android中的链接器和vdso映射地址

当我检查android arm64中的进程映射内存区域时，为什么链接器总是映射在vdso的周围，其间没有空白？我只知道vdso是由辅助向量中的AT_SYSINFO_EHDR决定的

walleye:/ # cat /proc/23630/maps                                             
5555555000-5557c6c000 r-xp 00000000 103:1d 8195                          /data/local/tmp/frida-server
5557c6c000-5557c80000 rw-p 02716000 103:1d 8195                          /data/local/tmp/frida-server
5557c80000-5557c84000 rw-p 00000000 00:00 0                              [heap]
7fb7e91000-7fb7e92000 r--p 00000000 00:00 0                              [vvar]
7fb7e92000-7fb7e93000 r-xp 00000000 00:00 0                              [vdso]
7fb7e93000-7fb7f87000 r-xp 00000000 fc:00 2362                           /system/bin/linker64
7fb7f88000-7fb7f8d000 rw-p 000f4000 fc:00 2362                           /system/bin/linker64
7fb7f8d000-7fb8001000 rw-p 00000000 00:00 0 
7ffffdf000-8000000000 rw-p 00000000 00:00 0                              [stack]


walleye:/ # cat /proc/23664/maps
5555555000-55555b2000 r-xp 00000000 fc:00 2404                           /system/bin/toybox
55555b2000-55555b7000 rw-p 0005c000 fc:00 2404                           /system/bin/toybox
55555b7000-55555bb000 rw-p 00000000 00:00 0                              [heap]
7fb7e91000-7fb7e92000 r--p 00000000 00:00 0                              [vvar]
7fb7e92000-7fb7e93000 r-xp 00000000 00:00 0                              [vdso]
7fb7e93000-7fb7f87000 r-xp 00000000 fc:00 2362                           /system/bin/linker64
7fb7f88000-7fb7f8d000 rw-p 000f4000 fc:00 2362                           /system/bin/linker64
7fb7f8d000-7fb8001000 rw-p 00000000 00:00 0 
7ffffdf000-8000000000 rw-p 00000000 00:00 0                              [stack]