyscall页面不允许执行，则用户态通过vsyscall table发起的三个系统调用会产生PAGE FAULT，在vsyscall_64.c中，page fault会调用emulate_vsyscall函数对VSYSCALL进行模拟：
__do_page_fault->do_user_addr_fault->emulate_vsyscall: 
GDB DUMP VSYSCALL代码
如下方式使用GDB DUMP代码失败，因为映射的VSYSCALL页面不可读。
这是由于默认在内核启动时vsyscall_mode被设置成了XONLY
而我们可以在启动阶段传入命令行参数，修改/etc/default/grub将 vsyscall_mode设置为emulate,之后update grub.
还有一步需要注意，我们需要修改vsyscall的映射属性，因为默认的emulate仍然是不可读的，会触发page fault由emulate_vsyscall来模拟的路径，vsyscall page的映射属性由宏PAGE_KERNEL_VVAR控制，我们按照下图修改,重新编译内核：
之后重新修改编译内核，用新的内核启动系统,可以看到，修改成功：
再次DUMP,这次成功拿到vsyscall镜像：
反编译VSYSCALL页面：
objdump -b binary -Mintel,x86-64,addr64 -m i386:x86-64 --adjust-vma=0xffffffffff600000 -D vsyscall.bin
可以看到，从实际的VSYSCALL页面DUMP出来的三个系统调用地址分配在0xffffffffff600000,ffffffffff600400,0xffffffffff600800.和预期相符。
vsyscall.bin： 文件格式 binary
Disassembly of section .data:
ffffffffff600000 <.data>:
ffffffffff600000: 48 c7 c0 60 00 00 00 mov rax,0x60
ffffffffff600007: 0f 05 syscall
ffffffffff600009: c3 ret
ffffffffff60000a: cc int3
ffffffffff60000b: cc int3
ffffffffff60000c: cc int3
ffffffffff60000d: cc int3
ffffffffff60000e: cc int3
ffffffffff60000f: cc int3
ffffffffff600010: cc int3
ffffffffff600011: cc int3
ffffffffff600012: cc int3
ffffffffff600013: cc int3
ffffffffff600014: cc int3
ffffffffff600015: cc int3
ffffffffff600016: cc int3
ffffffffff600017: cc int3
ffffffffff600018: cc int3
ffffffffff600019: cc int3
ffffffffff60001a: cc int3
ffffffffff60001b: cc int3
ffffffffff60001c: cc int3
ffffffffff60001d: cc int3
ffffffffff60001e: cc int3
ffffffffff60001f: cc int3
ffffffffff600020: cc int3
ffffffffff600021: cc int3
ffffffffff600022: cc int3
ffffffffff600023: cc int3
ffffffffff600024: cc int3
ffffffffff600025: cc int3
ffffffffff600026: cc int3
ffffffffff600027: cc int3
ffffffffff600028: cc int3
ffffffffff600029: cc int3
ffffffffff60002a: cc int3
ffffffffff60002b: cc int3
ffffffffff60002c: cc int3
ffffffffff60002d: cc int3
ffffffffff60002e: cc int3
ffffffffff60002f: cc int3
ffffffffff600030: cc int3
ffffffffff600031: cc int3
ffffffffff600032: cc int3
ffffffffff600033: cc int3
ffffffffff600034: cc int3
ffffffffff600035: cc int3
ffffffffff600036: cc int3
ffffffffff600037: cc int3
ffffffffff600038: cc int3
ffffffffff600039: cc int3
ffffffffff60003a: cc int3
ffffffffff60003b: cc int3
ffffffffff60003c: cc int3
ffffffffff60003d: cc int3
ffffffffff60003e: cc int3
ffffffffff60003f: cc int3
ffffffffff600040: cc int3
ffffffffff600041: cc int3
ffffffffff600042: cc int3
ffffffffff600043: cc int3
ffffffffff600044: cc int3
ffffffffff600045: cc int3
ffffffffff600046: cc int3
ffffffffff600047: cc int3
ffffffffff600048: cc int3
ffffffffff600049: cc int3
ffffffffff60004a: cc int3
ffffffffff60004b: cc int3
ffffffffff60004c: cc int3
ffffffffff60004d: cc int3
ffffffffff60004e: cc int3
ffffffffff60004f: cc int3
ffffffffff600050: cc int3
ffffffffff600051: cc int3
ffffffffff600052: cc int3
ffffffffff600053: cc int3
ffffffffff600054: cc int3
ffffffffff600055: cc int3
ffffffffff600056: cc int3
ffffffffff600057: cc int3
ffffffffff600058: cc int3
ffffffffff600059: cc int3
ffffffffff60005a: cc int3
ffffffffff60005b: cc int3
ffffffffff60005c: cc int3
ffffffffff60005d: cc int3
ffffffffff60005e: cc int3
ffffffffff60005f: cc int3
ffffffffff600060: cc int3
ffffffffff600061: cc int3
ffffffffff600062: cc int3
ffffffffff600063: cc int3
ffffffffff600064: cc int3
ffffffffff600065: cc int3
ffffffffff600066: cc int3
ffffffffff600067: cc int3
ffffffffff600068: cc int3
ffffffffff600069: cc int3
ffffffffff60006a: cc int3
ffffffffff60006b: cc int3
ffffffffff60006c: cc int3
ffffffffff60006d: cc int3
ffffffffff60006e: cc int3
ffffffffff60006f: cc int3
ffffffffff600070: cc int3
ffffffffff600071: cc int3
ffffffffff600072: cc int3
ffffffffff600073: cc int3
ffffffffff600074: cc int3
ffffffffff600075: cc int3
ffffffffff600076: cc int3
ffffffffff600077: cc int3
ffffffffff600078: cc int3
ffffffffff600079: cc int3
ffffffffff60007a: cc int3
ffffffffff60007b: cc int3
ffffffffff60007c: cc int3
ffffffffff60007d: cc int3
ffffffffff60007e: cc int3
ffffffffff60007f: cc int3
ffffffffff600080: cc int3
ffffffffff600081: cc int3
ffffffffff600082: cc int3
ffffffffff600083: cc int3
ffffffffff600084: cc int3
ffffffffff600085: cc int3
ffffffffff600086: cc int3
ffffffffff600087: cc int3
ffffffffff600088: cc int3
ffffffffff600089: cc int3
ffffffffff60008a: cc int3
ffffffffff60008b: cc int3
ffffffffff60008c: cc int3
ffffffffff60008d: cc int3
ffffffffff60008e: cc int3
ffffffffff60008f: cc int3
ffffffffff600090: cc int3
ffffffffff600091: cc int3
ffffffffff600092: cc int3
ffffffffff600093: cc int3
ffffffffff600094: cc int3
ffffffffff600095: cc int3
ffffffffff600096: cc int3
ffffffffff600097: cc int3
ffffffffff600098: cc int3
ffffffffff600099: cc int3
ffffffffff60009a: cc int3
ffffffffff60009b: cc int3
ffffffffff60009c: cc int3
ffffffffff60009d: cc int3
ffffffffff60009e: cc int3
ffffffffff60009f: cc int3
ffffffffff6000a0: cc int3
ffffffffff6000a1: cc int3
ffffffffff6000a2: cc int3
ffffffffff6000a3: cc int3
ffffffffff6000a4: cc int3
ffffffffff6000a5: cc int3
ffffffffff6000a6: cc int3
ffffffffff6000a7: cc int3
ffffffffff6000a8: cc int3
ffffffffff6000a9: cc int3
ffffffffff6000aa: cc int3
ffffffffff6000ab: cc int3
ffffffffff6000ac: cc int3
ffffffffff6000ad: cc int3
ffffffffff6000ae: cc int3
ffffffffff6000af: cc int3
ffffffffff6000b0: cc int3
ffffffffff6000b1: cc int3
ffffffffff6000b2: cc int3
ffffffffff6000b3: cc int3
ffffffffff6000b4: cc int3
ffffffffff6000b5: cc int3
ffffffffff6000b6: cc int3
ffffffffff6000b7: cc int3
ffffffffff6000b8: cc int3
ffffffffff6000b9: cc int3
ffffffffff6000ba: cc int3
ffffffffff6000bb: cc int3
ffffffffff6000bc: cc int3
ffffffffff6000bd: cc int3
ffffffffff6000be: cc int3
ffffffffff6000bf: cc int3
ffffffffff6000c0: cc int3
ffffffffff6000c1: cc int3
ffffffffff6000c2: cc int3
ffffffffff6000c3: cc int3
ffffffffff6000c4: cc int3
ffffffffff6000c5: cc int3
ffffffffff6000c6: cc int3
ffffffffff6000c7: cc int3
ffffffffff6000c8: cc int3
ffffffffff6000c9: cc int3
ffffffffff6000ca: cc int3
ffffffffff6000cb: cc int3
ffffffffff6000cc: cc int3
ffffffffff6000cd: cc int3
ffffffffff6000ce: cc int3
ffffffffff6000cf: cc int3
ffffffffff6000d0: cc int3
ffffffffff6000d1: cc int3
ffffffffff6000d2: cc int3
ffffffffff6000d3: cc int3
ffffffffff6000d4: cc int3
ffffffffff6000d5: cc int3
ffffffffff6000d6: cc int3
ffffffffff6000d7: cc int3
ffffffffff6000d8: cc int3
ffffffffff6000d9: cc int3
ffffffffff6000da: cc int3
ffffffffff6000db: cc int3
ffffffffff6000dc: cc int3
ffffffffff6000dd: cc int3
ffffffffff6000de: cc int3
ffffffffff6000df: cc int3
ffffffffff6000e0: cc int3
ffffffffff6000e1: cc int3
ffffffffff6000e2: cc int3
ffffffffff6000e3: cc int3
ffffffffff6000e4: cc int3
ffffffffff6000e5: cc int3
ffffffffff6000e6: cc int3
ffffffffff6000e7: cc int3
ffffffffff6000e8: cc int3
ffffffffff6000e9: cc int3
ffffffffff6000ea: cc int3
ffffffffff6000eb: cc int3
ffffffffff6000ec: cc int3
ffffffffff6000ed: cc int3
ffffffffff6000ee: cc int3
ffffffffff6000ef: cc int3
ffffffffff6000f0: cc int3
ffffffffff6000f1: cc int3
ffffffffff6000f2: cc int3
ffffffffff6000f3: cc int3
ffffffffff6000f4: cc int3
ffffffffff6000f5: cc int3
ffffffffff6000f6: cc int3
ffffffffff6000f7: cc int3
ffffffffff6000f8: cc int3
ffffffffff6000f9: cc int3
ffffffffff6000fa: cc int3
ffffffffff6000fb: cc int3
ffffffffff6000fc: cc int3
ffffffffff6000fd: cc int3
ffffffffff6000fe: cc int3
ffffffffff6000ff: cc int3
ffffffffff600100: cc int3
ffffffffff600101: cc int3
ffffffffff600102: cc int3
ffffffffff600103: cc int3
ffffffffff600104: cc int3
ffffffffff600105: cc int3
ffffffffff600106: cc int3
ffffffffff600107: cc int3
ffffffffff600108: cc int3
ffffffffff600109: cc int3
ffffffffff60010a: cc int3
ffffffffff60010b: cc int3
ffffffffff60010c: cc int3
ffffffffff60010d: cc int3
ffffffffff60010e: cc int3
ffffffffff60010f: cc int3
ffffffffff600110: cc int3
ffffffffff600111: cc int3
ffffffffff600112: cc int3
ffffffffff600113: cc int3
ffffffffff600114: cc int3
ffffffffff600115: cc int3
ffffffffff600116: cc int3
ffffffffff600117: cc int3
ffffffffff600118: cc int3
ffffffffff600119: cc int3
ffffffffff60011a: cc int3
ffffffffff60011b: cc int3
ffffffffff60011c: cc int3
ffffffffff60011d: cc int3
ffffffffff60011e: cc int3
ffffffffff60011f: cc int3
ffffffffff600120: cc int3
ffffffffff600121: cc int3
ffffffffff600122: cc int3
ffffffffff600123: cc int3
ffffffffff600124: cc int3
ffffffffff600125: cc int3
ffffffffff600126: cc int3
ffffffffff600127: cc int3
ffffffffff600128: cc int3
ffffffffff600129: cc int3
ffffffffff60012a: cc int3
ffffffffff60012b: cc int3
ffffffffff60012c: cc int3
ffffffffff60012d: cc int3
ffffffffff60012e: cc int3
ffffffffff60012f: cc int3
ffffffffff600130: cc int3
ffffffffff600131: cc int3
ffffffffff600132: cc int3
ffffffffff600133: cc int3
ffffffffff600134: cc int3
ffffffffff600135: cc int3
ffffffffff600136: cc int3
ffffffffff600137: cc int3
ffffffffff600138: cc int3
ffffffffff600139: cc int3
ffffffffff60013a: cc int3
ffffffffff60013b: cc int3
ffffffffff60013c: cc int3
ffffffffff60013d: cc int3
ffffffffff60013e: cc int3
ffffffffff60013f: cc int3
ffffffffff600140: cc int3
ffffffffff600141: cc int3
ffffffffff600142: cc int3
ffffffffff600143: cc int3
ffffffffff600144: cc int3
ffffffffff600145: cc int3
ffffffffff600146: cc int3
ffffffffff600147: cc int3
ffffffffff600148: cc int3
ffffffffff600149: cc int3
ffffffffff60014a: cc int3
ffffffffff60014b: cc int3
ffffffffff60014c: cc int3
ffffffffff60014d: cc int3
ffffffffff60014e: cc int3
ffffffffff60014f: cc int3
ffffffffff600150: cc int3
ffffffffff600151: cc int3
ffffffffff600152: cc int3
ffffffffff600153: cc int3
ffffffffff600154: cc int3
ffffffffff600155: cc int3
ffffffffff600156: cc int3
ffffffffff600157: cc int3
ffffffffff600158: cc int3
ffffffffff600159: cc int3
ffffffffff60015a: cc int3
ffffffffff60015b: cc int3
ffffffffff60015c: cc int3
ffffffffff60015d: cc int3
ffffffffff60015e: cc int3
ffffffffff60015f: cc int3
ffffffffff600160: cc int3
ffffffffff600161: cc int3
ffffffffff600162: cc int3
ffffffffff600163: cc int3
ffffffffff600164: cc int3
ffffffffff600165: cc int3
ffffffffff600166: cc int3
ffffffffff600167: cc int3
ffffffffff600168: cc int3
ffffffffff600169: cc int3
ffffffffff60016a: cc int3
ffffffffff60016b: cc int3
ffffffffff60016c: cc int3
ffffffffff60016d: cc int3
ffffffffff60016e: cc int3
ffffffffff60016f: cc int3
ffffffffff600170: cc int3
ffffffffff600171: cc int3
ffffffffff600172: cc int3
ffffffffff600173: cc int3
ffffffffff600174: cc int3
ffffffffff600175: cc int3
ffffffffff600176: cc int3
ffffffffff600177: cc int3
ffffffffff600178: cc int3
ffffffffff600179: cc int3
ffffffffff60017a: cc int3
ffffffffff60017b: cc int3
ffffffffff60017c: cc int3
ffffffffff60017d: cc int3
ffffffffff60017e: cc int3
ffffffffff60017f: cc int3
ffffffffff600180: cc int3
ffffffffff600181: cc int3
ffffffffff600182: cc int3
ffffffffff600183: cc int3
ffffffffff600184: cc int3
ffffffffff600185: cc int3
ffffffffff600186: cc int3
ffffffffff600187: cc int3
ffffffffff600188: cc int3
ffffffffff600189: cc int3
ffffffffff60018a: cc int3
ffffffffff60018b: cc int3
ffffffffff60018c: cc int3
ffffffffff60018d: cc int3
ffffffffff60018e: cc int3
ffffffffff60018f: cc int3
ffffffffff600190: cc int3
ffffffffff600191: cc int3
ffffffffff600192: cc int3
ffffffffff600193: cc int3
ffffffffff600194: cc int3
ffffffffff600195: cc int3
ffffffffff600196: cc int3
ffffffffff600197: cc int3
ffffffffff600198: cc int3
ffffffffff600199: cc int3
ffffffffff60019a: cc int3
ffffffffff60019b: cc int3
ffffffffff60019c: cc int3
ffffffffff60019d: cc int3
ffffffffff60019e: cc int3
ffffffffff60019f: cc int3
ffffffffff6001a0: cc int3
ffffffffff6001a1: cc int3
ffffffffff6001a2: cc int3
ffffffffff6001a3: cc int3
ffffffffff6001a4: cc int3
ffffffffff6001a5: cc int3
ffffffffff6001a6: cc int3
ffffffffff6001a7: cc int3
ffffffffff6001a8: cc int3
ffffffffff6001a9: cc int3
ffffffffff6001aa: cc int3
ffffffffff6001ab: cc int3
ffffffffff6001ac: cc int3
ffffffffff6001ad: cc int3
ffffffffff6001ae: cc int3
ffffffffff6001af: cc int3
ffffffffff6001b0: cc int3
ffffffffff6001b1: cc int3
ffffffffff6001b2: cc int3
ffffffffff6001b3: cc int3
ffffffffff6001b4: cc int3
ffffffffff6001b5: cc int3
ffffffffff6001b6: cc int3
ffffffffff6001b7: cc int3
ffffffffff6001b8: cc int3
ffffffffff6001b9: cc int3
ffffffffff6001ba: cc int3
ffffffffff6001bb: cc int3
ffffffffff6001bc: cc int3
ffffffffff6001bd: cc int3
ffffffffff6001be: cc int3
ffffffffff6001bf: cc int3
ffffffffff6001c0: cc int3
ffffffffff6001c1: cc int3
ffffffffff6001c2: cc int3
ffffffffff6001c3: cc int3
ffffffffff6001c4: cc int3
ffffffffff6001c5: cc int3
ffffffffff6001c6: cc int3
ffffffffff6001c7: cc int3
ffffffffff6001c8: cc int3
ffffffffff6001c9: cc int3
ffffffffff6001ca: cc int3
ffffffffff6001cb: cc int3
ffffffffff6001cc: cc int3
ffffffffff6001cd: cc int3
ffffffffff6001ce: cc int3
ffffffffff6001cf: cc int3
ffffffffff6001d0: cc int3
ffffffffff6001d1: cc int3
ffffffffff6001d2: cc int3
ffffffffff6001d3: cc int3
ffffffffff6001d4: cc int3
ffffffffff6001d5: cc int3
ffffffffff6001d6: cc int3
ffffffffff6001d7: cc int3
ffffffffff6001d8: cc int3
ffffffffff6001d9: cc int3
ffffffffff6001da: cc int3
ffffffffff6001db: cc int3
ffffffffff6001dc: cc int3
ffffffffff6001dd: cc int3
ffffffffff6001de: cc int3
ffffffffff6001df: cc int3
ffffffffff6001e0: cc int3
ffffffffff6001e1: cc int3
ffffffffff6001e2: cc int3
ffffffffff6001e3: cc int3
ffffffffff6001e4: cc int3
ffffffffff6001e5: cc int3
ffffffffff6001e6: cc int3
ffffffffff6001e7: cc int3
ffffffffff6001e8: cc int3
ffffffffff6001e9: cc int3
ffffffffff6001ea: cc int3
ffffffffff6001eb: cc int3
ffffffffff6001ec: cc int3
ffffffffff6001ed: cc int3
ffffffffff6001ee: cc int3
ffffffffff6001ef: cc int3
ffffffffff6001f0: cc int3
ffffffffff6001f1: cc int3
ffffffffff6001f2: cc int3
ffffffffff6001f3: cc int3
ffffffffff6001f4: cc int3
ffffffffff6001f5: cc int3
ffffffffff6001f6: cc int3
ffffffffff6001f7: cc int3
ffffffffff6001f8: cc int3
ffffffffff6001f9: cc int3
ffffffffff6001fa: cc int3
ffffffffff6001fb: cc int3
ffffffffff6001fc: cc int3
ffffffffff6001fd: cc int3
ffffffffff6001fe: cc int3
ffffffffff6001ff: cc int3
ffffffffff600200: cc int3
ffffffffff600201: cc int3
ffffffffff600202: cc int3
ffffffffff600203: cc int3
ffffffffff600204: cc int3
ffffffffff600205: cc int3
ffffffffff600206: cc int3
ffffffffff600207: cc int3
ffffffffff600208: cc int3
ffffffffff600209: cc int3
ffffffffff60020a: cc int3
ffffffffff60020b: cc int3
ffffffffff60020c: cc int3
ffffffffff60020d: cc int3
ffffffffff60020e: cc int3
ffffffffff60020f: cc int3
ffffffffff600210: cc int3
ffffffffff600211: cc int3
ffffffffff600212: cc int3
ffffffffff600213: cc int3
ffffffffff600214: cc int3
ffffffffff600215: cc int3
ffffffffff600216: cc int3
ffffffffff600217: cc int3
ffffffffff600218: cc int3
ffffffffff600219: cc int3
ffffffffff60021a: cc int3
ffffffffff60021b: cc int3
ffffffffff60021c: cc int3
ffffffffff60021d: cc int3
ffffffffff60021e: cc int3
ffffffffff60021f: cc int3
ffffffffff600220: cc int3
ffffffffff600221: cc int3
ffffffffff600222: cc int3
ffffffffff600223: cc int3
ffffffffff600224: cc int3
ffffffffff600225: cc int3
ffffffffff600226: cc int3
ffffffffff600227: cc int3
ffffffffff600228: cc int3
ffffffffff600229: cc int3
ffffffffff60022a: cc int3
ffffffffff60022b: cc int3
ffffffffff60022c: cc int3
ffffffffff60022d: cc int3
ffffffffff60022e: cc int3
ffffffffff60022f: cc int3
ffffffffff600230: cc int3
ffffffffff600231: cc int3
ffffffffff600232: cc int3
ffffffffff600233: cc int3
ffffffffff600234: cc int3
ffffffffff600235: cc int3
ffffffffff600236: cc int3
ffffffffff600237: cc int3
ffffffffff600238: cc int3
ffffffffff600239: cc int3
ffffffffff60023a: cc int3
ffffffffff60023b: cc int3
ffffffffff60023c: cc int3
ffffffffff60023d: cc int3
ffffffffff60023e: cc int3
ffffffffff60023f: cc int3
ffffffffff600240: cc int3
ffffffffff600241: cc int3
ffffffffff600242: cc int3
ffffffffff600243: cc int3
ffffffffff600244: cc int3
ffffffffff600245: cc int3
ffffffffff600246: cc int3
ffffffffff600247: cc int3
ffffffffff600248: cc int3
ffffffffff600249: cc int3
ffffffffff60024a: cc int3
ffffffffff60024b: cc int3
ffffffffff60024c: cc int3
ffffffffff60024d: cc int3
ffffffffff60024e: cc int3
ffffffffff60024f: cc int3
ffffffffff600250: cc int3
ffffffffff600251: cc int3
ffffffffff600252: cc int3
ffffffffff600253: cc int3
ffffffffff600254: cc int3
ffffffffff600255: cc int3
ffffffffff600256: cc int3
ffffffffff600257: cc int3
ffffffffff600258: cc int3
ffffffffff600259: cc int3
ffffffffff60025a: cc int3
ffffffffff60025b: cc int3
ffffffffff60025c: cc int3
ffffffffff60025d: cc int3
ffffffffff60025e: cc int3
ffffffffff60025f: cc int3
ffffffffff600260: cc int3
ffffffffff600261: cc int3
ffffffffff600262: cc int3
ffffffffff600263: cc int3
ffffffffff600264: cc int3
ffffffffff600265: cc int3
ffffffffff600266: cc int3
ffffffffff600267: cc int3
ffffffffff600268: cc int3
ffffffffff600269: cc int3
ffffffffff60026a: cc int3
ffffffffff60026b: cc int3
ffffffffff60026c: cc int3
ffffffffff60026d: cc int3
ffffffffff60026e: cc int3
ffffffffff60026f: cc int3
ffffffffff600270: cc int3
ffffffffff600271: cc int3
ffffffffff600272: cc int3
ffffffffff600273: cc int3
ffffffffff600274: cc int3
ffffffffff600275: cc int3
ffffffffff600276: cc int3
ffffffffff600277: cc int3
ffffffffff600278: cc int3
ffffffffff600279: cc int3
ffffffffff60027a: cc int3
ffffffffff60027b: cc int3
ffffffffff60027c: cc int3
ffffffffff60027d: cc int3
ffffffffff60027e: cc int3
ffffffffff60027f: cc int3
ffffffffff600280: cc int3
ffffffffff600281: cc int3
ffffffffff600282: cc int3
ffffffffff600283: cc int3
ffffffffff600284: cc int3
ffffffffff600285: cc int3
ffffffffff600286: cc int3
ffffffffff600287: cc int3
ffffffffff600288: cc int3
ffffffffff600289: cc int3
ffffffffff60028a: cc int3
ffffffffff60028b: cc int3
ffffffffff60028c: cc int3
ffffffffff60028d: cc int3
ffffffffff60028e: cc int3
ffffffffff60028f: cc int3
ffffffffff600290: cc int3
ffffffffff600291: cc int3
ffffffffff600292: cc int3
ffffffffff600293: cc int3
ffffffffff600294: cc int3
ffffffffff600295: cc int3
ffffffffff600296: cc int3
ffffffffff600297: cc int3
ffffffffff600298: cc int3
ffffffffff600299: cc int3
ffffffffff60029a: cc int3
ffffffffff60029b: cc int3
ffffffffff60029c: cc int3
ffffffffff60029d: cc int3
ffffffffff60029e: cc int3
ffffffffff60029f: cc int3
ffffffffff6002a0: cc int3
ffffffffff6002a1: cc int3
ffffffffff6002a2: cc int3
ffffffffff6002a3: cc int3
ffffffffff6002a4: cc int3
ffffffffff6002a5: cc int3
ffffffffff6002a6: cc int3
ffffffffff6002a7: cc int3
ffffffffff6002a8: cc int3
ffffffffff6002a9: cc int3
ffffffffff6002aa: cc int3
ffffffffff6002ab: cc int3
ffffffffff6002ac: cc int3
ffffffffff6002ad: cc int3
ffffffffff6002ae: cc int3
ffffffffff6002af: cc int3
ffffffffff6002b0: cc int3
ffffffffff6002b1: cc int3
ffffffffff6002b2: cc int3
ffffffffff6002b3: cc int3
ffffffffff6002b4: cc int3
ffffffffff6002b5: cc int3
ffffffffff6002b6: cc int3
ffffffffff6002b7: cc int3
ffffffffff6002b8: cc int3
ffffffffff6002b9: cc int3
ffffffffff6002ba: cc int3
ffffffffff6002bb: cc int3
ffffffffff6002bc: cc int3
ffffffffff6002bd: cc int3
ffffffffff6002be: cc int3
ffffffffff6002bf: cc int3
ffffffffff6002c0: cc int3
ffffffffff6002c1: cc int3
ffffffffff6002c2: cc int3
ffffffffff6002c3: cc int3
ffffffffff6002c4: cc int3
ffffffffff6002c5: cc int3
ffffffffff6002c6: cc int3
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ffffffffff6002c8: cc int3
ffffffffff6002c9: cc int3
ffffffffff6002ca: cc int3
ffffffffff6002cb: cc int3
ffffffffff6002cc: cc int3
ffffffffff6002cd: cc int3
ffffffffff6002ce: cc int3
ffffffffff6002cf: cc int3
ffffffffff6002d0: cc int3
ffffffffff6002d1: cc int3
ffffffffff6002d2: cc int3
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ffffffffff6002d4: cc int3
ffffffffff6002d5: cc int3
ffffffffff6002d6: cc int3
ffffffffff6002d7: cc int3
ffffffffff6002d8: cc int3
ffffffffff6002d9: cc int3
ffffffffff6002da: cc int3
ffffffffff6002db: cc int3
ffffffffff6002dc: cc int3
ffffffffff6002dd: cc int3
ffffffffff6002de: cc int3
ffffffffff6002df: cc int3
ffffffffff6002e0: cc int3
ffffffffff6002e1: cc int3
ffffffffff6002e2: cc int3
ffffffffff6002e3: cc int3
ffffffffff6002e4: cc int3
ffffffffff6002e5: cc int3
ffffffffff6002e6: cc int3
ffffffffff6002e7: cc int3
ffffffffff6002e8: cc int3
ffffffffff6002e9: cc int3
ffffffffff6002ea: cc int3
ffffffffff6002eb: cc int3
ffffffffff6002ec: cc int3
ffffffffff6002ed: cc int3
ffffffffff6002ee: cc int3
ffffffffff6002ef: cc int3
ffffffffff6002f0: cc int3
ffffffffff6002f1: cc int3
ffffffffff6002f2: cc int3
ffffffffff6002f3: cc int3
ffffffffff6002f4: cc int3
ffffffffff6002f5: cc int3
ffffffffff6002f6: cc int3
ffffffffff6002f7: cc int3
ffffffffff6002f8: cc int3
ffffffffff6002f9: cc int3
ffffffffff6002fa: cc int3
ffffffffff6002fb: cc int3
ffffffffff6002fc: cc int3
ffffffffff6002fd: cc int3
ffffffffff6002fe: cc int3
ffffffffff6002ff: cc int3
ffffffffff600300: cc int3
ffffffffff600301: cc int3
ffffffffff600302: cc int3
ffffffffff600303: cc int3
ffffffffff600304: cc int3
ffffffffff600305: cc int3
ffffffffff600306: cc int3
ffffffffff600307: cc int3
ffffffffff600308: cc int3
ffffffffff600309: cc int3
ffffffffff60030a: cc int3
ffffffffff60030b: cc int3
ffffffffff60030c: cc int3
ffffffffff60030d: cc int3
ffffffffff60030e: cc int3
ffffffffff60030f: cc int3
ffffffffff600310: cc int3
ffffffffff600311: cc int3
ffffffffff600312: cc int3
ffffffffff600313: cc int3
ffffffffff600314: cc int3
ffffffffff600315: cc int3
ffffffffff600316: cc int3
ffffffffff600317: cc int3
ffffffffff600318: cc int3
ffffffffff600319: cc int3
ffffffffff60031a: cc int3
ffffffffff60031b: cc int3
ffffffffff60031c: cc int3
ffffffffff60031d: cc int3
ffffffffff60031e: cc int3
ffffffffff60031f: cc int3
ffffffffff600320: cc int3
ffffffffff600321: cc int3
ffffffffff600322: cc int3
ffffffffff600323: cc int3
ffffffffff600324: cc int3
ffffffffff600325: cc int3
ffffffffff600326: cc int3
ffffffffff600327: cc int3
ffffffffff600328: cc int3
ffffffffff600329: cc int3
ffffffffff60032a: cc int3
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ffffffffff60032d: cc int3
ffffffffff60032e: cc int3
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ffffffffff600330: cc int3
ffffffffff600331: cc int3
ffffffffff600332: cc int3
ffffffffff600333: cc int3
ffffffffff600334: cc int3
ffffffffff600335: cc int3
ffffffffff600336: cc int3
ffffffffff600337: cc int3
ffffffffff600338: cc int3
ffffffffff600339: cc int3
ffffffffff60033a: cc int3
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ffffffffff60033c: cc int3
ffffffffff60033d: cc int3
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ffffffffff600343: cc int3
ffffffffff600344: cc int3
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ffffffffff600349: cc int3
ffffffffff60034a: cc int3
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ffffffffff60034d: cc int3
ffffffffff60034e: cc int3
ffffffffff60034f: cc int3
ffffffffff600350: cc int3
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ffffffffff600353: cc int3
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ffffffffff600355: cc int3
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ffffffffff600359: cc int3
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ffffffffff600364: cc int3
ffffffffff600365: cc int3
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ffffffffff600390: cc int3
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ffffffffff6003fc: cc int3
ffffffffff6003fd: cc int3
ffffffffff6003fe: cc int3
ffffffffff6003ff: cc int3
ffffffffff600400: 48 c7 c0 c9 00 00 00 mov rax,0xc9
ffffffffff600407: 0f 05 syscall
ffffffffff600409: c3 ret
ffffffffff60040a: cc int3
ffffffffff60040b: cc int3
ffffffffff60040c: cc int3
ffffffffff60040d: cc int3
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ffffffffff600489: cc int3
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ffffffffff6004eb: cc int3
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ffffffffff6004f0: cc int3
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ffffffffff6004f2: cc int3
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ffffffffff6004ff: cc int3
ffffffffff600500: cc int3
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ffffffffff600502: cc int3
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ffffffffff600504: cc int3
ffffffffff600505: cc int3
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ffffffffff600508: cc int3
ffffffffff600509: cc int3
ffffffffff60050a: cc int3
ffffffffff60050b: cc int3
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ffffffffff600515: cc int3
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ffffffffff60051a: cc int3
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ffffffffff60051d: cc int3
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ffffffffff60051f: cc int3
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ffffffffff600537: cc int3
ffffffffff600538: cc int3
ffffffffff600539: cc int3
ffffffffff60053a: cc int3
ffffffffff60053b: cc int3
ffffffffff60053c: cc int3
ffffffffff60053d: cc int3
ffffffffff60053e: cc int3
ffffffffff60053f: cc int3
ffffffffff600540: cc int3
ffffffffff600541: cc int3
ffffffffff600542: cc int3
ffffffffff600543: cc int3
ffffffffff600544: cc int3
ffffffffff600545: cc int3
ffffffffff600546: cc int3
ffffffffff600547: cc int3
ffffffffff600548: cc int3
ffffffffff600549: cc int3
ffffffffff60054a: cc int3
ffffffffff60054b: cc int3
ffffffffff60054c: cc int3
ffffffffff60054d: cc int3
ffffffffff60054e: cc int3
ffffffffff60054f: cc int3
ffffffffff600550: cc int3
ffffffffff600551: cc int3
ffffffffff600552: cc int3
ffffffffff600553: cc int3
ffffffffff600554: cc int3
ffffffffff600555: cc int3
ffffffffff600556: cc int3
ffffffffff600557: cc int3
ffffffffff600558: cc int3
ffffffffff600559: cc int3
ffffffffff60055a: cc int3
ffffffffff60055b: cc int3
ffffffffff60055c: cc int3
ffffffffff60055d: cc int3
ffffffffff60055e: cc int3
ffffffffff60055f: cc int3
ffffffffff600560: cc int3
ffffffffff600561: cc int3
ffffffffff600562: cc int3
ffffffffff600563: cc int3
ffffffffff600564: cc int3
ffffffffff600565: cc int3
ffffffffff600566: cc int3
ffffffffff600567: cc int3
ffffffffff600568: cc int3
ffffffffff600569: cc int3
ffffffffff60056a: cc int3
ffffffffff60056b: cc int3
ffffffffff60056c: cc int3
ffffffffff60056d: cc int3
ffffffffff60056e: cc int3
ffffffffff60056f: cc int3
ffffffffff600570: cc int3
ffffffffff600571: cc int3
ffffffffff600572: cc int3
ffffffffff600573: cc int3
ffffffffff600574: cc int3
ffffffffff600575: cc int3
ffffffffff600576: cc int3
ffffffffff600577: cc int3
ffffffffff600578: cc int3
ffffffffff600579: cc int3
ffffffffff60057a: cc int3
ffffffffff60057b: cc int3
ffffffffff60057c: cc int3
ffffffffff60057d: cc int3
ffffffffff60057e: cc int3
ffffffffff60057f: cc int3
ffffffffff600580: cc int3
ffffffffff600581: cc int3
ffffffffff600582: cc int3
ffffffffff600583: cc int3
ffffffffff600584: cc int3
ffffffffff600585: cc int3
ffffffffff600586: cc int3
ffffffffff600587: cc int3
ffffffffff600588: cc int3
ffffffffff600589: cc int3
ffffffffff60058a: cc int3
ffffffffff60058b: cc int3
ffffffffff60058c: cc int3
ffffffffff60058d: cc int3
ffffffffff60058e: cc int3
ffffffffff60058f: cc int3
ffffffffff600590: cc int3
ffffffffff600591: cc int3
ffffffffff600592: cc int3
ffffffffff600593: cc int3
ffffffffff600594: cc int3
ffffffffff600595: cc int3
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ffffffffff600597: cc int3
ffffffffff600598: cc int3
ffffffffff600599: cc int3
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ffffffffff60059c: cc int3
ffffffffff60059d: cc int3
ffffffffff60059e: cc int3
ffffffffff60059f: cc int3
ffffffffff6005a0: cc int3
ffffffffff6005a1: cc int3
ffffffffff6005a2: cc int3
ffffffffff6005a3: cc int3
ffffffffff6005a4: cc int3
ffffffffff6005a5: cc int3
ffffffffff6005a6: cc int3
ffffffffff6005a7: cc int3
ffffffffff6005a8: cc int3
ffffffffff6005a9: cc int3
ffffffffff6005aa: cc int3
ffffffffff6005ab: cc int3
ffffffffff6005ac: cc int3
ffffffffff6005ad: cc int3
ffffffffff6005ae: cc int3
ffffffffff6005af: cc int3
ffffffffff6005b0: cc int3
ffffffffff6005b1: cc int3
ffffffffff6005b2: cc int3
ffffffffff6005b3: cc int3
ffffffffff6005b4: cc int3
ffffffffff6005b5: cc int3
ffffffffff6005b6: cc int3
ffffffffff6005b7: cc int3
ffffffffff6005b8: cc int3
ffffffffff6005b9: cc int3
ffffffffff6005ba: cc int3
ffffffffff6005bb: cc int3
ffffffffff6005bc: cc int3
ffffffffff6005bd: cc int3
ffffffffff6005be: cc int3
ffffffffff6005bf: cc int3
ffffffffff6005c0: cc int3
ffffffffff6005c1: cc int3
ffffffffff6005c2: cc int3
ffffffffff6005c3: cc int3
ffffffffff6005c4: cc int3
ffffffffff6005c5: cc int3
ffffffffff6005c6: cc int3
ffffffffff6005c7: cc int3
ffffffffff6005c8: cc int3
ffffffffff6005c9: cc int3
ffffffffff6005ca: cc int3
ffffffffff6005cb: cc int3
ffffffffff6005cc: cc int3
ffffffffff6005cd: cc int3
ffffffffff6005ce: cc int3
ffffffffff6005cf: cc int3
ffffffffff6005d0: cc int3
ffffffffff6005d1: cc int3
ffffffffff6005d2: cc int3
ffffffffff6005d3: cc int3
ffffffffff6005d4: cc int3
ffffffffff6005d5: cc int3
ffffffffff6005d6: cc int3
ffffffffff6005d7: cc int3
ffffffffff6005d8: cc int3
ffffffffff6005d9: cc int3
ffffffffff6005da: cc int3
ffffffffff6005db: cc int3
ffffffffff6005dc: cc int3
ffffffffff6005dd: cc int3
ffffffffff6005de: cc int3
ffffffffff6005df: cc int3
ffffffffff6005e0: cc int3
ffffffffff6005e1: cc int3
ffffffffff6005e2: cc int3
ffffffffff6005e3: cc int3
ffffffffff6005e4: cc int3
ffffffffff6005e5: cc int3
ffffffffff6005e6: cc int3
ffffffffff6005e7: cc int3
ffffffffff6005e8: cc int3
ffffffffff6005e9: cc int3
ffffffffff6005ea: cc int3
ffffffffff6005eb: cc int3
ffffffffff6005ec: cc int3
ffffffffff6005ed: cc int3
ffffffffff6005ee: cc int3
ffffffffff6005ef: cc int3
ffffffffff6005f0: cc int3
ffffffffff6005f1: cc int3
ffffffffff6005f2: cc int3
ffffffffff6005f3: cc int3
ffffffffff6005f4: cc int3
ffffffffff6005f5: cc int3
ffffffffff6005f6: cc int3
ffffffffff6005f7: cc int3
ffffffffff6005f8: cc int3
ffffffffff6005f9: cc int3
ffffffffff6005fa: cc int3
ffffffffff6005fb: cc int3
ffffffffff6005fc: cc int3
ffffffffff6005fd: cc int3
ffffffffff6005fe: cc int3
ffffffffff6005ff: cc int3
ffffffffff600600: cc int3
ffffffffff600601: cc int3
ffffffffff600602: cc int3
ffffffffff600603: cc int3
ffffffffff600604: cc int3
ffffffffff600605: cc int3
ffffffffff600606: cc int3
ffffffffff600607: cc int3
ffffffffff600608: cc int3
ffffffffff600609: cc int3
ffffffffff60060a: cc int3
ffffffffff60060b: cc int3
ffffffffff60060c: cc int3
ffffffffff60060d: cc int3
ffffffffff60060e: cc int3
ffffffffff60060f: cc int3
ffffffffff600610: cc int3
ffffffffff600611: cc int3
ffffffffff600612: cc int3
ffffffffff600613: cc int3
ffffffffff600614: cc int3
ffffffffff600615: cc int3
ffffffffff600616: cc int3
ffffffffff600617: cc int3
ffffffffff600618: cc int3
ffffffffff600619: cc int3
ffffffffff60061a: cc int3
ffffffffff60061b: cc int3
ffffffffff60061c: cc int3
ffffffffff60061d: cc int3
ffffffffff60061e: cc int3
ffffffffff60061f: cc int3
ffffffffff600620: cc int3
ffffffffff600621: cc int3
ffffffffff600622: cc int3
ffffffffff600623: cc int3
ffffffffff600624: cc int3
ffffffffff600625: cc int3
ffffffffff600626: cc int3
ffffffffff600627: cc int3
ffffffffff600628: cc int3
ffffffffff600629: cc int3
ffffffffff60062a: cc int3
ffffffffff60062b: cc int3
ffffffffff60062c: cc int3
ffffffffff60062d: cc int3
ffffffffff60062e: cc int3
ffffffffff60062f: cc int3
ffffffffff600630: cc int3
ffffffffff600631: cc int3
ffffffffff600632: cc int3
ffffffffff600633: cc int3
ffffffffff600634: cc int3
ffffffffff600635: cc int3
ffffffffff600636: cc int3
ffffffffff600637: cc int3
ffffffffff600638: cc int3
ffffffffff600639: cc int3
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ffffffffff60063c: cc int3
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ffffffffff60063e: cc int3
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ffffffffff600640: cc int3
ffffffffff600641: cc int3
ffffffffff600642: cc int3
ffffffffff600643: cc int3
ffffffffff600644: cc int3
ffffffffff600645: cc int3
ffffffffff600646: cc int3
ffffffffff600647: cc int3
ffffffffff600648: cc int3
ffffffffff600649: cc int3
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ffffffffff600651: cc int3
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ffffffffff600653: cc int3
ffffffffff600654: cc int3
ffffffffff600655: cc int3
ffffffffff600656: cc int3
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ffffffffff600659: cc int3
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ffffffffff600662: cc int3
ffffffffff600663: cc int3
ffffffffff600664: cc int3
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ffffffffff600666: cc int3
ffffffffff600667: cc int3
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ffffffffff600671: cc int3
ffffffffff600672: cc int3
ffffffffff600673: cc int3
ffffffffff600674: cc int3
ffffffffff600675: cc int3
ffffffffff600676: cc int3
ffffffffff600677: cc int3
ffffffffff600678: cc int3
ffffffffff600679: cc int3
ffffffffff60067a: cc int3
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ffffffffff60067c: cc int3
ffffffffff60067d: cc int3
ffffffffff60067e: cc int3
ffffffffff60067f: cc int3
ffffffffff600680: cc int3
ffffffffff600681: cc int3
ffffffffff600682: cc int3
ffffffffff600683: cc int3
ffffffffff600684: cc int3
ffffffffff600685: cc int3
ffffffffff600686: cc int3
ffffffffff600687: cc int3
ffffffffff600688: cc int3
ffffffffff600689: cc int3
ffffffffff60068a: cc int3
ffffffffff60068b: cc int3
ffffffffff60068c: cc int3
ffffffffff60068d: cc int3
ffffffffff60068e: cc int3
ffffffffff60068f: cc int3
ffffffffff600690: cc int3
ffffffffff600691: cc int3
ffffffffff600692: cc int3
ffffffffff600693: cc int3
ffffffffff600694: cc int3
ffffffffff600695: cc int3
ffffffffff600696: cc int3
ffffffffff600697: cc int3
ffffffffff600698: cc int3
ffffffffff600699: cc int3
ffffffffff60069a: cc int3
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ffffffffff60069c: cc int3
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ffffffffff6006a3: cc int3
ffffffffff6006a4: cc int3
ffffffffff6006a5: cc int3
ffffffffff6006a6: cc int3
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ffffffffff6006aa: cc int3
ffffffffff6006ab: cc int3
ffffffffff6006ac: cc int3
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ffffffffff6006b0: cc int3
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ffffffffff6006bb: cc int3
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ffffffffff6006c0: cc int3
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ffffffffff6006c2: cc int3
ffffffffff6006c3: cc int3
ffffffffff6006c4: cc int3
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ffffffffff6006d8: cc int3
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ffffffffff6006db: cc int3
ffffffffff6006dc: cc int3
ffffffffff6006dd: cc int3
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ffffffffff6006e0: cc int3
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ffffffffff6006e2: cc int3
ffffffffff6006e3: cc int3
ffffffffff6006e4: cc int3
ffffffffff6006e5: cc int3
ffffffffff6006e6: cc int3
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ffffffffff6006e9: cc int3
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ffffffffff6006eb: cc int3
ffffffffff6006ec: cc int3
ffffffffff6006ed: cc int3
ffffffffff6006ee: cc int3
ffffffffff6006ef: cc int3
ffffffffff6006f0: cc int3
ffffffffff6006f1: cc int3
ffffffffff6006f2: cc int3
ffffffffff6006f3: cc int3
ffffffffff6006f4: cc int3
ffffffffff6006f5: cc int3
ffffffffff6006f6: cc int3
ffffffffff6006f7: cc int3
ffffffffff6006f8: cc int3
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ffffffffff6006fa: cc int3
ffffffffff6006fb: cc int3
ffffffffff6006fc: cc int3
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ffffffffff600700: cc int3
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ffffffffff600702: cc int3
ffffffffff600703: cc int3
ffffffffff600704: cc int3
ffffffffff600705: cc int3
ffffffffff600706: cc int3
ffffffffff600707: cc int3
ffffffffff600708: cc int3
ffffffffff600709: cc int3
ffffffffff60070a: cc int3
ffffffffff60070b: cc int3
ffffffffff60070c: cc int3
ffffffffff60070d: cc int3
ffffffffff60070e: cc int3
ffffffffff60070f: cc int3
ffffffffff600710: cc int3
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ffffffffff600714: cc int3
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ffffffffff600717: cc int3
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ffffffffff600719: cc int3
ffffffffff60071a: cc int3
ffffffffff60071b: cc int3
ffffffffff60071c: cc int3
ffffffffff60071d: cc int3
ffffffffff60071e: cc int3
ffffffffff60071f: cc int3
ffffffffff600720: cc int3
ffffffffff600721: cc int3
ffffffffff600722: cc int3
ffffffffff600723: cc int3
ffffffffff600724: cc int3
ffffffffff600725: cc int3
ffffffffff600726: cc int3
ffffffffff600727: cc int3
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ffffffffff600730: cc int3
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ffffffffff600735: cc int3
ffffffffff600736: cc int3
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ffffffffff60073a: cc int3
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ffffffffff60073c: cc int3
ffffffffff60073d: cc int3
ffffffffff60073e: cc int3
ffffffffff60073f: cc int3
ffffffffff600740: cc int3
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ffffffffff600744: cc int3
ffffffffff600745: cc int3
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ffffffffff600747: cc int3
ffffffffff600748: cc int3
ffffffffff600749: cc int3
ffffffffff60074a: cc int3
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ffffffffff60074c: cc int3
ffffffffff60074d: cc int3
ffffffffff60074e: cc int3
ffffffffff60074f: cc int3
ffffffffff600750: cc int3
ffffffffff600751: cc int3
ffffffffff600752: cc int3
ffffffffff600753: cc int3
ffffffffff600754: cc int3
ffffffffff600755: cc int3
ffffffffff600756: cc int3
ffffffffff600757: cc int3
ffffffffff600758: cc int3
ffffffffff600759: cc int3
ffffffffff60075a: cc int3
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ffffffffff60075f: cc int3
ffffffffff600760: cc int3
ffffffffff600761: cc int3
ffffffffff600762: cc int3
ffffffffff600763: cc int3
ffffffffff600764: cc int3
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ffffffffff600766: cc int3
ffffffffff600767: cc int3
ffffffffff600768: cc int3
ffffffffff600769: cc int3
ffffffffff60076a: cc int3
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ffffffffff60076c: cc int3
ffffffffff60076d: cc int3
ffffffffff60076e: cc int3
ffffffffff60076f: cc int3
ffffffffff600770: cc int3
ffffffffff600771: cc int3
ffffffffff600772: cc int3
ffffffffff600773: cc int3
ffffffffff600774: cc int3
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ffffffffff600777: cc int3
ffffffffff600778: cc int3
ffffffffff600779: cc int3
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ffffffffff60077e: cc int3
ffffffffff60077f: cc int3
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ffffffffff600781: cc int3
ffffffffff600782: cc int3
ffffffffff600783: cc int3
ffffffffff600784: cc int3
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ffffffffff600786: cc int3
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ffffffffff6007af: cc int3
ffffffffff6007b0: cc int3
ffffffffff6007b1: cc int3
ffffffffff6007b2: cc int3
ffffffffff6007b3: cc int3
ffffffffff6007b4: cc int3
ffffffffff6007b5: cc int3
ffffffffff6007b6: cc int3
ffffffffff6007b7: cc int3
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ffffffffff6007b9: cc int3
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ffffffffff6007bb: cc int3
ffffffffff6007bc: cc int3
ffffffffff6007bd: cc int3
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ffffffffff6007c0: cc int3
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ffffffffff6007c2: cc int3
ffffffffff6007c3: cc int3
ffffffffff6007c4: cc int3
ffffffffff6007c5: cc int3
ffffffffff6007c6: cc int3
ffffffffff6007c7: cc int3
ffffffffff6007c8: cc int3
ffffffffff6007c9: cc int3
ffffffffff6007ca: cc int3
ffffffffff6007cb: cc int3
ffffffffff6007cc: cc int3
ffffffffff6007cd: cc int3
ffffffffff6007ce: cc int3
ffffffffff6007cf: cc int3
ffffffffff6007d0: cc int3
ffffffffff6007d1: cc int3
ffffffffff6007d2: cc int3
ffffffffff6007d3: cc int3
ffffffffff6007d4: cc int3
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ffffffffff6007d7: cc int3
ffffffffff6007d8: cc int3
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ffffffffff6007da: cc int3
ffffffffff6007db: cc int3
ffffffffff6007dc: cc int3
ffffffffff6007dd: cc int3
ffffffffff6007de: cc int3
ffffffffff6007df: cc int3
ffffffffff6007e0: cc int3
ffffffffff6007e1: cc int3
ffffffffff6007e2: cc int3
ffffffffff6007e3: cc int3
ffffffffff6007e4: cc int3
ffffffffff6007e5: cc int3
ffffffffff6007e6: cc int3
ffffffffff6007e7: cc int3
ffffffffff6007e8: cc int3
ffffffffff6007e9: cc int3
ffffffffff6007ea: cc int3
ffffffffff6007eb: cc int3
ffffffffff6007ec: cc int3
ffffffffff6007ed: cc int3
ffffffffff6007ee: cc int3
ffffffffff6007ef: cc int3
ffffffffff6007f0: cc int3
ffffffffff6007f1: cc int3
ffffffffff6007f2: cc int3
ffffffffff6007f3: cc int3
ffffffffff6007f4: cc int3
ffffffffff6007f5: cc int3
ffffffffff6007f6: cc int3
ffffffffff6007f7: cc int3
ffffffffff6007f8: cc int3
ffffffffff6007f9: cc int3
ffffffffff6007fa: cc int3
ffffffffff6007fb: cc int3
ffffffffff6007fc: cc int3
ffffffffff6007fd: cc int3
ffffffffff6007fe: cc int3
ffffffffff6007ff: cc int3
ffffffffff600800: 48 c7 c0 35 01 00 00 mov rax,0x135
ffffffffff600807: 0f 05 syscall
ffffffffff600809: c3 ret
ffffffffff60080a: cc int3
ffffffffff60080b: cc int3
ffffffffff60080c: cc int3
ffffffffff60080d: cc int3
ffffffffff60080e: cc int3
ffffffffff60080f: cc int3
ffffffffff600810: cc int3
ffffffffff600811: cc int3
ffffffffff600812: cc int3
ffffffffff600813: cc int3
ffffffffff600814: cc int3
ffffffffff600815: cc int3
ffffffffff600816: cc int3
ffffffffff600817: cc int3
ffffffffff600818: cc int3
ffffffffff600819: cc int3
ffffffffff60081a: cc int3
ffffffffff60081b: cc int3
ffffffffff60081c: cc int3
ffffffffff60081d: cc int3
ffffffffff60081e: cc int3
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ffffffffff600afa: cc int3
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ffffffffff600afe: cc int3
ffffffffff600aff: cc int3
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ffffffffff600dd1: cc int3
ffffffffff600dd2: cc int3
ffffffffff600dd3: cc int3
ffffffffff600dd4: cc int3
ffffffffff600dd5: cc int3
ffffffffff600dd6: cc int3
ffffffffff600dd7: cc int3
ffffffffff600dd8: cc int3
ffffffffff600dd9: cc int3
ffffffffff600dda: cc int3
ffffffffff600ddb: cc int3
ffffffffff600ddc: cc int3
ffffffffff600ddd: cc int3
ffffffffff600dde: cc int3
ffffffffff600ddf: cc int3
ffffffffff600de0: cc int3
ffffffffff600de1: cc int3
ffffffffff600de2: cc int3
ffffffffff600de3: cc int3
ffffffffff600de4: cc int3
ffffffffff600de5: cc int3
ffffffffff600de6: cc int3
ffffffffff600de7: cc int3
ffffffffff600de8: cc int3
ffffffffff600de9: cc int3
ffffffffff600dea: cc int3
ffffffffff600deb: cc int3
ffffffffff600dec: cc int3
ffffffffff600ded: cc int3
ffffffffff600dee: cc int3
ffffffffff600def: cc int3
ffffffffff600df0: cc int3
ffffffffff600df1: cc int3
ffffffffff600df2: cc int3
ffffffffff600df3: cc int3
ffffffffff600df4: cc int3
ffffffffff600df5: cc int3
ffffffffff600df6: cc int3
ffffffffff600df7: cc int3
ffffffffff600df8: cc int3
ffffffffff600df9: cc int3
ffffffffff600dfa: cc int3
ffffffffff600dfb: cc int3
ffffffffff600dfc: cc int3
ffffffffff600dfd: cc int3
ffffffffff600dfe: cc int3
ffffffffff600dff: cc int3
ffffffffff600e00: cc int3
ffffffffff600e01: cc int3
ffffffffff600e02: cc int3
ffffffffff600e03: cc int3
ffffffffff600e04: cc int3
ffffffffff600e05: cc int3
ffffffffff600e06: cc int3
ffffffffff600e07: cc int3
ffffffffff600e08: cc int3
ffffffffff600e09: cc int3
ffffffffff600e0a: cc int3
ffffffffff600e0b: cc int3
ffffffffff600e0c: cc int3
ffffffffff600e0d: cc int3
ffffffffff600e0e: cc int3
ffffffffff600e0f: cc int3
ffffffffff600e10: cc int3
ffffffffff600e11: cc int3
ffffffffff600e12: cc int3
ffffffffff600e13: cc int3
ffffffffff600e14: cc int3
ffffffffff600e15: cc int3
ffffffffff600e16: cc int3
ffffffffff600e17: cc int3
ffffffffff600e18: cc int3
ffffffffff600e19: cc int3
ffffffffff600e1a: cc int3
ffffffffff600e1b: cc int3
ffffffffff600e1c: cc int3
ffffffffff600e1d: cc int3
ffffffffff600e1e: cc int3
ffffffffff600e1f: cc int3
ffffffffff600e20: cc int3
ffffffffff600e21: cc int3
ffffffffff600e22: cc int3
ffffffffff600e23: cc int3
ffffffffff600e24: cc int3
ffffffffff600e25: cc int3
ffffffffff600e26: cc int3
ffffffffff600e27: cc int3
ffffffffff600e28: cc int3
ffffffffff600e29: cc int3
ffffffffff600e2a: cc int3
ffffffffff600e2b: cc int3
ffffffffff600e2c: cc int3
ffffffffff600e2d: cc int3
ffffffffff600e2e: cc int3
ffffffffff600e2f: cc int3
ffffffffff600e30: cc int3
ffffffffff600e31: cc int3
ffffffffff600e32: cc int3
ffffffffff600e33: cc int3
ffffffffff600e34: cc int3
ffffffffff600e35: cc int3
ffffffffff600e36: cc int3
ffffffffff600e37: cc int3
ffffffffff600e38: cc int3
ffffffffff600e39: cc int3
ffffffffff600e3a: cc int3
ffffffffff600e3b: cc int3
ffffffffff600e3c: cc int3
ffffffffff600e3d: cc int3
ffffffffff600e3e: cc int3
ffffffffff600e3f: cc int3
ffffffffff600e40: cc int3
ffffffffff600e41: cc int3
ffffffffff600e42: cc int3
ffffffffff600e43: cc int3
ffffffffff600e44: cc int3
ffffffffff600e45: cc int3
ffffffffff600e46: cc int3
ffffffffff600e47: cc int3
ffffffffff600e48: cc int3
ffffffffff600e49: cc int3
ffffffffff600e4a: cc int3
ffffffffff600e4b: cc int3
ffffffffff600e4c: cc int3
ffffffffff600e4d: cc int3
ffffffffff600e4e: cc int3
ffffffffff600e4f: cc int3
ffffffffff600e50: cc int3
ffffffffff600e51: cc int3
ffffffffff600e52: cc int3
ffffffffff600e53: cc int3
ffffffffff600e54: cc int3
ffffffffff600e55: cc int3
ffffffffff600e56: cc int3
ffffffffff600e57: cc int3
ffffffffff600e58: cc int3
ffffffffff600e59: cc int3
ffffffffff600e5a: cc int3
ffffffffff600e5b: cc int3
ffffffffff600e5c: cc int3
ffffffffff600e5d: cc int3
ffffffffff600e5e: cc int3
ffffffffff600e5f: cc int3
ffffffffff600e60: cc int3
ffffffffff600e61: cc int3
ffffffffff600e62: cc int3
ffffffffff600e63: cc int3
ffffffffff600e64: cc int3
ffffffffff600e65: cc int3
ffffffffff600e66: cc int3
ffffffffff600e67: cc int3
ffffffffff600e68: cc int3
ffffffffff600e69: cc int3
ffffffffff600e6a: cc int3
ffffffffff600e6b: cc int3
ffffffffff600e6c: cc int3
ffffffffff600e6d: cc int3
ffffffffff600e6e: cc int3
ffffffffff600e6f: cc int3
ffffffffff600e70: cc int3
ffffffffff600e71: cc int3
ffffffffff600e72: cc int3
ffffffffff600e73: cc int3
ffffffffff600e74: cc int3
ffffffffff600e75: cc int3
ffffffffff600e76: cc int3
ffffffffff600e77: cc int3
ffffffffff600e78: cc int3
ffffffffff600e79: cc int3
ffffffffff600e7a: cc int3
ffffffffff600e7b: cc int3
ffffffffff600e7c: cc int3
ffffffffff600e7d: cc int3
ffffffffff600e7e: cc int3
ffffffffff600e7f: cc int3
ffffffffff600e80: cc int3
ffffffffff600e81: cc int3
ffffffffff600e82: cc int3
ffffffffff600e83: cc int3
ffffffffff600e84: cc int3
ffffffffff600e85: cc int3
ffffffffff600e86: cc int3
ffffffffff600e87: cc int3
ffffffffff600e88: cc int3
ffffffffff600e89: cc int3
ffffffffff600e8a: cc int3
ffffffffff600e8b: cc int3
ffffffffff600e8c: cc int3
ffffffffff600e8d: cc int3
ffffffffff600e8e: cc int3
ffffffffff600e8f: cc int3
ffffffffff600e90: cc int3
ffffffffff600e91: cc int3
ffffffffff600e92: cc int3
ffffffffff600e93: cc int3
ffffffffff600e94: cc int3
ffffffffff600e95: cc int3
ffffffffff600e96: cc int3
ffffffffff600e97: cc int3
ffffffffff600e98: cc int3
ffffffffff600e99: cc int3
ffffffffff600e9a: cc int3
ffffffffff600e9b: cc int3
ffffffffff600e9c: cc int3
ffffffffff600e9d: cc int3
ffffffffff600e9e: cc int3
ffffffffff600e9f: cc int3
ffffffffff600ea0: cc int3
ffffffffff600ea1: cc int3
ffffffffff600ea2: cc int3
ffffffffff600ea3: cc int3
ffffffffff600ea4: cc int3
ffffffffff600ea5: cc int3
ffffffffff600ea6: cc int3
ffffffffff600ea7: cc int3
ffffffffff600ea8: cc int3
ffffffffff600ea9: cc int3
ffffffffff600eaa: cc int3
ffffffffff600eab: cc int3
ffffffffff600eac: cc int3
ffffffffff600ead: cc int3
ffffffffff600eae: cc int3
ffffffffff600eaf: cc int3
ffffffffff600eb0: cc int3
ffffffffff600eb1: cc int3
ffffffffff600eb2: cc int3
ffffffffff600eb3: cc int3
ffffffffff600eb4: cc int3
ffffffffff600eb5: cc int3
ffffffffff600eb6: cc int3
ffffffffff600eb7: cc int3
ffffffffff600eb8: cc int3
ffffffffff600eb9: cc int3
ffffffffff600eba: cc int3
ffffffffff600ebb: cc int3
ffffffffff600ebc: cc int3
ffffffffff600ebd: cc int3
ffffffffff600ebe: cc int3
ffffffffff600ebf: cc int3
ffffffffff600ec0: cc int3
ffffffffff600ec1: cc int3
ffffffffff600ec2: cc int3
ffffffffff600ec3: cc int3
ffffffffff600ec4: cc int3
ffffffffff600ec5: cc int3
ffffffffff600ec6: cc int3
ffffffffff600ec7: cc int3
ffffffffff600ec8: cc int3
ffffffffff600ec9: cc int3
ffffffffff600eca: cc int3
ffffffffff600ecb: cc int3
ffffffffff600ecc: cc int3
ffffffffff600ecd: cc int3
ffffffffff600ece: cc int3
ffffffffff600ecf: cc int3
ffffffffff600ed0: cc int3
ffffffffff600ed1: cc int3
ffffffffff600ed2: cc int3
ffffffffff600ed3: cc int3
ffffffffff600ed4: cc int3
ffffffffff600ed5: cc int3
ffffffffff600ed6: cc int3
ffffffffff600ed7: cc int3
ffffffffff600ed8: cc int3
ffffffffff600ed9: cc int3
ffffffffff600eda: cc int3
ffffffffff600edb: cc int3
ffffffffff600edc: cc int3
ffffffffff600edd: cc int3
ffffffffff600ede: cc int3
ffffffffff600edf: cc int3
ffffffffff600ee0: cc int3
ffffffffff600ee1: cc int3
ffffffffff600ee2: cc int3
ffffffffff600ee3: cc int3
ffffffffff600ee4: cc int3
ffffffffff600ee5: cc int3
ffffffffff600ee6: cc int3
ffffffffff600ee7: cc int3
ffffffffff600ee8: cc int3
ffffffffff600ee9: cc int3
ffffffffff600eea: cc int3
ffffffffff600eeb: cc int3
ffffffffff600eec: cc int3
ffffffffff600eed: cc int3
ffffffffff600eee: cc int3
ffffffffff600eef: cc int3
ffffffffff600ef0: cc int3
ffffffffff600ef1: cc int3
ffffffffff600ef2: cc int3
ffffffffff600ef3: cc int3
ffffffffff600ef4: cc int3
ffffffffff600ef5: cc int3
ffffffffff600ef6: cc int3
ffffffffff600ef7: cc int3
ffffffffff600ef8: cc int3
ffffffffff600ef9: cc int3
ffffffffff600efa: cc int3
ffffffffff600efb: cc int3
ffffffffff600efc: cc int3
ffffffffff600efd: cc int3
ffffffffff600efe: cc int3
ffffffffff600eff: cc int3
ffffffffff600f00: cc int3
ffffffffff600f01: cc int3
ffffffffff600f02: cc int3
ffffffffff600f03: cc int3
ffffffffff600f04: cc int3
ffffffffff600f05: cc int3
ffffffffff600f06: cc int3
ffffffffff600f07: cc int3
ffffffffff600f08: cc int3
ffffffffff600f09: cc int3
ffffffffff600f0a: cc int3
ffffffffff600f0b: cc int3
ffffffffff600f0c: cc int3
ffffffffff600f0d: cc int3
ffffffffff600f0e: cc int3
ffffffffff600f0f: cc int3
ffffffffff600f10: cc int3
ffffffffff600f11: cc int3
ffffffffff600f12: cc int3
ffffffffff600f13: cc int3
ffffffffff600f14: cc int3
ffffffffff600f15: cc int3
ffffffffff600f16: cc int3
ffffffffff600f17: cc int3
ffffffffff600f18: cc int3
ffffffffff600f19: cc int3
ffffffffff600f1a: cc int3
ffffffffff600f1b: cc int3
ffffffffff600f1c: cc int3
ffffffffff600f1d: cc int3
ffffffffff600f1e: cc int3
ffffffffff600f1f: cc int3
ffffffffff600f20: cc int3
ffffffffff600f21: cc int3
ffffffffff600f22: cc int3
ffffffffff600f23: cc int3
ffffffffff600f24: cc int3
ffffffffff600f25: cc int3
ffffffffff600f26: cc int3
ffffffffff600f27: cc int3
ffffffffff600f28: cc int3
ffffffffff600f29: cc int3
ffffffffff600f2a: cc int3
ffffffffff600f2b: cc int3
ffffffffff600f2c: cc int3
ffffffffff600f2d: cc int3
ffffffffff600f2e: cc int3
ffffffffff600f2f: cc int3
ffffffffff600f30: cc int3
ffffffffff600f31: cc int3
ffffffffff600f32: cc int3
ffffffffff600f33: cc int3
ffffffffff600f34: cc int3
ffffffffff600f35: cc int3
ffffffffff600f36: cc int3
ffffffffff600f37: cc int3
ffffffffff600f38: cc int3
ffffffffff600f39: cc int3
ffffffffff600f3a: cc int3
ffffffffff600f3b: cc int3
ffffffffff600f3c: cc int3
ffffffffff600f3d: cc int3
ffffffffff600f3e: cc int3
ffffffffff600f3f: cc int3
ffffffffff600f40: cc int3
ffffffffff600f41: cc int3
ffffffffff600f42: cc int3
ffffffffff600f43: cc int3
ffffffffff600f44: cc int3
ffffffffff600f45: cc int3
ffffffffff600f46: cc int3
ffffffffff600f47: cc int3
ffffffffff600f48: cc int3
ffffffffff600f49: cc int3
ffffffffff600f4a: cc int3
ffffffffff600f4b: cc int3
ffffffffff600f4c: cc int3
ffffffffff600f4d: cc int3
ffffffffff600f4e: cc int3
ffffffffff600f4f: cc int3
ffffffffff600f50: cc int3
ffffffffff600f51: cc int3
ffffffffff600f52: cc int3
ffffffffff600f53: cc int3
ffffffffff600f54: cc int3
ffffffffff600f55: cc int3
ffffffffff600f56: cc int3
ffffffffff600f57: cc int3
ffffffffff600f58: cc int3
ffffffffff600f59: cc int3
ffffffffff600f5a: cc int3
ffffffffff600f5b: cc int3
ffffffffff600f5c: cc int3
ffffffffff600f5d: cc int3
ffffffffff600f5e: cc int3
ffffffffff600f5f: cc int3
ffffffffff600f60: cc int3
ffffffffff600f61: cc int3
ffffffffff600f62: cc int3
ffffffffff600f63: cc int3
ffffffffff600f64: cc int3
ffffffffff600f65: cc int3
ffffffffff600f66: cc int3
ffffffffff600f67: cc int3
ffffffffff600f68: cc int3
ffffffffff600f69: cc int3
ffffffffff600f6a: cc int3
ffffffffff600f6b: cc int3
ffffffffff600f6c: cc int3
ffffffffff600f6d: cc int3
ffffffffff600f6e: cc int3
ffffffffff600f6f: cc int3
ffffffffff600f70: cc int3
ffffffffff600f71: cc int3
ffffffffff600f72: cc int3
ffffffffff600f73: cc int3
ffffffffff600f74: cc int3
ffffffffff600f75: cc int3
ffffffffff600f76: cc int3
ffffffffff600f77: cc int3
ffffffffff600f78: cc int3
ffffffffff600f79: cc int3
ffffffffff600f7a: cc int3
ffffffffff600f7b: cc int3
ffffffffff600f7c: cc int3
ffffffffff600f7d: cc int3
ffffffffff600f7e: cc int3
ffffffffff600f7f: cc int3
ffffffffff600f80: cc int3
ffffffffff600f81: cc int3
ffffffffff600f82: cc int3
ffffffffff600f83: cc int3
ffffffffff600f84: cc int3
ffffffffff600f85: cc int3
ffffffffff600f86: cc int3
ffffffffff600f87: cc int3
ffffffffff600f88: cc int3
ffffffffff600f89: cc int3
ffffffffff600f8a: cc int3
ffffffffff600f8b: cc int3
ffffffffff600f8c: cc int3
ffffffffff600f8d: cc int3
ffffffffff600f8e: cc int3
ffffffffff600f8f: cc int3
ffffffffff600f90: cc int3
ffffffffff600f91: cc int3
ffffffffff600f92: cc int3
ffffffffff600f93: cc int3
ffffffffff600f94: cc int3
ffffffffff600f95: cc int3
ffffffffff600f96: cc int3
ffffffffff600f97: cc int3
ffffffffff600f98: cc int3
ffffffffff600f99: cc int3
ffffffffff600f9a: cc int3
ffffffffff600f9b: cc int3
ffffffffff600f9c: cc int3
ffffffffff600f9d: cc int3
ffffffffff600f9e: cc int3
ffffffffff600f9f: cc int3
ffffffffff600fa0: cc int3
ffffffffff600fa1: cc int3
ffffffffff600fa2: cc int3
ffffffffff600fa3: cc int3
ffffffffff600fa4: cc int3
ffffffffff600fa5: cc int3
ffffffffff600fa6: cc int3
ffffffffff600fa7: cc int3
ffffffffff600fa8: cc int3
ffffffffff600fa9: cc int3
ffffffffff600faa: cc int3
ffffffffff600fab: cc int3
ffffffffff600fac: cc int3
ffffffffff600fad: cc int3
ffffffffff600fae: cc int3
ffffffffff600faf: cc int3
ffffffffff600fb0: cc int3
ffffffffff600fb1: cc int3
ffffffffff600fb2: cc int3
ffffffffff600fb3: cc int3
ffffffffff600fb4: cc int3
ffffffffff600fb5: cc int3
ffffffffff600fb6: cc int3
ffffffffff600fb7: cc int3
ffffffffff600fb8: cc int3
ffffffffff600fb9: cc int3
ffffffffff600fba: cc int3
ffffffffff600fbb: cc int3
ffffffffff600fbc: cc int3
ffffffffff600fbd: cc int3
ffffffffff600fbe: cc int3
ffffffffff600fbf: cc int3
ffffffffff600fc0: cc int3
ffffffffff600fc1: cc int3
ffffffffff600fc2: cc int3
ffffffffff600fc3: cc int3
ffffffffff600fc4: cc int3
ffffffffff600fc5: cc int3
ffffffffff600fc6: cc int3
ffffffffff600fc7: cc int3
ffffffffff600fc8: cc int3
ffffffffff600fc9: cc int3
ffffffffff600fca: cc int3
ffffffffff600fcb: cc int3
ffffffffff600fcc: cc int3
ffffffffff600fcd: cc int3
ffffffffff600fce: cc int3
ffffffffff600fcf: cc int3
ffffffffff600fd0: cc int3
ffffffffff600fd1: cc int3
ffffffffff600fd2: cc int3
ffffffffff600fd3: cc int3
ffffffffff600fd4: cc int3
ffffffffff600fd5: cc int3
ffffffffff600fd6: cc int3
ffffffffff600fd7: cc int3
ffffffffff600fd8: cc int3
ffffffffff600fd9: cc int3
ffffffffff600fda: cc int3
ffffffffff600fdb: cc int3
ffffffffff600fdc: cc int3
ffffffffff600fdd: cc int3
ffffffffff600fde: cc int3
ffffffffff600fdf: cc int3
ffffffffff600fe0: cc int3
ffffffffff600fe1: cc int3
ffffffffff600fe2: cc int3
ffffffffff600fe3: cc int3
ffffffffff600fe4: cc int3
ffffffffff600fe5: cc int3
ffffffffff600fe6: cc int3
ffffffffff600fe7: cc int3
ffffffffff600fe8: cc int3
ffffffffff600fe9: cc int3
ffffffffff600fea: cc int3
ffffffffff600feb: cc int3
ffffffffff600fec: cc int3
ffffffffff600fed: cc int3
ffffffffff600fee: cc int3
ffffffffff600fef: cc int3
ffffffffff600ff0: cc int3
ffffffffff600ff1: cc int3
ffffffffff600ff2: cc int3
ffffffffff600ff3: cc int3
ffffffffff600ff4: cc int3
ffffffffff600ff5: cc int3
ffffffffff600ff6: cc int3
ffffffffff600ff7: cc int3
ffffffffff600ff8: cc int3
ffffffffff600ff9: cc int3
ffffffffff600ffa: cc int3
ffffffffff600ffb: cc int3
ffffffffff600ffc: cc int3
ffffffffff600ffd: cc int3
ffffffffff600ffe: cc int3
ffffffffff600fff: cc int3 可以很明显的看到，所谓的快速系统调用，无非是透过了运行库LIBC，用了快速系统调用的指令syscall而已，而系统调用所需要的最本质的东西，比如需要设置系统调用号，触发系统调用陷入以及CPU模式切换，一个都没有少。
性能测试
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <sys/syscall.h>
int main(int argc, char **argv)
{
unsigned long i = 0;
time_t (*f)(time_t *) = (time_t (*)(time_t *))0xffffffffff600400UL;
if (!strcmp(argv[1], "vsyscall")) {
for (i = 0; i < 1000000; ++i)
f(NULL);
} else if (!strcmp(argv[1], "vdso")) {
for (i = 0; i < 1000000;++i)
time(NULL);
} else {
for (i = 0; i < 1000000; ++i)
syscall(SYS_time, NULL);
}
return 0;
}
可以看到，论性能，vsyscall-native==vsyscall < vdso. 这是因为vsyscall和vsyscall-native=本质上都要进行系统调用。而VDSO不同，VDSO的原理下文介绍。
vDSO
vDSO全称是virtual Dynamic Shared Object, 这是一个虚拟动态链接库，内核把那些系统调用放到这里面，然后用户程序在启动的时候通过动态链接操作，把这个vdso链到自己的内存空间中来。动态链接保证了vdso每次所在的地址都不一样，所以不太容易被利用，而且可以支持数量较多的系统调用。由于vsyscall的安全性，扩展性等方面的问题，在当代Linux应用中，vDSO已经取代了vsyscall，但是考虑到兼容性，在进程运行地址空间中，vsyscall和vDSO都有映射。
简而言之，vDSO有如下特点：
1.vDSO是一个共享对象，主要用于提供虚拟的“用户空间系统调用”。
2.它被内核映射到所有用户空间进程。
3.它在内和编译期被链接生成。
vdso的编译
make arch/x86/entry/vdso/zlcao@zlcao-RedmiBook-14:~/workspace/linux/linux-5.4.248$ make arch/x86/entry/vdso/
SYSTBL arch/x86/include/generated/asm/syscalls_32.h
SYSHDR arch/x86/include/generated/asm/unistd_32_ia32.h
SYSHDR arch/x86/include/generated/asm/unistd_64_x32.h
SYSTBL arch/x86/include/generated/asm/syscalls_64.h
HYPERCALLS arch/x86/include/generated/asm/xen-hypercalls.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_32.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_64.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_x32.h
HOSTCC arch/x86/tools/relocs_32.o
HOSTCC arch/x86/tools/relocs_64.o
HOSTCC arch/x86/tools/relocs_common.o
HOSTLD arch/x86/tools/relocs
HOSTCC scripts/genksyms/genksyms.o
YACC scripts/genksyms/parse.tab.[ch]
HOSTCC scripts/genksyms/parse.tab.o
LEX scripts/genksyms/lex.lex.c
HOSTCC scripts/genksyms/lex.lex.o
HOSTLD scripts/genksyms/genksyms
HOSTCC scripts/selinux/genheaders/genheaders
HOSTCC scripts/selinux/mdp/mdp
HOSTCC scripts/bin2c
HOSTCC scripts/kallsyms
HOSTCC scripts/conmakehash
HOSTCC scripts/recordmcount
HOSTCC scripts/sortextable
HOSTCC scripts/asn1_compiler
HOSTCC scripts/sign-file
HOSTCC scripts/extract-cert
HOSTCC scripts/insert-sys-cert
WRAP arch/x86/include/generated/uapi/asm/bpf_perf_event.h
WRAP arch/x86/include/generated/uapi/asm/errno.h
WRAP arch/x86/include/generated/uapi/asm/fcntl.h
WRAP arch/x86/include/generated/uapi/asm/ioctl.h
WRAP arch/x86/include/generated/uapi/asm/ioctls.h
WRAP arch/x86/include/generated/uapi/asm/ipcbuf.h
WRAP arch/x86/include/generated/uapi/asm/param.h
WRAP arch/x86/include/generated/uapi/asm/poll.h
WRAP arch/x86/include/generated/uapi/asm/resource.h
WRAP arch/x86/include/generated/uapi/asm/socket.h
WRAP arch/x86/include/generated/uapi/asm/sockios.h
WRAP arch/x86/include/generated/uapi/asm/termbits.h
WRAP arch/x86/include/generated/uapi/asm/termios.h
WRAP arch/x86/include/generated/uapi/asm/types.h
WRAP arch/x86/include/generated/asm/dma-contiguous.h
WRAP arch/x86/include/generated/asm/early_ioremap.h
WRAP arch/x86/include/generated/asm/export.h
WRAP arch/x86/include/generated/asm/mcs_spinlock.h
WRAP arch/x86/include/generated/asm/mm-arch-hooks.h
WRAP arch/x86/include/generated/asm/mmiowb.h
UPD include/config/kernel.release
UPD include/generated/uapi/linux/version.h
UPD include/generated/utsrelease.h
CC scripts/mod/empty.o
HOSTCC scripts/mod/mk_elfconfig
MKELF scripts/mod/elfconfig.h
HOSTCC scripts/mod/modpost.o
CC scripts/mod/devicetable-offsets.s
UPD scripts/mod/devicetable-offsets.h
HOSTCC scripts/mod/file2alias.o
HOSTCC scripts/mod/sumversion.o
HOSTLD scripts/mod/modpost
CC kernel/bounds.s
UPD include/generated/bounds.h
UPD include/generated/timeconst.h
CC arch/x86/kernel/asm-offsets.s
UPD include/generated/asm-offsets.h
CALL scripts/checksyscalls.sh
CALL scripts/atomic/check-atomics.sh
DESCEND objtool
HOSTCC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/fixdep.o
HOSTLD /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/fixdep-in.o
LINK /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/fixdep
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/exec-cmd.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/help.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/pager.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/parse-options.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/run-command.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/sigchain.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/subcmd-config.o
LD /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/libsubcmd-in.o
AR /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/libsubcmd.a
MKDIR /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/arch/x86/lib/
GEN /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/arch/x86/lib/inat-tables.c
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/arch/x86/decode.o
LD /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/arch/x86/objtool-in.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/builtin-check.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/builtin-orc.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/check.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/orc_gen.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/orc_dump.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/elf.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/special.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/objtool.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/libstring.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/libctype.o
CC /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/str_error_r.o
LD /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/objtool-in.o
LINK /home/zlcao/workspace/linux/linux-5.4.248/tools/objtool/objtool
CC arch/x86/entry/vdso/vma.o
CC arch/x86/entry/vdso/vdso32-setup.o
LDS arch/x86/entry/vdso/vdso.lds
AS arch/x86/entry/vdso/vdso-note.o
CC arch/x86/entry/vdso/vclock_gettime.o
CC arch/x86/entry/vdso/vgetcpu.o
VDSO arch/x86/entry/vdso/vdso64.so.dbg
OBJCOPY arch/x86/entry/vdso/vdso64.so
HOSTCC arch/x86/entry/vdso/vdso2c
VDSO2C arch/x86/entry/vdso/vdso-image-64.c
CC arch/x86/entry/vdso/vdso-image-64.o
LDS arch/x86/entry/vdso/vdsox32.lds
X32 arch/x86/entry/vdso/vdso-note-x32.o
X32 arch/x86/entry/vdso/vclock_gettime-x32.o
X32 arch/x86/entry/vdso/vgetcpu-x32.o
VDSO arch/x86/entry/vdso/vdsox32.so.dbg
OBJCOPY arch/x86/entry/vdso/vdsox32.so
VDSO2C arch/x86/entry/vdso/vdso-image-x32.c
CC arch/x86/entry/vdso/vdso-image-x32.o
LDS arch/x86/entry/vdso/vdso32/vdso32.lds
CC arch/x86/entry/vdso/vdso32/vclock_gettime.o
AS arch/x86/entry/vdso/vdso32/note.o
AS arch/x86/entry/vdso/vdso32/system_call.o
AS arch/x86/entry/vdso/vdso32/sigreturn.o
VDSO arch/x86/entry/vdso/vdso32.so.dbg
OBJCOPY arch/x86/entry/vdso/vdso32.so
VDSO2C arch/x86/entry/vdso/vdso-image-32.c
CC arch/x86/entry/vdso/vdso-image-32.o
AR arch/x86/entry/vdso/built-in.avsycall和vDSO机制之间的主要区别在于vDSO以共享对象的形式将内存页映射到每个进程中，但是vsycall在内存中是静态的，并且每次都具有相同的地址。对于x86_64体系结构，vDSO它被称为linux-vdso.so.1。所有用户空间应用程序都会链接到这个共享库，并且映射地址是随机的，例如:
vdso利用 ASLR（address space layout randomization）增强安全性，也就是每次程序运行，vdso的虚拟地址都会变化，有时候为了调试，可以关闭随机地址：
# echo 0 > /proc/sys/kernel/randomize_va_space
# cat /proc/sys/kernel/randomize_va_space
0修改后，地址随机化功能被关闭，之后每次vDSO的加载地址都是一样的了：
vDSO在用户态的地址在高版本的libc中可以直接使用getauxval(AT_SYSINFO_EHDR)来获取:
#include <stdio.h>
#include <stdlib.h>
#include <sys/auxv.h>
int main(void)
{
void *vdso = (void*)getauxval(AT_SYSINFO_EHDR);
printf("%s line %d, vdso = %p.\n", __func__, __LINE__, vdso);
return 0;
}
vdso 在MUSL LIBC中的获取：
如同分析vsyscall的切入点是map_vsyscall函数，分析vDSO机制的实现，从map_vdso函数开始。
首先用ftrace 追踪一下map_vdso的callstack，看它的调用从何处来，到何处去：
root@zlcao-Vostro-3268:/sys/kernel/debug/tracing# echo map_vdso > set_ftrace_filter
root@zlcao-Vostro-3268:/sys/kernel/debug/tracing# echo function > current_tracer
root@zlcao-Vostro-3268:/sys/kernel/debug/tracing# echo 1 > options/func_stack_trace
root@zlcao-Vostro-3268:/sys/kernel/debug/tracing# echo 1 > tracing_on
root@zlcao-Vostro-3268:/sys/kernel/debug/tracing# cat trace
抓取到的callstack如下，可以看到它的调用嵌套在elf可执行程序加载的过程中进行映射的。
=> map_vdso
=> map_vdso_randomized
=> arch_setup_additional_pages
=> load_elf_binary
=> search_binary_handler
=> __do_execve_file.isra.39
=> __x64_sys_execve
=> do_syscall_64
=> entry_SYSCALL_64_after_hwframevDSO文件的构建
当编译内核的时候, 会自动编译并链接vdso的代码. 会生成在ARCH目录：
find arch/x86/ -name '*vdso*.so*' -o -name '*gate*.so*'
vdso文件类型
和普通的用户态运行库一样的格式。
gdb dump vDSO from application
zlcao@zlcao-Vostro-3268:~/Workspace/vdso$ gcc -g -O0 main.c
zlcao@zlcao-Vostro-3268:~/Workspace/vdso$ gdb -q a.out
Reading symbols from a.out...done.
(gdb) b main
Breakpoint 1 at 0x6b2: file main.c, line 7.
(gdb) info program
The program being debugged is not being run.
(gdb) r
Starting program: /home/zlcao/Workspace/vdso/a.out
Breakpoint 1, main () at main.c:7
7 void *vdso = (void*)getauxval(AT_SYSINFO_EHDR);
(gdb) info program
Using the running image of child process 17056.
Program stopped at 0x5555555546b2.
It stopped at breakpoint 1.
Type "info stack" or "info registers" for more information.
(gdb) shell cat /proc/17056/maps|grep vdso
555555554000-555555555000 r-xp 00000000 08:07 3211757 /home/zlcao/Workspace/vdso/a.out
555555754000-555555755000 r--p 00000000 08:07 3211757 /home/zlcao/Workspace/vdso/a.out
555555755000-555555756000 rw-p 00001000 08:07 3211757 /home/zlcao/Workspace/vdso/a.out
7ffff7ffa000-7ffff7ffc000 r-xp 00000000 00:00 0 [vdso]
(gdb) dump binary memory linux-vdso.so 0x7ffff7ffa000 0x7ffff7ffc000
(gdb) c
Continuing.
main line 9, vdso = 0x7ffff7ffa000.
[Inferior 1 (process 17056) exited normally]
(gdb) q
zlcao@zlcao-Vostro-3268:~/Workspace/vdso$ ls
a.out linux-vdso.so main.c
zlcao@zlcao-Vostro-3268:~/Workspace/vdso$ file linux-vdso.so
linux-vdso.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=090da2c26f07da25e1300c29b26b541178fba5f1, stripped
zlcao@zlcao-Vostro-3268:~/Workspace/vdso$ readelf -s linux-vdso.so
Symbol table '.dynsym' contains 12 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000930 409 FUNC WEAK DEFAULT 11 clock_gettime@@LINUX_2.6
2: 0000000000000790 379 FUNC GLOBAL DEFAULT 11 __vdso_gettimeofday@@LINUX_2.6
3: 0000000000000ad0 10 FUNC WEAK DEFAULT 11 clock_getres@@LINUX_2.6
4: 0000000000000ad0 10 FUNC GLOBAL DEFAULT 11 __vdso_clock_getres@@LINUX_2.6
5: 0000000000000790 379 FUNC WEAK DEFAULT 11 gettimeofday@@LINUX_2.6
6: 0000000000000910 21 FUNC GLOBAL DEFAULT 11 __vdso_time@@LINUX_2.6
7: 0000000000000910 21 FUNC WEAK DEFAULT 11 time@@LINUX_2.6
8: 0000000000000930 409 FUNC GLOBAL DEFAULT 11 __vdso_clock_gettime@@LINUX_2.6
9: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS LINUX_2.6
10: 0000000000000ae0 42 FUNC GLOBAL DEFAULT 11 __vdso_getcpu@@LINUX_2.6
11: 0000000000000ae0 42 FUNC WEAK DEFAULT 11 getcpu@@LINUX_2.6
反编译查看函数列表
objdump -d linux-vdso.so | grep -A5 ">:"
objdump -D -b binary -m i386:x86-64 linux-vdso.so | grep syscall -C 2
vDSO使用原则
vDSO principle: Do not enter the kernel if we do not have to because it is costly.
• Libc already helps because it might not do a syscall at all if it can be avoided.
• It takes advantage of the vDSO library or caches information (e.g. getpid()).
• In doing so, the libc adds some complexity to its implementation (e.g. to cache getpid(),
libc has to understand concepts like fork()/clone() so that the caching is correct).
• Since the vDSO library is already there, we could move to a model in which the cached
information is provided via the library in an efficient way.
• This approach would centralize the information, simplify the implementation and
improve the memory utilization (no caching required).
• But extending the vDSO library to encompass new syscalls raises some questions.实现分析
vdso机制需要内核态和用户态的协同动作实现：
实现系统调用有两条路径，如果vDSO存在用户态需要的数据缓存，为了加快处理，则直接读取返回，否则，还需要通过syscall fallback到内核执行，此时有点类似于vsyscall.
一些架构上 vDSO 中虽然实现了系统调用，但背后还是通过真正的系统调用实现，没有起到加速的效果，有些安全性部重要的数据可以不透过系统调用而是缓存获取，但是对于一些核心数据结构，需要fallback到真正的系统调用访问。
vDSO内核代码结构
• Every architecture defines the arch specific hooks in a header in "asm/vdso/".
• The generic implementation includes the arch specific one and lives in "lib/vdso".
• The arch specific code for gettimeofday lives in "<arch path>/vdso/gettimeofday.c" and includes the generic code only.
• The generic implementation of update_vsyscall and update_vsyscall_tz lives in kernel/vdso and provides the bindings that can be
implemented by each architecture.
• Each architecture provides its implementation of the bindings in "asm/vdso/vsyscall.h".
• This approach makes it possible to consolidate the common code in a single place with the benefit of avoiding code duplication.
• CLOCK_BOOTTIME and CLOCK_TAI introduced for all the supported platforms.
vDSO整个运行于用户空间，所以它不依赖内核的头文件。
VDSO的核心实现在arch/x86/entry/vdso目录中，包括系统调用函数实现，连接脚本以及二进制转数组工具代码：
功能接口为vclock_gettime.c，vgetcpu.c，工具代码为vdso2c.c，连接脚本为LDS文件，在Makefile中组织编译，生成linux-vdso.so.1文件：
以get_cpu实现为例，其核心实现并不依赖系统调用指令，因为CPU信息可以通过多种数据结构和渠道得到，所以这里可以避免进行系统调用的开销，相比VSYSCALL机制，性能得到优化。
vdso64_enabled
如同对vsyscall_mode变量的设置，也可以在命令行中增加vsyscall_mode=0的启动项关闭VDSO功能。
如何扩展vDSO系统调用号
vDSO优于vsyscall机制的一大表现是允许用户扩展暴露给用户态的系统调用，在进行这一步之前，按照如下原则考虑如何正确扩展新的系统调用：
Extending the Unified vDSOs to more syscalls raises some questions:
• Which information do we want to make accessible via vDSO?
• Are those private to a process?
• Is there a risk if another process accesses them?
• Exposing private information requires a per process page instead of a global one
• If we keep global vDSO data pages what is the best approach a per-thread one or a percpu one?
• Shall we make the vDSO data pages writable?
• Should the kernel trust a writable vDSO data pages?
• Might expose the kernel to “time of check – time of use” (TOCTOU) attacks.
• Might require to encrypt the datapage in a way that can be decrypted/accessed only by the vDSO
library用户态如何使用
以musl libc为例，介绍系统调用getcpu的VDSO调用,下面是MUSL中src/sched/sched_getcpu.c文件内容：
vdso_func首先初始化为getcpu_init，这样在第一次调用vdso_func时，实际上调用的是getcpu_init，后者根据内核loader的AUX信息获取到VDSO中的符号列表，调用__vdsosym函数得到真实的vdso中的__vdso_getcpu函数地址，并替换vdso_func的值为__vdso_getcpu，后面就可以直接调用vdso_func从VDSO路径中获取了，相反，如果没有实现VDSO，或者LIBC不支持VDSO，则会通过系统调用SYS_getcpu实现功能。
__vdso_getcpu的实现在内核arch/x86/entry/vdso/vgetcpu.c文件中，其在内核中没有地方被调用，调用只能来自于用户态应用，所以是VDSO机制的一级API。
vDSO 系统调用如何注册进内核？
参考getcpu的注册过程，貌似只有两步，第一步实现它，第二步在连接脚本中注册就可以了。
vdso放在文件系统的那里？
VDSO文件放在文件系统/lib/modules/5.4.0-150-generic/vdso目录下.
安装时，需要在linux顶层目录执行
make vdso_install
vDSO中添加函数并验证：
修改如下两个文件即可添加一个新的系统调用到VDSO中。重新编译安装内核和VDSO。
虽然内核目录中编译出了vdso文件，并且我们已经执行make vdso_install执行了安装vdso64/32.so文件到系统目录，但实际上，系统用的并不是安装的这些vdsoxx.so文件，而是用的内核中将vdsoxx.so BINARY转换为二进制数组的形式，链接到内核里面的镜像副本。查看源码arch/x86/entry/vdso/vdso-image-64.c
其大小为8K两个页面，和vdsoXX.so相同，并且vdso64.so文件内容和数组内容是binary identical的。
并且，内核文件中，也能找到raw_data和vdso_image_64两个变量的定义和存储分配：
所以说，外面文件系统中的vdso64.so没有任何作用，仅仅是用来分析和查阅的，真正用的VDSO已经随内核构建在一起了，这也是为什么增加新的接口到VDSO后，必须要重新编译和安装内核，仅仅make install_vdso是不起作用的。
测试kerneladd接口，使用G++编译：
#include<sys/auxv.h>
#include <stdio.h>
#include <string.h>
#include <elf.h>
#include <sys/time.h>
typedef unsigned char u8;
void* vdso_sym(char* symname)
{
auto vdso_addr = (u8*)getauxval(AT_SYSINFO_EHDR);
auto elf_header = (Elf64_Ehdr*)vdso_addr;
auto section_header = (Elf64_Shdr*)(vdso_addr + elf_header->e_shoff);
char* dynstr = 0;
printf("%s line %d, vdso_addr = %p.\n", __func__, __LINE__, vdso_addr);
for (int i=0; i<elf_header->e_shnum; i++) {
auto& s = section_header[i];
auto& ss_ = section_header[elf_header->e_shstrndx];
auto name = (char*)(vdso_addr + ss_.sh_offset + s.sh_name);
if (strcmp(name, ".dynstr") == 0) {
dynstr = (char*)(vdso_addr + s.sh_offset);
break;
}
}
void *ret = NULL;
for (int i=0; i<elf_header->e_shnum; i++) {
auto name = (char*)(vdso_addr + section_header[elf_header->e_shstrndx].sh_offset + section_header[i].sh_name);
if (strcmp(name, ".dynsym") == 0) {
for (int si=0; si<(section_header[i].sh_size/section_header[i].sh_entsize); si++) {
auto name = dynstr + ((Elf64_Sym*)(vdso_addr + section_header[i].sh_offset))[si].st_name;
if (strcmp(name, symname) == 0) {
ret = (vdso_addr + ((Elf64_Sym*)(vdso_addr + section_header[i].sh_offset))[si].st_value);
break;
}
}
if (ret) break;
}
}
return ret;
}
typedef long (*vdso_kerneladd)(long, long);
int main(void)
{
char *funcname = (char*)"__vdso_kerneladd";
auto f = (vdso_kerneladd)vdso_sym(funcname);
printf("kerneladd(7,8) = %ld, kerneladd=%p.\n", f(7,8), f);
return 0;
}
kerneladd函数在VDSO运行空间中的偏移恰好等于在动态库中的符号地址，不知道这个规律是否可以作为一个通用方法方便用户态直接获取访问地址。测试得到正确的计算结果15，我们成功在VDSO中添加了系统调用，并从用户态应用中找到对应的系统调用地址，成功发起调用，函数功能正常。
总结
1.vsyscall是过时的技术，已经被vDSO取代。
2.vsyscall地址固定，有安全隐患，因此后面被VDSO取代，vsyscall只占用一个页面大小，并且只有3个系统调用，每个系统调用地址绝对。功能有限。
3.可以通过内核命令行参数vsyscall="xxx"来设置vsyscall的运行模式。
4.内核地址空间并非铁板一块，可以按照页面力度修改映射属性，使用户空间的程序也可以访问，读写内核地址空间的页面，这并不希奇， melis3.0的设计就是将内核访问权限放开，让应用无论通过系统调用还是function table都可以直接调用，当然用system call的方式更加优雅一些，牺牲一点性能换取设计的优雅。
参考文档：
Linux内核地址空间随机化ASLR的几种实现方法_arm64进程内核栈地_papaofdoudou的博客-CSDN博客
https://blog.linuxplumbersconf.org/2016/ocw/system/presentations/3711/original/LPC_vDSO.pdf
RISC-V Syscall 系列 3：什么是 vDSO？ - 泰晓科技
Linux内核深入理解系统调用（2）：vsyscall 和 vDSO 以及程序是如何运行的（execve）_rtoax的博客-CSDN博客